/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.159 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 1.159 2006/10/29 16:20:54 vapier Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.229 2011/09/27 19:29:19 vapier Exp $
5 * 5 *
6 * Copyright 2003-2006 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 1.159 2006/10/29 16:20:54 vapier Exp $";
13#define argv0 "scanelf"
14
15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
16
17#define do_state(option, flag) \
18 if (islower(option)) { \
19 flags &= ~PF_##flag; \
20 flags |= PF_NO##flag; \
21 } else { \
22 flags &= ~PF_NO##flag; \
23 flags |= PF_##flag; \
24 }
25
26 16
27/* prototypes */ 17/* prototypes */
28static int file_matches_list(const char *filename, char **matchlist); 18static int file_matches_list(const char *filename, char **matchlist);
29static int scanelf_elfobj(elfobj *elf);
30static int scanelf_elf(const char *filename, int fd, size_t len);
31static int scanelf_archive(const char *filename, int fd, size_t len);
32static void scanelf_file(const char *filename);
33static void scanelf_dir(const char *path);
34static void scanelf_ldpath(void);
35static void scanelf_envpath(void);
36static void usage(int status);
37static char **get_split_env(const char *envvar);
38static void parseenv(void);
39static void parseargs(int argc, char *argv[]);
40static char *xstrdup(const char *s);
41static void *xmalloc(size_t size);
42static void *xrealloc(void *ptr, size_t size);
43static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
44#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
45static inline void xchrcat(char **dst, const char append, size_t *curr_len);
46 19
47/* variables to control behavior */ 20/* variables to control behavior */
48static char match_etypes[126] = ""; 21static char *match_etypes = NULL;
49static char *ldpaths[256]; 22static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
50static char scan_ldpath = 0; 23static char scan_ldpath = 0;
51static char scan_envpath = 0; 24static char scan_envpath = 0;
52static char scan_symlink = 1; 25static char scan_symlink = 1;
53static char scan_archives = 0; 26static char scan_archives = 0;
54static char dir_recurse = 0; 27static char dir_recurse = 0;
55static char dir_crossmount = 1; 28static char dir_crossmount = 1;
56static char show_pax = 0; 29static char show_pax = 0;
30static char show_perms = 0;
31static char show_size = 0;
57static char show_phdr = 0; 32static char show_phdr = 0;
58static char show_textrel = 0; 33static char show_textrel = 0;
59static char show_rpath = 0; 34static char show_rpath = 0;
60static char show_needed = 0; 35static char show_needed = 0;
61static char show_interp = 0; 36static char show_interp = 0;
62static char show_bind = 0; 37static char show_bind = 0;
63static char show_soname = 0; 38static char show_soname = 0;
64static char show_textrels = 0; 39static char show_textrels = 0;
65static char show_banner = 1; 40static char show_banner = 1;
41static char show_endian = 0;
42static char show_osabi = 0;
43static char show_eabi = 0;
66static char be_quiet = 0; 44static char be_quiet = 0;
67static char be_verbose = 0; 45static char be_verbose = 0;
68static char be_wewy_wewy_quiet = 0; 46static char be_wewy_wewy_quiet = 0;
69static char be_semi_verbose = 0; 47static char be_semi_verbose = 0;
70static char *find_sym = NULL, *versioned_symname = NULL; 48static char *find_sym = NULL;
71static char *find_lib = NULL; 49static char *find_lib = NULL;
50static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
72static char *find_section = NULL; 51static char *find_section = NULL;
52static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
73static char *out_format = NULL; 53static char *out_format = NULL;
74static char *search_path = NULL; 54static char *search_path = NULL;
75static char fix_elf = 0; 55static char fix_elf = 0;
76static char gmatch = 0; 56static char g_match = 0;
77static char use_ldcache = 0; 57static char use_ldcache = 0;
78 58
79static char **qa_textrels = NULL; 59static char **qa_textrels = NULL;
80static char **qa_execstack = NULL; 60static char **qa_execstack = NULL;
81static char **qa_wx_load = NULL; 61static char **qa_wx_load = NULL;
62static char *root;
82 63
83int match_bits = 0; 64static int match_bits = 0;
84caddr_t ldcache = 0; 65static unsigned int match_perms = 0;
66static void *ldcache = NULL;
85size_t ldcache_size = 0; 67static size_t ldcache_size = 0;
86unsigned long setpax = 0UL; 68static unsigned long setpax = 0UL;
87 69
70static int has_objdump = 0;
88 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}
89 119
90/* sub-funcs for scanelf_file() */ 120/* sub-funcs for scanelf_file() */
91static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 121static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
92{ 122{
93 /* 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
94#define GET_SYMTABS(B) \ 132#define GET_SYMTABS(B) \
95 if (elf->elf_class == ELFCLASS ## B) { \ 133 if (elf->elf_class == ELFCLASS ## B) { \
96 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
97 /* debug sections */ \
98 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
99 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
100 /* runtime sections */ \
101 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
102 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
103 if (symtab && dynsym) { \ 134 if (symtab && dynsym) { \
135 Elf ## B ## _Shdr *esymtab = symtab; \
136 Elf ## B ## _Shdr *edynsym = dynsym; \
104 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 137 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
105 } else { \ 138 } else \
106 *sym = (void*)(symtab ? symtab : dynsym); \ 139 *sym = symtab ? symtab : dynsym; \
107 } \
108 if (strtab && dynstr) { \ 140 if (strtab && dynstr) { \
141 Elf ## B ## _Shdr *estrtab = strtab; \
142 Elf ## B ## _Shdr *edynstr = dynstr; \
109 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ 143 *tab = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
110 } else { \ 144 } else \
111 *tab = (void*)(strtab ? strtab : dynstr); \ 145 *tab = strtab ? strtab : dynstr; \
112 } \
113 } 146 }
114 GET_SYMTABS(32) 147 GET_SYMTABS(32)
115 GET_SYMTABS(64) 148 GET_SYMTABS(64)
116} 149}
117 150
146 } \ 179 } \
147 } 180 }
148 SHOW_PAX(32) 181 SHOW_PAX(32)
149 SHOW_PAX(64) 182 SHOW_PAX(64)
150 } 183 }
151
152 184
153 if (fix_elf && setpax) { 185 if (fix_elf && setpax) {
154 /* set the chpax settings */ 186 /* set the chpax settings */
155 if (elf->elf_class == ELFCLASS32) { 187 if (elf->elf_class == ELFCLASS32) {
156 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC) 188 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
215 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 247 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
216 found = found_relro; \ 248 found = found_relro; \
217 offset = 4; \ 249 offset = 4; \
218 check_flags = PF_X; \ 250 check_flags = PF_X; \
219 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 251 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
220 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \ 252 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
221 if (multi_load++ > max_pt_load) \ 253 if (multi_load++ > max_pt_load) \
222 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); \
223 if (file_matches_list(elf->filename, qa_wx_load)) \ 255 if (file_matches_list(elf->filename, qa_wx_load)) \
224 continue; \ 256 continue; \
225 found = found_load; \ 257 found = found_load; \
242 } else if (elf->shdr != NULL) { \ 274 } else if (elf->shdr != NULL) { \
243 /* no program headers which means this is prob an object file */ \ 275 /* no program headers which means this is prob an object file */ \
244 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 276 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
245 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 277 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
246 char *str; \ 278 char *str; \
247 if ((void*)strtbl > (void*)elf->data_end) \ 279 if ((void*)strtbl > elf->data_end) \
248 goto skip_this_shdr##B; \ 280 goto skip_this_shdr##B; \
249 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 281 check_flags = SHF_WRITE|SHF_EXECINSTR; \
250 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 282 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
251 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 283 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
252 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 284 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
283 return NULL; 315 return NULL;
284 else 316 else
285 return ret; 317 return ret;
286} 318}
287 319
320/*
321 * See if this ELF contains a DT_TEXTREL tag in any of its
322 * PT_DYNAMIC sections.
323 */
288static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 324static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
289{ 325{
290 static const char *ret = "TEXTREL"; 326 static const char *ret = "TEXTREL";
291 unsigned long i; 327 unsigned long i;
292 328
300 Elf ## B ## _Dyn *dyn; \ 336 Elf ## B ## _Dyn *dyn; \
301 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 337 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
302 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 338 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
303 Elf ## B ## _Off offset; \ 339 Elf ## B ## _Off offset; \
304 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 340 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
305 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; \
306 offset = EGET(phdr[i].p_offset); \ 342 offset = EGET(phdr[i].p_offset); \
307 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 343 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
308 dyn = DYN ## B (elf->data + offset); \ 344 dyn = DYN ## B (elf->vdata + offset); \
309 while (EGET(dyn->d_tag) != DT_NULL) { \ 345 while (EGET(dyn->d_tag) != DT_NULL) { \
310 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)*/ \
311 *found_textrel = 1; \ 347 *found_textrel = 1; \
312 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 348 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
313 return (be_wewy_wewy_quiet ? NULL : ret); \ 349 return (be_wewy_wewy_quiet ? NULL : ret); \
322 if (be_quiet || be_wewy_wewy_quiet) 358 if (be_quiet || be_wewy_wewy_quiet)
323 return NULL; 359 return NULL;
324 else 360 else
325 return " - "; 361 return " - ";
326} 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 */
327static 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)
328{ 370{
329 unsigned long s, r, rmax; 371 unsigned long s, r, rmax;
330 void *symtab_void, *strtab_void, *text_void; 372 void *symtab_void, *strtab_void, *text_void;
331 373
352 Elf ## B ## _Rela *rela; \ 394 Elf ## B ## _Rela *rela; \
353 /* search the section headers for relocations */ \ 395 /* search the section headers for relocations */ \
354 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 396 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
355 uint32_t sh_type = EGET(shdr[s].sh_type); \ 397 uint32_t sh_type = EGET(shdr[s].sh_type); \
356 if (sh_type == SHT_REL) { \ 398 if (sh_type == SHT_REL) { \
357 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 399 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
358 rela = NULL; \ 400 rela = NULL; \
359 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 401 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
360 } else if (sh_type == SHT_RELA) { \ 402 } else if (sh_type == SHT_RELA) { \
361 rel = NULL; \ 403 rel = NULL; \
362 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 404 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
363 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 405 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
364 } else \ 406 } else \
365 continue; \ 407 continue; \
366 /* now see if any of the relocs are in the .text */ \ 408 /* now see if any of the relocs are in the .text */ \
367 for (r = 0; r < rmax; ++r) { \ 409 for (r = 0; r < rmax; ++r) { \
382 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 424 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
383 if (be_verbose <= 2) continue; \ 425 if (be_verbose <= 2) continue; \
384 } else \ 426 } else \
385 *found_textrels = 1; \ 427 *found_textrels = 1; \
386 /* locate this relocation symbol name */ \ 428 /* locate this relocation symbol name */ \
387 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 429 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
388 if ((void*)sym > (void*)elf->data_end) { \ 430 if ((void*)sym > elf->data_end) { \
389 warn("%s: corrupt ELF symbol", elf->filename); \ 431 warn("%s: corrupt ELF symbol", elf->filename); \
390 continue; \ 432 continue; \
391 } \ 433 } \
392 sym_max = ELF ## B ## _R_SYM(r_info); \ 434 sym_max = ELF ## B ## _R_SYM(r_info); \
393 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 435 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
396 sym = NULL; \ 438 sym = NULL; \
397 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 439 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
398 /* show the raw details about this reloc */ \ 440 /* show the raw details about this reloc */ \
399 printf(" %s: ", elf->base_filename); \ 441 printf(" %s: ", elf->base_filename); \
400 if (sym && sym->st_name) \ 442 if (sym && sym->st_name) \
401 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)); \
402 else \ 444 else \
403 printf("(memory/fake?)"); \ 445 printf("(memory/data?)"); \
404 printf(" [0x%lX]", (unsigned long)r_offset); \ 446 printf(" [0x%lX]", (unsigned long)r_offset); \
405 /* 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 */ \
406 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 448 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
407 func = NULL; \ 449 func = NULL; \
408 offset_tmp = 0; \ 450 offset_tmp = 0; \
409 while (sym_max--) { \ 451 while (sym_max--) { \
410 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) { \
411 func = sym; \ 453 func = sym; \
412 offset_tmp = EGET(sym->st_value); \ 454 offset_tmp = EGET(sym->st_value); \
413 } \ 455 } \
414 ++sym; \ 456 ++sym; \
415 } \ 457 } \
416 printf(" in "); \ 458 printf(" in "); \
417 if (func && func->st_name) \ 459 if (func && func->st_name) { \
418 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); \
419 else \ 463 else \
420 printf("(NULL: fake?)"); \ 464 printf("%s", func_name); \
465 } else \
466 printf("(optimized out)"); \
421 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 } \
422 } \ 489 } \
423 } } 490 } }
424 SHOW_TEXTRELS(32) 491 SHOW_TEXTRELS(32)
425 SHOW_TEXTRELS(64) 492 SHOW_TEXTRELS(64)
426 } 493 }
428 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);
429 496
430 return NULL; 497 return NULL;
431} 498}
432 499
433static void rpath_security_checks(elfobj *, char *, const char *);
434static 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)
435{ 501{
436 struct stat st; 502 struct stat st;
437 switch (*item) { 503 switch (*item) {
438 case '/': break; 504 case '/': break;
445 break; 511 break;
446 case '$': 512 case '$':
447 if (fstat(elf->fd, &st) != -1) 513 if (fstat(elf->fd, &st) != -1)
448 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 514 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
449 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",
450 dt_type, item, elf->filename, st.st_mode & 07777); 516 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
451 break; 517 break;
452 default: 518 default:
453 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);
454 break; 520 break;
455 } 521 }
456} 522}
457static 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)
458{ 524{
459 unsigned long i, s; 525 unsigned long i;
460 char *rpath, *runpath, **r; 526 char *rpath, *runpath, **r;
461 void *strtbl_void; 527 void *strtbl_void;
462 528
463 if (!show_rpath) return; 529 if (!show_rpath) return;
464 530
475 Elf ## B ## _Off offset; \ 541 Elf ## B ## _Off offset; \
476 Elf ## B ## _Xword word; \ 542 Elf ## B ## _Xword word; \
477 /* Scan all the program headers */ \ 543 /* Scan all the program headers */ \
478 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 544 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
479 /* Just scan dynamic headers */ \ 545 /* Just scan dynamic headers */ \
480 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; \
481 offset = EGET(phdr[i].p_offset); \ 547 offset = EGET(phdr[i].p_offset); \
482 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 548 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
483 /* Just scan dynamic RPATH/RUNPATH headers */ \ 549 /* Just scan dynamic RPATH/RUNPATH headers */ \
484 dyn = DYN ## B (elf->data + offset); \ 550 dyn = DYN ## B (elf->vdata + offset); \
485 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 551 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
486 if (word == DT_RPATH) { \ 552 if (word == DT_RPATH) { \
487 r = &rpath; \ 553 r = &rpath; \
488 } else if (word == DT_RUNPATH) { \ 554 } else if (word == DT_RUNPATH) { \
489 r = &runpath; \ 555 r = &runpath; \
493 } \ 559 } \
494 /* Verify the memory is somewhat sane */ \ 560 /* Verify the memory is somewhat sane */ \
495 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 561 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
496 if (offset < (Elf ## B ## _Off)elf->len) { \ 562 if (offset < (Elf ## B ## _Off)elf->len) { \
497 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 563 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
498 *r = (char*)(elf->data + offset); \ 564 *r = elf->data + offset; \
499 /* 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 */ \
500 if (fix_elf) \ 566 if (fix_elf) \
501 offset = strlen(*r); \ 567 offset = strlen(*r); \
502 /* If quiet, don't output paths in ld.so.conf */ \ 568 /* If quiet, don't output paths in ld.so.conf */ \
503 if (be_quiet) { \ 569 if (be_quiet) { \
509 /* scan each path in : delimited list */ \ 575 /* scan each path in : delimited list */ \
510 while (start) { \ 576 while (start) { \
511 rpath_security_checks(elf, start, get_elfdtype(word)); \ 577 rpath_security_checks(elf, start, get_elfdtype(word)); \
512 end = strchr(start, ':'); \ 578 end = strchr(start, ':'); \
513 len = (end ? abs(end - start) : strlen(start)); \ 579 len = (end ? abs(end - start) : strlen(start)); \
514 if (use_ldcache) \ 580 if (use_ldcache) { \
515 for (s = 0; ldpaths[s]; ++s) \ 581 size_t n; \
582 const char *ldpath; \
583 array_for_each(ldpaths, n, ldpath) \
516 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 584 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
517 *r = end; \ 585 *r = end; \
518 /* corner case ... if RPATH reads "/usr/lib:", we want \ 586 /* corner case ... if RPATH reads "/usr/lib:", we want \
519 * to show ':' rather than '' */ \ 587 * to show ':' rather than '' */ \
520 if (end && end[1] != '\0') \ 588 if (end && end[1] != '\0') \
521 (*r)++; \ 589 (*r)++; \
522 break; \ 590 break; \
523 } \ 591 } \
592 } \
524 if (!*r || !end) \ 593 if (!*r || !end) \
525 break; \ 594 break; \
526 else \ 595 else \
527 start = start + len + 1; \ 596 start = start + len + 1; \
528 } \ 597 } \
613#define FLAG_S390_LIB64 0x0400 682#define FLAG_S390_LIB64 0x0400
614#define FLAG_POWERPC_LIB64 0x0500 683#define FLAG_POWERPC_LIB64 0x0500
615#define FLAG_MIPS64_LIBN32 0x0600 684#define FLAG_MIPS64_LIBN32 0x0600
616#define FLAG_MIPS64_LIBN64 0x0700 685#define FLAG_MIPS64_LIBN64 0x0700
617 686
618static char *lookup_cache_lib(elfobj *, char *);
619
620#if defined(__GLIBC__) || defined(__UCLIBC__) 687#if defined(__GLIBC__) || defined(__UCLIBC__)
621 688
622static char *lookup_cache_lib(elfobj *elf, char *fname) 689static char *lookup_cache_lib(elfobj *elf, char *fname)
623{ 690{
624 int fd = 0; 691 int fd;
625 char *strs; 692 char *strs;
626 static char buf[__PAX_UTILS_PATH_MAX] = ""; 693 static char buf[__PAX_UTILS_PATH_MAX] = "";
627 const char *cachefile = "/etc/ld.so.cache"; 694 const char cachefile[] = "/etc/ld.so.cache";
628 struct stat st; 695 struct stat st;
629 696
630 typedef struct { 697 typedef struct {
631 char magic[LDSO_CACHE_MAGIC_LEN]; 698 char magic[LDSO_CACHE_MAGIC_LEN];
632 char version[LDSO_CACHE_VER_LEN]; 699 char version[LDSO_CACHE_VER_LEN];
642 libentry_t *libent; 709 libentry_t *libent;
643 710
644 if (fname == NULL) 711 if (fname == NULL)
645 return NULL; 712 return NULL;
646 713
647 if (ldcache == 0) { 714 if (ldcache == NULL) {
648 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)
649 return NULL; 720 return NULL;
650 721
651 /* 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 */
652 ldcache_size = st.st_size; 723 ldcache_size = st.st_size;
653 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0); 724 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
654
655 close(fd); 725 close(fd);
656 726
657 if (ldcache == (caddr_t)-1) { 727 if (ldcache == MAP_FAILED) {
658 ldcache = 0; 728 ldcache = NULL;
659 return NULL; 729 return NULL;
660 } 730 }
661 731
662 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;
663 return NULL; 737 return NULL;
664 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
665 return NULL;
666 } 738 }
739 } else
740 header = ldcache;
667 741
668 header = (header_t *) ldcache;
669 libent = (libentry_t *) (ldcache + sizeof(header_t)); 742 libent = ldcache + sizeof(header_t);
670 strs = (char *) &libent[header->nlibs]; 743 strs = (char *) &libent[header->nlibs];
671 744
672 for (fd = 0; fd < header->nlibs; fd++) { 745 for (fd = 0; fd < header->nlibs; ++fd) {
673 /* 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
674 * diff arches will not be cached together. and we ignore the 747 * diff arches will not be cached together, and we ignore the
675 * the different multilib mips cases. */ 748 * the different multilib mips cases.
749 */
676 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK)) 750 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
677 continue; 751 continue;
678 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK)) 752 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
679 continue; 753 continue;
680 754
681 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 755 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
682 continue; 756 continue;
757
758 /* Return first hit because that is how the ldso rolls */
683 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 759 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
760 break;
684 } 761 }
762
685 return buf; 763 return buf;
686} 764}
765
687#elif defined(__NetBSD__) 766#elif defined(__NetBSD__)
688static char *lookup_cache_lib(elfobj *elf, char *fname) 767static char *lookup_cache_lib(elfobj *elf, char *fname)
689{ 768{
690 static char buf[__PAX_UTILS_PATH_MAX] = ""; 769 static char buf[__PAX_UTILS_PATH_MAX] = "";
691 static struct stat st; 770 static struct stat st;
692 771 size_t n;
693 char **ldpath; 772 char *ldpath;
694 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) { 773
774 array_for_each(ldpath, n, ldpath) {
695 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf)) 775 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
696 continue; /* if the pathname is too long, or something went wrong, ignore */ 776 continue; /* if the pathname is too long, or something went wrong, ignore */
697 777
698 if (stat(buf, &st) != 0) 778 if (stat(buf, &st) != 0)
699 continue; /* if the lib doesn't exist in *ldpath, look further */ 779 continue; /* if the lib doesn't exist in *ldpath, look further */
700 780
708 788
709 /* not found in any path */ 789 /* not found in any path */
710 return NULL; 790 return NULL;
711} 791}
712#else 792#else
793#ifdef __ELF__
713#warning Cache support not implemented for your target 794#warning Cache support not implemented for your target
795#endif
714static char *lookup_cache_lib(elfobj *elf, char *fname) 796static char *lookup_cache_lib(elfobj *elf, char *fname)
715{ 797{
716 return NULL; 798 return NULL;
717} 799}
718#endif 800#endif
722 unsigned long i; 804 unsigned long i;
723 char *needed; 805 char *needed;
724 void *strtbl_void; 806 void *strtbl_void;
725 char *p; 807 char *p;
726 808
809 /*
810 * -n -> op==0 -> print all
811 * -N -> op==1 -> print requested
812 */
727 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 813 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
814 return NULL;
728 815
729 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 816 strtbl_void = elf_findsecbyname(elf, ".dynstr");
730 817
731 if (elf->phdr && strtbl_void) { 818 if (elf->phdr && strtbl_void) {
732#define SHOW_NEEDED(B) \ 819#define SHOW_NEEDED(B) \
734 Elf ## B ## _Dyn *dyn; \ 821 Elf ## B ## _Dyn *dyn; \
735 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 822 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
736 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 823 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
737 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 824 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
738 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 */ \
739 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 828 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
740 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; \
741 offset = EGET(phdr[i].p_offset); \ 831 offset = EGET(phdr[i].p_offset); \
742 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 */ \
743 dyn = DYN ## B (elf->data + offset); \ 835 dyn = DYN ## B (elf->vdata + offset); \
744 while (EGET(dyn->d_tag) != DT_NULL) { \ 836 while (EGET(dyn->d_tag) != DT_NULL) { \
745 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 837 if (EGET(dyn->d_tag) == DT_NEEDED) { \
746 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 838 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
747 if (offset >= (Elf ## B ## _Off)elf->len) { \ 839 if (offset >= (Elf ## B ## _Off)elf->len) { \
748 ++dyn; \ 840 ++dyn; \
749 continue; \ 841 continue; \
750 } \ 842 } \
751 needed = (char*)(elf->data + offset); \ 843 needed = elf->data + offset; \
752 if (op == 0) { \ 844 if (op == 0) { \
845 /* -n -> print all entries */ \
753 if (!be_wewy_wewy_quiet) { \ 846 if (!be_wewy_wewy_quiet) { \
754 if (*found_needed) xchrcat(ret, ',', ret_len); \ 847 if (*found_needed) xchrcat(ret, ',', ret_len); \
755 if (use_ldcache) \ 848 if (use_ldcache) \
756 if ((p = lookup_cache_lib(elf, needed)) != NULL) \ 849 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
757 needed = p; \ 850 needed = p; \
758 xstrcat(ret, needed, ret_len); \ 851 xstrcat(ret, needed, ret_len); \
759 } \ 852 } \
760 *found_needed = 1; \ 853 *found_needed = 1; \
761 } else { \ 854 } else { \
762 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)) { \
763 *found_lib = 1; \ 864 *found_lib = 1; \
764 return (be_wewy_wewy_quiet ? NULL : needed); \ 865 return (be_wewy_wewy_quiet ? NULL : find_lib); \
765 } \ 866 } \
766 } \ 867 } \
767 } \ 868 } \
768 ++dyn; \ 869 ++dyn; \
769 } \ 870 } \
810 Elf ## B ## _Dyn *dyn; \ 911 Elf ## B ## _Dyn *dyn; \
811 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 912 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
812 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 913 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
813 Elf ## B ## _Off offset; \ 914 Elf ## B ## _Off offset; \
814 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 915 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
815 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; \
816 dynamic = 1; \ 917 dynamic = 1; \
817 offset = EGET(phdr[i].p_offset); \ 918 offset = EGET(phdr[i].p_offset); \
818 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 919 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
819 dyn = DYN ## B (elf->data + offset); \ 920 dyn = DYN ## B (elf->vdata + offset); \
820 while (EGET(dyn->d_tag) != DT_NULL) { \ 921 while (EGET(dyn->d_tag) != DT_NULL) { \
821 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 922 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
822 (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)) \
823 { \ 924 { \
824 if (be_quiet) return NULL; \ 925 if (be_quiet) return NULL; \
837 /* don't output anything if quiet mode and the ELF is static or not setuid */ 938 /* don't output anything if quiet mode and the ELF is static or not setuid */
838 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) { 939 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
839 return NULL; 940 return NULL;
840 } else { 941 } else {
841 *found_bind = 1; 942 *found_bind = 1;
842 return (char *) (dynamic ? "LAZY" : "STATIC"); 943 return (char *)(dynamic ? "LAZY" : "STATIC");
843 } 944 }
844} 945}
845static char *scanelf_file_soname(elfobj *elf, char *found_soname) 946static char *scanelf_file_soname(elfobj *elf, char *found_soname)
846{ 947{
847 unsigned long i; 948 unsigned long i;
859 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 960 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
860 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 961 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
861 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 962 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
862 Elf ## B ## _Off offset; \ 963 Elf ## B ## _Off offset; \
863 /* only look for soname in shared objects */ \ 964 /* only look for soname in shared objects */ \
864 if (ehdr->e_type != ET_DYN) \ 965 if (EGET(ehdr->e_type) != ET_DYN) \
865 return NULL; \ 966 return NULL; \
866 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 967 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
867 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; \
868 offset = EGET(phdr[i].p_offset); \ 969 offset = EGET(phdr[i].p_offset); \
869 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 970 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
870 dyn = DYN ## B (elf->data + offset); \ 971 dyn = DYN ## B (elf->vdata + offset); \
871 while (EGET(dyn->d_tag) != DT_NULL) { \ 972 while (EGET(dyn->d_tag) != DT_NULL) { \
872 if (EGET(dyn->d_tag) == DT_SONAME) { \ 973 if (EGET(dyn->d_tag) == DT_SONAME) { \
873 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 974 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
874 if (offset >= (Elf ## B ## _Off)elf->len) { \ 975 if (offset >= (Elf ## B ## _Off)elf->len) { \
875 ++dyn; \ 976 ++dyn; \
876 continue; \ 977 continue; \
877 } \ 978 } \
878 soname = (char*)(elf->data + offset); \ 979 soname = elf->data + offset; \
879 *found_soname = 1; \ 980 *found_soname = 1; \
880 return (be_wewy_wewy_quiet ? NULL : soname); \ 981 return (be_wewy_wewy_quiet ? NULL : soname); \
881 } \ 982 } \
882 ++dyn; \ 983 ++dyn; \
883 } \ 984 } \
886 SHOW_SONAME(64) 987 SHOW_SONAME(64)
887 } 988 }
888 989
889 return NULL; 990 return NULL;
890} 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
891static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1160static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
892{ 1161{
893 unsigned long i; 1162 unsigned long i;
894 char *ret; 1163 char *ret;
895 void *symtab_void, *strtab_void; 1164 void *symtab_void, *strtab_void;
896 1165
897 if (!find_sym) return NULL; 1166 if (!find_sym) return NULL;
898 ret = find_sym; 1167 ret = NULL;
899 1168
900 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1169 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
901 1170
902 if (symtab_void && strtab_void) { 1171 if (symtab_void && strtab_void) {
903#define FIND_SYM(B) \ 1172#define FIND_SYM(B) \
904 if (elf->elf_class == ELFCLASS ## B) { \ 1173 if (elf->elf_class == ELFCLASS ## B) { \
905 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1174 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
906 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1175 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
907 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)); \
908 unsigned long cnt = EGET(symtab->sh_entsize); \ 1177 unsigned long cnt = EGET(symtab->sh_entsize); \
909 char *symname; \ 1178 char *symname; \
1179 size_t ret_len = 0; \
910 if (cnt) \ 1180 if (cnt) \
911 cnt = EGET(symtab->sh_size) / cnt; \ 1181 cnt = EGET(symtab->sh_size) / cnt; \
912 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 } \
913 if (sym->st_name) { \ 1187 if (sym->st_name) { \
914 /* make sure the symbol name is in acceptable memory range */ \ 1188 /* make sure the symbol name is in acceptable memory range */ \
915 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1189 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
916 if ((void*)symname > (void*)elf->data_end) { \ 1190 if ((void*)symname > elf->data_end) { \
917 warnf("%s: corrupt ELF symbols", elf->filename); \ 1191 warnf("%s: corrupt ELF symbols", elf->filename); \
918 ++sym; \ 1192 ++sym; \
919 continue; \ 1193 continue; \
920 } \ 1194 } \
921 /* debug display ... show all symbols and some extra info */ \ 1195 scanelf_match_symname(elf, found_sym, \
922 if (*ret == '*') { \ 1196 &ret, &ret_len, symname, \
923 printf("%s(%s) %5lX %15s %s\n", \ 1197 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
924 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1198 ELF##B##_ST_BIND(EGET(sym->st_info)), \
925 elf->base_filename, \ 1199 EGET(sym->st_shndx), \
926 (unsigned long)sym->st_size, \ 1200 /* st_size can be 64bit, but no one is really that big, so screw em */ \
927 get_elfstttype(sym->st_info), \ 1201 EGET(sym->st_size)); \
928 symname); \
929 *found_sym = 1; \
930 } else { \
931 /* allow the user to specify a comma delimited list of symbols to search for */ \
932 char *this_sym, *this_sym_ver, *next_sym; \
933 this_sym = ret; \
934 this_sym_ver = versioned_symname; \
935 do { \
936 next_sym = strchr(this_sym, ','); \
937 if (next_sym == NULL) \
938 next_sym = this_sym + strlen(this_sym); \
939 /* do we want a defined symbol ? */ \
940 if (*this_sym == '+') { \
941 if (sym->st_shndx == SHN_UNDEF) \
942 goto skip_this_sym##B; \
943 ++this_sym; \
944 ++this_sym_ver; \
945 /* do we want an undefined symbol ? */ \
946 } else if (*this_sym == '-') { \
947 if (sym->st_shndx != SHN_UNDEF) \
948 goto skip_this_sym##B; \
949 ++this_sym; \
950 ++this_sym_ver; \
951 } \
952 /* ok, lets compare the name now */ \
953 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
954 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
955 if (be_semi_verbose) { \
956 char buf[126]; \
957 snprintf(buf, sizeof(buf), "%lX %s %s", \
958 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
959 ret = buf; \
960 } else \
961 ret = this_sym; \
962 (*found_sym)++; \
963 goto break_out; \
964 } \
965 skip_this_sym##B: this_sym = next_sym + 1; \
966 } while (*next_sym != '\0'); \
967 } \
968 } \ 1202 } \
969 ++sym; \ 1203 ++sym; \
970 } } 1204 } }
971 FIND_SYM(32) 1205 FIND_SYM(32)
972 FIND_SYM(64) 1206 FIND_SYM(64)
978 if (*find_sym != '*' && *found_sym) 1212 if (*find_sym != '*' && *found_sym)
979 return ret; 1213 return ret;
980 if (be_quiet) 1214 if (be_quiet)
981 return NULL; 1215 return NULL;
982 else 1216 else
983 return (char *)" - "; 1217 return " - ";
984} 1218}
985 1219
986
987static char *scanelf_file_sections(elfobj *elf, char *found_section) 1220static const char *scanelf_file_sections(elfobj *elf, char *found_section)
988{ 1221{
989 if (!find_section) 1222 if (!find_section)
990 return NULL; 1223 return NULL;
991 1224
992#define FIND_SECTION(B) \ 1225#define FIND_SECTION(B) \
993 if (elf->elf_class == ELFCLASS ## B) { \ 1226 if (elf->elf_class == ELFCLASS ## B) { \
1227 size_t matched, n; \
994 int invert; \ 1228 int invert; \
1229 const char *section_name; \
995 Elf ## B ## _Shdr *section; \ 1230 Elf ## B ## _Shdr *section; \
1231 \
1232 matched = 0; \
1233 array_for_each(find_section_arr, n, section_name) { \
996 invert = (*find_section == '!' ? 1 : 0); \ 1234 invert = (*section_name == '!' ? 1 : 0); \
997 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \ 1235 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
998 if ((section == NULL && invert) || (section != NULL && !invert)) \ 1236 if ((section == NULL && invert) || (section != NULL && !invert)) \
1237 ++matched; \
1238 } \
1239 \
1240 if (matched == array_cnt(find_section_arr)) \
999 *found_section = 1; \ 1241 *found_section = 1; \
1000 } 1242 }
1001 FIND_SECTION(32) 1243 FIND_SECTION(32)
1002 FIND_SECTION(64) 1244 FIND_SECTION(64)
1003 1245
1008 return find_section; 1250 return find_section;
1009 1251
1010 if (be_quiet) 1252 if (be_quiet)
1011 return NULL; 1253 return NULL;
1012 else 1254 else
1013 return (char *)" - "; 1255 return " - ";
1014} 1256}
1015 1257
1016/* scan an elf file and show all the fun stuff */ 1258/* scan an elf file and show all the fun stuff */
1017#define prints(str) write(fileno(stdout), str, strlen(str)) 1259#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1018static int scanelf_elfobj(elfobj *elf) 1260static int scanelf_elfobj(elfobj *elf)
1019{ 1261{
1020 unsigned long i; 1262 unsigned long i;
1021 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1263 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1022 found_rpath, found_needed, found_interp, found_bind, found_soname, 1264 found_rpath, found_needed, found_interp, found_bind, found_soname,
1023 found_sym, found_lib, found_file, found_textrels, found_section; 1265 found_sym, found_lib, found_file, found_textrels, found_section;
1024 static char *out_buffer = NULL; 1266 static char *out_buffer = NULL;
1025 static size_t out_len; 1267 static size_t out_len;
1026 1268
1027 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1269 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1036 printf("%s: scanning file\n", elf->filename); 1278 printf("%s: scanning file\n", elf->filename);
1037 1279
1038 /* init output buffer */ 1280 /* init output buffer */
1039 if (!out_buffer) { 1281 if (!out_buffer) {
1040 out_len = sizeof(char) * 80; 1282 out_len = sizeof(char) * 80;
1041 out_buffer = (char*)xmalloc(out_len); 1283 out_buffer = xmalloc(out_len);
1042 } 1284 }
1043 *out_buffer = '\0'; 1285 *out_buffer = '\0';
1044 1286
1045 /* show the header */ 1287 /* show the header */
1046 if (!be_quiet && show_banner) { 1288 if (!be_quiet && show_banner) {
1057 case 'o': prints(" TYPE "); break; 1299 case 'o': prints(" TYPE "); break;
1058 case 'x': prints(" PAX "); break; 1300 case 'x': prints(" PAX "); break;
1059 case 'e': prints("STK/REL/PTL "); break; 1301 case 'e': prints("STK/REL/PTL "); break;
1060 case 't': prints("TEXTREL "); break; 1302 case 't': prints("TEXTREL "); break;
1061 case 'r': prints("RPATH "); break; 1303 case 'r': prints("RPATH "); break;
1304 case 'M': prints("CLASS "); break;
1062 case 'n': prints("NEEDED "); break; 1305 case 'n': prints("NEEDED "); break;
1063 case 'i': prints("INTERP "); break; 1306 case 'i': prints("INTERP "); break;
1064 case 'b': prints("BIND "); break; 1307 case 'b': prints("BIND "); break;
1308 case 'Z': prints("SIZE "); break;
1065 case 'S': prints("SONAME "); break; 1309 case 'S': prints("SONAME "); break;
1066 case 's': prints("SYM "); break; 1310 case 's': prints("SYM "); break;
1067 case 'N': prints("LIB "); break; 1311 case 'N': prints("LIB "); break;
1068 case 'T': prints("TEXTRELS "); break; 1312 case 'T': prints("TEXTRELS "); break;
1069 case 'k': prints("SECTION "); 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;
1070 default: warnf("'%c' has no title ?", out_format[i]); 1319 default: warnf("'%c' has no title ?", out_format[i]);
1071 } 1320 }
1072 } 1321 }
1073 if (!found_file) prints("FILE "); 1322 if (!found_file) prints("FILE ");
1074 prints("\n"); 1323 prints("\n");
1078 1327
1079 /* dump all the good stuff */ 1328 /* dump all the good stuff */
1080 for (i = 0; out_format[i]; ++i) { 1329 for (i = 0; out_format[i]; ++i) {
1081 const char *out; 1330 const char *out;
1082 const char *tmp; 1331 const char *tmp;
1083 1332 static char ubuf[sizeof(unsigned long)*2];
1084 if (!IS_MODIFIER(out_format[i])) { 1333 if (!IS_MODIFIER(out_format[i])) {
1085 xchrcat(&out_buffer, out_format[i], &out_len); 1334 xchrcat(&out_buffer, out_format[i], &out_len);
1086 continue; 1335 continue;
1087 } 1336 }
1088 1337
1124 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1373 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1125 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;
1126 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1375 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1127 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;
1128 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;
1129 case 'n': 1381 case 'n':
1130 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;
1131 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1383 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1132 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1384 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1133 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1385 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1134 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1386 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1135 case 'k': out = scanelf_file_sections(elf, &found_section); 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;;
1136 default: warnf("'%c' has no scan code?", out_format[i]); 1392 default: warnf("'%c' has no scan code?", out_format[i]);
1137 } 1393 }
1138 if (out) { 1394 if (out)
1139 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1140 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1141 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1142 else
1143 xstrcat(&out_buffer, out, &out_len); 1395 xstrcat(&out_buffer, out, &out_len);
1144 }
1145 } 1396 }
1146 1397
1147#define FOUND_SOMETHING() \ 1398#define FOUND_SOMETHING() \
1148 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1399 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1149 found_rpath || found_needed || found_interp || found_bind || \ 1400 found_rpath || found_needed || found_interp || found_bind || \
1181 if (elf->elf_class != ELFCLASS64) 1432 if (elf->elf_class != ELFCLASS64)
1182 goto label_done; 1433 goto label_done;
1183 break; 1434 break;
1184 default: break; 1435 default: break;
1185 } 1436 }
1186 if (strlen(match_etypes)) { 1437 if (match_etypes) {
1187 char sbuf[126]; 1438 char sbuf[126];
1188 strncpy(sbuf, match_etypes, sizeof(sbuf)); 1439 strncpy(sbuf, match_etypes, sizeof(sbuf));
1189 if (strchr(match_etypes, ',') != NULL) { 1440 if (strchr(match_etypes, ',') != NULL) {
1190 char *p; 1441 char *p;
1191 while((p = strrchr(sbuf, ',')) != NULL) { 1442 while ((p = strrchr(sbuf, ',')) != NULL) {
1192 *p = 0; 1443 *p = 0;
1193 if (etype_lookup(p+1) == get_etype(elf)) 1444 if (etype_lookup(p+1) == get_etype(elf))
1194 goto label_ret; 1445 goto label_ret;
1195 } 1446 }
1196 } 1447 }
1216 1467
1217 ar = ar_open_fd(filename, fd); 1468 ar = ar_open_fd(filename, fd);
1218 if (ar == NULL) 1469 if (ar == NULL)
1219 return 1; 1470 return 1;
1220 1471
1221 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0); 1472 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1222 while ((m=ar_next(ar)) != NULL) { 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");
1223 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size); 1477 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1224 if (elf) { 1478 if (elf) {
1225 scanelf_elfobj(elf); 1479 scanelf_elfobj(elf);
1226 unreadelf(elf); 1480 unreadelf(elf);
1227 } 1481 }
1228 } 1482 }
1229 munmap(ar_buffer, len); 1483 munmap(ar_buffer, len);
1230 1484
1231 return 0; 1485 return 0;
1232} 1486}
1233/* scan a file which may be an elf or an archive or some other magical beast */ 1487/* scan a file which may be an elf or an archive or some other magical beast */
1234static void scanelf_file(const char *filename) 1488static int scanelf_file(const char *filename, const struct stat *st_cache)
1235{ 1489{
1490 const struct stat *st = st_cache;
1236 struct stat st; 1491 struct stat symlink_st;
1237 int fd; 1492 int fd;
1238 1493
1239 /* make sure 'filename' exists */
1240 if (lstat(filename, &st) == -1) {
1241 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1242 return;
1243 }
1244
1245 /* always handle regular files and handle symlinked files if no -y */ 1494 /* always handle regular files and handle symlinked files if no -y */
1246 if (S_ISLNK(st.st_mode)) { 1495 if (S_ISLNK(st->st_mode)) {
1247 if (!scan_symlink) return; 1496 if (!scan_symlink) return 1;
1248 stat(filename, &st); 1497 stat(filename, &symlink_st);
1498 st = &symlink_st;
1249 } 1499 }
1500
1250 if (!S_ISREG(st.st_mode)) { 1501 if (!S_ISREG(st->st_mode)) {
1251 if (be_verbose > 2) printf("%s: skipping non-file\n", filename); 1502 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1252 return; 1503 return 1;
1253 } 1504 }
1254 1505
1506 if (match_perms) {
1507 if ((st->st_mode | match_perms) != st->st_mode)
1508 return 1;
1509 }
1255 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1) 1510 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1256 return; 1511 return 1;
1257 1512
1258 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives) 1513 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1259 /* if it isn't an ELF, maybe it's an .a archive */ 1514 /* if it isn't an ELF, maybe it's an .a archive */
1260 scanelf_archive(filename, fd, st.st_size); 1515 scanelf_archive(filename, fd, st->st_size);
1261 1516
1262 close(fd); 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;
1263} 1529}
1264 1530
1265/* 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 */
1266static void scanelf_dir(const char *path) 1532static int scanelf_dir(const char *path)
1267{ 1533{
1268 register DIR *dir; 1534 register DIR *dir;
1269 register struct dirent *dentry; 1535 register struct dirent *dentry;
1270 struct stat st_top, st; 1536 struct stat st_top, st;
1271 char buf[__PAX_UTILS_PATH_MAX]; 1537 char buf[__PAX_UTILS_PATH_MAX];
1538 char _path[__PAX_UTILS_PATH_MAX];
1272 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);
1273 1543
1274 /* make sure path exists */ 1544 /* make sure path exists */
1275 if (lstat(path, &st_top) == -1) { 1545 if (lstat(path, &st_top) == -1) {
1276 if (be_verbose > 2) printf("%s: does not exist\n", path); 1546 if (be_verbose > 2) printf("%s: does not exist\n", path);
1277 return; 1547 return 1;
1278 } 1548 }
1279 1549
1280 /* 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 */
1281 if (!S_ISDIR(st_top.st_mode)) { 1551 if (!S_ISDIR(st_top.st_mode)) {
1282 scanelf_file(path); 1552 return scanelf_file(path, &st_top);
1283 return;
1284 } 1553 }
1285 1554
1286 /* now scan the dir looking for fun stuff */ 1555 /* now scan the dir looking for fun stuff */
1287 if ((dir = opendir(path)) == NULL) { 1556 if ((dir = opendir(path)) == NULL) {
1288 warnf("could not opendir %s: %s", path, strerror(errno)); 1557 warnf("could not opendir %s: %s", path, strerror(errno));
1289 return; 1558 return 1;
1290 } 1559 }
1291 if (be_verbose > 1) printf("%s: scanning dir\n", path); 1560 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1292 1561
1293 pathlen = strlen(path); 1562 pathlen = strlen(path);
1294 while ((dentry = readdir(dir))) { 1563 while ((dentry = readdir(dir))) {
1301 continue; 1570 continue;
1302 } 1571 }
1303 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name); 1572 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1304 if (lstat(buf, &st) != -1) { 1573 if (lstat(buf, &st) != -1) {
1305 if (S_ISREG(st.st_mode)) 1574 if (S_ISREG(st.st_mode))
1306 scanelf_file(buf); 1575 ret = scanelf_file(buf, &st);
1307 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1576 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1308 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1577 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1309 scanelf_dir(buf); 1578 ret = scanelf_dir(buf);
1310 } 1579 }
1311 } 1580 }
1312 } 1581 }
1313 closedir(dir); 1582 closedir(dir);
1583 return ret;
1314} 1584}
1315 1585
1316static int scanelf_from_file(const char *filename) 1586static int scanelf_from_file(const char *filename)
1317{ 1587{
1318 FILE *fp = NULL; 1588 FILE *fp = NULL;
1319 char *p; 1589 char *p;
1320 char path[__PAX_UTILS_PATH_MAX]; 1590 char path[__PAX_UTILS_PATH_MAX];
1591 int ret = 0;
1321 1592
1322 if (strcmp(filename, "-") == 0) 1593 if (strcmp(filename, "-") == 0)
1323 fp = stdin; 1594 fp = stdin;
1324 else if ((fp = fopen(filename, "r")) == NULL) 1595 else if ((fp = fopen(filename, "r")) == NULL)
1325 return 1; 1596 return 1;
1326 1597
1327 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1598 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1328 if ((p = strchr(path, '\n')) != NULL) 1599 if ((p = strchr(path, '\n')) != NULL)
1329 *p = 0; 1600 *p = 0;
1330 search_path = path; 1601 search_path = path;
1331 scanelf_dir(path); 1602 ret = scanelf_dir(path);
1332 } 1603 }
1333 if (fp != stdin) 1604 if (fp != stdin)
1334 fclose(fp); 1605 fclose(fp);
1335 return 0; 1606 return ret;
1336} 1607}
1337 1608
1338#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__) 1609#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1339 1610
1340static int load_ld_cache_config(int i, const char *fname) 1611static int load_ld_cache_config(int i, const char *fname)
1341{ 1612{
1342 FILE *fp = NULL; 1613 FILE *fp = NULL;
1343 char *p; 1614 char *p;
1344 char path[__PAX_UTILS_PATH_MAX]; 1615 char path[__PAX_UTILS_PATH_MAX];
1616 char _fname[__PAX_UTILS_PATH_MAX];
1345 1617
1346 if (i + 1 == ARRAY_SIZE(ldpaths)) 1618 fname = maybe_add_root(fname, _fname);
1347 return i;
1348 1619
1349 if ((fp = fopen(fname, "r")) == NULL) 1620 if ((fp = fopen(fname, "r")) == NULL)
1350 return i; 1621 return i;
1351 1622
1352 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1623 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1353 if ((p = strrchr(path, '\r')) != NULL) 1624 if ((p = strrchr(path, '\r')) != NULL)
1354 *p = 0; 1625 *p = 0;
1355 if ((p = strchr(path, '\n')) != NULL) 1626 if ((p = strchr(path, '\n')) != NULL)
1356 *p = 0; 1627 *p = 0;
1357#ifdef __linux__ 1628
1358 // recursive includes of the same file will make this segfault. 1629 /* recursive includes of the same file will make this segfault. */
1359 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) { 1630 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1360 glob64_t gl; 1631 glob_t gl;
1361 size_t x; 1632 size_t x;
1362 char gpath[__PAX_UTILS_PATH_MAX]; 1633 char gpath[__PAX_UTILS_PATH_MAX];
1363 1634
1364 memset(gpath, 0, sizeof(gpath)); 1635 memset(gpath, 0, sizeof(gpath));
1636 if (root)
1637 strcpy(gpath, root);
1365 1638
1366 if (path[8] != '/') 1639 if (path[8] != '/')
1367 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]); 1640 snprintf(gpath+strlen(gpath), sizeof(gpath)-strlen(gpath), "/etc/%s", &path[8]);
1368 else 1641 else
1369 strncpy(gpath, &path[8], sizeof(gpath)); 1642 strncpy(gpath+strlen(gpath), &path[8], sizeof(gpath)-strlen(gpath));
1370 1643
1371 if ((glob64(gpath, 0, NULL, &gl)) == 0) { 1644 if (glob(gpath, 0, NULL, &gl) == 0) {
1372 for (x = 0; x < gl.gl_pathc; ++x) { 1645 for (x = 0; x < gl.gl_pathc; ++x) {
1373 /* try to avoid direct loops */ 1646 /* try to avoid direct loops */
1374 if (strcmp(gl.gl_pathv[x], fname) == 0) 1647 if (strcmp(gl.gl_pathv[x], fname) == 0)
1375 continue; 1648 continue;
1376 i = load_ld_cache_config(i, gl.gl_pathv[x]); 1649 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1377 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1378 globfree64(&gl);
1379 return i;
1380 }
1381 } 1650 }
1382 globfree64 (&gl); 1651 globfree(&gl);
1383 continue; 1652 continue;
1384 } else
1385 abort();
1386 } 1653 }
1387#endif 1654 }
1655
1388 if (*path != '/') 1656 if (*path != '/')
1389 continue; 1657 continue;
1390 1658
1391 ldpaths[i++] = xstrdup(path); 1659 xarraypush(ldpaths, path, strlen(path));
1392
1393 if (i + 1 == ARRAY_SIZE(ldpaths))
1394 break;
1395 } 1660 }
1396 ldpaths[i] = NULL;
1397 1661
1398 fclose(fp); 1662 fclose(fp);
1399 return i; 1663 return i;
1400} 1664}
1401 1665
1402#elif defined(__FreeBSD__) || (__DragonFly__) 1666#elif defined(__FreeBSD__) || defined(__DragonFly__)
1403 1667
1404static int load_ld_cache_config(int i, const char *fname) 1668static int load_ld_cache_config(int i, const char *fname)
1405{ 1669{
1406 FILE *fp = NULL; 1670 FILE *fp = NULL;
1407 char *b = NULL, *p; 1671 char *b = NULL, *p;
1408 struct elfhints_hdr hdr; 1672 struct elfhints_hdr hdr;
1673 char _fname[__PAX_UTILS_PATH_MAX];
1409 1674
1410 if (i + 1 == ARRAY_SIZE(ldpaths)) 1675 fname = maybe_add_root(fname, _fname);
1411 return i;
1412 1676
1413 if ((fp = fopen(fname, "r")) == NULL) 1677 if ((fp = fopen(fname, "r")) == NULL)
1414 return i; 1678 return i;
1415 1679
1416 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) || 1680 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1419 { 1683 {
1420 fclose(fp); 1684 fclose(fp);
1421 return i; 1685 return i;
1422 } 1686 }
1423 1687
1424 b = (char*)malloc(hdr.dirlistlen+1); 1688 b = xmalloc(hdr.dirlistlen + 1);
1425 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) { 1689 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1426 fclose(fp); 1690 fclose(fp);
1427 free(b); 1691 free(b);
1428 return i; 1692 return i;
1429 } 1693 }
1430 1694
1431 while ((p = strsep(&b, ":"))) { 1695 while ((p = strsep(&b, ":"))) {
1432 if (*p == '\0') continue; 1696 if (*p == '\0')
1433 ldpaths[i++] = xstrdup(p); 1697 continue;
1434 1698 xarraypush(ldpaths, p, strlen(p));
1435 if (i + 1 == ARRAY_SIZE(ldpaths))
1436 break;
1437 } 1699 }
1438 ldpaths[i] = NULL;
1439 1700
1440 free(b); 1701 free(b);
1441 fclose(fp); 1702 fclose(fp);
1442 return i; 1703 return i;
1443} 1704}
1444 1705
1445#else 1706#else
1446 1707#ifdef __ELF__
1447#warning Cache config support not implemented for your target 1708#warning Cache config support not implemented for your target
1709#endif
1448static int load_ld_cache_config(int i, const char *fname) 1710static int load_ld_cache_config(int i, const char *fname)
1449{ 1711{
1450 memset(ldpaths, 0x00, sizeof(ldpaths)); 1712 return 0;
1451} 1713}
1452
1453#endif 1714#endif
1454 1715
1455/* scan /etc/ld.so.conf for paths */ 1716/* scan /etc/ld.so.conf for paths */
1456static void scanelf_ldpath() 1717static void scanelf_ldpath(void)
1457{ 1718{
1458 char scan_l, scan_ul, scan_ull; 1719 char scan_l, scan_ul, scan_ull;
1720 size_t n;
1721 const char *ldpath;
1459 int i = 0; 1722 int i = 0;
1460 1723
1461 if (!ldpaths[0]) 1724 if (array_cnt(ldpaths) == 0)
1462 err("Unable to load any paths from ld.so.conf"); 1725 err("Unable to load any paths from ld.so.conf");
1463 1726
1464 scan_l = scan_ul = scan_ull = 0; 1727 scan_l = scan_ul = scan_ull = 0;
1465 1728
1466 while (ldpaths[i]) { 1729 array_for_each(ldpaths, n, ldpath) {
1467 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1; 1730 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = 1;
1468 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1; 1731 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = 1;
1469 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1; 1732 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = 1;
1470 scanelf_dir(ldpaths[i]); 1733 scanelf_dir(ldpath);
1471 ++i; 1734 ++i;
1472 } 1735 }
1473 1736
1474 if (!scan_l) scanelf_dir("/lib"); 1737 if (!scan_l) scanelf_dir("/lib");
1475 if (!scan_ul) scanelf_dir("/usr/lib"); 1738 if (!scan_ul) scanelf_dir("/usr/lib");
1476 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1739 if (!scan_ull) scanelf_dir("/usr/local/lib");
1477} 1740}
1478 1741
1479/* scan env PATH for paths */ 1742/* scan env PATH for paths */
1480static void scanelf_envpath() 1743static void scanelf_envpath(void)
1481{ 1744{
1482 char *path, *p; 1745 char *path, *p;
1483 1746
1484 path = getenv("PATH"); 1747 path = getenv("PATH");
1485 if (!path) 1748 if (!path)
1492 } 1755 }
1493 1756
1494 free(path); 1757 free(path);
1495} 1758}
1496 1759
1497/* usage / invocation handling functions */ 1760/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1498#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV" 1761#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1499#define a_argument required_argument 1762#define a_argument required_argument
1500static struct option const long_opts[] = { 1763static struct option const long_opts[] = {
1501 {"path", no_argument, NULL, 'p'}, 1764 {"path", no_argument, NULL, 'p'},
1502 {"ldpath", no_argument, NULL, 'l'}, 1765 {"ldpath", no_argument, NULL, 'l'},
1766 {"root", a_argument, NULL, 128},
1503 {"recursive", no_argument, NULL, 'R'}, 1767 {"recursive", no_argument, NULL, 'R'},
1504 {"mount", no_argument, NULL, 'm'}, 1768 {"mount", no_argument, NULL, 'm'},
1505 {"symlink", no_argument, NULL, 'y'}, 1769 {"symlink", no_argument, NULL, 'y'},
1506 {"archives", no_argument, NULL, 'A'}, 1770 {"archives", no_argument, NULL, 'A'},
1507 {"ldcache", no_argument, NULL, 'L'}, 1771 {"ldcache", no_argument, NULL, 'L'},
1520 {"lib", a_argument, NULL, 'N'}, 1784 {"lib", a_argument, NULL, 'N'},
1521 {"gmatch", no_argument, NULL, 'g'}, 1785 {"gmatch", no_argument, NULL, 'g'},
1522 {"textrels", no_argument, NULL, 'T'}, 1786 {"textrels", no_argument, NULL, 'T'},
1523 {"etype", a_argument, NULL, 'E'}, 1787 {"etype", a_argument, NULL, 'E'},
1524 {"bits", a_argument, NULL, 'M'}, 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'},
1525 {"all", no_argument, NULL, 'a'}, 1794 {"all", no_argument, NULL, 'a'},
1526 {"quiet", no_argument, NULL, 'q'}, 1795 {"quiet", no_argument, NULL, 'q'},
1527 {"verbose", no_argument, NULL, 'v'}, 1796 {"verbose", no_argument, NULL, 'v'},
1528 {"format", a_argument, NULL, 'F'}, 1797 {"format", a_argument, NULL, 'F'},
1529 {"from", a_argument, NULL, 'f'}, 1798 {"from", a_argument, NULL, 'f'},
1530 {"file", a_argument, NULL, 'o'}, 1799 {"file", a_argument, NULL, 'o'},
1800 {"nocolor", no_argument, NULL, 'C'},
1531 {"nobanner", no_argument, NULL, 'B'}, 1801 {"nobanner", no_argument, NULL, 'B'},
1532 {"help", no_argument, NULL, 'h'}, 1802 {"help", no_argument, NULL, 'h'},
1533 {"version", no_argument, NULL, 'V'}, 1803 {"version", no_argument, NULL, 'V'},
1534 {NULL, no_argument, NULL, 0x0} 1804 {NULL, no_argument, NULL, 0x0}
1535}; 1805};
1536 1806
1537static const char *opts_help[] = { 1807static const char * const opts_help[] = {
1538 "Scan all directories in PATH environment", 1808 "Scan all directories in PATH environment",
1539 "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)",
1540 "Scan directories recursively", 1811 "Scan directories recursively",
1541 "Don't recursively cross mount points", 1812 "Don't recursively cross mount points",
1542 "Don't scan symlinks", 1813 "Don't scan symlinks",
1543 "Scan archives (.a files)", 1814 "Scan archives (.a files)",
1544 "Utilize ld.so.cache information (use with -r/-n)", 1815 "Utilize ld.so.cache information (use with -r/-n)",
1553 "Print BIND information", 1824 "Print BIND information",
1554 "Print SONAME information", 1825 "Print SONAME information",
1555 "Find a specified symbol", 1826 "Find a specified symbol",
1556 "Find a specified section", 1827 "Find a specified section",
1557 "Find a specified library", 1828 "Find a specified library",
1558 "Use strncmp to match libraries. (use with -N)", 1829 "Use regex matching rather than string compare (use with -s)",
1559 "Locate cause of TEXTREL", 1830 "Locate cause of TEXTREL",
1560 "Print only ELF files matching etype ET_DYN,ET_EXEC ...", 1831 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1561 "Print only ELF files matching numeric bits", 1832 "Print only ELF files matching numeric bits",
1562 "Print all scanned info (-x -e -t -r -b)\n", 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",
1563 "Only output 'bad' things", 1839 "Only output 'bad' things",
1564 "Be verbose (can be specified more than once)", 1840 "Be verbose (can be specified more than once)",
1565 "Use specified format for output", 1841 "Use specified format for output",
1566 "Read input stream from a filename", 1842 "Read input stream from a filename",
1567 "Write output stream to a filename", 1843 "Write output stream to a filename",
1844 "Don't emit color in output",
1568 "Don't display the header", 1845 "Don't display the header",
1569 "Print this help and exit", 1846 "Print this help and exit",
1570 "Print version and exit", 1847 "Print version and exit",
1571 NULL 1848 NULL
1572}; 1849};
1580 printf("Options: -[%s]\n", PARSE_FLAGS); 1857 printf("Options: -[%s]\n", PARSE_FLAGS);
1581 for (i = 0; long_opts[i].name; ++i) 1858 for (i = 0; long_opts[i].name; ++i)
1582 if (long_opts[i].has_arg == no_argument) 1859 if (long_opts[i].has_arg == no_argument)
1583 printf(" -%c, --%-14s* %s\n", long_opts[i].val, 1860 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1584 long_opts[i].name, opts_help[i]); 1861 long_opts[i].name, opts_help[i]);
1862 else if (long_opts[i].val > '~')
1863 printf(" --%-7s <arg> * %s\n",
1864 long_opts[i].name, opts_help[i]);
1585 else 1865 else
1586 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val, 1866 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1587 long_opts[i].name, opts_help[i]); 1867 long_opts[i].name, opts_help[i]);
1588 1868
1589 if (status != EXIT_SUCCESS) 1869 puts("\nFor more information, see the scanelf(1) manpage");
1590 exit(status);
1591
1592 puts("\nThe format modifiers for the -F option are:");
1593 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1594 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1595 puts(" i INTERP \tb BIND \ts symbol");
1596 puts(" N library \to Type \tT TEXTRELs");
1597 puts(" S SONAME \tk section");
1598 puts(" p filename (with search path removed)");
1599 puts(" f filename (short name/basename)");
1600 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1601
1602 puts("\nELF Etypes:");
1603 print_etypes(stdout);
1604
1605 exit(status); 1870 exit(status);
1606} 1871}
1607 1872
1608/* 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 }
1609static void parseargs(int argc, char *argv[]) 1882static int parseargs(int argc, char *argv[])
1610{ 1883{
1611 int i; 1884 int i;
1612 const char *from_file = NULL; 1885 const char *from_file = NULL;
1886 int ret = 0;
1613 1887
1614 opterr = 0; 1888 opterr = 0;
1615 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) {
1616 switch (i) { 1890 switch (i) {
1617 1891
1625 case 'f': 1899 case 'f':
1626 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");
1627 from_file = optarg; 1901 from_file = optarg;
1628 break; 1902 break;
1629 case 'E': 1903 case 'E':
1630 strncpy(match_etypes, optarg, sizeof(match_etypes)); 1904 match_etypes = optarg;
1631 break; 1905 break;
1632 case 'M': 1906 case 'M':
1633 match_bits = atoi(optarg); 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;
1634 break; 1918 break;
1635 case 'o': { 1919 case 'o': {
1636 if (freopen(optarg, "w", stdout) == NULL) 1920 if (freopen(optarg, "w", stdout) == NULL)
1637 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1921 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1638 break; 1922 break;
1639 } 1923 }
1640 case 'k': 1924 case 'k':
1641 if (find_section) warn("You prob don't want to specify -k twice"); 1925 xarraypush(find_section_arr, optarg, strlen(optarg));
1642 find_section = optarg;
1643 break; 1926 break;
1644 case 's': { 1927 case 's': {
1645 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");
1646 find_sym = optarg; 1929 find_sym = optarg;
1647 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1648 sprintf(versioned_symname, "%s@", find_sym);
1649 break; 1930 break;
1650 } 1931 }
1651 case 'N': { 1932 case 'N':
1652 if (find_lib) warn("You prob don't want to specify -N twice"); 1933 xarraypush(find_lib_arr, optarg, strlen(optarg));
1653 find_lib = optarg;
1654 break; 1934 break;
1655 }
1656
1657 case 'F': { 1935 case 'F': {
1658 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");
1659 out_format = optarg; 1937 out_format = optarg;
1660 break; 1938 break;
1661 } 1939 }
1662 case 'z': { 1940 case 'z': {
1663 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC); 1941 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1664 size_t x; 1942 size_t x;
1665 1943
1666 for (x = 0 ; x < strlen(optarg); x++) { 1944 for (x = 0; x < strlen(optarg); x++) {
1667 switch(optarg[x]) { 1945 switch (optarg[x]) {
1668 case 'p': 1946 case 'p':
1669 case 'P': 1947 case 'P':
1670 do_state(optarg[x], PAGEEXEC); 1948 do_pax_state(optarg[x], PAGEEXEC);
1671 break; 1949 break;
1672 case 's': 1950 case 's':
1673 case 'S': 1951 case 'S':
1674 do_state(optarg[x], SEGMEXEC); 1952 do_pax_state(optarg[x], SEGMEXEC);
1675 break; 1953 break;
1676 case 'm': 1954 case 'm':
1677 case 'M': 1955 case 'M':
1678 do_state(optarg[x], MPROTECT); 1956 do_pax_state(optarg[x], MPROTECT);
1679 break; 1957 break;
1680 case 'e': 1958 case 'e':
1681 case 'E': 1959 case 'E':
1682 do_state(optarg[x], EMUTRAMP); 1960 do_pax_state(optarg[x], EMUTRAMP);
1683 break; 1961 break;
1684 case 'r': 1962 case 'r':
1685 case 'R': 1963 case 'R':
1686 do_state(optarg[x], RANDMMAP); 1964 do_pax_state(optarg[x], RANDMMAP);
1687 break; 1965 break;
1688 case 'x': 1966 case 'x':
1689 case 'X': 1967 case 'X':
1690 do_state(optarg[x], RANDEXEC); 1968 do_pax_state(optarg[x], RANDEXEC);
1691 break; 1969 break;
1692 default: 1970 default:
1693 break; 1971 break;
1694 } 1972 }
1695 } 1973 }
1700 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) || 1978 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1701 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)))) 1979 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1702 setpax = flags; 1980 setpax = flags;
1703 break; 1981 break;
1704 } 1982 }
1983 case 'Z': show_size = 1; break;
1705 case 'g': gmatch = 1; break; 1984 case 'g': g_match = 1; break;
1706 case 'L': use_ldcache = 1; break; 1985 case 'L': use_ldcache = 1; break;
1707 case 'y': scan_symlink = 0; break; 1986 case 'y': scan_symlink = 0; break;
1708 case 'A': scan_archives = 1; break; 1987 case 'A': scan_archives = 1; break;
1988 case 'C': color_init(true); break;
1709 case 'B': show_banner = 0; break; 1989 case 'B': show_banner = 0; break;
1710 case 'l': scan_ldpath = 1; break; 1990 case 'l': scan_ldpath = 1; break;
1711 case 'p': scan_envpath = 1; break; 1991 case 'p': scan_envpath = 1; break;
1712 case 'R': dir_recurse = 1; break; 1992 case 'R': dir_recurse = 1; break;
1713 case 'm': dir_crossmount = 0; break; 1993 case 'm': dir_crossmount = 0; break;
1721 case 'b': show_bind = 1; break; 2001 case 'b': show_bind = 1; break;
1722 case 'S': show_soname = 1; break; 2002 case 'S': show_soname = 1; break;
1723 case 'T': show_textrels = 1; break; 2003 case 'T': show_textrels = 1; break;
1724 case 'q': be_quiet = 1; break; 2004 case 'q': be_quiet = 1; break;
1725 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2005 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1726 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;
1727 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;
1728 case ':': 2013 case ':':
1729 err("Option '%c' is missing parameter", optopt); 2014 err("Option '%c' is missing parameter", optopt);
1730 case '?': 2015 case '?':
1731 err("Unknown option '%c' or argument missing", optopt); 2016 err("Unknown option '%c' or argument missing", optopt);
1732 default: 2017 default:
1733 err("Unhandled option '%c'; please report this", i); 2018 err("Unhandled option '%c'; please report this", i);
1734 } 2019 }
1735 } 2020 }
1736 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);
1737 /* let the format option override all other options */ 2030 /* let the format option override all other options */
1738 if (out_format) { 2031 if (out_format) {
1739 show_pax = show_phdr = show_textrel = show_rpath = \ 2032 show_pax = show_phdr = show_textrel = show_rpath = \
1740 show_needed = show_interp = show_bind = show_soname = \ 2033 show_needed = show_interp = show_bind = show_soname = \
1741 show_textrels = 0; 2034 show_textrels = show_perms = show_endian = show_size = \
2035 show_osabi = show_eabi = 0;
1742 for (i = 0; out_format[i]; ++i) { 2036 for (i = 0; out_format[i]; ++i) {
1743 if (!IS_MODIFIER(out_format[i])) continue; 2037 if (!IS_MODIFIER(out_format[i])) continue;
1744 2038
1745 switch (out_format[++i]) { 2039 switch (out_format[++i]) {
1746 case '+': break; 2040 case '+': break;
1751 case 'f': break; 2045 case 'f': break;
1752 case 'k': break; 2046 case 'k': break;
1753 case 's': break; 2047 case 's': break;
1754 case 'N': break; 2048 case 'N': break;
1755 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;
1756 case 'x': show_pax = 1; break; 2057 case 'x': show_pax = 1; break;
1757 case 'e': show_phdr = 1; break; 2058 case 'e': show_phdr = 1; break;
1758 case 't': show_textrel = 1; break; 2059 case 't': show_textrel = 1; break;
1759 case 'r': show_rpath = 1; break; 2060 case 'r': show_rpath = 1; break;
1760 case 'n': show_needed = 1; break; 2061 case 'n': show_needed = 1; break;
1761 case 'i': show_interp = 1; break; 2062 case 'i': show_interp = 1; break;
1762 case 'b': show_bind = 1; break; 2063 case 'b': show_bind = 1; break;
1763 case 'S': show_soname = 1; break; 2064 case 'S': show_soname = 1; break;
1764 case 'T': show_textrels = 1; break; 2065 case 'T': show_textrels = 1; break;
1765 default: 2066 default:
1766 err("Invalid format specifier '%c' (byte %i)", 2067 err("Invalid format specifier '%c' (byte %i)",
1767 out_format[i], i+1); 2068 out_format[i], i+1);
1768 } 2069 }
1769 } 2070 }
1770 2071
1771 /* construct our default format */ 2072 /* construct our default format */
1772 } else { 2073 } else {
1773 size_t fmt_len = 30; 2074 size_t fmt_len = 30;
1774 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2075 out_format = xmalloc(sizeof(char) * fmt_len);
2076 *out_format = '\0';
1775 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2077 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1776 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);
1777 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2084 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1778 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2085 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1779 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2086 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1780 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2087 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1781 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2088 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1802 } 2109 }
1803 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2110 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1804 err("Nothing to scan !?"); 2111 err("Nothing to scan !?");
1805 while (optind < argc) { 2112 while (optind < argc) {
1806 search_path = argv[optind++]; 2113 search_path = argv[optind++];
1807 scanelf_dir(search_path); 2114 ret = scanelf_dir(search_path);
1808 } 2115 }
1809 2116
1810 /* clean up */ 2117 /* clean up */
1811 free(versioned_symname);
1812 for (i = 0; ldpaths[i]; ++i)
1813 free(ldpaths[i]); 2118 xarrayfree(ldpaths);
2119 xarrayfree(find_lib_arr);
2120 xarrayfree(find_section_arr);
2121 free(find_lib);
2122 free(find_section);
1814 2123
1815 if (ldcache != 0) 2124 if (ldcache != 0)
1816 munmap(ldcache, ldcache_size); 2125 munmap(ldcache, ldcache_size);
2126 return ret;
1817} 2127}
1818 2128
1819static char **get_split_env(const char *envvar) 2129static char **get_split_env(const char *envvar)
1820{ 2130{
1821 const char *delims = " \t\n"; 2131 const char *delims = " \t\n";
1847 2157
1848 /* don't want to free(env) as it contains the memory that backs 2158 /* don't want to free(env) as it contains the memory that backs
1849 * the envvals array of strings */ 2159 * the envvals array of strings */
1850 return envvals; 2160 return envvals;
1851} 2161}
2162
1852static void parseenv() 2163static void parseenv(void)
1853{ 2164{
2165 color_init(false);
1854 qa_textrels = get_split_env("QA_TEXTRELS"); 2166 qa_textrels = get_split_env("QA_TEXTRELS");
1855 qa_execstack = get_split_env("QA_EXECSTACK"); 2167 qa_execstack = get_split_env("QA_EXECSTACK");
1856 qa_wx_load = get_split_env("QA_WX_LOAD"); 2168 qa_wx_load = get_split_env("QA_WX_LOAD");
1857} 2169}
2170
1858#ifdef __PAX_UTILS_CLEANUP 2171#ifdef __PAX_UTILS_CLEANUP
1859static void cleanup() 2172static void cleanup(void)
1860{ 2173{
1861 free(out_format); 2174 free(out_format);
1862 free(qa_textrels); 2175 free(qa_textrels);
1863 free(qa_execstack); 2176 free(qa_execstack);
1864 free(qa_wx_load); 2177 free(qa_wx_load);
1865} 2178}
1866#endif 2179#endif
1867 2180
1868
1869
1870int main(int argc, char *argv[]) 2181int main(int argc, char *argv[])
1871{ 2182{
2183 int ret;
1872 if (argc < 2) 2184 if (argc < 2)
1873 usage(EXIT_FAILURE); 2185 usage(EXIT_FAILURE);
1874 parseenv(); 2186 parseenv();
1875 parseargs(argc, argv); 2187 ret = parseargs(argc, argv);
1876 fclose(stdout); 2188 fclose(stdout);
1877#ifdef __PAX_UTILS_CLEANUP 2189#ifdef __PAX_UTILS_CLEANUP
1878 cleanup(); 2190 cleanup();
1879 warn("The calls to add/delete heap should be off:\n" 2191 warn("The calls to add/delete heap should be off:\n"
1880 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n" 2192 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1881 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD"); 2193 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1882#endif 2194#endif
1883 return EXIT_SUCCESS;
1884}
1885
1886
1887
1888/* utility funcs */
1889static char *xstrdup(const char *s)
1890{
1891 char *ret = strdup(s);
1892 if (!ret) err("Could not strdup(): %s", strerror(errno));
1893 return ret; 2195 return ret;
1894}
1895static void *xmalloc(size_t size)
1896{
1897 void *ret = malloc(size);
1898 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1899 return ret;
1900}
1901static void *xrealloc(void *ptr, size_t size)
1902{
1903 void *ret = realloc(ptr, size);
1904 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
1905 return ret;
1906}
1907static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1908{
1909 size_t new_len;
1910
1911 new_len = strlen(*dst) + strlen(src);
1912 if (*curr_len <= new_len) {
1913 *curr_len = new_len + (*curr_len / 2);
1914 *dst = realloc(*dst, *curr_len);
1915 if (!*dst)
1916 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1917 }
1918
1919 if (n)
1920 strncat(*dst, src, n);
1921 else
1922 strcat(*dst, src);
1923}
1924static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1925{
1926 static char my_app[2];
1927 my_app[0] = append;
1928 my_app[1] = '\0';
1929 xstrcat(dst, my_app, curr_len);
1930} 2196}
1931 2197
1932/* Match filename against entries in matchlist, return TRUE 2198/* Match filename against entries in matchlist, return TRUE
1933 * if the file is listed */ 2199 * if the file is listed */
1934static int file_matches_list(const char *filename, char **matchlist) 2200static int file_matches_list(const char *filename, char **matchlist)

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