/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.103 Revision 1.229
1/* 1/*
2 * Copyright 2003-2006 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 1.103 2006/01/11 23:46:21 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 2003-2006 Ned Ludd - <solar@gentoo.org> 6 * Copyright 2003-2007 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org> 7 * Copyright 2004-2007 Mike Frysinger - <vapier@gentoo.org>
8 */ 8 */
9 9
10static const char *rcsid = "$Id: scanelf.c,v 1.229 2011/09/27 19:29:19 vapier Exp $";
11const char argv0[] = "scanelf";
12
10#include "paxinc.h" 13#include "paxinc.h"
11 14
12static const char *rcsid = "$Id: scanelf.c,v 1.103 2006/01/11 23:46:21 vapier Exp $";
13#define argv0 "scanelf"
14
15#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
16
17
18 16
19/* prototypes */ 17/* prototypes */
20static void scanelf_file(const char *filename); 18static int file_matches_list(const char *filename, char **matchlist);
21static void scanelf_dir(const char *path);
22static void scanelf_ldpath();
23static void scanelf_envpath();
24static void usage(int status);
25static void parseargs(int argc, char *argv[]);
26static char *xstrdup(const char *s);
27static void *xmalloc(size_t size);
28static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
29#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
30static inline void xchrcat(char **dst, const char append, size_t *curr_len);
31 19
32/* variables to control behavior */ 20/* variables to control behavior */
33static char *ldpaths[256]; 21static char *match_etypes = NULL;
22static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
34static char scan_ldpath = 0; 23static char scan_ldpath = 0;
35static char scan_envpath = 0; 24static char scan_envpath = 0;
36static char scan_symlink = 1; 25static char scan_symlink = 1;
26static char scan_archives = 0;
37static char dir_recurse = 0; 27static char dir_recurse = 0;
38static char dir_crossmount = 1; 28static char dir_crossmount = 1;
39static char show_pax = 0; 29static char show_pax = 0;
30static char show_perms = 0;
31static char show_size = 0;
40static char show_phdr = 0; 32static char show_phdr = 0;
41static char show_textrel = 0; 33static char show_textrel = 0;
42static char show_rpath = 0; 34static char show_rpath = 0;
43static char show_needed = 0; 35static char show_needed = 0;
44static char show_interp = 0; 36static char show_interp = 0;
45static char show_bind = 0; 37static char show_bind = 0;
46static char show_soname = 0; 38static char show_soname = 0;
47static char show_textrels = 0; 39static char show_textrels = 0;
48static char show_banner = 1; 40static char show_banner = 1;
41static char show_endian = 0;
42static char show_osabi = 0;
43static char show_eabi = 0;
49static char be_quiet = 0; 44static char be_quiet = 0;
50static char be_verbose = 0; 45static char be_verbose = 0;
51static char be_wewy_wewy_quiet = 0; 46static char be_wewy_wewy_quiet = 0;
52static char *find_sym = NULL, *versioned_symname = NULL; 47static char be_semi_verbose = 0;
48static char *find_sym = NULL;
53static 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;
54static char *out_format = NULL; 53static char *out_format = NULL;
55static char *search_path = NULL; 54static char *search_path = NULL;
56static char fix_elf = 0; 55static char fix_elf = 0;
57static char gmatch = 0; 56static char g_match = 0;
58static char use_ldcache = 0; 57static char use_ldcache = 0;
59 58
59static char **qa_textrels = NULL;
60static char **qa_execstack = NULL;
61static char **qa_wx_load = NULL;
62static char *root;
60 63
61caddr_t ldcache = 0; 64static int match_bits = 0;
65static unsigned int match_perms = 0;
66static void *ldcache = NULL;
62size_t ldcache_size = 0; 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}
63 119
64/* sub-funcs for scanelf_file() */ 120/* sub-funcs for scanelf_file() */
65static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 121static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
66{ 122{
67 /* 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
68#define GET_SYMTABS(B) \ 132#define GET_SYMTABS(B) \
69 if (elf->elf_class == ELFCLASS ## B) { \ 133 if (elf->elf_class == ELFCLASS ## B) { \
70 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
71 /* debug sections */ \
72 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
73 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
74 /* runtime sections */ \
75 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
76 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
77 if (symtab && dynsym) { \ 134 if (symtab && dynsym) { \
135 Elf ## B ## _Shdr *esymtab = symtab; \
136 Elf ## B ## _Shdr *edynsym = dynsym; \
78 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 137 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
79 } else { \ 138 } else \
80 *sym = (void*)(symtab ? symtab : dynsym); \ 139 *sym = symtab ? symtab : dynsym; \
81 } \
82 if (strtab && dynstr) { \ 140 if (strtab && dynstr) { \
141 Elf ## B ## _Shdr *estrtab = strtab; \
142 Elf ## B ## _Shdr *edynstr = dynstr; \
83 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ 143 *tab = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
84 } else { \ 144 } else \
85 *tab = (void*)(strtab ? strtab : dynstr); \ 145 *tab = strtab ? strtab : dynstr; \
86 } \
87 } 146 }
88 GET_SYMTABS(32) 147 GET_SYMTABS(32)
89 GET_SYMTABS(64) 148 GET_SYMTABS(64)
90} 149}
150
91static char *scanelf_file_pax(elfobj *elf, char *found_pax) 151static char *scanelf_file_pax(elfobj *elf, char *found_pax)
92{ 152{
93 static char ret[7]; 153 static char ret[7];
94 unsigned long i, shown; 154 unsigned long i, shown;
95 155
104 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 164 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
105 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 165 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
106 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 166 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
107 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 167 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
108 continue; \ 168 continue; \
109 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))) \
110 continue; \ 174 continue; \
111 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); \
112 *found_pax = 1; \ 176 *found_pax = 1; \
113 ++shown; \ 177 ++shown; \
114 break; \ 178 break; \
115 } \ 179 } \
116 } 180 }
117 SHOW_PAX(32) 181 SHOW_PAX(32)
118 SHOW_PAX(64) 182 SHOW_PAX(64)
183 }
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 }
119 } 194 }
120 195
121 /* fall back to EI_PAX if no PT_PAX was found */ 196 /* fall back to EI_PAX if no PT_PAX was found */
122 if (!*ret) { 197 if (!*ret) {
123 static char *paxflags; 198 static char *paxflags;
148 223
149 shown = 0; 224 shown = 0;
150 multi_stack = multi_relro = multi_load = 0; 225 multi_stack = multi_relro = multi_load = 0;
151 max_pt_load = elf_max_pt_load(elf); 226 max_pt_load = elf_max_pt_load(elf);
152 227
228#define NOTE_GNU_STACK ".note.GNU-stack"
153#define SHOW_PHDR(B) \ 229#define SHOW_PHDR(B) \
154 if (elf->elf_class == ELFCLASS ## B) { \ 230 if (elf->elf_class == ELFCLASS ## B) { \
155 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 231 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
156 Elf ## B ## _Off offset; \ 232 Elf ## B ## _Off offset; \
157 uint32_t flags, check_flags; \ 233 uint32_t flags, check_flags; \
158 if (elf->phdr != NULL) { \ 234 if (elf->phdr != NULL) { \
159 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 235 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
160 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 236 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
161 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 237 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
238 if (multi_stack++) \
162 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; \
163 found = found_phdr; \ 242 found = found_phdr; \
164 offset = 0; \ 243 offset = 0; \
165 check_flags = PF_X; \ 244 check_flags = PF_X; \
166 } 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++) \
167 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 247 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
168 found = found_relro; \ 248 found = found_relro; \
169 offset = 4; \ 249 offset = 4; \
170 check_flags = PF_X; \ 250 check_flags = PF_X; \
171 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 251 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
252 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
253 if (multi_load++ > max_pt_load) \
172 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, 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; \
173 found = found_load; \ 257 found = found_load; \
174 offset = 8; \ 258 offset = 8; \
175 check_flags = PF_W|PF_X; \ 259 check_flags = PF_W|PF_X; \
176 } else \ 260 } else \
177 continue; \ 261 continue; \
178 flags = EGET(phdr[i].p_flags); \ 262 flags = EGET(phdr[i].p_flags); \
179 if (be_quiet && ((flags & check_flags) != check_flags)) \ 263 if (be_quiet && ((flags & check_flags) != check_flags)) \
180 continue; \ 264 continue; \
181 if (fix_elf && ((flags & PF_X) != flags)) { \ 265 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
182 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \ 266 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
183 ret[3] = ret[7] = '!'; \ 267 ret[3] = ret[7] = '!'; \
184 flags = EGET(phdr[i].p_flags); \ 268 flags = EGET(phdr[i].p_flags); \
185 } \ 269 } \
186 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 270 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
189 } \ 273 } \
190 } else if (elf->shdr != NULL) { \ 274 } else if (elf->shdr != NULL) { \
191 /* no program headers which means this is prob an object file */ \ 275 /* no program headers which means this is prob an object file */ \
192 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 276 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
193 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 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; \
194 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 281 check_flags = SHF_WRITE|SHF_EXECINSTR; \
195 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 282 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
196 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 283 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
197 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 284 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
198 if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \ 285 str = elf->data + offset; \
286 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
287 if (!strcmp(str, NOTE_GNU_STACK)) { \
199 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \ 288 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
200 flags = EGET(shdr[i].sh_flags); \ 289 flags = EGET(shdr[i].sh_flags); \
201 if (be_quiet && ((flags & check_flags) != check_flags)) \ 290 if (be_quiet && ((flags & check_flags) != check_flags)) \
202 continue; \ 291 continue; \
203 ++*found_phdr; \ 292 ++*found_phdr; \
207 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \ 296 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
208 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \ 297 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
209 break; \ 298 break; \
210 } \ 299 } \
211 } \ 300 } \
301 skip_this_shdr##B: \
212 if (!multi_stack) { \ 302 if (!multi_stack) { \
303 if (file_matches_list(elf->filename, qa_execstack)) \
304 return NULL; \
213 *found_phdr = 1; \ 305 *found_phdr = 1; \
214 shown = 1; \ 306 shown = 1; \
215 memcpy(ret, "!WX", 3); \ 307 memcpy(ret, "!WX", 3); \
216 } \ 308 } \
217 } \ 309 } \
222 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 314 if (be_wewy_wewy_quiet || (be_quiet && !shown))
223 return NULL; 315 return NULL;
224 else 316 else
225 return ret; 317 return ret;
226} 318}
319
320/*
321 * See if this ELF contains a DT_TEXTREL tag in any of its
322 * PT_DYNAMIC sections.
323 */
227static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 324static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
228{ 325{
229 static const char *ret = "TEXTREL"; 326 static const char *ret = "TEXTREL";
230 unsigned long i; 327 unsigned long i;
231 328
232 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;
233 332
234 if (elf->phdr) { 333 if (elf->phdr) {
235#define SHOW_TEXTREL(B) \ 334#define SHOW_TEXTREL(B) \
236 if (elf->elf_class == ELFCLASS ## B) { \ 335 if (elf->elf_class == ELFCLASS ## B) { \
237 Elf ## B ## _Dyn *dyn; \ 336 Elf ## B ## _Dyn *dyn; \
238 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 337 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
239 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 338 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
240 Elf ## B ## _Off offset; \ 339 Elf ## B ## _Off offset; \
241 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 340 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
242 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; \
243 offset = EGET(phdr[i].p_offset); \ 342 offset = EGET(phdr[i].p_offset); \
244 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 343 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
245 dyn = DYN ## B (elf->data + offset); \ 344 dyn = DYN ## B (elf->vdata + offset); \
246 while (EGET(dyn->d_tag) != DT_NULL) { \ 345 while (EGET(dyn->d_tag) != DT_NULL) { \
247 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)*/ \
248 *found_textrel = 1; \ 347 *found_textrel = 1; \
249 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 348 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
250 return (be_wewy_wewy_quiet ? NULL : ret); \ 349 return (be_wewy_wewy_quiet ? NULL : ret); \
259 if (be_quiet || be_wewy_wewy_quiet) 358 if (be_quiet || be_wewy_wewy_quiet)
260 return NULL; 359 return NULL;
261 else 360 else
262 return " - "; 361 return " - ";
263} 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 */
264static 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)
265{ 370{
266 unsigned long s, r, rmax; 371 unsigned long s, r, rmax;
267 void *symtab_void, *strtab_void, *text_void; 372 void *symtab_void, *strtab_void, *text_void;
268 373
289 Elf ## B ## _Rela *rela; \ 394 Elf ## B ## _Rela *rela; \
290 /* search the section headers for relocations */ \ 395 /* search the section headers for relocations */ \
291 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 396 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
292 uint32_t sh_type = EGET(shdr[s].sh_type); \ 397 uint32_t sh_type = EGET(shdr[s].sh_type); \
293 if (sh_type == SHT_REL) { \ 398 if (sh_type == SHT_REL) { \
294 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 399 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
295 rela = NULL; \ 400 rela = NULL; \
296 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 401 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
297 } else if (sh_type == SHT_RELA) { \ 402 } else if (sh_type == SHT_RELA) { \
298 rel = NULL; \ 403 rel = NULL; \
299 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 404 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
300 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 405 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
301 } else \ 406 } else \
302 continue; \ 407 continue; \
303 /* now see if any of the relocs are in the .text */ \ 408 /* now see if any of the relocs are in the .text */ \
304 for (r = 0; r < rmax; ++r) { \ 409 for (r = 0; r < rmax; ++r) { \
319 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 424 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
320 if (be_verbose <= 2) continue; \ 425 if (be_verbose <= 2) continue; \
321 } else \ 426 } else \
322 *found_textrels = 1; \ 427 *found_textrels = 1; \
323 /* locate this relocation symbol name */ \ 428 /* locate this relocation symbol name */ \
324 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 } \
325 sym_max = ELF ## B ## _R_SYM(r_info); \ 434 sym_max = ELF ## B ## _R_SYM(r_info); \
326 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 435 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
327 sym += sym_max; \ 436 sym += sym_max; \
328 else \ 437 else \
329 sym = NULL; \ 438 sym = NULL; \
330 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 439 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
331 /* show the raw details about this reloc */ \ 440 /* show the raw details about this reloc */ \
332 printf(" %s: ", elf->base_filename); \ 441 printf(" %s: ", elf->base_filename); \
333 if (sym && sym->st_name) \ 442 if (sym && sym->st_name) \
334 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)); \
335 else \ 444 else \
336 printf("(memory/fake?)"); \ 445 printf("(memory/data?)"); \
337 printf(" [0x%lX]", (unsigned long)r_offset); \ 446 printf(" [0x%lX]", (unsigned long)r_offset); \
338 /* 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 */ \
339 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 448 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
340 func = NULL; \ 449 func = NULL; \
341 offset_tmp = 0; \ 450 offset_tmp = 0; \
342 while (sym_max--) { \ 451 while (sym_max--) { \
343 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) { \
344 func = sym; \ 453 func = sym; \
345 offset_tmp = EGET(sym->st_value); \ 454 offset_tmp = EGET(sym->st_value); \
346 } \ 455 } \
347 ++sym; \ 456 ++sym; \
348 } \ 457 } \
349 printf(" in "); \ 458 printf(" in "); \
350 if (func && func->st_name) \ 459 if (func && func->st_name) { \
351 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); \
352 else \ 463 else \
353 printf("(NULL: fake?)"); \ 464 printf("%s", func_name); \
465 } else \
466 printf("(optimized out)"); \
354 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 } \
355 } \ 489 } \
356 } } 490 } }
357 SHOW_TEXTRELS(32) 491 SHOW_TEXTRELS(32)
358 SHOW_TEXTRELS(64) 492 SHOW_TEXTRELS(64)
359 } 493 }
361 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);
362 496
363 return NULL; 497 return NULL;
364} 498}
365 499
366static void rpath_security_checks(elfobj *, char *, const char *);
367static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type) 500static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
368{ 501{
369 struct stat st; 502 struct stat st;
370 switch (*item) { 503 switch (*item) {
371 case '/': break; 504 case '/': break;
377 warnf("Security problem NULL %s in %s", dt_type, elf->filename); 510 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
378 break; 511 break;
379 case '$': 512 case '$':
380 if (fstat(elf->fd, &st) != -1) 513 if (fstat(elf->fd, &st) != -1)
381 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 514 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
382 warnf("Security problem with %s='%s' in %s with mode set of %o", 515 warnf("Security problem with %s='%s' in %s with mode set of %o",
383 dt_type, item, elf->filename, st.st_mode & 07777); 516 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
384 break; 517 break;
385 default: 518 default:
386 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename); 519 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
387 break; 520 break;
388 } 521 }
389} 522}
390static 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)
391{ 524{
392 unsigned long i, s; 525 unsigned long i;
393 char *rpath, *runpath, **r; 526 char *rpath, *runpath, **r;
394 void *strtbl_void; 527 void *strtbl_void;
395 528
396 if (!show_rpath) return; 529 if (!show_rpath) return;
397 530
408 Elf ## B ## _Off offset; \ 541 Elf ## B ## _Off offset; \
409 Elf ## B ## _Xword word; \ 542 Elf ## B ## _Xword word; \
410 /* Scan all the program headers */ \ 543 /* Scan all the program headers */ \
411 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 544 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
412 /* Just scan dynamic headers */ \ 545 /* Just scan dynamic headers */ \
413 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; \
414 offset = EGET(phdr[i].p_offset); \ 547 offset = EGET(phdr[i].p_offset); \
415 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 548 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
416 /* Just scan dynamic RPATH/RUNPATH headers */ \ 549 /* Just scan dynamic RPATH/RUNPATH headers */ \
417 dyn = DYN ## B (elf->data + offset); \ 550 dyn = DYN ## B (elf->vdata + offset); \
418 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 551 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
419 if (word == DT_RPATH) { \ 552 if (word == DT_RPATH) { \
420 r = &rpath; \ 553 r = &rpath; \
421 } else if (word == DT_RUNPATH) { \ 554 } else if (word == DT_RUNPATH) { \
422 r = &runpath; \ 555 r = &runpath; \
426 } \ 559 } \
427 /* Verify the memory is somewhat sane */ \ 560 /* Verify the memory is somewhat sane */ \
428 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 561 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
429 if (offset < (Elf ## B ## _Off)elf->len) { \ 562 if (offset < (Elf ## B ## _Off)elf->len) { \
430 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 563 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
431 *r = (char*)(elf->data + offset); \ 564 *r = elf->data + offset; \
432 /* cache the length in case we need to nuke this section later on */ \ 565 /* cache the length in case we need to nuke this section later on */ \
433 if (fix_elf) \ 566 if (fix_elf) \
434 offset = strlen(*r); \ 567 offset = strlen(*r); \
435 /* If quiet, don't output paths in ld.so.conf */ \ 568 /* If quiet, don't output paths in ld.so.conf */ \
436 if (be_quiet) { \ 569 if (be_quiet) { \
442 /* scan each path in : delimited list */ \ 575 /* scan each path in : delimited list */ \
443 while (start) { \ 576 while (start) { \
444 rpath_security_checks(elf, start, get_elfdtype(word)); \ 577 rpath_security_checks(elf, start, get_elfdtype(word)); \
445 end = strchr(start, ':'); \ 578 end = strchr(start, ':'); \
446 len = (end ? abs(end - start) : strlen(start)); \ 579 len = (end ? abs(end - start) : strlen(start)); \
447 if (use_ldcache) \ 580 if (use_ldcache) { \
448 for (s = 0; ldpaths[s]; ++s) \ 581 size_t n; \
582 const char *ldpath; \
583 array_for_each(ldpaths, n, ldpath) \
449 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 584 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
450 *r = end; \ 585 *r = end; \
451 /* corner case ... if RPATH reads "/usr/lib:", we want \ 586 /* corner case ... if RPATH reads "/usr/lib:", we want \
452 * to show ':' rather than '' */ \ 587 * to show ':' rather than '' */ \
453 if (end && end[1] != '\0') \ 588 if (end && end[1] != '\0') \
454 (*r)++; \ 589 (*r)++; \
455 break; \ 590 break; \
456 } \ 591 } \
592 } \
457 if (!*r || !end) \ 593 if (!*r || !end) \
458 break; \ 594 break; \
459 else \ 595 else \
460 start = start + len + 1; \ 596 start = start + len + 1; \
461 } \ 597 } \
462 } \ 598 } \
463 if (*r) { \ 599 if (*r) { \
464 if (fix_elf > 2 || **r == '\0') { \ 600 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
465 /* just nuke it */ \ 601 /* just nuke it */ \
466 nuke_it##B: \ 602 nuke_it##B: \
467 memset(*r, 0x00, offset); \ 603 memset(*r, 0x00, offset); \
468 *r = NULL; \ 604 *r = NULL; \
469 ESET(dyn->d_tag, DT_DEBUG); \ 605 ESET(dyn->d_tag, DT_DEBUG); \
546#define FLAG_S390_LIB64 0x0400 682#define FLAG_S390_LIB64 0x0400
547#define FLAG_POWERPC_LIB64 0x0500 683#define FLAG_POWERPC_LIB64 0x0500
548#define FLAG_MIPS64_LIBN32 0x0600 684#define FLAG_MIPS64_LIBN32 0x0600
549#define FLAG_MIPS64_LIBN64 0x0700 685#define FLAG_MIPS64_LIBN64 0x0700
550 686
551static char *lookup_cache_lib(elfobj *, char *); 687#if defined(__GLIBC__) || defined(__UCLIBC__)
688
552static char *lookup_cache_lib(elfobj *elf, char *fname) 689static char *lookup_cache_lib(elfobj *elf, char *fname)
553{ 690{
554 int fd = 0; 691 int fd;
555 char *strs; 692 char *strs;
556 static char buf[_POSIX_PATH_MAX] = ""; 693 static char buf[__PAX_UTILS_PATH_MAX] = "";
557 const char *cachefile = "/etc/ld.so.cache"; 694 const char cachefile[] = "/etc/ld.so.cache";
558 struct stat st; 695 struct stat st;
559 696
560 typedef struct { 697 typedef struct {
561 char magic[LDSO_CACHE_MAGIC_LEN]; 698 char magic[LDSO_CACHE_MAGIC_LEN];
562 char version[LDSO_CACHE_VER_LEN]; 699 char version[LDSO_CACHE_VER_LEN];
572 libentry_t *libent; 709 libentry_t *libent;
573 710
574 if (fname == NULL) 711 if (fname == NULL)
575 return NULL; 712 return NULL;
576 713
577 if (ldcache == 0) { 714 if (ldcache == NULL) {
578 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1) 715 if (stat(cachefile, &st))
716 return NULL;
717
718 fd = open(cachefile, O_RDONLY);
719 if (fd == -1)
579 return NULL; 720 return NULL;
580 721
581 /* cache these values so we only map/unmap the cache file once */ 722 /* cache these values so we only map/unmap the cache file once */
582 ldcache_size = st.st_size; 723 ldcache_size = st.st_size;
583 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0); 724 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
584
585 close(fd); 725 close(fd);
586 726
587 if (ldcache == (caddr_t)-1) 727 if (ldcache == MAP_FAILED) {
728 ldcache = NULL;
588 return NULL; 729 return NULL;
730 }
589 731
590 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)) 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;
591 return NULL; 737 return NULL;
592 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
593 return NULL;
594 } 738 }
739 } else
740 header = ldcache;
595 741
596 header = (header_t *) ldcache;
597 libent = (libentry_t *) (ldcache + sizeof(header_t)); 742 libent = ldcache + sizeof(header_t);
598 strs = (char *) &libent[header->nlibs]; 743 strs = (char *) &libent[header->nlibs];
599 744
600 for (fd = 0; fd < header->nlibs; fd++) { 745 for (fd = 0; fd < header->nlibs; ++fd) {
601 /* this should be more fine grained, but for now we assume that 746 /* This should be more fine grained, but for now we assume that
602 * diff arches will not be cached together. and we ignore the 747 * diff arches will not be cached together, and we ignore the
603 * the different multilib mips cases. */ 748 * the different multilib mips cases.
749 */
604 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK)) 750 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
605 continue; 751 continue;
606 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK)) 752 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
607 continue; 753 continue;
608 754
609 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 755 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
610 continue; 756 continue;
757
758 /* Return first hit because that is how the ldso rolls */
611 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 759 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
760 break;
612 } 761 }
762
613 return buf; 763 return buf;
614} 764}
615 765
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
616 801
617static 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)
618{ 803{
619 unsigned long i; 804 unsigned long i;
620 char *needed; 805 char *needed;
621 void *strtbl_void; 806 void *strtbl_void;
622 char *p; 807 char *p;
623 808
809 /*
810 * -n -> op==0 -> print all
811 * -N -> op==1 -> print requested
812 */
624 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 813 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
814 return NULL;
625 815
626 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 816 strtbl_void = elf_findsecbyname(elf, ".dynstr");
627 817
628 if (elf->phdr && strtbl_void) { 818 if (elf->phdr && strtbl_void) {
629#define SHOW_NEEDED(B) \ 819#define SHOW_NEEDED(B) \
631 Elf ## B ## _Dyn *dyn; \ 821 Elf ## B ## _Dyn *dyn; \
632 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 822 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
633 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 823 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
634 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 824 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
635 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 */ \
636 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 828 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
637 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; \
638 offset = EGET(phdr[i].p_offset); \ 831 offset = EGET(phdr[i].p_offset); \
639 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 */ \
640 dyn = DYN ## B (elf->data + offset); \ 835 dyn = DYN ## B (elf->vdata + offset); \
641 while (EGET(dyn->d_tag) != DT_NULL) { \ 836 while (EGET(dyn->d_tag) != DT_NULL) { \
642 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 837 if (EGET(dyn->d_tag) == DT_NEEDED) { \
643 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 838 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
644 if (offset >= (Elf ## B ## _Off)elf->len) { \ 839 if (offset >= (Elf ## B ## _Off)elf->len) { \
645 ++dyn; \ 840 ++dyn; \
646 continue; \ 841 continue; \
647 } \ 842 } \
648 needed = (char*)(elf->data + offset); \ 843 needed = elf->data + offset; \
649 if (op == 0) { \ 844 if (op == 0) { \
845 /* -n -> print all entries */ \
650 if (!be_wewy_wewy_quiet) { \ 846 if (!be_wewy_wewy_quiet) { \
651 if (*found_needed) xchrcat(ret, ',', ret_len); \ 847 if (*found_needed) xchrcat(ret, ',', ret_len); \
652 if (use_ldcache) \ 848 if (use_ldcache) \
653 if ((p = lookup_cache_lib(elf, needed)) != NULL) \ 849 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
654 needed = p; \ 850 needed = p; \
655 xstrcat(ret, needed, ret_len); \ 851 xstrcat(ret, needed, ret_len); \
656 } \ 852 } \
657 *found_needed = 1; \ 853 *found_needed = 1; \
658 } else { \ 854 } else { \
659 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)) { \
660 *found_lib = 1; \ 864 *found_lib = 1; \
661 return (be_wewy_wewy_quiet ? NULL : needed); \ 865 return (be_wewy_wewy_quiet ? NULL : find_lib); \
662 } \ 866 } \
663 } \ 867 } \
664 } \ 868 } \
665 ++dyn; \ 869 ++dyn; \
666 } \ 870 } \
695} 899}
696static char *scanelf_file_bind(elfobj *elf, char *found_bind) 900static char *scanelf_file_bind(elfobj *elf, char *found_bind)
697{ 901{
698 unsigned long i; 902 unsigned long i;
699 struct stat s; 903 struct stat s;
904 char dynamic = 0;
700 905
701 if (!show_bind) return NULL; 906 if (!show_bind) return NULL;
702 if (!elf->phdr) return NULL; 907 if (!elf->phdr) return NULL;
703 908
704#define SHOW_BIND(B) \ 909#define SHOW_BIND(B) \
706 Elf ## B ## _Dyn *dyn; \ 911 Elf ## B ## _Dyn *dyn; \
707 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 912 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
708 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 913 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
709 Elf ## B ## _Off offset; \ 914 Elf ## B ## _Off offset; \
710 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 915 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
711 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; \
712 offset = EGET(phdr[i].p_offset); \ 918 offset = EGET(phdr[i].p_offset); \
713 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 919 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
714 dyn = DYN ## B (elf->data + offset); \ 920 dyn = DYN ## B (elf->vdata + offset); \
715 while (EGET(dyn->d_tag) != DT_NULL) { \ 921 while (EGET(dyn->d_tag) != DT_NULL) { \
716 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 922 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
717 (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)) \
718 { \ 924 { \
719 if (be_quiet) return NULL; \ 925 if (be_quiet) return NULL; \
727 SHOW_BIND(32) 933 SHOW_BIND(32)
728 SHOW_BIND(64) 934 SHOW_BIND(64)
729 935
730 if (be_wewy_wewy_quiet) return NULL; 936 if (be_wewy_wewy_quiet) return NULL;
731 937
938 /* don't output anything if quiet mode and the ELF is static or not setuid */
732 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))))) {
733 return NULL; 940 return NULL;
734 } else { 941 } else {
735 *found_bind = 1; 942 *found_bind = 1;
736 return (char *) "LAZY"; 943 return (char *)(dynamic ? "LAZY" : "STATIC");
737 } 944 }
738} 945}
739static char *scanelf_file_soname(elfobj *elf, char *found_soname) 946static char *scanelf_file_soname(elfobj *elf, char *found_soname)
740{ 947{
741 unsigned long i; 948 unsigned long i;
753 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 960 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
754 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 961 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
755 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 962 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
756 Elf ## B ## _Off offset; \ 963 Elf ## B ## _Off offset; \
757 /* only look for soname in shared objects */ \ 964 /* only look for soname in shared objects */ \
758 if (ehdr->e_type != ET_DYN) \ 965 if (EGET(ehdr->e_type) != ET_DYN) \
759 return NULL; \ 966 return NULL; \
760 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 967 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
761 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; \
762 offset = EGET(phdr[i].p_offset); \ 969 offset = EGET(phdr[i].p_offset); \
763 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 970 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
764 dyn = DYN ## B (elf->data + offset); \ 971 dyn = DYN ## B (elf->vdata + offset); \
765 while (EGET(dyn->d_tag) != DT_NULL) { \ 972 while (EGET(dyn->d_tag) != DT_NULL) { \
766 if (EGET(dyn->d_tag) == DT_SONAME) { \ 973 if (EGET(dyn->d_tag) == DT_SONAME) { \
767 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 974 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
768 if (offset >= (Elf ## B ## _Off)elf->len) { \ 975 if (offset >= (Elf ## B ## _Off)elf->len) { \
769 ++dyn; \ 976 ++dyn; \
770 continue; \ 977 continue; \
771 } \ 978 } \
772 soname = (char*)(elf->data + offset); \ 979 soname = elf->data + offset; \
773 *found_soname = 1; \ 980 *found_soname = 1; \
774 return (be_wewy_wewy_quiet ? NULL : soname); \ 981 return (be_wewy_wewy_quiet ? NULL : soname); \
775 } \ 982 } \
776 ++dyn; \ 983 ++dyn; \
777 } \ 984 } \
780 SHOW_SONAME(64) 987 SHOW_SONAME(64)
781 } 988 }
782 989
783 return NULL; 990 return NULL;
784} 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
785static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1160static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
786{ 1161{
787 unsigned long i; 1162 unsigned long i;
788 char *ret; 1163 char *ret;
789 void *symtab_void, *strtab_void; 1164 void *symtab_void, *strtab_void;
790 1165
791 if (!find_sym) return NULL; 1166 if (!find_sym) return NULL;
792 ret = find_sym; 1167 ret = NULL;
793 1168
794 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1169 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
795 1170
796 if (symtab_void && strtab_void) { 1171 if (symtab_void && strtab_void) {
797#define FIND_SYM(B) \ 1172#define FIND_SYM(B) \
798 if (elf->elf_class == ELFCLASS ## B) { \ 1173 if (elf->elf_class == ELFCLASS ## B) { \
799 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1174 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
800 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1175 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
801 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)); \
802 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1177 unsigned long cnt = EGET(symtab->sh_entsize); \
803 char *symname; \ 1178 char *symname; \
1179 size_t ret_len = 0; \
1180 if (cnt) \
1181 cnt = EGET(symtab->sh_size) / cnt; \
804 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 } \
805 if (sym->st_name) { \ 1187 if (sym->st_name) { \
1188 /* make sure the symbol name is in acceptable memory range */ \
806 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1189 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
807 if (*find_sym == '*') { \ 1190 if ((void*)symname > elf->data_end) { \
808 printf("%s(%s) %5lX %15s %s\n", \ 1191 warnf("%s: corrupt ELF symbols", elf->filename); \
809 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1192 ++sym; \
810 elf->base_filename, \ 1193 continue; \
811 (unsigned long)sym->st_size, \
812 get_elfstttype(sym->st_info), \
813 symname); \
814 *found_sym = 1; \
815 } else { \
816 char *this_sym, *next_sym; \
817 this_sym = find_sym; \
818 do { \
819 next_sym = strchr(this_sym, ','); \
820 if (next_sym == NULL) \
821 next_sym = this_sym + strlen(this_sym); \
822 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
823 (strcmp(symname, versioned_symname) == 0)) { \
824 ret = this_sym; \
825 (*found_sym)++; \
826 goto break_out; \
827 } \
828 this_sym = next_sym + 1; \
829 } while (*next_sym != '\0'); \
830 } \ 1194 } \
1195 scanelf_match_symname(elf, found_sym, \
1196 &ret, &ret_len, symname, \
1197 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1198 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1199 EGET(sym->st_shndx), \
1200 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1201 EGET(sym->st_size)); \
831 } \ 1202 } \
832 ++sym; \ 1203 ++sym; \
833 } } 1204 } }
834 FIND_SYM(32) 1205 FIND_SYM(32)
835 FIND_SYM(64) 1206 FIND_SYM(64)
841 if (*find_sym != '*' && *found_sym) 1212 if (*find_sym != '*' && *found_sym)
842 return ret; 1213 return ret;
843 if (be_quiet) 1214 if (be_quiet)
844 return NULL; 1215 return NULL;
845 else 1216 else
846 return (char *)" - "; 1217 return " - ";
847} 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
848/* scan an elf file and show all the fun stuff */ 1258/* scan an elf file and show all the fun stuff */
849#define prints(str) write(fileno(stdout), str, strlen(str)) 1259#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
850static void scanelf_file(const char *filename) 1260static int scanelf_elfobj(elfobj *elf)
851{ 1261{
852 unsigned long i; 1262 unsigned long i;
853 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1263 char found_pax, found_phdr, found_relro, found_load, found_textrel,
854 found_rpath, found_needed, found_interp, found_bind, found_soname, 1264 found_rpath, found_needed, found_interp, found_bind, found_soname,
855 found_sym, found_lib, found_file, found_textrels; 1265 found_sym, found_lib, found_file, found_textrels, found_section;
856 elfobj *elf;
857 struct stat st;
858 static char *out_buffer = NULL; 1266 static char *out_buffer = NULL;
859 static size_t out_len; 1267 static size_t out_len;
860 1268
861 /* make sure 'filename' exists */
862 if (lstat(filename, &st) == -1) {
863 if (be_verbose > 2) printf("%s: does not exist\n", filename);
864 return;
865 }
866 /* always handle regular files and handle symlinked files if no -y */
867 if (S_ISLNK(st.st_mode)) {
868 if (!scan_symlink) return;
869 stat(filename, &st);
870 }
871 if (!S_ISREG(st.st_mode)) {
872 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
873 return;
874 }
875
876 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1269 found_pax = found_phdr = found_relro = found_load = found_textrel = \
877 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1270 found_rpath = found_needed = found_interp = found_bind = found_soname = \
878 found_sym = found_lib = found_file = found_textrels = 0; 1271 found_sym = found_lib = found_file = found_textrels = found_section = 0;
879 1272
880 /* verify this is real ELF */
881 if ((elf = _readelf(filename, !fix_elf)) == NULL) {
882 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
883 return;
884 }
885
886 if (be_verbose > 1) 1273 if (be_verbose > 2)
887 printf("%s: scanning file {%s,%s}\n", filename, 1274 printf("%s: scanning file {%s,%s}\n", elf->filename,
888 get_elfeitype(EI_CLASS, elf->elf_class), 1275 get_elfeitype(EI_CLASS, elf->elf_class),
889 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1276 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
890 else if (be_verbose) 1277 else if (be_verbose > 1)
891 printf("%s: scanning file\n", filename); 1278 printf("%s: scanning file\n", elf->filename);
892 1279
893 /* init output buffer */ 1280 /* init output buffer */
894 if (!out_buffer) { 1281 if (!out_buffer) {
895 out_len = sizeof(char) * 80; 1282 out_len = sizeof(char) * 80;
896 out_buffer = (char*)xmalloc(out_len); 1283 out_buffer = xmalloc(out_len);
897 } 1284 }
898 *out_buffer = '\0'; 1285 *out_buffer = '\0';
899 1286
900 /* show the header */ 1287 /* show the header */
901 if (!be_quiet && show_banner) { 1288 if (!be_quiet && show_banner) {
902 for (i = 0; out_format[i]; ++i) { 1289 for (i = 0; out_format[i]; ++i) {
903 if (!IS_MODIFIER(out_format[i])) continue; 1290 if (!IS_MODIFIER(out_format[i])) continue;
904 1291
905 switch (out_format[++i]) { 1292 switch (out_format[++i]) {
1293 case '+': break;
906 case '%': break; 1294 case '%': break;
907 case '#': break; 1295 case '#': break;
908 case 'F': 1296 case 'F':
909 case 'p': 1297 case 'p':
910 case 'f': prints("FILE "); found_file = 1; break; 1298 case 'f': prints("FILE "); found_file = 1; break;
911 case 'o': prints(" TYPE "); break; 1299 case 'o': prints(" TYPE "); break;
912 case 'x': prints(" PAX "); break; 1300 case 'x': prints(" PAX "); break;
913 case 'e': prints("STK/REL/PTL "); break; 1301 case 'e': prints("STK/REL/PTL "); break;
914 case 't': prints("TEXTREL "); break; 1302 case 't': prints("TEXTREL "); break;
915 case 'r': prints("RPATH "); break; 1303 case 'r': prints("RPATH "); break;
1304 case 'M': prints("CLASS "); break;
916 case 'n': prints("NEEDED "); break; 1305 case 'n': prints("NEEDED "); break;
917 case 'i': prints("INTERP "); break; 1306 case 'i': prints("INTERP "); break;
918 case 'b': prints("BIND "); break; 1307 case 'b': prints("BIND "); break;
1308 case 'Z': prints("SIZE "); break;
919 case 'S': prints("SONAME "); break; 1309 case 'S': prints("SONAME "); break;
920 case 's': prints("SYM "); break; 1310 case 's': prints("SYM "); break;
921 case 'N': prints("LIB "); break; 1311 case 'N': prints("LIB "); break;
922 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;
923 default: warnf("'%c' has no title ?", out_format[i]); 1319 default: warnf("'%c' has no title ?", out_format[i]);
924 } 1320 }
925 } 1321 }
926 if (!found_file) prints("FILE "); 1322 if (!found_file) prints("FILE ");
927 prints("\n"); 1323 prints("\n");
931 1327
932 /* dump all the good stuff */ 1328 /* dump all the good stuff */
933 for (i = 0; out_format[i]; ++i) { 1329 for (i = 0; out_format[i]; ++i) {
934 const char *out; 1330 const char *out;
935 const char *tmp; 1331 const char *tmp;
936 1332 static char ubuf[sizeof(unsigned long)*2];
937 /* make sure we trim leading spaces in quiet mode */
938 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
939 *out_buffer = '\0';
940
941 if (!IS_MODIFIER(out_format[i])) { 1333 if (!IS_MODIFIER(out_format[i])) {
942 xchrcat(&out_buffer, out_format[i], &out_len); 1334 xchrcat(&out_buffer, out_format[i], &out_len);
943 continue; 1335 continue;
944 } 1336 }
945 1337
946 out = NULL; 1338 out = NULL;
947 be_wewy_wewy_quiet = (out_format[i] == '#'); 1339 be_wewy_wewy_quiet = (out_format[i] == '#');
1340 be_semi_verbose = (out_format[i] == '+');
948 switch (out_format[++i]) { 1341 switch (out_format[++i]) {
1342 case '+':
949 case '%': 1343 case '%':
950 case '#': 1344 case '#':
951 xchrcat(&out_buffer, out_format[i], &out_len); break; 1345 xchrcat(&out_buffer, out_format[i], &out_len); break;
952 case 'F': 1346 case 'F':
953 found_file = 1; 1347 found_file = 1;
954 if (be_wewy_wewy_quiet) break; 1348 if (be_wewy_wewy_quiet) break;
955 xstrcat(&out_buffer, filename, &out_len); 1349 xstrcat(&out_buffer, elf->filename, &out_len);
956 break; 1350 break;
957 case 'p': 1351 case 'p':
958 found_file = 1; 1352 found_file = 1;
959 if (be_wewy_wewy_quiet) break; 1353 if (be_wewy_wewy_quiet) break;
960 tmp = filename; 1354 tmp = elf->filename;
961 if (search_path) { 1355 if (search_path) {
962 ssize_t len_search = strlen(search_path); 1356 ssize_t len_search = strlen(search_path);
963 ssize_t len_file = strlen(filename); 1357 ssize_t len_file = strlen(elf->filename);
964 if (!strncmp(filename, search_path, len_search) && \ 1358 if (!strncmp(elf->filename, search_path, len_search) && \
965 len_file > len_search) 1359 len_file > len_search)
966 tmp += len_search; 1360 tmp += len_search;
967 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1361 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
968 } 1362 }
969 xstrcat(&out_buffer, tmp, &out_len); 1363 xstrcat(&out_buffer, tmp, &out_len);
970 break; 1364 break;
971 case 'f': 1365 case 'f':
972 found_file = 1; 1366 found_file = 1;
973 if (be_wewy_wewy_quiet) break; 1367 if (be_wewy_wewy_quiet) break;
974 tmp = strrchr(filename, '/'); 1368 tmp = strrchr(elf->filename, '/');
975 tmp = (tmp == NULL ? filename : tmp+1); 1369 tmp = (tmp == NULL ? elf->filename : tmp+1);
976 xstrcat(&out_buffer, tmp, &out_len); 1370 xstrcat(&out_buffer, tmp, &out_len);
977 break; 1371 break;
978 case 'o': out = get_elfetype(elf); break; 1372 case 'o': out = get_elfetype(elf); break;
979 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1373 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
980 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;
981 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1375 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
982 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;
983 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;
984 case 'n': 1381 case 'n':
985 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;
986 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1383 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
987 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1384 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
988 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1385 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
989 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;;
990 default: warnf("'%c' has no scan code?", out_format[i]); 1392 default: warnf("'%c' has no scan code?", out_format[i]);
991 } 1393 }
992 if (out) { 1394 if (out)
993 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
994 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
995 xstrncat(&out_buffer, out, &out_len, (tmp-out));
996 else
997 xstrcat(&out_buffer, out, &out_len); 1395 xstrcat(&out_buffer, out, &out_len);
998 }
999 } 1396 }
1000 1397
1001#define FOUND_SOMETHING() \ 1398#define FOUND_SOMETHING() \
1002 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1399 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1003 found_rpath || found_needed || found_interp || found_bind || \ 1400 found_rpath || found_needed || found_interp || found_bind || \
1004 found_soname || found_sym || found_lib || found_textrels) 1401 found_soname || found_sym || found_lib || found_textrels || found_section )
1005 1402
1006 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1403 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1007 xchrcat(&out_buffer, ' ', &out_len); 1404 xchrcat(&out_buffer, ' ', &out_len);
1008 xstrcat(&out_buffer, filename, &out_len); 1405 xstrcat(&out_buffer, elf->filename, &out_len);
1009 } 1406 }
1010 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1407 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1011 puts(out_buffer); 1408 puts(out_buffer);
1012 fflush(stdout); 1409 fflush(stdout);
1013 } 1410 }
1014 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:
1015 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;
1016} 1529}
1017 1530
1018/* 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 */
1019static void scanelf_dir(const char *path) 1532static int scanelf_dir(const char *path)
1020{ 1533{
1021 register DIR *dir; 1534 register DIR *dir;
1022 register struct dirent *dentry; 1535 register struct dirent *dentry;
1023 struct stat st_top, st; 1536 struct stat st_top, st;
1024 char buf[_POSIX_PATH_MAX]; 1537 char buf[__PAX_UTILS_PATH_MAX];
1538 char _path[__PAX_UTILS_PATH_MAX];
1025 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);
1026 1543
1027 /* make sure path exists */ 1544 /* make sure path exists */
1028 if (lstat(path, &st_top) == -1) { 1545 if (lstat(path, &st_top) == -1) {
1029 if (be_verbose > 2) printf("%s: does not exist\n", path); 1546 if (be_verbose > 2) printf("%s: does not exist\n", path);
1030 return; 1547 return 1;
1031 } 1548 }
1032 1549
1033 /* 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 */
1034 if (!S_ISDIR(st_top.st_mode)) { 1551 if (!S_ISDIR(st_top.st_mode)) {
1035 scanelf_file(path); 1552 return scanelf_file(path, &st_top);
1036 return;
1037 } 1553 }
1038 1554
1039 /* now scan the dir looking for fun stuff */ 1555 /* now scan the dir looking for fun stuff */
1040 if ((dir = opendir(path)) == NULL) { 1556 if ((dir = opendir(path)) == NULL) {
1041 warnf("could not opendir %s: %s", path, strerror(errno)); 1557 warnf("could not opendir %s: %s", path, strerror(errno));
1042 return; 1558 return 1;
1043 } 1559 }
1044 if (be_verbose) printf("%s: scanning dir\n", path); 1560 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1045 1561
1046 pathlen = strlen(path); 1562 pathlen = strlen(path);
1047 while ((dentry = readdir(dir))) { 1563 while ((dentry = readdir(dir))) {
1048 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1564 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1049 continue; 1565 continue;
1051 if (len >= sizeof(buf)) { 1567 if (len >= sizeof(buf)) {
1052 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1568 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1053 (unsigned long)len, (unsigned long)sizeof(buf)); 1569 (unsigned long)len, (unsigned long)sizeof(buf));
1054 continue; 1570 continue;
1055 } 1571 }
1056 sprintf(buf, "%s/%s", path, dentry->d_name); 1572 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1057 if (lstat(buf, &st) != -1) { 1573 if (lstat(buf, &st) != -1) {
1058 if (S_ISREG(st.st_mode)) 1574 if (S_ISREG(st.st_mode))
1059 scanelf_file(buf); 1575 ret = scanelf_file(buf, &st);
1060 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1576 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1061 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1577 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1062 scanelf_dir(buf); 1578 ret = scanelf_dir(buf);
1063 } 1579 }
1064 } 1580 }
1065 } 1581 }
1066 closedir(dir); 1582 closedir(dir);
1583 return ret;
1067} 1584}
1068 1585
1069static int scanelf_from_file(char *filename) 1586static int scanelf_from_file(const char *filename)
1070{ 1587{
1071 FILE *fp = NULL; 1588 FILE *fp = NULL;
1072 char *p; 1589 char *p;
1073 char path[_POSIX_PATH_MAX]; 1590 char path[__PAX_UTILS_PATH_MAX];
1591 int ret = 0;
1074 1592
1075 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1593 if (strcmp(filename, "-") == 0)
1076 fp = stdin; 1594 fp = stdin;
1077 else if ((fp = fopen(filename, "r")) == NULL) 1595 else if ((fp = fopen(filename, "r")) == NULL)
1078 return 1; 1596 return 1;
1079 1597
1080 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1598 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1081 if ((p = strchr(path, '\n')) != NULL) 1599 if ((p = strchr(path, '\n')) != NULL)
1082 *p = 0; 1600 *p = 0;
1083 search_path = path; 1601 search_path = path;
1084 scanelf_dir(path); 1602 ret = scanelf_dir(path);
1085 } 1603 }
1086 if (fp != stdin) 1604 if (fp != stdin)
1087 fclose(fp); 1605 fclose(fp);
1088 return 0; 1606 return ret;
1089} 1607}
1090 1608
1091static 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)
1092{ 1612{
1093 FILE *fp = NULL; 1613 FILE *fp = NULL;
1094 char *p; 1614 char *p;
1095 char path[_POSIX_PATH_MAX]; 1615 char path[__PAX_UTILS_PATH_MAX];
1096 int i = 0; 1616 char _fname[__PAX_UTILS_PATH_MAX];
1097 1617
1618 fname = maybe_add_root(fname, _fname);
1619
1098 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1620 if ((fp = fopen(fname, "r")) == NULL)
1099 return; 1621 return i;
1100 1622
1101 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1623 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1102 if (*path != '/')
1103 continue;
1104
1105 if ((p = strrchr(path, '\r')) != NULL) 1624 if ((p = strrchr(path, '\r')) != NULL)
1106 *p = 0; 1625 *p = 0;
1107 if ((p = strchr(path, '\n')) != NULL) 1626 if ((p = strchr(path, '\n')) != NULL)
1108 *p = 0; 1627 *p = 0;
1109 1628
1110 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];
1111 1634
1112 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1635 memset(gpath, 0, sizeof(gpath));
1113 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 }
1114 } 1654 }
1115 ldpaths[i] = NULL; 1655
1656 if (*path != '/')
1657 continue;
1658
1659 xarraypush(ldpaths, path, strlen(path));
1660 }
1116 1661
1117 fclose(fp); 1662 fclose(fp);
1663 return i;
1118} 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
1119 1715
1120/* scan /etc/ld.so.conf for paths */ 1716/* scan /etc/ld.so.conf for paths */
1121static void scanelf_ldpath() 1717static void scanelf_ldpath(void)
1122{ 1718{
1123 char scan_l, scan_ul, scan_ull; 1719 char scan_l, scan_ul, scan_ull;
1720 size_t n;
1721 const char *ldpath;
1124 int i = 0; 1722 int i = 0;
1125 1723
1126 if (!ldpaths[0]) 1724 if (array_cnt(ldpaths) == 0)
1127 err("Unable to load any paths from ld.so.conf"); 1725 err("Unable to load any paths from ld.so.conf");
1128 1726
1129 scan_l = scan_ul = scan_ull = 0; 1727 scan_l = scan_ul = scan_ull = 0;
1130 1728
1131 while (ldpaths[i]) { 1729 array_for_each(ldpaths, n, ldpath) {
1132 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1; 1730 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = 1;
1133 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1; 1731 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = 1;
1134 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1; 1732 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = 1;
1135 scanelf_dir(ldpaths[i]); 1733 scanelf_dir(ldpath);
1136 ++i; 1734 ++i;
1137 } 1735 }
1138 1736
1139 if (!scan_l) scanelf_dir("/lib"); 1737 if (!scan_l) scanelf_dir("/lib");
1140 if (!scan_ul) scanelf_dir("/usr/lib"); 1738 if (!scan_ul) scanelf_dir("/usr/lib");
1141 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1739 if (!scan_ull) scanelf_dir("/usr/local/lib");
1142} 1740}
1143 1741
1144/* scan env PATH for paths */ 1742/* scan env PATH for paths */
1145static void scanelf_envpath() 1743static void scanelf_envpath(void)
1146{ 1744{
1147 char *path, *p; 1745 char *path, *p;
1148 1746
1149 path = getenv("PATH"); 1747 path = getenv("PATH");
1150 if (!path) 1748 if (!path)
1157 } 1755 }
1158 1756
1159 free(path); 1757 free(path);
1160} 1758}
1161 1759
1162 1760/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1163/* usage / invocation handling functions */
1164#define PARSE_FLAGS "plRmyXxetrnLibSs:gN:TaqvF:f:o:BhV" 1761#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1165#define a_argument required_argument 1762#define a_argument required_argument
1166static struct option const long_opts[] = { 1763static struct option const long_opts[] = {
1167 {"path", no_argument, NULL, 'p'}, 1764 {"path", no_argument, NULL, 'p'},
1168 {"ldpath", no_argument, NULL, 'l'}, 1765 {"ldpath", no_argument, NULL, 'l'},
1766 {"root", a_argument, NULL, 128},
1169 {"recursive", no_argument, NULL, 'R'}, 1767 {"recursive", no_argument, NULL, 'R'},
1170 {"mount", no_argument, NULL, 'm'}, 1768 {"mount", no_argument, NULL, 'm'},
1171 {"symlink", no_argument, NULL, 'y'}, 1769 {"symlink", no_argument, NULL, 'y'},
1770 {"archives", no_argument, NULL, 'A'},
1771 {"ldcache", no_argument, NULL, 'L'},
1172 {"fix", no_argument, NULL, 'X'}, 1772 {"fix", no_argument, NULL, 'X'},
1773 {"setpax", a_argument, NULL, 'z'},
1173 {"pax", no_argument, NULL, 'x'}, 1774 {"pax", no_argument, NULL, 'x'},
1174 {"header", no_argument, NULL, 'e'}, 1775 {"header", no_argument, NULL, 'e'},
1175 {"textrel", no_argument, NULL, 't'}, 1776 {"textrel", no_argument, NULL, 't'},
1176 {"rpath", no_argument, NULL, 'r'}, 1777 {"rpath", no_argument, NULL, 'r'},
1177 {"needed", no_argument, NULL, 'n'}, 1778 {"needed", no_argument, NULL, 'n'},
1178 {"ldcache", no_argument, NULL, 'L'},
1179 {"interp", no_argument, NULL, 'i'}, 1779 {"interp", no_argument, NULL, 'i'},
1180 {"bind", no_argument, NULL, 'b'}, 1780 {"bind", no_argument, NULL, 'b'},
1181 {"soname", no_argument, NULL, 'S'}, 1781 {"soname", no_argument, NULL, 'S'},
1182 {"symbol", a_argument, NULL, 's'}, 1782 {"symbol", a_argument, NULL, 's'},
1783 {"section", a_argument, NULL, 'k'},
1183 {"lib", a_argument, NULL, 'N'}, 1784 {"lib", a_argument, NULL, 'N'},
1184 {"gmatch", no_argument, NULL, 'g'}, 1785 {"gmatch", no_argument, NULL, 'g'},
1185 {"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'},
1186 {"all", no_argument, NULL, 'a'}, 1794 {"all", no_argument, NULL, 'a'},
1187 {"quiet", no_argument, NULL, 'q'}, 1795 {"quiet", no_argument, NULL, 'q'},
1188 {"verbose", no_argument, NULL, 'v'}, 1796 {"verbose", no_argument, NULL, 'v'},
1189 {"format", a_argument, NULL, 'F'}, 1797 {"format", a_argument, NULL, 'F'},
1190 {"from", a_argument, NULL, 'f'}, 1798 {"from", a_argument, NULL, 'f'},
1191 {"file", a_argument, NULL, 'o'}, 1799 {"file", a_argument, NULL, 'o'},
1800 {"nocolor", no_argument, NULL, 'C'},
1192 {"nobanner", no_argument, NULL, 'B'}, 1801 {"nobanner", no_argument, NULL, 'B'},
1193 {"help", no_argument, NULL, 'h'}, 1802 {"help", no_argument, NULL, 'h'},
1194 {"version", no_argument, NULL, 'V'}, 1803 {"version", no_argument, NULL, 'V'},
1195 {NULL, no_argument, NULL, 0x0} 1804 {NULL, no_argument, NULL, 0x0}
1196}; 1805};
1197 1806
1198static const char *opts_help[] = { 1807static const char * const opts_help[] = {
1199 "Scan all directories in PATH environment", 1808 "Scan all directories in PATH environment",
1200 "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)",
1201 "Scan directories recursively", 1811 "Scan directories recursively",
1202 "Don't recursively cross mount points", 1812 "Don't recursively cross mount points",
1203 "Don't scan symlinks", 1813 "Don't scan symlinks",
1814 "Scan archives (.a files)",
1815 "Utilize ld.so.cache information (use with -r/-n)",
1204 "Try and 'fix' bad things (use with -r/-e)\n", 1816 "Try and 'fix' bad things (use with -r/-e)",
1817 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1205 "Print PaX markings", 1818 "Print PaX markings",
1206 "Print GNU_STACK/PT_LOAD markings", 1819 "Print GNU_STACK/PT_LOAD markings",
1207 "Print TEXTREL information", 1820 "Print TEXTREL information",
1208 "Print RPATH information", 1821 "Print RPATH information",
1209 "Print NEEDED information", 1822 "Print NEEDED information",
1210 "Utilize ld.so.cache information (use with -r/-n)",
1211 "Print INTERP information", 1823 "Print INTERP information",
1212 "Print BIND information", 1824 "Print BIND information",
1213 "Print SONAME information", 1825 "Print SONAME information",
1214 "Find a specified symbol", 1826 "Find a specified symbol",
1827 "Find a specified section",
1215 "Find a specified library", 1828 "Find a specified library",
1216 "Use strncmp to match libraries. (use with -N)", 1829 "Use regex matching rather than string compare (use with -s)",
1217 "Locate cause of TEXTREL", 1830 "Locate cause of TEXTREL",
1218 "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",
1219 "Only output 'bad' things", 1839 "Only output 'bad' things",
1220 "Be verbose (can be specified more than once)", 1840 "Be verbose (can be specified more than once)",
1221 "Use specified format for output", 1841 "Use specified format for output",
1222 "Read input stream from a filename", 1842 "Read input stream from a filename",
1223 "Write output stream to a filename", 1843 "Write output stream to a filename",
1844 "Don't emit color in output",
1224 "Don't display the header", 1845 "Don't display the header",
1225 "Print this help and exit", 1846 "Print this help and exit",
1226 "Print version and exit", 1847 "Print version and exit",
1227 NULL 1848 NULL
1228}; 1849};
1230/* display usage and exit */ 1851/* display usage and exit */
1231static void usage(int status) 1852static void usage(int status)
1232{ 1853{
1233 unsigned long i; 1854 unsigned long i;
1234 printf("* Scan ELF binaries for stuff\n\n" 1855 printf("* Scan ELF binaries for stuff\n\n"
1235 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1856 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1236 printf("Options: -[%s]\n", PARSE_FLAGS); 1857 printf("Options: -[%s]\n", PARSE_FLAGS);
1237 for (i = 0; long_opts[i].name; ++i) 1858 for (i = 0; long_opts[i].name; ++i)
1238 if (long_opts[i].has_arg == no_argument) 1859 if (long_opts[i].has_arg == no_argument)
1239 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",
1240 long_opts[i].name, opts_help[i]); 1864 long_opts[i].name, opts_help[i]);
1241 else 1865 else
1242 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 1866 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1243 long_opts[i].name, opts_help[i]); 1867 long_opts[i].name, opts_help[i]);
1244 1868
1245 if (status != EXIT_SUCCESS) 1869 puts("\nFor more information, see the scanelf(1) manpage");
1246 exit(status);
1247
1248 puts("\nThe format modifiers for the -F option are:");
1249 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1250 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1251 puts(" i INTERP \tb BIND \ts symbol");
1252 puts(" N library \to Type \tT TEXTRELs");
1253 puts(" S SONAME");
1254 puts(" p filename (with search path removed)");
1255 puts(" f filename (short name/basename)");
1256 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1257
1258 exit(status); 1870 exit(status);
1259} 1871}
1260 1872
1261/* 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 }
1262static void parseargs(int argc, char *argv[]) 1882static int parseargs(int argc, char *argv[])
1263{ 1883{
1264 int i; 1884 int i;
1265 char *from_file = NULL; 1885 const char *from_file = NULL;
1886 int ret = 0;
1266 1887
1267 opterr = 0; 1888 opterr = 0;
1268 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) {
1269 switch (i) { 1890 switch (i) {
1270 1891
1277 case 'h': usage(EXIT_SUCCESS); break; 1898 case 'h': usage(EXIT_SUCCESS); break;
1278 case 'f': 1899 case 'f':
1279 if (from_file) warn("You prob don't want to specify -f twice"); 1900 if (from_file) warn("You prob don't want to specify -f twice");
1280 from_file = optarg; 1901 from_file = optarg;
1281 break; 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;
1918 break;
1282 case 'o': { 1919 case 'o': {
1283 FILE *fp = NULL;
1284 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1920 if (freopen(optarg, "w", stdout) == NULL)
1285 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1921 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1286 SET_STDOUT(fp);
1287 break; 1922 break;
1288 } 1923 }
1289 1924 case 'k':
1925 xarraypush(find_section_arr, optarg, strlen(optarg));
1926 break;
1290 case 's': { 1927 case 's': {
1291 if (find_sym) warn("You prob don't want to specify -s twice"); 1928 if (find_sym) warn("You prob don't want to specify -s twice");
1292 find_sym = optarg; 1929 find_sym = optarg;
1293 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1294 sprintf(versioned_symname, "%s@", find_sym);
1295 break; 1930 break;
1296 } 1931 }
1297 case 'N': { 1932 case 'N':
1298 if (find_lib) warn("You prob don't want to specify -N twice"); 1933 xarraypush(find_lib_arr, optarg, strlen(optarg));
1299 find_lib = optarg;
1300 break; 1934 break;
1301 }
1302
1303 case 'F': { 1935 case 'F': {
1304 if (out_format) warn("You prob don't want to specify -F twice"); 1936 if (out_format) warn("You prob don't want to specify -F twice");
1305 out_format = optarg; 1937 out_format = optarg;
1306 break; 1938 break;
1307 } 1939 }
1940 case 'z': {
1941 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1942 size_t x;
1308 1943
1309 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */ 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;
1984 case 'g': g_match = 1; break;
1310 case 'L': use_ldcache = 1; break; 1985 case 'L': use_ldcache = 1; break;
1311 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;
1312 case 'B': show_banner = 0; break; 1989 case 'B': show_banner = 0; break;
1313 case 'l': scan_ldpath = 1; break; 1990 case 'l': scan_ldpath = 1; break;
1314 case 'p': scan_envpath = 1; break; 1991 case 'p': scan_envpath = 1; break;
1315 case 'R': dir_recurse = 1; break; 1992 case 'R': dir_recurse = 1; break;
1316 case 'm': dir_crossmount = 0; break; 1993 case 'm': dir_crossmount = 0; break;
1324 case 'b': show_bind = 1; break; 2001 case 'b': show_bind = 1; break;
1325 case 'S': show_soname = 1; break; 2002 case 'S': show_soname = 1; break;
1326 case 'T': show_textrels = 1; break; 2003 case 'T': show_textrels = 1; break;
1327 case 'q': be_quiet = 1; break; 2004 case 'q': be_quiet = 1; break;
1328 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2005 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1329 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;
1330 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;
1331 case ':': 2013 case ':':
1332 err("Option missing parameter\n"); 2014 err("Option '%c' is missing parameter", optopt);
1333 case '?': 2015 case '?':
1334 err("Unknown option\n"); 2016 err("Unknown option '%c' or argument missing", optopt);
1335 default: 2017 default:
1336 err("Unhandled option '%c'", i); 2018 err("Unhandled option '%c'; please report this", i);
1337 }
1338 } 2019 }
1339 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);
1340 /* let the format option override all other options */ 2030 /* let the format option override all other options */
1341 if (out_format) { 2031 if (out_format) {
1342 show_pax = show_phdr = show_textrel = show_rpath = \ 2032 show_pax = show_phdr = show_textrel = show_rpath = \
1343 show_needed = show_interp = show_bind = show_soname = \ 2033 show_needed = show_interp = show_bind = show_soname = \
1344 show_textrels = 0; 2034 show_textrels = show_perms = show_endian = show_size = \
2035 show_osabi = show_eabi = 0;
1345 for (i = 0; out_format[i]; ++i) { 2036 for (i = 0; out_format[i]; ++i) {
1346 if (!IS_MODIFIER(out_format[i])) continue; 2037 if (!IS_MODIFIER(out_format[i])) continue;
1347 2038
1348 switch (out_format[++i]) { 2039 switch (out_format[++i]) {
2040 case '+': break;
1349 case '%': break; 2041 case '%': break;
1350 case '#': break; 2042 case '#': break;
1351 case 'F': break; 2043 case 'F': break;
1352 case 'p': break; 2044 case 'p': break;
1353 case 'f': break; 2045 case 'f': break;
2046 case 'k': break;
1354 case 's': break; 2047 case 's': break;
1355 case 'N': break; 2048 case 'N': break;
1356 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;
1357 case 'x': show_pax = 1; break; 2057 case 'x': show_pax = 1; break;
1358 case 'e': show_phdr = 1; break; 2058 case 'e': show_phdr = 1; break;
1359 case 't': show_textrel = 1; break; 2059 case 't': show_textrel = 1; break;
1360 case 'r': show_rpath = 1; break; 2060 case 'r': show_rpath = 1; break;
1361 case 'n': show_needed = 1; break; 2061 case 'n': show_needed = 1; break;
1362 case 'i': show_interp = 1; break; 2062 case 'i': show_interp = 1; break;
1363 case 'b': show_bind = 1; break; 2063 case 'b': show_bind = 1; break;
1364 case 'S': show_soname = 1; break; 2064 case 'S': show_soname = 1; break;
1365 case 'T': show_textrels = 1; break; 2065 case 'T': show_textrels = 1; break;
1366 default: 2066 default:
1367 err("Invalid format specifier '%c' (byte %i)", 2067 err("Invalid format specifier '%c' (byte %i)",
1368 out_format[i], i+1); 2068 out_format[i], i+1);
1369 } 2069 }
1370 } 2070 }
1371 2071
1372 /* construct our default format */ 2072 /* construct our default format */
1373 } else { 2073 } else {
1374 size_t fmt_len = 30; 2074 size_t fmt_len = 30;
1375 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2075 out_format = xmalloc(sizeof(char) * fmt_len);
2076 *out_format = '\0';
1376 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2077 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1377 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);
1378 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2084 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1379 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2085 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1380 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2086 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1381 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2087 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1382 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2088 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1383 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2089 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1384 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2090 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1385 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2091 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1386 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);
1387 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2094 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1388 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2095 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1389 } 2096 }
1390 if (be_verbose > 2) printf("Format: %s\n", out_format); 2097 if (be_verbose > 2) printf("Format: %s\n", out_format);
1391 2098
1392 /* now lets actually do the scanning */ 2099 /* now lets actually do the scanning */
1393 if (scan_ldpath || use_ldcache) 2100 if (scan_ldpath || use_ldcache)
1394 load_ld_so_conf(); 2101 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1395 if (scan_ldpath) scanelf_ldpath(); 2102 if (scan_ldpath) scanelf_ldpath();
1396 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 = "-";
1397 if (from_file) { 2106 if (from_file) {
1398 scanelf_from_file(from_file); 2107 scanelf_from_file(from_file);
1399 from_file = *argv; 2108 from_file = *argv;
1400 } 2109 }
1401 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2110 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1402 err("Nothing to scan !?"); 2111 err("Nothing to scan !?");
1403 while (optind < argc) { 2112 while (optind < argc) {
1404 search_path = argv[optind++]; 2113 search_path = argv[optind++];
1405 scanelf_dir(search_path); 2114 ret = scanelf_dir(search_path);
1406 } 2115 }
1407 2116
1408 /* clean up */ 2117 /* clean up */
1409 if (versioned_symname) free(versioned_symname);
1410 for (i = 0; ldpaths[i]; ++i)
1411 free(ldpaths[i]); 2118 xarrayfree(ldpaths);
2119 xarrayfree(find_lib_arr);
2120 xarrayfree(find_section_arr);
2121 free(find_lib);
2122 free(find_section);
1412 2123
1413 if (ldcache != 0) 2124 if (ldcache != 0)
1414 munmap(ldcache, ldcache_size); 2125 munmap(ldcache, ldcache_size);
1415}
1416
1417
1418
1419/* utility funcs */
1420static char *xstrdup(const char *s)
1421{
1422 char *ret = strdup(s);
1423 if (!ret) err("Could not strdup(): %s", strerror(errno));
1424 return ret; 2126 return ret;
1425} 2127}
1426static void *xmalloc(size_t size)
1427{
1428 void *ret = malloc(size);
1429 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1430 return ret;
1431}
1432static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1433{
1434 size_t new_len;
1435 2128
1436 new_len = strlen(*dst) + strlen(src); 2129static char **get_split_env(const char *envvar)
1437 if (*curr_len <= new_len) {
1438 *curr_len = new_len + (*curr_len / 2);
1439 *dst = realloc(*dst, *curr_len);
1440 if (!*dst)
1441 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1442 }
1443
1444 if (n)
1445 strncat(*dst, src, n);
1446 else
1447 strcat(*dst, src);
1448}
1449static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1450{ 2130{
1451 static char my_app[2]; 2131 const char *delims = " \t\n";
1452 my_app[0] = append; 2132 char **envvals = NULL;
1453 my_app[1] = '\0'; 2133 char *env, *s;
1454 xstrcat(dst, my_app, curr_len); 2134 int nentry;
1455}
1456 2135
2136 if ((env = getenv(envvar)) == NULL)
2137 return NULL;
1457 2138
2139 env = xstrdup(env);
2140 if (env == NULL)
2141 return NULL;
2142
2143 s = strtok(env, delims);
2144 if (s == NULL) {
2145 free(env);
2146 return NULL;
2147 }
2148
2149 nentry = 0;
2150 while (s != NULL) {
2151 ++nentry;
2152 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2153 envvals[nentry-1] = s;
2154 s = strtok(NULL, delims);
2155 }
2156 envvals[nentry] = NULL;
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}
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
1458 2180
1459int main(int argc, char *argv[]) 2181int main(int argc, char *argv[])
1460{ 2182{
2183 int ret;
1461 if (argc < 2) 2184 if (argc < 2)
1462 usage(EXIT_FAILURE); 2185 usage(EXIT_FAILURE);
2186 parseenv();
1463 parseargs(argc, argv); 2187 ret = parseargs(argc, argv);
1464 fclose(stdout); 2188 fclose(stdout);
1465#ifdef __BOUNDS_CHECKING_ON 2189#ifdef __PAX_UTILS_CLEANUP
1466 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");
1467#endif 2194#endif
1468 return EXIT_SUCCESS; 2195 return ret;
1469} 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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