/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.156 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 1.156 2006/06/11 00:23:11 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 1.156 2006/06/11 00:23:11 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); \
266 break; \ 298 break; \
267 } \ 299 } \
268 } \ 300 } \
269 skip_this_shdr##B: \ 301 skip_this_shdr##B: \
270 if (!multi_stack) { \ 302 if (!multi_stack) { \
303 if (file_matches_list(elf->filename, qa_execstack)) \
304 return NULL; \
271 *found_phdr = 1; \ 305 *found_phdr = 1; \
272 shown = 1; \ 306 shown = 1; \
273 memcpy(ret, "!WX", 3); \ 307 memcpy(ret, "!WX", 3); \
274 } \ 308 } \
275 } \ 309 } \
281 return NULL; 315 return NULL;
282 else 316 else
283 return ret; 317 return ret;
284} 318}
285 319
320/*
321 * See if this ELF contains a DT_TEXTREL tag in any of its
322 * PT_DYNAMIC sections.
323 */
286static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 324static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
287{ 325{
288 static const char *ret = "TEXTREL"; 326 static const char *ret = "TEXTREL";
289 unsigned long i; 327 unsigned long i;
290 328
298 Elf ## B ## _Dyn *dyn; \ 336 Elf ## B ## _Dyn *dyn; \
299 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 337 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
300 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 338 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
301 Elf ## B ## _Off offset; \ 339 Elf ## B ## _Off offset; \
302 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 340 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
303 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; \
304 offset = EGET(phdr[i].p_offset); \ 342 offset = EGET(phdr[i].p_offset); \
305 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 343 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
306 dyn = DYN ## B (elf->data + offset); \ 344 dyn = DYN ## B (elf->vdata + offset); \
307 while (EGET(dyn->d_tag) != DT_NULL) { \ 345 while (EGET(dyn->d_tag) != DT_NULL) { \
308 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)*/ \
309 *found_textrel = 1; \ 347 *found_textrel = 1; \
310 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 348 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
311 return (be_wewy_wewy_quiet ? NULL : ret); \ 349 return (be_wewy_wewy_quiet ? NULL : ret); \
320 if (be_quiet || be_wewy_wewy_quiet) 358 if (be_quiet || be_wewy_wewy_quiet)
321 return NULL; 359 return NULL;
322 else 360 else
323 return " - "; 361 return " - ";
324} 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 */
325static 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)
326{ 370{
327 unsigned long s, r, rmax; 371 unsigned long s, r, rmax;
328 void *symtab_void, *strtab_void, *text_void; 372 void *symtab_void, *strtab_void, *text_void;
329 373
350 Elf ## B ## _Rela *rela; \ 394 Elf ## B ## _Rela *rela; \
351 /* search the section headers for relocations */ \ 395 /* search the section headers for relocations */ \
352 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 396 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
353 uint32_t sh_type = EGET(shdr[s].sh_type); \ 397 uint32_t sh_type = EGET(shdr[s].sh_type); \
354 if (sh_type == SHT_REL) { \ 398 if (sh_type == SHT_REL) { \
355 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 399 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
356 rela = NULL; \ 400 rela = NULL; \
357 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 401 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
358 } else if (sh_type == SHT_RELA) { \ 402 } else if (sh_type == SHT_RELA) { \
359 rel = NULL; \ 403 rel = NULL; \
360 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 404 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
361 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 405 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
362 } else \ 406 } else \
363 continue; \ 407 continue; \
364 /* now see if any of the relocs are in the .text */ \ 408 /* now see if any of the relocs are in the .text */ \
365 for (r = 0; r < rmax; ++r) { \ 409 for (r = 0; r < rmax; ++r) { \
380 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 424 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
381 if (be_verbose <= 2) continue; \ 425 if (be_verbose <= 2) continue; \
382 } else \ 426 } else \
383 *found_textrels = 1; \ 427 *found_textrels = 1; \
384 /* locate this relocation symbol name */ \ 428 /* locate this relocation symbol name */ \
385 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 429 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
386 if ((void*)sym > (void*)elf->data_end) { \ 430 if ((void*)sym > elf->data_end) { \
387 warn("%s: corrupt ELF symbol", elf->filename); \ 431 warn("%s: corrupt ELF symbol", elf->filename); \
388 continue; \ 432 continue; \
389 } \ 433 } \
390 sym_max = ELF ## B ## _R_SYM(r_info); \ 434 sym_max = ELF ## B ## _R_SYM(r_info); \
391 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 435 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
394 sym = NULL; \ 438 sym = NULL; \
395 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 439 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
396 /* show the raw details about this reloc */ \ 440 /* show the raw details about this reloc */ \
397 printf(" %s: ", elf->base_filename); \ 441 printf(" %s: ", elf->base_filename); \
398 if (sym && sym->st_name) \ 442 if (sym && sym->st_name) \
399 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)); \
400 else \ 444 else \
401 printf("(memory/fake?)"); \ 445 printf("(memory/data?)"); \
402 printf(" [0x%lX]", (unsigned long)r_offset); \ 446 printf(" [0x%lX]", (unsigned long)r_offset); \
403 /* 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 */ \
404 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 448 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
405 func = NULL; \ 449 func = NULL; \
406 offset_tmp = 0; \ 450 offset_tmp = 0; \
407 while (sym_max--) { \ 451 while (sym_max--) { \
408 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) { \
409 func = sym; \ 453 func = sym; \
410 offset_tmp = EGET(sym->st_value); \ 454 offset_tmp = EGET(sym->st_value); \
411 } \ 455 } \
412 ++sym; \ 456 ++sym; \
413 } \ 457 } \
414 printf(" in "); \ 458 printf(" in "); \
415 if (func && func->st_name) \ 459 if (func && func->st_name) { \
416 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); \
417 else \ 463 else \
418 printf("(NULL: fake?)"); \ 464 printf("%s", func_name); \
465 } else \
466 printf("(optimized out)"); \
419 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 } \
420 } \ 489 } \
421 } } 490 } }
422 SHOW_TEXTRELS(32) 491 SHOW_TEXTRELS(32)
423 SHOW_TEXTRELS(64) 492 SHOW_TEXTRELS(64)
424 } 493 }
426 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);
427 496
428 return NULL; 497 return NULL;
429} 498}
430 499
431static void rpath_security_checks(elfobj *, char *, const char *);
432static 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)
433{ 501{
434 struct stat st; 502 struct stat st;
435 switch (*item) { 503 switch (*item) {
436 case '/': break; 504 case '/': break;
442 warnf("Security problem NULL %s in %s", dt_type, elf->filename); 510 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
443 break; 511 break;
444 case '$': 512 case '$':
445 if (fstat(elf->fd, &st) != -1) 513 if (fstat(elf->fd, &st) != -1)
446 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 514 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
447 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",
448 dt_type, item, elf->filename, st.st_mode & 07777); 516 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
449 break; 517 break;
450 default: 518 default:
451 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);
452 break; 520 break;
453 } 521 }
454} 522}
455static 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)
456{ 524{
457 unsigned long i, s; 525 unsigned long i;
458 char *rpath, *runpath, **r; 526 char *rpath, *runpath, **r;
459 void *strtbl_void; 527 void *strtbl_void;
460 528
461 if (!show_rpath) return; 529 if (!show_rpath) return;
462 530
473 Elf ## B ## _Off offset; \ 541 Elf ## B ## _Off offset; \
474 Elf ## B ## _Xword word; \ 542 Elf ## B ## _Xword word; \
475 /* Scan all the program headers */ \ 543 /* Scan all the program headers */ \
476 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 544 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
477 /* Just scan dynamic headers */ \ 545 /* Just scan dynamic headers */ \
478 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; \
479 offset = EGET(phdr[i].p_offset); \ 547 offset = EGET(phdr[i].p_offset); \
480 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 548 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
481 /* Just scan dynamic RPATH/RUNPATH headers */ \ 549 /* Just scan dynamic RPATH/RUNPATH headers */ \
482 dyn = DYN ## B (elf->data + offset); \ 550 dyn = DYN ## B (elf->vdata + offset); \
483 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 551 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
484 if (word == DT_RPATH) { \ 552 if (word == DT_RPATH) { \
485 r = &rpath; \ 553 r = &rpath; \
486 } else if (word == DT_RUNPATH) { \ 554 } else if (word == DT_RUNPATH) { \
487 r = &runpath; \ 555 r = &runpath; \
491 } \ 559 } \
492 /* Verify the memory is somewhat sane */ \ 560 /* Verify the memory is somewhat sane */ \
493 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 561 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
494 if (offset < (Elf ## B ## _Off)elf->len) { \ 562 if (offset < (Elf ## B ## _Off)elf->len) { \
495 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 563 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
496 *r = (char*)(elf->data + offset); \ 564 *r = elf->data + offset; \
497 /* 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 */ \
498 if (fix_elf) \ 566 if (fix_elf) \
499 offset = strlen(*r); \ 567 offset = strlen(*r); \
500 /* If quiet, don't output paths in ld.so.conf */ \ 568 /* If quiet, don't output paths in ld.so.conf */ \
501 if (be_quiet) { \ 569 if (be_quiet) { \
507 /* scan each path in : delimited list */ \ 575 /* scan each path in : delimited list */ \
508 while (start) { \ 576 while (start) { \
509 rpath_security_checks(elf, start, get_elfdtype(word)); \ 577 rpath_security_checks(elf, start, get_elfdtype(word)); \
510 end = strchr(start, ':'); \ 578 end = strchr(start, ':'); \
511 len = (end ? abs(end - start) : strlen(start)); \ 579 len = (end ? abs(end - start) : strlen(start)); \
512 if (use_ldcache) \ 580 if (use_ldcache) { \
513 for (s = 0; ldpaths[s]; ++s) \ 581 size_t n; \
582 const char *ldpath; \
583 array_for_each(ldpaths, n, ldpath) \
514 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 584 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
515 *r = end; \ 585 *r = end; \
516 /* corner case ... if RPATH reads "/usr/lib:", we want \ 586 /* corner case ... if RPATH reads "/usr/lib:", we want \
517 * to show ':' rather than '' */ \ 587 * to show ':' rather than '' */ \
518 if (end && end[1] != '\0') \ 588 if (end && end[1] != '\0') \
519 (*r)++; \ 589 (*r)++; \
520 break; \ 590 break; \
521 } \ 591 } \
592 } \
522 if (!*r || !end) \ 593 if (!*r || !end) \
523 break; \ 594 break; \
524 else \ 595 else \
525 start = start + len + 1; \ 596 start = start + len + 1; \
526 } \ 597 } \
611#define FLAG_S390_LIB64 0x0400 682#define FLAG_S390_LIB64 0x0400
612#define FLAG_POWERPC_LIB64 0x0500 683#define FLAG_POWERPC_LIB64 0x0500
613#define FLAG_MIPS64_LIBN32 0x0600 684#define FLAG_MIPS64_LIBN32 0x0600
614#define FLAG_MIPS64_LIBN64 0x0700 685#define FLAG_MIPS64_LIBN64 0x0700
615 686
616static char *lookup_cache_lib(elfobj *, char *);
617
618#if defined(__GLIBC__) || defined(__UCLIBC__) 687#if defined(__GLIBC__) || defined(__UCLIBC__)
619 688
620static char *lookup_cache_lib(elfobj *elf, char *fname) 689static char *lookup_cache_lib(elfobj *elf, char *fname)
621{ 690{
622 int fd = 0; 691 int fd;
623 char *strs; 692 char *strs;
624 static char buf[__PAX_UTILS_PATH_MAX] = ""; 693 static char buf[__PAX_UTILS_PATH_MAX] = "";
625 const char *cachefile = "/etc/ld.so.cache"; 694 const char cachefile[] = "/etc/ld.so.cache";
626 struct stat st; 695 struct stat st;
627 696
628 typedef struct { 697 typedef struct {
629 char magic[LDSO_CACHE_MAGIC_LEN]; 698 char magic[LDSO_CACHE_MAGIC_LEN];
630 char version[LDSO_CACHE_VER_LEN]; 699 char version[LDSO_CACHE_VER_LEN];
640 libentry_t *libent; 709 libentry_t *libent;
641 710
642 if (fname == NULL) 711 if (fname == NULL)
643 return NULL; 712 return NULL;
644 713
645 if (ldcache == 0) { 714 if (ldcache == NULL) {
646 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)
647 return NULL; 720 return NULL;
648 721
649 /* 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 */
650 ldcache_size = st.st_size; 723 ldcache_size = st.st_size;
651 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0); 724 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
652
653 close(fd); 725 close(fd);
654 726
655 if (ldcache == (caddr_t)-1) { 727 if (ldcache == MAP_FAILED) {
656 ldcache = 0; 728 ldcache = NULL;
657 return NULL; 729 return NULL;
658 } 730 }
659 731
660 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;
661 return NULL; 737 return NULL;
662 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
663 return NULL;
664 } 738 }
739 } else
740 header = ldcache;
665 741
666 header = (header_t *) ldcache;
667 libent = (libentry_t *) (ldcache + sizeof(header_t)); 742 libent = ldcache + sizeof(header_t);
668 strs = (char *) &libent[header->nlibs]; 743 strs = (char *) &libent[header->nlibs];
669 744
670 for (fd = 0; fd < header->nlibs; fd++) { 745 for (fd = 0; fd < header->nlibs; ++fd) {
671 /* 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
672 * diff arches will not be cached together. and we ignore the 747 * diff arches will not be cached together, and we ignore the
673 * the different multilib mips cases. */ 748 * the different multilib mips cases.
749 */
674 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK)) 750 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
675 continue; 751 continue;
676 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK)) 752 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
677 continue; 753 continue;
678 754
679 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 755 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
680 continue; 756 continue;
757
758 /* Return first hit because that is how the ldso rolls */
681 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 759 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
760 break;
682 } 761 }
762
683 return buf; 763 return buf;
684} 764}
765
685#elif defined(__NetBSD__) 766#elif defined(__NetBSD__)
686static char *lookup_cache_lib(elfobj *elf, char *fname) 767static char *lookup_cache_lib(elfobj *elf, char *fname)
687{ 768{
688 static char buf[__PAX_UTILS_PATH_MAX] = ""; 769 static char buf[__PAX_UTILS_PATH_MAX] = "";
689 static struct stat st; 770 static struct stat st;
690 771 size_t n;
691 char **ldpath; 772 char *ldpath;
692 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) { 773
774 array_for_each(ldpath, n, ldpath) {
693 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))
694 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 */
695 777
696 if (stat(buf, &st) != 0) 778 if (stat(buf, &st) != 0)
697 continue; /* if the lib doesn't exist in *ldpath, look further */ 779 continue; /* if the lib doesn't exist in *ldpath, look further */
698 780
706 788
707 /* not found in any path */ 789 /* not found in any path */
708 return NULL; 790 return NULL;
709} 791}
710#else 792#else
793#ifdef __ELF__
711#warning Cache support not implemented for your target 794#warning Cache support not implemented for your target
795#endif
712static char *lookup_cache_lib(elfobj *elf, char *fname) 796static char *lookup_cache_lib(elfobj *elf, char *fname)
713{ 797{
714 return NULL; 798 return NULL;
715} 799}
716#endif 800#endif
720 unsigned long i; 804 unsigned long i;
721 char *needed; 805 char *needed;
722 void *strtbl_void; 806 void *strtbl_void;
723 char *p; 807 char *p;
724 808
809 /*
810 * -n -> op==0 -> print all
811 * -N -> op==1 -> print requested
812 */
725 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 813 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
814 return NULL;
726 815
727 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 816 strtbl_void = elf_findsecbyname(elf, ".dynstr");
728 817
729 if (elf->phdr && strtbl_void) { 818 if (elf->phdr && strtbl_void) {
730#define SHOW_NEEDED(B) \ 819#define SHOW_NEEDED(B) \
732 Elf ## B ## _Dyn *dyn; \ 821 Elf ## B ## _Dyn *dyn; \
733 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 822 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
734 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 823 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
735 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 824 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
736 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 */ \
737 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 828 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
738 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; \
739 offset = EGET(phdr[i].p_offset); \ 831 offset = EGET(phdr[i].p_offset); \
740 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 */ \
741 dyn = DYN ## B (elf->data + offset); \ 835 dyn = DYN ## B (elf->vdata + offset); \
742 while (EGET(dyn->d_tag) != DT_NULL) { \ 836 while (EGET(dyn->d_tag) != DT_NULL) { \
743 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 837 if (EGET(dyn->d_tag) == DT_NEEDED) { \
744 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 838 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
745 if (offset >= (Elf ## B ## _Off)elf->len) { \ 839 if (offset >= (Elf ## B ## _Off)elf->len) { \
746 ++dyn; \ 840 ++dyn; \
747 continue; \ 841 continue; \
748 } \ 842 } \
749 needed = (char*)(elf->data + offset); \ 843 needed = elf->data + offset; \
750 if (op == 0) { \ 844 if (op == 0) { \
845 /* -n -> print all entries */ \
751 if (!be_wewy_wewy_quiet) { \ 846 if (!be_wewy_wewy_quiet) { \
752 if (*found_needed) xchrcat(ret, ',', ret_len); \ 847 if (*found_needed) xchrcat(ret, ',', ret_len); \
753 if (use_ldcache) \ 848 if (use_ldcache) \
754 if ((p = lookup_cache_lib(elf, needed)) != NULL) \ 849 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
755 needed = p; \ 850 needed = p; \
756 xstrcat(ret, needed, ret_len); \ 851 xstrcat(ret, needed, ret_len); \
757 } \ 852 } \
758 *found_needed = 1; \ 853 *found_needed = 1; \
759 } else { \ 854 } else { \
760 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)) { \
761 *found_lib = 1; \ 864 *found_lib = 1; \
762 return (be_wewy_wewy_quiet ? NULL : needed); \ 865 return (be_wewy_wewy_quiet ? NULL : find_lib); \
763 } \ 866 } \
764 } \ 867 } \
765 } \ 868 } \
766 ++dyn; \ 869 ++dyn; \
767 } \ 870 } \
808 Elf ## B ## _Dyn *dyn; \ 911 Elf ## B ## _Dyn *dyn; \
809 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 912 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
810 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 913 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
811 Elf ## B ## _Off offset; \ 914 Elf ## B ## _Off offset; \
812 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 915 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
813 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; \
814 dynamic = 1; \ 917 dynamic = 1; \
815 offset = EGET(phdr[i].p_offset); \ 918 offset = EGET(phdr[i].p_offset); \
816 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 919 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
817 dyn = DYN ## B (elf->data + offset); \ 920 dyn = DYN ## B (elf->vdata + offset); \
818 while (EGET(dyn->d_tag) != DT_NULL) { \ 921 while (EGET(dyn->d_tag) != DT_NULL) { \
819 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 922 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
820 (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)) \
821 { \ 924 { \
822 if (be_quiet) return NULL; \ 925 if (be_quiet) return NULL; \
830 SHOW_BIND(32) 933 SHOW_BIND(32)
831 SHOW_BIND(64) 934 SHOW_BIND(64)
832 935
833 if (be_wewy_wewy_quiet) return NULL; 936 if (be_wewy_wewy_quiet) return NULL;
834 937
938 /* don't output anything if quiet mode and the ELF is static or not setuid */
835 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { 939 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
836 return NULL; 940 return NULL;
837 } else { 941 } else {
838 *found_bind = 1; 942 *found_bind = 1;
839 return (char *) (dynamic ? "LAZY" : "STATIC"); 943 return (char *)(dynamic ? "LAZY" : "STATIC");
840 } 944 }
841} 945}
842static char *scanelf_file_soname(elfobj *elf, char *found_soname) 946static char *scanelf_file_soname(elfobj *elf, char *found_soname)
843{ 947{
844 unsigned long i; 948 unsigned long i;
856 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 960 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
857 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 961 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
858 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 962 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
859 Elf ## B ## _Off offset; \ 963 Elf ## B ## _Off offset; \
860 /* only look for soname in shared objects */ \ 964 /* only look for soname in shared objects */ \
861 if (ehdr->e_type != ET_DYN) \ 965 if (EGET(ehdr->e_type) != ET_DYN) \
862 return NULL; \ 966 return NULL; \
863 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 967 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
864 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; \
865 offset = EGET(phdr[i].p_offset); \ 969 offset = EGET(phdr[i].p_offset); \
866 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 970 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
867 dyn = DYN ## B (elf->data + offset); \ 971 dyn = DYN ## B (elf->vdata + offset); \
868 while (EGET(dyn->d_tag) != DT_NULL) { \ 972 while (EGET(dyn->d_tag) != DT_NULL) { \
869 if (EGET(dyn->d_tag) == DT_SONAME) { \ 973 if (EGET(dyn->d_tag) == DT_SONAME) { \
870 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 974 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
871 if (offset >= (Elf ## B ## _Off)elf->len) { \ 975 if (offset >= (Elf ## B ## _Off)elf->len) { \
872 ++dyn; \ 976 ++dyn; \
873 continue; \ 977 continue; \
874 } \ 978 } \
875 soname = (char*)(elf->data + offset); \ 979 soname = elf->data + offset; \
876 *found_soname = 1; \ 980 *found_soname = 1; \
877 return (be_wewy_wewy_quiet ? NULL : soname); \ 981 return (be_wewy_wewy_quiet ? NULL : soname); \
878 } \ 982 } \
879 ++dyn; \ 983 ++dyn; \
880 } \ 984 } \
883 SHOW_SONAME(64) 987 SHOW_SONAME(64)
884 } 988 }
885 989
886 return NULL; 990 return NULL;
887} 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
888static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1160static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
889{ 1161{
890 unsigned long i; 1162 unsigned long i;
891 char *ret; 1163 char *ret;
892 void *symtab_void, *strtab_void; 1164 void *symtab_void, *strtab_void;
893 1165
894 if (!find_sym) return NULL; 1166 if (!find_sym) return NULL;
895 ret = find_sym; 1167 ret = NULL;
896 1168
897 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1169 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
898 1170
899 if (symtab_void && strtab_void) { 1171 if (symtab_void && strtab_void) {
900#define FIND_SYM(B) \ 1172#define FIND_SYM(B) \
901 if (elf->elf_class == ELFCLASS ## B) { \ 1173 if (elf->elf_class == ELFCLASS ## B) { \
902 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1174 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
903 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1175 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
904 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)); \
905 unsigned long cnt = EGET(symtab->sh_entsize); \ 1177 unsigned long cnt = EGET(symtab->sh_entsize); \
906 char *symname; \ 1178 char *symname; \
1179 size_t ret_len = 0; \
907 if (cnt) \ 1180 if (cnt) \
908 cnt = EGET(symtab->sh_size) / cnt; \ 1181 cnt = EGET(symtab->sh_size) / cnt; \
909 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 } \
910 if (sym->st_name) { \ 1187 if (sym->st_name) { \
911 /* make sure the symbol name is in acceptable memory range */ \ 1188 /* make sure the symbol name is in acceptable memory range */ \
912 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1189 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
913 if ((void*)symname > (void*)elf->data_end) { \ 1190 if ((void*)symname > elf->data_end) { \
914 warnf("%s: corrupt ELF symbols", elf->filename); \ 1191 warnf("%s: corrupt ELF symbols", elf->filename); \
915 ++sym; \ 1192 ++sym; \
916 continue; \ 1193 continue; \
917 } \ 1194 } \
918 /* debug display ... show all symbols and some extra info */ \ 1195 scanelf_match_symname(elf, found_sym, \
919 if (*ret == '*') { \ 1196 &ret, &ret_len, symname, \
920 printf("%s(%s) %5lX %15s %s\n", \ 1197 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
921 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1198 ELF##B##_ST_BIND(EGET(sym->st_info)), \
922 elf->base_filename, \ 1199 EGET(sym->st_shndx), \
923 (unsigned long)sym->st_size, \ 1200 /* st_size can be 64bit, but no one is really that big, so screw em */ \
924 get_elfstttype(sym->st_info), \ 1201 EGET(sym->st_size)); \
925 symname); \
926 *found_sym = 1; \
927 } else { \
928 /* allow the user to specify a comma delimited list of symbols to search for */ \
929 char *this_sym, *this_sym_ver, *next_sym; \
930 this_sym = ret; \
931 this_sym_ver = versioned_symname; \
932 do { \
933 next_sym = strchr(this_sym, ','); \
934 if (next_sym == NULL) \
935 next_sym = this_sym + strlen(this_sym); \
936 /* do we want a defined symbol ? */ \
937 if (*this_sym == '+') { \
938 if (sym->st_shndx == SHN_UNDEF) \
939 goto skip_this_sym##B; \
940 ++this_sym; \
941 ++this_sym_ver; \
942 /* do we want an undefined symbol ? */ \
943 } else if (*this_sym == '-') { \
944 if (sym->st_shndx != SHN_UNDEF) \
945 goto skip_this_sym##B; \
946 ++this_sym; \
947 ++this_sym_ver; \
948 } \
949 /* ok, lets compare the name now */ \
950 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
951 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
952 if (be_semi_verbose) { \
953 char buf[126]; \
954 snprintf(buf, sizeof(buf), "%lX %s %s", \
955 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
956 ret = buf; \
957 } else \
958 ret = this_sym; \
959 (*found_sym)++; \
960 goto break_out; \
961 } \
962 skip_this_sym##B: this_sym = next_sym + 1; \
963 } while (*next_sym != '\0'); \
964 } \
965 } \ 1202 } \
966 ++sym; \ 1203 ++sym; \
967 } } 1204 } }
968 FIND_SYM(32) 1205 FIND_SYM(32)
969 FIND_SYM(64) 1206 FIND_SYM(64)
975 if (*find_sym != '*' && *found_sym) 1212 if (*find_sym != '*' && *found_sym)
976 return ret; 1213 return ret;
977 if (be_quiet) 1214 if (be_quiet)
978 return NULL; 1215 return NULL;
979 else 1216 else
980 return (char *)" - "; 1217 return " - ";
981} 1218}
982 1219
983
984static char *scanelf_file_sections(elfobj *elf, char *found_section) 1220static const char *scanelf_file_sections(elfobj *elf, char *found_section)
985{ 1221{
986 if (!find_section) 1222 if (!find_section)
987 return NULL; 1223 return NULL;
988 1224
989#define FIND_SECTION(B) \ 1225#define FIND_SECTION(B) \
990 if (elf->elf_class == ELFCLASS ## B) { \ 1226 if (elf->elf_class == ELFCLASS ## B) { \
1227 size_t matched, n; \
991 int invert; \ 1228 int invert; \
1229 const char *section_name; \
992 Elf ## B ## _Shdr *section; \ 1230 Elf ## B ## _Shdr *section; \
1231 \
1232 matched = 0; \
1233 array_for_each(find_section_arr, n, section_name) { \
993 invert = (*find_section == '!' ? 1 : 0); \ 1234 invert = (*section_name == '!' ? 1 : 0); \
994 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \ 1235 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
995 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)) \
996 *found_section = 1; \ 1241 *found_section = 1; \
997 } 1242 }
998 FIND_SECTION(32) 1243 FIND_SECTION(32)
999 FIND_SECTION(64) 1244 FIND_SECTION(64)
1000 1245
1005 return find_section; 1250 return find_section;
1006 1251
1007 if (be_quiet) 1252 if (be_quiet)
1008 return NULL; 1253 return NULL;
1009 else 1254 else
1010 return (char *)" - "; 1255 return " - ";
1011} 1256}
1012 1257
1013/* scan an elf file and show all the fun stuff */ 1258/* scan an elf file and show all the fun stuff */
1014#define prints(str) write(fileno(stdout), str, strlen(str)) 1259#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1015static int scanelf_elfobj(elfobj *elf) 1260static int scanelf_elfobj(elfobj *elf)
1016{ 1261{
1017 unsigned long i; 1262 unsigned long i;
1018 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1263 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1019 found_rpath, found_needed, found_interp, found_bind, found_soname, 1264 found_rpath, found_needed, found_interp, found_bind, found_soname,
1020 found_sym, found_lib, found_file, found_textrels, found_section; 1265 found_sym, found_lib, found_file, found_textrels, found_section;
1021 static char *out_buffer = NULL; 1266 static char *out_buffer = NULL;
1022 static size_t out_len; 1267 static size_t out_len;
1023 1268
1024 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1269 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1033 printf("%s: scanning file\n", elf->filename); 1278 printf("%s: scanning file\n", elf->filename);
1034 1279
1035 /* init output buffer */ 1280 /* init output buffer */
1036 if (!out_buffer) { 1281 if (!out_buffer) {
1037 out_len = sizeof(char) * 80; 1282 out_len = sizeof(char) * 80;
1038 out_buffer = (char*)xmalloc(out_len); 1283 out_buffer = xmalloc(out_len);
1039 } 1284 }
1040 *out_buffer = '\0'; 1285 *out_buffer = '\0';
1041 1286
1042 /* show the header */ 1287 /* show the header */
1043 if (!be_quiet && show_banner) { 1288 if (!be_quiet && show_banner) {
1054 case 'o': prints(" TYPE "); break; 1299 case 'o': prints(" TYPE "); break;
1055 case 'x': prints(" PAX "); break; 1300 case 'x': prints(" PAX "); break;
1056 case 'e': prints("STK/REL/PTL "); break; 1301 case 'e': prints("STK/REL/PTL "); break;
1057 case 't': prints("TEXTREL "); break; 1302 case 't': prints("TEXTREL "); break;
1058 case 'r': prints("RPATH "); break; 1303 case 'r': prints("RPATH "); break;
1304 case 'M': prints("CLASS "); break;
1059 case 'n': prints("NEEDED "); break; 1305 case 'n': prints("NEEDED "); break;
1060 case 'i': prints("INTERP "); break; 1306 case 'i': prints("INTERP "); break;
1061 case 'b': prints("BIND "); break; 1307 case 'b': prints("BIND "); break;
1308 case 'Z': prints("SIZE "); break;
1062 case 'S': prints("SONAME "); break; 1309 case 'S': prints("SONAME "); break;
1063 case 's': prints("SYM "); break; 1310 case 's': prints("SYM "); break;
1064 case 'N': prints("LIB "); break; 1311 case 'N': prints("LIB "); break;
1065 case 'T': prints("TEXTRELS "); break; 1312 case 'T': prints("TEXTRELS "); break;
1066 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;
1067 default: warnf("'%c' has no title ?", out_format[i]); 1319 default: warnf("'%c' has no title ?", out_format[i]);
1068 } 1320 }
1069 } 1321 }
1070 if (!found_file) prints("FILE "); 1322 if (!found_file) prints("FILE ");
1071 prints("\n"); 1323 prints("\n");
1075 1327
1076 /* dump all the good stuff */ 1328 /* dump all the good stuff */
1077 for (i = 0; out_format[i]; ++i) { 1329 for (i = 0; out_format[i]; ++i) {
1078 const char *out; 1330 const char *out;
1079 const char *tmp; 1331 const char *tmp;
1080 1332 static char ubuf[sizeof(unsigned long)*2];
1081 if (!IS_MODIFIER(out_format[i])) { 1333 if (!IS_MODIFIER(out_format[i])) {
1082 xchrcat(&out_buffer, out_format[i], &out_len); 1334 xchrcat(&out_buffer, out_format[i], &out_len);
1083 continue; 1335 continue;
1084 } 1336 }
1085 1337
1121 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1373 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1122 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;
1123 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1375 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1124 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;
1125 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;
1126 case 'n': 1381 case 'n':
1127 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;
1128 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1383 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1129 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1384 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1130 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1385 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1131 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1386 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1132 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;;
1133 default: warnf("'%c' has no scan code?", out_format[i]); 1392 default: warnf("'%c' has no scan code?", out_format[i]);
1134 } 1393 }
1135 if (out) { 1394 if (out)
1136 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1137 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1138 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1139 else
1140 xstrcat(&out_buffer, out, &out_len); 1395 xstrcat(&out_buffer, out, &out_len);
1141 }
1142 } 1396 }
1143 1397
1144#define FOUND_SOMETHING() \ 1398#define FOUND_SOMETHING() \
1145 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1399 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1146 found_rpath || found_needed || found_interp || found_bind || \ 1400 found_rpath || found_needed || found_interp || found_bind || \
1178 if (elf->elf_class != ELFCLASS64) 1432 if (elf->elf_class != ELFCLASS64)
1179 goto label_done; 1433 goto label_done;
1180 break; 1434 break;
1181 default: break; 1435 default: break;
1182 } 1436 }
1183 if (strlen(match_etypes)) { 1437 if (match_etypes) {
1184 char sbuf[126]; 1438 char sbuf[126];
1185 strncpy(sbuf, match_etypes, sizeof(sbuf)); 1439 strncpy(sbuf, match_etypes, sizeof(sbuf));
1186 if (strchr(match_etypes, ',') != NULL) { 1440 if (strchr(match_etypes, ',') != NULL) {
1187 char *p; 1441 char *p;
1188 while((p = strrchr(sbuf, ',')) != NULL) { 1442 while ((p = strrchr(sbuf, ',')) != NULL) {
1189 *p = 0; 1443 *p = 0;
1190 if (etype_lookup(p+1) == get_etype(elf)) 1444 if (etype_lookup(p+1) == get_etype(elf))
1191 goto label_ret; 1445 goto label_ret;
1192 } 1446 }
1193 } 1447 }
1213 1467
1214 ar = ar_open_fd(filename, fd); 1468 ar = ar_open_fd(filename, fd);
1215 if (ar == NULL) 1469 if (ar == NULL)
1216 return 1; 1470 return 1;
1217 1471
1218 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);
1219 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");
1220 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);
1221 if (elf) { 1478 if (elf) {
1222 scanelf_elfobj(elf); 1479 scanelf_elfobj(elf);
1223 unreadelf(elf); 1480 unreadelf(elf);
1224 } 1481 }
1225 } 1482 }
1226 munmap(ar_buffer, len); 1483 munmap(ar_buffer, len);
1227 1484
1228 return 0; 1485 return 0;
1229} 1486}
1230/* 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 */
1231static void scanelf_file(const char *filename) 1488static int scanelf_file(const char *filename, const struct stat *st_cache)
1232{ 1489{
1490 const struct stat *st = st_cache;
1233 struct stat st; 1491 struct stat symlink_st;
1234 int fd; 1492 int fd;
1235 1493
1236 /* make sure 'filename' exists */
1237 if (lstat(filename, &st) == -1) {
1238 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1239 return;
1240 }
1241
1242 /* always handle regular files and handle symlinked files if no -y */ 1494 /* always handle regular files and handle symlinked files if no -y */
1243 if (S_ISLNK(st.st_mode)) { 1495 if (S_ISLNK(st->st_mode)) {
1244 if (!scan_symlink) return; 1496 if (!scan_symlink) return 1;
1245 stat(filename, &st); 1497 stat(filename, &symlink_st);
1498 st = &symlink_st;
1246 } 1499 }
1500
1247 if (!S_ISREG(st.st_mode)) { 1501 if (!S_ISREG(st->st_mode)) {
1248 if (be_verbose > 2) printf("%s: skipping non-file\n", filename); 1502 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1249 return; 1503 return 1;
1250 } 1504 }
1251 1505
1506 if (match_perms) {
1507 if ((st->st_mode | match_perms) != st->st_mode)
1508 return 1;
1509 }
1252 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1) 1510 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1253 return; 1511 return 1;
1254 1512
1255 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives) 1513 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1256 /* 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 */
1257 scanelf_archive(filename, fd, st.st_size); 1515 scanelf_archive(filename, fd, st->st_size);
1258 1516
1259 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;
1260} 1529}
1261 1530
1262/* 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 */
1263static void scanelf_dir(const char *path) 1532static int scanelf_dir(const char *path)
1264{ 1533{
1265 register DIR *dir; 1534 register DIR *dir;
1266 register struct dirent *dentry; 1535 register struct dirent *dentry;
1267 struct stat st_top, st; 1536 struct stat st_top, st;
1268 char buf[__PAX_UTILS_PATH_MAX]; 1537 char buf[__PAX_UTILS_PATH_MAX];
1538 char _path[__PAX_UTILS_PATH_MAX];
1269 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);
1270 1543
1271 /* make sure path exists */ 1544 /* make sure path exists */
1272 if (lstat(path, &st_top) == -1) { 1545 if (lstat(path, &st_top) == -1) {
1273 if (be_verbose > 2) printf("%s: does not exist\n", path); 1546 if (be_verbose > 2) printf("%s: does not exist\n", path);
1274 return; 1547 return 1;
1275 } 1548 }
1276 1549
1277 /* 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 */
1278 if (!S_ISDIR(st_top.st_mode)) { 1551 if (!S_ISDIR(st_top.st_mode)) {
1279 scanelf_file(path); 1552 return scanelf_file(path, &st_top);
1280 return;
1281 } 1553 }
1282 1554
1283 /* now scan the dir looking for fun stuff */ 1555 /* now scan the dir looking for fun stuff */
1284 if ((dir = opendir(path)) == NULL) { 1556 if ((dir = opendir(path)) == NULL) {
1285 warnf("could not opendir %s: %s", path, strerror(errno)); 1557 warnf("could not opendir %s: %s", path, strerror(errno));
1286 return; 1558 return 1;
1287 } 1559 }
1288 if (be_verbose > 1) printf("%s: scanning dir\n", path); 1560 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1289 1561
1290 pathlen = strlen(path); 1562 pathlen = strlen(path);
1291 while ((dentry = readdir(dir))) { 1563 while ((dentry = readdir(dir))) {
1298 continue; 1570 continue;
1299 } 1571 }
1300 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);
1301 if (lstat(buf, &st) != -1) { 1573 if (lstat(buf, &st) != -1) {
1302 if (S_ISREG(st.st_mode)) 1574 if (S_ISREG(st.st_mode))
1303 scanelf_file(buf); 1575 ret = scanelf_file(buf, &st);
1304 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1576 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1305 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1577 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1306 scanelf_dir(buf); 1578 ret = scanelf_dir(buf);
1307 } 1579 }
1308 } 1580 }
1309 } 1581 }
1310 closedir(dir); 1582 closedir(dir);
1583 return ret;
1311} 1584}
1312 1585
1313static int scanelf_from_file(const char *filename) 1586static int scanelf_from_file(const char *filename)
1314{ 1587{
1315 FILE *fp = NULL; 1588 FILE *fp = NULL;
1316 char *p; 1589 char *p;
1317 char path[__PAX_UTILS_PATH_MAX]; 1590 char path[__PAX_UTILS_PATH_MAX];
1591 int ret = 0;
1318 1592
1319 if (strcmp(filename, "-") == 0) 1593 if (strcmp(filename, "-") == 0)
1320 fp = stdin; 1594 fp = stdin;
1321 else if ((fp = fopen(filename, "r")) == NULL) 1595 else if ((fp = fopen(filename, "r")) == NULL)
1322 return 1; 1596 return 1;
1323 1597
1324 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1598 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1325 if ((p = strchr(path, '\n')) != NULL) 1599 if ((p = strchr(path, '\n')) != NULL)
1326 *p = 0; 1600 *p = 0;
1327 search_path = path; 1601 search_path = path;
1328 scanelf_dir(path); 1602 ret = scanelf_dir(path);
1329 } 1603 }
1330 if (fp != stdin) 1604 if (fp != stdin)
1331 fclose(fp); 1605 fclose(fp);
1332 return 0; 1606 return ret;
1333} 1607}
1334 1608
1335#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__) 1609#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1336 1610
1337static int load_ld_cache_config(int i, const char *fname) 1611static int load_ld_cache_config(int i, const char *fname)
1338{ 1612{
1339 FILE *fp = NULL; 1613 FILE *fp = NULL;
1340 char *p; 1614 char *p;
1341 char path[__PAX_UTILS_PATH_MAX]; 1615 char path[__PAX_UTILS_PATH_MAX];
1616 char _fname[__PAX_UTILS_PATH_MAX];
1342 1617
1343 if (i + 1 == ARRAY_SIZE(ldpaths)) 1618 fname = maybe_add_root(fname, _fname);
1344 return i;
1345 1619
1346 if ((fp = fopen(fname, "r")) == NULL) 1620 if ((fp = fopen(fname, "r")) == NULL)
1347 return i; 1621 return i;
1348 1622
1349 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1623 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1350 if ((p = strrchr(path, '\r')) != NULL) 1624 if ((p = strrchr(path, '\r')) != NULL)
1351 *p = 0; 1625 *p = 0;
1352 if ((p = strchr(path, '\n')) != NULL) 1626 if ((p = strchr(path, '\n')) != NULL)
1353 *p = 0; 1627 *p = 0;
1354#ifdef __linux__ 1628
1355 // recursive includes of the same file will make this segfault. 1629 /* recursive includes of the same file will make this segfault. */
1356 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) { 1630 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1357 glob64_t gl; 1631 glob_t gl;
1358 size_t x; 1632 size_t x;
1359 char gpath[__PAX_UTILS_PATH_MAX]; 1633 char gpath[__PAX_UTILS_PATH_MAX];
1360 1634
1361 memset(gpath, 0, sizeof(gpath)); 1635 memset(gpath, 0, sizeof(gpath));
1636 if (root)
1637 strcpy(gpath, root);
1362 1638
1363 if (path[8] != '/') 1639 if (path[8] != '/')
1364 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]); 1640 snprintf(gpath+strlen(gpath), sizeof(gpath)-strlen(gpath), "/etc/%s", &path[8]);
1365 else 1641 else
1366 strncpy(gpath, &path[8], sizeof(gpath)); 1642 strncpy(gpath+strlen(gpath), &path[8], sizeof(gpath)-strlen(gpath));
1367 1643
1368 if ((glob64(gpath, 0, NULL, &gl)) == 0) { 1644 if (glob(gpath, 0, NULL, &gl) == 0) {
1369 for (x = 0; x < gl.gl_pathc; ++x) { 1645 for (x = 0; x < gl.gl_pathc; ++x) {
1370 /* try to avoid direct loops */ 1646 /* try to avoid direct loops */
1371 if (strcmp(gl.gl_pathv[x], fname) == 0) 1647 if (strcmp(gl.gl_pathv[x], fname) == 0)
1372 continue; 1648 continue;
1373 i = load_ld_cache_config(i, gl.gl_pathv[x]); 1649 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1374 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1375 globfree64(&gl);
1376 return i;
1377 }
1378 } 1650 }
1379 globfree64 (&gl); 1651 globfree(&gl);
1380 continue; 1652 continue;
1381 } else
1382 abort();
1383 } 1653 }
1384#endif 1654 }
1655
1385 if (*path != '/') 1656 if (*path != '/')
1386 continue; 1657 continue;
1387 1658
1388 ldpaths[i++] = xstrdup(path); 1659 xarraypush(ldpaths, path, strlen(path));
1389
1390 if (i + 1 == ARRAY_SIZE(ldpaths))
1391 break;
1392 } 1660 }
1393 ldpaths[i] = NULL;
1394 1661
1395 fclose(fp); 1662 fclose(fp);
1396 return i; 1663 return i;
1397} 1664}
1398 1665
1399#elif defined(__FreeBSD__) || (__DragonFly__) 1666#elif defined(__FreeBSD__) || defined(__DragonFly__)
1400 1667
1401static int load_ld_cache_config(int i, const char *fname) 1668static int load_ld_cache_config(int i, const char *fname)
1402{ 1669{
1403 FILE *fp = NULL; 1670 FILE *fp = NULL;
1404 char *b = NULL, *p; 1671 char *b = NULL, *p;
1405 struct elfhints_hdr hdr; 1672 struct elfhints_hdr hdr;
1673 char _fname[__PAX_UTILS_PATH_MAX];
1406 1674
1407 if (i + 1 == ARRAY_SIZE(ldpaths)) 1675 fname = maybe_add_root(fname, _fname);
1408 return i;
1409 1676
1410 if ((fp = fopen(fname, "r")) == NULL) 1677 if ((fp = fopen(fname, "r")) == NULL)
1411 return i; 1678 return i;
1412 1679
1413 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) || 1680 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1416 { 1683 {
1417 fclose(fp); 1684 fclose(fp);
1418 return i; 1685 return i;
1419 } 1686 }
1420 1687
1421 b = (char*)malloc(hdr.dirlistlen+1); 1688 b = xmalloc(hdr.dirlistlen + 1);
1422 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) { 1689 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1423 fclose(fp); 1690 fclose(fp);
1424 free(b); 1691 free(b);
1425 return i; 1692 return i;
1426 } 1693 }
1427 1694
1428 while ((p = strsep(&b, ":"))) { 1695 while ((p = strsep(&b, ":"))) {
1429 if (*p == '\0') continue; 1696 if (*p == '\0')
1430 ldpaths[i++] = xstrdup(p); 1697 continue;
1431 1698 xarraypush(ldpaths, p, strlen(p));
1432 if (i + 1 == ARRAY_SIZE(ldpaths))
1433 break;
1434 } 1699 }
1435 ldpaths[i] = NULL; 1700
1436
1437 free(b); 1701 free(b);
1438 fclose(fp); 1702 fclose(fp);
1439 return i; 1703 return i;
1440} 1704}
1441 1705
1442#else 1706#else
1443 1707#ifdef __ELF__
1444#warning Cache config support not implemented for your target 1708#warning Cache config support not implemented for your target
1709#endif
1445static int load_ld_cache_config(int i, const char *fname) 1710static int load_ld_cache_config(int i, const char *fname)
1446{ 1711{
1447 memset(ldpaths, 0x00, sizeof(ldpaths)); 1712 return 0;
1448} 1713}
1449
1450#endif 1714#endif
1451 1715
1452/* scan /etc/ld.so.conf for paths */ 1716/* scan /etc/ld.so.conf for paths */
1453static void scanelf_ldpath() 1717static void scanelf_ldpath(void)
1454{ 1718{
1455 char scan_l, scan_ul, scan_ull; 1719 char scan_l, scan_ul, scan_ull;
1720 size_t n;
1721 const char *ldpath;
1456 int i = 0; 1722 int i = 0;
1457 1723
1458 if (!ldpaths[0]) 1724 if (array_cnt(ldpaths) == 0)
1459 err("Unable to load any paths from ld.so.conf"); 1725 err("Unable to load any paths from ld.so.conf");
1460 1726
1461 scan_l = scan_ul = scan_ull = 0; 1727 scan_l = scan_ul = scan_ull = 0;
1462 1728
1463 while (ldpaths[i]) { 1729 array_for_each(ldpaths, n, ldpath) {
1464 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1; 1730 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = 1;
1465 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1; 1731 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = 1;
1466 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1; 1732 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = 1;
1467 scanelf_dir(ldpaths[i]); 1733 scanelf_dir(ldpath);
1468 ++i; 1734 ++i;
1469 } 1735 }
1470 1736
1471 if (!scan_l) scanelf_dir("/lib"); 1737 if (!scan_l) scanelf_dir("/lib");
1472 if (!scan_ul) scanelf_dir("/usr/lib"); 1738 if (!scan_ul) scanelf_dir("/usr/lib");
1473 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1739 if (!scan_ull) scanelf_dir("/usr/local/lib");
1474} 1740}
1475 1741
1476/* scan env PATH for paths */ 1742/* scan env PATH for paths */
1477static void scanelf_envpath() 1743static void scanelf_envpath(void)
1478{ 1744{
1479 char *path, *p; 1745 char *path, *p;
1480 1746
1481 path = getenv("PATH"); 1747 path = getenv("PATH");
1482 if (!path) 1748 if (!path)
1489 } 1755 }
1490 1756
1491 free(path); 1757 free(path);
1492} 1758}
1493 1759
1494/* usage / invocation handling functions */ 1760/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1495#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"
1496#define a_argument required_argument 1762#define a_argument required_argument
1497static struct option const long_opts[] = { 1763static struct option const long_opts[] = {
1498 {"path", no_argument, NULL, 'p'}, 1764 {"path", no_argument, NULL, 'p'},
1499 {"ldpath", no_argument, NULL, 'l'}, 1765 {"ldpath", no_argument, NULL, 'l'},
1766 {"root", a_argument, NULL, 128},
1500 {"recursive", no_argument, NULL, 'R'}, 1767 {"recursive", no_argument, NULL, 'R'},
1501 {"mount", no_argument, NULL, 'm'}, 1768 {"mount", no_argument, NULL, 'm'},
1502 {"symlink", no_argument, NULL, 'y'}, 1769 {"symlink", no_argument, NULL, 'y'},
1503 {"archives", no_argument, NULL, 'A'}, 1770 {"archives", no_argument, NULL, 'A'},
1504 {"ldcache", no_argument, NULL, 'L'}, 1771 {"ldcache", no_argument, NULL, 'L'},
1517 {"lib", a_argument, NULL, 'N'}, 1784 {"lib", a_argument, NULL, 'N'},
1518 {"gmatch", no_argument, NULL, 'g'}, 1785 {"gmatch", no_argument, NULL, 'g'},
1519 {"textrels", no_argument, NULL, 'T'}, 1786 {"textrels", no_argument, NULL, 'T'},
1520 {"etype", a_argument, NULL, 'E'}, 1787 {"etype", a_argument, NULL, 'E'},
1521 {"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'},
1522 {"all", no_argument, NULL, 'a'}, 1794 {"all", no_argument, NULL, 'a'},
1523 {"quiet", no_argument, NULL, 'q'}, 1795 {"quiet", no_argument, NULL, 'q'},
1524 {"verbose", no_argument, NULL, 'v'}, 1796 {"verbose", no_argument, NULL, 'v'},
1525 {"format", a_argument, NULL, 'F'}, 1797 {"format", a_argument, NULL, 'F'},
1526 {"from", a_argument, NULL, 'f'}, 1798 {"from", a_argument, NULL, 'f'},
1527 {"file", a_argument, NULL, 'o'}, 1799 {"file", a_argument, NULL, 'o'},
1800 {"nocolor", no_argument, NULL, 'C'},
1528 {"nobanner", no_argument, NULL, 'B'}, 1801 {"nobanner", no_argument, NULL, 'B'},
1529 {"help", no_argument, NULL, 'h'}, 1802 {"help", no_argument, NULL, 'h'},
1530 {"version", no_argument, NULL, 'V'}, 1803 {"version", no_argument, NULL, 'V'},
1531 {NULL, no_argument, NULL, 0x0} 1804 {NULL, no_argument, NULL, 0x0}
1532}; 1805};
1533 1806
1534static const char *opts_help[] = { 1807static const char * const opts_help[] = {
1535 "Scan all directories in PATH environment", 1808 "Scan all directories in PATH environment",
1536 "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)",
1537 "Scan directories recursively", 1811 "Scan directories recursively",
1538 "Don't recursively cross mount points", 1812 "Don't recursively cross mount points",
1539 "Don't scan symlinks", 1813 "Don't scan symlinks",
1540 "Scan archives (.a files)", 1814 "Scan archives (.a files)",
1541 "Utilize ld.so.cache information (use with -r/-n)", 1815 "Utilize ld.so.cache information (use with -r/-n)",
1550 "Print BIND information", 1824 "Print BIND information",
1551 "Print SONAME information", 1825 "Print SONAME information",
1552 "Find a specified symbol", 1826 "Find a specified symbol",
1553 "Find a specified section", 1827 "Find a specified section",
1554 "Find a specified library", 1828 "Find a specified library",
1555 "Use strncmp to match libraries. (use with -N)", 1829 "Use regex matching rather than string compare (use with -s)",
1556 "Locate cause of TEXTREL", 1830 "Locate cause of TEXTREL",
1557 "Print only ELF files matching etype ET_DYN,ET_EXEC ...", 1831 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1558 "Print only ELF files matching numeric bits", 1832 "Print only ELF files matching numeric bits",
1559 "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",
1560 "Only output 'bad' things", 1839 "Only output 'bad' things",
1561 "Be verbose (can be specified more than once)", 1840 "Be verbose (can be specified more than once)",
1562 "Use specified format for output", 1841 "Use specified format for output",
1563 "Read input stream from a filename", 1842 "Read input stream from a filename",
1564 "Write output stream to a filename", 1843 "Write output stream to a filename",
1844 "Don't emit color in output",
1565 "Don't display the header", 1845 "Don't display the header",
1566 "Print this help and exit", 1846 "Print this help and exit",
1567 "Print version and exit", 1847 "Print version and exit",
1568 NULL 1848 NULL
1569}; 1849};
1575 printf("* Scan ELF binaries for stuff\n\n" 1855 printf("* Scan ELF binaries for stuff\n\n"
1576 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0); 1856 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1577 printf("Options: -[%s]\n", PARSE_FLAGS); 1857 printf("Options: -[%s]\n", PARSE_FLAGS);
1578 for (i = 0; long_opts[i].name; ++i) 1858 for (i = 0; long_opts[i].name; ++i)
1579 if (long_opts[i].has_arg == no_argument) 1859 if (long_opts[i].has_arg == no_argument)
1580 printf(" -%c, --%-14s* %s\n", long_opts[i].val, 1860 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1861 long_opts[i].name, opts_help[i]);
1862 else if (long_opts[i].val > '~')
1863 printf(" --%-7s <arg> * %s\n",
1581 long_opts[i].name, opts_help[i]); 1864 long_opts[i].name, opts_help[i]);
1582 else 1865 else
1583 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val, 1866 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1584 long_opts[i].name, opts_help[i]); 1867 long_opts[i].name, opts_help[i]);
1585 1868
1586 if (status != EXIT_SUCCESS) 1869 puts("\nFor more information, see the scanelf(1) manpage");
1587 exit(status);
1588
1589 puts("\nThe format modifiers for the -F option are:");
1590 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1591 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1592 puts(" i INTERP \tb BIND \ts symbol");
1593 puts(" N library \to Type \tT TEXTRELs");
1594 puts(" S SONAME \tk section");
1595 puts(" p filename (with search path removed)");
1596 puts(" f filename (short name/basename)");
1597 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1598
1599 puts("\nELF Etypes:");
1600 print_etypes(stdout);
1601
1602 exit(status); 1870 exit(status);
1603} 1871}
1604 1872
1605/* 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 }
1606static void parseargs(int argc, char *argv[]) 1882static int parseargs(int argc, char *argv[])
1607{ 1883{
1608 int i; 1884 int i;
1609 const char *from_file = NULL; 1885 const char *from_file = NULL;
1886 int ret = 0;
1610 1887
1611 opterr = 0; 1888 opterr = 0;
1612 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) {
1613 switch (i) { 1890 switch (i) {
1614 1891
1622 case 'f': 1899 case 'f':
1623 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");
1624 from_file = optarg; 1901 from_file = optarg;
1625 break; 1902 break;
1626 case 'E': 1903 case 'E':
1627 strncpy(match_etypes, optarg, sizeof(match_etypes)); 1904 match_etypes = optarg;
1628 break; 1905 break;
1629 case 'M': 1906 case 'M':
1630 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;
1631 break; 1918 break;
1632 case 'o': { 1919 case 'o': {
1633 if (freopen(optarg, "w", stdout) == NULL) 1920 if (freopen(optarg, "w", stdout) == NULL)
1634 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1921 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1635 break; 1922 break;
1636 } 1923 }
1637 case 'k': 1924 case 'k':
1638 if (find_section) warn("You prob don't want to specify -k twice"); 1925 xarraypush(find_section_arr, optarg, strlen(optarg));
1639 find_section = optarg;
1640 break; 1926 break;
1641 case 's': { 1927 case 's': {
1642 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");
1643 find_sym = optarg; 1929 find_sym = optarg;
1644 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1645 sprintf(versioned_symname, "%s@", find_sym);
1646 break; 1930 break;
1647 } 1931 }
1648 case 'N': { 1932 case 'N':
1649 if (find_lib) warn("You prob don't want to specify -N twice"); 1933 xarraypush(find_lib_arr, optarg, strlen(optarg));
1650 find_lib = optarg;
1651 break; 1934 break;
1652 }
1653
1654 case 'F': { 1935 case 'F': {
1655 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");
1656 out_format = optarg; 1937 out_format = optarg;
1657 break; 1938 break;
1658 } 1939 }
1659 case 'z': { 1940 case 'z': {
1660 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC); 1941 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1661 size_t x; 1942 size_t x;
1662 1943
1663 for (x = 0 ; x < strlen(optarg); x++) { 1944 for (x = 0; x < strlen(optarg); x++) {
1664 switch(optarg[x]) { 1945 switch (optarg[x]) {
1665 case 'p': 1946 case 'p':
1666 case 'P': 1947 case 'P':
1667 do_state(optarg[x], PAGEEXEC); 1948 do_pax_state(optarg[x], PAGEEXEC);
1668 break; 1949 break;
1669 case 's': 1950 case 's':
1670 case 'S': 1951 case 'S':
1671 do_state(optarg[x], SEGMEXEC); 1952 do_pax_state(optarg[x], SEGMEXEC);
1672 break; 1953 break;
1673 case 'm': 1954 case 'm':
1674 case 'M': 1955 case 'M':
1675 do_state(optarg[x], MPROTECT); 1956 do_pax_state(optarg[x], MPROTECT);
1676 break; 1957 break;
1677 case 'e': 1958 case 'e':
1678 case 'E': 1959 case 'E':
1679 do_state(optarg[x], EMUTRAMP); 1960 do_pax_state(optarg[x], EMUTRAMP);
1680 break; 1961 break;
1681 case 'r': 1962 case 'r':
1682 case 'R': 1963 case 'R':
1683 do_state(optarg[x], RANDMMAP); 1964 do_pax_state(optarg[x], RANDMMAP);
1684 break; 1965 break;
1685 case 'x': 1966 case 'x':
1686 case 'X': 1967 case 'X':
1687 do_state(optarg[x], RANDEXEC); 1968 do_pax_state(optarg[x], RANDEXEC);
1688 break; 1969 break;
1689 default: 1970 default:
1690 break; 1971 break;
1691 } 1972 }
1692 } 1973 }
1697 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) || 1978 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1698 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)))) 1979 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1699 setpax = flags; 1980 setpax = flags;
1700 break; 1981 break;
1701 } 1982 }
1983 case 'Z': show_size = 1; break;
1702 case 'g': gmatch = 1; break; 1984 case 'g': g_match = 1; break;
1703 case 'L': use_ldcache = 1; break; 1985 case 'L': use_ldcache = 1; break;
1704 case 'y': scan_symlink = 0; break; 1986 case 'y': scan_symlink = 0; break;
1705 case 'A': scan_archives = 1; break; 1987 case 'A': scan_archives = 1; break;
1988 case 'C': color_init(true); break;
1706 case 'B': show_banner = 0; break; 1989 case 'B': show_banner = 0; break;
1707 case 'l': scan_ldpath = 1; break; 1990 case 'l': scan_ldpath = 1; break;
1708 case 'p': scan_envpath = 1; break; 1991 case 'p': scan_envpath = 1; break;
1709 case 'R': dir_recurse = 1; break; 1992 case 'R': dir_recurse = 1; break;
1710 case 'm': dir_crossmount = 0; break; 1993 case 'm': dir_crossmount = 0; break;
1718 case 'b': show_bind = 1; break; 2001 case 'b': show_bind = 1; break;
1719 case 'S': show_soname = 1; break; 2002 case 'S': show_soname = 1; break;
1720 case 'T': show_textrels = 1; break; 2003 case 'T': show_textrels = 1; break;
1721 case 'q': be_quiet = 1; break; 2004 case 'q': be_quiet = 1; break;
1722 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2005 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1723 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;
1724 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;
1725 case ':': 2013 case ':':
1726 err("Option '%c' is missing parameter", optopt); 2014 err("Option '%c' is missing parameter", optopt);
1727 case '?': 2015 case '?':
1728 err("Unknown option '%c' or argument missing", optopt); 2016 err("Unknown option '%c' or argument missing", optopt);
1729 default: 2017 default:
1730 err("Unhandled option '%c'; please report this", i); 2018 err("Unhandled option '%c'; please report this", i);
1731 } 2019 }
1732 } 2020 }
1733 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);
1734 /* let the format option override all other options */ 2030 /* let the format option override all other options */
1735 if (out_format) { 2031 if (out_format) {
1736 show_pax = show_phdr = show_textrel = show_rpath = \ 2032 show_pax = show_phdr = show_textrel = show_rpath = \
1737 show_needed = show_interp = show_bind = show_soname = \ 2033 show_needed = show_interp = show_bind = show_soname = \
1738 show_textrels = 0; 2034 show_textrels = show_perms = show_endian = show_size = \
2035 show_osabi = show_eabi = 0;
1739 for (i = 0; out_format[i]; ++i) { 2036 for (i = 0; out_format[i]; ++i) {
1740 if (!IS_MODIFIER(out_format[i])) continue; 2037 if (!IS_MODIFIER(out_format[i])) continue;
1741 2038
1742 switch (out_format[++i]) { 2039 switch (out_format[++i]) {
1743 case '+': break; 2040 case '+': break;
1748 case 'f': break; 2045 case 'f': break;
1749 case 'k': break; 2046 case 'k': break;
1750 case 's': break; 2047 case 's': break;
1751 case 'N': break; 2048 case 'N': break;
1752 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;
1753 case 'x': show_pax = 1; break; 2057 case 'x': show_pax = 1; break;
1754 case 'e': show_phdr = 1; break; 2058 case 'e': show_phdr = 1; break;
1755 case 't': show_textrel = 1; break; 2059 case 't': show_textrel = 1; break;
1756 case 'r': show_rpath = 1; break; 2060 case 'r': show_rpath = 1; break;
1757 case 'n': show_needed = 1; break; 2061 case 'n': show_needed = 1; break;
1758 case 'i': show_interp = 1; break; 2062 case 'i': show_interp = 1; break;
1759 case 'b': show_bind = 1; break; 2063 case 'b': show_bind = 1; break;
1760 case 'S': show_soname = 1; break; 2064 case 'S': show_soname = 1; break;
1761 case 'T': show_textrels = 1; break; 2065 case 'T': show_textrels = 1; break;
1762 default: 2066 default:
1763 err("Invalid format specifier '%c' (byte %i)", 2067 err("Invalid format specifier '%c' (byte %i)",
1764 out_format[i], i+1); 2068 out_format[i], i+1);
1765 } 2069 }
1766 } 2070 }
1767 2071
1768 /* construct our default format */ 2072 /* construct our default format */
1769 } else { 2073 } else {
1770 size_t fmt_len = 30; 2074 size_t fmt_len = 30;
1771 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2075 out_format = xmalloc(sizeof(char) * fmt_len);
2076 *out_format = '\0';
1772 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2077 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1773 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);
1774 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2084 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1775 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2085 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1776 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2086 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1777 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2087 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1778 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2088 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1799 } 2109 }
1800 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2110 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1801 err("Nothing to scan !?"); 2111 err("Nothing to scan !?");
1802 while (optind < argc) { 2112 while (optind < argc) {
1803 search_path = argv[optind++]; 2113 search_path = argv[optind++];
1804 scanelf_dir(search_path); 2114 ret = scanelf_dir(search_path);
1805 } 2115 }
1806 2116
1807 /* clean up */ 2117 /* clean up */
1808 free(versioned_symname);
1809 for (i = 0; ldpaths[i]; ++i)
1810 free(ldpaths[i]); 2118 xarrayfree(ldpaths);
2119 xarrayfree(find_lib_arr);
2120 xarrayfree(find_section_arr);
2121 free(find_lib);
2122 free(find_section);
1811 2123
1812 if (ldcache != 0) 2124 if (ldcache != 0)
1813 munmap(ldcache, ldcache_size); 2125 munmap(ldcache, ldcache_size);
2126 return ret;
1814} 2127}
1815 2128
1816static char **get_split_env(const char *envvar) 2129static char **get_split_env(const char *envvar)
1817{ 2130{
1818 const char *delims = " \t\n"; 2131 const char *delims = " \t\n";
1844 2157
1845 /* 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
1846 * the envvals array of strings */ 2159 * the envvals array of strings */
1847 return envvals; 2160 return envvals;
1848} 2161}
2162
1849static void parseenv() 2163static void parseenv(void)
1850{ 2164{
2165 color_init(false);
1851 qa_textrels = get_split_env("QA_TEXTRELS"); 2166 qa_textrels = get_split_env("QA_TEXTRELS");
1852 qa_execstack = get_split_env("QA_EXECSTACK"); 2167 qa_execstack = get_split_env("QA_EXECSTACK");
1853 qa_wx_load = get_split_env("QA_WX_LOAD"); 2168 qa_wx_load = get_split_env("QA_WX_LOAD");
1854} 2169}
2170
1855#ifdef __PAX_UTILS_CLEANUP 2171#ifdef __PAX_UTILS_CLEANUP
1856static void cleanup() 2172static void cleanup(void)
1857{ 2173{
1858 free(out_format); 2174 free(out_format);
1859 free(qa_textrels); 2175 free(qa_textrels);
1860 free(qa_execstack); 2176 free(qa_execstack);
1861 free(qa_wx_load); 2177 free(qa_wx_load);
1862} 2178}
1863#endif 2179#endif
1864 2180
1865
1866
1867int main(int argc, char *argv[]) 2181int main(int argc, char *argv[])
1868{ 2182{
2183 int ret;
1869 if (argc < 2) 2184 if (argc < 2)
1870 usage(EXIT_FAILURE); 2185 usage(EXIT_FAILURE);
1871 parseenv(); 2186 parseenv();
1872 parseargs(argc, argv); 2187 ret = parseargs(argc, argv);
1873 fclose(stdout); 2188 fclose(stdout);
1874#ifdef __PAX_UTILS_CLEANUP 2189#ifdef __PAX_UTILS_CLEANUP
1875 cleanup(); 2190 cleanup();
1876 warn("The calls to add/delete heap should be off:\n" 2191 warn("The calls to add/delete heap should be off:\n"
1877 "\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"
1878 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD"); 2193 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1879#endif 2194#endif
1880 return EXIT_SUCCESS;
1881}
1882
1883
1884
1885/* utility funcs */
1886static char *xstrdup(const char *s)
1887{
1888 char *ret = strdup(s);
1889 if (!ret) err("Could not strdup(): %s", strerror(errno));
1890 return ret; 2195 return ret;
1891}
1892static void *xmalloc(size_t size)
1893{
1894 void *ret = malloc(size);
1895 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1896 return ret;
1897}
1898static void *xrealloc(void *ptr, size_t size)
1899{
1900 void *ret = realloc(ptr, size);
1901 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
1902 return ret;
1903}
1904static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1905{
1906 size_t new_len;
1907
1908 new_len = strlen(*dst) + strlen(src);
1909 if (*curr_len <= new_len) {
1910 *curr_len = new_len + (*curr_len / 2);
1911 *dst = realloc(*dst, *curr_len);
1912 if (!*dst)
1913 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1914 }
1915
1916 if (n)
1917 strncat(*dst, src, n);
1918 else
1919 strcat(*dst, src);
1920}
1921static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1922{
1923 static char my_app[2];
1924 my_app[0] = append;
1925 my_app[1] = '\0';
1926 xstrcat(dst, my_app, curr_len);
1927} 2196}
1928 2197
1929/* Match filename against entries in matchlist, return TRUE 2198/* Match filename against entries in matchlist, return TRUE
1930 * if the file is listed */ 2199 * if the file is listed */
1931static int file_matches_list(const char *filename, char **matchlist) 2200static int file_matches_list(const char *filename, char **matchlist)

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