/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.119 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 1.119 2006/02/05 02:25:58 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 1.119 2006/02/05 02:25:58 solar Exp $";
13#define argv0 "scanelf"
14
15#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
16
17
18 16
19/* prototypes */ 17/* prototypes */
20static int scanelf_elfobj(elfobj *elf); 18static int file_matches_list(const char *filename, char **matchlist);
21static int scanelf_elf(const char *filename, int fd, size_t len);
22static int scanelf_archive(const char *filename, int fd, size_t len);
23static void scanelf_file(const char *filename);
24static void scanelf_dir(const char *path);
25static void scanelf_ldpath(void);
26static void scanelf_envpath(void);
27static void usage(int status);
28static void parseargs(int argc, char *argv[]);
29static char *xstrdup(const char *s);
30static void *xmalloc(size_t size);
31static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
32#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
33static inline void xchrcat(char **dst, const char append, size_t *curr_len);
34 19
35/* variables to control behavior */ 20/* variables to control behavior */
36static char match_etypes[126] = ""; 21static char *match_etypes = NULL;
37static char *ldpaths[256]; 22static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
38static char scan_ldpath = 0; 23static char scan_ldpath = 0;
39static char scan_envpath = 0; 24static char scan_envpath = 0;
40static char scan_symlink = 1; 25static char scan_symlink = 1;
41static char scan_archives = 0; 26static char scan_archives = 0;
42static char dir_recurse = 0; 27static char dir_recurse = 0;
43static char dir_crossmount = 1; 28static char dir_crossmount = 1;
44static char show_pax = 0; 29static char show_pax = 0;
30static char show_perms = 0;
31static char show_size = 0;
45static char show_phdr = 0; 32static char show_phdr = 0;
46static char show_textrel = 0; 33static char show_textrel = 0;
47static char show_rpath = 0; 34static char show_rpath = 0;
48static char show_needed = 0; 35static char show_needed = 0;
49static char show_interp = 0; 36static char show_interp = 0;
50static char show_bind = 0; 37static char show_bind = 0;
51static char show_soname = 0; 38static char show_soname = 0;
52static char show_textrels = 0; 39static char show_textrels = 0;
53static char show_banner = 1; 40static char show_banner = 1;
41static char show_endian = 0;
42static char show_osabi = 0;
43static char show_eabi = 0;
54static char be_quiet = 0; 44static char be_quiet = 0;
55static char be_verbose = 0; 45static char be_verbose = 0;
56static char be_wewy_wewy_quiet = 0; 46static char be_wewy_wewy_quiet = 0;
57static char *find_sym = NULL, *versioned_symname = NULL; 47static char be_semi_verbose = 0;
48static char *find_sym = NULL;
58static char *find_lib = NULL; 49static char *find_lib = NULL;
50static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
51static char *find_section = NULL;
52static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
59static char *out_format = NULL; 53static char *out_format = NULL;
60static char *search_path = NULL; 54static char *search_path = NULL;
61static char fix_elf = 0; 55static char fix_elf = 0;
62static char gmatch = 0; 56static char g_match = 0;
63static char use_ldcache = 0; 57static char use_ldcache = 0;
64 58
59static char **qa_textrels = NULL;
60static char **qa_execstack = NULL;
61static char **qa_wx_load = NULL;
62static char *root;
65 63
66caddr_t ldcache = 0; 64static int match_bits = 0;
65static unsigned int match_perms = 0;
66static void *ldcache = NULL;
67size_t ldcache_size = 0; 67static size_t ldcache_size = 0;
68static unsigned long setpax = 0UL;
69
70static int has_objdump = 0;
71
72/* find the path to a file by name */
73static char *which(const char *fname)
74{
75 static char fullpath[__PAX_UTILS_PATH_MAX];
76 char *path, *p;
77
78 path = getenv("PATH");
79 if (!path)
80 return NULL;
81
82 path = xstrdup(path);
83 while ((p = strrchr(path, ':')) != NULL) {
84 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
85 *p = 0;
86 if (access(fullpath, R_OK) != -1) {
87 free(path);
88 return fullpath;
89 }
90 }
91 free(path);
92 return NULL;
93}
94
95/* 1 on failure. 0 otherwise */
96static int rematch(const char *regex, const char *match, int cflags)
97{
98 regex_t preg;
99 int ret;
100
101 if ((match == NULL) || (regex == NULL))
102 return EXIT_FAILURE;
103
104 if ((ret = regcomp(&preg, regex, cflags))) {
105 char err[256];
106
107 if (regerror(ret, &preg, err, sizeof(err)))
108 fprintf(stderr, "regcomp failed: %s", err);
109 else
110 fprintf(stderr, "regcomp failed");
111
112 return EXIT_FAILURE;
113 }
114 ret = regexec(&preg, match, 0, NULL, 0);
115 regfree(&preg);
116
117 return ret;
118}
68 119
69/* sub-funcs for scanelf_file() */ 120/* sub-funcs for scanelf_file() */
70static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 121static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
71{ 122{
72 /* 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
73#define GET_SYMTABS(B) \ 132#define GET_SYMTABS(B) \
74 if (elf->elf_class == ELFCLASS ## B) { \ 133 if (elf->elf_class == ELFCLASS ## B) { \
75 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
76 /* debug sections */ \
77 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
78 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
79 /* runtime sections */ \
80 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
81 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
82 if (symtab && dynsym) { \ 134 if (symtab && dynsym) { \
135 Elf ## B ## _Shdr *esymtab = symtab; \
136 Elf ## B ## _Shdr *edynsym = dynsym; \
83 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 137 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
84 } else { \ 138 } else \
85 *sym = (void*)(symtab ? symtab : dynsym); \ 139 *sym = symtab ? symtab : dynsym; \
86 } \
87 if (strtab && dynstr) { \ 140 if (strtab && dynstr) { \
141 Elf ## B ## _Shdr *estrtab = strtab; \
142 Elf ## B ## _Shdr *edynstr = dynstr; \
88 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ 143 *tab = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
89 } else { \ 144 } else \
90 *tab = (void*)(strtab ? strtab : dynstr); \ 145 *tab = strtab ? strtab : dynstr; \
91 } \
92 } 146 }
93 GET_SYMTABS(32) 147 GET_SYMTABS(32)
94 GET_SYMTABS(64) 148 GET_SYMTABS(64)
95} 149}
150
96static char *scanelf_file_pax(elfobj *elf, char *found_pax) 151static char *scanelf_file_pax(elfobj *elf, char *found_pax)
97{ 152{
98 static char ret[7]; 153 static char ret[7];
99 unsigned long i, shown; 154 unsigned long i, shown;
100 155
109 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 164 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
110 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 165 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
111 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 166 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
112 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 167 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
113 continue; \ 168 continue; \
114 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 169 if (fix_elf && setpax) { \
170 /* set the paxctl flags */ \
171 ESET(phdr[i].p_flags, setpax); \
172 } \
173 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
115 continue; \ 174 continue; \
116 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 175 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
117 *found_pax = 1; \ 176 *found_pax = 1; \
118 ++shown; \ 177 ++shown; \
119 break; \ 178 break; \
120 } \ 179 } \
121 } 180 }
122 SHOW_PAX(32) 181 SHOW_PAX(32)
123 SHOW_PAX(64) 182 SHOW_PAX(64)
183 }
184
185 if (fix_elf && setpax) {
186 /* set the chpax settings */
187 if (elf->elf_class == ELFCLASS32) {
188 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
189 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
190 } else {
191 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
192 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
193 }
124 } 194 }
125 195
126 /* fall back to EI_PAX if no PT_PAX was found */ 196 /* fall back to EI_PAX if no PT_PAX was found */
127 if (!*ret) { 197 if (!*ret) {
128 static char *paxflags; 198 static char *paxflags;
163 uint32_t flags, check_flags; \ 233 uint32_t flags, check_flags; \
164 if (elf->phdr != NULL) { \ 234 if (elf->phdr != NULL) { \
165 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 235 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
166 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 236 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
167 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 237 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
238 if (multi_stack++) \
168 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 239 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
240 if (file_matches_list(elf->filename, qa_execstack)) \
241 continue; \
169 found = found_phdr; \ 242 found = found_phdr; \
170 offset = 0; \ 243 offset = 0; \
171 check_flags = PF_X; \ 244 check_flags = PF_X; \
172 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 245 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
246 if (multi_relro++) \
173 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 247 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
174 found = found_relro; \ 248 found = found_relro; \
175 offset = 4; \ 249 offset = 4; \
176 check_flags = PF_X; \ 250 check_flags = PF_X; \
177 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 251 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
178 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) \
253 if (multi_load++ > max_pt_load) \
179 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \ 254 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
255 if (file_matches_list(elf->filename, qa_wx_load)) \
256 continue; \
180 found = found_load; \ 257 found = found_load; \
181 offset = 8; \ 258 offset = 8; \
182 check_flags = PF_W|PF_X; \ 259 check_flags = PF_W|PF_X; \
183 } else \ 260 } else \
184 continue; \ 261 continue; \
185 flags = EGET(phdr[i].p_flags); \ 262 flags = EGET(phdr[i].p_flags); \
186 if (be_quiet && ((flags & check_flags) != check_flags)) \ 263 if (be_quiet && ((flags & check_flags) != check_flags)) \
187 continue; \ 264 continue; \
188 if (fix_elf && ((flags & PF_X) != flags)) { \ 265 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
189 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \ 266 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
190 ret[3] = ret[7] = '!'; \ 267 ret[3] = ret[7] = '!'; \
191 flags = EGET(phdr[i].p_flags); \ 268 flags = EGET(phdr[i].p_flags); \
192 } \ 269 } \
193 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 270 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
197 } else if (elf->shdr != NULL) { \ 274 } else if (elf->shdr != NULL) { \
198 /* no program headers which means this is prob an object file */ \ 275 /* no program headers which means this is prob an object file */ \
199 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 276 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
200 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 277 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
201 char *str; \ 278 char *str; \
202 if ((void*)strtbl > (void*)elf->data_end) \ 279 if ((void*)strtbl > elf->data_end) \
203 goto skip_this_shdr##B; \ 280 goto skip_this_shdr##B; \
204 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 281 check_flags = SHF_WRITE|SHF_EXECINSTR; \
205 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 282 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
206 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 283 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
207 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 284 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
221 break; \ 298 break; \
222 } \ 299 } \
223 } \ 300 } \
224 skip_this_shdr##B: \ 301 skip_this_shdr##B: \
225 if (!multi_stack) { \ 302 if (!multi_stack) { \
303 if (file_matches_list(elf->filename, qa_execstack)) \
304 return NULL; \
226 *found_phdr = 1; \ 305 *found_phdr = 1; \
227 shown = 1; \ 306 shown = 1; \
228 memcpy(ret, "!WX", 3); \ 307 memcpy(ret, "!WX", 3); \
229 } \ 308 } \
230 } \ 309 } \
235 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 314 if (be_wewy_wewy_quiet || (be_quiet && !shown))
236 return NULL; 315 return NULL;
237 else 316 else
238 return ret; 317 return ret;
239} 318}
319
320/*
321 * See if this ELF contains a DT_TEXTREL tag in any of its
322 * PT_DYNAMIC sections.
323 */
240static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 324static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
241{ 325{
242 static const char *ret = "TEXTREL"; 326 static const char *ret = "TEXTREL";
243 unsigned long i; 327 unsigned long i;
244 328
245 if (!show_textrel && !show_textrels) return NULL; 329 if (!show_textrel && !show_textrels) return NULL;
330
331 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
246 332
247 if (elf->phdr) { 333 if (elf->phdr) {
248#define SHOW_TEXTREL(B) \ 334#define SHOW_TEXTREL(B) \
249 if (elf->elf_class == ELFCLASS ## B) { \ 335 if (elf->elf_class == ELFCLASS ## B) { \
250 Elf ## B ## _Dyn *dyn; \ 336 Elf ## B ## _Dyn *dyn; \
251 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 337 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
252 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 338 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
253 Elf ## B ## _Off offset; \ 339 Elf ## B ## _Off offset; \
254 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 340 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
255 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; \
256 offset = EGET(phdr[i].p_offset); \ 342 offset = EGET(phdr[i].p_offset); \
257 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 343 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
258 dyn = DYN ## B (elf->data + offset); \ 344 dyn = DYN ## B (elf->vdata + offset); \
259 while (EGET(dyn->d_tag) != DT_NULL) { \ 345 while (EGET(dyn->d_tag) != DT_NULL) { \
260 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)*/ \
261 *found_textrel = 1; \ 347 *found_textrel = 1; \
262 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 348 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
263 return (be_wewy_wewy_quiet ? NULL : ret); \ 349 return (be_wewy_wewy_quiet ? NULL : ret); \
272 if (be_quiet || be_wewy_wewy_quiet) 358 if (be_quiet || be_wewy_wewy_quiet)
273 return NULL; 359 return NULL;
274 else 360 else
275 return " - "; 361 return " - ";
276} 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 */
277static 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)
278{ 370{
279 unsigned long s, r, rmax; 371 unsigned long s, r, rmax;
280 void *symtab_void, *strtab_void, *text_void; 372 void *symtab_void, *strtab_void, *text_void;
281 373
302 Elf ## B ## _Rela *rela; \ 394 Elf ## B ## _Rela *rela; \
303 /* search the section headers for relocations */ \ 395 /* search the section headers for relocations */ \
304 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 396 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
305 uint32_t sh_type = EGET(shdr[s].sh_type); \ 397 uint32_t sh_type = EGET(shdr[s].sh_type); \
306 if (sh_type == SHT_REL) { \ 398 if (sh_type == SHT_REL) { \
307 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 399 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
308 rela = NULL; \ 400 rela = NULL; \
309 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 401 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
310 } else if (sh_type == SHT_RELA) { \ 402 } else if (sh_type == SHT_RELA) { \
311 rel = NULL; \ 403 rel = NULL; \
312 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 404 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
313 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 405 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
314 } else \ 406 } else \
315 continue; \ 407 continue; \
316 /* now see if any of the relocs are in the .text */ \ 408 /* now see if any of the relocs are in the .text */ \
317 for (r = 0; r < rmax; ++r) { \ 409 for (r = 0; r < rmax; ++r) { \
332 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 424 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
333 if (be_verbose <= 2) continue; \ 425 if (be_verbose <= 2) continue; \
334 } else \ 426 } else \
335 *found_textrels = 1; \ 427 *found_textrels = 1; \
336 /* locate this relocation symbol name */ \ 428 /* locate this relocation symbol name */ \
337 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 429 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
338 if ((void*)sym > (void*)elf->data_end) { \ 430 if ((void*)sym > elf->data_end) { \
339 warn("%s: corrupt ELF symbol", elf->filename); \ 431 warn("%s: corrupt ELF symbol", elf->filename); \
340 continue; \ 432 continue; \
341 } \ 433 } \
342 sym_max = ELF ## B ## _R_SYM(r_info); \ 434 sym_max = ELF ## B ## _R_SYM(r_info); \
343 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 435 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
346 sym = NULL; \ 438 sym = NULL; \
347 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 439 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
348 /* show the raw details about this reloc */ \ 440 /* show the raw details about this reloc */ \
349 printf(" %s: ", elf->base_filename); \ 441 printf(" %s: ", elf->base_filename); \
350 if (sym && sym->st_name) \ 442 if (sym && sym->st_name) \
351 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)); \
352 else \ 444 else \
353 printf("(memory/fake?)"); \ 445 printf("(memory/data?)"); \
354 printf(" [0x%lX]", (unsigned long)r_offset); \ 446 printf(" [0x%lX]", (unsigned long)r_offset); \
355 /* 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 */ \
356 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 448 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
357 func = NULL; \ 449 func = NULL; \
358 offset_tmp = 0; \ 450 offset_tmp = 0; \
359 while (sym_max--) { \ 451 while (sym_max--) { \
360 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) { \
361 func = sym; \ 453 func = sym; \
362 offset_tmp = EGET(sym->st_value); \ 454 offset_tmp = EGET(sym->st_value); \
363 } \ 455 } \
364 ++sym; \ 456 ++sym; \
365 } \ 457 } \
366 printf(" in "); \ 458 printf(" in "); \
367 if (func && func->st_name) \ 459 if (func && func->st_name) { \
368 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); \
369 else \ 463 else \
370 printf("(NULL: fake?)"); \ 464 printf("%s", func_name); \
465 } else \
466 printf("(optimized out)"); \
371 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 } \
372 } \ 489 } \
373 } } 490 } }
374 SHOW_TEXTRELS(32) 491 SHOW_TEXTRELS(32)
375 SHOW_TEXTRELS(64) 492 SHOW_TEXTRELS(64)
376 } 493 }
378 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);
379 496
380 return NULL; 497 return NULL;
381} 498}
382 499
383static void rpath_security_checks(elfobj *, char *, const char *);
384static 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)
385{ 501{
386 struct stat st; 502 struct stat st;
387 switch (*item) { 503 switch (*item) {
388 case '/': break; 504 case '/': break;
394 warnf("Security problem NULL %s in %s", dt_type, elf->filename); 510 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
395 break; 511 break;
396 case '$': 512 case '$':
397 if (fstat(elf->fd, &st) != -1) 513 if (fstat(elf->fd, &st) != -1)
398 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 514 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
399 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",
400 dt_type, item, elf->filename, st.st_mode & 07777); 516 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
401 break; 517 break;
402 default: 518 default:
403 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);
404 break; 520 break;
405 } 521 }
406} 522}
407static 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)
408{ 524{
409 unsigned long i, s; 525 unsigned long i;
410 char *rpath, *runpath, **r; 526 char *rpath, *runpath, **r;
411 void *strtbl_void; 527 void *strtbl_void;
412 528
413 if (!show_rpath) return; 529 if (!show_rpath) return;
414 530
425 Elf ## B ## _Off offset; \ 541 Elf ## B ## _Off offset; \
426 Elf ## B ## _Xword word; \ 542 Elf ## B ## _Xword word; \
427 /* Scan all the program headers */ \ 543 /* Scan all the program headers */ \
428 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 544 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
429 /* Just scan dynamic headers */ \ 545 /* Just scan dynamic headers */ \
430 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; \
431 offset = EGET(phdr[i].p_offset); \ 547 offset = EGET(phdr[i].p_offset); \
432 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 548 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
433 /* Just scan dynamic RPATH/RUNPATH headers */ \ 549 /* Just scan dynamic RPATH/RUNPATH headers */ \
434 dyn = DYN ## B (elf->data + offset); \ 550 dyn = DYN ## B (elf->vdata + offset); \
435 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 551 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
436 if (word == DT_RPATH) { \ 552 if (word == DT_RPATH) { \
437 r = &rpath; \ 553 r = &rpath; \
438 } else if (word == DT_RUNPATH) { \ 554 } else if (word == DT_RUNPATH) { \
439 r = &runpath; \ 555 r = &runpath; \
443 } \ 559 } \
444 /* Verify the memory is somewhat sane */ \ 560 /* Verify the memory is somewhat sane */ \
445 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 561 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
446 if (offset < (Elf ## B ## _Off)elf->len) { \ 562 if (offset < (Elf ## B ## _Off)elf->len) { \
447 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 563 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
448 *r = (char*)(elf->data + offset); \ 564 *r = elf->data + offset; \
449 /* 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 */ \
450 if (fix_elf) \ 566 if (fix_elf) \
451 offset = strlen(*r); \ 567 offset = strlen(*r); \
452 /* If quiet, don't output paths in ld.so.conf */ \ 568 /* If quiet, don't output paths in ld.so.conf */ \
453 if (be_quiet) { \ 569 if (be_quiet) { \
459 /* scan each path in : delimited list */ \ 575 /* scan each path in : delimited list */ \
460 while (start) { \ 576 while (start) { \
461 rpath_security_checks(elf, start, get_elfdtype(word)); \ 577 rpath_security_checks(elf, start, get_elfdtype(word)); \
462 end = strchr(start, ':'); \ 578 end = strchr(start, ':'); \
463 len = (end ? abs(end - start) : strlen(start)); \ 579 len = (end ? abs(end - start) : strlen(start)); \
464 if (use_ldcache) \ 580 if (use_ldcache) { \
465 for (s = 0; ldpaths[s]; ++s) \ 581 size_t n; \
582 const char *ldpath; \
583 array_for_each(ldpaths, n, ldpath) \
466 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 584 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
467 *r = end; \ 585 *r = end; \
468 /* corner case ... if RPATH reads "/usr/lib:", we want \ 586 /* corner case ... if RPATH reads "/usr/lib:", we want \
469 * to show ':' rather than '' */ \ 587 * to show ':' rather than '' */ \
470 if (end && end[1] != '\0') \ 588 if (end && end[1] != '\0') \
471 (*r)++; \ 589 (*r)++; \
472 break; \ 590 break; \
473 } \ 591 } \
592 } \
474 if (!*r || !end) \ 593 if (!*r || !end) \
475 break; \ 594 break; \
476 else \ 595 else \
477 start = start + len + 1; \ 596 start = start + len + 1; \
478 } \ 597 } \
563#define FLAG_S390_LIB64 0x0400 682#define FLAG_S390_LIB64 0x0400
564#define FLAG_POWERPC_LIB64 0x0500 683#define FLAG_POWERPC_LIB64 0x0500
565#define FLAG_MIPS64_LIBN32 0x0600 684#define FLAG_MIPS64_LIBN32 0x0600
566#define FLAG_MIPS64_LIBN64 0x0700 685#define FLAG_MIPS64_LIBN64 0x0700
567 686
568static char *lookup_cache_lib(elfobj *, char *); 687#if defined(__GLIBC__) || defined(__UCLIBC__)
688
569static char *lookup_cache_lib(elfobj *elf, char *fname) 689static char *lookup_cache_lib(elfobj *elf, char *fname)
570{ 690{
571 int fd = 0; 691 int fd;
572 char *strs; 692 char *strs;
573 static char buf[__PAX_UTILS_PATH_MAX] = ""; 693 static char buf[__PAX_UTILS_PATH_MAX] = "";
574 const char *cachefile = "/etc/ld.so.cache"; 694 const char cachefile[] = "/etc/ld.so.cache";
575 struct stat st; 695 struct stat st;
576 696
577 typedef struct { 697 typedef struct {
578 char magic[LDSO_CACHE_MAGIC_LEN]; 698 char magic[LDSO_CACHE_MAGIC_LEN];
579 char version[LDSO_CACHE_VER_LEN]; 699 char version[LDSO_CACHE_VER_LEN];
589 libentry_t *libent; 709 libentry_t *libent;
590 710
591 if (fname == NULL) 711 if (fname == NULL)
592 return NULL; 712 return NULL;
593 713
594 if (ldcache == 0) { 714 if (ldcache == NULL) {
595 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)
596 return NULL; 720 return NULL;
597 721
598 /* 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 */
599 ldcache_size = st.st_size; 723 ldcache_size = st.st_size;
600 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0); 724 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
601
602 close(fd); 725 close(fd);
603 726
604 if (ldcache == (caddr_t)-1) { 727 if (ldcache == MAP_FAILED) {
605 ldcache = 0; 728 ldcache = NULL;
606 return NULL; 729 return NULL;
607 } 730 }
608 731
609 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;
610 return NULL; 737 return NULL;
611 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
612 return NULL;
613 } 738 }
739 } else
740 header = ldcache;
614 741
615 header = (header_t *) ldcache;
616 libent = (libentry_t *) (ldcache + sizeof(header_t)); 742 libent = ldcache + sizeof(header_t);
617 strs = (char *) &libent[header->nlibs]; 743 strs = (char *) &libent[header->nlibs];
618 744
619 for (fd = 0; fd < header->nlibs; fd++) { 745 for (fd = 0; fd < header->nlibs; ++fd) {
620 /* 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
621 * diff arches will not be cached together. and we ignore the 747 * diff arches will not be cached together, and we ignore the
622 * the different multilib mips cases. */ 748 * the different multilib mips cases.
749 */
623 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK)) 750 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
624 continue; 751 continue;
625 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK)) 752 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
626 continue; 753 continue;
627 754
628 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 755 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
629 continue; 756 continue;
757
758 /* Return first hit because that is how the ldso rolls */
630 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 759 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
760 break;
631 } 761 }
762
632 return buf; 763 return buf;
633} 764}
634 765
766#elif defined(__NetBSD__)
767static char *lookup_cache_lib(elfobj *elf, char *fname)
768{
769 static char buf[__PAX_UTILS_PATH_MAX] = "";
770 static struct stat st;
771 size_t n;
772 char *ldpath;
773
774 array_for_each(ldpath, n, ldpath) {
775 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
776 continue; /* if the pathname is too long, or something went wrong, ignore */
777
778 if (stat(buf, &st) != 0)
779 continue; /* if the lib doesn't exist in *ldpath, look further */
780
781 /* NetBSD doesn't actually do sanity checks, it just loads the file
782 * and if that doesn't work, continues looking in other directories.
783 * This cannot easily be safely emulated, unfortunately. For now,
784 * just assume that if it exists, it's a valid library. */
785
786 return buf;
787 }
788
789 /* not found in any path */
790 return NULL;
791}
792#else
793#ifdef __ELF__
794#warning Cache support not implemented for your target
795#endif
796static char *lookup_cache_lib(elfobj *elf, char *fname)
797{
798 return NULL;
799}
800#endif
635 801
636static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 802static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
637{ 803{
638 unsigned long i; 804 unsigned long i;
639 char *needed; 805 char *needed;
640 void *strtbl_void; 806 void *strtbl_void;
641 char *p; 807 char *p;
642 808
809 /*
810 * -n -> op==0 -> print all
811 * -N -> op==1 -> print requested
812 */
643 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 813 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
814 return NULL;
644 815
645 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 816 strtbl_void = elf_findsecbyname(elf, ".dynstr");
646 817
647 if (elf->phdr && strtbl_void) { 818 if (elf->phdr && strtbl_void) {
648#define SHOW_NEEDED(B) \ 819#define SHOW_NEEDED(B) \
650 Elf ## B ## _Dyn *dyn; \ 821 Elf ## B ## _Dyn *dyn; \
651 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 822 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
652 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 823 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
653 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 824 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
654 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 */ \
655 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 828 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
656 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; \
657 offset = EGET(phdr[i].p_offset); \ 831 offset = EGET(phdr[i].p_offset); \
658 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 */ \
659 dyn = DYN ## B (elf->data + offset); \ 835 dyn = DYN ## B (elf->vdata + offset); \
660 while (EGET(dyn->d_tag) != DT_NULL) { \ 836 while (EGET(dyn->d_tag) != DT_NULL) { \
661 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 837 if (EGET(dyn->d_tag) == DT_NEEDED) { \
662 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 838 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
663 if (offset >= (Elf ## B ## _Off)elf->len) { \ 839 if (offset >= (Elf ## B ## _Off)elf->len) { \
664 ++dyn; \ 840 ++dyn; \
665 continue; \ 841 continue; \
666 } \ 842 } \
667 needed = (char*)(elf->data + offset); \ 843 needed = elf->data + offset; \
668 if (op == 0) { \ 844 if (op == 0) { \
845 /* -n -> print all entries */ \
669 if (!be_wewy_wewy_quiet) { \ 846 if (!be_wewy_wewy_quiet) { \
670 if (*found_needed) xchrcat(ret, ',', ret_len); \ 847 if (*found_needed) xchrcat(ret, ',', ret_len); \
671 if (use_ldcache) \ 848 if (use_ldcache) \
672 if ((p = lookup_cache_lib(elf, needed)) != NULL) \ 849 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
673 needed = p; \ 850 needed = p; \
674 xstrcat(ret, needed, ret_len); \ 851 xstrcat(ret, needed, ret_len); \
675 } \ 852 } \
676 *found_needed = 1; \ 853 *found_needed = 1; \
677 } else { \ 854 } else { \
678 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)) { \
679 *found_lib = 1; \ 864 *found_lib = 1; \
680 return (be_wewy_wewy_quiet ? NULL : needed); \ 865 return (be_wewy_wewy_quiet ? NULL : find_lib); \
681 } \ 866 } \
682 } \ 867 } \
683 } \ 868 } \
684 ++dyn; \ 869 ++dyn; \
685 } \ 870 } \
714} 899}
715static char *scanelf_file_bind(elfobj *elf, char *found_bind) 900static char *scanelf_file_bind(elfobj *elf, char *found_bind)
716{ 901{
717 unsigned long i; 902 unsigned long i;
718 struct stat s; 903 struct stat s;
904 char dynamic = 0;
719 905
720 if (!show_bind) return NULL; 906 if (!show_bind) return NULL;
721 if (!elf->phdr) return NULL; 907 if (!elf->phdr) return NULL;
722 908
723#define SHOW_BIND(B) \ 909#define SHOW_BIND(B) \
725 Elf ## B ## _Dyn *dyn; \ 911 Elf ## B ## _Dyn *dyn; \
726 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 912 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
727 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 913 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
728 Elf ## B ## _Off offset; \ 914 Elf ## B ## _Off offset; \
729 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 915 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
730 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 916 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
917 dynamic = 1; \
731 offset = EGET(phdr[i].p_offset); \ 918 offset = EGET(phdr[i].p_offset); \
732 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 919 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
733 dyn = DYN ## B (elf->data + offset); \ 920 dyn = DYN ## B (elf->vdata + offset); \
734 while (EGET(dyn->d_tag) != DT_NULL) { \ 921 while (EGET(dyn->d_tag) != DT_NULL) { \
735 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 922 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
736 (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)) \
737 { \ 924 { \
738 if (be_quiet) return NULL; \ 925 if (be_quiet) return NULL; \
746 SHOW_BIND(32) 933 SHOW_BIND(32)
747 SHOW_BIND(64) 934 SHOW_BIND(64)
748 935
749 if (be_wewy_wewy_quiet) return NULL; 936 if (be_wewy_wewy_quiet) return NULL;
750 937
938 /* don't output anything if quiet mode and the ELF is static or not setuid */
751 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))))) {
752 return NULL; 940 return NULL;
753 } else { 941 } else {
754 *found_bind = 1; 942 *found_bind = 1;
755 return (char *) "LAZY"; 943 return (char *)(dynamic ? "LAZY" : "STATIC");
756 } 944 }
757} 945}
758static char *scanelf_file_soname(elfobj *elf, char *found_soname) 946static char *scanelf_file_soname(elfobj *elf, char *found_soname)
759{ 947{
760 unsigned long i; 948 unsigned long i;
772 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 960 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
773 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 961 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
774 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 962 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
775 Elf ## B ## _Off offset; \ 963 Elf ## B ## _Off offset; \
776 /* only look for soname in shared objects */ \ 964 /* only look for soname in shared objects */ \
777 if (ehdr->e_type != ET_DYN) \ 965 if (EGET(ehdr->e_type) != ET_DYN) \
778 return NULL; \ 966 return NULL; \
779 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 967 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
780 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; \
781 offset = EGET(phdr[i].p_offset); \ 969 offset = EGET(phdr[i].p_offset); \
782 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 970 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
783 dyn = DYN ## B (elf->data + offset); \ 971 dyn = DYN ## B (elf->vdata + offset); \
784 while (EGET(dyn->d_tag) != DT_NULL) { \ 972 while (EGET(dyn->d_tag) != DT_NULL) { \
785 if (EGET(dyn->d_tag) == DT_SONAME) { \ 973 if (EGET(dyn->d_tag) == DT_SONAME) { \
786 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 974 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
787 if (offset >= (Elf ## B ## _Off)elf->len) { \ 975 if (offset >= (Elf ## B ## _Off)elf->len) { \
788 ++dyn; \ 976 ++dyn; \
789 continue; \ 977 continue; \
790 } \ 978 } \
791 soname = (char*)(elf->data + offset); \ 979 soname = elf->data + offset; \
792 *found_soname = 1; \ 980 *found_soname = 1; \
793 return (be_wewy_wewy_quiet ? NULL : soname); \ 981 return (be_wewy_wewy_quiet ? NULL : soname); \
794 } \ 982 } \
795 ++dyn; \ 983 ++dyn; \
796 } \ 984 } \
799 SHOW_SONAME(64) 987 SHOW_SONAME(64)
800 } 988 }
801 989
802 return NULL; 990 return NULL;
803} 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
804static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1160static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
805{ 1161{
806 unsigned long i; 1162 unsigned long i;
807 char *ret; 1163 char *ret;
808 void *symtab_void, *strtab_void; 1164 void *symtab_void, *strtab_void;
809 1165
810 if (!find_sym) return NULL; 1166 if (!find_sym) return NULL;
811 ret = find_sym; 1167 ret = NULL;
812 1168
813 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1169 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
814 1170
815 if (symtab_void && strtab_void) { 1171 if (symtab_void && strtab_void) {
816#define FIND_SYM(B) \ 1172#define FIND_SYM(B) \
817 if (elf->elf_class == ELFCLASS ## B) { \ 1173 if (elf->elf_class == ELFCLASS ## B) { \
818 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1174 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
819 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1175 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
820 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)); \
821 unsigned long cnt = EGET(symtab->sh_entsize); \ 1177 unsigned long cnt = EGET(symtab->sh_entsize); \
822 char *symname; \ 1178 char *symname; \
1179 size_t ret_len = 0; \
823 if (cnt) \ 1180 if (cnt) \
824 cnt = EGET(symtab->sh_size) / cnt; \ 1181 cnt = EGET(symtab->sh_size) / cnt; \
825 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 } \
826 if (sym->st_name) { \ 1187 if (sym->st_name) { \
1188 /* make sure the symbol name is in acceptable memory range */ \
827 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1189 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
828 if ((void*)symname > (void*)elf->data_end) { \ 1190 if ((void*)symname > elf->data_end) { \
829 warnf("%s: corrupt ELF symbols", elf->filename); \ 1191 warnf("%s: corrupt ELF symbols", elf->filename); \
1192 ++sym; \
830 continue; \ 1193 continue; \
831 } \ 1194 } \
832 if (*find_sym == '*') { \ 1195 scanelf_match_symname(elf, found_sym, \
833 printf("%s(%s) %5lX %15s %s\n", \ 1196 &ret, &ret_len, symname, \
834 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1197 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
835 elf->base_filename, \ 1198 ELF##B##_ST_BIND(EGET(sym->st_info)), \
836 (unsigned long)sym->st_size, \ 1199 EGET(sym->st_shndx), \
837 get_elfstttype(sym->st_info), \ 1200 /* st_size can be 64bit, but no one is really that big, so screw em */ \
838 symname); \ 1201 EGET(sym->st_size)); \
839 *found_sym = 1; \
840 } else { \
841 char *this_sym, *next_sym; \
842 this_sym = find_sym; \
843 do { \
844 next_sym = strchr(this_sym, ','); \
845 if (next_sym == NULL) \
846 next_sym = this_sym + strlen(this_sym); \
847 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
848 (strcmp(symname, versioned_symname) == 0)) { \
849 ret = this_sym; \
850 (*found_sym)++; \
851 goto break_out; \
852 } \
853 this_sym = next_sym + 1; \
854 } while (*next_sym != '\0'); \
855 } \
856 } \ 1202 } \
857 ++sym; \ 1203 ++sym; \
858 } } 1204 } }
859 FIND_SYM(32) 1205 FIND_SYM(32)
860 FIND_SYM(64) 1206 FIND_SYM(64)
866 if (*find_sym != '*' && *found_sym) 1212 if (*find_sym != '*' && *found_sym)
867 return ret; 1213 return ret;
868 if (be_quiet) 1214 if (be_quiet)
869 return NULL; 1215 return NULL;
870 else 1216 else
871 return (char *)" - "; 1217 return " - ";
872} 1218}
873 1219
1220static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1221{
1222 if (!find_section)
1223 return NULL;
1224
1225#define FIND_SECTION(B) \
1226 if (elf->elf_class == ELFCLASS ## B) { \
1227 size_t matched, n; \
1228 int invert; \
1229 const char *section_name; \
1230 Elf ## B ## _Shdr *section; \
1231 \
1232 matched = 0; \
1233 array_for_each(find_section_arr, n, section_name) { \
1234 invert = (*section_name == '!' ? 1 : 0); \
1235 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1236 if ((section == NULL && invert) || (section != NULL && !invert)) \
1237 ++matched; \
1238 } \
1239 \
1240 if (matched == array_cnt(find_section_arr)) \
1241 *found_section = 1; \
1242 }
1243 FIND_SECTION(32)
1244 FIND_SECTION(64)
1245
1246 if (be_wewy_wewy_quiet)
1247 return NULL;
1248
1249 if (*found_section)
1250 return find_section;
1251
1252 if (be_quiet)
1253 return NULL;
1254 else
1255 return " - ";
1256}
874 1257
875/* scan an elf file and show all the fun stuff */ 1258/* scan an elf file and show all the fun stuff */
876#define prints(str) write(fileno(stdout), str, strlen(str)) 1259#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
877static int scanelf_elfobj(elfobj *elf) 1260static int scanelf_elfobj(elfobj *elf)
878{ 1261{
879 unsigned long i; 1262 unsigned long i;
880 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1263 char found_pax, found_phdr, found_relro, found_load, found_textrel,
881 found_rpath, found_needed, found_interp, found_bind, found_soname, 1264 found_rpath, found_needed, found_interp, found_bind, found_soname,
882 found_sym, found_lib, found_file, found_textrels; 1265 found_sym, found_lib, found_file, found_textrels, found_section;
883 static char *out_buffer = NULL; 1266 static char *out_buffer = NULL;
884 static size_t out_len; 1267 static size_t out_len;
885 1268
886 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1269 found_pax = found_phdr = found_relro = found_load = found_textrel = \
887 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1270 found_rpath = found_needed = found_interp = found_bind = found_soname = \
888 found_sym = found_lib = found_file = found_textrels = 0; 1271 found_sym = found_lib = found_file = found_textrels = found_section = 0;
889 1272
890 if (be_verbose > 2) 1273 if (be_verbose > 2)
891 printf("%s: scanning file {%s,%s}\n", elf->filename, 1274 printf("%s: scanning file {%s,%s}\n", elf->filename,
892 get_elfeitype(EI_CLASS, elf->elf_class), 1275 get_elfeitype(EI_CLASS, elf->elf_class),
893 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1276 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
895 printf("%s: scanning file\n", elf->filename); 1278 printf("%s: scanning file\n", elf->filename);
896 1279
897 /* init output buffer */ 1280 /* init output buffer */
898 if (!out_buffer) { 1281 if (!out_buffer) {
899 out_len = sizeof(char) * 80; 1282 out_len = sizeof(char) * 80;
900 out_buffer = (char*)xmalloc(out_len); 1283 out_buffer = xmalloc(out_len);
901 } 1284 }
902 *out_buffer = '\0'; 1285 *out_buffer = '\0';
903 1286
904 /* show the header */ 1287 /* show the header */
905 if (!be_quiet && show_banner) { 1288 if (!be_quiet && show_banner) {
906 for (i = 0; out_format[i]; ++i) { 1289 for (i = 0; out_format[i]; ++i) {
907 if (!IS_MODIFIER(out_format[i])) continue; 1290 if (!IS_MODIFIER(out_format[i])) continue;
908 1291
909 switch (out_format[++i]) { 1292 switch (out_format[++i]) {
1293 case '+': break;
910 case '%': break; 1294 case '%': break;
911 case '#': break; 1295 case '#': break;
912 case 'F': 1296 case 'F':
913 case 'p': 1297 case 'p':
914 case 'f': prints("FILE "); found_file = 1; break; 1298 case 'f': prints("FILE "); found_file = 1; break;
915 case 'o': prints(" TYPE "); break; 1299 case 'o': prints(" TYPE "); break;
916 case 'x': prints(" PAX "); break; 1300 case 'x': prints(" PAX "); break;
917 case 'e': prints("STK/REL/PTL "); break; 1301 case 'e': prints("STK/REL/PTL "); break;
918 case 't': prints("TEXTREL "); break; 1302 case 't': prints("TEXTREL "); break;
919 case 'r': prints("RPATH "); break; 1303 case 'r': prints("RPATH "); break;
1304 case 'M': prints("CLASS "); break;
920 case 'n': prints("NEEDED "); break; 1305 case 'n': prints("NEEDED "); break;
921 case 'i': prints("INTERP "); break; 1306 case 'i': prints("INTERP "); break;
922 case 'b': prints("BIND "); break; 1307 case 'b': prints("BIND "); break;
1308 case 'Z': prints("SIZE "); break;
923 case 'S': prints("SONAME "); break; 1309 case 'S': prints("SONAME "); break;
924 case 's': prints("SYM "); break; 1310 case 's': prints("SYM "); break;
925 case 'N': prints("LIB "); break; 1311 case 'N': prints("LIB "); break;
926 case 'T': prints("TEXTRELS "); break; 1312 case 'T': prints("TEXTRELS "); break;
1313 case 'k': prints("SECTION "); break;
1314 case 'a': prints("ARCH "); break;
1315 case 'I': prints("OSABI "); break;
1316 case 'Y': prints("EABI "); break;
1317 case 'O': prints("PERM "); break;
1318 case 'D': prints("ENDIAN "); break;
927 default: warnf("'%c' has no title ?", out_format[i]); 1319 default: warnf("'%c' has no title ?", out_format[i]);
928 } 1320 }
929 } 1321 }
930 if (!found_file) prints("FILE "); 1322 if (!found_file) prints("FILE ");
931 prints("\n"); 1323 prints("\n");
935 1327
936 /* dump all the good stuff */ 1328 /* dump all the good stuff */
937 for (i = 0; out_format[i]; ++i) { 1329 for (i = 0; out_format[i]; ++i) {
938 const char *out; 1330 const char *out;
939 const char *tmp; 1331 const char *tmp;
940 1332 static char ubuf[sizeof(unsigned long)*2];
941 /* make sure we trim leading spaces in quiet mode */
942 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
943 *out_buffer = '\0';
944
945 if (!IS_MODIFIER(out_format[i])) { 1333 if (!IS_MODIFIER(out_format[i])) {
946 xchrcat(&out_buffer, out_format[i], &out_len); 1334 xchrcat(&out_buffer, out_format[i], &out_len);
947 continue; 1335 continue;
948 } 1336 }
949 1337
950 out = NULL; 1338 out = NULL;
951 be_wewy_wewy_quiet = (out_format[i] == '#'); 1339 be_wewy_wewy_quiet = (out_format[i] == '#');
1340 be_semi_verbose = (out_format[i] == '+');
952 switch (out_format[++i]) { 1341 switch (out_format[++i]) {
1342 case '+':
953 case '%': 1343 case '%':
954 case '#': 1344 case '#':
955 xchrcat(&out_buffer, out_format[i], &out_len); break; 1345 xchrcat(&out_buffer, out_format[i], &out_len); break;
956 case 'F': 1346 case 'F':
957 found_file = 1; 1347 found_file = 1;
983 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1373 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
984 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;
985 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1375 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
986 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;
987 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;
988 case 'n': 1381 case 'n':
989 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;
990 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1383 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
991 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1384 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
992 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1385 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
993 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1386 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1387 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1388 case 'a': out = get_elfemtype(elf); break;
1389 case 'I': out = get_elfosabi(elf); break;
1390 case 'Y': out = get_elf_eabi(elf); break;
1391 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
994 default: warnf("'%c' has no scan code?", out_format[i]); 1392 default: warnf("'%c' has no scan code?", out_format[i]);
995 } 1393 }
996 if (out) { 1394 if (out)
997 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
998 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
999 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1000 else
1001 xstrcat(&out_buffer, out, &out_len); 1395 xstrcat(&out_buffer, out, &out_len);
1002 }
1003 } 1396 }
1004 1397
1005#define FOUND_SOMETHING() \ 1398#define FOUND_SOMETHING() \
1006 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1399 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1007 found_rpath || found_needed || found_interp || found_bind || \ 1400 found_rpath || found_needed || found_interp || found_bind || \
1008 found_soname || found_sym || found_lib || found_textrels) 1401 found_soname || found_sym || found_lib || found_textrels || found_section )
1009 1402
1010 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1403 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1011 xchrcat(&out_buffer, ' ', &out_len); 1404 xchrcat(&out_buffer, ' ', &out_len);
1012 xstrcat(&out_buffer, elf->filename, &out_len); 1405 xstrcat(&out_buffer, elf->filename, &out_len);
1013 } 1406 }
1020} 1413}
1021 1414
1022/* scan a single elf */ 1415/* scan a single elf */
1023static int scanelf_elf(const char *filename, int fd, size_t len) 1416static int scanelf_elf(const char *filename, int fd, size_t len)
1024{ 1417{
1025 int ret; 1418 int ret = 1;
1026 elfobj *elf; 1419 elfobj *elf;
1027 1420
1028 /* verify this is real ELF */ 1421 /* verify this is real ELF */
1029 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) { 1422 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1030 if (be_verbose > 2) printf("%s: not an ELF\n", filename); 1423 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1031 return 1; 1424 return ret;
1032 } 1425 }
1033 1426 switch (match_bits) {
1427 case 32:
1428 if (elf->elf_class != ELFCLASS32)
1429 goto label_done;
1430 break;
1431 case 64:
1432 if (elf->elf_class != ELFCLASS64)
1433 goto label_done;
1434 break;
1435 default: break;
1436 }
1034 if (strlen(match_etypes)) { 1437 if (match_etypes) {
1035 char sbuf[126]; 1438 char sbuf[126];
1036 strncpy(sbuf, match_etypes, sizeof(sbuf)); 1439 strncpy(sbuf, match_etypes, sizeof(sbuf));
1037 if (strchr(match_etypes, ',') != NULL) { 1440 if (strchr(match_etypes, ',') != NULL) {
1038 char *p; 1441 char *p;
1039 while((p = strrchr(sbuf, ',')) != NULL) { 1442 while ((p = strrchr(sbuf, ',')) != NULL) {
1040 *p = 0; 1443 *p = 0;
1041 if (atoi(p+1) == get_etype(elf)) 1444 if (etype_lookup(p+1) == get_etype(elf))
1042 goto label_ret; 1445 goto label_ret;
1043 } 1446 }
1044 } 1447 }
1045 if (atoi(sbuf) != get_etype(elf)) { 1448 if (etype_lookup(sbuf) != get_etype(elf))
1046 ret = 1;
1047 goto label_done; 1449 goto label_done;
1048 }
1049 } 1450 }
1050 1451
1051label_ret: 1452label_ret:
1052 ret = scanelf_elfobj(elf); 1453 ret = scanelf_elfobj(elf);
1053 1454
1066 1467
1067 ar = ar_open_fd(filename, fd); 1468 ar = ar_open_fd(filename, fd);
1068 if (ar == NULL) 1469 if (ar == NULL)
1069 return 1; 1470 return 1;
1070 1471
1071 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);
1072 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");
1073 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);
1074 if (elf) { 1478 if (elf) {
1075 scanelf_elfobj(elf); 1479 scanelf_elfobj(elf);
1076 unreadelf(elf); 1480 unreadelf(elf);
1077 } 1481 }
1078 } 1482 }
1079 munmap(ar_buffer, len); 1483 munmap(ar_buffer, len);
1080 1484
1081 return 0; 1485 return 0;
1082} 1486}
1083/* 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 */
1084static void scanelf_file(const char *filename) 1488static int scanelf_file(const char *filename, const struct stat *st_cache)
1085{ 1489{
1490 const struct stat *st = st_cache;
1086 struct stat st; 1491 struct stat symlink_st;
1087 int fd; 1492 int fd;
1088 1493
1089 /* make sure 'filename' exists */
1090 if (lstat(filename, &st) == -1) {
1091 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1092 return;
1093 }
1094
1095 /* always handle regular files and handle symlinked files if no -y */ 1494 /* always handle regular files and handle symlinked files if no -y */
1096 if (S_ISLNK(st.st_mode)) { 1495 if (S_ISLNK(st->st_mode)) {
1097 if (!scan_symlink) return; 1496 if (!scan_symlink) return 1;
1098 stat(filename, &st); 1497 stat(filename, &symlink_st);
1498 st = &symlink_st;
1099 } 1499 }
1500
1100 if (!S_ISREG(st.st_mode)) { 1501 if (!S_ISREG(st->st_mode)) {
1101 if (be_verbose > 2) printf("%s: skipping non-file\n", filename); 1502 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1102 return; 1503 return 1;
1103 } 1504 }
1104 1505
1506 if (match_perms) {
1507 if ((st->st_mode | match_perms) != st->st_mode)
1508 return 1;
1509 }
1105 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1) 1510 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1106 return; 1511 return 1;
1107 1512
1108 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives) 1513 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1109 /* 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 */
1110 scanelf_archive(filename, fd, st.st_size); 1515 scanelf_archive(filename, fd, st->st_size);
1111 1516
1112 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;
1113} 1529}
1114 1530
1115/* 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 */
1116static void scanelf_dir(const char *path) 1532static int scanelf_dir(const char *path)
1117{ 1533{
1118 register DIR *dir; 1534 register DIR *dir;
1119 register struct dirent *dentry; 1535 register struct dirent *dentry;
1120 struct stat st_top, st; 1536 struct stat st_top, st;
1121 char buf[__PAX_UTILS_PATH_MAX]; 1537 char buf[__PAX_UTILS_PATH_MAX];
1538 char _path[__PAX_UTILS_PATH_MAX];
1122 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);
1123 1543
1124 /* make sure path exists */ 1544 /* make sure path exists */
1125 if (lstat(path, &st_top) == -1) { 1545 if (lstat(path, &st_top) == -1) {
1126 if (be_verbose > 2) printf("%s: does not exist\n", path); 1546 if (be_verbose > 2) printf("%s: does not exist\n", path);
1127 return; 1547 return 1;
1128 } 1548 }
1129 1549
1130 /* 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 */
1131 if (!S_ISDIR(st_top.st_mode)) { 1551 if (!S_ISDIR(st_top.st_mode)) {
1132 scanelf_file(path); 1552 return scanelf_file(path, &st_top);
1133 return;
1134 } 1553 }
1135 1554
1136 /* now scan the dir looking for fun stuff */ 1555 /* now scan the dir looking for fun stuff */
1137 if ((dir = opendir(path)) == NULL) { 1556 if ((dir = opendir(path)) == NULL) {
1138 warnf("could not opendir %s: %s", path, strerror(errno)); 1557 warnf("could not opendir %s: %s", path, strerror(errno));
1139 return; 1558 return 1;
1140 } 1559 }
1141 if (be_verbose > 1) printf("%s: scanning dir\n", path); 1560 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1142 1561
1143 pathlen = strlen(path); 1562 pathlen = strlen(path);
1144 while ((dentry = readdir(dir))) { 1563 while ((dentry = readdir(dir))) {
1148 if (len >= sizeof(buf)) { 1567 if (len >= sizeof(buf)) {
1149 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1568 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1150 (unsigned long)len, (unsigned long)sizeof(buf)); 1569 (unsigned long)len, (unsigned long)sizeof(buf));
1151 continue; 1570 continue;
1152 } 1571 }
1153 sprintf(buf, "%s/%s", path, dentry->d_name); 1572 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1154 if (lstat(buf, &st) != -1) { 1573 if (lstat(buf, &st) != -1) {
1155 if (S_ISREG(st.st_mode)) 1574 if (S_ISREG(st.st_mode))
1156 scanelf_file(buf); 1575 ret = scanelf_file(buf, &st);
1157 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1576 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1158 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1577 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1159 scanelf_dir(buf); 1578 ret = scanelf_dir(buf);
1160 } 1579 }
1161 } 1580 }
1162 } 1581 }
1163 closedir(dir); 1582 closedir(dir);
1583 return ret;
1164} 1584}
1165 1585
1166static int scanelf_from_file(char *filename) 1586static int scanelf_from_file(const char *filename)
1167{ 1587{
1168 FILE *fp = NULL; 1588 FILE *fp = NULL;
1169 char *p; 1589 char *p;
1170 char path[__PAX_UTILS_PATH_MAX]; 1590 char path[__PAX_UTILS_PATH_MAX];
1591 int ret = 0;
1171 1592
1172 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1593 if (strcmp(filename, "-") == 0)
1173 fp = stdin; 1594 fp = stdin;
1174 else if ((fp = fopen(filename, "r")) == NULL) 1595 else if ((fp = fopen(filename, "r")) == NULL)
1175 return 1; 1596 return 1;
1176 1597
1177 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1598 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1178 if ((p = strchr(path, '\n')) != NULL) 1599 if ((p = strchr(path, '\n')) != NULL)
1179 *p = 0; 1600 *p = 0;
1180 search_path = path; 1601 search_path = path;
1181 scanelf_dir(path); 1602 ret = scanelf_dir(path);
1182 } 1603 }
1183 if (fp != stdin) 1604 if (fp != stdin)
1184 fclose(fp); 1605 fclose(fp);
1185 return 0; 1606 return ret;
1186} 1607}
1187 1608
1188static void load_ld_so_conf() 1609#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1610
1611static int load_ld_cache_config(int i, const char *fname)
1189{ 1612{
1190 FILE *fp = NULL; 1613 FILE *fp = NULL;
1191 char *p; 1614 char *p;
1192 char path[__PAX_UTILS_PATH_MAX]; 1615 char path[__PAX_UTILS_PATH_MAX];
1193 int i = 0; 1616 char _fname[__PAX_UTILS_PATH_MAX];
1194 1617
1618 fname = maybe_add_root(fname, _fname);
1619
1195 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1620 if ((fp = fopen(fname, "r")) == NULL)
1196 return; 1621 return i;
1197 1622
1198 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1623 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1199 if (*path != '/')
1200 continue;
1201
1202 if ((p = strrchr(path, '\r')) != NULL) 1624 if ((p = strrchr(path, '\r')) != NULL)
1203 *p = 0; 1625 *p = 0;
1204 if ((p = strchr(path, '\n')) != NULL) 1626 if ((p = strchr(path, '\n')) != NULL)
1205 *p = 0; 1627 *p = 0;
1206 1628
1207 ldpaths[i++] = xstrdup(path); 1629 /* recursive includes of the same file will make this segfault. */
1630 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1631 glob_t gl;
1632 size_t x;
1633 char gpath[__PAX_UTILS_PATH_MAX];
1208 1634
1209 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1635 memset(gpath, 0, sizeof(gpath));
1210 break; 1636 if (root)
1637 strcpy(gpath, root);
1638
1639 if (path[8] != '/')
1640 snprintf(gpath+strlen(gpath), sizeof(gpath)-strlen(gpath), "/etc/%s", &path[8]);
1641 else
1642 strncpy(gpath+strlen(gpath), &path[8], sizeof(gpath)-strlen(gpath));
1643
1644 if (glob(gpath, 0, NULL, &gl) == 0) {
1645 for (x = 0; x < gl.gl_pathc; ++x) {
1646 /* try to avoid direct loops */
1647 if (strcmp(gl.gl_pathv[x], fname) == 0)
1648 continue;
1649 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1650 }
1651 globfree(&gl);
1652 continue;
1653 }
1211 } 1654 }
1212 ldpaths[i] = NULL; 1655
1656 if (*path != '/')
1657 continue;
1658
1659 xarraypush(ldpaths, path, strlen(path));
1660 }
1213 1661
1214 fclose(fp); 1662 fclose(fp);
1663 return i;
1215} 1664}
1665
1666#elif defined(__FreeBSD__) || defined(__DragonFly__)
1667
1668static int load_ld_cache_config(int i, const char *fname)
1669{
1670 FILE *fp = NULL;
1671 char *b = NULL, *p;
1672 struct elfhints_hdr hdr;
1673 char _fname[__PAX_UTILS_PATH_MAX];
1674
1675 fname = maybe_add_root(fname, _fname);
1676
1677 if ((fp = fopen(fname, "r")) == NULL)
1678 return i;
1679
1680 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1681 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1682 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1683 {
1684 fclose(fp);
1685 return i;
1686 }
1687
1688 b = xmalloc(hdr.dirlistlen + 1);
1689 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1690 fclose(fp);
1691 free(b);
1692 return i;
1693 }
1694
1695 while ((p = strsep(&b, ":"))) {
1696 if (*p == '\0')
1697 continue;
1698 xarraypush(ldpaths, p, strlen(p));
1699 }
1700
1701 free(b);
1702 fclose(fp);
1703 return i;
1704}
1705
1706#else
1707#ifdef __ELF__
1708#warning Cache config support not implemented for your target
1709#endif
1710static int load_ld_cache_config(int i, const char *fname)
1711{
1712 return 0;
1713}
1714#endif
1216 1715
1217/* scan /etc/ld.so.conf for paths */ 1716/* scan /etc/ld.so.conf for paths */
1218static void scanelf_ldpath() 1717static void scanelf_ldpath(void)
1219{ 1718{
1220 char scan_l, scan_ul, scan_ull; 1719 char scan_l, scan_ul, scan_ull;
1720 size_t n;
1721 const char *ldpath;
1221 int i = 0; 1722 int i = 0;
1222 1723
1223 if (!ldpaths[0]) 1724 if (array_cnt(ldpaths) == 0)
1224 err("Unable to load any paths from ld.so.conf"); 1725 err("Unable to load any paths from ld.so.conf");
1225 1726
1226 scan_l = scan_ul = scan_ull = 0; 1727 scan_l = scan_ul = scan_ull = 0;
1227 1728
1228 while (ldpaths[i]) { 1729 array_for_each(ldpaths, n, ldpath) {
1229 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1; 1730 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = 1;
1230 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1; 1731 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = 1;
1231 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1; 1732 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = 1;
1232 scanelf_dir(ldpaths[i]); 1733 scanelf_dir(ldpath);
1233 ++i; 1734 ++i;
1234 } 1735 }
1235 1736
1236 if (!scan_l) scanelf_dir("/lib"); 1737 if (!scan_l) scanelf_dir("/lib");
1237 if (!scan_ul) scanelf_dir("/usr/lib"); 1738 if (!scan_ul) scanelf_dir("/usr/lib");
1238 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1739 if (!scan_ull) scanelf_dir("/usr/local/lib");
1239} 1740}
1240 1741
1241/* scan env PATH for paths */ 1742/* scan env PATH for paths */
1242static void scanelf_envpath() 1743static void scanelf_envpath(void)
1243{ 1744{
1244 char *path, *p; 1745 char *path, *p;
1245 1746
1246 path = getenv("PATH"); 1747 path = getenv("PATH");
1247 if (!path) 1748 if (!path)
1254 } 1755 }
1255 1756
1256 free(path); 1757 free(path);
1257} 1758}
1258 1759
1259 1760/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1260/* usage / invocation handling functions */
1261#define PARSE_FLAGS "plRmyAXxetrnLibSs:gN:TaqvF:f:o:E:BhV" 1761#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1262#define a_argument required_argument 1762#define a_argument required_argument
1263static struct option const long_opts[] = { 1763static struct option const long_opts[] = {
1264 {"path", no_argument, NULL, 'p'}, 1764 {"path", no_argument, NULL, 'p'},
1265 {"ldpath", no_argument, NULL, 'l'}, 1765 {"ldpath", no_argument, NULL, 'l'},
1766 {"root", a_argument, NULL, 128},
1266 {"recursive", no_argument, NULL, 'R'}, 1767 {"recursive", no_argument, NULL, 'R'},
1267 {"mount", no_argument, NULL, 'm'}, 1768 {"mount", no_argument, NULL, 'm'},
1268 {"symlink", no_argument, NULL, 'y'}, 1769 {"symlink", no_argument, NULL, 'y'},
1269 {"archives", no_argument, NULL, 'A'}, 1770 {"archives", no_argument, NULL, 'A'},
1270 {"ldcache", no_argument, NULL, 'L'}, 1771 {"ldcache", no_argument, NULL, 'L'},
1271 {"fix", no_argument, NULL, 'X'}, 1772 {"fix", no_argument, NULL, 'X'},
1773 {"setpax", a_argument, NULL, 'z'},
1272 {"pax", no_argument, NULL, 'x'}, 1774 {"pax", no_argument, NULL, 'x'},
1273 {"header", no_argument, NULL, 'e'}, 1775 {"header", no_argument, NULL, 'e'},
1274 {"textrel", no_argument, NULL, 't'}, 1776 {"textrel", no_argument, NULL, 't'},
1275 {"rpath", no_argument, NULL, 'r'}, 1777 {"rpath", no_argument, NULL, 'r'},
1276 {"needed", no_argument, NULL, 'n'}, 1778 {"needed", no_argument, NULL, 'n'},
1277 {"interp", no_argument, NULL, 'i'}, 1779 {"interp", no_argument, NULL, 'i'},
1278 {"bind", no_argument, NULL, 'b'}, 1780 {"bind", no_argument, NULL, 'b'},
1279 {"soname", no_argument, NULL, 'S'}, 1781 {"soname", no_argument, NULL, 'S'},
1280 {"symbol", a_argument, NULL, 's'}, 1782 {"symbol", a_argument, NULL, 's'},
1783 {"section", a_argument, NULL, 'k'},
1281 {"lib", a_argument, NULL, 'N'}, 1784 {"lib", a_argument, NULL, 'N'},
1282 {"gmatch", no_argument, NULL, 'g'}, 1785 {"gmatch", no_argument, NULL, 'g'},
1283 {"textrels", no_argument, NULL, 'T'}, 1786 {"textrels", no_argument, NULL, 'T'},
1284 {"etype", a_argument, NULL, 'E'}, 1787 {"etype", a_argument, NULL, 'E'},
1788 {"bits", a_argument, NULL, 'M'},
1789 {"endian", no_argument, NULL, 'D'},
1790 {"osabi", no_argument, NULL, 'I'},
1791 {"eabi", no_argument, NULL, 'Y'},
1792 {"perms", a_argument, NULL, 'O'},
1793 {"size", no_argument, NULL, 'Z'},
1285 {"all", no_argument, NULL, 'a'}, 1794 {"all", no_argument, NULL, 'a'},
1286 {"quiet", no_argument, NULL, 'q'}, 1795 {"quiet", no_argument, NULL, 'q'},
1287 {"verbose", no_argument, NULL, 'v'}, 1796 {"verbose", no_argument, NULL, 'v'},
1288 {"format", a_argument, NULL, 'F'}, 1797 {"format", a_argument, NULL, 'F'},
1289 {"from", a_argument, NULL, 'f'}, 1798 {"from", a_argument, NULL, 'f'},
1290 {"file", a_argument, NULL, 'o'}, 1799 {"file", a_argument, NULL, 'o'},
1800 {"nocolor", no_argument, NULL, 'C'},
1291 {"nobanner", no_argument, NULL, 'B'}, 1801 {"nobanner", no_argument, NULL, 'B'},
1292 {"help", no_argument, NULL, 'h'}, 1802 {"help", no_argument, NULL, 'h'},
1293 {"version", no_argument, NULL, 'V'}, 1803 {"version", no_argument, NULL, 'V'},
1294 {NULL, no_argument, NULL, 0x0} 1804 {NULL, no_argument, NULL, 0x0}
1295}; 1805};
1296 1806
1297static const char *opts_help[] = { 1807static const char * const opts_help[] = {
1298 "Scan all directories in PATH environment", 1808 "Scan all directories in PATH environment",
1299 "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)",
1300 "Scan directories recursively", 1811 "Scan directories recursively",
1301 "Don't recursively cross mount points", 1812 "Don't recursively cross mount points",
1302 "Don't scan symlinks", 1813 "Don't scan symlinks",
1303 "Scan archives (.a files)", 1814 "Scan archives (.a files)",
1304 "Utilize ld.so.cache information (use with -r/-n)", 1815 "Utilize ld.so.cache information (use with -r/-n)",
1305 "Try and 'fix' bad things (use with -r/-e)\n", 1816 "Try and 'fix' bad things (use with -r/-e)",
1817 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1306 "Print PaX markings", 1818 "Print PaX markings",
1307 "Print GNU_STACK/PT_LOAD markings", 1819 "Print GNU_STACK/PT_LOAD markings",
1308 "Print TEXTREL information", 1820 "Print TEXTREL information",
1309 "Print RPATH information", 1821 "Print RPATH information",
1310 "Print NEEDED information", 1822 "Print NEEDED information",
1311 "Print INTERP information", 1823 "Print INTERP information",
1312 "Print BIND information", 1824 "Print BIND information",
1313 "Print SONAME information", 1825 "Print SONAME information",
1314 "Find a specified symbol", 1826 "Find a specified symbol",
1827 "Find a specified section",
1315 "Find a specified library", 1828 "Find a specified library",
1316 "Use strncmp to match libraries. (use with -N)", 1829 "Use regex matching rather than string compare (use with -s)",
1317 "Locate cause of TEXTREL", 1830 "Locate cause of TEXTREL",
1831 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1318 "Print only ELF files matching numeric constant", 1832 "Print only ELF files matching numeric bits",
1319 "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",
1320 "Only output 'bad' things", 1839 "Only output 'bad' things",
1321 "Be verbose (can be specified more than once)", 1840 "Be verbose (can be specified more than once)",
1322 "Use specified format for output", 1841 "Use specified format for output",
1323 "Read input stream from a filename", 1842 "Read input stream from a filename",
1324 "Write output stream to a filename", 1843 "Write output stream to a filename",
1844 "Don't emit color in output",
1325 "Don't display the header", 1845 "Don't display the header",
1326 "Print this help and exit", 1846 "Print this help and exit",
1327 "Print version and exit", 1847 "Print version and exit",
1328 NULL 1848 NULL
1329}; 1849};
1335 printf("* Scan ELF binaries for stuff\n\n" 1855 printf("* Scan ELF binaries for stuff\n\n"
1336 "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);
1337 printf("Options: -[%s]\n", PARSE_FLAGS); 1857 printf("Options: -[%s]\n", PARSE_FLAGS);
1338 for (i = 0; long_opts[i].name; ++i) 1858 for (i = 0; long_opts[i].name; ++i)
1339 if (long_opts[i].has_arg == no_argument) 1859 if (long_opts[i].has_arg == no_argument)
1340 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 1860 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1861 long_opts[i].name, opts_help[i]);
1862 else if (long_opts[i].val > '~')
1863 printf(" --%-7s <arg> * %s\n",
1341 long_opts[i].name, opts_help[i]); 1864 long_opts[i].name, opts_help[i]);
1342 else 1865 else
1343 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 1866 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1344 long_opts[i].name, opts_help[i]); 1867 long_opts[i].name, opts_help[i]);
1345 1868
1346 if (status != EXIT_SUCCESS) 1869 puts("\nFor more information, see the scanelf(1) manpage");
1347 exit(status);
1348
1349 puts("\nThe format modifiers for the -F option are:");
1350 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1351 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1352 puts(" i INTERP \tb BIND \ts symbol");
1353 puts(" N library \to Type \tT TEXTRELs");
1354 puts(" S SONAME");
1355 puts(" p filename (with search path removed)");
1356 puts(" f filename (short name/basename)");
1357 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1358
1359 exit(status); 1870 exit(status);
1360} 1871}
1361 1872
1362/* 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 }
1363static void parseargs(int argc, char *argv[]) 1882static int parseargs(int argc, char *argv[])
1364{ 1883{
1365 int i; 1884 int i;
1366 char *from_file = NULL; 1885 const char *from_file = NULL;
1886 int ret = 0;
1367 1887
1368 opterr = 0; 1888 opterr = 0;
1369 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) {
1370 switch (i) { 1890 switch (i) {
1371 1891
1379 case 'f': 1899 case 'f':
1380 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");
1381 from_file = optarg; 1901 from_file = optarg;
1382 break; 1902 break;
1383 case 'E': 1903 case 'E':
1384 strncpy(match_etypes, optarg, sizeof(match_etypes)); 1904 match_etypes = optarg;
1905 break;
1906 case 'M':
1907 match_bits = atoi(optarg);
1908 if (match_bits == 0) {
1909 if (strcmp(optarg, "ELFCLASS32") == 0)
1910 match_bits = 32;
1911 if (strcmp(optarg, "ELFCLASS64") == 0)
1912 match_bits = 64;
1913 }
1914 break;
1915 case 'O':
1916 if (sscanf(optarg, "%o", &match_perms) == -1)
1917 match_bits = 0;
1385 break; 1918 break;
1386 case 'o': { 1919 case 'o': {
1387 FILE *fp = NULL;
1388 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1920 if (freopen(optarg, "w", stdout) == NULL)
1389 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1921 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1390 SET_STDOUT(fp);
1391 break; 1922 break;
1392 } 1923 }
1393 1924 case 'k':
1925 xarraypush(find_section_arr, optarg, strlen(optarg));
1926 break;
1394 case 's': { 1927 case 's': {
1395 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");
1396 find_sym = optarg; 1929 find_sym = optarg;
1397 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1398 sprintf(versioned_symname, "%s@", find_sym);
1399 break; 1930 break;
1400 } 1931 }
1401 case 'N': { 1932 case 'N':
1402 if (find_lib) warn("You prob don't want to specify -N twice"); 1933 xarraypush(find_lib_arr, optarg, strlen(optarg));
1403 find_lib = optarg;
1404 break; 1934 break;
1405 }
1406
1407 case 'F': { 1935 case 'F': {
1408 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");
1409 out_format = optarg; 1937 out_format = optarg;
1410 break; 1938 break;
1411 } 1939 }
1940 case 'z': {
1941 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1942 size_t x;
1412 1943
1413 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */ 1944 for (x = 0; x < strlen(optarg); x++) {
1945 switch (optarg[x]) {
1946 case 'p':
1947 case 'P':
1948 do_pax_state(optarg[x], PAGEEXEC);
1949 break;
1950 case 's':
1951 case 'S':
1952 do_pax_state(optarg[x], SEGMEXEC);
1953 break;
1954 case 'm':
1955 case 'M':
1956 do_pax_state(optarg[x], MPROTECT);
1957 break;
1958 case 'e':
1959 case 'E':
1960 do_pax_state(optarg[x], EMUTRAMP);
1961 break;
1962 case 'r':
1963 case 'R':
1964 do_pax_state(optarg[x], RANDMMAP);
1965 break;
1966 case 'x':
1967 case 'X':
1968 do_pax_state(optarg[x], RANDEXEC);
1969 break;
1970 default:
1971 break;
1972 }
1973 }
1974 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1975 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1976 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1977 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1978 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1979 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1980 setpax = flags;
1981 break;
1982 }
1983 case 'Z': show_size = 1; break;
1984 case 'g': g_match = 1; break;
1414 case 'L': use_ldcache = 1; break; 1985 case 'L': use_ldcache = 1; break;
1415 case 'y': scan_symlink = 0; break; 1986 case 'y': scan_symlink = 0; break;
1416 case 'A': scan_archives = 1; break; 1987 case 'A': scan_archives = 1; break;
1988 case 'C': color_init(true); break;
1417 case 'B': show_banner = 0; break; 1989 case 'B': show_banner = 0; break;
1418 case 'l': scan_ldpath = 1; break; 1990 case 'l': scan_ldpath = 1; break;
1419 case 'p': scan_envpath = 1; break; 1991 case 'p': scan_envpath = 1; break;
1420 case 'R': dir_recurse = 1; break; 1992 case 'R': dir_recurse = 1; break;
1421 case 'm': dir_crossmount = 0; break; 1993 case 'm': dir_crossmount = 0; break;
1429 case 'b': show_bind = 1; break; 2001 case 'b': show_bind = 1; break;
1430 case 'S': show_soname = 1; break; 2002 case 'S': show_soname = 1; break;
1431 case 'T': show_textrels = 1; break; 2003 case 'T': show_textrels = 1; break;
1432 case 'q': be_quiet = 1; break; 2004 case 'q': be_quiet = 1; break;
1433 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2005 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1434 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;
1435 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;
1436 case ':': 2013 case ':':
1437 err("Option '%c' is missing parameter", optopt); 2014 err("Option '%c' is missing parameter", optopt);
1438 case '?': 2015 case '?':
1439 err("Unknown option '%c' or argument missing", optopt); 2016 err("Unknown option '%c' or argument missing", optopt);
1440 default: 2017 default:
1441 err("Unhandled option '%c'; please report this", i); 2018 err("Unhandled option '%c'; please report this", i);
1442 } 2019 }
1443 } 2020 }
1444 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);
1445 /* let the format option override all other options */ 2030 /* let the format option override all other options */
1446 if (out_format) { 2031 if (out_format) {
1447 show_pax = show_phdr = show_textrel = show_rpath = \ 2032 show_pax = show_phdr = show_textrel = show_rpath = \
1448 show_needed = show_interp = show_bind = show_soname = \ 2033 show_needed = show_interp = show_bind = show_soname = \
1449 show_textrels = 0; 2034 show_textrels = show_perms = show_endian = show_size = \
2035 show_osabi = show_eabi = 0;
1450 for (i = 0; out_format[i]; ++i) { 2036 for (i = 0; out_format[i]; ++i) {
1451 if (!IS_MODIFIER(out_format[i])) continue; 2037 if (!IS_MODIFIER(out_format[i])) continue;
1452 2038
1453 switch (out_format[++i]) { 2039 switch (out_format[++i]) {
2040 case '+': break;
1454 case '%': break; 2041 case '%': break;
1455 case '#': break; 2042 case '#': break;
1456 case 'F': break; 2043 case 'F': break;
1457 case 'p': break; 2044 case 'p': break;
1458 case 'f': break; 2045 case 'f': break;
2046 case 'k': break;
1459 case 's': break; 2047 case 's': break;
1460 case 'N': break; 2048 case 'N': break;
1461 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;
1462 case 'x': show_pax = 1; break; 2057 case 'x': show_pax = 1; break;
1463 case 'e': show_phdr = 1; break; 2058 case 'e': show_phdr = 1; break;
1464 case 't': show_textrel = 1; break; 2059 case 't': show_textrel = 1; break;
1465 case 'r': show_rpath = 1; break; 2060 case 'r': show_rpath = 1; break;
1466 case 'n': show_needed = 1; break; 2061 case 'n': show_needed = 1; break;
1467 case 'i': show_interp = 1; break; 2062 case 'i': show_interp = 1; break;
1468 case 'b': show_bind = 1; break; 2063 case 'b': show_bind = 1; break;
1469 case 'S': show_soname = 1; break; 2064 case 'S': show_soname = 1; break;
1470 case 'T': show_textrels = 1; break; 2065 case 'T': show_textrels = 1; break;
1471 default: 2066 default:
1472 err("Invalid format specifier '%c' (byte %i)", 2067 err("Invalid format specifier '%c' (byte %i)",
1473 out_format[i], i+1); 2068 out_format[i], i+1);
1474 } 2069 }
1475 } 2070 }
1476 2071
1477 /* construct our default format */ 2072 /* construct our default format */
1478 } else { 2073 } else {
1479 size_t fmt_len = 30; 2074 size_t fmt_len = 30;
1480 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2075 out_format = xmalloc(sizeof(char) * fmt_len);
2076 *out_format = '\0';
1481 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2077 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1482 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);
1483 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2084 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1484 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2085 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1485 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2086 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1486 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2087 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1487 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2088 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1488 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2089 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1489 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2090 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1490 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2091 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1491 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2092 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2093 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1492 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2094 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1493 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2095 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1494 } 2096 }
1495 if (be_verbose > 2) printf("Format: %s\n", out_format); 2097 if (be_verbose > 2) printf("Format: %s\n", out_format);
1496 2098
1497 /* now lets actually do the scanning */ 2099 /* now lets actually do the scanning */
1498 if (scan_ldpath || use_ldcache) 2100 if (scan_ldpath || use_ldcache)
1499 load_ld_so_conf(); 2101 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1500 if (scan_ldpath) scanelf_ldpath(); 2102 if (scan_ldpath) scanelf_ldpath();
1501 if (scan_envpath) scanelf_envpath(); 2103 if (scan_envpath) scanelf_envpath();
2104 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2105 from_file = "-";
1502 if (from_file) { 2106 if (from_file) {
1503 scanelf_from_file(from_file); 2107 scanelf_from_file(from_file);
1504 from_file = *argv; 2108 from_file = *argv;
1505 } 2109 }
1506 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2110 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1507 err("Nothing to scan !?"); 2111 err("Nothing to scan !?");
1508 while (optind < argc) { 2112 while (optind < argc) {
1509 search_path = argv[optind++]; 2113 search_path = argv[optind++];
1510 scanelf_dir(search_path); 2114 ret = scanelf_dir(search_path);
1511 } 2115 }
1512 2116
1513 /* clean up */ 2117 /* clean up */
1514 if (versioned_symname) free(versioned_symname);
1515 for (i = 0; ldpaths[i]; ++i)
1516 free(ldpaths[i]); 2118 xarrayfree(ldpaths);
2119 xarrayfree(find_lib_arr);
2120 xarrayfree(find_section_arr);
2121 free(find_lib);
2122 free(find_section);
1517 2123
1518 if (ldcache != 0) 2124 if (ldcache != 0)
1519 munmap(ldcache, ldcache_size); 2125 munmap(ldcache, ldcache_size);
1520}
1521
1522
1523
1524/* utility funcs */
1525static char *xstrdup(const char *s)
1526{
1527 char *ret = strdup(s);
1528 if (!ret) err("Could not strdup(): %s", strerror(errno));
1529 return ret; 2126 return ret;
1530} 2127}
1531static void *xmalloc(size_t size)
1532{
1533 void *ret = malloc(size);
1534 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1535 return ret;
1536}
1537static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1538{
1539 size_t new_len;
1540 2128
1541 new_len = strlen(*dst) + strlen(src); 2129static char **get_split_env(const char *envvar)
1542 if (*curr_len <= new_len) {
1543 *curr_len = new_len + (*curr_len / 2);
1544 *dst = realloc(*dst, *curr_len);
1545 if (!*dst)
1546 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1547 }
1548
1549 if (n)
1550 strncat(*dst, src, n);
1551 else
1552 strcat(*dst, src);
1553}
1554static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1555{ 2130{
1556 static char my_app[2]; 2131 const char *delims = " \t\n";
1557 my_app[0] = append; 2132 char **envvals = NULL;
1558 my_app[1] = '\0'; 2133 char *env, *s;
1559 xstrcat(dst, my_app, curr_len); 2134 int nentry;
1560}
1561 2135
2136 if ((env = getenv(envvar)) == NULL)
2137 return NULL;
1562 2138
2139 env = xstrdup(env);
2140 if (env == NULL)
2141 return NULL;
2142
2143 s = strtok(env, delims);
2144 if (s == NULL) {
2145 free(env);
2146 return NULL;
2147 }
2148
2149 nentry = 0;
2150 while (s != NULL) {
2151 ++nentry;
2152 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2153 envvals[nentry-1] = s;
2154 s = strtok(NULL, delims);
2155 }
2156 envvals[nentry] = NULL;
2157
2158 /* don't want to free(env) as it contains the memory that backs
2159 * the envvals array of strings */
2160 return envvals;
2161}
2162
2163static void parseenv(void)
2164{
2165 color_init(false);
2166 qa_textrels = get_split_env("QA_TEXTRELS");
2167 qa_execstack = get_split_env("QA_EXECSTACK");
2168 qa_wx_load = get_split_env("QA_WX_LOAD");
2169}
2170
2171#ifdef __PAX_UTILS_CLEANUP
2172static void cleanup(void)
2173{
2174 free(out_format);
2175 free(qa_textrels);
2176 free(qa_execstack);
2177 free(qa_wx_load);
2178}
2179#endif
1563 2180
1564int main(int argc, char *argv[]) 2181int main(int argc, char *argv[])
1565{ 2182{
2183 int ret;
1566 if (argc < 2) 2184 if (argc < 2)
1567 usage(EXIT_FAILURE); 2185 usage(EXIT_FAILURE);
2186 parseenv();
1568 parseargs(argc, argv); 2187 ret = parseargs(argc, argv);
1569 fclose(stdout); 2188 fclose(stdout);
1570#ifdef __BOUNDS_CHECKING_ON 2189#ifdef __PAX_UTILS_CLEANUP
1571 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); 2190 cleanup();
2191 warn("The calls to add/delete heap should be off:\n"
2192 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
2193 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1572#endif 2194#endif
1573 return EXIT_SUCCESS; 2195 return ret;
1574} 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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