/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.88 Revision 1.229
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 1.229 2011/09/27 19:29:19 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 1.229 2011/09/27 19:29:19 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 char *root;
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 char *which(const char *fname)
74{
75 static char fullpath[__PAX_UTILS_PATH_MAX];
76 char *path, *p;
77
78 path = getenv("PATH");
79 if (!path)
80 return NULL;
81
82 path = xstrdup(path);
83 while ((p = strrchr(path, ':')) != NULL) {
84 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
85 *p = 0;
86 if (access(fullpath, R_OK) != -1) {
87 free(path);
88 return fullpath;
89 }
90 }
91 free(path);
92 return NULL;
93}
94
95/* 1 on failure. 0 otherwise */
96static int rematch(const char *regex, const char *match, int cflags)
97{
98 regex_t preg;
99 int ret;
100
101 if ((match == NULL) || (regex == NULL))
102 return EXIT_FAILURE;
103
104 if ((ret = regcomp(&preg, regex, cflags))) {
105 char err[256];
106
107 if (regerror(ret, &preg, err, sizeof(err)))
108 fprintf(stderr, "regcomp failed: %s", err);
109 else
110 fprintf(stderr, "regcomp failed");
111
112 return EXIT_FAILURE;
113 }
114 ret = regexec(&preg, match, 0, NULL, 0);
115 regfree(&preg);
116
117 return ret;
118}
70 119
71/* sub-funcs for scanelf_file() */ 120/* sub-funcs for scanelf_file() */
72static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 121static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
73{ 122{
74 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 123 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
124
125 /* debug sections */
126 void *symtab = elf_findsecbyname(elf, ".symtab");
127 void *strtab = elf_findsecbyname(elf, ".strtab");
128 /* runtime sections */
129 void *dynsym = elf_findsecbyname(elf, ".dynsym");
130 void *dynstr = elf_findsecbyname(elf, ".dynstr");
131
75#define GET_SYMTABS(B) \ 132#define GET_SYMTABS(B) \
76 if (elf->elf_class == ELFCLASS ## B) { \ 133 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) { \ 134 if (symtab && dynsym) { \
135 Elf ## B ## _Shdr *esymtab = symtab; \
136 Elf ## B ## _Shdr *edynsym = dynsym; \
85 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 137 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
86 } else { \ 138 } else \
87 *sym = (void*)(symtab ? symtab : dynsym); \ 139 *sym = symtab ? symtab : dynsym; \
88 } \
89 if (strtab && dynstr) { \ 140 if (strtab && dynstr) { \
141 Elf ## B ## _Shdr *estrtab = strtab; \
142 Elf ## B ## _Shdr *edynstr = dynstr; \
90 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ 143 *tab = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
91 } else { \ 144 } else \
92 *tab = (void*)(strtab ? strtab : dynstr); \ 145 *tab = strtab ? strtab : dynstr; \
93 } \
94 } 146 }
95 GET_SYMTABS(32) 147 GET_SYMTABS(32)
96 GET_SYMTABS(64) 148 GET_SYMTABS(64)
97} 149}
150
98static char *scanelf_file_pax(elfobj *elf, char *found_pax) 151static char *scanelf_file_pax(elfobj *elf, char *found_pax)
99{ 152{
100 static char *paxflags;
101 static char ret[7]; 153 static char ret[7];
102 unsigned long i, shown; 154 unsigned long i, shown;
103 155
104 if (!show_pax) return NULL; 156 if (!show_pax) return NULL;
105 157
112 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 164 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
113 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 165 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
114 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 166 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
115 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 167 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
116 continue; \ 168 continue; \
117 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 169 if (fix_elf && setpax) { \
170 /* set the paxctl flags */ \
171 ESET(phdr[i].p_flags, setpax); \
172 } \
173 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
118 continue; \ 174 continue; \
119 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 175 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
120 *found_pax = 1; \ 176 *found_pax = 1; \
121 ++shown; \ 177 ++shown; \
122 break; \ 178 break; \
124 } 180 }
125 SHOW_PAX(32) 181 SHOW_PAX(32)
126 SHOW_PAX(64) 182 SHOW_PAX(64)
127 } 183 }
128 184
185 if (fix_elf && setpax) {
186 /* set the chpax settings */
187 if (elf->elf_class == ELFCLASS32) {
188 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
189 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
190 } else {
191 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
192 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
193 }
194 }
195
129 /* fall back to EI_PAX if no PT_PAX was found */ 196 /* fall back to EI_PAX if no PT_PAX was found */
130 if (!*ret) { 197 if (!*ret) {
198 static char *paxflags;
131 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 199 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
132 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) { 200 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
133 *found_pax = 1; 201 *found_pax = 1;
134 return paxflags; 202 return (be_wewy_wewy_quiet ? NULL : paxflags);
135 } 203 }
136 strncpy(ret, paxflags, sizeof(ret)); 204 strncpy(ret, paxflags, sizeof(ret));
137 } 205 }
138 206
139 if (be_quiet && !shown) 207 if (be_wewy_wewy_quiet || (be_quiet && !shown))
140 return NULL; 208 return NULL;
209 else
141 return ret; 210 return ret;
142
143} 211}
212
144static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 213static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
145{ 214{
146 static char ret[12]; 215 static char ret[12];
147 char *found; 216 char *found;
148 unsigned long i, off, shown, check_flags;
149 unsigned char multi_stack, multi_relro, multi_load; 217 unsigned long i, shown, multi_stack, multi_relro, multi_load;
218 int max_pt_load;
150 219
151 if (!show_phdr) return NULL; 220 if (!show_phdr) return NULL;
152 221
153 memcpy(ret, "--- --- ---\0", 12); 222 memcpy(ret, "--- --- ---\0", 12);
154 223
155 shown = 0; 224 shown = 0;
156 multi_stack = multi_relro = multi_load = 0; 225 multi_stack = multi_relro = multi_load = 0;
226 max_pt_load = elf_max_pt_load(elf);
157 227
158 if (elf->phdr) { 228#define NOTE_GNU_STACK ".note.GNU-stack"
159#define SHOW_PHDR(B) \ 229#define SHOW_PHDR(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \ 230 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 231 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
232 Elf ## B ## _Off offset; \
233 uint32_t flags, check_flags; \
234 if (elf->phdr != NULL) { \
162 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 235 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
163 uint32_t flags; \
164 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 236 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
165 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 237 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
238 if (multi_stack++) \
166 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 239 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
240 if (file_matches_list(elf->filename, qa_execstack)) \
241 continue; \
167 found = found_phdr; \ 242 found = found_phdr; \
168 off = 0; \ 243 offset = 0; \
169 check_flags = PF_X; \ 244 check_flags = PF_X; \
170 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 245 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
246 if (multi_relro++) \
171 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 247 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
172 found = found_relro; \ 248 found = found_relro; \
173 off = 4; \ 249 offset = 4; \
174 check_flags = PF_X; \ 250 check_flags = PF_X; \
175 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 251 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
176 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 252 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
253 if (multi_load++ > max_pt_load) \
254 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
255 if (file_matches_list(elf->filename, qa_wx_load)) \
256 continue; \
177 found = found_load; \ 257 found = found_load; \
178 off = 8; \ 258 offset = 8; \
179 check_flags = PF_W|PF_X; \ 259 check_flags = PF_W|PF_X; \
180 } else \ 260 } else \
181 continue; \ 261 continue; \
182 flags = EGET(phdr[i].p_flags); \ 262 flags = EGET(phdr[i].p_flags); \
183 if (be_quiet && ((flags & check_flags) != check_flags)) \ 263 if (be_quiet && ((flags & check_flags) != check_flags)) \
184 continue; \ 264 continue; \
265 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
266 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
267 ret[3] = ret[7] = '!'; \
268 flags = EGET(phdr[i].p_flags); \
269 } \
185 memcpy(ret+off, gnu_short_stack_flags(flags), 3); \ 270 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
186 *found = 1; \ 271 *found = 1; \
187 ++shown; \ 272 ++shown; \
273 } \
274 } else if (elf->shdr != NULL) { \
275 /* no program headers which means this is prob an object file */ \
276 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
277 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
278 char *str; \
279 if ((void*)strtbl > elf->data_end) \
280 goto skip_this_shdr##B; \
281 check_flags = SHF_WRITE|SHF_EXECINSTR; \
282 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
283 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
284 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
285 str = elf->data + offset; \
286 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
287 if (!strcmp(str, NOTE_GNU_STACK)) { \
288 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
289 flags = EGET(shdr[i].sh_flags); \
290 if (be_quiet && ((flags & check_flags) != check_flags)) \
291 continue; \
292 ++*found_phdr; \
293 shown = 1; \
294 if (flags & SHF_WRITE) ret[0] = 'W'; \
295 if (flags & SHF_ALLOC) ret[1] = 'A'; \
296 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
297 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
298 break; \
299 } \
300 } \
301 skip_this_shdr##B: \
302 if (!multi_stack) { \
303 if (file_matches_list(elf->filename, qa_execstack)) \
304 return NULL; \
305 *found_phdr = 1; \
306 shown = 1; \
307 memcpy(ret, "!WX", 3); \
308 } \
188 } \ 309 } \
189 } 310 }
190 SHOW_PHDR(32) 311 SHOW_PHDR(32)
191 SHOW_PHDR(64) 312 SHOW_PHDR(64)
192 }
193 313
194 if (be_quiet && !shown) 314 if (be_wewy_wewy_quiet || (be_quiet && !shown))
195 return NULL; 315 return NULL;
196 else 316 else
197 return ret; 317 return ret;
198} 318}
319
320/*
321 * See if this ELF contains a DT_TEXTREL tag in any of its
322 * PT_DYNAMIC sections.
323 */
199static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 324static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
200{ 325{
201 static char ret[] = "TEXTREL"; 326 static const char *ret = "TEXTREL";
202 unsigned long i; 327 unsigned long i;
203 328
204 if (!show_textrel && !show_textrels) return NULL; 329 if (!show_textrel && !show_textrels) return NULL;
330
331 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
205 332
206 if (elf->phdr) { 333 if (elf->phdr) {
207#define SHOW_TEXTREL(B) \ 334#define SHOW_TEXTREL(B) \
208 if (elf->elf_class == ELFCLASS ## B) { \ 335 if (elf->elf_class == ELFCLASS ## B) { \
209 Elf ## B ## _Dyn *dyn; \ 336 Elf ## B ## _Dyn *dyn; \
210 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 337 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
211 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 338 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
212 Elf ## B ## _Off offset; \ 339 Elf ## B ## _Off offset; \
213 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 340 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
214 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 341 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
215 offset = EGET(phdr[i].p_offset); \ 342 offset = EGET(phdr[i].p_offset); \
216 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 343 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
217 dyn = DYN ## B (elf->data + offset); \ 344 dyn = DYN ## B (elf->vdata + offset); \
218 while (EGET(dyn->d_tag) != DT_NULL) { \ 345 while (EGET(dyn->d_tag) != DT_NULL) { \
219 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 346 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
220 *found_textrel = 1; \ 347 *found_textrel = 1; \
221 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 348 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
222 return (be_wewy_wewy_quiet ? NULL : ret); \ 349 return (be_wewy_wewy_quiet ? NULL : ret); \
229 } 356 }
230 357
231 if (be_quiet || be_wewy_wewy_quiet) 358 if (be_quiet || be_wewy_wewy_quiet)
232 return NULL; 359 return NULL;
233 else 360 else
234 return (char *)" - "; 361 return " - ";
235} 362}
363
364/*
365 * Scan the .text section to see if there are any relocations in it.
366 * Should rewrite this to check PT_LOAD sections that are marked
367 * Executable rather than the section named '.text'.
368 */
236static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 369static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
237{ 370{
238 unsigned long s, r, rmax; 371 unsigned long s, r, rmax;
239 void *symtab_void, *strtab_void, *text_void; 372 void *symtab_void, *strtab_void, *text_void;
240 373
261 Elf ## B ## _Rela *rela; \ 394 Elf ## B ## _Rela *rela; \
262 /* search the section headers for relocations */ \ 395 /* search the section headers for relocations */ \
263 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 396 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
264 uint32_t sh_type = EGET(shdr[s].sh_type); \ 397 uint32_t sh_type = EGET(shdr[s].sh_type); \
265 if (sh_type == SHT_REL) { \ 398 if (sh_type == SHT_REL) { \
266 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 399 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
267 rela = NULL; \ 400 rela = NULL; \
268 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 401 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
269 } else if (sh_type == SHT_RELA) { \ 402 } else if (sh_type == SHT_RELA) { \
270 rel = NULL; \ 403 rel = NULL; \
271 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 404 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
272 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 405 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
273 } else \ 406 } else \
274 continue; \ 407 continue; \
275 /* now see if any of the relocs are in the .text */ \ 408 /* now see if any of the relocs are in the .text */ \
276 for (r = 0; r < rmax; ++r) { \ 409 for (r = 0; r < rmax; ++r) { \
291 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 424 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
292 if (be_verbose <= 2) continue; \ 425 if (be_verbose <= 2) continue; \
293 } else \ 426 } else \
294 *found_textrels = 1; \ 427 *found_textrels = 1; \
295 /* locate this relocation symbol name */ \ 428 /* locate this relocation symbol name */ \
296 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 429 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
430 if ((void*)sym > elf->data_end) { \
431 warn("%s: corrupt ELF symbol", elf->filename); \
432 continue; \
433 } \
297 sym_max = ELF ## B ## _R_SYM(r_info); \ 434 sym_max = ELF ## B ## _R_SYM(r_info); \
298 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 435 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
299 sym += sym_max; \ 436 sym += sym_max; \
300 else \ 437 else \
301 sym = NULL; \ 438 sym = NULL; \
302 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 439 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
303 /* show the raw details about this reloc */ \ 440 /* show the raw details about this reloc */ \
304 printf(" %s: ", elf->base_filename); \ 441 printf(" %s: ", elf->base_filename); \
305 if (sym && sym->st_name) \ 442 if (sym && sym->st_name) \
306 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 443 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
307 else \ 444 else \
308 printf("(memory/fake?)"); \ 445 printf("(memory/data?)"); \
309 printf(" [0x%lX]", (unsigned long)r_offset); \ 446 printf(" [0x%lX]", (unsigned long)r_offset); \
310 /* now try to find the closest symbol that this rel is probably in */ \ 447 /* now try to find the closest symbol that this rel is probably in */ \
311 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 448 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
312 func = NULL; \ 449 func = NULL; \
313 offset_tmp = 0; \ 450 offset_tmp = 0; \
314 while (sym_max--) { \ 451 while (sym_max--) { \
315 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 452 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
316 func = sym; \ 453 func = sym; \
317 offset_tmp = EGET(sym->st_value); \ 454 offset_tmp = EGET(sym->st_value); \
318 } \ 455 } \
319 ++sym; \ 456 ++sym; \
320 } \ 457 } \
321 printf(" in "); \ 458 printf(" in "); \
322 if (func && func->st_name) \ 459 if (func && func->st_name) { \
323 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 460 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
461 if (r_offset > EGET(func->st_size)) \
462 printf("(optimized out: previous %s)", func_name); \
324 else \ 463 else \
325 printf("(NULL: fake?)"); \ 464 printf("%s", func_name); \
465 } else \
466 printf("(optimized out)"); \
326 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 467 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
468 if (be_verbose && has_objdump) { \
469 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
470 char *sysbuf; \
471 size_t syslen; \
472 int sysret; \
473 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"; \
474 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
475 sysbuf = xmalloc(syslen); \
476 if (end_addr < r_offset) \
477 /* not uncommon when things are optimized out */ \
478 end_addr = r_offset + 0x100; \
479 snprintf(sysbuf, syslen, sysfmt, \
480 (unsigned long)offset_tmp, \
481 (unsigned long)end_addr, \
482 elf->filename, \
483 (unsigned long)r_offset); \
484 fflush(stdout); \
485 sysret = system(sysbuf); \
486 fflush(stdout); \
487 free(sysbuf); \
488 } \
327 } \ 489 } \
328 } } 490 } }
329 SHOW_TEXTRELS(32) 491 SHOW_TEXTRELS(32)
330 SHOW_TEXTRELS(64) 492 SHOW_TEXTRELS(64)
331 } 493 }
333 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 495 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
334 496
335 return NULL; 497 return NULL;
336} 498}
337 499
338static void rpath_security_checks(elfobj *, char *);
339static void rpath_security_checks(elfobj *elf, char *item) { 500static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
501{
340 struct stat st; 502 struct stat st;
341 switch (*item) { 503 switch (*item) {
504 case '/': break;
342 case 0: 505 case '.':
343 warnf("Security problem NULL RPATH in %s", elf->filename); 506 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
344 break; 507 break;
345 case '/': break; 508 case ':':
509 case '\0':
510 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
511 break;
346 case '$': 512 case '$':
347 if (fstat(elf->fd, &st) != -1) 513 if (fstat(elf->fd, &st) != -1)
348 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 514 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", 515 warnf("Security problem with %s='%s' in %s with mode set of %o",
350 item, elf->filename, st.st_mode & 07777); 516 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
351 break; 517 break;
352 default: 518 default:
353 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); 519 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
354 break; 520 break;
355 } 521 }
356} 522}
357static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 523static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
358{ 524{
359 unsigned long i, s; 525 unsigned long i;
360 char *rpath, *runpath, **r; 526 char *rpath, *runpath, **r;
361 void *strtbl_void; 527 void *strtbl_void;
362 528
363 if (!show_rpath) return; 529 if (!show_rpath) return;
364 530
375 Elf ## B ## _Off offset; \ 541 Elf ## B ## _Off offset; \
376 Elf ## B ## _Xword word; \ 542 Elf ## B ## _Xword word; \
377 /* Scan all the program headers */ \ 543 /* Scan all the program headers */ \
378 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 544 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
379 /* Just scan dynamic headers */ \ 545 /* Just scan dynamic headers */ \
380 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 546 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
381 offset = EGET(phdr[i].p_offset); \ 547 offset = EGET(phdr[i].p_offset); \
382 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 548 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
383 /* Just scan dynamic RPATH/RUNPATH headers */ \ 549 /* Just scan dynamic RPATH/RUNPATH headers */ \
384 dyn = DYN ## B (elf->data + offset); \ 550 dyn = DYN ## B (elf->vdata + offset); \
385 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 551 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
386 if (word == DT_RPATH) { \ 552 if (word == DT_RPATH) { \
387 r = &rpath; \ 553 r = &rpath; \
388 } else if (word == DT_RUNPATH) { \ 554 } else if (word == DT_RUNPATH) { \
389 r = &runpath; \ 555 r = &runpath; \
393 } \ 559 } \
394 /* Verify the memory is somewhat sane */ \ 560 /* Verify the memory is somewhat sane */ \
395 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 561 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
396 if (offset < (Elf ## B ## _Off)elf->len) { \ 562 if (offset < (Elf ## B ## _Off)elf->len) { \
397 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 563 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
398 *r = (char*)(elf->data + offset); \ 564 *r = elf->data + offset; \
565 /* cache the length in case we need to nuke this section later on */ \
566 if (fix_elf) \
567 offset = strlen(*r); \
399 /* If quiet, don't output paths in ld.so.conf */ \ 568 /* If quiet, don't output paths in ld.so.conf */ \
400 if (be_quiet) { \ 569 if (be_quiet) { \
401 size_t len; \ 570 size_t len; \
402 char *start, *end; \ 571 char *start, *end; \
403 /* note that we only 'chop' off leading known paths. */ \ 572 /* note that we only 'chop' off leading known paths. */ \
404 /* since *r is read-only memory, we can only move the ptr forward. */ \ 573 /* since *r is read-only memory, we can only move the ptr forward. */ \
405 start = *r; \ 574 start = *r; \
406 /* scan each path in : delimited list */ \ 575 /* scan each path in : delimited list */ \
407 while (start) { \ 576 while (start) { \
408 rpath_security_checks(elf, start); \ 577 rpath_security_checks(elf, start, get_elfdtype(word)); \
409 end = strchr(start, ':'); \ 578 end = strchr(start, ':'); \
410 len = (end ? abs(end - start) : strlen(start)); \ 579 len = (end ? abs(end - start) : strlen(start)); \
411 for (s = 0; ldpaths[s]; ++s) { \ 580 if (use_ldcache) { \
581 size_t n; \
582 const char *ldpath; \
583 array_for_each(ldpaths, n, ldpath) \
412 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 584 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
413 *r = (end ? end + 1 : NULL); \ 585 *r = end; \
586 /* corner case ... if RPATH reads "/usr/lib:", we want \
587 * to show ':' rather than '' */ \
588 if (end && end[1] != '\0') \
589 (*r)++; \
414 break; \ 590 break; \
415 } \ 591 } \
416 } \ 592 } \
417 if (!*r || !ldpaths[s] || !end) \ 593 if (!*r || !end) \
418 start = NULL; \ 594 break; \
419 else \ 595 else \
420 start = start + len + 1; \ 596 start = start + len + 1; \
421 } \ 597 } \
422 } \ 598 } \
599 if (*r) { \
600 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
601 /* just nuke it */ \
602 nuke_it##B: \
603 memset(*r, 0x00, offset); \
604 *r = NULL; \
605 ESET(dyn->d_tag, DT_DEBUG); \
606 ESET(dyn->d_un.d_ptr, 0); \
607 } else if (fix_elf) { \
608 /* try to clean "bad" paths */ \
609 size_t len, tmpdir_len; \
610 char *start, *end; \
611 const char *tmpdir; \
612 start = *r; \
613 tmpdir = (getenv("TMPDIR") ? : "."); \
614 tmpdir_len = strlen(tmpdir); \
615 while (1) { \
616 end = strchr(start, ':'); \
617 if (start == end) { \
618 eat_this_path##B: \
619 len = strlen(end); \
620 memmove(start, end+1, len); \
621 start[len-1] = '\0'; \
622 end = start - 1; \
623 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
624 if (!end) { \
625 if (start == *r) \
626 goto nuke_it##B; \
627 *--start = '\0'; \
628 } else \
629 goto eat_this_path##B; \
630 } \
631 if (!end) \
632 break; \
633 start = end + 1; \
634 } \
635 if (**r == '\0') \
636 goto nuke_it##B; \
637 } \
638 if (*r) \
423 if (*r) *found_rpath = 1; \ 639 *found_rpath = 1; \
640 } \
424 } \ 641 } \
425 ++dyn; \ 642 ++dyn; \
426 } \ 643 } \
427 } } 644 } }
428 SHOW_RPATH(32) 645 SHOW_RPATH(32)
445 } else if (rpath || runpath) 662 } else if (rpath || runpath)
446 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 663 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
447 else if (!be_quiet) 664 else if (!be_quiet)
448 xstrcat(ret, " - ", ret_len); 665 xstrcat(ret, " - ", ret_len);
449} 666}
667
668#define LDSO_CACHE_MAGIC "ld.so-"
669#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
670#define LDSO_CACHE_VER "1.7.0"
671#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
672#define FLAG_ANY -1
673#define FLAG_TYPE_MASK 0x00ff
674#define FLAG_LIBC4 0x0000
675#define FLAG_ELF 0x0001
676#define FLAG_ELF_LIBC5 0x0002
677#define FLAG_ELF_LIBC6 0x0003
678#define FLAG_REQUIRED_MASK 0xff00
679#define FLAG_SPARC_LIB64 0x0100
680#define FLAG_IA64_LIB64 0x0200
681#define FLAG_X8664_LIB64 0x0300
682#define FLAG_S390_LIB64 0x0400
683#define FLAG_POWERPC_LIB64 0x0500
684#define FLAG_MIPS64_LIBN32 0x0600
685#define FLAG_MIPS64_LIBN64 0x0700
686
687#if defined(__GLIBC__) || defined(__UCLIBC__)
688
689static char *lookup_cache_lib(elfobj *elf, char *fname)
690{
691 int fd;
692 char *strs;
693 static char buf[__PAX_UTILS_PATH_MAX] = "";
694 const char cachefile[] = "/etc/ld.so.cache";
695 struct stat st;
696
697 typedef struct {
698 char magic[LDSO_CACHE_MAGIC_LEN];
699 char version[LDSO_CACHE_VER_LEN];
700 int nlibs;
701 } header_t;
702 header_t *header;
703
704 typedef struct {
705 int flags;
706 int sooffset;
707 int liboffset;
708 } libentry_t;
709 libentry_t *libent;
710
711 if (fname == NULL)
712 return NULL;
713
714 if (ldcache == NULL) {
715 if (stat(cachefile, &st))
716 return NULL;
717
718 fd = open(cachefile, O_RDONLY);
719 if (fd == -1)
720 return NULL;
721
722 /* cache these values so we only map/unmap the cache file once */
723 ldcache_size = st.st_size;
724 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
725 close(fd);
726
727 if (ldcache == MAP_FAILED) {
728 ldcache = NULL;
729 return NULL;
730 }
731
732 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
733 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
734 {
735 munmap(ldcache, ldcache_size);
736 ldcache = NULL;
737 return NULL;
738 }
739 } else
740 header = ldcache;
741
742 libent = ldcache + sizeof(header_t);
743 strs = (char *) &libent[header->nlibs];
744
745 for (fd = 0; fd < header->nlibs; ++fd) {
746 /* This should be more fine grained, but for now we assume that
747 * diff arches will not be cached together, and we ignore the
748 * the different multilib mips cases.
749 */
750 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
751 continue;
752 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
753 continue;
754
755 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
756 continue;
757
758 /* Return first hit because that is how the ldso rolls */
759 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
760 break;
761 }
762
763 return buf;
764}
765
766#elif defined(__NetBSD__)
767static char *lookup_cache_lib(elfobj *elf, char *fname)
768{
769 static char buf[__PAX_UTILS_PATH_MAX] = "";
770 static struct stat st;
771 size_t n;
772 char *ldpath;
773
774 array_for_each(ldpath, n, ldpath) {
775 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
776 continue; /* if the pathname is too long, or something went wrong, ignore */
777
778 if (stat(buf, &st) != 0)
779 continue; /* if the lib doesn't exist in *ldpath, look further */
780
781 /* NetBSD doesn't actually do sanity checks, it just loads the file
782 * and if that doesn't work, continues looking in other directories.
783 * This cannot easily be safely emulated, unfortunately. For now,
784 * just assume that if it exists, it's a valid library. */
785
786 return buf;
787 }
788
789 /* not found in any path */
790 return NULL;
791}
792#else
793#ifdef __ELF__
794#warning Cache support not implemented for your target
795#endif
796static char *lookup_cache_lib(elfobj *elf, char *fname)
797{
798 return NULL;
799}
800#endif
801
450static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 802static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
451{ 803{
452 unsigned long i; 804 unsigned long i;
453 char *needed; 805 char *needed;
454 void *strtbl_void; 806 void *strtbl_void;
807 char *p;
455 808
809 /*
810 * -n -> op==0 -> print all
811 * -N -> op==1 -> print requested
812 */
456 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 813 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
814 return NULL;
457 815
458 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 816 strtbl_void = elf_findsecbyname(elf, ".dynstr");
459 817
460 if (elf->phdr && strtbl_void) { 818 if (elf->phdr && strtbl_void) {
461#define SHOW_NEEDED(B) \ 819#define SHOW_NEEDED(B) \
463 Elf ## B ## _Dyn *dyn; \ 821 Elf ## B ## _Dyn *dyn; \
464 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 822 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
465 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 823 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
466 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 824 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
467 Elf ## B ## _Off offset; \ 825 Elf ## B ## _Off offset; \
826 size_t matched = 0; \
827 /* Walk all the program headers to find the PT_DYNAMIC */ \
468 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 828 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
469 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 829 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
830 continue; \
470 offset = EGET(phdr[i].p_offset); \ 831 offset = EGET(phdr[i].p_offset); \
471 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 832 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
833 continue; \
834 /* Walk all the dynamic tags to find NEEDED entries */ \
472 dyn = DYN ## B (elf->data + offset); \ 835 dyn = DYN ## B (elf->vdata + offset); \
473 while (EGET(dyn->d_tag) != DT_NULL) { \ 836 while (EGET(dyn->d_tag) != DT_NULL) { \
474 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 837 if (EGET(dyn->d_tag) == DT_NEEDED) { \
475 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 838 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
476 if (offset >= (Elf ## B ## _Off)elf->len) { \ 839 if (offset >= (Elf ## B ## _Off)elf->len) { \
477 ++dyn; \ 840 ++dyn; \
478 continue; \ 841 continue; \
479 } \ 842 } \
480 needed = (char*)(elf->data + offset); \ 843 needed = elf->data + offset; \
481 if (op == 0) { \ 844 if (op == 0) { \
845 /* -n -> print all entries */ \
482 if (!be_wewy_wewy_quiet) { \ 846 if (!be_wewy_wewy_quiet) { \
483 if (*found_needed) xchrcat(ret, ',', ret_len); \ 847 if (*found_needed) xchrcat(ret, ',', ret_len); \
848 if (use_ldcache) \
849 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
850 needed = p; \
484 xstrcat(ret, needed, ret_len); \ 851 xstrcat(ret, needed, ret_len); \
485 } \ 852 } \
486 *found_needed = 1; \ 853 *found_needed = 1; \
487 } else { \ 854 } else { \
488 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 855 /* -N -> print matching entries */ \
856 size_t n; \
857 const char *find_lib_name; \
858 \
859 array_for_each(find_lib_arr, n, find_lib_name) \
860 if (!strcmp(find_lib_name, needed)) \
861 ++matched; \
862 \
863 if (matched == array_cnt(find_lib_arr)) { \
489 *found_lib = 1; \ 864 *found_lib = 1; \
490 return (be_wewy_wewy_quiet ? NULL : needed); \ 865 return (be_wewy_wewy_quiet ? NULL : find_lib); \
491 } \ 866 } \
492 } \ 867 } \
493 } \ 868 } \
494 ++dyn; \ 869 ++dyn; \
495 } \ 870 } \
524} 899}
525static char *scanelf_file_bind(elfobj *elf, char *found_bind) 900static char *scanelf_file_bind(elfobj *elf, char *found_bind)
526{ 901{
527 unsigned long i; 902 unsigned long i;
528 struct stat s; 903 struct stat s;
904 char dynamic = 0;
529 905
530 if (!show_bind) return NULL; 906 if (!show_bind) return NULL;
531 if (!elf->phdr) return NULL; 907 if (!elf->phdr) return NULL;
532 908
533#define SHOW_BIND(B) \ 909#define SHOW_BIND(B) \
535 Elf ## B ## _Dyn *dyn; \ 911 Elf ## B ## _Dyn *dyn; \
536 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 912 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
537 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 913 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
538 Elf ## B ## _Off offset; \ 914 Elf ## B ## _Off offset; \
539 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 915 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
540 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 916 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
917 dynamic = 1; \
541 offset = EGET(phdr[i].p_offset); \ 918 offset = EGET(phdr[i].p_offset); \
542 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 919 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
543 dyn = DYN ## B (elf->data + offset); \ 920 dyn = DYN ## B (elf->vdata + offset); \
544 while (EGET(dyn->d_tag) != DT_NULL) { \ 921 while (EGET(dyn->d_tag) != DT_NULL) { \
545 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 922 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
546 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 923 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
547 { \ 924 { \
548 if (be_quiet) return NULL; \ 925 if (be_quiet) return NULL; \
556 SHOW_BIND(32) 933 SHOW_BIND(32)
557 SHOW_BIND(64) 934 SHOW_BIND(64)
558 935
559 if (be_wewy_wewy_quiet) return NULL; 936 if (be_wewy_wewy_quiet) return NULL;
560 937
938 /* 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)) { 939 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
562 return NULL; 940 return NULL;
563 } else { 941 } else {
564 *found_bind = 1; 942 *found_bind = 1;
565 return (char *) "LAZY"; 943 return (char *)(dynamic ? "LAZY" : "STATIC");
566 } 944 }
567} 945}
568static char *scanelf_file_soname(elfobj *elf, char *found_soname) 946static char *scanelf_file_soname(elfobj *elf, char *found_soname)
569{ 947{
570 unsigned long i; 948 unsigned long i;
582 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 960 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
583 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 961 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
584 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 962 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
585 Elf ## B ## _Off offset; \ 963 Elf ## B ## _Off offset; \
586 /* only look for soname in shared objects */ \ 964 /* only look for soname in shared objects */ \
587 if (ehdr->e_type != ET_DYN) \ 965 if (EGET(ehdr->e_type) != ET_DYN) \
588 return NULL; \ 966 return NULL; \
589 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 967 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
590 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 968 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
591 offset = EGET(phdr[i].p_offset); \ 969 offset = EGET(phdr[i].p_offset); \
592 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 970 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
593 dyn = DYN ## B (elf->data + offset); \ 971 dyn = DYN ## B (elf->vdata + offset); \
594 while (EGET(dyn->d_tag) != DT_NULL) { \ 972 while (EGET(dyn->d_tag) != DT_NULL) { \
595 if (EGET(dyn->d_tag) == DT_SONAME) { \ 973 if (EGET(dyn->d_tag) == DT_SONAME) { \
596 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 974 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
597 if (offset >= (Elf ## B ## _Off)elf->len) { \ 975 if (offset >= (Elf ## B ## _Off)elf->len) { \
598 ++dyn; \ 976 ++dyn; \
599 continue; \ 977 continue; \
600 } \ 978 } \
601 soname = (char*)(elf->data + offset); \ 979 soname = elf->data + offset; \
602 *found_soname = 1; \ 980 *found_soname = 1; \
603 return (be_wewy_wewy_quiet ? NULL : soname); \ 981 return (be_wewy_wewy_quiet ? NULL : soname); \
604 } \ 982 } \
605 ++dyn; \ 983 ++dyn; \
606 } \ 984 } \
609 SHOW_SONAME(64) 987 SHOW_SONAME(64)
610 } 988 }
611 989
612 return NULL; 990 return NULL;
613} 991}
992
993/*
994 * We support the symbol form:
995 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
996 * If the symbol name is empty, then all symbols are matched.
997 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
998 * Do not rely on this output format at all.
999 * Otherwise the symbol name is used to search (either regex or string compare).
1000 * If the first char of the symbol name is a plus ("+"), then only match
1001 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1002 * Putting modifiers in between the percent signs allows for more in depth
1003 * filters. There are groups of modifiers. If you don't specify a member
1004 * of a group, then all types in that group are matched. The current
1005 * groups and their types are:
1006 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f SST_FILE:F
1007 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1008 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1009 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1010 * You can search for multiple symbols at once by seperating with a comma (",").
1011 *
1012 * Some examples:
1013 * ELFs with a weak function "foo":
1014 * scanelf -s %wf%foo <ELFs>
1015 * ELFs that define the symbol "main":
1016 * scanelf -s +main <ELFs>
1017 * scanelf -s %d%main <ELFs>
1018 * ELFs that refer to the undefined symbol "brk":
1019 * scanelf -s -brk <ELFs>
1020 * scanelf -s %u%brk <ELFs>
1021 * All global defined objects in an ELF:
1022 * scanelf -s %ogd% <ELF>
1023 */
1024static void
1025scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1026 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1027{
1028 char *this_sym, *next_sym, saved = saved;
1029
1030 /* allow the user to specify a comma delimited list of symbols to search for */
1031 next_sym = NULL;
1032 do {
1033 bool inc_notype, inc_object, inc_func, inc_file,
1034 inc_local, inc_global, inc_weak,
1035 inc_def, inc_undef, inc_abs, inc_common;
1036
1037 if (next_sym) {
1038 next_sym[-1] = saved;
1039 this_sym = next_sym;
1040 } else
1041 this_sym = find_sym;
1042 if ((next_sym = strchr(this_sym, ','))) {
1043 /* make parsing easier by killing the comma temporarily */
1044 saved = *next_sym;
1045 *next_sym = '\0';
1046 next_sym += 1;
1047 }
1048
1049 /* symbol selection! */
1050 inc_notype = inc_object = inc_func = inc_file = \
1051 inc_local = inc_global = inc_weak = \
1052 inc_def = inc_undef = inc_abs = inc_common = \
1053 (*this_sym != '%');
1054
1055 /* parse the contents of %...% */
1056 if (!inc_notype) {
1057 while (*(this_sym++)) {
1058 if (*this_sym == '%') {
1059 ++this_sym;
1060 break;
1061 }
1062 switch (*this_sym) {
1063 case 'n': inc_notype = true; break;
1064 case 'o': inc_object = true; break;
1065 case 'f': inc_func = true; break;
1066 case 'F': inc_file = true; break;
1067 case 'l': inc_local = true; break;
1068 case 'g': inc_global = true; break;
1069 case 'w': inc_weak = true; break;
1070 case 'd': inc_def = true; break;
1071 case 'u': inc_undef = true; break;
1072 case 'a': inc_abs = true; break;
1073 case 'c': inc_common = true; break;
1074 default: err("invalid symbol selector '%c'", *this_sym);
1075 }
1076 }
1077
1078 /* If no types are matched, not match all */
1079 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1080 inc_notype = inc_object = inc_func = inc_file = true;
1081 if (!inc_local && !inc_global && !inc_weak)
1082 inc_local = inc_global = inc_weak = true;
1083 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1084 inc_def = inc_undef = inc_abs = inc_common = true;
1085
1086 /* backwards compat for defined/undefined short hand */
1087 } else if (*this_sym == '+') {
1088 inc_undef = false;
1089 ++this_sym;
1090 } else if (*this_sym == '-') {
1091 inc_def = inc_abs = inc_common = false;
1092 ++this_sym;
1093 }
1094
1095 /* filter symbols */
1096 if ((!inc_notype && stt == STT_NOTYPE) || \
1097 (!inc_object && stt == STT_OBJECT) || \
1098 (!inc_func && stt == STT_FUNC ) || \
1099 (!inc_file && stt == STT_FILE ) || \
1100 (!inc_local && stb == STB_LOCAL ) || \
1101 (!inc_global && stb == STB_GLOBAL) || \
1102 (!inc_weak && stb == STB_WEAK ) || \
1103 (!inc_def && shn && shn < SHN_LORESERVE) || \
1104 (!inc_undef && shn == SHN_UNDEF ) || \
1105 (!inc_abs && shn == SHN_ABS ) || \
1106 (!inc_common && shn == SHN_COMMON))
1107 continue;
1108
1109 if (*this_sym == '*') {
1110 /* a "*" symbol gets you debug output */
1111 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1112 ((*found_sym == 0) ? "\n\t" : "\t"),
1113 elf->base_filename,
1114 size,
1115 get_elfstttype(stt),
1116 get_elfstbtype(stb),
1117 get_elfshntype(shn),
1118 symname);
1119 goto matched;
1120
1121 } else {
1122 if (g_match) {
1123 /* regex match the symbol */
1124 if (rematch(this_sym, symname, REG_EXTENDED) != 0)
1125 continue;
1126
1127 } else if (*this_sym) {
1128 /* give empty symbols a "pass", else do a normal compare */
1129 const size_t len = strlen(this_sym);
1130 if (!(strncmp(this_sym, symname, len) == 0 &&
1131 /* Accept unversioned symbol names */
1132 (symname[len] == '\0' || symname[len] == '@')))
1133 continue;
1134 }
1135
1136 if (be_semi_verbose) {
1137 char buf[1024];
1138 snprintf(buf, sizeof(buf), "%lX %s %s",
1139 size,
1140 get_elfstttype(stt),
1141 this_sym);
1142 *ret = xstrdup(buf);
1143 } else {
1144 if (*ret) xchrcat(ret, ',', ret_len);
1145 xstrcat(ret, symname, ret_len);
1146 }
1147
1148 goto matched;
1149 }
1150 } while (next_sym);
1151
1152 return;
1153
1154 matched:
1155 *found_sym = 1;
1156 if (next_sym)
1157 next_sym[-1] = saved;
1158}
1159
614static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1160static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
615{ 1161{
616 unsigned long i; 1162 unsigned long i;
1163 char *ret;
617 void *symtab_void, *strtab_void; 1164 void *symtab_void, *strtab_void;
618 1165
619 if (!find_sym) return NULL; 1166 if (!find_sym) return NULL;
1167 ret = NULL;
620 1168
621 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1169 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
622 1170
623 if (symtab_void && strtab_void) { 1171 if (symtab_void && strtab_void) {
624#define FIND_SYM(B) \ 1172#define FIND_SYM(B) \
625 if (elf->elf_class == ELFCLASS ## B) { \ 1173 if (elf->elf_class == ELFCLASS ## B) { \
626 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1174 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
627 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1175 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
628 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1176 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
629 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1177 unsigned long cnt = EGET(symtab->sh_entsize); \
630 char *symname; \ 1178 char *symname; \
1179 size_t ret_len = 0; \
1180 if (cnt) \
1181 cnt = EGET(symtab->sh_size) / cnt; \
631 for (i = 0; i < cnt; ++i) { \ 1182 for (i = 0; i < cnt; ++i) { \
1183 if ((void*)sym > elf->data_end) { \
1184 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1185 goto break_out; \
1186 } \
632 if (sym->st_name) { \ 1187 if (sym->st_name) { \
1188 /* make sure the symbol name is in acceptable memory range */ \
633 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1189 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
634 if (*find_sym == '*') { \ 1190 if ((void*)symname > elf->data_end) { \
635 printf("%s(%s) %5lX %15s %s\n", \ 1191 warnf("%s: corrupt ELF symbols", elf->filename); \
636 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1192 ++sym; \
637 elf->base_filename, \ 1193 continue; \
638 (long)sym->st_size, \ 1194 } \
639 (char *)get_elfstttype(sym->st_info), \ 1195 scanelf_match_symname(elf, found_sym, \
640 symname); \ 1196 &ret, &ret_len, symname, \
641 *found_sym = 1; \ 1197 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
642 } else if ((strcmp(find_sym, symname) == 0) || \ 1198 ELF##B##_ST_BIND(EGET(sym->st_info)), \
643 (strcmp(symname, versioned_symname) == 0)) \ 1199 EGET(sym->st_shndx), \
644 (*found_sym)++; \ 1200 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1201 EGET(sym->st_size)); \
645 } \ 1202 } \
646 ++sym; \ 1203 ++sym; \
647 } } 1204 } }
648 FIND_SYM(32) 1205 FIND_SYM(32)
649 FIND_SYM(64) 1206 FIND_SYM(64)
650 } 1207 }
651 1208
1209break_out:
652 if (be_wewy_wewy_quiet) return NULL; 1210 if (be_wewy_wewy_quiet) return NULL;
653 1211
654 if (*find_sym != '*' && *found_sym) 1212 if (*find_sym != '*' && *found_sym)
655 return find_sym; 1213 return ret;
656 if (be_quiet) 1214 if (be_quiet)
657 return NULL; 1215 return NULL;
658 else 1216 else
659 return (char *)" - "; 1217 return " - ";
660} 1218}
1219
1220static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1221{
1222 if (!find_section)
1223 return NULL;
1224
1225#define FIND_SECTION(B) \
1226 if (elf->elf_class == ELFCLASS ## B) { \
1227 size_t matched, n; \
1228 int invert; \
1229 const char *section_name; \
1230 Elf ## B ## _Shdr *section; \
1231 \
1232 matched = 0; \
1233 array_for_each(find_section_arr, n, section_name) { \
1234 invert = (*section_name == '!' ? 1 : 0); \
1235 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1236 if ((section == NULL && invert) || (section != NULL && !invert)) \
1237 ++matched; \
1238 } \
1239 \
1240 if (matched == array_cnt(find_section_arr)) \
1241 *found_section = 1; \
1242 }
1243 FIND_SECTION(32)
1244 FIND_SECTION(64)
1245
1246 if (be_wewy_wewy_quiet)
1247 return NULL;
1248
1249 if (*found_section)
1250 return find_section;
1251
1252 if (be_quiet)
1253 return NULL;
1254 else
1255 return " - ";
1256}
1257
661/* scan an elf file and show all the fun stuff */ 1258/* scan an elf file and show all the fun stuff */
662#define prints(str) write(fileno(stdout), str, strlen(str)) 1259#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
663static void scanelf_file(const char *filename) 1260static int scanelf_elfobj(elfobj *elf)
664{ 1261{
665 unsigned long i; 1262 unsigned long i;
666 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1263 char found_pax, found_phdr, found_relro, found_load, found_textrel,
667 found_rpath, found_needed, found_interp, found_bind, found_soname, 1264 found_rpath, found_needed, found_interp, found_bind, found_soname,
668 found_sym, found_lib, found_file, found_textrels; 1265 found_sym, found_lib, found_file, found_textrels, found_section;
669 elfobj *elf;
670 struct stat st;
671 static char *out_buffer = NULL; 1266 static char *out_buffer = NULL;
672 static size_t out_len; 1267 static size_t out_len;
673 1268
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 = \ 1269 found_pax = found_phdr = found_relro = found_load = found_textrel = \
690 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1270 found_rpath = found_needed = found_interp = found_bind = found_soname = \
691 found_sym = found_lib = found_file = found_textrels = 0; 1271 found_sym = found_lib = found_file = found_textrels = found_section = 0;
692 1272
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) 1273 if (be_verbose > 2)
700 printf("%s: scanning file {%s,%s}\n", filename, 1274 printf("%s: scanning file {%s,%s}\n", elf->filename,
701 get_elfeitype(EI_CLASS, elf->elf_class), 1275 get_elfeitype(EI_CLASS, elf->elf_class),
702 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1276 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
703 else if (be_verbose) 1277 else if (be_verbose > 1)
704 printf("%s: scanning file\n", filename); 1278 printf("%s: scanning file\n", elf->filename);
705 1279
706 /* init output buffer */ 1280 /* init output buffer */
707 if (!out_buffer) { 1281 if (!out_buffer) {
708 out_len = sizeof(char) * 80; 1282 out_len = sizeof(char) * 80;
709 out_buffer = (char*)xmalloc(out_len); 1283 out_buffer = xmalloc(out_len);
710 } 1284 }
711 *out_buffer = '\0'; 1285 *out_buffer = '\0';
712 1286
713 /* show the header */ 1287 /* show the header */
714 if (!be_quiet && show_banner) { 1288 if (!be_quiet && show_banner) {
715 for (i = 0; out_format[i]; ++i) { 1289 for (i = 0; out_format[i]; ++i) {
716 if (!IS_MODIFIER(out_format[i])) continue; 1290 if (!IS_MODIFIER(out_format[i])) continue;
717 1291
718 switch (out_format[++i]) { 1292 switch (out_format[++i]) {
1293 case '+': break;
719 case '%': break; 1294 case '%': break;
720 case '#': break; 1295 case '#': break;
721 case 'F': 1296 case 'F':
722 case 'p': 1297 case 'p':
723 case 'f': prints("FILE "); found_file = 1; break; 1298 case 'f': prints("FILE "); found_file = 1; break;
724 case 'o': prints(" TYPE "); break; 1299 case 'o': prints(" TYPE "); break;
725 case 'x': prints(" PAX "); break; 1300 case 'x': prints(" PAX "); break;
726 case 'e': prints("STK/REL/PTL "); break; 1301 case 'e': prints("STK/REL/PTL "); break;
727 case 't': prints("TEXTREL "); break; 1302 case 't': prints("TEXTREL "); break;
728 case 'r': prints("RPATH "); break; 1303 case 'r': prints("RPATH "); break;
1304 case 'M': prints("CLASS "); break;
729 case 'n': prints("NEEDED "); break; 1305 case 'n': prints("NEEDED "); break;
730 case 'i': prints("INTERP "); break; 1306 case 'i': prints("INTERP "); break;
731 case 'b': prints("BIND "); break; 1307 case 'b': prints("BIND "); break;
1308 case 'Z': prints("SIZE "); break;
732 case 'S': prints("SONAME "); break; 1309 case 'S': prints("SONAME "); break;
733 case 's': prints("SYM "); break; 1310 case 's': prints("SYM "); break;
734 case 'N': prints("LIB "); break; 1311 case 'N': prints("LIB "); break;
735 case 'T': prints("TEXTRELS "); break; 1312 case 'T': prints("TEXTRELS "); break;
1313 case 'k': prints("SECTION "); break;
1314 case 'a': prints("ARCH "); break;
1315 case 'I': prints("OSABI "); break;
1316 case 'Y': prints("EABI "); break;
1317 case 'O': prints("PERM "); break;
1318 case 'D': prints("ENDIAN "); break;
736 default: warnf("'%c' has no title ?", out_format[i]); 1319 default: warnf("'%c' has no title ?", out_format[i]);
737 } 1320 }
738 } 1321 }
739 if (!found_file) prints("FILE "); 1322 if (!found_file) prints("FILE ");
740 prints("\n"); 1323 prints("\n");
744 1327
745 /* dump all the good stuff */ 1328 /* dump all the good stuff */
746 for (i = 0; out_format[i]; ++i) { 1329 for (i = 0; out_format[i]; ++i) {
747 const char *out; 1330 const char *out;
748 const char *tmp; 1331 const char *tmp;
749 1332 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])) { 1333 if (!IS_MODIFIER(out_format[i])) {
755 xchrcat(&out_buffer, out_format[i], &out_len); 1334 xchrcat(&out_buffer, out_format[i], &out_len);
756 continue; 1335 continue;
757 } 1336 }
758 1337
759 out = NULL; 1338 out = NULL;
760 be_wewy_wewy_quiet = (out_format[i] == '#'); 1339 be_wewy_wewy_quiet = (out_format[i] == '#');
1340 be_semi_verbose = (out_format[i] == '+');
761 switch (out_format[++i]) { 1341 switch (out_format[++i]) {
1342 case '+':
762 case '%': 1343 case '%':
763 case '#': 1344 case '#':
764 xchrcat(&out_buffer, out_format[i], &out_len); break; 1345 xchrcat(&out_buffer, out_format[i], &out_len); break;
765 case 'F': 1346 case 'F':
766 found_file = 1; 1347 found_file = 1;
767 if (be_wewy_wewy_quiet) break; 1348 if (be_wewy_wewy_quiet) break;
768 xstrcat(&out_buffer, filename, &out_len); 1349 xstrcat(&out_buffer, elf->filename, &out_len);
769 break; 1350 break;
770 case 'p': 1351 case 'p':
771 found_file = 1; 1352 found_file = 1;
772 if (be_wewy_wewy_quiet) break; 1353 if (be_wewy_wewy_quiet) break;
773 tmp = filename; 1354 tmp = elf->filename;
774 if (search_path) { 1355 if (search_path) {
775 ssize_t len_search = strlen(search_path); 1356 ssize_t len_search = strlen(search_path);
776 ssize_t len_file = strlen(filename); 1357 ssize_t len_file = strlen(elf->filename);
777 if (!strncmp(filename, search_path, len_search) && \ 1358 if (!strncmp(elf->filename, search_path, len_search) && \
778 len_file > len_search) 1359 len_file > len_search)
779 tmp += len_search; 1360 tmp += len_search;
780 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1361 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
781 } 1362 }
782 xstrcat(&out_buffer, tmp, &out_len); 1363 xstrcat(&out_buffer, tmp, &out_len);
783 break; 1364 break;
784 case 'f': 1365 case 'f':
785 found_file = 1; 1366 found_file = 1;
786 if (be_wewy_wewy_quiet) break; 1367 if (be_wewy_wewy_quiet) break;
787 tmp = strrchr(filename, '/'); 1368 tmp = strrchr(elf->filename, '/');
788 tmp = (tmp == NULL ? filename : tmp+1); 1369 tmp = (tmp == NULL ? elf->filename : tmp+1);
789 xstrcat(&out_buffer, tmp, &out_len); 1370 xstrcat(&out_buffer, tmp, &out_len);
790 break; 1371 break;
791 case 'o': out = get_elfetype(elf); break; 1372 case 'o': out = get_elfetype(elf); break;
792 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1373 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; 1374 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; 1375 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
795 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1376 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; 1377 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1378 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1379 case 'D': out = get_endian(elf); break;
1380 case 'O': out = strfileperms(elf->filename); break;
797 case 'n': 1381 case 'n':
798 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1382 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; 1383 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
800 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1384 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
801 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1385 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
802 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1386 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1387 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1388 case 'a': out = get_elfemtype(elf); break;
1389 case 'I': out = get_elfosabi(elf); break;
1390 case 'Y': out = get_elf_eabi(elf); break;
1391 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]); 1392 default: warnf("'%c' has no scan code?", out_format[i]);
804 } 1393 }
1394 if (out)
805 if (out) xstrcat(&out_buffer, out, &out_len); 1395 xstrcat(&out_buffer, out, &out_len);
806 } 1396 }
807 1397
808#define FOUND_SOMETHING() \ 1398#define FOUND_SOMETHING() \
809 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1399 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
810 found_rpath || found_needed || found_interp || found_bind || \ 1400 found_rpath || found_needed || found_interp || found_bind || \
811 found_soname || found_sym || found_lib || found_textrels) 1401 found_soname || found_sym || found_lib || found_textrels || found_section )
812 1402
813 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1403 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
814 xchrcat(&out_buffer, ' ', &out_len); 1404 xchrcat(&out_buffer, ' ', &out_len);
815 xstrcat(&out_buffer, filename, &out_len); 1405 xstrcat(&out_buffer, elf->filename, &out_len);
816 } 1406 }
817 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1407 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
818 puts(out_buffer); 1408 puts(out_buffer);
819 fflush(stdout); 1409 fflush(stdout);
820 } 1410 }
821 1411
1412 return 0;
1413}
1414
1415/* scan a single elf */
1416static int scanelf_elf(const char *filename, int fd, size_t len)
1417{
1418 int ret = 1;
1419 elfobj *elf;
1420
1421 /* verify this is real ELF */
1422 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1423 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1424 return ret;
1425 }
1426 switch (match_bits) {
1427 case 32:
1428 if (elf->elf_class != ELFCLASS32)
1429 goto label_done;
1430 break;
1431 case 64:
1432 if (elf->elf_class != ELFCLASS64)
1433 goto label_done;
1434 break;
1435 default: break;
1436 }
1437 if (match_etypes) {
1438 char sbuf[126];
1439 strncpy(sbuf, match_etypes, sizeof(sbuf));
1440 if (strchr(match_etypes, ',') != NULL) {
1441 char *p;
1442 while ((p = strrchr(sbuf, ',')) != NULL) {
1443 *p = 0;
1444 if (etype_lookup(p+1) == get_etype(elf))
1445 goto label_ret;
1446 }
1447 }
1448 if (etype_lookup(sbuf) != get_etype(elf))
1449 goto label_done;
1450 }
1451
1452label_ret:
1453 ret = scanelf_elfobj(elf);
1454
1455label_done:
822 unreadelf(elf); 1456 unreadelf(elf);
1457 return ret;
1458}
1459
1460/* scan an archive of elfs */
1461static int scanelf_archive(const char *filename, int fd, size_t len)
1462{
1463 archive_handle *ar;
1464 archive_member *m;
1465 char *ar_buffer;
1466 elfobj *elf;
1467
1468 ar = ar_open_fd(filename, fd);
1469 if (ar == NULL)
1470 return 1;
1471
1472 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1473 while ((m = ar_next(ar)) != NULL) {
1474 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1475 if (cur_pos == -1)
1476 errp("lseek() failed");
1477 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1478 if (elf) {
1479 scanelf_elfobj(elf);
1480 unreadelf(elf);
1481 }
1482 }
1483 munmap(ar_buffer, len);
1484
1485 return 0;
1486}
1487/* scan a file which may be an elf or an archive or some other magical beast */
1488static int scanelf_file(const char *filename, const struct stat *st_cache)
1489{
1490 const struct stat *st = st_cache;
1491 struct stat symlink_st;
1492 int fd;
1493
1494 /* always handle regular files and handle symlinked files if no -y */
1495 if (S_ISLNK(st->st_mode)) {
1496 if (!scan_symlink) return 1;
1497 stat(filename, &symlink_st);
1498 st = &symlink_st;
1499 }
1500
1501 if (!S_ISREG(st->st_mode)) {
1502 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1503 return 1;
1504 }
1505
1506 if (match_perms) {
1507 if ((st->st_mode | match_perms) != st->st_mode)
1508 return 1;
1509 }
1510 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1511 return 1;
1512
1513 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1514 /* if it isn't an ELF, maybe it's an .a archive */
1515 scanelf_archive(filename, fd, st->st_size);
1516
1517 close(fd);
1518 return 0;
1519}
1520
1521static const char *maybe_add_root(const char *fname, char *buf)
1522{
1523 if (root && strncmp(fname, root, strlen(root))) {
1524 strcpy(buf, root);
1525 strncat(buf, fname, __PAX_UTILS_PATH_MAX - strlen(root) - 1);
1526 fname = buf;
1527 }
1528 return fname;
823} 1529}
824 1530
825/* scan a directory for ET_EXEC files and print when we find one */ 1531/* scan a directory for ET_EXEC files and print when we find one */
826static void scanelf_dir(const char *path) 1532static int scanelf_dir(const char *path)
827{ 1533{
828 register DIR *dir; 1534 register DIR *dir;
829 register struct dirent *dentry; 1535 register struct dirent *dentry;
830 struct stat st_top, st; 1536 struct stat st_top, st;
831 char buf[_POSIX_PATH_MAX]; 1537 char buf[__PAX_UTILS_PATH_MAX];
1538 char _path[__PAX_UTILS_PATH_MAX];
832 size_t pathlen = 0, len = 0; 1539 size_t pathlen = 0, len = 0;
1540 int ret = 0;
1541
1542 path = maybe_add_root(path, _path);
833 1543
834 /* make sure path exists */ 1544 /* make sure path exists */
835 if (lstat(path, &st_top) == -1) { 1545 if (lstat(path, &st_top) == -1) {
836 if (be_verbose > 2) printf("%s: does not exist\n", path); 1546 if (be_verbose > 2) printf("%s: does not exist\n", path);
837 return; 1547 return 1;
838 } 1548 }
839 1549
840 /* ok, if it isn't a directory, assume we can open it */ 1550 /* ok, if it isn't a directory, assume we can open it */
841 if (!S_ISDIR(st_top.st_mode)) { 1551 if (!S_ISDIR(st_top.st_mode)) {
842 scanelf_file(path); 1552 return scanelf_file(path, &st_top);
843 return;
844 } 1553 }
845 1554
846 /* now scan the dir looking for fun stuff */ 1555 /* now scan the dir looking for fun stuff */
847 if ((dir = opendir(path)) == NULL) { 1556 if ((dir = opendir(path)) == NULL) {
848 warnf("could not opendir %s: %s", path, strerror(errno)); 1557 warnf("could not opendir %s: %s", path, strerror(errno));
849 return; 1558 return 1;
850 } 1559 }
851 if (be_verbose) printf("%s: scanning dir\n", path); 1560 if (be_verbose > 1) printf("%s: scanning dir\n", path);
852 1561
853 pathlen = strlen(path); 1562 pathlen = strlen(path);
854 while ((dentry = readdir(dir))) { 1563 while ((dentry = readdir(dir))) {
855 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1564 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
856 continue; 1565 continue;
858 if (len >= sizeof(buf)) { 1567 if (len >= sizeof(buf)) {
859 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1568 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
860 (unsigned long)len, (unsigned long)sizeof(buf)); 1569 (unsigned long)len, (unsigned long)sizeof(buf));
861 continue; 1570 continue;
862 } 1571 }
863 sprintf(buf, "%s/%s", path, dentry->d_name); 1572 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
864 if (lstat(buf, &st) != -1) { 1573 if (lstat(buf, &st) != -1) {
865 if (S_ISREG(st.st_mode)) 1574 if (S_ISREG(st.st_mode))
866 scanelf_file(buf); 1575 ret = scanelf_file(buf, &st);
867 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1576 else if (dir_recurse && S_ISDIR(st.st_mode)) {
868 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1577 if (dir_crossmount || (st_top.st_dev == st.st_dev))
869 scanelf_dir(buf); 1578 ret = scanelf_dir(buf);
870 } 1579 }
871 } 1580 }
872 } 1581 }
873 closedir(dir); 1582 closedir(dir);
1583 return ret;
874} 1584}
875 1585
876static int scanelf_from_file(char *filename) 1586static int scanelf_from_file(const char *filename)
877{ 1587{
878 FILE *fp = NULL; 1588 FILE *fp = NULL;
879 char *p; 1589 char *p;
880 char path[_POSIX_PATH_MAX]; 1590 char path[__PAX_UTILS_PATH_MAX];
1591 int ret = 0;
881 1592
882 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1593 if (strcmp(filename, "-") == 0)
883 fp = stdin; 1594 fp = stdin;
884 else if ((fp = fopen(filename, "r")) == NULL) 1595 else if ((fp = fopen(filename, "r")) == NULL)
885 return 1; 1596 return 1;
886 1597
887 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1598 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
888 if ((p = strchr(path, '\n')) != NULL) 1599 if ((p = strchr(path, '\n')) != NULL)
889 *p = 0; 1600 *p = 0;
890 search_path = path; 1601 search_path = path;
891 scanelf_dir(path); 1602 ret = scanelf_dir(path);
892 } 1603 }
893 if (fp != stdin) 1604 if (fp != stdin)
894 fclose(fp); 1605 fclose(fp);
895 return 0; 1606 return ret;
896} 1607}
897 1608
898static void load_ld_so_conf() 1609#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1610
1611static int load_ld_cache_config(int i, const char *fname)
899{ 1612{
900 FILE *fp = NULL; 1613 FILE *fp = NULL;
901 char *p; 1614 char *p;
902 char path[_POSIX_PATH_MAX]; 1615 char path[__PAX_UTILS_PATH_MAX];
903 int i = 0; 1616 char _fname[__PAX_UTILS_PATH_MAX];
904 1617
1618 fname = maybe_add_root(fname, _fname);
1619
905 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1620 if ((fp = fopen(fname, "r")) == NULL)
906 return; 1621 return i;
907 1622
908 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1623 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
909 if (*path != '/')
910 continue;
911
912 if ((p = strrchr(path, '\r')) != NULL) 1624 if ((p = strrchr(path, '\r')) != NULL)
913 *p = 0; 1625 *p = 0;
914 if ((p = strchr(path, '\n')) != NULL) 1626 if ((p = strchr(path, '\n')) != NULL)
915 *p = 0; 1627 *p = 0;
916 1628
917 ldpaths[i++] = xstrdup(path); 1629 /* recursive includes of the same file will make this segfault. */
1630 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1631 glob_t gl;
1632 size_t x;
1633 char gpath[__PAX_UTILS_PATH_MAX];
918 1634
919 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1635 memset(gpath, 0, sizeof(gpath));
920 break; 1636 if (root)
1637 strcpy(gpath, root);
1638
1639 if (path[8] != '/')
1640 snprintf(gpath+strlen(gpath), sizeof(gpath)-strlen(gpath), "/etc/%s", &path[8]);
1641 else
1642 strncpy(gpath+strlen(gpath), &path[8], sizeof(gpath)-strlen(gpath));
1643
1644 if (glob(gpath, 0, NULL, &gl) == 0) {
1645 for (x = 0; x < gl.gl_pathc; ++x) {
1646 /* try to avoid direct loops */
1647 if (strcmp(gl.gl_pathv[x], fname) == 0)
1648 continue;
1649 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1650 }
1651 globfree(&gl);
1652 continue;
1653 }
921 } 1654 }
922 ldpaths[i] = NULL; 1655
1656 if (*path != '/')
1657 continue;
1658
1659 xarraypush(ldpaths, path, strlen(path));
1660 }
923 1661
924 fclose(fp); 1662 fclose(fp);
1663 return i;
925} 1664}
1665
1666#elif defined(__FreeBSD__) || defined(__DragonFly__)
1667
1668static int load_ld_cache_config(int i, const char *fname)
1669{
1670 FILE *fp = NULL;
1671 char *b = NULL, *p;
1672 struct elfhints_hdr hdr;
1673 char _fname[__PAX_UTILS_PATH_MAX];
1674
1675 fname = maybe_add_root(fname, _fname);
1676
1677 if ((fp = fopen(fname, "r")) == NULL)
1678 return i;
1679
1680 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1681 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1682 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1683 {
1684 fclose(fp);
1685 return i;
1686 }
1687
1688 b = xmalloc(hdr.dirlistlen + 1);
1689 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1690 fclose(fp);
1691 free(b);
1692 return i;
1693 }
1694
1695 while ((p = strsep(&b, ":"))) {
1696 if (*p == '\0')
1697 continue;
1698 xarraypush(ldpaths, p, strlen(p));
1699 }
1700
1701 free(b);
1702 fclose(fp);
1703 return i;
1704}
1705
1706#else
1707#ifdef __ELF__
1708#warning Cache config support not implemented for your target
1709#endif
1710static int load_ld_cache_config(int i, const char *fname)
1711{
1712 return 0;
1713}
1714#endif
926 1715
927/* scan /etc/ld.so.conf for paths */ 1716/* scan /etc/ld.so.conf for paths */
928static void scanelf_ldpath() 1717static void scanelf_ldpath(void)
929{ 1718{
930 char scan_l, scan_ul, scan_ull; 1719 char scan_l, scan_ul, scan_ull;
1720 size_t n;
1721 const char *ldpath;
931 int i = 0; 1722 int i = 0;
932 1723
933 if (!ldpaths[0]) 1724 if (array_cnt(ldpaths) == 0)
934 err("Unable to load any paths from ld.so.conf"); 1725 err("Unable to load any paths from ld.so.conf");
935 1726
936 scan_l = scan_ul = scan_ull = 0; 1727 scan_l = scan_ul = scan_ull = 0;
937 1728
938 while (ldpaths[i]) { 1729 array_for_each(ldpaths, n, ldpath) {
939 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1; 1730 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = 1;
940 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1; 1731 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = 1;
941 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1; 1732 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = 1;
942 scanelf_dir(ldpaths[i]); 1733 scanelf_dir(ldpath);
943 ++i; 1734 ++i;
944 } 1735 }
945 1736
946 if (!scan_l) scanelf_dir("/lib"); 1737 if (!scan_l) scanelf_dir("/lib");
947 if (!scan_ul) scanelf_dir("/usr/lib"); 1738 if (!scan_ul) scanelf_dir("/usr/lib");
948 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1739 if (!scan_ull) scanelf_dir("/usr/local/lib");
949} 1740}
950 1741
951/* scan env PATH for paths */ 1742/* scan env PATH for paths */
952static void scanelf_envpath() 1743static void scanelf_envpath(void)
953{ 1744{
954 char *path, *p; 1745 char *path, *p;
955 1746
956 path = getenv("PATH"); 1747 path = getenv("PATH");
957 if (!path) 1748 if (!path)
964 } 1755 }
965 1756
966 free(path); 1757 free(path);
967} 1758}
968 1759
969 1760/* 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" 1761#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
973#define a_argument required_argument 1762#define a_argument required_argument
974static struct option const long_opts[] = { 1763static struct option const long_opts[] = {
975 {"path", no_argument, NULL, 'p'}, 1764 {"path", no_argument, NULL, 'p'},
976 {"ldpath", no_argument, NULL, 'l'}, 1765 {"ldpath", no_argument, NULL, 'l'},
1766 {"root", a_argument, NULL, 128},
977 {"recursive", no_argument, NULL, 'R'}, 1767 {"recursive", no_argument, NULL, 'R'},
978 {"mount", no_argument, NULL, 'm'}, 1768 {"mount", no_argument, NULL, 'm'},
979 {"symlink", no_argument, NULL, 'y'}, 1769 {"symlink", no_argument, NULL, 'y'},
1770 {"archives", no_argument, NULL, 'A'},
1771 {"ldcache", no_argument, NULL, 'L'},
1772 {"fix", no_argument, NULL, 'X'},
1773 {"setpax", a_argument, NULL, 'z'},
980 {"pax", no_argument, NULL, 'x'}, 1774 {"pax", no_argument, NULL, 'x'},
981 {"header", no_argument, NULL, 'e'}, 1775 {"header", no_argument, NULL, 'e'},
982 {"textrel", no_argument, NULL, 't'}, 1776 {"textrel", no_argument, NULL, 't'},
983 {"rpath", no_argument, NULL, 'r'}, 1777 {"rpath", no_argument, NULL, 'r'},
984 {"needed", no_argument, NULL, 'n'}, 1778 {"needed", no_argument, NULL, 'n'},
985 {"interp", no_argument, NULL, 'i'}, 1779 {"interp", no_argument, NULL, 'i'},
986 {"bind", no_argument, NULL, 'b'}, 1780 {"bind", no_argument, NULL, 'b'},
987 {"soname", no_argument, NULL, 'S'}, 1781 {"soname", no_argument, NULL, 'S'},
988 {"symbol", a_argument, NULL, 's'}, 1782 {"symbol", a_argument, NULL, 's'},
1783 {"section", a_argument, NULL, 'k'},
989 {"lib", a_argument, NULL, 'N'}, 1784 {"lib", a_argument, NULL, 'N'},
990 {"gmatch", no_argument, NULL, 'g'}, 1785 {"gmatch", no_argument, NULL, 'g'},
991 {"textrels", no_argument, NULL, 'T'}, 1786 {"textrels", no_argument, NULL, 'T'},
1787 {"etype", a_argument, NULL, 'E'},
1788 {"bits", a_argument, NULL, 'M'},
1789 {"endian", no_argument, NULL, 'D'},
1790 {"osabi", no_argument, NULL, 'I'},
1791 {"eabi", no_argument, NULL, 'Y'},
1792 {"perms", a_argument, NULL, 'O'},
1793 {"size", no_argument, NULL, 'Z'},
992 {"all", no_argument, NULL, 'a'}, 1794 {"all", no_argument, NULL, 'a'},
993 {"quiet", no_argument, NULL, 'q'}, 1795 {"quiet", no_argument, NULL, 'q'},
994 {"verbose", no_argument, NULL, 'v'}, 1796 {"verbose", no_argument, NULL, 'v'},
995 {"format", a_argument, NULL, 'F'}, 1797 {"format", a_argument, NULL, 'F'},
996 {"from", a_argument, NULL, 'f'}, 1798 {"from", a_argument, NULL, 'f'},
997 {"file", a_argument, NULL, 'o'}, 1799 {"file", a_argument, NULL, 'o'},
1800 {"nocolor", no_argument, NULL, 'C'},
998 {"nobanner", no_argument, NULL, 'B'}, 1801 {"nobanner", no_argument, NULL, 'B'},
999 {"help", no_argument, NULL, 'h'}, 1802 {"help", no_argument, NULL, 'h'},
1000 {"version", no_argument, NULL, 'V'}, 1803 {"version", no_argument, NULL, 'V'},
1001 {NULL, no_argument, NULL, 0x0} 1804 {NULL, no_argument, NULL, 0x0}
1002}; 1805};
1003 1806
1004static const char *opts_help[] = { 1807static const char * const opts_help[] = {
1005 "Scan all directories in PATH environment", 1808 "Scan all directories in PATH environment",
1006 "Scan all directories in /etc/ld.so.conf", 1809 "Scan all directories in /etc/ld.so.conf",
1810 "Root directory (use with -l or -p)",
1007 "Scan directories recursively", 1811 "Scan directories recursively",
1008 "Don't recursively cross mount points", 1812 "Don't recursively cross mount points",
1009 "Don't scan symlinks\n", 1813 "Don't scan symlinks",
1814 "Scan archives (.a files)",
1815 "Utilize ld.so.cache information (use with -r/-n)",
1816 "Try and 'fix' bad things (use with -r/-e)",
1817 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1010 "Print PaX markings", 1818 "Print PaX markings",
1011 "Print GNU_STACK/PT_LOAD markings", 1819 "Print GNU_STACK/PT_LOAD markings",
1012 "Print TEXTREL information", 1820 "Print TEXTREL information",
1013 "Print RPATH information", 1821 "Print RPATH information",
1014 "Print NEEDED information", 1822 "Print NEEDED information",
1015 "Print INTERP information", 1823 "Print INTERP information",
1016 "Print BIND information", 1824 "Print BIND information",
1017 "Print SONAME information", 1825 "Print SONAME information",
1018 "Find a specified symbol", 1826 "Find a specified symbol",
1827 "Find a specified section",
1019 "Find a specified library", 1828 "Find a specified library",
1020 "Use strncmp to match libraries. (use with -N)", 1829 "Use regex matching rather than string compare (use with -s)",
1021 "Locate cause of TEXTREL", 1830 "Locate cause of TEXTREL",
1022 "Print all scanned info (-x -e -t -r -b)\n", 1831 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1832 "Print only ELF files matching numeric bits",
1833 "Print Endianness",
1834 "Print OSABI",
1835 "Print EABI (EM_ARM Only)",
1836 "Print only ELF files matching octal permissions",
1837 "Print ELF file size",
1838 "Print all useful/simple info\n",
1023 "Only output 'bad' things", 1839 "Only output 'bad' things",
1024 "Be verbose (can be specified more than once)", 1840 "Be verbose (can be specified more than once)",
1025 "Use specified format for output", 1841 "Use specified format for output",
1026 "Read input stream from a filename", 1842 "Read input stream from a filename",
1027 "Write output stream to a filename", 1843 "Write output stream to a filename",
1844 "Don't emit color in output",
1028 "Don't display the header", 1845 "Don't display the header",
1029 "Print this help and exit", 1846 "Print this help and exit",
1030 "Print version and exit", 1847 "Print version and exit",
1031 NULL 1848 NULL
1032}; 1849};
1034/* display usage and exit */ 1851/* display usage and exit */
1035static void usage(int status) 1852static void usage(int status)
1036{ 1853{
1037 unsigned long i; 1854 unsigned long i;
1038 printf("* Scan ELF binaries for stuff\n\n" 1855 printf("* Scan ELF binaries for stuff\n\n"
1039 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1856 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1040 printf("Options: -[%s]\n", PARSE_FLAGS); 1857 printf("Options: -[%s]\n", PARSE_FLAGS);
1041 for (i = 0; long_opts[i].name; ++i) 1858 for (i = 0; long_opts[i].name; ++i)
1042 if (long_opts[i].has_arg == no_argument) 1859 if (long_opts[i].has_arg == no_argument)
1043 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 1860 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1861 long_opts[i].name, opts_help[i]);
1862 else if (long_opts[i].val > '~')
1863 printf(" --%-7s <arg> * %s\n",
1044 long_opts[i].name, opts_help[i]); 1864 long_opts[i].name, opts_help[i]);
1045 else 1865 else
1046 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 1866 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1047 long_opts[i].name, opts_help[i]); 1867 long_opts[i].name, opts_help[i]);
1048 1868
1049 if (status != EXIT_SUCCESS) 1869 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); 1870 exit(status);
1063} 1871}
1064 1872
1065/* parse command line arguments and preform needed actions */ 1873/* parse command line arguments and preform needed actions */
1874#define do_pax_state(option, flag) \
1875 if (islower(option)) { \
1876 flags &= ~PF_##flag; \
1877 flags |= PF_NO##flag; \
1878 } else { \
1879 flags &= ~PF_NO##flag; \
1880 flags |= PF_##flag; \
1881 }
1066static void parseargs(int argc, char *argv[]) 1882static int parseargs(int argc, char *argv[])
1067{ 1883{
1068 int i; 1884 int i;
1069 char *from_file = NULL; 1885 const char *from_file = NULL;
1886 int ret = 0;
1070 1887
1071 opterr = 0; 1888 opterr = 0;
1072 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1889 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1073 switch (i) { 1890 switch (i) {
1074 1891
1078 VERSION, __FILE__, __DATE__, rcsid, argv0); 1895 VERSION, __FILE__, __DATE__, rcsid, argv0);
1079 exit(EXIT_SUCCESS); 1896 exit(EXIT_SUCCESS);
1080 break; 1897 break;
1081 case 'h': usage(EXIT_SUCCESS); break; 1898 case 'h': usage(EXIT_SUCCESS); break;
1082 case 'f': 1899 case 'f':
1083 if (from_file) err("Don't specify -f twice"); 1900 if (from_file) warn("You prob don't want to specify -f twice");
1084 from_file = xstrdup(optarg); 1901 from_file = optarg;
1902 break;
1903 case 'E':
1904 match_etypes = optarg;
1905 break;
1906 case 'M':
1907 match_bits = atoi(optarg);
1908 if (match_bits == 0) {
1909 if (strcmp(optarg, "ELFCLASS32") == 0)
1910 match_bits = 32;
1911 if (strcmp(optarg, "ELFCLASS64") == 0)
1912 match_bits = 64;
1913 }
1914 break;
1915 case 'O':
1916 if (sscanf(optarg, "%o", &match_perms) == -1)
1917 match_bits = 0;
1085 break; 1918 break;
1086 case 'o': { 1919 case 'o': {
1087 FILE *fp = NULL;
1088 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1920 if (freopen(optarg, "w", stdout) == NULL)
1089 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1921 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1090 SET_STDOUT(fp);
1091 break; 1922 break;
1092 } 1923 }
1093 1924 case 'k':
1925 xarraypush(find_section_arr, optarg, strlen(optarg));
1926 break;
1094 case 's': { 1927 case 's': {
1095 size_t len;
1096 if (find_sym) err("Don't specify -s twice"); 1928 if (find_sym) warn("You prob don't want to specify -s twice");
1097 find_sym = xstrdup(optarg); 1929 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; 1930 break;
1102 } 1931 }
1103 case 'N': { 1932 case 'N':
1104 if (find_lib) err("Don't specify -N twice"); 1933 xarraypush(find_lib_arr, optarg, strlen(optarg));
1105 find_lib = xstrdup(optarg);
1106 break; 1934 break;
1107 }
1108
1109 case 'F': { 1935 case 'F': {
1110 if (out_format) err("Don't specify -F twice"); 1936 if (out_format) warn("You prob don't want to specify -F twice");
1111 out_format = xstrdup(optarg); 1937 out_format = optarg;
1112 break; 1938 break;
1113 } 1939 }
1940 case 'z': {
1941 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1942 size_t x;
1114 1943
1944 for (x = 0; x < strlen(optarg); x++) {
1945 switch (optarg[x]) {
1946 case 'p':
1947 case 'P':
1948 do_pax_state(optarg[x], PAGEEXEC);
1949 break;
1950 case 's':
1951 case 'S':
1952 do_pax_state(optarg[x], SEGMEXEC);
1953 break;
1954 case 'm':
1955 case 'M':
1956 do_pax_state(optarg[x], MPROTECT);
1957 break;
1958 case 'e':
1959 case 'E':
1960 do_pax_state(optarg[x], EMUTRAMP);
1961 break;
1962 case 'r':
1963 case 'R':
1964 do_pax_state(optarg[x], RANDMMAP);
1965 break;
1966 case 'x':
1967 case 'X':
1968 do_pax_state(optarg[x], RANDEXEC);
1969 break;
1970 default:
1971 break;
1972 }
1973 }
1974 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1975 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1976 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1977 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1978 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1979 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1980 setpax = flags;
1981 break;
1982 }
1983 case 'Z': show_size = 1; break;
1115 case 'g': gmatch = 1; 1984 case 'g': g_match = 1; break;
1985 case 'L': use_ldcache = 1; break;
1116 case 'y': scan_symlink = 0; break; 1986 case 'y': scan_symlink = 0; break;
1987 case 'A': scan_archives = 1; break;
1988 case 'C': color_init(true); break;
1117 case 'B': show_banner = 0; break; 1989 case 'B': show_banner = 0; break;
1118 case 'l': scan_ldpath = 1; break; 1990 case 'l': scan_ldpath = 1; break;
1119 case 'p': scan_envpath = 1; break; 1991 case 'p': scan_envpath = 1; break;
1120 case 'R': dir_recurse = 1; break; 1992 case 'R': dir_recurse = 1; break;
1121 case 'm': dir_crossmount = 0; break; 1993 case 'm': dir_crossmount = 0; break;
1994 case 'X': ++fix_elf; break;
1122 case 'x': show_pax = 1; break; 1995 case 'x': show_pax = 1; break;
1123 case 'e': show_phdr = 1; break; 1996 case 'e': show_phdr = 1; break;
1124 case 't': show_textrel = 1; break; 1997 case 't': show_textrel = 1; break;
1125 case 'r': show_rpath = 1; break; 1998 case 'r': show_rpath = 1; break;
1126 case 'n': show_needed = 1; break; 1999 case 'n': show_needed = 1; break;
1128 case 'b': show_bind = 1; break; 2001 case 'b': show_bind = 1; break;
1129 case 'S': show_soname = 1; break; 2002 case 'S': show_soname = 1; break;
1130 case 'T': show_textrels = 1; break; 2003 case 'T': show_textrels = 1; break;
1131 case 'q': be_quiet = 1; break; 2004 case 'q': be_quiet = 1; break;
1132 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2005 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1133 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 2006 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1134 2007 case 'D': show_endian = 1; break;
2008 case 'I': show_osabi = 1; break;
2009 case 'Y': show_eabi = 1; break;
2010 case 128:
2011 root = optarg;
2012 break;
1135 case ':': 2013 case ':':
1136 err("Option missing parameter\n"); 2014 err("Option '%c' is missing parameter", optopt);
1137 case '?': 2015 case '?':
1138 err("Unknown option\n"); 2016 err("Unknown option '%c' or argument missing", optopt);
1139 default: 2017 default:
1140 err("Unhandled option '%c'", i); 2018 err("Unhandled option '%c'; please report this", i);
1141 }
1142 } 2019 }
1143 2020 }
2021 if (show_textrels && be_verbose) {
2022 if (which("objdump") != NULL)
2023 has_objdump = 1;
2024 }
2025 /* flatten arrays for display */
2026 if (array_cnt(find_lib_arr))
2027 find_lib = array_flatten_str(find_lib_arr);
2028 if (array_cnt(find_section_arr))
2029 find_section = array_flatten_str(find_section_arr);
1144 /* let the format option override all other options */ 2030 /* let the format option override all other options */
1145 if (out_format) { 2031 if (out_format) {
1146 show_pax = show_phdr = show_textrel = show_rpath = \ 2032 show_pax = show_phdr = show_textrel = show_rpath = \
1147 show_needed = show_interp = show_bind = show_soname = \ 2033 show_needed = show_interp = show_bind = show_soname = \
1148 show_textrels = 0; 2034 show_textrels = show_perms = show_endian = show_size = \
2035 show_osabi = show_eabi = 0;
1149 for (i = 0; out_format[i]; ++i) { 2036 for (i = 0; out_format[i]; ++i) {
1150 if (!IS_MODIFIER(out_format[i])) continue; 2037 if (!IS_MODIFIER(out_format[i])) continue;
1151 2038
1152 switch (out_format[++i]) { 2039 switch (out_format[++i]) {
2040 case '+': break;
1153 case '%': break; 2041 case '%': break;
1154 case '#': break; 2042 case '#': break;
1155 case 'F': break; 2043 case 'F': break;
1156 case 'p': break; 2044 case 'p': break;
1157 case 'f': break; 2045 case 'f': break;
2046 case 'k': break;
1158 case 's': break; 2047 case 's': break;
1159 case 'N': break; 2048 case 'N': break;
1160 case 'o': break; 2049 case 'o': break;
2050 case 'a': break;
2051 case 'M': break;
2052 case 'Z': show_size = 1; break;
2053 case 'D': show_endian = 1; break;
2054 case 'I': show_osabi = 1; break;
2055 case 'Y': show_eabi = 1; break;
2056 case 'O': show_perms = 1; break;
1161 case 'x': show_pax = 1; break; 2057 case 'x': show_pax = 1; break;
1162 case 'e': show_phdr = 1; break; 2058 case 'e': show_phdr = 1; break;
1163 case 't': show_textrel = 1; break; 2059 case 't': show_textrel = 1; break;
1164 case 'r': show_rpath = 1; break; 2060 case 'r': show_rpath = 1; break;
1165 case 'n': show_needed = 1; break; 2061 case 'n': show_needed = 1; break;
1166 case 'i': show_interp = 1; break; 2062 case 'i': show_interp = 1; break;
1167 case 'b': show_bind = 1; break; 2063 case 'b': show_bind = 1; break;
1168 case 'S': show_soname = 1; break; 2064 case 'S': show_soname = 1; break;
1169 case 'T': show_textrels = 1; break; 2065 case 'T': show_textrels = 1; break;
1170 default: 2066 default:
1171 err("Invalid format specifier '%c' (byte %i)", 2067 err("Invalid format specifier '%c' (byte %i)",
1172 out_format[i], i+1); 2068 out_format[i], i+1);
1173 } 2069 }
1174 } 2070 }
1175 2071
1176 /* construct our default format */ 2072 /* construct our default format */
1177 } else { 2073 } else {
1178 size_t fmt_len = 30; 2074 size_t fmt_len = 30;
1179 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2075 out_format = xmalloc(sizeof(char) * fmt_len);
2076 *out_format = '\0';
1180 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2077 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1181 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2078 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2079 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2080 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2081 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2082 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2083 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1182 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2084 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1183 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2085 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1184 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2086 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1185 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2087 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1186 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2088 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1187 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2089 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1188 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2090 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1189 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2091 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1190 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2092 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2093 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1191 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2094 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1192 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2095 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1193 } 2096 }
1194 if (be_verbose > 2) printf("Format: %s\n", out_format); 2097 if (be_verbose > 2) printf("Format: %s\n", out_format);
1195 2098
1196 /* now lets actually do the scanning */ 2099 /* now lets actually do the scanning */
1197 if (scan_ldpath || (show_rpath && be_quiet)) 2100 if (scan_ldpath || use_ldcache)
1198 load_ld_so_conf(); 2101 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1199 if (scan_ldpath) scanelf_ldpath(); 2102 if (scan_ldpath) scanelf_ldpath();
1200 if (scan_envpath) scanelf_envpath(); 2103 if (scan_envpath) scanelf_envpath();
2104 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2105 from_file = "-";
1201 if (from_file) { 2106 if (from_file) {
1202 scanelf_from_file(from_file); 2107 scanelf_from_file(from_file);
1203 free(from_file);
1204 from_file = *argv; 2108 from_file = *argv;
1205 } 2109 }
1206 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2110 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1207 err("Nothing to scan !?"); 2111 err("Nothing to scan !?");
1208 while (optind < argc) { 2112 while (optind < argc) {
1209 search_path = argv[optind++]; 2113 search_path = argv[optind++];
1210 scanelf_dir(search_path); 2114 ret = scanelf_dir(search_path);
1211 } 2115 }
1212 2116
1213 /* clean up */ 2117 /* clean up */
1214 if (find_sym) { 2118 xarrayfree(ldpaths);
2119 xarrayfree(find_lib_arr);
2120 xarrayfree(find_section_arr);
1215 free(find_sym); 2121 free(find_lib);
1216 free(versioned_symname); 2122 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 2123
1224 2124 if (ldcache != 0)
1225 2125 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; 2126 return ret;
1232} 2127}
1233 2128
1234static void *xmalloc(size_t size) 2129static char **get_split_env(const char *envvar)
1235{ 2130{
1236 void *ret = malloc(size); 2131 const char *delims = " \t\n";
1237 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 2132 char **envvals = NULL;
1238 return ret; 2133 char *env, *s;
1239} 2134 int nentry;
1240 2135
1241static void xstrcat(char **dst, const char *src, size_t *curr_len) 2136 if ((env = getenv(envvar)) == NULL)
1242{ 2137 return NULL;
1243 size_t new_len;
1244 2138
1245 new_len = strlen(*dst) + strlen(src); 2139 env = xstrdup(env);
1246 if (*curr_len <= new_len) { 2140 if (env == NULL)
1247 *curr_len = new_len + (*curr_len / 2); 2141 return NULL;
1248 *dst = realloc(*dst, *curr_len);
1249 if (!*dst)
1250 err("could not realloc %li bytes", (unsigned long)*curr_len);
1251 }
1252 2142
1253 strcat(*dst, src); 2143 s = strtok(env, delims);
1254} 2144 if (s == NULL) {
2145 free(env);
2146 return NULL;
2147 }
1255 2148
1256static inline void xchrcat(char **dst, const char append, size_t *curr_len) 2149 nentry = 0;
1257{ 2150 while (s != NULL) {
1258 static char my_app[2]; 2151 ++nentry;
1259 my_app[0] = append; 2152 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1260 my_app[1] = '\0'; 2153 envvals[nentry-1] = s;
1261 xstrcat(dst, my_app, curr_len); 2154 s = strtok(NULL, delims);
1262} 2155 }
2156 envvals[nentry] = NULL;
1263 2157
2158 /* don't want to free(env) as it contains the memory that backs
2159 * the envvals array of strings */
2160 return envvals;
2161}
1264 2162
2163static void parseenv(void)
2164{
2165 color_init(false);
2166 qa_textrels = get_split_env("QA_TEXTRELS");
2167 qa_execstack = get_split_env("QA_EXECSTACK");
2168 qa_wx_load = get_split_env("QA_WX_LOAD");
2169}
2170
2171#ifdef __PAX_UTILS_CLEANUP
2172static void cleanup(void)
2173{
2174 free(out_format);
2175 free(qa_textrels);
2176 free(qa_execstack);
2177 free(qa_wx_load);
2178}
2179#endif
1265 2180
1266int main(int argc, char *argv[]) 2181int main(int argc, char *argv[])
1267{ 2182{
2183 int ret;
1268 if (argc < 2) 2184 if (argc < 2)
1269 usage(EXIT_FAILURE); 2185 usage(EXIT_FAILURE);
2186 parseenv();
1270 parseargs(argc, argv); 2187 ret = parseargs(argc, argv);
1271 fclose(stdout); 2188 fclose(stdout);
1272#ifdef __BOUNDS_CHECKING_ON 2189#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()"); 2190 cleanup();
2191 warn("The calls to add/delete heap should be off:\n"
2192 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
2193 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1274#endif 2194#endif
1275 return EXIT_SUCCESS; 2195 return ret;
1276} 2196}
2197
2198/* Match filename against entries in matchlist, return TRUE
2199 * if the file is listed */
2200static int file_matches_list(const char *filename, char **matchlist)
2201{
2202 char **file;
2203 char *match;
2204 char buf[__PAX_UTILS_PATH_MAX];
2205
2206 if (matchlist == NULL)
2207 return 0;
2208
2209 for (file = matchlist; *file != NULL; file++) {
2210 if (search_path) {
2211 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2212 match = buf;
2213 } else {
2214 match = *file;
2215 }
2216 if (fnmatch(match, filename, 0) == 0)
2217 return 1;
2218 }
2219 return 0;
2220}

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