/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.88 Revision 1.232
1/* 1/*
2 * Copyright 2003-2005 Gentoo Foundation 2 * Copyright 2003-2007 Gentoo Foundation
3 * Distributed under the terms of the GNU General Public License v2 3 * Distributed under the terms of the GNU General Public License v2
4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.88 2005/09/30 03:30:54 vapier Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.232 2011/09/27 22:20:07 vapier Exp $
5 * 5 *
6 * Copyright 2003-2005 Ned Ludd - <solar@gentoo.org> 6 * Copyright 2003-2007 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2005 Mike Frysinger - <vapier@gentoo.org> 7 * Copyright 2004-2007 Mike Frysinger - <vapier@gentoo.org>
8 */ 8 */
9 9
10#include <stdio.h> 10static const char rcsid[] = "$Id: scanelf.c,v 1.232 2011/09/27 22:20:07 vapier Exp $";
11#include <stdlib.h> 11const char argv0[] = "scanelf";
12#include <sys/types.h> 12
13#include <libgen.h>
14#include <limits.h>
15#define __USE_GNU
16#include <string.h>
17#include <errno.h>
18#include <unistd.h>
19#include <sys/stat.h>
20#include <dirent.h>
21#include <getopt.h>
22#include <assert.h>
23#include "paxelf.h" 13#include "paxinc.h"
24 14
25static const char *rcsid = "$Id: scanelf.c,v 1.88 2005/09/30 03:30:54 vapier Exp $";
26#define argv0 "scanelf"
27
28#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
29
30
31 16
32/* prototypes */ 17/* prototypes */
33static void scanelf_file(const char *filename); 18static int file_matches_list(const char *filename, char **matchlist);
34static void scanelf_dir(const char *path);
35static void scanelf_ldpath();
36static void scanelf_envpath();
37static void usage(int status);
38static void parseargs(int argc, char *argv[]);
39static char *xstrdup(const char *s);
40static void *xmalloc(size_t size);
41static void xstrcat(char **dst, const char *src, size_t *curr_len);
42static inline void xchrcat(char **dst, const char append, size_t *curr_len);
43 19
44/* variables to control behavior */ 20/* variables to control behavior */
45static char *ldpaths[256]; 21static char *match_etypes = NULL;
22static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
46static char scan_ldpath = 0; 23static char scan_ldpath = 0;
47static char scan_envpath = 0; 24static char scan_envpath = 0;
48static char scan_symlink = 1; 25static char scan_symlink = 1;
26static char scan_archives = 0;
49static char dir_recurse = 0; 27static char dir_recurse = 0;
50static char dir_crossmount = 1; 28static char dir_crossmount = 1;
51static char show_pax = 0; 29static char show_pax = 0;
30static char show_perms = 0;
31static char show_size = 0;
52static char show_phdr = 0; 32static char show_phdr = 0;
53static char show_textrel = 0; 33static char show_textrel = 0;
54static char show_rpath = 0; 34static char show_rpath = 0;
55static char show_needed = 0; 35static char show_needed = 0;
56static char show_interp = 0; 36static char show_interp = 0;
57static char show_bind = 0; 37static char show_bind = 0;
58static char show_soname = 0; 38static char show_soname = 0;
59static char show_textrels = 0; 39static char show_textrels = 0;
60static char show_banner = 1; 40static char show_banner = 1;
41static char show_endian = 0;
42static char show_osabi = 0;
43static char show_eabi = 0;
61static char be_quiet = 0; 44static char be_quiet = 0;
62static char be_verbose = 0; 45static char be_verbose = 0;
63static char be_wewy_wewy_quiet = 0; 46static char be_wewy_wewy_quiet = 0;
64static char *find_sym = NULL, *versioned_symname = NULL; 47static char be_semi_verbose = 0;
48static char *find_sym = NULL;
65static char *find_lib = NULL; 49static char *find_lib = NULL;
50static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
51static char *find_section = NULL;
52static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
66static char *out_format = NULL; 53static char *out_format = NULL;
67static char *search_path = NULL; 54static char *search_path = NULL;
55static char fix_elf = 0;
68static char gmatch = 0; 56static char g_match = 0;
57static char use_ldcache = 0;
69 58
59static char **qa_textrels = NULL;
60static char **qa_execstack = NULL;
61static char **qa_wx_load = NULL;
62static int root_fd = AT_FDCWD;
70 63
64static int match_bits = 0;
65static unsigned int match_perms = 0;
66static void *ldcache = NULL;
67static size_t ldcache_size = 0;
68static unsigned long setpax = 0UL;
69
70static int has_objdump = 0;
71
72/* find the path to a file by name */
73static int bin_in_path(const char *fname)
74{
75 char fullpath[__PAX_UTILS_PATH_MAX];
76 char *path, *p;
77
78 path = getenv("PATH");
79 if (!path)
80 return 0;
81
82 while ((p = strrchr(path, ':')) != NULL) {
83 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
84 *p = 0;
85 if (access(fullpath, R_OK) != -1)
86 return 1;
87 }
88
89 return 0;
90}
91
92static FILE *fopenat_r(int dir_fd, const char *path)
93{
94 int fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
95 if (fd == -1)
96 return NULL;
97 return fdopen(fd, "re");
98}
99
100static const char *root_rel_path(const char *path)
101{
102 /*
103 * openat() will ignore the dirfd if path starts with
104 * a /, so consume all of that noise
105 *
106 * XXX: we don't handle relative paths like ../ that
107 * break out of the --root option, but for now, just
108 * don't do that :P.
109 */
110 if (root_fd != AT_FDCWD) {
111 while (*path == '/')
112 ++path;
113 if (*path == '\0')
114 path = ".";
115 }
116
117 return path;
118}
119
120/* 1 on failure. 0 otherwise */
121static int rematch(const char *regex, const char *match, int cflags)
122{
123 regex_t preg;
124 int ret;
125
126 if ((match == NULL) || (regex == NULL))
127 return EXIT_FAILURE;
128
129 if ((ret = regcomp(&preg, regex, cflags))) {
130 char err[256];
131
132 if (regerror(ret, &preg, err, sizeof(err)))
133 fprintf(stderr, "regcomp failed: %s", err);
134 else
135 fprintf(stderr, "regcomp failed");
136
137 return EXIT_FAILURE;
138 }
139 ret = regexec(&preg, match, 0, NULL, 0);
140 regfree(&preg);
141
142 return ret;
143}
144
71/* sub-funcs for scanelf_file() */ 145/* sub-funcs for scanelf_fileat() */
72static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 146static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
73{ 147{
74 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 148 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
149
150 /* debug sections */
151 void *symtab = elf_findsecbyname(elf, ".symtab");
152 void *strtab = elf_findsecbyname(elf, ".strtab");
153 /* runtime sections */
154 void *dynsym = elf_findsecbyname(elf, ".dynsym");
155 void *dynstr = elf_findsecbyname(elf, ".dynstr");
156
75#define GET_SYMTABS(B) \ 157#define GET_SYMTABS(B) \
76 if (elf->elf_class == ELFCLASS ## B) { \ 158 if (elf->elf_class == ELFCLASS ## B) { \
77 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
78 /* debug sections */ \
79 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
80 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
81 /* runtime sections */ \
82 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
83 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
84 if (symtab && dynsym) { \ 159 if (symtab && dynsym) { \
160 Elf ## B ## _Shdr *esymtab = symtab; \
161 Elf ## B ## _Shdr *edynsym = dynsym; \
85 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 162 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
86 } else { \ 163 } else \
87 *sym = (void*)(symtab ? symtab : dynsym); \ 164 *sym = symtab ? symtab : dynsym; \
88 } \
89 if (strtab && dynstr) { \ 165 if (strtab && dynstr) { \
166 Elf ## B ## _Shdr *estrtab = strtab; \
167 Elf ## B ## _Shdr *edynstr = dynstr; \
90 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ 168 *tab = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
91 } else { \ 169 } else \
92 *tab = (void*)(strtab ? strtab : dynstr); \ 170 *tab = strtab ? strtab : dynstr; \
93 } \
94 } 171 }
95 GET_SYMTABS(32) 172 GET_SYMTABS(32)
96 GET_SYMTABS(64) 173 GET_SYMTABS(64)
97} 174}
175
98static char *scanelf_file_pax(elfobj *elf, char *found_pax) 176static char *scanelf_file_pax(elfobj *elf, char *found_pax)
99{ 177{
100 static char *paxflags;
101 static char ret[7]; 178 static char ret[7];
102 unsigned long i, shown; 179 unsigned long i, shown;
103 180
104 if (!show_pax) return NULL; 181 if (!show_pax) return NULL;
105 182
112 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 189 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
113 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 190 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
114 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 191 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
115 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 192 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
116 continue; \ 193 continue; \
117 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 194 if (fix_elf && setpax) { \
195 /* set the paxctl flags */ \
196 ESET(phdr[i].p_flags, setpax); \
197 } \
198 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
118 continue; \ 199 continue; \
119 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 200 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
120 *found_pax = 1; \ 201 *found_pax = 1; \
121 ++shown; \ 202 ++shown; \
122 break; \ 203 break; \
124 } 205 }
125 SHOW_PAX(32) 206 SHOW_PAX(32)
126 SHOW_PAX(64) 207 SHOW_PAX(64)
127 } 208 }
128 209
210 if (fix_elf && setpax) {
211 /* set the chpax settings */
212 if (elf->elf_class == ELFCLASS32) {
213 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
214 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
215 } else {
216 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
217 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
218 }
219 }
220
129 /* fall back to EI_PAX if no PT_PAX was found */ 221 /* fall back to EI_PAX if no PT_PAX was found */
130 if (!*ret) { 222 if (!*ret) {
223 static char *paxflags;
131 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 224 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
132 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) { 225 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
133 *found_pax = 1; 226 *found_pax = 1;
134 return paxflags; 227 return (be_wewy_wewy_quiet ? NULL : paxflags);
135 } 228 }
136 strncpy(ret, paxflags, sizeof(ret)); 229 strncpy(ret, paxflags, sizeof(ret));
137 } 230 }
138 231
139 if (be_quiet && !shown) 232 if (be_wewy_wewy_quiet || (be_quiet && !shown))
140 return NULL; 233 return NULL;
234 else
141 return ret; 235 return ret;
142
143} 236}
237
144static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 238static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
145{ 239{
146 static char ret[12]; 240 static char ret[12];
147 char *found; 241 char *found;
148 unsigned long i, off, shown, check_flags;
149 unsigned char multi_stack, multi_relro, multi_load; 242 unsigned long i, shown, multi_stack, multi_relro, multi_load;
243 int max_pt_load;
150 244
151 if (!show_phdr) return NULL; 245 if (!show_phdr) return NULL;
152 246
153 memcpy(ret, "--- --- ---\0", 12); 247 memcpy(ret, "--- --- ---\0", 12);
154 248
155 shown = 0; 249 shown = 0;
156 multi_stack = multi_relro = multi_load = 0; 250 multi_stack = multi_relro = multi_load = 0;
251 max_pt_load = elf_max_pt_load(elf);
157 252
158 if (elf->phdr) { 253#define NOTE_GNU_STACK ".note.GNU-stack"
159#define SHOW_PHDR(B) \ 254#define SHOW_PHDR(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \ 255 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 256 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
257 Elf ## B ## _Off offset; \
258 uint32_t flags, check_flags; \
259 if (elf->phdr != NULL) { \
162 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 260 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
163 uint32_t flags; \
164 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 261 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
165 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 262 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
263 if (multi_stack++) \
166 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 264 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
265 if (file_matches_list(elf->filename, qa_execstack)) \
266 continue; \
167 found = found_phdr; \ 267 found = found_phdr; \
168 off = 0; \ 268 offset = 0; \
169 check_flags = PF_X; \ 269 check_flags = PF_X; \
170 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 270 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
271 if (multi_relro++) \
171 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 272 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
172 found = found_relro; \ 273 found = found_relro; \
173 off = 4; \ 274 offset = 4; \
174 check_flags = PF_X; \ 275 check_flags = PF_X; \
175 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 276 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
176 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 277 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
278 if (multi_load++ > max_pt_load) \
279 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
280 if (file_matches_list(elf->filename, qa_wx_load)) \
281 continue; \
177 found = found_load; \ 282 found = found_load; \
178 off = 8; \ 283 offset = 8; \
179 check_flags = PF_W|PF_X; \ 284 check_flags = PF_W|PF_X; \
180 } else \ 285 } else \
181 continue; \ 286 continue; \
182 flags = EGET(phdr[i].p_flags); \ 287 flags = EGET(phdr[i].p_flags); \
183 if (be_quiet && ((flags & check_flags) != check_flags)) \ 288 if (be_quiet && ((flags & check_flags) != check_flags)) \
184 continue; \ 289 continue; \
290 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
291 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
292 ret[3] = ret[7] = '!'; \
293 flags = EGET(phdr[i].p_flags); \
294 } \
185 memcpy(ret+off, gnu_short_stack_flags(flags), 3); \ 295 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
186 *found = 1; \ 296 *found = 1; \
187 ++shown; \ 297 ++shown; \
298 } \
299 } else if (elf->shdr != NULL) { \
300 /* no program headers which means this is prob an object file */ \
301 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
302 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
303 char *str; \
304 if ((void*)strtbl > elf->data_end) \
305 goto skip_this_shdr##B; \
306 check_flags = SHF_WRITE|SHF_EXECINSTR; \
307 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
308 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
309 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
310 str = elf->data + offset; \
311 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
312 if (!strcmp(str, NOTE_GNU_STACK)) { \
313 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
314 flags = EGET(shdr[i].sh_flags); \
315 if (be_quiet && ((flags & check_flags) != check_flags)) \
316 continue; \
317 ++*found_phdr; \
318 shown = 1; \
319 if (flags & SHF_WRITE) ret[0] = 'W'; \
320 if (flags & SHF_ALLOC) ret[1] = 'A'; \
321 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
322 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
323 break; \
324 } \
325 } \
326 skip_this_shdr##B: \
327 if (!multi_stack) { \
328 if (file_matches_list(elf->filename, qa_execstack)) \
329 return NULL; \
330 *found_phdr = 1; \
331 shown = 1; \
332 memcpy(ret, "!WX", 3); \
333 } \
188 } \ 334 } \
189 } 335 }
190 SHOW_PHDR(32) 336 SHOW_PHDR(32)
191 SHOW_PHDR(64) 337 SHOW_PHDR(64)
192 }
193 338
194 if (be_quiet && !shown) 339 if (be_wewy_wewy_quiet || (be_quiet && !shown))
195 return NULL; 340 return NULL;
196 else 341 else
197 return ret; 342 return ret;
198} 343}
344
345/*
346 * See if this ELF contains a DT_TEXTREL tag in any of its
347 * PT_DYNAMIC sections.
348 */
199static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 349static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
200{ 350{
201 static char ret[] = "TEXTREL"; 351 static const char *ret = "TEXTREL";
202 unsigned long i; 352 unsigned long i;
203 353
204 if (!show_textrel && !show_textrels) return NULL; 354 if (!show_textrel && !show_textrels) return NULL;
355
356 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
205 357
206 if (elf->phdr) { 358 if (elf->phdr) {
207#define SHOW_TEXTREL(B) \ 359#define SHOW_TEXTREL(B) \
208 if (elf->elf_class == ELFCLASS ## B) { \ 360 if (elf->elf_class == ELFCLASS ## B) { \
209 Elf ## B ## _Dyn *dyn; \ 361 Elf ## B ## _Dyn *dyn; \
210 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 362 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
211 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 363 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
212 Elf ## B ## _Off offset; \ 364 Elf ## B ## _Off offset; \
213 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 365 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
214 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 366 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
215 offset = EGET(phdr[i].p_offset); \ 367 offset = EGET(phdr[i].p_offset); \
216 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 368 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
217 dyn = DYN ## B (elf->data + offset); \ 369 dyn = DYN ## B (elf->vdata + offset); \
218 while (EGET(dyn->d_tag) != DT_NULL) { \ 370 while (EGET(dyn->d_tag) != DT_NULL) { \
219 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 371 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
220 *found_textrel = 1; \ 372 *found_textrel = 1; \
221 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 373 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
222 return (be_wewy_wewy_quiet ? NULL : ret); \ 374 return (be_wewy_wewy_quiet ? NULL : ret); \
229 } 381 }
230 382
231 if (be_quiet || be_wewy_wewy_quiet) 383 if (be_quiet || be_wewy_wewy_quiet)
232 return NULL; 384 return NULL;
233 else 385 else
234 return (char *)" - "; 386 return " - ";
235} 387}
388
389/*
390 * Scan the .text section to see if there are any relocations in it.
391 * Should rewrite this to check PT_LOAD sections that are marked
392 * Executable rather than the section named '.text'.
393 */
236static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 394static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
237{ 395{
238 unsigned long s, r, rmax; 396 unsigned long s, r, rmax;
239 void *symtab_void, *strtab_void, *text_void; 397 void *symtab_void, *strtab_void, *text_void;
240 398
261 Elf ## B ## _Rela *rela; \ 419 Elf ## B ## _Rela *rela; \
262 /* search the section headers for relocations */ \ 420 /* search the section headers for relocations */ \
263 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 421 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
264 uint32_t sh_type = EGET(shdr[s].sh_type); \ 422 uint32_t sh_type = EGET(shdr[s].sh_type); \
265 if (sh_type == SHT_REL) { \ 423 if (sh_type == SHT_REL) { \
266 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 424 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
267 rela = NULL; \ 425 rela = NULL; \
268 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 426 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
269 } else if (sh_type == SHT_RELA) { \ 427 } else if (sh_type == SHT_RELA) { \
270 rel = NULL; \ 428 rel = NULL; \
271 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 429 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
272 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 430 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
273 } else \ 431 } else \
274 continue; \ 432 continue; \
275 /* now see if any of the relocs are in the .text */ \ 433 /* now see if any of the relocs are in the .text */ \
276 for (r = 0; r < rmax; ++r) { \ 434 for (r = 0; r < rmax; ++r) { \
291 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 449 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
292 if (be_verbose <= 2) continue; \ 450 if (be_verbose <= 2) continue; \
293 } else \ 451 } else \
294 *found_textrels = 1; \ 452 *found_textrels = 1; \
295 /* locate this relocation symbol name */ \ 453 /* locate this relocation symbol name */ \
296 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 454 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
455 if ((void*)sym > elf->data_end) { \
456 warn("%s: corrupt ELF symbol", elf->filename); \
457 continue; \
458 } \
297 sym_max = ELF ## B ## _R_SYM(r_info); \ 459 sym_max = ELF ## B ## _R_SYM(r_info); \
298 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 460 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
299 sym += sym_max; \ 461 sym += sym_max; \
300 else \ 462 else \
301 sym = NULL; \ 463 sym = NULL; \
302 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 464 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
303 /* show the raw details about this reloc */ \ 465 /* show the raw details about this reloc */ \
304 printf(" %s: ", elf->base_filename); \ 466 printf(" %s: ", elf->base_filename); \
305 if (sym && sym->st_name) \ 467 if (sym && sym->st_name) \
306 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 468 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
307 else \ 469 else \
308 printf("(memory/fake?)"); \ 470 printf("(memory/data?)"); \
309 printf(" [0x%lX]", (unsigned long)r_offset); \ 471 printf(" [0x%lX]", (unsigned long)r_offset); \
310 /* now try to find the closest symbol that this rel is probably in */ \ 472 /* now try to find the closest symbol that this rel is probably in */ \
311 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 473 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
312 func = NULL; \ 474 func = NULL; \
313 offset_tmp = 0; \ 475 offset_tmp = 0; \
314 while (sym_max--) { \ 476 while (sym_max--) { \
315 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 477 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
316 func = sym; \ 478 func = sym; \
317 offset_tmp = EGET(sym->st_value); \ 479 offset_tmp = EGET(sym->st_value); \
318 } \ 480 } \
319 ++sym; \ 481 ++sym; \
320 } \ 482 } \
321 printf(" in "); \ 483 printf(" in "); \
322 if (func && func->st_name) \ 484 if (func && func->st_name) { \
323 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 485 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
486 if (r_offset > EGET(func->st_size)) \
487 printf("(optimized out: previous %s)", func_name); \
324 else \ 488 else \
325 printf("(NULL: fake?)"); \ 489 printf("%s", func_name); \
490 } else \
491 printf("(optimized out)"); \
326 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 492 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
493 if (be_verbose && has_objdump) { \
494 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
495 char *sysbuf; \
496 size_t syslen; \
497 const char sysfmt[] = "objdump -r -R -d -w -l --start-address=0x%lX --stop-address=0x%lX %s | grep --color -i -C 3 '.*[[:space:]]%lX:[[:space:]]*R_.*'\n"; \
498 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
499 sysbuf = xmalloc(syslen); \
500 if (end_addr < r_offset) \
501 /* not uncommon when things are optimized out */ \
502 end_addr = r_offset + 0x100; \
503 snprintf(sysbuf, syslen, sysfmt, \
504 (unsigned long)offset_tmp, \
505 (unsigned long)end_addr, \
506 elf->filename, \
507 (unsigned long)r_offset); \
508 fflush(stdout); \
509 if (system(sysbuf)) /* don't care */; \
510 fflush(stdout); \
511 free(sysbuf); \
512 } \
327 } \ 513 } \
328 } } 514 } }
329 SHOW_TEXTRELS(32) 515 SHOW_TEXTRELS(32)
330 SHOW_TEXTRELS(64) 516 SHOW_TEXTRELS(64)
331 } 517 }
333 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 519 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
334 520
335 return NULL; 521 return NULL;
336} 522}
337 523
338static void rpath_security_checks(elfobj *, char *);
339static void rpath_security_checks(elfobj *elf, char *item) { 524static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
525{
340 struct stat st; 526 struct stat st;
341 switch (*item) { 527 switch (*item) {
528 case '/': break;
342 case 0: 529 case '.':
343 warnf("Security problem NULL RPATH in %s", elf->filename); 530 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
344 break; 531 break;
345 case '/': break; 532 case ':':
533 case '\0':
534 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
535 break;
346 case '$': 536 case '$':
347 if (fstat(elf->fd, &st) != -1) 537 if (fstat(elf->fd, &st) != -1)
348 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 538 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
349 warnf("Security problem with RPATH='%s' in %s with mode set of %o", 539 warnf("Security problem with %s='%s' in %s with mode set of %o",
350 item, elf->filename, st.st_mode & 07777); 540 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
351 break; 541 break;
352 default: 542 default:
353 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); 543 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
354 break; 544 break;
355 } 545 }
356} 546}
357static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 547static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
358{ 548{
359 unsigned long i, s; 549 unsigned long i;
360 char *rpath, *runpath, **r; 550 char *rpath, *runpath, **r;
361 void *strtbl_void; 551 void *strtbl_void;
362 552
363 if (!show_rpath) return; 553 if (!show_rpath) return;
364 554
375 Elf ## B ## _Off offset; \ 565 Elf ## B ## _Off offset; \
376 Elf ## B ## _Xword word; \ 566 Elf ## B ## _Xword word; \
377 /* Scan all the program headers */ \ 567 /* Scan all the program headers */ \
378 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 568 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
379 /* Just scan dynamic headers */ \ 569 /* Just scan dynamic headers */ \
380 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 570 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
381 offset = EGET(phdr[i].p_offset); \ 571 offset = EGET(phdr[i].p_offset); \
382 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 572 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
383 /* Just scan dynamic RPATH/RUNPATH headers */ \ 573 /* Just scan dynamic RPATH/RUNPATH headers */ \
384 dyn = DYN ## B (elf->data + offset); \ 574 dyn = DYN ## B (elf->vdata + offset); \
385 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 575 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
386 if (word == DT_RPATH) { \ 576 if (word == DT_RPATH) { \
387 r = &rpath; \ 577 r = &rpath; \
388 } else if (word == DT_RUNPATH) { \ 578 } else if (word == DT_RUNPATH) { \
389 r = &runpath; \ 579 r = &runpath; \
393 } \ 583 } \
394 /* Verify the memory is somewhat sane */ \ 584 /* Verify the memory is somewhat sane */ \
395 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 585 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
396 if (offset < (Elf ## B ## _Off)elf->len) { \ 586 if (offset < (Elf ## B ## _Off)elf->len) { \
397 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 587 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
398 *r = (char*)(elf->data + offset); \ 588 *r = elf->data + offset; \
589 /* cache the length in case we need to nuke this section later on */ \
590 if (fix_elf) \
591 offset = strlen(*r); \
399 /* If quiet, don't output paths in ld.so.conf */ \ 592 /* If quiet, don't output paths in ld.so.conf */ \
400 if (be_quiet) { \ 593 if (be_quiet) { \
401 size_t len; \ 594 size_t len; \
402 char *start, *end; \ 595 char *start, *end; \
403 /* note that we only 'chop' off leading known paths. */ \ 596 /* note that we only 'chop' off leading known paths. */ \
404 /* since *r is read-only memory, we can only move the ptr forward. */ \ 597 /* since *r is read-only memory, we can only move the ptr forward. */ \
405 start = *r; \ 598 start = *r; \
406 /* scan each path in : delimited list */ \ 599 /* scan each path in : delimited list */ \
407 while (start) { \ 600 while (start) { \
408 rpath_security_checks(elf, start); \ 601 rpath_security_checks(elf, start, get_elfdtype(word)); \
409 end = strchr(start, ':'); \ 602 end = strchr(start, ':'); \
410 len = (end ? abs(end - start) : strlen(start)); \ 603 len = (end ? abs(end - start) : strlen(start)); \
411 for (s = 0; ldpaths[s]; ++s) { \ 604 if (use_ldcache) { \
605 size_t n; \
606 const char *ldpath; \
607 array_for_each(ldpaths, n, ldpath) \
412 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 608 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
413 *r = (end ? end + 1 : NULL); \ 609 *r = end; \
610 /* corner case ... if RPATH reads "/usr/lib:", we want \
611 * to show ':' rather than '' */ \
612 if (end && end[1] != '\0') \
613 (*r)++; \
414 break; \ 614 break; \
415 } \ 615 } \
416 } \ 616 } \
417 if (!*r || !ldpaths[s] || !end) \ 617 if (!*r || !end) \
418 start = NULL; \ 618 break; \
419 else \ 619 else \
420 start = start + len + 1; \ 620 start = start + len + 1; \
421 } \ 621 } \
422 } \ 622 } \
623 if (*r) { \
624 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
625 /* just nuke it */ \
626 nuke_it##B: \
627 memset(*r, 0x00, offset); \
628 *r = NULL; \
629 ESET(dyn->d_tag, DT_DEBUG); \
630 ESET(dyn->d_un.d_ptr, 0); \
631 } else if (fix_elf) { \
632 /* try to clean "bad" paths */ \
633 size_t len, tmpdir_len; \
634 char *start, *end; \
635 const char *tmpdir; \
636 start = *r; \
637 tmpdir = (getenv("TMPDIR") ? : "."); \
638 tmpdir_len = strlen(tmpdir); \
639 while (1) { \
640 end = strchr(start, ':'); \
641 if (start == end) { \
642 eat_this_path##B: \
643 len = strlen(end); \
644 memmove(start, end+1, len); \
645 start[len-1] = '\0'; \
646 end = start - 1; \
647 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
648 if (!end) { \
649 if (start == *r) \
650 goto nuke_it##B; \
651 *--start = '\0'; \
652 } else \
653 goto eat_this_path##B; \
654 } \
655 if (!end) \
656 break; \
657 start = end + 1; \
658 } \
659 if (**r == '\0') \
660 goto nuke_it##B; \
661 } \
662 if (*r) \
423 if (*r) *found_rpath = 1; \ 663 *found_rpath = 1; \
664 } \
424 } \ 665 } \
425 ++dyn; \ 666 ++dyn; \
426 } \ 667 } \
427 } } 668 } }
428 SHOW_RPATH(32) 669 SHOW_RPATH(32)
445 } else if (rpath || runpath) 686 } else if (rpath || runpath)
446 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 687 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
447 else if (!be_quiet) 688 else if (!be_quiet)
448 xstrcat(ret, " - ", ret_len); 689 xstrcat(ret, " - ", ret_len);
449} 690}
691
692#define LDSO_CACHE_MAGIC "ld.so-"
693#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
694#define LDSO_CACHE_VER "1.7.0"
695#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
696#define FLAG_ANY -1
697#define FLAG_TYPE_MASK 0x00ff
698#define FLAG_LIBC4 0x0000
699#define FLAG_ELF 0x0001
700#define FLAG_ELF_LIBC5 0x0002
701#define FLAG_ELF_LIBC6 0x0003
702#define FLAG_REQUIRED_MASK 0xff00
703#define FLAG_SPARC_LIB64 0x0100
704#define FLAG_IA64_LIB64 0x0200
705#define FLAG_X8664_LIB64 0x0300
706#define FLAG_S390_LIB64 0x0400
707#define FLAG_POWERPC_LIB64 0x0500
708#define FLAG_MIPS64_LIBN32 0x0600
709#define FLAG_MIPS64_LIBN64 0x0700
710
711#if defined(__GLIBC__) || defined(__UCLIBC__)
712
713static char *lookup_cache_lib(elfobj *elf, char *fname)
714{
715 int fd;
716 char *strs;
717 static char buf[__PAX_UTILS_PATH_MAX] = "";
718 const char *cachefile = root_rel_path("/etc/ld.so.cache");
719 struct stat st;
720
721 typedef struct {
722 char magic[LDSO_CACHE_MAGIC_LEN];
723 char version[LDSO_CACHE_VER_LEN];
724 int nlibs;
725 } header_t;
726 header_t *header;
727
728 typedef struct {
729 int flags;
730 int sooffset;
731 int liboffset;
732 } libentry_t;
733 libentry_t *libent;
734
735 if (fname == NULL)
736 return NULL;
737
738 if (ldcache == NULL) {
739 if (fstatat(root_fd, cachefile, &st, 0))
740 return NULL;
741
742 fd = openat(root_fd, cachefile, O_RDONLY);
743 if (fd == -1)
744 return NULL;
745
746 /* cache these values so we only map/unmap the cache file once */
747 ldcache_size = st.st_size;
748 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
749 close(fd);
750
751 if (ldcache == MAP_FAILED) {
752 ldcache = NULL;
753 return NULL;
754 }
755
756 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
757 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
758 {
759 munmap(ldcache, ldcache_size);
760 ldcache = NULL;
761 return NULL;
762 }
763 } else
764 header = ldcache;
765
766 libent = ldcache + sizeof(header_t);
767 strs = (char *) &libent[header->nlibs];
768
769 for (fd = 0; fd < header->nlibs; ++fd) {
770 /* This should be more fine grained, but for now we assume that
771 * diff arches will not be cached together, and we ignore the
772 * the different multilib mips cases.
773 */
774 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
775 continue;
776 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
777 continue;
778
779 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
780 continue;
781
782 /* Return first hit because that is how the ldso rolls */
783 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
784 break;
785 }
786
787 return buf;
788}
789
790#elif defined(__NetBSD__)
791static char *lookup_cache_lib(elfobj *elf, char *fname)
792{
793 static char buf[__PAX_UTILS_PATH_MAX] = "";
794 static struct stat st;
795 size_t n;
796 char *ldpath;
797
798 array_for_each(ldpath, n, ldpath) {
799 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
800 continue; /* if the pathname is too long, or something went wrong, ignore */
801
802 if (stat(buf, &st) != 0)
803 continue; /* if the lib doesn't exist in *ldpath, look further */
804
805 /* NetBSD doesn't actually do sanity checks, it just loads the file
806 * and if that doesn't work, continues looking in other directories.
807 * This cannot easily be safely emulated, unfortunately. For now,
808 * just assume that if it exists, it's a valid library. */
809
810 return buf;
811 }
812
813 /* not found in any path */
814 return NULL;
815}
816#else
817#ifdef __ELF__
818#warning Cache support not implemented for your target
819#endif
820static char *lookup_cache_lib(elfobj *elf, char *fname)
821{
822 return NULL;
823}
824#endif
825
450static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 826static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
451{ 827{
452 unsigned long i; 828 unsigned long i;
453 char *needed; 829 char *needed;
454 void *strtbl_void; 830 void *strtbl_void;
831 char *p;
455 832
833 /*
834 * -n -> op==0 -> print all
835 * -N -> op==1 -> print requested
836 */
456 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 837 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
838 return NULL;
457 839
458 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 840 strtbl_void = elf_findsecbyname(elf, ".dynstr");
459 841
460 if (elf->phdr && strtbl_void) { 842 if (elf->phdr && strtbl_void) {
461#define SHOW_NEEDED(B) \ 843#define SHOW_NEEDED(B) \
463 Elf ## B ## _Dyn *dyn; \ 845 Elf ## B ## _Dyn *dyn; \
464 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 846 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
465 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 847 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
466 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 848 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
467 Elf ## B ## _Off offset; \ 849 Elf ## B ## _Off offset; \
850 size_t matched = 0; \
851 /* Walk all the program headers to find the PT_DYNAMIC */ \
468 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 852 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
469 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 853 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
854 continue; \
470 offset = EGET(phdr[i].p_offset); \ 855 offset = EGET(phdr[i].p_offset); \
471 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 856 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
857 continue; \
858 /* Walk all the dynamic tags to find NEEDED entries */ \
472 dyn = DYN ## B (elf->data + offset); \ 859 dyn = DYN ## B (elf->vdata + offset); \
473 while (EGET(dyn->d_tag) != DT_NULL) { \ 860 while (EGET(dyn->d_tag) != DT_NULL) { \
474 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 861 if (EGET(dyn->d_tag) == DT_NEEDED) { \
475 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 862 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
476 if (offset >= (Elf ## B ## _Off)elf->len) { \ 863 if (offset >= (Elf ## B ## _Off)elf->len) { \
477 ++dyn; \ 864 ++dyn; \
478 continue; \ 865 continue; \
479 } \ 866 } \
480 needed = (char*)(elf->data + offset); \ 867 needed = elf->data + offset; \
481 if (op == 0) { \ 868 if (op == 0) { \
869 /* -n -> print all entries */ \
482 if (!be_wewy_wewy_quiet) { \ 870 if (!be_wewy_wewy_quiet) { \
483 if (*found_needed) xchrcat(ret, ',', ret_len); \ 871 if (*found_needed) xchrcat(ret, ',', ret_len); \
872 if (use_ldcache) \
873 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
874 needed = p; \
484 xstrcat(ret, needed, ret_len); \ 875 xstrcat(ret, needed, ret_len); \
485 } \ 876 } \
486 *found_needed = 1; \ 877 *found_needed = 1; \
487 } else { \ 878 } else { \
488 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 879 /* -N -> print matching entries */ \
880 size_t n; \
881 const char *find_lib_name; \
882 \
883 array_for_each(find_lib_arr, n, find_lib_name) \
884 if (!strcmp(find_lib_name, needed)) \
885 ++matched; \
886 \
887 if (matched == array_cnt(find_lib_arr)) { \
489 *found_lib = 1; \ 888 *found_lib = 1; \
490 return (be_wewy_wewy_quiet ? NULL : needed); \ 889 return (be_wewy_wewy_quiet ? NULL : find_lib); \
491 } \ 890 } \
492 } \ 891 } \
493 } \ 892 } \
494 ++dyn; \ 893 ++dyn; \
495 } \ 894 } \
524} 923}
525static char *scanelf_file_bind(elfobj *elf, char *found_bind) 924static char *scanelf_file_bind(elfobj *elf, char *found_bind)
526{ 925{
527 unsigned long i; 926 unsigned long i;
528 struct stat s; 927 struct stat s;
928 char dynamic = 0;
529 929
530 if (!show_bind) return NULL; 930 if (!show_bind) return NULL;
531 if (!elf->phdr) return NULL; 931 if (!elf->phdr) return NULL;
532 932
533#define SHOW_BIND(B) \ 933#define SHOW_BIND(B) \
535 Elf ## B ## _Dyn *dyn; \ 935 Elf ## B ## _Dyn *dyn; \
536 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 936 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
537 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 937 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
538 Elf ## B ## _Off offset; \ 938 Elf ## B ## _Off offset; \
539 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 939 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
540 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 940 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
941 dynamic = 1; \
541 offset = EGET(phdr[i].p_offset); \ 942 offset = EGET(phdr[i].p_offset); \
542 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 943 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
543 dyn = DYN ## B (elf->data + offset); \ 944 dyn = DYN ## B (elf->vdata + offset); \
544 while (EGET(dyn->d_tag) != DT_NULL) { \ 945 while (EGET(dyn->d_tag) != DT_NULL) { \
545 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 946 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
546 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 947 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
547 { \ 948 { \
548 if (be_quiet) return NULL; \ 949 if (be_quiet) return NULL; \
556 SHOW_BIND(32) 957 SHOW_BIND(32)
557 SHOW_BIND(64) 958 SHOW_BIND(64)
558 959
559 if (be_wewy_wewy_quiet) return NULL; 960 if (be_wewy_wewy_quiet) return NULL;
560 961
962 /* don't output anything if quiet mode and the ELF is static or not setuid */
561 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { 963 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
562 return NULL; 964 return NULL;
563 } else { 965 } else {
564 *found_bind = 1; 966 *found_bind = 1;
565 return (char *) "LAZY"; 967 return (char *)(dynamic ? "LAZY" : "STATIC");
566 } 968 }
567} 969}
568static char *scanelf_file_soname(elfobj *elf, char *found_soname) 970static char *scanelf_file_soname(elfobj *elf, char *found_soname)
569{ 971{
570 unsigned long i; 972 unsigned long i;
582 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 984 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
583 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 985 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
584 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 986 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
585 Elf ## B ## _Off offset; \ 987 Elf ## B ## _Off offset; \
586 /* only look for soname in shared objects */ \ 988 /* only look for soname in shared objects */ \
587 if (ehdr->e_type != ET_DYN) \ 989 if (EGET(ehdr->e_type) != ET_DYN) \
588 return NULL; \ 990 return NULL; \
589 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 991 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
590 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 992 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
591 offset = EGET(phdr[i].p_offset); \ 993 offset = EGET(phdr[i].p_offset); \
592 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 994 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
593 dyn = DYN ## B (elf->data + offset); \ 995 dyn = DYN ## B (elf->vdata + offset); \
594 while (EGET(dyn->d_tag) != DT_NULL) { \ 996 while (EGET(dyn->d_tag) != DT_NULL) { \
595 if (EGET(dyn->d_tag) == DT_SONAME) { \ 997 if (EGET(dyn->d_tag) == DT_SONAME) { \
596 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 998 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
597 if (offset >= (Elf ## B ## _Off)elf->len) { \ 999 if (offset >= (Elf ## B ## _Off)elf->len) { \
598 ++dyn; \ 1000 ++dyn; \
599 continue; \ 1001 continue; \
600 } \ 1002 } \
601 soname = (char*)(elf->data + offset); \ 1003 soname = elf->data + offset; \
602 *found_soname = 1; \ 1004 *found_soname = 1; \
603 return (be_wewy_wewy_quiet ? NULL : soname); \ 1005 return (be_wewy_wewy_quiet ? NULL : soname); \
604 } \ 1006 } \
605 ++dyn; \ 1007 ++dyn; \
606 } \ 1008 } \
609 SHOW_SONAME(64) 1011 SHOW_SONAME(64)
610 } 1012 }
611 1013
612 return NULL; 1014 return NULL;
613} 1015}
1016
1017/*
1018 * We support the symbol form:
1019 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1020 * If the symbol name is empty, then all symbols are matched.
1021 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1022 * Do not rely on this output format at all.
1023 * Otherwise the symbol name is used to search (either regex or string compare).
1024 * If the first char of the symbol name is a plus ("+"), then only match
1025 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1026 * Putting modifiers in between the percent signs allows for more in depth
1027 * filters. There are groups of modifiers. If you don't specify a member
1028 * of a group, then all types in that group are matched. The current
1029 * groups and their types are:
1030 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f SST_FILE:F
1031 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1032 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1033 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1034 * You can search for multiple symbols at once by seperating with a comma (",").
1035 *
1036 * Some examples:
1037 * ELFs with a weak function "foo":
1038 * scanelf -s %wf%foo <ELFs>
1039 * ELFs that define the symbol "main":
1040 * scanelf -s +main <ELFs>
1041 * scanelf -s %d%main <ELFs>
1042 * ELFs that refer to the undefined symbol "brk":
1043 * scanelf -s -brk <ELFs>
1044 * scanelf -s %u%brk <ELFs>
1045 * All global defined objects in an ELF:
1046 * scanelf -s %ogd% <ELF>
1047 */
1048static void
1049scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1050 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1051{
1052 char *this_sym, *next_sym, saved = saved;
1053
1054 /* allow the user to specify a comma delimited list of symbols to search for */
1055 next_sym = NULL;
1056 do {
1057 bool inc_notype, inc_object, inc_func, inc_file,
1058 inc_local, inc_global, inc_weak,
1059 inc_def, inc_undef, inc_abs, inc_common;
1060
1061 if (next_sym) {
1062 next_sym[-1] = saved;
1063 this_sym = next_sym;
1064 } else
1065 this_sym = find_sym;
1066 if ((next_sym = strchr(this_sym, ','))) {
1067 /* make parsing easier by killing the comma temporarily */
1068 saved = *next_sym;
1069 *next_sym = '\0';
1070 next_sym += 1;
1071 }
1072
1073 /* symbol selection! */
1074 inc_notype = inc_object = inc_func = inc_file = \
1075 inc_local = inc_global = inc_weak = \
1076 inc_def = inc_undef = inc_abs = inc_common = \
1077 (*this_sym != '%');
1078
1079 /* parse the contents of %...% */
1080 if (!inc_notype) {
1081 while (*(this_sym++)) {
1082 if (*this_sym == '%') {
1083 ++this_sym;
1084 break;
1085 }
1086 switch (*this_sym) {
1087 case 'n': inc_notype = true; break;
1088 case 'o': inc_object = true; break;
1089 case 'f': inc_func = true; break;
1090 case 'F': inc_file = true; break;
1091 case 'l': inc_local = true; break;
1092 case 'g': inc_global = true; break;
1093 case 'w': inc_weak = true; break;
1094 case 'd': inc_def = true; break;
1095 case 'u': inc_undef = true; break;
1096 case 'a': inc_abs = true; break;
1097 case 'c': inc_common = true; break;
1098 default: err("invalid symbol selector '%c'", *this_sym);
1099 }
1100 }
1101
1102 /* If no types are matched, not match all */
1103 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1104 inc_notype = inc_object = inc_func = inc_file = true;
1105 if (!inc_local && !inc_global && !inc_weak)
1106 inc_local = inc_global = inc_weak = true;
1107 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1108 inc_def = inc_undef = inc_abs = inc_common = true;
1109
1110 /* backwards compat for defined/undefined short hand */
1111 } else if (*this_sym == '+') {
1112 inc_undef = false;
1113 ++this_sym;
1114 } else if (*this_sym == '-') {
1115 inc_def = inc_abs = inc_common = false;
1116 ++this_sym;
1117 }
1118
1119 /* filter symbols */
1120 if ((!inc_notype && stt == STT_NOTYPE) || \
1121 (!inc_object && stt == STT_OBJECT) || \
1122 (!inc_func && stt == STT_FUNC ) || \
1123 (!inc_file && stt == STT_FILE ) || \
1124 (!inc_local && stb == STB_LOCAL ) || \
1125 (!inc_global && stb == STB_GLOBAL) || \
1126 (!inc_weak && stb == STB_WEAK ) || \
1127 (!inc_def && shn && shn < SHN_LORESERVE) || \
1128 (!inc_undef && shn == SHN_UNDEF ) || \
1129 (!inc_abs && shn == SHN_ABS ) || \
1130 (!inc_common && shn == SHN_COMMON))
1131 continue;
1132
1133 if (*this_sym == '*') {
1134 /* a "*" symbol gets you debug output */
1135 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1136 ((*found_sym == 0) ? "\n\t" : "\t"),
1137 elf->base_filename,
1138 size,
1139 get_elfstttype(stt),
1140 get_elfstbtype(stb),
1141 get_elfshntype(shn),
1142 symname);
1143 goto matched;
1144
1145 } else {
1146 if (g_match) {
1147 /* regex match the symbol */
1148 if (rematch(this_sym, symname, REG_EXTENDED) != 0)
1149 continue;
1150
1151 } else if (*this_sym) {
1152 /* give empty symbols a "pass", else do a normal compare */
1153 const size_t len = strlen(this_sym);
1154 if (!(strncmp(this_sym, symname, len) == 0 &&
1155 /* Accept unversioned symbol names */
1156 (symname[len] == '\0' || symname[len] == '@')))
1157 continue;
1158 }
1159
1160 if (be_semi_verbose) {
1161 char buf[1024];
1162 snprintf(buf, sizeof(buf), "%lX %s %s",
1163 size,
1164 get_elfstttype(stt),
1165 this_sym);
1166 *ret = xstrdup(buf);
1167 } else {
1168 if (*ret) xchrcat(ret, ',', ret_len);
1169 xstrcat(ret, symname, ret_len);
1170 }
1171
1172 goto matched;
1173 }
1174 } while (next_sym);
1175
1176 return;
1177
1178 matched:
1179 *found_sym = 1;
1180 if (next_sym)
1181 next_sym[-1] = saved;
1182}
1183
614static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1184static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
615{ 1185{
616 unsigned long i; 1186 unsigned long i;
1187 char *ret;
617 void *symtab_void, *strtab_void; 1188 void *symtab_void, *strtab_void;
618 1189
619 if (!find_sym) return NULL; 1190 if (!find_sym) return NULL;
1191 ret = NULL;
620 1192
621 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1193 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
622 1194
623 if (symtab_void && strtab_void) { 1195 if (symtab_void && strtab_void) {
624#define FIND_SYM(B) \ 1196#define FIND_SYM(B) \
625 if (elf->elf_class == ELFCLASS ## B) { \ 1197 if (elf->elf_class == ELFCLASS ## B) { \
626 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1198 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
627 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1199 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
628 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1200 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
629 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1201 unsigned long cnt = EGET(symtab->sh_entsize); \
630 char *symname; \ 1202 char *symname; \
1203 size_t ret_len = 0; \
1204 if (cnt) \
1205 cnt = EGET(symtab->sh_size) / cnt; \
631 for (i = 0; i < cnt; ++i) { \ 1206 for (i = 0; i < cnt; ++i) { \
1207 if ((void*)sym > elf->data_end) { \
1208 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1209 goto break_out; \
1210 } \
632 if (sym->st_name) { \ 1211 if (sym->st_name) { \
1212 /* make sure the symbol name is in acceptable memory range */ \
633 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1213 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
634 if (*find_sym == '*') { \ 1214 if ((void*)symname > elf->data_end) { \
635 printf("%s(%s) %5lX %15s %s\n", \ 1215 warnf("%s: corrupt ELF symbols", elf->filename); \
636 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1216 ++sym; \
637 elf->base_filename, \ 1217 continue; \
638 (long)sym->st_size, \ 1218 } \
639 (char *)get_elfstttype(sym->st_info), \ 1219 scanelf_match_symname(elf, found_sym, \
640 symname); \ 1220 &ret, &ret_len, symname, \
641 *found_sym = 1; \ 1221 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
642 } else if ((strcmp(find_sym, symname) == 0) || \ 1222 ELF##B##_ST_BIND(EGET(sym->st_info)), \
643 (strcmp(symname, versioned_symname) == 0)) \ 1223 EGET(sym->st_shndx), \
644 (*found_sym)++; \ 1224 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1225 EGET(sym->st_size)); \
645 } \ 1226 } \
646 ++sym; \ 1227 ++sym; \
647 } } 1228 } }
648 FIND_SYM(32) 1229 FIND_SYM(32)
649 FIND_SYM(64) 1230 FIND_SYM(64)
650 } 1231 }
651 1232
1233break_out:
652 if (be_wewy_wewy_quiet) return NULL; 1234 if (be_wewy_wewy_quiet) return NULL;
653 1235
654 if (*find_sym != '*' && *found_sym) 1236 if (*find_sym != '*' && *found_sym)
655 return find_sym; 1237 return ret;
656 if (be_quiet) 1238 if (be_quiet)
657 return NULL; 1239 return NULL;
658 else 1240 else
659 return (char *)" - "; 1241 return " - ";
660} 1242}
1243
1244static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1245{
1246 if (!find_section)
1247 return NULL;
1248
1249#define FIND_SECTION(B) \
1250 if (elf->elf_class == ELFCLASS ## B) { \
1251 size_t matched, n; \
1252 int invert; \
1253 const char *section_name; \
1254 Elf ## B ## _Shdr *section; \
1255 \
1256 matched = 0; \
1257 array_for_each(find_section_arr, n, section_name) { \
1258 invert = (*section_name == '!' ? 1 : 0); \
1259 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1260 if ((section == NULL && invert) || (section != NULL && !invert)) \
1261 ++matched; \
1262 } \
1263 \
1264 if (matched == array_cnt(find_section_arr)) \
1265 *found_section = 1; \
1266 }
1267 FIND_SECTION(32)
1268 FIND_SECTION(64)
1269
1270 if (be_wewy_wewy_quiet)
1271 return NULL;
1272
1273 if (*found_section)
1274 return find_section;
1275
1276 if (be_quiet)
1277 return NULL;
1278 else
1279 return " - ";
1280}
1281
661/* scan an elf file and show all the fun stuff */ 1282/* scan an elf file and show all the fun stuff */
662#define prints(str) write(fileno(stdout), str, strlen(str)) 1283#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
663static void scanelf_file(const char *filename) 1284static int scanelf_elfobj(elfobj *elf)
664{ 1285{
665 unsigned long i; 1286 unsigned long i;
666 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1287 char found_pax, found_phdr, found_relro, found_load, found_textrel,
667 found_rpath, found_needed, found_interp, found_bind, found_soname, 1288 found_rpath, found_needed, found_interp, found_bind, found_soname,
668 found_sym, found_lib, found_file, found_textrels; 1289 found_sym, found_lib, found_file, found_textrels, found_section;
669 elfobj *elf;
670 struct stat st;
671 static char *out_buffer = NULL; 1290 static char *out_buffer = NULL;
672 static size_t out_len; 1291 static size_t out_len;
673 1292
674 /* make sure 'filename' exists */
675 if (lstat(filename, &st) == -1) {
676 if (be_verbose > 2) printf("%s: does not exist\n", filename);
677 return;
678 }
679 /* always handle regular files and handle symlinked files if no -y */
680 if (S_ISLNK(st.st_mode)) {
681 if (!scan_symlink) return;
682 stat(filename, &st);
683 }
684 if (!S_ISREG(st.st_mode)) {
685 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
686 return;
687 }
688
689 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1293 found_pax = found_phdr = found_relro = found_load = found_textrel = \
690 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1294 found_rpath = found_needed = found_interp = found_bind = found_soname = \
691 found_sym = found_lib = found_file = found_textrels = 0; 1295 found_sym = found_lib = found_file = found_textrels = found_section = 0;
692 1296
693 /* verify this is real ELF */
694 if ((elf = readelf(filename)) == NULL) {
695 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
696 return;
697 }
698
699 if (be_verbose > 1) 1297 if (be_verbose > 2)
700 printf("%s: scanning file {%s,%s}\n", filename, 1298 printf("%s: scanning file {%s,%s}\n", elf->filename,
701 get_elfeitype(EI_CLASS, elf->elf_class), 1299 get_elfeitype(EI_CLASS, elf->elf_class),
702 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1300 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
703 else if (be_verbose) 1301 else if (be_verbose > 1)
704 printf("%s: scanning file\n", filename); 1302 printf("%s: scanning file\n", elf->filename);
705 1303
706 /* init output buffer */ 1304 /* init output buffer */
707 if (!out_buffer) { 1305 if (!out_buffer) {
708 out_len = sizeof(char) * 80; 1306 out_len = sizeof(char) * 80;
709 out_buffer = (char*)xmalloc(out_len); 1307 out_buffer = xmalloc(out_len);
710 } 1308 }
711 *out_buffer = '\0'; 1309 *out_buffer = '\0';
712 1310
713 /* show the header */ 1311 /* show the header */
714 if (!be_quiet && show_banner) { 1312 if (!be_quiet && show_banner) {
715 for (i = 0; out_format[i]; ++i) { 1313 for (i = 0; out_format[i]; ++i) {
716 if (!IS_MODIFIER(out_format[i])) continue; 1314 if (!IS_MODIFIER(out_format[i])) continue;
717 1315
718 switch (out_format[++i]) { 1316 switch (out_format[++i]) {
1317 case '+': break;
719 case '%': break; 1318 case '%': break;
720 case '#': break; 1319 case '#': break;
721 case 'F': 1320 case 'F':
722 case 'p': 1321 case 'p':
723 case 'f': prints("FILE "); found_file = 1; break; 1322 case 'f': prints("FILE "); found_file = 1; break;
724 case 'o': prints(" TYPE "); break; 1323 case 'o': prints(" TYPE "); break;
725 case 'x': prints(" PAX "); break; 1324 case 'x': prints(" PAX "); break;
726 case 'e': prints("STK/REL/PTL "); break; 1325 case 'e': prints("STK/REL/PTL "); break;
727 case 't': prints("TEXTREL "); break; 1326 case 't': prints("TEXTREL "); break;
728 case 'r': prints("RPATH "); break; 1327 case 'r': prints("RPATH "); break;
1328 case 'M': prints("CLASS "); break;
729 case 'n': prints("NEEDED "); break; 1329 case 'n': prints("NEEDED "); break;
730 case 'i': prints("INTERP "); break; 1330 case 'i': prints("INTERP "); break;
731 case 'b': prints("BIND "); break; 1331 case 'b': prints("BIND "); break;
1332 case 'Z': prints("SIZE "); break;
732 case 'S': prints("SONAME "); break; 1333 case 'S': prints("SONAME "); break;
733 case 's': prints("SYM "); break; 1334 case 's': prints("SYM "); break;
734 case 'N': prints("LIB "); break; 1335 case 'N': prints("LIB "); break;
735 case 'T': prints("TEXTRELS "); break; 1336 case 'T': prints("TEXTRELS "); break;
1337 case 'k': prints("SECTION "); break;
1338 case 'a': prints("ARCH "); break;
1339 case 'I': prints("OSABI "); break;
1340 case 'Y': prints("EABI "); break;
1341 case 'O': prints("PERM "); break;
1342 case 'D': prints("ENDIAN "); break;
736 default: warnf("'%c' has no title ?", out_format[i]); 1343 default: warnf("'%c' has no title ?", out_format[i]);
737 } 1344 }
738 } 1345 }
739 if (!found_file) prints("FILE "); 1346 if (!found_file) prints("FILE ");
740 prints("\n"); 1347 prints("\n");
744 1351
745 /* dump all the good stuff */ 1352 /* dump all the good stuff */
746 for (i = 0; out_format[i]; ++i) { 1353 for (i = 0; out_format[i]; ++i) {
747 const char *out; 1354 const char *out;
748 const char *tmp; 1355 const char *tmp;
749 1356 static char ubuf[sizeof(unsigned long)*2];
750 /* make sure we trim leading spaces in quiet mode */
751 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
752 *out_buffer = '\0';
753
754 if (!IS_MODIFIER(out_format[i])) { 1357 if (!IS_MODIFIER(out_format[i])) {
755 xchrcat(&out_buffer, out_format[i], &out_len); 1358 xchrcat(&out_buffer, out_format[i], &out_len);
756 continue; 1359 continue;
757 } 1360 }
758 1361
759 out = NULL; 1362 out = NULL;
760 be_wewy_wewy_quiet = (out_format[i] == '#'); 1363 be_wewy_wewy_quiet = (out_format[i] == '#');
1364 be_semi_verbose = (out_format[i] == '+');
761 switch (out_format[++i]) { 1365 switch (out_format[++i]) {
1366 case '+':
762 case '%': 1367 case '%':
763 case '#': 1368 case '#':
764 xchrcat(&out_buffer, out_format[i], &out_len); break; 1369 xchrcat(&out_buffer, out_format[i], &out_len); break;
765 case 'F': 1370 case 'F':
766 found_file = 1; 1371 found_file = 1;
767 if (be_wewy_wewy_quiet) break; 1372 if (be_wewy_wewy_quiet) break;
768 xstrcat(&out_buffer, filename, &out_len); 1373 xstrcat(&out_buffer, elf->filename, &out_len);
769 break; 1374 break;
770 case 'p': 1375 case 'p':
771 found_file = 1; 1376 found_file = 1;
772 if (be_wewy_wewy_quiet) break; 1377 if (be_wewy_wewy_quiet) break;
773 tmp = filename; 1378 tmp = elf->filename;
774 if (search_path) { 1379 if (search_path) {
775 ssize_t len_search = strlen(search_path); 1380 ssize_t len_search = strlen(search_path);
776 ssize_t len_file = strlen(filename); 1381 ssize_t len_file = strlen(elf->filename);
777 if (!strncmp(filename, search_path, len_search) && \ 1382 if (!strncmp(elf->filename, search_path, len_search) && \
778 len_file > len_search) 1383 len_file > len_search)
779 tmp += len_search; 1384 tmp += len_search;
780 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1385 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
781 } 1386 }
782 xstrcat(&out_buffer, tmp, &out_len); 1387 xstrcat(&out_buffer, tmp, &out_len);
783 break; 1388 break;
784 case 'f': 1389 case 'f':
785 found_file = 1; 1390 found_file = 1;
786 if (be_wewy_wewy_quiet) break; 1391 if (be_wewy_wewy_quiet) break;
787 tmp = strrchr(filename, '/'); 1392 tmp = strrchr(elf->filename, '/');
788 tmp = (tmp == NULL ? filename : tmp+1); 1393 tmp = (tmp == NULL ? elf->filename : tmp+1);
789 xstrcat(&out_buffer, tmp, &out_len); 1394 xstrcat(&out_buffer, tmp, &out_len);
790 break; 1395 break;
791 case 'o': out = get_elfetype(elf); break; 1396 case 'o': out = get_elfetype(elf); break;
792 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1397 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
793 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break; 1398 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
794 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1399 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
795 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1400 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
796 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1401 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1402 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1403 case 'D': out = get_endian(elf); break;
1404 case 'O': out = strfileperms(elf->filename); break;
797 case 'n': 1405 case 'n':
798 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1406 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
799 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1407 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
800 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1408 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
801 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1409 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
802 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1410 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1411 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1412 case 'a': out = get_elfemtype(elf); break;
1413 case 'I': out = get_elfosabi(elf); break;
1414 case 'Y': out = get_elf_eabi(elf); break;
1415 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
803 default: warnf("'%c' has no scan code?", out_format[i]); 1416 default: warnf("'%c' has no scan code?", out_format[i]);
804 } 1417 }
1418 if (out)
805 if (out) xstrcat(&out_buffer, out, &out_len); 1419 xstrcat(&out_buffer, out, &out_len);
806 } 1420 }
807 1421
808#define FOUND_SOMETHING() \ 1422#define FOUND_SOMETHING() \
809 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1423 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
810 found_rpath || found_needed || found_interp || found_bind || \ 1424 found_rpath || found_needed || found_interp || found_bind || \
811 found_soname || found_sym || found_lib || found_textrels) 1425 found_soname || found_sym || found_lib || found_textrels || found_section )
812 1426
813 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1427 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
814 xchrcat(&out_buffer, ' ', &out_len); 1428 xchrcat(&out_buffer, ' ', &out_len);
815 xstrcat(&out_buffer, filename, &out_len); 1429 xstrcat(&out_buffer, elf->filename, &out_len);
816 } 1430 }
817 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1431 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
818 puts(out_buffer); 1432 puts(out_buffer);
819 fflush(stdout); 1433 fflush(stdout);
820 } 1434 }
821 1435
1436 return 0;
1437}
1438
1439/* scan a single elf */
1440static int scanelf_elf(const char *filename, int fd, size_t len)
1441{
1442 int ret = 1;
1443 elfobj *elf;
1444
1445 /* verify this is real ELF */
1446 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1447 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1448 return ret;
1449 }
1450 switch (match_bits) {
1451 case 32:
1452 if (elf->elf_class != ELFCLASS32)
1453 goto label_done;
1454 break;
1455 case 64:
1456 if (elf->elf_class != ELFCLASS64)
1457 goto label_done;
1458 break;
1459 default: break;
1460 }
1461 if (match_etypes) {
1462 char sbuf[126];
1463 strncpy(sbuf, match_etypes, sizeof(sbuf));
1464 if (strchr(match_etypes, ',') != NULL) {
1465 char *p;
1466 while ((p = strrchr(sbuf, ',')) != NULL) {
1467 *p = 0;
1468 if (etype_lookup(p+1) == get_etype(elf))
1469 goto label_ret;
1470 }
1471 }
1472 if (etype_lookup(sbuf) != get_etype(elf))
1473 goto label_done;
1474 }
1475
1476label_ret:
1477 ret = scanelf_elfobj(elf);
1478
1479label_done:
822 unreadelf(elf); 1480 unreadelf(elf);
1481 return ret;
1482}
1483
1484/* scan an archive of elfs */
1485static int scanelf_archive(const char *filename, int fd, size_t len)
1486{
1487 archive_handle *ar;
1488 archive_member *m;
1489 char *ar_buffer;
1490 elfobj *elf;
1491
1492 ar = ar_open_fd(filename, fd);
1493 if (ar == NULL)
1494 return 1;
1495
1496 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1497 while ((m = ar_next(ar)) != NULL) {
1498 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1499 if (cur_pos == -1)
1500 errp("lseek() failed");
1501 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1502 if (elf) {
1503 scanelf_elfobj(elf);
1504 unreadelf(elf);
1505 }
1506 }
1507 munmap(ar_buffer, len);
1508
1509 return 0;
1510}
1511/* scan a file which may be an elf or an archive or some other magical beast */
1512static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1513{
1514 const struct stat *st = st_cache;
1515 struct stat symlink_st;
1516 int fd;
1517
1518 /* always handle regular files and handle symlinked files if no -y */
1519 if (S_ISLNK(st->st_mode)) {
1520 if (!scan_symlink)
1521 return 1;
1522 fstatat(dir_fd, filename, &symlink_st, 0);
1523 st = &symlink_st;
1524 }
1525
1526 if (!S_ISREG(st->st_mode)) {
1527 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1528 return 1;
1529 }
1530
1531 if (match_perms) {
1532 if ((st->st_mode | match_perms) != st->st_mode)
1533 return 1;
1534 }
1535 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1536 if (fd == -1)
1537 return 1;
1538
1539 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1540 /* if it isn't an ELF, maybe it's an .a archive */
1541 scanelf_archive(filename, fd, st->st_size);
1542
1543 /* XXX: unreadelf() implicitly closes its fd */
1544 close(fd);
1545 return 0;
823} 1546}
824 1547
825/* scan a directory for ET_EXEC files and print when we find one */ 1548/* scan a directory for ET_EXEC files and print when we find one */
826static void scanelf_dir(const char *path) 1549static int scanelf_dirat(int dir_fd, const char *path)
827{ 1550{
828 register DIR *dir; 1551 register DIR *dir;
829 register struct dirent *dentry; 1552 register struct dirent *dentry;
830 struct stat st_top, st; 1553 struct stat st_top, st;
831 char buf[_POSIX_PATH_MAX]; 1554 char buf[__PAX_UTILS_PATH_MAX], *subpath;
832 size_t pathlen = 0, len = 0; 1555 size_t pathlen = 0, len = 0;
1556 int ret = 0;
1557 int subdir_fd;
833 1558
834 /* make sure path exists */ 1559 /* make sure path exists */
835 if (lstat(path, &st_top) == -1) { 1560 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
836 if (be_verbose > 2) printf("%s: does not exist\n", path); 1561 if (be_verbose > 2) printf("%s: does not exist\n", path);
837 return; 1562 return 1;
838 } 1563 }
839 1564
840 /* ok, if it isn't a directory, assume we can open it */ 1565 /* ok, if it isn't a directory, assume we can open it */
841 if (!S_ISDIR(st_top.st_mode)) { 1566 if (!S_ISDIR(st_top.st_mode))
842 scanelf_file(path); 1567 return scanelf_fileat(dir_fd, path, &st_top);
843 return;
844 }
845 1568
846 /* now scan the dir looking for fun stuff */ 1569 /* now scan the dir looking for fun stuff */
847 if ((dir = opendir(path)) == NULL) { 1570 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1571 if (subdir_fd == -1)
1572 dir = NULL;
1573 else
1574 dir = fdopendir(subdir_fd);
1575 if (dir == NULL) {
1576 if (subdir_fd != -1)
1577 close(subdir_fd);
848 warnf("could not opendir %s: %s", path, strerror(errno)); 1578 warnf("could not opendir %s: %s", path, strerror(errno));
849 return; 1579 return 1;
850 } 1580 }
851 if (be_verbose) printf("%s: scanning dir\n", path); 1581 if (be_verbose > 1) printf("%s: scanning dir\n", path);
852 1582
853 pathlen = strlen(path); 1583 subpath = stpcpy(buf, path);
1584 *subpath++ = '/';
1585 pathlen = subpath - buf;
854 while ((dentry = readdir(dir))) { 1586 while ((dentry = readdir(dir))) {
855 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1587 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
856 continue; 1588 continue;
857 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1589
858 if (len >= sizeof(buf)) { 1590 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
859 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
860 (unsigned long)len, (unsigned long)sizeof(buf));
861 continue; 1591 continue;
1592
1593 len = strlen(dentry->d_name);
1594 if (len + pathlen + 1 >= sizeof(buf)) {
1595 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1596 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1597 continue;
862 } 1598 }
863 sprintf(buf, "%s/%s", path, dentry->d_name); 1599 memcpy(subpath, dentry->d_name, len);
864 if (lstat(buf, &st) != -1) { 1600 subpath[len] = '\0';
1601
865 if (S_ISREG(st.st_mode)) 1602 if (S_ISREG(st.st_mode))
866 scanelf_file(buf); 1603 ret = scanelf_fileat(dir_fd, buf, &st);
867 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1604 else if (dir_recurse && S_ISDIR(st.st_mode)) {
868 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1605 if (dir_crossmount || (st_top.st_dev == st.st_dev))
869 scanelf_dir(buf); 1606 ret = scanelf_dirat(dir_fd, buf);
870 }
871 } 1607 }
872 } 1608 }
873 closedir(dir); 1609 closedir(dir);
874}
875 1610
1611 return ret;
1612}
1613static int scanelf_dir(const char *path)
1614{
1615 return scanelf_dirat(root_fd, root_rel_path(path));
1616}
1617
876static int scanelf_from_file(char *filename) 1618static int scanelf_from_file(const char *filename)
877{ 1619{
878 FILE *fp = NULL; 1620 FILE *fp;
879 char *p; 1621 char *p, *path;
880 char path[_POSIX_PATH_MAX]; 1622 size_t len;
1623 int ret;
881 1624
882 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1625 if (strcmp(filename, "-") == 0)
883 fp = stdin; 1626 fp = stdin;
884 else if ((fp = fopen(filename, "r")) == NULL) 1627 else if ((fp = fopen(filename, "r")) == NULL)
885 return 1; 1628 return 1;
886 1629
887 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1630 path = NULL;
1631 len = 0;
1632 ret = 0;
1633 while (getline(&path, &len, fp) != -1) {
888 if ((p = strchr(path, '\n')) != NULL) 1634 if ((p = strchr(path, '\n')) != NULL)
889 *p = 0; 1635 *p = 0;
890 search_path = path; 1636 search_path = path;
891 scanelf_dir(path); 1637 ret = scanelf_dir(path);
892 } 1638 }
1639 free(path);
1640
893 if (fp != stdin) 1641 if (fp != stdin)
894 fclose(fp); 1642 fclose(fp);
1643
895 return 0; 1644 return ret;
896} 1645}
897 1646
898static void load_ld_so_conf() 1647#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1648
1649static int load_ld_cache_config(int i, const char *fname)
899{ 1650{
900 FILE *fp = NULL; 1651 FILE *fp = NULL;
901 char *p; 1652 char *p, *path;
902 char path[_POSIX_PATH_MAX]; 1653 size_t len;
903 int i = 0; 1654 int curr_fd = -1;
904 1655
905 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1656 fp = fopenat_r(root_fd, root_rel_path(fname));
1657 if (fp == NULL)
906 return; 1658 return i;
907 1659
908 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1660 path = NULL;
909 if (*path != '/') 1661 len = 0;
910 continue; 1662 while (getline(&path, &len, fp) != -1) {
911
912 if ((p = strrchr(path, '\r')) != NULL) 1663 if ((p = strrchr(path, '\r')) != NULL)
913 *p = 0; 1664 *p = 0;
914 if ((p = strchr(path, '\n')) != NULL) 1665 if ((p = strchr(path, '\n')) != NULL)
915 *p = 0; 1666 *p = 0;
916 1667
917 ldpaths[i++] = xstrdup(path); 1668 /* recursive includes of the same file will make this segfault. */
1669 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1670 glob_t gl;
1671 size_t x;
1672 const char *gpath;
918 1673
919 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1674 /* re-use existing path buffer ... need to be creative */
920 break; 1675 if (path[8] != '/')
1676 gpath = memcpy(path + 3, "/etc/", 5);
1677 else
1678 gpath = path + 8;
1679 if (root_fd != AT_FDCWD) {
1680 if (curr_fd == -1) {
1681 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1682 if (fchdir(root_fd))
1683 errp("unable to change to root dir");
1684 }
1685 gpath = root_rel_path(gpath);
1686 }
1687
1688 if (glob(gpath, 0, NULL, &gl) == 0) {
1689 for (x = 0; x < gl.gl_pathc; ++x) {
1690 /* try to avoid direct loops */
1691 if (strcmp(gl.gl_pathv[x], fname) == 0)
1692 continue;
1693 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1694 }
1695 globfree(&gl);
1696 }
1697
1698 /* failed globs are ignored by glibc */
1699 continue;
921 } 1700 }
922 ldpaths[i] = NULL; 1701
1702 if (*path != '/')
1703 continue;
1704
1705 xarraypush(ldpaths, path, strlen(path));
1706 }
1707 free(path);
923 1708
924 fclose(fp); 1709 fclose(fp);
1710
1711 if (curr_fd != -1) {
1712 if (fchdir(curr_fd))
1713 /* don't care */;
1714 close(curr_fd);
1715 }
1716
1717 return i;
925} 1718}
1719
1720#elif defined(__FreeBSD__) || defined(__DragonFly__)
1721
1722static int load_ld_cache_config(int i, const char *fname)
1723{
1724 FILE *fp = NULL;
1725 char *b = NULL, *p;
1726 struct elfhints_hdr hdr;
1727
1728 fp = fopenat_r(root_fd, root_rel_path(fname));
1729 if (fp == NULL)
1730 return i;
1731
1732 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1733 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1734 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1735 {
1736 fclose(fp);
1737 return i;
1738 }
1739
1740 b = xmalloc(hdr.dirlistlen + 1);
1741 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1742 fclose(fp);
1743 free(b);
1744 return i;
1745 }
1746
1747 while ((p = strsep(&b, ":"))) {
1748 if (*p == '\0')
1749 continue;
1750 xarraypush(ldpaths, p, strlen(p));
1751 }
1752
1753 free(b);
1754 fclose(fp);
1755 return i;
1756}
1757
1758#else
1759#ifdef __ELF__
1760#warning Cache config support not implemented for your target
1761#endif
1762static int load_ld_cache_config(int i, const char *fname)
1763{
1764 return 0;
1765}
1766#endif
926 1767
927/* scan /etc/ld.so.conf for paths */ 1768/* scan /etc/ld.so.conf for paths */
928static void scanelf_ldpath() 1769static void scanelf_ldpath(void)
929{ 1770{
930 char scan_l, scan_ul, scan_ull; 1771 char scan_l, scan_ul, scan_ull;
1772 size_t n;
1773 const char *ldpath;
931 int i = 0; 1774 int i = 0;
932 1775
933 if (!ldpaths[0]) 1776 if (array_cnt(ldpaths) == 0)
934 err("Unable to load any paths from ld.so.conf"); 1777 err("Unable to load any paths from ld.so.conf");
935 1778
936 scan_l = scan_ul = scan_ull = 0; 1779 scan_l = scan_ul = scan_ull = 0;
937 1780
938 while (ldpaths[i]) { 1781 array_for_each(ldpaths, n, ldpath) {
939 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1; 1782 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = 1;
940 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1; 1783 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = 1;
941 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1; 1784 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = 1;
942 scanelf_dir(ldpaths[i]); 1785 scanelf_dir(ldpath);
943 ++i; 1786 ++i;
944 } 1787 }
945 1788
946 if (!scan_l) scanelf_dir("/lib"); 1789 if (!scan_l) scanelf_dir("/lib");
947 if (!scan_ul) scanelf_dir("/usr/lib"); 1790 if (!scan_ul) scanelf_dir("/usr/lib");
948 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1791 if (!scan_ull) scanelf_dir("/usr/local/lib");
949} 1792}
950 1793
951/* scan env PATH for paths */ 1794/* scan env PATH for paths */
952static void scanelf_envpath() 1795static void scanelf_envpath(void)
953{ 1796{
954 char *path, *p; 1797 char *path, *p;
955 1798
956 path = getenv("PATH"); 1799 path = getenv("PATH");
957 if (!path) 1800 if (!path)
964 } 1807 }
965 1808
966 free(path); 1809 free(path);
967} 1810}
968 1811
969 1812/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
970
971/* usage / invocation handling functions */
972#define PARSE_FLAGS "plRmyxetrnibSs:gN:TaqvF:f:o:BhV" 1813#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
973#define a_argument required_argument 1814#define a_argument required_argument
974static struct option const long_opts[] = { 1815static struct option const long_opts[] = {
975 {"path", no_argument, NULL, 'p'}, 1816 {"path", no_argument, NULL, 'p'},
976 {"ldpath", no_argument, NULL, 'l'}, 1817 {"ldpath", no_argument, NULL, 'l'},
1818 {"root", a_argument, NULL, 128},
977 {"recursive", no_argument, NULL, 'R'}, 1819 {"recursive", no_argument, NULL, 'R'},
978 {"mount", no_argument, NULL, 'm'}, 1820 {"mount", no_argument, NULL, 'm'},
979 {"symlink", no_argument, NULL, 'y'}, 1821 {"symlink", no_argument, NULL, 'y'},
1822 {"archives", no_argument, NULL, 'A'},
1823 {"ldcache", no_argument, NULL, 'L'},
1824 {"fix", no_argument, NULL, 'X'},
1825 {"setpax", a_argument, NULL, 'z'},
980 {"pax", no_argument, NULL, 'x'}, 1826 {"pax", no_argument, NULL, 'x'},
981 {"header", no_argument, NULL, 'e'}, 1827 {"header", no_argument, NULL, 'e'},
982 {"textrel", no_argument, NULL, 't'}, 1828 {"textrel", no_argument, NULL, 't'},
983 {"rpath", no_argument, NULL, 'r'}, 1829 {"rpath", no_argument, NULL, 'r'},
984 {"needed", no_argument, NULL, 'n'}, 1830 {"needed", no_argument, NULL, 'n'},
985 {"interp", no_argument, NULL, 'i'}, 1831 {"interp", no_argument, NULL, 'i'},
986 {"bind", no_argument, NULL, 'b'}, 1832 {"bind", no_argument, NULL, 'b'},
987 {"soname", no_argument, NULL, 'S'}, 1833 {"soname", no_argument, NULL, 'S'},
988 {"symbol", a_argument, NULL, 's'}, 1834 {"symbol", a_argument, NULL, 's'},
1835 {"section", a_argument, NULL, 'k'},
989 {"lib", a_argument, NULL, 'N'}, 1836 {"lib", a_argument, NULL, 'N'},
990 {"gmatch", no_argument, NULL, 'g'}, 1837 {"gmatch", no_argument, NULL, 'g'},
991 {"textrels", no_argument, NULL, 'T'}, 1838 {"textrels", no_argument, NULL, 'T'},
1839 {"etype", a_argument, NULL, 'E'},
1840 {"bits", a_argument, NULL, 'M'},
1841 {"endian", no_argument, NULL, 'D'},
1842 {"osabi", no_argument, NULL, 'I'},
1843 {"eabi", no_argument, NULL, 'Y'},
1844 {"perms", a_argument, NULL, 'O'},
1845 {"size", no_argument, NULL, 'Z'},
992 {"all", no_argument, NULL, 'a'}, 1846 {"all", no_argument, NULL, 'a'},
993 {"quiet", no_argument, NULL, 'q'}, 1847 {"quiet", no_argument, NULL, 'q'},
994 {"verbose", no_argument, NULL, 'v'}, 1848 {"verbose", no_argument, NULL, 'v'},
995 {"format", a_argument, NULL, 'F'}, 1849 {"format", a_argument, NULL, 'F'},
996 {"from", a_argument, NULL, 'f'}, 1850 {"from", a_argument, NULL, 'f'},
997 {"file", a_argument, NULL, 'o'}, 1851 {"file", a_argument, NULL, 'o'},
1852 {"nocolor", no_argument, NULL, 'C'},
998 {"nobanner", no_argument, NULL, 'B'}, 1853 {"nobanner", no_argument, NULL, 'B'},
999 {"help", no_argument, NULL, 'h'}, 1854 {"help", no_argument, NULL, 'h'},
1000 {"version", no_argument, NULL, 'V'}, 1855 {"version", no_argument, NULL, 'V'},
1001 {NULL, no_argument, NULL, 0x0} 1856 {NULL, no_argument, NULL, 0x0}
1002}; 1857};
1003 1858
1004static const char *opts_help[] = { 1859static const char * const opts_help[] = {
1005 "Scan all directories in PATH environment", 1860 "Scan all directories in PATH environment",
1006 "Scan all directories in /etc/ld.so.conf", 1861 "Scan all directories in /etc/ld.so.conf",
1862 "Root directory (use with -l or -p)",
1007 "Scan directories recursively", 1863 "Scan directories recursively",
1008 "Don't recursively cross mount points", 1864 "Don't recursively cross mount points",
1009 "Don't scan symlinks\n", 1865 "Don't scan symlinks",
1866 "Scan archives (.a files)",
1867 "Utilize ld.so.cache information (use with -r/-n)",
1868 "Try and 'fix' bad things (use with -r/-e)",
1869 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1010 "Print PaX markings", 1870 "Print PaX markings",
1011 "Print GNU_STACK/PT_LOAD markings", 1871 "Print GNU_STACK/PT_LOAD markings",
1012 "Print TEXTREL information", 1872 "Print TEXTREL information",
1013 "Print RPATH information", 1873 "Print RPATH information",
1014 "Print NEEDED information", 1874 "Print NEEDED information",
1015 "Print INTERP information", 1875 "Print INTERP information",
1016 "Print BIND information", 1876 "Print BIND information",
1017 "Print SONAME information", 1877 "Print SONAME information",
1018 "Find a specified symbol", 1878 "Find a specified symbol",
1879 "Find a specified section",
1019 "Find a specified library", 1880 "Find a specified library",
1020 "Use strncmp to match libraries. (use with -N)", 1881 "Use regex matching rather than string compare (use with -s)",
1021 "Locate cause of TEXTREL", 1882 "Locate cause of TEXTREL",
1022 "Print all scanned info (-x -e -t -r -b)\n", 1883 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1884 "Print only ELF files matching numeric bits",
1885 "Print Endianness",
1886 "Print OSABI",
1887 "Print EABI (EM_ARM Only)",
1888 "Print only ELF files matching octal permissions",
1889 "Print ELF file size",
1890 "Print all useful/simple info\n",
1023 "Only output 'bad' things", 1891 "Only output 'bad' things",
1024 "Be verbose (can be specified more than once)", 1892 "Be verbose (can be specified more than once)",
1025 "Use specified format for output", 1893 "Use specified format for output",
1026 "Read input stream from a filename", 1894 "Read input stream from a filename",
1027 "Write output stream to a filename", 1895 "Write output stream to a filename",
1896 "Don't emit color in output",
1028 "Don't display the header", 1897 "Don't display the header",
1029 "Print this help and exit", 1898 "Print this help and exit",
1030 "Print version and exit", 1899 "Print version and exit",
1031 NULL 1900 NULL
1032}; 1901};
1034/* display usage and exit */ 1903/* display usage and exit */
1035static void usage(int status) 1904static void usage(int status)
1036{ 1905{
1037 unsigned long i; 1906 unsigned long i;
1038 printf("* Scan ELF binaries for stuff\n\n" 1907 printf("* Scan ELF binaries for stuff\n\n"
1039 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1908 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1040 printf("Options: -[%s]\n", PARSE_FLAGS); 1909 printf("Options: -[%s]\n", PARSE_FLAGS);
1041 for (i = 0; long_opts[i].name; ++i) 1910 for (i = 0; long_opts[i].name; ++i)
1042 if (long_opts[i].has_arg == no_argument) 1911 if (long_opts[i].has_arg == no_argument)
1043 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 1912 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1913 long_opts[i].name, opts_help[i]);
1914 else if (long_opts[i].val > '~')
1915 printf(" --%-7s <arg> * %s\n",
1044 long_opts[i].name, opts_help[i]); 1916 long_opts[i].name, opts_help[i]);
1045 else 1917 else
1046 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 1918 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1047 long_opts[i].name, opts_help[i]); 1919 long_opts[i].name, opts_help[i]);
1048 1920
1049 if (status != EXIT_SUCCESS) 1921 puts("\nFor more information, see the scanelf(1) manpage");
1050 exit(status);
1051
1052 puts("\nThe format modifiers for the -F option are:");
1053 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1054 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1055 puts(" i INTERP \tb BIND \ts symbol");
1056 puts(" N library \to Type \tT TEXTRELs");
1057 puts(" S SONAME");
1058 puts(" p filename (with search path removed)");
1059 puts(" f filename (short name/basename)");
1060 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1061
1062 exit(status); 1922 exit(status);
1063} 1923}
1064 1924
1065/* parse command line arguments and preform needed actions */ 1925/* parse command line arguments and preform needed actions */
1926#define do_pax_state(option, flag) \
1927 if (islower(option)) { \
1928 flags &= ~PF_##flag; \
1929 flags |= PF_NO##flag; \
1930 } else { \
1931 flags &= ~PF_NO##flag; \
1932 flags |= PF_##flag; \
1933 }
1066static void parseargs(int argc, char *argv[]) 1934static int parseargs(int argc, char *argv[])
1067{ 1935{
1068 int i; 1936 int i;
1069 char *from_file = NULL; 1937 const char *from_file = NULL;
1938 int ret = 0;
1070 1939
1071 opterr = 0; 1940 opterr = 0;
1072 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1941 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1073 switch (i) { 1942 switch (i) {
1074 1943
1078 VERSION, __FILE__, __DATE__, rcsid, argv0); 1947 VERSION, __FILE__, __DATE__, rcsid, argv0);
1079 exit(EXIT_SUCCESS); 1948 exit(EXIT_SUCCESS);
1080 break; 1949 break;
1081 case 'h': usage(EXIT_SUCCESS); break; 1950 case 'h': usage(EXIT_SUCCESS); break;
1082 case 'f': 1951 case 'f':
1083 if (from_file) err("Don't specify -f twice"); 1952 if (from_file) warn("You prob don't want to specify -f twice");
1084 from_file = xstrdup(optarg); 1953 from_file = optarg;
1954 break;
1955 case 'E':
1956 match_etypes = optarg;
1957 break;
1958 case 'M':
1959 match_bits = atoi(optarg);
1960 if (match_bits == 0) {
1961 if (strcmp(optarg, "ELFCLASS32") == 0)
1962 match_bits = 32;
1963 if (strcmp(optarg, "ELFCLASS64") == 0)
1964 match_bits = 64;
1965 }
1966 break;
1967 case 'O':
1968 if (sscanf(optarg, "%o", &match_perms) == -1)
1969 match_bits = 0;
1085 break; 1970 break;
1086 case 'o': { 1971 case 'o': {
1087 FILE *fp = NULL;
1088 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1972 if (freopen(optarg, "w", stdout) == NULL)
1089 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1973 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1090 SET_STDOUT(fp);
1091 break; 1974 break;
1092 } 1975 }
1093 1976 case 'k':
1977 xarraypush(find_section_arr, optarg, strlen(optarg));
1978 break;
1094 case 's': { 1979 case 's': {
1095 size_t len;
1096 if (find_sym) err("Don't specify -s twice"); 1980 if (find_sym) warn("You prob don't want to specify -s twice");
1097 find_sym = xstrdup(optarg); 1981 find_sym = optarg;
1098 len = strlen(find_sym) + 1;
1099 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
1100 sprintf(versioned_symname, "%s@", find_sym);
1101 break; 1982 break;
1102 } 1983 }
1103 case 'N': { 1984 case 'N':
1104 if (find_lib) err("Don't specify -N twice"); 1985 xarraypush(find_lib_arr, optarg, strlen(optarg));
1105 find_lib = xstrdup(optarg);
1106 break; 1986 break;
1107 }
1108
1109 case 'F': { 1987 case 'F': {
1110 if (out_format) err("Don't specify -F twice"); 1988 if (out_format) warn("You prob don't want to specify -F twice");
1111 out_format = xstrdup(optarg); 1989 out_format = optarg;
1112 break; 1990 break;
1113 } 1991 }
1992 case 'z': {
1993 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1994 size_t x;
1114 1995
1996 for (x = 0; x < strlen(optarg); x++) {
1997 switch (optarg[x]) {
1998 case 'p':
1999 case 'P':
2000 do_pax_state(optarg[x], PAGEEXEC);
2001 break;
2002 case 's':
2003 case 'S':
2004 do_pax_state(optarg[x], SEGMEXEC);
2005 break;
2006 case 'm':
2007 case 'M':
2008 do_pax_state(optarg[x], MPROTECT);
2009 break;
2010 case 'e':
2011 case 'E':
2012 do_pax_state(optarg[x], EMUTRAMP);
2013 break;
2014 case 'r':
2015 case 'R':
2016 do_pax_state(optarg[x], RANDMMAP);
2017 break;
2018 case 'x':
2019 case 'X':
2020 do_pax_state(optarg[x], RANDEXEC);
2021 break;
2022 default:
2023 break;
2024 }
2025 }
2026 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2027 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2028 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2029 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2030 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2031 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2032 setpax = flags;
2033 break;
2034 }
2035 case 'Z': show_size = 1; break;
1115 case 'g': gmatch = 1; 2036 case 'g': g_match = 1; break;
2037 case 'L': use_ldcache = 1; break;
1116 case 'y': scan_symlink = 0; break; 2038 case 'y': scan_symlink = 0; break;
2039 case 'A': scan_archives = 1; break;
2040 case 'C': color_init(true); break;
1117 case 'B': show_banner = 0; break; 2041 case 'B': show_banner = 0; break;
1118 case 'l': scan_ldpath = 1; break; 2042 case 'l': scan_ldpath = 1; break;
1119 case 'p': scan_envpath = 1; break; 2043 case 'p': scan_envpath = 1; break;
1120 case 'R': dir_recurse = 1; break; 2044 case 'R': dir_recurse = 1; break;
1121 case 'm': dir_crossmount = 0; break; 2045 case 'm': dir_crossmount = 0; break;
2046 case 'X': ++fix_elf; break;
1122 case 'x': show_pax = 1; break; 2047 case 'x': show_pax = 1; break;
1123 case 'e': show_phdr = 1; break; 2048 case 'e': show_phdr = 1; break;
1124 case 't': show_textrel = 1; break; 2049 case 't': show_textrel = 1; break;
1125 case 'r': show_rpath = 1; break; 2050 case 'r': show_rpath = 1; break;
1126 case 'n': show_needed = 1; break; 2051 case 'n': show_needed = 1; break;
1128 case 'b': show_bind = 1; break; 2053 case 'b': show_bind = 1; break;
1129 case 'S': show_soname = 1; break; 2054 case 'S': show_soname = 1; break;
1130 case 'T': show_textrels = 1; break; 2055 case 'T': show_textrels = 1; break;
1131 case 'q': be_quiet = 1; break; 2056 case 'q': be_quiet = 1; break;
1132 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2057 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1133 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 2058 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1134 2059 case 'D': show_endian = 1; break;
2060 case 'I': show_osabi = 1; break;
2061 case 'Y': show_eabi = 1; break;
2062 case 128:
2063 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2064 if (root_fd == -1)
2065 err("Could not open root: %s", optarg);
2066 break;
1135 case ':': 2067 case ':':
1136 err("Option missing parameter\n"); 2068 err("Option '%c' is missing parameter", optopt);
1137 case '?': 2069 case '?':
1138 err("Unknown option\n"); 2070 err("Unknown option '%c' or argument missing", optopt);
1139 default: 2071 default:
1140 err("Unhandled option '%c'", i); 2072 err("Unhandled option '%c'; please report this", i);
1141 }
1142 } 2073 }
1143 2074 }
2075 if (show_textrels && be_verbose)
2076 has_objdump = bin_in_path("objdump");
2077 /* flatten arrays for display */
2078 if (array_cnt(find_lib_arr))
2079 find_lib = array_flatten_str(find_lib_arr);
2080 if (array_cnt(find_section_arr))
2081 find_section = array_flatten_str(find_section_arr);
1144 /* let the format option override all other options */ 2082 /* let the format option override all other options */
1145 if (out_format) { 2083 if (out_format) {
1146 show_pax = show_phdr = show_textrel = show_rpath = \ 2084 show_pax = show_phdr = show_textrel = show_rpath = \
1147 show_needed = show_interp = show_bind = show_soname = \ 2085 show_needed = show_interp = show_bind = show_soname = \
1148 show_textrels = 0; 2086 show_textrels = show_perms = show_endian = show_size = \
2087 show_osabi = show_eabi = 0;
1149 for (i = 0; out_format[i]; ++i) { 2088 for (i = 0; out_format[i]; ++i) {
1150 if (!IS_MODIFIER(out_format[i])) continue; 2089 if (!IS_MODIFIER(out_format[i])) continue;
1151 2090
1152 switch (out_format[++i]) { 2091 switch (out_format[++i]) {
2092 case '+': break;
1153 case '%': break; 2093 case '%': break;
1154 case '#': break; 2094 case '#': break;
1155 case 'F': break; 2095 case 'F': break;
1156 case 'p': break; 2096 case 'p': break;
1157 case 'f': break; 2097 case 'f': break;
2098 case 'k': break;
1158 case 's': break; 2099 case 's': break;
1159 case 'N': break; 2100 case 'N': break;
1160 case 'o': break; 2101 case 'o': break;
2102 case 'a': break;
2103 case 'M': break;
2104 case 'Z': show_size = 1; break;
2105 case 'D': show_endian = 1; break;
2106 case 'I': show_osabi = 1; break;
2107 case 'Y': show_eabi = 1; break;
2108 case 'O': show_perms = 1; break;
1161 case 'x': show_pax = 1; break; 2109 case 'x': show_pax = 1; break;
1162 case 'e': show_phdr = 1; break; 2110 case 'e': show_phdr = 1; break;
1163 case 't': show_textrel = 1; break; 2111 case 't': show_textrel = 1; break;
1164 case 'r': show_rpath = 1; break; 2112 case 'r': show_rpath = 1; break;
1165 case 'n': show_needed = 1; break; 2113 case 'n': show_needed = 1; break;
1166 case 'i': show_interp = 1; break; 2114 case 'i': show_interp = 1; break;
1167 case 'b': show_bind = 1; break; 2115 case 'b': show_bind = 1; break;
1168 case 'S': show_soname = 1; break; 2116 case 'S': show_soname = 1; break;
1169 case 'T': show_textrels = 1; break; 2117 case 'T': show_textrels = 1; break;
1170 default: 2118 default:
1171 err("Invalid format specifier '%c' (byte %i)", 2119 err("Invalid format specifier '%c' (byte %i)",
1172 out_format[i], i+1); 2120 out_format[i], i+1);
1173 } 2121 }
1174 } 2122 }
1175 2123
1176 /* construct our default format */ 2124 /* construct our default format */
1177 } else { 2125 } else {
1178 size_t fmt_len = 30; 2126 size_t fmt_len = 30;
1179 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2127 out_format = xmalloc(sizeof(char) * fmt_len);
2128 *out_format = '\0';
1180 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2129 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1181 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2130 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2131 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2132 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2133 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2134 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2135 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1182 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2136 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1183 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2137 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1184 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2138 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1185 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2139 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1186 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2140 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1187 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2141 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1188 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2142 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1189 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2143 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1190 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2144 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2145 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1191 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2146 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1192 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2147 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1193 } 2148 }
1194 if (be_verbose > 2) printf("Format: %s\n", out_format); 2149 if (be_verbose > 2) printf("Format: %s\n", out_format);
1195 2150
1196 /* now lets actually do the scanning */ 2151 /* now lets actually do the scanning */
1197 if (scan_ldpath || (show_rpath && be_quiet)) 2152 if (scan_ldpath || use_ldcache)
1198 load_ld_so_conf(); 2153 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1199 if (scan_ldpath) scanelf_ldpath(); 2154 if (scan_ldpath) scanelf_ldpath();
1200 if (scan_envpath) scanelf_envpath(); 2155 if (scan_envpath) scanelf_envpath();
2156 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2157 from_file = "-";
1201 if (from_file) { 2158 if (from_file) {
1202 scanelf_from_file(from_file); 2159 scanelf_from_file(from_file);
1203 free(from_file);
1204 from_file = *argv; 2160 from_file = *argv;
1205 } 2161 }
1206 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2162 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1207 err("Nothing to scan !?"); 2163 err("Nothing to scan !?");
1208 while (optind < argc) { 2164 while (optind < argc) {
1209 search_path = argv[optind++]; 2165 search_path = argv[optind++];
1210 scanelf_dir(search_path); 2166 ret = scanelf_dir(search_path);
1211 } 2167 }
1212 2168
1213 /* clean up */ 2169 /* clean up */
1214 if (find_sym) { 2170 xarrayfree(ldpaths);
2171 xarrayfree(find_lib_arr);
2172 xarrayfree(find_section_arr);
1215 free(find_sym); 2173 free(find_lib);
1216 free(versioned_symname); 2174 free(find_section);
1217 }
1218 if (find_lib) free(find_lib);
1219 if (out_format) free(out_format);
1220 for (i = 0; ldpaths[i]; ++i)
1221 free(ldpaths[i]);
1222}
1223 2175
1224 2176 if (ldcache != 0)
1225 2177 munmap(ldcache, ldcache_size);
1226/* utility funcs */
1227static char *xstrdup(const char *s)
1228{
1229 char *ret = strdup(s);
1230 if (!ret) err("Could not strdup(): %s", strerror(errno));
1231 return ret; 2178 return ret;
1232} 2179}
1233 2180
1234static void *xmalloc(size_t size) 2181static char **get_split_env(const char *envvar)
1235{ 2182{
1236 void *ret = malloc(size); 2183 const char *delims = " \t\n";
1237 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 2184 char **envvals = NULL;
1238 return ret; 2185 char *env, *s;
1239} 2186 int nentry;
1240 2187
1241static void xstrcat(char **dst, const char *src, size_t *curr_len) 2188 if ((env = getenv(envvar)) == NULL)
1242{ 2189 return NULL;
1243 size_t new_len;
1244 2190
1245 new_len = strlen(*dst) + strlen(src); 2191 env = xstrdup(env);
1246 if (*curr_len <= new_len) { 2192 if (env == NULL)
1247 *curr_len = new_len + (*curr_len / 2); 2193 return NULL;
1248 *dst = realloc(*dst, *curr_len);
1249 if (!*dst)
1250 err("could not realloc %li bytes", (unsigned long)*curr_len);
1251 }
1252 2194
1253 strcat(*dst, src); 2195 s = strtok(env, delims);
1254} 2196 if (s == NULL) {
2197 free(env);
2198 return NULL;
2199 }
1255 2200
1256static inline void xchrcat(char **dst, const char append, size_t *curr_len) 2201 nentry = 0;
1257{ 2202 while (s != NULL) {
1258 static char my_app[2]; 2203 ++nentry;
1259 my_app[0] = append; 2204 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1260 my_app[1] = '\0'; 2205 envvals[nentry-1] = s;
1261 xstrcat(dst, my_app, curr_len); 2206 s = strtok(NULL, delims);
1262} 2207 }
2208 envvals[nentry] = NULL;
1263 2209
2210 /* don't want to free(env) as it contains the memory that backs
2211 * the envvals array of strings */
2212 return envvals;
2213}
1264 2214
2215static void parseenv(void)
2216{
2217 color_init(false);
2218 qa_textrels = get_split_env("QA_TEXTRELS");
2219 qa_execstack = get_split_env("QA_EXECSTACK");
2220 qa_wx_load = get_split_env("QA_WX_LOAD");
2221}
2222
2223#ifdef __PAX_UTILS_CLEANUP
2224static void cleanup(void)
2225{
2226 free(out_format);
2227 free(qa_textrels);
2228 free(qa_execstack);
2229 free(qa_wx_load);
2230}
2231#endif
1265 2232
1266int main(int argc, char *argv[]) 2233int main(int argc, char *argv[])
1267{ 2234{
2235 int ret;
1268 if (argc < 2) 2236 if (argc < 2)
1269 usage(EXIT_FAILURE); 2237 usage(EXIT_FAILURE);
2238 parseenv();
1270 parseargs(argc, argv); 2239 ret = parseargs(argc, argv);
1271 fclose(stdout); 2240 fclose(stdout);
1272#ifdef __BOUNDS_CHECKING_ON 2241#ifdef __PAX_UTILS_CLEANUP
1273 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); 2242 cleanup();
2243 warn("The calls to add/delete heap should be off:\n"
2244 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2245 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1274#endif 2246#endif
1275 return EXIT_SUCCESS; 2247 return ret;
1276} 2248}
2249
2250/* Match filename against entries in matchlist, return TRUE
2251 * if the file is listed */
2252static int file_matches_list(const char *filename, char **matchlist)
2253{
2254 char **file;
2255 char *match;
2256 char buf[__PAX_UTILS_PATH_MAX];
2257
2258 if (matchlist == NULL)
2259 return 0;
2260
2261 for (file = matchlist; *file != NULL; file++) {
2262 if (search_path) {
2263 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2264 match = buf;
2265 } else {
2266 match = *file;
2267 }
2268 if (fnmatch(match, filename, 0) == 0)
2269 return 1;
2270 }
2271 return 0;
2272}

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