/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.154 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 1.154 2006/06/03 18:25:18 solar 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 1.154 2006/06/03 18:25:18 solar 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
88/* utility funcs */ 70static int has_objdump = 0;
71
72/* find the path to a file by name */
89static char *xstrdup(const char *s) 73static char *which(const char *fname)
90{ 74{
91 char *ret = strdup(s); 75 static char fullpath[__PAX_UTILS_PATH_MAX];
92 if (!ret) err("Could not strdup(): %s", strerror(errno)); 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
93 return ret; 117 return ret;
94} 118}
95static void *xmalloc(size_t size)
96{
97 void *ret = malloc(size);
98 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
99 return ret;
100}
101static void *xrealloc(void *ptr, size_t size)
102{
103 void *ret = realloc(ptr, size);
104 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
105 return ret;
106}
107static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
108{
109 size_t new_len;
110
111 new_len = strlen(*dst) + strlen(src);
112 if (*curr_len <= new_len) {
113 *curr_len = new_len + (*curr_len / 2);
114 *dst = realloc(*dst, *curr_len);
115 if (!*dst)
116 err("could not realloc() %li bytes", (unsigned long)*curr_len);
117 }
118
119 if (n)
120 strncat(*dst, src, n);
121 else
122 strcat(*dst, src);
123}
124static inline void xchrcat(char **dst, const char append, size_t *curr_len)
125{
126 static char my_app[2];
127 my_app[0] = append;
128 my_app[1] = '\0';
129 xstrcat(dst, my_app, curr_len);
130}
131
132/* Match filename against entries in matchlist, return TRUE
133 * if the file is listed */
134static int file_matches_list(const char *filename, char **matchlist)
135{
136 char **file;
137 char *match;
138 char buf[__PAX_UTILS_PATH_MAX];
139
140 if (matchlist == NULL)
141 return 0;
142
143 for (file = matchlist; *file != NULL; file++) {
144 if (search_path) {
145 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
146 match = buf;
147 } else {
148 match = *file;
149 }
150 if (fnmatch(match, filename, 0) == 0)
151 return 1;
152 }
153 return 0;
154}
155
156
157 119
158/* sub-funcs for scanelf_file() */ 120/* sub-funcs for scanelf_file() */
159static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 121static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
160{ 122{
161 /* 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
162#define GET_SYMTABS(B) \ 132#define GET_SYMTABS(B) \
163 if (elf->elf_class == ELFCLASS ## B) { \ 133 if (elf->elf_class == ELFCLASS ## B) { \
164 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
165 /* debug sections */ \
166 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
167 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
168 /* runtime sections */ \
169 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
170 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
171 if (symtab && dynsym) { \ 134 if (symtab && dynsym) { \
135 Elf ## B ## _Shdr *esymtab = symtab; \
136 Elf ## B ## _Shdr *edynsym = dynsym; \
172 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 137 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
173 } else { \ 138 } else \
174 *sym = (void*)(symtab ? symtab : dynsym); \ 139 *sym = symtab ? symtab : dynsym; \
175 } \
176 if (strtab && dynstr) { \ 140 if (strtab && dynstr) { \
141 Elf ## B ## _Shdr *estrtab = strtab; \
142 Elf ## B ## _Shdr *edynstr = dynstr; \
177 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ 143 *tab = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
178 } else { \ 144 } else \
179 *tab = (void*)(strtab ? strtab : dynstr); \ 145 *tab = strtab ? strtab : dynstr; \
180 } \
181 } 146 }
182 GET_SYMTABS(32) 147 GET_SYMTABS(32)
183 GET_SYMTABS(64) 148 GET_SYMTABS(64)
184} 149}
185 150
214 } \ 179 } \
215 } 180 }
216 SHOW_PAX(32) 181 SHOW_PAX(32)
217 SHOW_PAX(64) 182 SHOW_PAX(64)
218 } 183 }
219
220 184
221 if (fix_elf && setpax) { 185 if (fix_elf && setpax) {
222 /* set the chpax settings */ 186 /* set the chpax settings */
223 if (elf->elf_class == ELFCLASS32) { 187 if (elf->elf_class == ELFCLASS32) {
224 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)
283 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 247 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
284 found = found_relro; \ 248 found = found_relro; \
285 offset = 4; \ 249 offset = 4; \
286 check_flags = PF_X; \ 250 check_flags = PF_X; \
287 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 251 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
288 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) \
289 if (multi_load++ > max_pt_load) \ 253 if (multi_load++ > max_pt_load) \
290 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); \
291 if (file_matches_list(elf->filename, qa_wx_load)) \ 255 if (file_matches_list(elf->filename, qa_wx_load)) \
292 continue; \ 256 continue; \
293 found = found_load; \ 257 found = found_load; \
310 } else if (elf->shdr != NULL) { \ 274 } else if (elf->shdr != NULL) { \
311 /* no program headers which means this is prob an object file */ \ 275 /* no program headers which means this is prob an object file */ \
312 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 276 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
313 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 277 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
314 char *str; \ 278 char *str; \
315 if ((void*)strtbl > (void*)elf->data_end) \ 279 if ((void*)strtbl > elf->data_end) \
316 goto skip_this_shdr##B; \ 280 goto skip_this_shdr##B; \
317 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 281 check_flags = SHF_WRITE|SHF_EXECINSTR; \
318 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 282 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
319 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 283 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
320 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 284 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
334 break; \ 298 break; \
335 } \ 299 } \
336 } \ 300 } \
337 skip_this_shdr##B: \ 301 skip_this_shdr##B: \
338 if (!multi_stack) { \ 302 if (!multi_stack) { \
303 if (file_matches_list(elf->filename, qa_execstack)) \
304 return NULL; \
339 *found_phdr = 1; \ 305 *found_phdr = 1; \
340 shown = 1; \ 306 shown = 1; \
341 memcpy(ret, "!WX", 3); \ 307 memcpy(ret, "!WX", 3); \
342 } \ 308 } \
343 } \ 309 } \
349 return NULL; 315 return NULL;
350 else 316 else
351 return ret; 317 return ret;
352} 318}
353 319
320/*
321 * See if this ELF contains a DT_TEXTREL tag in any of its
322 * PT_DYNAMIC sections.
323 */
354static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 324static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
355{ 325{
356 static const char *ret = "TEXTREL"; 326 static const char *ret = "TEXTREL";
357 unsigned long i; 327 unsigned long i;
358 328
366 Elf ## B ## _Dyn *dyn; \ 336 Elf ## B ## _Dyn *dyn; \
367 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 337 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
368 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 338 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
369 Elf ## B ## _Off offset; \ 339 Elf ## B ## _Off offset; \
370 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 340 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
371 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; \
372 offset = EGET(phdr[i].p_offset); \ 342 offset = EGET(phdr[i].p_offset); \
373 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 343 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
374 dyn = DYN ## B (elf->data + offset); \ 344 dyn = DYN ## B (elf->vdata + offset); \
375 while (EGET(dyn->d_tag) != DT_NULL) { \ 345 while (EGET(dyn->d_tag) != DT_NULL) { \
376 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)*/ \
377 *found_textrel = 1; \ 347 *found_textrel = 1; \
378 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 348 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
379 return (be_wewy_wewy_quiet ? NULL : ret); \ 349 return (be_wewy_wewy_quiet ? NULL : ret); \
388 if (be_quiet || be_wewy_wewy_quiet) 358 if (be_quiet || be_wewy_wewy_quiet)
389 return NULL; 359 return NULL;
390 else 360 else
391 return " - "; 361 return " - ";
392} 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 */
393static 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)
394{ 370{
395 unsigned long s, r, rmax; 371 unsigned long s, r, rmax;
396 void *symtab_void, *strtab_void, *text_void; 372 void *symtab_void, *strtab_void, *text_void;
397 373
418 Elf ## B ## _Rela *rela; \ 394 Elf ## B ## _Rela *rela; \
419 /* search the section headers for relocations */ \ 395 /* search the section headers for relocations */ \
420 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 396 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
421 uint32_t sh_type = EGET(shdr[s].sh_type); \ 397 uint32_t sh_type = EGET(shdr[s].sh_type); \
422 if (sh_type == SHT_REL) { \ 398 if (sh_type == SHT_REL) { \
423 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 399 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
424 rela = NULL; \ 400 rela = NULL; \
425 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 401 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
426 } else if (sh_type == SHT_RELA) { \ 402 } else if (sh_type == SHT_RELA) { \
427 rel = NULL; \ 403 rel = NULL; \
428 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 404 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
429 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 405 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
430 } else \ 406 } else \
431 continue; \ 407 continue; \
432 /* now see if any of the relocs are in the .text */ \ 408 /* now see if any of the relocs are in the .text */ \
433 for (r = 0; r < rmax; ++r) { \ 409 for (r = 0; r < rmax; ++r) { \
448 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 424 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
449 if (be_verbose <= 2) continue; \ 425 if (be_verbose <= 2) continue; \
450 } else \ 426 } else \
451 *found_textrels = 1; \ 427 *found_textrels = 1; \
452 /* locate this relocation symbol name */ \ 428 /* locate this relocation symbol name */ \
453 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 429 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
454 if ((void*)sym > (void*)elf->data_end) { \ 430 if ((void*)sym > elf->data_end) { \
455 warn("%s: corrupt ELF symbol", elf->filename); \ 431 warn("%s: corrupt ELF symbol", elf->filename); \
456 continue; \ 432 continue; \
457 } \ 433 } \
458 sym_max = ELF ## B ## _R_SYM(r_info); \ 434 sym_max = ELF ## B ## _R_SYM(r_info); \
459 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 435 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
462 sym = NULL; \ 438 sym = NULL; \
463 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 439 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
464 /* show the raw details about this reloc */ \ 440 /* show the raw details about this reloc */ \
465 printf(" %s: ", elf->base_filename); \ 441 printf(" %s: ", elf->base_filename); \
466 if (sym && sym->st_name) \ 442 if (sym && sym->st_name) \
467 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)); \
468 else \ 444 else \
469 printf("(memory/fake?)"); \ 445 printf("(memory/data?)"); \
470 printf(" [0x%lX]", (unsigned long)r_offset); \ 446 printf(" [0x%lX]", (unsigned long)r_offset); \
471 /* 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 */ \
472 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 448 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
473 func = NULL; \ 449 func = NULL; \
474 offset_tmp = 0; \ 450 offset_tmp = 0; \
475 while (sym_max--) { \ 451 while (sym_max--) { \
476 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) { \
477 func = sym; \ 453 func = sym; \
478 offset_tmp = EGET(sym->st_value); \ 454 offset_tmp = EGET(sym->st_value); \
479 } \ 455 } \
480 ++sym; \ 456 ++sym; \
481 } \ 457 } \
482 printf(" in "); \ 458 printf(" in "); \
483 if (func && func->st_name) \ 459 if (func && func->st_name) { \
484 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); \
485 else \ 463 else \
486 printf("(NULL: fake?)"); \ 464 printf("%s", func_name); \
465 } else \
466 printf("(optimized out)"); \
487 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 } \
488 } \ 489 } \
489 } } 490 } }
490 SHOW_TEXTRELS(32) 491 SHOW_TEXTRELS(32)
491 SHOW_TEXTRELS(64) 492 SHOW_TEXTRELS(64)
492 } 493 }
494 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);
495 496
496 return NULL; 497 return NULL;
497} 498}
498 499
499static void rpath_security_checks(elfobj *, char *, const char *);
500static 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)
501{ 501{
502 struct stat st; 502 struct stat st;
503 switch (*item) { 503 switch (*item) {
504 case '/': break; 504 case '/': break;
510 warnf("Security problem NULL %s in %s", dt_type, elf->filename); 510 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
511 break; 511 break;
512 case '$': 512 case '$':
513 if (fstat(elf->fd, &st) != -1) 513 if (fstat(elf->fd, &st) != -1)
514 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 514 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
515 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",
516 dt_type, item, elf->filename, st.st_mode & 07777); 516 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
517 break; 517 break;
518 default: 518 default:
519 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);
520 break; 520 break;
521 } 521 }
522} 522}
523static 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)
524{ 524{
525 unsigned long i, s; 525 unsigned long i;
526 char *rpath, *runpath, **r; 526 char *rpath, *runpath, **r;
527 void *strtbl_void; 527 void *strtbl_void;
528 528
529 if (!show_rpath) return; 529 if (!show_rpath) return;
530 530
541 Elf ## B ## _Off offset; \ 541 Elf ## B ## _Off offset; \
542 Elf ## B ## _Xword word; \ 542 Elf ## B ## _Xword word; \
543 /* Scan all the program headers */ \ 543 /* Scan all the program headers */ \
544 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 544 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
545 /* Just scan dynamic headers */ \ 545 /* Just scan dynamic headers */ \
546 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; \
547 offset = EGET(phdr[i].p_offset); \ 547 offset = EGET(phdr[i].p_offset); \
548 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 548 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
549 /* Just scan dynamic RPATH/RUNPATH headers */ \ 549 /* Just scan dynamic RPATH/RUNPATH headers */ \
550 dyn = DYN ## B (elf->data + offset); \ 550 dyn = DYN ## B (elf->vdata + offset); \
551 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 551 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
552 if (word == DT_RPATH) { \ 552 if (word == DT_RPATH) { \
553 r = &rpath; \ 553 r = &rpath; \
554 } else if (word == DT_RUNPATH) { \ 554 } else if (word == DT_RUNPATH) { \
555 r = &runpath; \ 555 r = &runpath; \
559 } \ 559 } \
560 /* Verify the memory is somewhat sane */ \ 560 /* Verify the memory is somewhat sane */ \
561 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 561 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
562 if (offset < (Elf ## B ## _Off)elf->len) { \ 562 if (offset < (Elf ## B ## _Off)elf->len) { \
563 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 563 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
564 *r = (char*)(elf->data + offset); \ 564 *r = elf->data + offset; \
565 /* 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 */ \
566 if (fix_elf) \ 566 if (fix_elf) \
567 offset = strlen(*r); \ 567 offset = strlen(*r); \
568 /* If quiet, don't output paths in ld.so.conf */ \ 568 /* If quiet, don't output paths in ld.so.conf */ \
569 if (be_quiet) { \ 569 if (be_quiet) { \
575 /* scan each path in : delimited list */ \ 575 /* scan each path in : delimited list */ \
576 while (start) { \ 576 while (start) { \
577 rpath_security_checks(elf, start, get_elfdtype(word)); \ 577 rpath_security_checks(elf, start, get_elfdtype(word)); \
578 end = strchr(start, ':'); \ 578 end = strchr(start, ':'); \
579 len = (end ? abs(end - start) : strlen(start)); \ 579 len = (end ? abs(end - start) : strlen(start)); \
580 if (use_ldcache) \ 580 if (use_ldcache) { \
581 for (s = 0; ldpaths[s]; ++s) \ 581 size_t n; \
582 const char *ldpath; \
583 array_for_each(ldpaths, n, ldpath) \
582 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 584 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
583 *r = end; \ 585 *r = end; \
584 /* corner case ... if RPATH reads "/usr/lib:", we want \ 586 /* corner case ... if RPATH reads "/usr/lib:", we want \
585 * to show ':' rather than '' */ \ 587 * to show ':' rather than '' */ \
586 if (end && end[1] != '\0') \ 588 if (end && end[1] != '\0') \
587 (*r)++; \ 589 (*r)++; \
588 break; \ 590 break; \
589 } \ 591 } \
592 } \
590 if (!*r || !end) \ 593 if (!*r || !end) \
591 break; \ 594 break; \
592 else \ 595 else \
593 start = start + len + 1; \ 596 start = start + len + 1; \
594 } \ 597 } \
679#define FLAG_S390_LIB64 0x0400 682#define FLAG_S390_LIB64 0x0400
680#define FLAG_POWERPC_LIB64 0x0500 683#define FLAG_POWERPC_LIB64 0x0500
681#define FLAG_MIPS64_LIBN32 0x0600 684#define FLAG_MIPS64_LIBN32 0x0600
682#define FLAG_MIPS64_LIBN64 0x0700 685#define FLAG_MIPS64_LIBN64 0x0700
683 686
684static char *lookup_cache_lib(elfobj *, char *);
685
686#if defined(__GLIBC__) || defined(__UCLIBC__) 687#if defined(__GLIBC__) || defined(__UCLIBC__)
687 688
688static char *lookup_cache_lib(elfobj *elf, char *fname) 689static char *lookup_cache_lib(elfobj *elf, char *fname)
689{ 690{
690 int fd = 0; 691 int fd;
691 char *strs; 692 char *strs;
692 static char buf[__PAX_UTILS_PATH_MAX] = ""; 693 static char buf[__PAX_UTILS_PATH_MAX] = "";
693 const char *cachefile = "/etc/ld.so.cache"; 694 const char cachefile[] = "/etc/ld.so.cache";
694 struct stat st; 695 struct stat st;
695 696
696 typedef struct { 697 typedef struct {
697 char magic[LDSO_CACHE_MAGIC_LEN]; 698 char magic[LDSO_CACHE_MAGIC_LEN];
698 char version[LDSO_CACHE_VER_LEN]; 699 char version[LDSO_CACHE_VER_LEN];
708 libentry_t *libent; 709 libentry_t *libent;
709 710
710 if (fname == NULL) 711 if (fname == NULL)
711 return NULL; 712 return NULL;
712 713
713 if (ldcache == 0) { 714 if (ldcache == NULL) {
714 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)
715 return NULL; 720 return NULL;
716 721
717 /* 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 */
718 ldcache_size = st.st_size; 723 ldcache_size = st.st_size;
719 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0); 724 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
720
721 close(fd); 725 close(fd);
722 726
723 if (ldcache == (caddr_t)-1) { 727 if (ldcache == MAP_FAILED) {
724 ldcache = 0; 728 ldcache = NULL;
725 return NULL; 729 return NULL;
726 } 730 }
727 731
728 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;
729 return NULL; 737 return NULL;
730 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
731 return NULL;
732 } 738 }
739 } else
740 header = ldcache;
733 741
734 header = (header_t *) ldcache;
735 libent = (libentry_t *) (ldcache + sizeof(header_t)); 742 libent = ldcache + sizeof(header_t);
736 strs = (char *) &libent[header->nlibs]; 743 strs = (char *) &libent[header->nlibs];
737 744
738 for (fd = 0; fd < header->nlibs; fd++) { 745 for (fd = 0; fd < header->nlibs; ++fd) {
739 /* 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
740 * diff arches will not be cached together. and we ignore the 747 * diff arches will not be cached together, and we ignore the
741 * the different multilib mips cases. */ 748 * the different multilib mips cases.
749 */
742 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK)) 750 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
743 continue; 751 continue;
744 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK)) 752 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
745 continue; 753 continue;
746 754
747 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 755 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
748 continue; 756 continue;
757
758 /* Return first hit because that is how the ldso rolls */
749 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 759 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
760 break;
750 } 761 }
762
751 return buf; 763 return buf;
752} 764}
765
753#elif defined(__NetBSD__) 766#elif defined(__NetBSD__)
754static char *lookup_cache_lib(elfobj *elf, char *fname) 767static char *lookup_cache_lib(elfobj *elf, char *fname)
755{ 768{
756 static char buf[__PAX_UTILS_PATH_MAX] = ""; 769 static char buf[__PAX_UTILS_PATH_MAX] = "";
757 static struct stat st; 770 static struct stat st;
758 771 size_t n;
759 char **ldpath; 772 char *ldpath;
760 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) { 773
774 array_for_each(ldpath, n, ldpath) {
761 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))
762 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 */
763 777
764 if (stat(buf, &st) != 0) 778 if (stat(buf, &st) != 0)
765 continue; /* if the lib doesn't exist in *ldpath, look further */ 779 continue; /* if the lib doesn't exist in *ldpath, look further */
766 780
774 788
775 /* not found in any path */ 789 /* not found in any path */
776 return NULL; 790 return NULL;
777} 791}
778#else 792#else
793#ifdef __ELF__
779#warning Cache support not implemented for your target 794#warning Cache support not implemented for your target
795#endif
780static char *lookup_cache_lib(elfobj *elf, char *fname) 796static char *lookup_cache_lib(elfobj *elf, char *fname)
781{ 797{
782 return NULL; 798 return NULL;
783} 799}
784#endif 800#endif
788 unsigned long i; 804 unsigned long i;
789 char *needed; 805 char *needed;
790 void *strtbl_void; 806 void *strtbl_void;
791 char *p; 807 char *p;
792 808
809 /*
810 * -n -> op==0 -> print all
811 * -N -> op==1 -> print requested
812 */
793 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 813 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
814 return NULL;
794 815
795 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 816 strtbl_void = elf_findsecbyname(elf, ".dynstr");
796 817
797 if (elf->phdr && strtbl_void) { 818 if (elf->phdr && strtbl_void) {
798#define SHOW_NEEDED(B) \ 819#define SHOW_NEEDED(B) \
800 Elf ## B ## _Dyn *dyn; \ 821 Elf ## B ## _Dyn *dyn; \
801 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 822 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
802 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 823 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
803 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 824 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
804 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 */ \
805 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 828 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
806 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; \
807 offset = EGET(phdr[i].p_offset); \ 831 offset = EGET(phdr[i].p_offset); \
808 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 */ \
809 dyn = DYN ## B (elf->data + offset); \ 835 dyn = DYN ## B (elf->vdata + offset); \
810 while (EGET(dyn->d_tag) != DT_NULL) { \ 836 while (EGET(dyn->d_tag) != DT_NULL) { \
811 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 837 if (EGET(dyn->d_tag) == DT_NEEDED) { \
812 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 838 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
813 if (offset >= (Elf ## B ## _Off)elf->len) { \ 839 if (offset >= (Elf ## B ## _Off)elf->len) { \
814 ++dyn; \ 840 ++dyn; \
815 continue; \ 841 continue; \
816 } \ 842 } \
817 needed = (char*)(elf->data + offset); \ 843 needed = elf->data + offset; \
818 if (op == 0) { \ 844 if (op == 0) { \
845 /* -n -> print all entries */ \
819 if (!be_wewy_wewy_quiet) { \ 846 if (!be_wewy_wewy_quiet) { \
820 if (*found_needed) xchrcat(ret, ',', ret_len); \ 847 if (*found_needed) xchrcat(ret, ',', ret_len); \
821 if (use_ldcache) \ 848 if (use_ldcache) \
822 if ((p = lookup_cache_lib(elf, needed)) != NULL) \ 849 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
823 needed = p; \ 850 needed = p; \
824 xstrcat(ret, needed, ret_len); \ 851 xstrcat(ret, needed, ret_len); \
825 } \ 852 } \
826 *found_needed = 1; \ 853 *found_needed = 1; \
827 } else { \ 854 } else { \
828 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)) { \
829 *found_lib = 1; \ 864 *found_lib = 1; \
830 return (be_wewy_wewy_quiet ? NULL : needed); \ 865 return (be_wewy_wewy_quiet ? NULL : find_lib); \
831 } \ 866 } \
832 } \ 867 } \
833 } \ 868 } \
834 ++dyn; \ 869 ++dyn; \
835 } \ 870 } \
876 Elf ## B ## _Dyn *dyn; \ 911 Elf ## B ## _Dyn *dyn; \
877 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 912 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
878 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 913 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
879 Elf ## B ## _Off offset; \ 914 Elf ## B ## _Off offset; \
880 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 915 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
881 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; \
882 dynamic = 1; \ 917 dynamic = 1; \
883 offset = EGET(phdr[i].p_offset); \ 918 offset = EGET(phdr[i].p_offset); \
884 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 919 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
885 dyn = DYN ## B (elf->data + offset); \ 920 dyn = DYN ## B (elf->vdata + offset); \
886 while (EGET(dyn->d_tag) != DT_NULL) { \ 921 while (EGET(dyn->d_tag) != DT_NULL) { \
887 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 922 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
888 (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)) \
889 { \ 924 { \
890 if (be_quiet) return NULL; \ 925 if (be_quiet) return NULL; \
898 SHOW_BIND(32) 933 SHOW_BIND(32)
899 SHOW_BIND(64) 934 SHOW_BIND(64)
900 935
901 if (be_wewy_wewy_quiet) return NULL; 936 if (be_wewy_wewy_quiet) return NULL;
902 937
938 /* don't output anything if quiet mode and the ELF is static or not setuid */
903 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))))) {
904 return NULL; 940 return NULL;
905 } else { 941 } else {
906 *found_bind = 1; 942 *found_bind = 1;
907 return (char *) (dynamic ? "LAZY" : "STATIC"); 943 return (char *)(dynamic ? "LAZY" : "STATIC");
908 } 944 }
909} 945}
910static char *scanelf_file_soname(elfobj *elf, char *found_soname) 946static char *scanelf_file_soname(elfobj *elf, char *found_soname)
911{ 947{
912 unsigned long i; 948 unsigned long i;
924 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 960 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
925 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 961 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
926 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 962 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
927 Elf ## B ## _Off offset; \ 963 Elf ## B ## _Off offset; \
928 /* only look for soname in shared objects */ \ 964 /* only look for soname in shared objects */ \
929 if (ehdr->e_type != ET_DYN) \ 965 if (EGET(ehdr->e_type) != ET_DYN) \
930 return NULL; \ 966 return NULL; \
931 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 967 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
932 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; \
933 offset = EGET(phdr[i].p_offset); \ 969 offset = EGET(phdr[i].p_offset); \
934 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 970 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
935 dyn = DYN ## B (elf->data + offset); \ 971 dyn = DYN ## B (elf->vdata + offset); \
936 while (EGET(dyn->d_tag) != DT_NULL) { \ 972 while (EGET(dyn->d_tag) != DT_NULL) { \
937 if (EGET(dyn->d_tag) == DT_SONAME) { \ 973 if (EGET(dyn->d_tag) == DT_SONAME) { \
938 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 974 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
939 if (offset >= (Elf ## B ## _Off)elf->len) { \ 975 if (offset >= (Elf ## B ## _Off)elf->len) { \
940 ++dyn; \ 976 ++dyn; \
941 continue; \ 977 continue; \
942 } \ 978 } \
943 soname = (char*)(elf->data + offset); \ 979 soname = elf->data + offset; \
944 *found_soname = 1; \ 980 *found_soname = 1; \
945 return (be_wewy_wewy_quiet ? NULL : soname); \ 981 return (be_wewy_wewy_quiet ? NULL : soname); \
946 } \ 982 } \
947 ++dyn; \ 983 ++dyn; \
948 } \ 984 } \
951 SHOW_SONAME(64) 987 SHOW_SONAME(64)
952 } 988 }
953 989
954 return NULL; 990 return NULL;
955} 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
956static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1160static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
957{ 1161{
958 unsigned long i; 1162 unsigned long i;
959 char *ret; 1163 char *ret;
960 void *symtab_void, *strtab_void; 1164 void *symtab_void, *strtab_void;
961 1165
962 if (!find_sym) return NULL; 1166 if (!find_sym) return NULL;
963 ret = find_sym; 1167 ret = NULL;
964 1168
965 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1169 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
966 1170
967 if (symtab_void && strtab_void) { 1171 if (symtab_void && strtab_void) {
968#define FIND_SYM(B) \ 1172#define FIND_SYM(B) \
969 if (elf->elf_class == ELFCLASS ## B) { \ 1173 if (elf->elf_class == ELFCLASS ## B) { \
970 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1174 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
971 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1175 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
972 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)); \
973 unsigned long cnt = EGET(symtab->sh_entsize); \ 1177 unsigned long cnt = EGET(symtab->sh_entsize); \
974 char *symname; \ 1178 char *symname; \
1179 size_t ret_len = 0; \
975 if (cnt) \ 1180 if (cnt) \
976 cnt = EGET(symtab->sh_size) / cnt; \ 1181 cnt = EGET(symtab->sh_size) / cnt; \
977 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 } \
978 if (sym->st_name) { \ 1187 if (sym->st_name) { \
979 /* make sure the symbol name is in acceptable memory range */ \ 1188 /* make sure the symbol name is in acceptable memory range */ \
980 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1189 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
981 if ((void*)symname > (void*)elf->data_end) { \ 1190 if ((void*)symname > elf->data_end) { \
982 warnf("%s: corrupt ELF symbols", elf->filename); \ 1191 warnf("%s: corrupt ELF symbols", elf->filename); \
983 ++sym; \ 1192 ++sym; \
984 continue; \ 1193 continue; \
985 } \ 1194 } \
986 /* debug display ... show all symbols and some extra info */ \ 1195 scanelf_match_symname(elf, found_sym, \
987 if (*ret == '*') { \ 1196 &ret, &ret_len, symname, \
988 printf("%s(%s) %5lX %15s %s\n", \ 1197 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
989 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1198 ELF##B##_ST_BIND(EGET(sym->st_info)), \
990 elf->base_filename, \ 1199 EGET(sym->st_shndx), \
991 (unsigned long)sym->st_size, \ 1200 /* st_size can be 64bit, but no one is really that big, so screw em */ \
992 get_elfstttype(sym->st_info), \ 1201 EGET(sym->st_size)); \
993 symname); \
994 *found_sym = 1; \
995 } else { \
996 /* allow the user to specify a comma delimited list of symbols to search for */ \
997 char *this_sym, *next_sym; \
998 this_sym = ret; \
999 do { \
1000 next_sym = strchr(this_sym, ','); \
1001 if (next_sym == NULL) \
1002 next_sym = this_sym + strlen(this_sym); \
1003 /* do we want a defined symbol ? */ \
1004 if (*this_sym == '+') { \
1005 if (sym->st_shndx == SHN_UNDEF) \
1006 goto skip_this_sym##B; \
1007 ++this_sym; \
1008 /* do we want an undefined symbol ? */ \
1009 } else if (*this_sym == '-') { \
1010 if (sym->st_shndx != SHN_UNDEF) \
1011 goto skip_this_sym##B; \
1012 ++this_sym; \
1013 } \
1014 /* ok, lets compare the name now */ \
1015 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
1016 (strncmp(symname, versioned_symname, strlen(versioned_symname)) == 0)) { \
1017 if (be_semi_verbose) { \
1018 char buf[126]; \
1019 snprintf(buf, sizeof(buf), "%lX %s %s", \
1020 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
1021 ret = buf; \
1022 } else \
1023 ret = this_sym; \
1024 (*found_sym)++; \
1025 goto break_out; \
1026 } \
1027 skip_this_sym##B: this_sym = next_sym + 1; \
1028 } while (*next_sym != '\0'); \
1029 } \
1030 } \ 1202 } \
1031 ++sym; \ 1203 ++sym; \
1032 } } 1204 } }
1033 FIND_SYM(32) 1205 FIND_SYM(32)
1034 FIND_SYM(64) 1206 FIND_SYM(64)
1040 if (*find_sym != '*' && *found_sym) 1212 if (*find_sym != '*' && *found_sym)
1041 return ret; 1213 return ret;
1042 if (be_quiet) 1214 if (be_quiet)
1043 return NULL; 1215 return NULL;
1044 else 1216 else
1045 return (char *)" - "; 1217 return " - ";
1046} 1218}
1047 1219
1048
1049static char *scanelf_file_sections(elfobj *elf, char *found_section) 1220static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1050{ 1221{
1051 if (!find_section) 1222 if (!find_section)
1052 return NULL; 1223 return NULL;
1053 1224
1054#define FIND_SECTION(B) \ 1225#define FIND_SECTION(B) \
1055 if (elf->elf_class == ELFCLASS ## B) { \ 1226 if (elf->elf_class == ELFCLASS ## B) { \
1227 size_t matched, n; \
1056 int invert; \ 1228 int invert; \
1229 const char *section_name; \
1057 Elf ## B ## _Shdr *section; \ 1230 Elf ## B ## _Shdr *section; \
1231 \
1232 matched = 0; \
1233 array_for_each(find_section_arr, n, section_name) { \
1058 invert = (*find_section == '!' ? 1 : 0); \ 1234 invert = (*section_name == '!' ? 1 : 0); \
1059 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \ 1235 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1060 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)) \
1061 *found_section = 1; \ 1241 *found_section = 1; \
1062 } 1242 }
1063 FIND_SECTION(32) 1243 FIND_SECTION(32)
1064 FIND_SECTION(64) 1244 FIND_SECTION(64)
1065 1245
1070 return find_section; 1250 return find_section;
1071 1251
1072 if (be_quiet) 1252 if (be_quiet)
1073 return NULL; 1253 return NULL;
1074 else 1254 else
1075 return (char *)" - "; 1255 return " - ";
1076} 1256}
1077 1257
1078/* scan an elf file and show all the fun stuff */ 1258/* scan an elf file and show all the fun stuff */
1079#define prints(str) write(fileno(stdout), str, strlen(str)) 1259#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1080static int scanelf_elfobj(elfobj *elf) 1260static int scanelf_elfobj(elfobj *elf)
1081{ 1261{
1082 unsigned long i; 1262 unsigned long i;
1083 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1263 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1084 found_rpath, found_needed, found_interp, found_bind, found_soname, 1264 found_rpath, found_needed, found_interp, found_bind, found_soname,
1085 found_sym, found_lib, found_file, found_textrels, found_section; 1265 found_sym, found_lib, found_file, found_textrels, found_section;
1086 static char *out_buffer = NULL; 1266 static char *out_buffer = NULL;
1087 static size_t out_len; 1267 static size_t out_len;
1088 1268
1089 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1269 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1098 printf("%s: scanning file\n", elf->filename); 1278 printf("%s: scanning file\n", elf->filename);
1099 1279
1100 /* init output buffer */ 1280 /* init output buffer */
1101 if (!out_buffer) { 1281 if (!out_buffer) {
1102 out_len = sizeof(char) * 80; 1282 out_len = sizeof(char) * 80;
1103 out_buffer = (char*)xmalloc(out_len); 1283 out_buffer = xmalloc(out_len);
1104 } 1284 }
1105 *out_buffer = '\0'; 1285 *out_buffer = '\0';
1106 1286
1107 /* show the header */ 1287 /* show the header */
1108 if (!be_quiet && show_banner) { 1288 if (!be_quiet && show_banner) {
1119 case 'o': prints(" TYPE "); break; 1299 case 'o': prints(" TYPE "); break;
1120 case 'x': prints(" PAX "); break; 1300 case 'x': prints(" PAX "); break;
1121 case 'e': prints("STK/REL/PTL "); break; 1301 case 'e': prints("STK/REL/PTL "); break;
1122 case 't': prints("TEXTREL "); break; 1302 case 't': prints("TEXTREL "); break;
1123 case 'r': prints("RPATH "); break; 1303 case 'r': prints("RPATH "); break;
1304 case 'M': prints("CLASS "); break;
1124 case 'n': prints("NEEDED "); break; 1305 case 'n': prints("NEEDED "); break;
1125 case 'i': prints("INTERP "); break; 1306 case 'i': prints("INTERP "); break;
1126 case 'b': prints("BIND "); break; 1307 case 'b': prints("BIND "); break;
1308 case 'Z': prints("SIZE "); break;
1127 case 'S': prints("SONAME "); break; 1309 case 'S': prints("SONAME "); break;
1128 case 's': prints("SYM "); break; 1310 case 's': prints("SYM "); break;
1129 case 'N': prints("LIB "); break; 1311 case 'N': prints("LIB "); break;
1130 case 'T': prints("TEXTRELS "); break; 1312 case 'T': prints("TEXTRELS "); break;
1131 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;
1132 default: warnf("'%c' has no title ?", out_format[i]); 1319 default: warnf("'%c' has no title ?", out_format[i]);
1133 } 1320 }
1134 } 1321 }
1135 if (!found_file) prints("FILE "); 1322 if (!found_file) prints("FILE ");
1136 prints("\n"); 1323 prints("\n");
1140 1327
1141 /* dump all the good stuff */ 1328 /* dump all the good stuff */
1142 for (i = 0; out_format[i]; ++i) { 1329 for (i = 0; out_format[i]; ++i) {
1143 const char *out; 1330 const char *out;
1144 const char *tmp; 1331 const char *tmp;
1145 1332 static char ubuf[sizeof(unsigned long)*2];
1146 if (!IS_MODIFIER(out_format[i])) { 1333 if (!IS_MODIFIER(out_format[i])) {
1147 xchrcat(&out_buffer, out_format[i], &out_len); 1334 xchrcat(&out_buffer, out_format[i], &out_len);
1148 continue; 1335 continue;
1149 } 1336 }
1150 1337
1186 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1373 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1187 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;
1188 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1375 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1189 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;
1190 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;
1191 case 'n': 1381 case 'n':
1192 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;
1193 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1383 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1194 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1384 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1195 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1385 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1196 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1386 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1197 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;;
1198 default: warnf("'%c' has no scan code?", out_format[i]); 1392 default: warnf("'%c' has no scan code?", out_format[i]);
1199 } 1393 }
1200 if (out) { 1394 if (out)
1201 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1202 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1203 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1204 else
1205 xstrcat(&out_buffer, out, &out_len); 1395 xstrcat(&out_buffer, out, &out_len);
1206 }
1207 } 1396 }
1208 1397
1209#define FOUND_SOMETHING() \ 1398#define FOUND_SOMETHING() \
1210 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1399 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1211 found_rpath || found_needed || found_interp || found_bind || \ 1400 found_rpath || found_needed || found_interp || found_bind || \
1243 if (elf->elf_class != ELFCLASS64) 1432 if (elf->elf_class != ELFCLASS64)
1244 goto label_done; 1433 goto label_done;
1245 break; 1434 break;
1246 default: break; 1435 default: break;
1247 } 1436 }
1248 if (strlen(match_etypes)) { 1437 if (match_etypes) {
1249 char sbuf[126]; 1438 char sbuf[126];
1250 strncpy(sbuf, match_etypes, sizeof(sbuf)); 1439 strncpy(sbuf, match_etypes, sizeof(sbuf));
1251 if (strchr(match_etypes, ',') != NULL) { 1440 if (strchr(match_etypes, ',') != NULL) {
1252 char *p; 1441 char *p;
1253 while((p = strrchr(sbuf, ',')) != NULL) { 1442 while ((p = strrchr(sbuf, ',')) != NULL) {
1254 *p = 0; 1443 *p = 0;
1255 if (etype_lookup(p+1) == get_etype(elf)) 1444 if (etype_lookup(p+1) == get_etype(elf))
1256 goto label_ret; 1445 goto label_ret;
1257 } 1446 }
1258 } 1447 }
1278 1467
1279 ar = ar_open_fd(filename, fd); 1468 ar = ar_open_fd(filename, fd);
1280 if (ar == NULL) 1469 if (ar == NULL)
1281 return 1; 1470 return 1;
1282 1471
1283 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);
1284 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");
1285 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);
1286 if (elf) { 1478 if (elf) {
1287 scanelf_elfobj(elf); 1479 scanelf_elfobj(elf);
1288 unreadelf(elf); 1480 unreadelf(elf);
1289 } 1481 }
1290 } 1482 }
1291 munmap(ar_buffer, len); 1483 munmap(ar_buffer, len);
1292 1484
1293 return 0; 1485 return 0;
1294} 1486}
1295/* 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 */
1296static void scanelf_file(const char *filename) 1488static int scanelf_file(const char *filename, const struct stat *st_cache)
1297{ 1489{
1490 const struct stat *st = st_cache;
1298 struct stat st; 1491 struct stat symlink_st;
1299 int fd; 1492 int fd;
1300 1493
1301 /* make sure 'filename' exists */
1302 if (lstat(filename, &st) == -1) {
1303 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1304 return;
1305 }
1306
1307 /* always handle regular files and handle symlinked files if no -y */ 1494 /* always handle regular files and handle symlinked files if no -y */
1308 if (S_ISLNK(st.st_mode)) { 1495 if (S_ISLNK(st->st_mode)) {
1309 if (!scan_symlink) return; 1496 if (!scan_symlink) return 1;
1310 stat(filename, &st); 1497 stat(filename, &symlink_st);
1498 st = &symlink_st;
1311 } 1499 }
1500
1312 if (!S_ISREG(st.st_mode)) { 1501 if (!S_ISREG(st->st_mode)) {
1313 if (be_verbose > 2) printf("%s: skipping non-file\n", filename); 1502 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1314 return; 1503 return 1;
1315 } 1504 }
1316 1505
1506 if (match_perms) {
1507 if ((st->st_mode | match_perms) != st->st_mode)
1508 return 1;
1509 }
1317 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1) 1510 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1318 return; 1511 return 1;
1319 1512
1320 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives) 1513 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1321 /* 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 */
1322 scanelf_archive(filename, fd, st.st_size); 1515 scanelf_archive(filename, fd, st->st_size);
1323 1516
1324 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;
1325} 1529}
1326 1530
1327/* 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 */
1328static void scanelf_dir(const char *path) 1532static int scanelf_dir(const char *path)
1329{ 1533{
1330 register DIR *dir; 1534 register DIR *dir;
1331 register struct dirent *dentry; 1535 register struct dirent *dentry;
1332 struct stat st_top, st; 1536 struct stat st_top, st;
1333 char buf[__PAX_UTILS_PATH_MAX]; 1537 char buf[__PAX_UTILS_PATH_MAX];
1538 char _path[__PAX_UTILS_PATH_MAX];
1334 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);
1335 1543
1336 /* make sure path exists */ 1544 /* make sure path exists */
1337 if (lstat(path, &st_top) == -1) { 1545 if (lstat(path, &st_top) == -1) {
1338 if (be_verbose > 2) printf("%s: does not exist\n", path); 1546 if (be_verbose > 2) printf("%s: does not exist\n", path);
1339 return; 1547 return 1;
1340 } 1548 }
1341 1549
1342 /* 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 */
1343 if (!S_ISDIR(st_top.st_mode)) { 1551 if (!S_ISDIR(st_top.st_mode)) {
1344 scanelf_file(path); 1552 return scanelf_file(path, &st_top);
1345 return;
1346 } 1553 }
1347 1554
1348 /* now scan the dir looking for fun stuff */ 1555 /* now scan the dir looking for fun stuff */
1349 if ((dir = opendir(path)) == NULL) { 1556 if ((dir = opendir(path)) == NULL) {
1350 warnf("could not opendir %s: %s", path, strerror(errno)); 1557 warnf("could not opendir %s: %s", path, strerror(errno));
1351 return; 1558 return 1;
1352 } 1559 }
1353 if (be_verbose > 1) printf("%s: scanning dir\n", path); 1560 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1354 1561
1355 pathlen = strlen(path); 1562 pathlen = strlen(path);
1356 while ((dentry = readdir(dir))) { 1563 while ((dentry = readdir(dir))) {
1363 continue; 1570 continue;
1364 } 1571 }
1365 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);
1366 if (lstat(buf, &st) != -1) { 1573 if (lstat(buf, &st) != -1) {
1367 if (S_ISREG(st.st_mode)) 1574 if (S_ISREG(st.st_mode))
1368 scanelf_file(buf); 1575 ret = scanelf_file(buf, &st);
1369 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1576 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1370 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1577 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1371 scanelf_dir(buf); 1578 ret = scanelf_dir(buf);
1372 } 1579 }
1373 } 1580 }
1374 } 1581 }
1375 closedir(dir); 1582 closedir(dir);
1583 return ret;
1376} 1584}
1377 1585
1378static int scanelf_from_file(const char *filename) 1586static int scanelf_from_file(const char *filename)
1379{ 1587{
1380 FILE *fp = NULL; 1588 FILE *fp = NULL;
1381 char *p; 1589 char *p;
1382 char path[__PAX_UTILS_PATH_MAX]; 1590 char path[__PAX_UTILS_PATH_MAX];
1591 int ret = 0;
1383 1592
1384 if (strcmp(filename, "-") == 0) 1593 if (strcmp(filename, "-") == 0)
1385 fp = stdin; 1594 fp = stdin;
1386 else if ((fp = fopen(filename, "r")) == NULL) 1595 else if ((fp = fopen(filename, "r")) == NULL)
1387 return 1; 1596 return 1;
1388 1597
1389 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1598 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1390 if ((p = strchr(path, '\n')) != NULL) 1599 if ((p = strchr(path, '\n')) != NULL)
1391 *p = 0; 1600 *p = 0;
1392 search_path = path; 1601 search_path = path;
1393 scanelf_dir(path); 1602 ret = scanelf_dir(path);
1394 } 1603 }
1395 if (fp != stdin) 1604 if (fp != stdin)
1396 fclose(fp); 1605 fclose(fp);
1397 return 0; 1606 return ret;
1398} 1607}
1399 1608
1400#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__) 1609#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1401 1610
1402static int load_ld_cache_config(int i, const char *fname) 1611static int load_ld_cache_config(int i, const char *fname)
1403{ 1612{
1404 FILE *fp = NULL; 1613 FILE *fp = NULL;
1405 char *p; 1614 char *p;
1406 char path[__PAX_UTILS_PATH_MAX]; 1615 char path[__PAX_UTILS_PATH_MAX];
1616 char _fname[__PAX_UTILS_PATH_MAX];
1407 1617
1408 if (i + 1 == ARRAY_SIZE(ldpaths)) 1618 fname = maybe_add_root(fname, _fname);
1409 return i;
1410 1619
1411 if ((fp = fopen(fname, "r")) == NULL) 1620 if ((fp = fopen(fname, "r")) == NULL)
1412 return i; 1621 return i;
1413 1622
1414 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1623 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1415 if ((p = strrchr(path, '\r')) != NULL) 1624 if ((p = strrchr(path, '\r')) != NULL)
1416 *p = 0; 1625 *p = 0;
1417 if ((p = strchr(path, '\n')) != NULL) 1626 if ((p = strchr(path, '\n')) != NULL)
1418 *p = 0; 1627 *p = 0;
1419#ifdef __linux__ 1628
1420 // recursive includes of the same file will make this segfault. 1629 /* recursive includes of the same file will make this segfault. */
1421 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) { 1630 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1422 glob64_t gl; 1631 glob_t gl;
1423 size_t x; 1632 size_t x;
1424 char gpath[__PAX_UTILS_PATH_MAX]; 1633 char gpath[__PAX_UTILS_PATH_MAX];
1425 1634
1426 memset(gpath, 0, sizeof(gpath)); 1635 memset(gpath, 0, sizeof(gpath));
1636 if (root)
1637 strcpy(gpath, root);
1427 1638
1428 if (path[8] != '/') 1639 if (path[8] != '/')
1429 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]); 1640 snprintf(gpath+strlen(gpath), sizeof(gpath)-strlen(gpath), "/etc/%s", &path[8]);
1430 else 1641 else
1431 strncpy(gpath, &path[8], sizeof(gpath)); 1642 strncpy(gpath+strlen(gpath), &path[8], sizeof(gpath)-strlen(gpath));
1432 1643
1433 if ((glob64(gpath, 0, NULL, &gl)) == 0) { 1644 if (glob(gpath, 0, NULL, &gl) == 0) {
1434 for (x = 0; x < gl.gl_pathc; ++x) { 1645 for (x = 0; x < gl.gl_pathc; ++x) {
1435 /* try to avoid direct loops */ 1646 /* try to avoid direct loops */
1436 if (strcmp(gl.gl_pathv[x], fname) == 0) 1647 if (strcmp(gl.gl_pathv[x], fname) == 0)
1437 continue; 1648 continue;
1438 i = load_ld_cache_config(i, gl.gl_pathv[x]); 1649 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1439 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1440 globfree64(&gl);
1441 return i;
1442 }
1443 } 1650 }
1444 globfree64 (&gl); 1651 globfree(&gl);
1445 continue; 1652 continue;
1446 } else
1447 abort();
1448 } 1653 }
1449#endif 1654 }
1655
1450 if (*path != '/') 1656 if (*path != '/')
1451 continue; 1657 continue;
1452 1658
1453 ldpaths[i++] = xstrdup(path); 1659 xarraypush(ldpaths, path, strlen(path));
1454
1455 if (i + 1 == ARRAY_SIZE(ldpaths))
1456 break;
1457 } 1660 }
1458 ldpaths[i] = NULL;
1459 1661
1460 fclose(fp); 1662 fclose(fp);
1461 return i; 1663 return i;
1462} 1664}
1463 1665
1464#elif defined(__FreeBSD__) || (__DragonFly__) 1666#elif defined(__FreeBSD__) || defined(__DragonFly__)
1465 1667
1466static int load_ld_cache_config(int i, const char *fname) 1668static int load_ld_cache_config(int i, const char *fname)
1467{ 1669{
1468 FILE *fp = NULL; 1670 FILE *fp = NULL;
1469 char *b = NULL, *p; 1671 char *b = NULL, *p;
1470 struct elfhints_hdr hdr; 1672 struct elfhints_hdr hdr;
1673 char _fname[__PAX_UTILS_PATH_MAX];
1471 1674
1472 if (i + 1 == ARRAY_SIZE(ldpaths)) 1675 fname = maybe_add_root(fname, _fname);
1473 return i;
1474 1676
1475 if ((fp = fopen(fname, "r")) == NULL) 1677 if ((fp = fopen(fname, "r")) == NULL)
1476 return i; 1678 return i;
1477 1679
1478 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) || 1680 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1481 { 1683 {
1482 fclose(fp); 1684 fclose(fp);
1483 return i; 1685 return i;
1484 } 1686 }
1485 1687
1486 b = (char*)malloc(hdr.dirlistlen+1); 1688 b = xmalloc(hdr.dirlistlen + 1);
1487 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) { 1689 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1488 fclose(fp); 1690 fclose(fp);
1489 free(b); 1691 free(b);
1490 return i; 1692 return i;
1491 } 1693 }
1492 1694
1493 while ((p = strsep(&b, ":"))) { 1695 while ((p = strsep(&b, ":"))) {
1494 if (*p == '\0') continue; 1696 if (*p == '\0')
1495 ldpaths[i++] = xstrdup(p); 1697 continue;
1496 1698 xarraypush(ldpaths, p, strlen(p));
1497 if (i + 1 == ARRAY_SIZE(ldpaths))
1498 break;
1499 } 1699 }
1500 ldpaths[i] = NULL; 1700
1501
1502 free(b); 1701 free(b);
1503 fclose(fp); 1702 fclose(fp);
1504 return i; 1703 return i;
1505} 1704}
1506 1705
1507#else 1706#else
1508 1707#ifdef __ELF__
1509#warning Cache config support not implemented for your target 1708#warning Cache config support not implemented for your target
1709#endif
1510static int load_ld_cache_config(int i, const char *fname) 1710static int load_ld_cache_config(int i, const char *fname)
1511{ 1711{
1512 memset(ldpaths, 0x00, sizeof(ldpaths)); 1712 return 0;
1513} 1713}
1514
1515#endif 1714#endif
1516 1715
1517/* scan /etc/ld.so.conf for paths */ 1716/* scan /etc/ld.so.conf for paths */
1518static void scanelf_ldpath() 1717static void scanelf_ldpath(void)
1519{ 1718{
1520 char scan_l, scan_ul, scan_ull; 1719 char scan_l, scan_ul, scan_ull;
1720 size_t n;
1721 const char *ldpath;
1521 int i = 0; 1722 int i = 0;
1522 1723
1523 if (!ldpaths[0]) 1724 if (array_cnt(ldpaths) == 0)
1524 err("Unable to load any paths from ld.so.conf"); 1725 err("Unable to load any paths from ld.so.conf");
1525 1726
1526 scan_l = scan_ul = scan_ull = 0; 1727 scan_l = scan_ul = scan_ull = 0;
1527 1728
1528 while (ldpaths[i]) { 1729 array_for_each(ldpaths, n, ldpath) {
1529 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1; 1730 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = 1;
1530 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1; 1731 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = 1;
1531 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1; 1732 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = 1;
1532 scanelf_dir(ldpaths[i]); 1733 scanelf_dir(ldpath);
1533 ++i; 1734 ++i;
1534 } 1735 }
1535 1736
1536 if (!scan_l) scanelf_dir("/lib"); 1737 if (!scan_l) scanelf_dir("/lib");
1537 if (!scan_ul) scanelf_dir("/usr/lib"); 1738 if (!scan_ul) scanelf_dir("/usr/lib");
1538 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1739 if (!scan_ull) scanelf_dir("/usr/local/lib");
1539} 1740}
1540 1741
1541/* scan env PATH for paths */ 1742/* scan env PATH for paths */
1542static void scanelf_envpath() 1743static void scanelf_envpath(void)
1543{ 1744{
1544 char *path, *p; 1745 char *path, *p;
1545 1746
1546 path = getenv("PATH"); 1747 path = getenv("PATH");
1547 if (!path) 1748 if (!path)
1554 } 1755 }
1555 1756
1556 free(path); 1757 free(path);
1557} 1758}
1558 1759
1559/* usage / invocation handling functions */ 1760/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1560#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"
1561#define a_argument required_argument 1762#define a_argument required_argument
1562static struct option const long_opts[] = { 1763static struct option const long_opts[] = {
1563 {"path", no_argument, NULL, 'p'}, 1764 {"path", no_argument, NULL, 'p'},
1564 {"ldpath", no_argument, NULL, 'l'}, 1765 {"ldpath", no_argument, NULL, 'l'},
1766 {"root", a_argument, NULL, 128},
1565 {"recursive", no_argument, NULL, 'R'}, 1767 {"recursive", no_argument, NULL, 'R'},
1566 {"mount", no_argument, NULL, 'm'}, 1768 {"mount", no_argument, NULL, 'm'},
1567 {"symlink", no_argument, NULL, 'y'}, 1769 {"symlink", no_argument, NULL, 'y'},
1568 {"archives", no_argument, NULL, 'A'}, 1770 {"archives", no_argument, NULL, 'A'},
1569 {"ldcache", no_argument, NULL, 'L'}, 1771 {"ldcache", no_argument, NULL, 'L'},
1582 {"lib", a_argument, NULL, 'N'}, 1784 {"lib", a_argument, NULL, 'N'},
1583 {"gmatch", no_argument, NULL, 'g'}, 1785 {"gmatch", no_argument, NULL, 'g'},
1584 {"textrels", no_argument, NULL, 'T'}, 1786 {"textrels", no_argument, NULL, 'T'},
1585 {"etype", a_argument, NULL, 'E'}, 1787 {"etype", a_argument, NULL, 'E'},
1586 {"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'},
1587 {"all", no_argument, NULL, 'a'}, 1794 {"all", no_argument, NULL, 'a'},
1588 {"quiet", no_argument, NULL, 'q'}, 1795 {"quiet", no_argument, NULL, 'q'},
1589 {"verbose", no_argument, NULL, 'v'}, 1796 {"verbose", no_argument, NULL, 'v'},
1590 {"format", a_argument, NULL, 'F'}, 1797 {"format", a_argument, NULL, 'F'},
1591 {"from", a_argument, NULL, 'f'}, 1798 {"from", a_argument, NULL, 'f'},
1592 {"file", a_argument, NULL, 'o'}, 1799 {"file", a_argument, NULL, 'o'},
1800 {"nocolor", no_argument, NULL, 'C'},
1593 {"nobanner", no_argument, NULL, 'B'}, 1801 {"nobanner", no_argument, NULL, 'B'},
1594 {"help", no_argument, NULL, 'h'}, 1802 {"help", no_argument, NULL, 'h'},
1595 {"version", no_argument, NULL, 'V'}, 1803 {"version", no_argument, NULL, 'V'},
1596 {NULL, no_argument, NULL, 0x0} 1804 {NULL, no_argument, NULL, 0x0}
1597}; 1805};
1598 1806
1599static const char *opts_help[] = { 1807static const char * const opts_help[] = {
1600 "Scan all directories in PATH environment", 1808 "Scan all directories in PATH environment",
1601 "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)",
1602 "Scan directories recursively", 1811 "Scan directories recursively",
1603 "Don't recursively cross mount points", 1812 "Don't recursively cross mount points",
1604 "Don't scan symlinks", 1813 "Don't scan symlinks",
1605 "Scan archives (.a files)", 1814 "Scan archives (.a files)",
1606 "Utilize ld.so.cache information (use with -r/-n)", 1815 "Utilize ld.so.cache information (use with -r/-n)",
1615 "Print BIND information", 1824 "Print BIND information",
1616 "Print SONAME information", 1825 "Print SONAME information",
1617 "Find a specified symbol", 1826 "Find a specified symbol",
1618 "Find a specified section", 1827 "Find a specified section",
1619 "Find a specified library", 1828 "Find a specified library",
1620 "Use strncmp to match libraries. (use with -N)", 1829 "Use regex matching rather than string compare (use with -s)",
1621 "Locate cause of TEXTREL", 1830 "Locate cause of TEXTREL",
1622 "Print only ELF files matching etype ET_DYN,ET_EXEC ...", 1831 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1623 "Print only ELF files matching numeric bits", 1832 "Print only ELF files matching numeric bits",
1624 "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",
1625 "Only output 'bad' things", 1839 "Only output 'bad' things",
1626 "Be verbose (can be specified more than once)", 1840 "Be verbose (can be specified more than once)",
1627 "Use specified format for output", 1841 "Use specified format for output",
1628 "Read input stream from a filename", 1842 "Read input stream from a filename",
1629 "Write output stream to a filename", 1843 "Write output stream to a filename",
1844 "Don't emit color in output",
1630 "Don't display the header", 1845 "Don't display the header",
1631 "Print this help and exit", 1846 "Print this help and exit",
1632 "Print version and exit", 1847 "Print version and exit",
1633 NULL 1848 NULL
1634}; 1849};
1640 printf("* Scan ELF binaries for stuff\n\n" 1855 printf("* Scan ELF binaries for stuff\n\n"
1641 "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);
1642 printf("Options: -[%s]\n", PARSE_FLAGS); 1857 printf("Options: -[%s]\n", PARSE_FLAGS);
1643 for (i = 0; long_opts[i].name; ++i) 1858 for (i = 0; long_opts[i].name; ++i)
1644 if (long_opts[i].has_arg == no_argument) 1859 if (long_opts[i].has_arg == no_argument)
1645 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",
1646 long_opts[i].name, opts_help[i]); 1864 long_opts[i].name, opts_help[i]);
1647 else 1865 else
1648 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val, 1866 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1649 long_opts[i].name, opts_help[i]); 1867 long_opts[i].name, opts_help[i]);
1650 1868
1651 if (status != EXIT_SUCCESS) 1869 puts("\nFor more information, see the scanelf(1) manpage");
1652 exit(status);
1653
1654 puts("\nThe format modifiers for the -F option are:");
1655 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1656 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1657 puts(" i INTERP \tb BIND \ts symbol");
1658 puts(" N library \to Type \tT TEXTRELs");
1659 puts(" S SONAME \tk section");
1660 puts(" p filename (with search path removed)");
1661 puts(" f filename (short name/basename)");
1662 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1663
1664 puts("\nELF Etypes:");
1665 print_etypes(stdout);
1666
1667 exit(status); 1870 exit(status);
1668} 1871}
1669 1872
1670/* 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 }
1671static void parseargs(int argc, char *argv[]) 1882static int parseargs(int argc, char *argv[])
1672{ 1883{
1673 int i; 1884 int i;
1674 const char *from_file = NULL; 1885 const char *from_file = NULL;
1886 int ret = 0;
1675 1887
1676 opterr = 0; 1888 opterr = 0;
1677 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) {
1678 switch (i) { 1890 switch (i) {
1679 1891
1687 case 'f': 1899 case 'f':
1688 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");
1689 from_file = optarg; 1901 from_file = optarg;
1690 break; 1902 break;
1691 case 'E': 1903 case 'E':
1692 strncpy(match_etypes, optarg, sizeof(match_etypes)); 1904 match_etypes = optarg;
1693 break; 1905 break;
1694 case 'M': 1906 case 'M':
1695 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;
1696 break; 1918 break;
1697 case 'o': { 1919 case 'o': {
1698 if (freopen(optarg, "w", stdout) == NULL) 1920 if (freopen(optarg, "w", stdout) == NULL)
1699 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1921 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1700 break; 1922 break;
1701 } 1923 }
1702 case 'k': 1924 case 'k':
1703 if (find_section) warn("You prob don't want to specify -k twice"); 1925 xarraypush(find_section_arr, optarg, strlen(optarg));
1704 find_section = optarg;
1705 break; 1926 break;
1706 case 's': { 1927 case 's': {
1707 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");
1708 find_sym = optarg; 1929 find_sym = optarg;
1709 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1710 sprintf(versioned_symname, "%s@", find_sym);
1711 break; 1930 break;
1712 } 1931 }
1713 case 'N': { 1932 case 'N':
1714 if (find_lib) warn("You prob don't want to specify -N twice"); 1933 xarraypush(find_lib_arr, optarg, strlen(optarg));
1715 find_lib = optarg;
1716 break; 1934 break;
1717 }
1718
1719 case 'F': { 1935 case 'F': {
1720 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");
1721 out_format = optarg; 1937 out_format = optarg;
1722 break; 1938 break;
1723 } 1939 }
1724 case 'z': { 1940 case 'z': {
1725 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC); 1941 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1726 size_t x; 1942 size_t x;
1727 1943
1728 for (x = 0 ; x < strlen(optarg); x++) { 1944 for (x = 0; x < strlen(optarg); x++) {
1729 switch(optarg[x]) { 1945 switch (optarg[x]) {
1730 case 'p': 1946 case 'p':
1731 case 'P': 1947 case 'P':
1732 do_state(optarg[x], PAGEEXEC); 1948 do_pax_state(optarg[x], PAGEEXEC);
1733 break; 1949 break;
1734 case 's': 1950 case 's':
1735 case 'S': 1951 case 'S':
1736 do_state(optarg[x], SEGMEXEC); 1952 do_pax_state(optarg[x], SEGMEXEC);
1737 break; 1953 break;
1738 case 'm': 1954 case 'm':
1739 case 'M': 1955 case 'M':
1740 do_state(optarg[x], MPROTECT); 1956 do_pax_state(optarg[x], MPROTECT);
1741 break; 1957 break;
1742 case 'e': 1958 case 'e':
1743 case 'E': 1959 case 'E':
1744 do_state(optarg[x], EMUTRAMP); 1960 do_pax_state(optarg[x], EMUTRAMP);
1745 break; 1961 break;
1746 case 'r': 1962 case 'r':
1747 case 'R': 1963 case 'R':
1748 do_state(optarg[x], RANDMMAP); 1964 do_pax_state(optarg[x], RANDMMAP);
1749 break; 1965 break;
1750 case 'x': 1966 case 'x':
1751 case 'X': 1967 case 'X':
1752 do_state(optarg[x], RANDEXEC); 1968 do_pax_state(optarg[x], RANDEXEC);
1753 break; 1969 break;
1754 default: 1970 default:
1755 break; 1971 break;
1756 } 1972 }
1757 } 1973 }
1762 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) || 1978 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1763 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)))) 1979 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1764 setpax = flags; 1980 setpax = flags;
1765 break; 1981 break;
1766 } 1982 }
1983 case 'Z': show_size = 1; break;
1767 case 'g': gmatch = 1; break; 1984 case 'g': g_match = 1; break;
1768 case 'L': use_ldcache = 1; break; 1985 case 'L': use_ldcache = 1; break;
1769 case 'y': scan_symlink = 0; break; 1986 case 'y': scan_symlink = 0; break;
1770 case 'A': scan_archives = 1; break; 1987 case 'A': scan_archives = 1; break;
1988 case 'C': color_init(true); break;
1771 case 'B': show_banner = 0; break; 1989 case 'B': show_banner = 0; break;
1772 case 'l': scan_ldpath = 1; break; 1990 case 'l': scan_ldpath = 1; break;
1773 case 'p': scan_envpath = 1; break; 1991 case 'p': scan_envpath = 1; break;
1774 case 'R': dir_recurse = 1; break; 1992 case 'R': dir_recurse = 1; break;
1775 case 'm': dir_crossmount = 0; break; 1993 case 'm': dir_crossmount = 0; break;
1783 case 'b': show_bind = 1; break; 2001 case 'b': show_bind = 1; break;
1784 case 'S': show_soname = 1; break; 2002 case 'S': show_soname = 1; break;
1785 case 'T': show_textrels = 1; break; 2003 case 'T': show_textrels = 1; break;
1786 case 'q': be_quiet = 1; break; 2004 case 'q': be_quiet = 1; break;
1787 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2005 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1788 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;
1789 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;
1790 case ':': 2013 case ':':
1791 err("Option '%c' is missing parameter", optopt); 2014 err("Option '%c' is missing parameter", optopt);
1792 case '?': 2015 case '?':
1793 err("Unknown option '%c' or argument missing", optopt); 2016 err("Unknown option '%c' or argument missing", optopt);
1794 default: 2017 default:
1795 err("Unhandled option '%c'; please report this", i); 2018 err("Unhandled option '%c'; please report this", i);
1796 } 2019 }
1797 } 2020 }
1798 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);
1799 /* let the format option override all other options */ 2030 /* let the format option override all other options */
1800 if (out_format) { 2031 if (out_format) {
1801 show_pax = show_phdr = show_textrel = show_rpath = \ 2032 show_pax = show_phdr = show_textrel = show_rpath = \
1802 show_needed = show_interp = show_bind = show_soname = \ 2033 show_needed = show_interp = show_bind = show_soname = \
1803 show_textrels = 0; 2034 show_textrels = show_perms = show_endian = show_size = \
2035 show_osabi = show_eabi = 0;
1804 for (i = 0; out_format[i]; ++i) { 2036 for (i = 0; out_format[i]; ++i) {
1805 if (!IS_MODIFIER(out_format[i])) continue; 2037 if (!IS_MODIFIER(out_format[i])) continue;
1806 2038
1807 switch (out_format[++i]) { 2039 switch (out_format[++i]) {
1808 case '+': break; 2040 case '+': break;
1813 case 'f': break; 2045 case 'f': break;
1814 case 'k': break; 2046 case 'k': break;
1815 case 's': break; 2047 case 's': break;
1816 case 'N': break; 2048 case 'N': break;
1817 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;
1818 case 'x': show_pax = 1; break; 2057 case 'x': show_pax = 1; break;
1819 case 'e': show_phdr = 1; break; 2058 case 'e': show_phdr = 1; break;
1820 case 't': show_textrel = 1; break; 2059 case 't': show_textrel = 1; break;
1821 case 'r': show_rpath = 1; break; 2060 case 'r': show_rpath = 1; break;
1822 case 'n': show_needed = 1; break; 2061 case 'n': show_needed = 1; break;
1823 case 'i': show_interp = 1; break; 2062 case 'i': show_interp = 1; break;
1824 case 'b': show_bind = 1; break; 2063 case 'b': show_bind = 1; break;
1825 case 'S': show_soname = 1; break; 2064 case 'S': show_soname = 1; break;
1826 case 'T': show_textrels = 1; break; 2065 case 'T': show_textrels = 1; break;
1827 default: 2066 default:
1828 err("Invalid format specifier '%c' (byte %i)", 2067 err("Invalid format specifier '%c' (byte %i)",
1829 out_format[i], i+1); 2068 out_format[i], i+1);
1830 } 2069 }
1831 } 2070 }
1832 2071
1833 /* construct our default format */ 2072 /* construct our default format */
1834 } else { 2073 } else {
1835 size_t fmt_len = 30; 2074 size_t fmt_len = 30;
1836 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2075 out_format = xmalloc(sizeof(char) * fmt_len);
2076 *out_format = '\0';
1837 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2077 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1838 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);
1839 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2084 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1840 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2085 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1841 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2086 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1842 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2087 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1843 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2088 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1864 } 2109 }
1865 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2110 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1866 err("Nothing to scan !?"); 2111 err("Nothing to scan !?");
1867 while (optind < argc) { 2112 while (optind < argc) {
1868 search_path = argv[optind++]; 2113 search_path = argv[optind++];
1869 scanelf_dir(search_path); 2114 ret = scanelf_dir(search_path);
1870 } 2115 }
1871 2116
1872 /* clean up */ 2117 /* clean up */
1873 free(versioned_symname);
1874 for (i = 0; ldpaths[i]; ++i)
1875 free(ldpaths[i]); 2118 xarrayfree(ldpaths);
2119 xarrayfree(find_lib_arr);
2120 xarrayfree(find_section_arr);
2121 free(find_lib);
2122 free(find_section);
1876 2123
1877 if (ldcache != 0) 2124 if (ldcache != 0)
1878 munmap(ldcache, ldcache_size); 2125 munmap(ldcache, ldcache_size);
2126 return ret;
1879} 2127}
1880 2128
1881static char **get_split_env(const char *envvar) 2129static char **get_split_env(const char *envvar)
1882{ 2130{
1883 const char *delims = " \t\n"; 2131 const char *delims = " \t\n";
1909 2157
1910 /* 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
1911 * the envvals array of strings */ 2159 * the envvals array of strings */
1912 return envvals; 2160 return envvals;
1913} 2161}
2162
1914static void parseenv() 2163static void parseenv(void)
1915{ 2164{
2165 color_init(false);
1916 qa_textrels = get_split_env("QA_TEXTRELS"); 2166 qa_textrels = get_split_env("QA_TEXTRELS");
1917 qa_execstack = get_split_env("QA_EXECSTACK"); 2167 qa_execstack = get_split_env("QA_EXECSTACK");
1918 qa_wx_load = get_split_env("QA_WX_LOAD"); 2168 qa_wx_load = get_split_env("QA_WX_LOAD");
1919} 2169}
2170
1920#ifdef __PAX_UTILS_CLEANUP 2171#ifdef __PAX_UTILS_CLEANUP
1921static void cleanup() 2172static void cleanup(void)
1922{ 2173{
1923 free(out_format); 2174 free(out_format);
1924 free(qa_textrels); 2175 free(qa_textrels);
1925 free(qa_execstack); 2176 free(qa_execstack);
1926 free(qa_wx_load); 2177 free(qa_wx_load);
1927} 2178}
1928#endif 2179#endif
1929 2180
1930
1931
1932int main(int argc, char *argv[]) 2181int main(int argc, char *argv[])
1933{ 2182{
2183 int ret;
1934 if (argc < 2) 2184 if (argc < 2)
1935 usage(EXIT_FAILURE); 2185 usage(EXIT_FAILURE);
1936 parseenv(); 2186 parseenv();
1937 parseargs(argc, argv); 2187 ret = parseargs(argc, argv);
1938 fclose(stdout); 2188 fclose(stdout);
1939#ifdef __PAX_UTILS_CLEANUP 2189#ifdef __PAX_UTILS_CLEANUP
1940 cleanup(); 2190 cleanup();
1941 warn("The calls to add/delete heap should be off:\n" 2191 warn("The calls to add/delete heap should be off:\n"
1942 "\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"
1943 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD"); 2193 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1944#endif 2194#endif
1945 return EXIT_SUCCESS; 2195 return ret;
1946} 2196}
2197
2198/* Match filename against entries in matchlist, return TRUE
2199 * if the file is listed */
2200static int file_matches_list(const char *filename, char **matchlist)
2201{
2202 char **file;
2203 char *match;
2204 char buf[__PAX_UTILS_PATH_MAX];
2205
2206 if (matchlist == NULL)
2207 return 0;
2208
2209 for (file = matchlist; *file != NULL; file++) {
2210 if (search_path) {
2211 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2212 match = buf;
2213 } else {
2214 match = *file;
2215 }
2216 if (fnmatch(match, filename, 0) == 0)
2217 return 1;
2218 }
2219 return 0;
2220}

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