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Revision 1.213 - (hide annotations) (download) (as text)
Tue Dec 1 10:18:58 2009 UTC (4 years, 8 months ago) by vapier
Branch: MAIN
Changes since 1.212: +22 -19 lines
File MIME type: text/x-csrc
unify some of the scanelf symtabs code paths

1 solar 1.1 /*
2 solar 1.178 * Copyright 2003-2007 Gentoo Foundation
3 solar 1.1 * Distributed under the terms of the GNU General Public License v2
4 vapier 1.213 * $Header: /var/cvsroot/gentoo-projects/pax-utils/scanelf.c,v 1.212 2009/03/15 09:13:20 vapier Exp $
5 solar 1.1 *
6 solar 1.179 * Copyright 2003-2007 Ned Ludd - <solar@gentoo.org>
7     * Copyright 2004-2007 Mike Frysinger - <vapier@gentoo.org>
8 solar 1.1 */
9    
10 vapier 1.213 static const char *rcsid = "$Id: scanelf.c,v 1.212 2009/03/15 09:13:20 vapier Exp $";
11 vapier 1.186 const char * const argv0 = "scanelf";
12    
13 vapier 1.89 #include "paxinc.h"
14 flameeyes 1.141
15 solar 1.132 #define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
16 vapier 1.70
17 vapier 1.10 /* prototypes */
18 kevquinn 1.142 static int file_matches_list(const char *filename, char **matchlist);
19 vapier 1.106 static int scanelf_elfobj(elfobj *elf);
20     static int scanelf_elf(const char *filename, int fd, size_t len);
21     static int scanelf_archive(const char *filename, int fd, size_t len);
22 solar 1.164 static int scanelf_file(const char *filename, const struct stat *st_cache);
23     static int scanelf_dir(const char *path);
24 vapier 1.106 static void scanelf_ldpath(void);
25     static void scanelf_envpath(void);
26 vapier 1.10 static void usage(int status);
27 kevquinn 1.142 static char **get_split_env(const char *envvar);
28     static void parseenv(void);
29 solar 1.164 static int parseargs(int argc, char *argv[]);
30 solar 1.174 static int rematch(const char *regex, const char *match, int cflags);
31 vapier 1.10
32     /* variables to control behavior */
33 solar 1.119 static char match_etypes[126] = "";
34 vapier 1.48 static char *ldpaths[256];
35 vapier 1.10 static char scan_ldpath = 0;
36     static char scan_envpath = 0;
37 vapier 1.37 static char scan_symlink = 1;
38 vapier 1.105 static char scan_archives = 0;
39 vapier 1.10 static char dir_recurse = 0;
40 vapier 1.14 static char dir_crossmount = 1;
41 vapier 1.10 static char show_pax = 0;
42 solar 1.180 static char show_perms = 0;
43 solar 1.190 static char show_size = 0;
44 solar 1.73 static char show_phdr = 0;
45 vapier 1.10 static char show_textrel = 0;
46     static char show_rpath = 0;
47 vapier 1.32 static char show_needed = 0;
48 vapier 1.38 static char show_interp = 0;
49 vapier 1.49 static char show_bind = 0;
50 vapier 1.84 static char show_soname = 0;
51 vapier 1.76 static char show_textrels = 0;
52 solar 1.16 static char show_banner = 1;
53 solar 1.181 static char show_endian = 0;
54 solar 1.191 static char show_osabi = 0;
55     static char show_eabi = 0;
56 vapier 1.10 static char be_quiet = 0;
57 vapier 1.14 static char be_verbose = 0;
58 solar 1.127 static char be_wewy_wewy_quiet = 0;
59 solar 1.132 static char be_semi_verbose = 0;
60 flameeyes 1.198 static char *find_sym = NULL;
61 vapier 1.72 static char *find_lib = NULL;
62 solar 1.124 static char *find_section = NULL;
63 vapier 1.39 static char *out_format = NULL;
64 vapier 1.66 static char *search_path = NULL;
65 vapier 1.101 static char fix_elf = 0;
66 solar 1.176 static char g_match = 0;
67 vapier 1.102 static char use_ldcache = 0;
68 solar 1.1
69 kevquinn 1.142 static char **qa_textrels = NULL;
70     static char **qa_execstack = NULL;
71 kevquinn 1.145 static char **qa_wx_load = NULL;
72 kevquinn 1.142
73 vapier 1.203 static int match_bits = 0;
74     static unsigned int match_perms = 0;
75 vapier 1.212 static void *ldcache = NULL;
76 vapier 1.203 static size_t ldcache_size = 0;
77     static unsigned long setpax = 0UL;
78 solar 1.96
79 vapier 1.203 static int has_objdump = 0;
80 solar 1.175
81 solar 1.174 /* find the path to a file by name */
82 solar 1.170 static char *which(const char *fname)
83     {
84 vapier 1.207 static char fullpath[__PAX_UTILS_PATH_MAX];
85 vapier 1.172 char *path, *p;
86 solar 1.170
87 vapier 1.172 path = getenv("PATH");
88     if (!path)
89 solar 1.170 return NULL;
90    
91 vapier 1.172 path = xstrdup(path);
92     while ((p = strrchr(path, ':')) != NULL) {
93 solar 1.170 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
94 vapier 1.172 *p = 0;
95 vapier 1.205 if (access(fullpath, R_OK) != -1) {
96 solar 1.170 free(path);
97 vapier 1.204 return fullpath;
98 solar 1.170 }
99 vapier 1.172 }
100     free(path);
101 solar 1.170 return NULL;
102     }
103 vapier 1.152
104 solar 1.175 /* 1 on failure. 0 otherwise */
105 solar 1.174 static int rematch(const char *regex, const char *match, int cflags)
106     {
107     regex_t preg;
108     int ret;
109    
110     if ((match == NULL) || (regex == NULL))
111     return EXIT_FAILURE;
112    
113     if ((ret = regcomp(&preg, regex, cflags))) {
114     char err[256];
115    
116     if (regerror(ret, &preg, err, sizeof(err)))
117     fprintf(stderr, "regcomp failed: %s", err);
118     else
119     fprintf(stderr, "regcomp failed");
120    
121     return EXIT_FAILURE;
122     }
123     ret = regexec(&preg, match, 0, NULL, 0);
124     regfree(&preg);
125    
126     return ret;
127     }
128    
129 vapier 1.39 /* sub-funcs for scanelf_file() */
130 vapier 1.77 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
131     {
132     /* find the best SHT_DYNSYM and SHT_STRTAB sections */
133 vapier 1.213
134     /* debug sections */
135     void *symtab = elf_findsecbyname(elf, ".symtab");
136     void *strtab = elf_findsecbyname(elf, ".strtab");
137     /* runtime sections */
138     void *dynsym = elf_findsecbyname(elf, ".dynsym");
139     void *dynstr = elf_findsecbyname(elf, ".dynstr");
140    
141 vapier 1.77 #define GET_SYMTABS(B) \
142     if (elf->elf_class == ELFCLASS ## B) { \
143 vapier 1.213 if (symtab && dynsym) { \
144     Elf ## B ## _Shdr *esymtab = symtab; \
145     Elf ## B ## _Shdr *edynsym = dynsym; \
146     *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
147     } else \
148     *sym = symtab ? symtab : dynsym; \
149     if (strtab && dynstr) { \
150     Elf ## B ## _Shdr *estrtab = strtab; \
151     Elf ## B ## _Shdr *edynstr = dynstr; \
152     *tab = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
153     } else \
154     *tab = strtab ? strtab : dynstr; \
155 vapier 1.77 }
156     GET_SYMTABS(32)
157     GET_SYMTABS(64)
158     }
159 solar 1.127
160 vapier 1.41 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
161 solar 1.6 {
162 solar 1.61 static char ret[7];
163     unsigned long i, shown;
164    
165 vapier 1.41 if (!show_pax) return NULL;
166 vapier 1.10
167 solar 1.61 shown = 0;
168     memset(&ret, 0, sizeof(ret));
169    
170     if (elf->phdr) {
171     #define SHOW_PAX(B) \
172     if (elf->elf_class == ELFCLASS ## B) { \
173     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
174     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
175     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
176     if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
177     continue; \
178 solar 1.127 if (fix_elf && setpax) { \
179     /* set the paxctl flags */ \
180     ESET(phdr[i].p_flags, setpax); \
181     } \
182 solar 1.129 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
183 solar 1.61 continue; \
184     memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
185     *found_pax = 1; \
186     ++shown; \
187     break; \
188     } \
189     }
190     SHOW_PAX(32)
191     SHOW_PAX(64)
192     }
193    
194 solar 1.128 if (fix_elf && setpax) {
195     /* set the chpax settings */
196 solar 1.129 if (elf->elf_class == ELFCLASS32) {
197     if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
198     ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
199     } else {
200     if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
201     ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
202     }
203 solar 1.128 }
204    
205 solar 1.61 /* fall back to EI_PAX if no PT_PAX was found */
206     if (!*ret) {
207 vapier 1.90 static char *paxflags;
208 solar 1.61 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
209     if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
210     *found_pax = 1;
211 solar 1.127 return (be_wewy_wewy_quiet ? NULL : paxflags);
212 solar 1.61 }
213     strncpy(ret, paxflags, sizeof(ret));
214 vapier 1.14 }
215 vapier 1.41
216 solar 1.127 if (be_wewy_wewy_quiet || (be_quiet && !shown))
217 solar 1.61 return NULL;
218 vapier 1.90 else
219     return ret;
220     }
221 solar 1.61
222 solar 1.73 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
223 vapier 1.39 {
224 vapier 1.71 static char ret[12];
225 vapier 1.41 char *found;
226 vapier 1.99 unsigned long i, shown, multi_stack, multi_relro, multi_load;
227     int max_pt_load;
228 vapier 1.41
229 solar 1.73 if (!show_phdr) return NULL;
230 vapier 1.41
231 vapier 1.71 memcpy(ret, "--- --- ---\0", 12);
232    
233 vapier 1.41 shown = 0;
234 vapier 1.71 multi_stack = multi_relro = multi_load = 0;
235 vapier 1.99 max_pt_load = elf_max_pt_load(elf);
236 vapier 1.44
237 vapier 1.108 #define NOTE_GNU_STACK ".note.GNU-stack"
238 solar 1.73 #define SHOW_PHDR(B) \
239 vapier 1.39 if (elf->elf_class == ELFCLASS ## B) { \
240     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
241 vapier 1.91 Elf ## B ## _Off offset; \
242     uint32_t flags, check_flags; \
243     if (elf->phdr != NULL) { \
244     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
245     for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
246     if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
247 vapier 1.152 if (multi_stack++) \
248     warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
249     if (file_matches_list(elf->filename, qa_execstack)) \
250     continue; \
251     found = found_phdr; \
252     offset = 0; \
253     check_flags = PF_X; \
254 vapier 1.91 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
255 vapier 1.152 if (multi_relro++) \
256     warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
257 vapier 1.91 found = found_relro; \
258     offset = 4; \
259     check_flags = PF_X; \
260     } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
261 solar 1.188 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
262 vapier 1.152 if (multi_load++ > max_pt_load) \
263     warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
264     if (file_matches_list(elf->filename, qa_wx_load)) \
265     continue; \
266     found = found_load; \
267     offset = 8; \
268     check_flags = PF_W|PF_X; \
269 vapier 1.91 } else \
270     continue; \
271     flags = EGET(phdr[i].p_flags); \
272     if (be_quiet && ((flags & check_flags) != check_flags)) \
273     continue; \
274 solar 1.130 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
275 vapier 1.101 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
276     ret[3] = ret[7] = '!'; \
277     flags = EGET(phdr[i].p_flags); \
278     } \
279 vapier 1.91 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
280     *found = 1; \
281     ++shown; \
282     } \
283     } else if (elf->shdr != NULL) { \
284     /* no program headers which means this is prob an object file */ \
285     Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
286     Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
287 vapier 1.108 char *str; \
288 vapier 1.118 if ((void*)strtbl > (void*)elf->data_end) \
289 vapier 1.108 goto skip_this_shdr##B; \
290 vapier 1.91 check_flags = SHF_WRITE|SHF_EXECINSTR; \
291     for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
292     if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
293     offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
294 vapier 1.108 str = elf->data + offset; \
295     if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
296     if (!strcmp(str, NOTE_GNU_STACK)) { \
297 vapier 1.91 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
298     flags = EGET(shdr[i].sh_flags); \
299     if (be_quiet && ((flags & check_flags) != check_flags)) \
300     continue; \
301     ++*found_phdr; \
302     shown = 1; \
303     if (flags & SHF_WRITE) ret[0] = 'W'; \
304     if (flags & SHF_ALLOC) ret[1] = 'A'; \
305     if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
306     if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
307     break; \
308     } \
309     } \
310 vapier 1.108 skip_this_shdr##B: \
311 vapier 1.91 if (!multi_stack) { \
312 vapier 1.158 if (file_matches_list(elf->filename, qa_execstack)) \
313     return NULL; \
314 vapier 1.91 *found_phdr = 1; \
315     shown = 1; \
316     memcpy(ret, "!WX", 3); \
317     } \
318 vapier 1.39 } \
319     }
320 solar 1.73 SHOW_PHDR(32)
321     SHOW_PHDR(64)
322 vapier 1.44
323 solar 1.127 if (be_wewy_wewy_quiet || (be_quiet && !shown))
324 vapier 1.41 return NULL;
325     else
326     return ret;
327 vapier 1.39 }
328 kevquinn 1.142
329 vapier 1.186 /*
330     * See if this ELF contains a DT_TEXTREL tag in any of its
331     * PT_DYNAMIC sections.
332     */
333 vapier 1.90 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
334 vapier 1.39 {
335 vapier 1.90 static const char *ret = "TEXTREL";
336 vapier 1.44 unsigned long i;
337 vapier 1.41
338 vapier 1.79 if (!show_textrel && !show_textrels) return NULL;
339 vapier 1.41
340 kevquinn 1.142 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
341    
342 vapier 1.44 if (elf->phdr) {
343 vapier 1.39 #define SHOW_TEXTREL(B) \
344     if (elf->elf_class == ELFCLASS ## B) { \
345     Elf ## B ## _Dyn *dyn; \
346     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
347     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
348 vapier 1.44 Elf ## B ## _Off offset; \
349 vapier 1.39 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
350 vapier 1.185 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
351 vapier 1.44 offset = EGET(phdr[i].p_offset); \
352     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
353     dyn = DYN ## B (elf->data + offset); \
354 vapier 1.39 while (EGET(dyn->d_tag) != DT_NULL) { \
355     if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
356     *found_textrel = 1; \
357     /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
358 solar 1.127 return (be_wewy_wewy_quiet ? NULL : ret); \
359 vapier 1.39 } \
360     ++dyn; \
361 vapier 1.26 } \
362 vapier 1.39 } }
363     SHOW_TEXTREL(32)
364     SHOW_TEXTREL(64)
365 vapier 1.44 }
366    
367 solar 1.127 if (be_quiet || be_wewy_wewy_quiet)
368 vapier 1.41 return NULL;
369     else
370 vapier 1.90 return " - ";
371 vapier 1.39 }
372 solar 1.180
373 vapier 1.186 /*
374     * Scan the .text section to see if there are any relocations in it.
375     * Should rewrite this to check PT_LOAD sections that are marked
376     * Executable rather than the section named '.text'.
377     */
378 vapier 1.79 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
379 vapier 1.76 {
380 vapier 1.82 unsigned long s, r, rmax;
381     void *symtab_void, *strtab_void, *text_void;
382 vapier 1.76
383     if (!show_textrels) return NULL;
384    
385 vapier 1.79 /* don't search for TEXTREL's if the ELF doesn't have any */
386     if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
387     if (!*found_textrel) return NULL;
388    
389 vapier 1.77 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
390 vapier 1.82 text_void = elf_findsecbyname(elf, ".text");
391 vapier 1.76
392 vapier 1.82 if (symtab_void && strtab_void && text_void && elf->shdr) {
393 vapier 1.76 #define SHOW_TEXTRELS(B) \
394     if (elf->elf_class == ELFCLASS ## B) { \
395     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
396     Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
397     Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
398     Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
399 vapier 1.82 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
400     Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
401     uint ## B ## _t memsz = EGET(text->sh_size); \
402 vapier 1.76 Elf ## B ## _Rel *rel; \
403     Elf ## B ## _Rela *rela; \
404     /* search the section headers for relocations */ \
405     for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
406     uint32_t sh_type = EGET(shdr[s].sh_type); \
407     if (sh_type == SHT_REL) { \
408     rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
409     rela = NULL; \
410     rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
411     } else if (sh_type == SHT_RELA) { \
412     rel = NULL; \
413     rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
414     rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
415     } else \
416     continue; \
417 vapier 1.82 /* now see if any of the relocs are in the .text */ \
418     for (r = 0; r < rmax; ++r) { \
419     unsigned long sym_max; \
420     Elf ## B ## _Addr offset_tmp; \
421     Elf ## B ## _Sym *func; \
422     Elf ## B ## _Sym *sym; \
423     Elf ## B ## _Addr r_offset; \
424     uint ## B ## _t r_info; \
425     if (sh_type == SHT_REL) { \
426     r_offset = EGET(rel[r].r_offset); \
427     r_info = EGET(rel[r].r_info); \
428     } else { \
429     r_offset = EGET(rela[r].r_offset); \
430     r_info = EGET(rela[r].r_info); \
431     } \
432     /* make sure this relocation is inside of the .text */ \
433     if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
434     if (be_verbose <= 2) continue; \
435     } else \
436 vapier 1.78 *found_textrels = 1; \
437 vapier 1.82 /* locate this relocation symbol name */ \
438     sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
439 vapier 1.112 if ((void*)sym > (void*)elf->data_end) { \
440 vapier 1.111 warn("%s: corrupt ELF symbol", elf->filename); \
441 vapier 1.109 continue; \
442     } \
443 vapier 1.82 sym_max = ELF ## B ## _R_SYM(r_info); \
444     if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
445     sym += sym_max; \
446     else \
447     sym = NULL; \
448     sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
449     /* show the raw details about this reloc */ \
450 vapier 1.88 printf(" %s: ", elf->base_filename); \
451 vapier 1.82 if (sym && sym->st_name) \
452     printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
453     else \
454 vapier 1.169 printf("(memory/data?)"); \
455 vapier 1.82 printf(" [0x%lX]", (unsigned long)r_offset); \
456     /* now try to find the closest symbol that this rel is probably in */ \
457     sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
458     func = NULL; \
459     offset_tmp = 0; \
460     while (sym_max--) { \
461     if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
462     func = sym; \
463     offset_tmp = EGET(sym->st_value); \
464 vapier 1.76 } \
465 vapier 1.82 ++sym; \
466 vapier 1.76 } \
467 vapier 1.82 printf(" in "); \
468 vapier 1.169 if (func && func->st_name) { \
469     const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
470     if (r_offset > EGET(func->st_size)) \
471     printf("(optimized out: previous %s)", func_name); \
472     else \
473     printf("%s", func_name); \
474     } else \
475     printf("(optimized out)"); \
476 vapier 1.82 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
477 solar 1.170 if (be_verbose && has_objdump) { \
478 vapier 1.187 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
479 vapier 1.167 char *sysbuf; \
480     size_t syslen; \
481 vapier 1.209 int sysret; \
482 vapier 1.167 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"; \
483     syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
484     sysbuf = xmalloc(syslen); \
485 vapier 1.187 if (end_addr < r_offset) \
486     /* not uncommon when things are optimized out */ \
487     end_addr = r_offset + 0x100; \
488     snprintf(sysbuf, syslen, sysfmt, \
489     (unsigned long)offset_tmp, \
490     (unsigned long)end_addr, \
491     elf->filename, \
492     (unsigned long)r_offset); \
493     fflush(stdout); \
494 vapier 1.209 sysret = system(sysbuf); \
495 vapier 1.187 fflush(stdout); \
496     free(sysbuf); \
497 vapier 1.167 } \
498 vapier 1.76 } \
499     } }
500     SHOW_TEXTRELS(32)
501     SHOW_TEXTRELS(64)
502     }
503 vapier 1.82 if (!*found_textrels)
504     warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
505 vapier 1.76
506     return NULL;
507     }
508 solar 1.83
509 vapier 1.102 static void rpath_security_checks(elfobj *, char *, const char *);
510     static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
511 vapier 1.100 {
512 solar 1.83 struct stat st;
513 vapier 1.84 switch (*item) {
514 vapier 1.89 case '/': break;
515     case '.':
516 vapier 1.102 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
517 vapier 1.89 break;
518 vapier 1.100 case ':':
519 vapier 1.89 case '\0':
520 vapier 1.102 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
521 solar 1.83 break;
522     case '$':
523 vapier 1.84 if (fstat(elf->fd, &st) != -1)
524 solar 1.83 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
525 vapier 1.157 warnf("Security problem with %s='%s' in %s with mode set of %o",
526 solar 1.176 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
527 solar 1.83 break;
528     default:
529 vapier 1.102 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
530 solar 1.83 break;
531     }
532     }
533 vapier 1.41 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
534 vapier 1.39 {
535 vapier 1.48 unsigned long i, s;
536     char *rpath, *runpath, **r;
537 vapier 1.39 void *strtbl_void;
538 vapier 1.10
539 vapier 1.39 if (!show_rpath) return;
540 vapier 1.10
541 vapier 1.39 strtbl_void = elf_findsecbyname(elf, ".dynstr");
542     rpath = runpath = NULL;
543 vapier 1.10
544 vapier 1.44 if (elf->phdr && strtbl_void) {
545 vapier 1.26 #define SHOW_RPATH(B) \
546     if (elf->elf_class == ELFCLASS ## B) { \
547     Elf ## B ## _Dyn *dyn; \
548     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
549     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
550     Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
551 vapier 1.44 Elf ## B ## _Off offset; \
552 vapier 1.60 Elf ## B ## _Xword word; \
553 vapier 1.48 /* Scan all the program headers */ \
554 vapier 1.26 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
555 vapier 1.48 /* Just scan dynamic headers */ \
556 vapier 1.185 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
557 vapier 1.44 offset = EGET(phdr[i].p_offset); \
558     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
559 vapier 1.48 /* Just scan dynamic RPATH/RUNPATH headers */ \
560 vapier 1.44 dyn = DYN ## B (elf->data + offset); \
561 vapier 1.48 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
562     if (word == DT_RPATH) { \
563     r = &rpath; \
564     } else if (word == DT_RUNPATH) { \
565     r = &runpath; \
566     } else { \
567     ++dyn; \
568     continue; \
569     } \
570     /* Verify the memory is somewhat sane */ \
571     offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
572 vapier 1.69 if (offset < (Elf ## B ## _Off)elf->len) { \
573 vapier 1.48 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
574     *r = (char*)(elf->data + offset); \
575 vapier 1.103 /* cache the length in case we need to nuke this section later on */ \
576     if (fix_elf) \
577     offset = strlen(*r); \
578 vapier 1.48 /* If quiet, don't output paths in ld.so.conf */ \
579 vapier 1.69 if (be_quiet) { \
580     size_t len; \
581     char *start, *end; \
582 vapier 1.75 /* note that we only 'chop' off leading known paths. */ \
583     /* since *r is read-only memory, we can only move the ptr forward. */ \
584     start = *r; \
585     /* scan each path in : delimited list */ \
586     while (start) { \
587 vapier 1.102 rpath_security_checks(elf, start, get_elfdtype(word)); \
588 vapier 1.69 end = strchr(start, ':'); \
589 vapier 1.75 len = (end ? abs(end - start) : strlen(start)); \
590 vapier 1.102 if (use_ldcache) \
591     for (s = 0; ldpaths[s]; ++s) \
592     if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
593     *r = end; \
594     /* corner case ... if RPATH reads "/usr/lib:", we want \
595     * to show ':' rather than '' */ \
596     if (end && end[1] != '\0') \
597     (*r)++; \
598     break; \
599     } \
600 vapier 1.100 if (!*r || !end) \
601     break; \
602 vapier 1.75 else \
603     start = start + len + 1; \
604 vapier 1.69 } \
605     } \
606 vapier 1.101 if (*r) { \
607 solar 1.107 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
608 vapier 1.101 /* just nuke it */ \
609     nuke_it##B: \
610 vapier 1.103 memset(*r, 0x00, offset); \
611 vapier 1.102 *r = NULL; \
612 vapier 1.101 ESET(dyn->d_tag, DT_DEBUG); \
613 vapier 1.103 ESET(dyn->d_un.d_ptr, 0); \
614 vapier 1.101 } else if (fix_elf) { \
615     /* try to clean "bad" paths */ \
616     size_t len, tmpdir_len; \
617     char *start, *end; \
618     const char *tmpdir; \
619     start = *r; \
620     tmpdir = (getenv("TMPDIR") ? : "."); \
621     tmpdir_len = strlen(tmpdir); \
622     while (1) { \
623     end = strchr(start, ':'); \
624     if (start == end) { \
625     eat_this_path##B: \
626     len = strlen(end); \
627     memmove(start, end+1, len); \
628     start[len-1] = '\0'; \
629     end = start - 1; \
630     } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
631     if (!end) { \
632     if (start == *r) \
633     goto nuke_it##B; \
634     *--start = '\0'; \
635     } else \
636     goto eat_this_path##B; \
637     } \
638     if (!end) \
639     break; \
640     start = end + 1; \
641     } \
642 vapier 1.102 if (**r == '\0') \
643     goto nuke_it##B; \
644 vapier 1.101 } \
645 vapier 1.102 if (*r) \
646     *found_rpath = 1; \
647 vapier 1.101 } \
648 vapier 1.26 } \
649     ++dyn; \
650     } \
651     } }
652     SHOW_RPATH(32)
653     SHOW_RPATH(64)
654 vapier 1.10 }
655 vapier 1.41
656 solar 1.127 if (be_wewy_wewy_quiet) return;
657 vapier 1.70
658 vapier 1.39 if (rpath && runpath) {
659 vapier 1.41 if (!strcmp(rpath, runpath)) {
660     xstrcat(ret, runpath, ret_len);
661     } else {
662 vapier 1.39 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
663 vapier 1.41 xchrcat(ret, '{', ret_len);
664     xstrcat(ret, rpath, ret_len);
665     xchrcat(ret, ',', ret_len);
666     xstrcat(ret, runpath, ret_len);
667     xchrcat(ret, '}', ret_len);
668 vapier 1.39 }
669     } else if (rpath || runpath)
670 vapier 1.41 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
671     else if (!be_quiet)
672     xstrcat(ret, " - ", ret_len);
673 vapier 1.39 }
674 solar 1.96
675     #define LDSO_CACHE_MAGIC "ld.so-"
676     #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
677     #define LDSO_CACHE_VER "1.7.0"
678     #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
679 vapier 1.97 #define FLAG_ANY -1
680     #define FLAG_TYPE_MASK 0x00ff
681     #define FLAG_LIBC4 0x0000
682     #define FLAG_ELF 0x0001
683     #define FLAG_ELF_LIBC5 0x0002
684     #define FLAG_ELF_LIBC6 0x0003
685     #define FLAG_REQUIRED_MASK 0xff00
686     #define FLAG_SPARC_LIB64 0x0100
687     #define FLAG_IA64_LIB64 0x0200
688     #define FLAG_X8664_LIB64 0x0300
689     #define FLAG_S390_LIB64 0x0400
690     #define FLAG_POWERPC_LIB64 0x0500
691     #define FLAG_MIPS64_LIBN32 0x0600
692     #define FLAG_MIPS64_LIBN64 0x0700
693 solar 1.96
694 vapier 1.97 static char *lookup_cache_lib(elfobj *, char *);
695 vapier 1.148
696 flameeyes 1.141 #if defined(__GLIBC__) || defined(__UCLIBC__)
697 vapier 1.148
698 vapier 1.97 static char *lookup_cache_lib(elfobj *elf, char *fname)
699 solar 1.96 {
700 vapier 1.212 int fd;
701 solar 1.96 char *strs;
702 vapier 1.104 static char buf[__PAX_UTILS_PATH_MAX] = "";
703 vapier 1.212 const char cachefile[] = "/etc/ld.so.cache";
704 solar 1.96 struct stat st;
705    
706     typedef struct {
707     char magic[LDSO_CACHE_MAGIC_LEN];
708     char version[LDSO_CACHE_VER_LEN];
709     int nlibs;
710     } header_t;
711 vapier 1.97 header_t *header;
712 solar 1.96
713     typedef struct {
714     int flags;
715     int sooffset;
716     int liboffset;
717     } libentry_t;
718     libentry_t *libent;
719    
720     if (fname == NULL)
721     return NULL;
722    
723 vapier 1.212 if (ldcache == NULL) {
724     if (stat(cachefile, &st))
725     return NULL;
726    
727     fd = open(cachefile, O_RDONLY);
728     if (fd == -1)
729 solar 1.96 return NULL;
730 vapier 1.97
731     /* cache these values so we only map/unmap the cache file once */
732 solar 1.96 ldcache_size = st.st_size;
733 vapier 1.212 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
734 vapier 1.97 close(fd);
735 solar 1.96
736 vapier 1.202 if (ldcache == MAP_FAILED) {
737 vapier 1.212 ldcache = NULL;
738 solar 1.96 return NULL;
739 solar 1.116 }
740 solar 1.96
741 vapier 1.212 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
742     memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
743     {
744     munmap(ldcache, ldcache_size);
745     ldcache = NULL;
746 solar 1.96 return NULL;
747 vapier 1.212 }
748     } else
749     header = ldcache;
750 solar 1.96
751 vapier 1.212 libent = ldcache + sizeof(header_t);
752 solar 1.96 strs = (char *) &libent[header->nlibs];
753    
754 vapier 1.212 for (fd = 0; fd < header->nlibs; ++fd) {
755     /* This should be more fine grained, but for now we assume that
756     * diff arches will not be cached together, and we ignore the
757     * the different multilib mips cases.
758     */
759 vapier 1.97 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
760     continue;
761     if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
762     continue;
763    
764 solar 1.96 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
765     continue;
766 vapier 1.212
767     /* Return first hit because that is how the ldso rolls */
768 solar 1.96 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
769 vapier 1.212 break;
770 solar 1.96 }
771 vapier 1.212
772 solar 1.96 return buf;
773     }
774 vapier 1.212
775 solar 1.154 #elif defined(__NetBSD__)
776     static char *lookup_cache_lib(elfobj *elf, char *fname)
777     {
778     static char buf[__PAX_UTILS_PATH_MAX] = "";
779     static struct stat st;
780    
781     char **ldpath;
782     for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
783     if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
784     continue; /* if the pathname is too long, or something went wrong, ignore */
785    
786     if (stat(buf, &st) != 0)
787     continue; /* if the lib doesn't exist in *ldpath, look further */
788    
789     /* NetBSD doesn't actually do sanity checks, it just loads the file
790     * and if that doesn't work, continues looking in other directories.
791     * This cannot easily be safely emulated, unfortunately. For now,
792     * just assume that if it exists, it's a valid library. */
793 vapier 1.148
794 solar 1.154 return buf;
795     }
796    
797     /* not found in any path */
798     return NULL;
799     }
800 flameeyes 1.141 #else
801 vapier 1.192 #ifdef __ELF__
802 vapier 1.148 #warning Cache support not implemented for your target
803 vapier 1.192 #endif
804 flameeyes 1.141 static char *lookup_cache_lib(elfobj *elf, char *fname)
805     {
806     return NULL;
807     }
808     #endif
809 solar 1.96
810 vapier 1.84 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
811 vapier 1.39 {
812 vapier 1.44 unsigned long i;
813 vapier 1.39 char *needed;
814     void *strtbl_void;
815 solar 1.96 char *p;
816 vapier 1.39
817 vapier 1.72 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
818 vapier 1.10
819 vapier 1.39 strtbl_void = elf_findsecbyname(elf, ".dynstr");
820 vapier 1.32
821 vapier 1.44 if (elf->phdr && strtbl_void) {
822 vapier 1.32 #define SHOW_NEEDED(B) \
823     if (elf->elf_class == ELFCLASS ## B) { \
824     Elf ## B ## _Dyn *dyn; \
825     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
826     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
827     Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
828 vapier 1.44 Elf ## B ## _Off offset; \
829 vapier 1.32 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
830 vapier 1.185 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
831 vapier 1.44 offset = EGET(phdr[i].p_offset); \
832     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
833     dyn = DYN ## B (elf->data + offset); \
834 vapier 1.32 while (EGET(dyn->d_tag) != DT_NULL) { \
835     if (EGET(dyn->d_tag) == DT_NEEDED) { \
836 vapier 1.44 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
837 vapier 1.69 if (offset >= (Elf ## B ## _Off)elf->len) { \
838 vapier 1.49 ++dyn; \
839     continue; \
840     } \
841 vapier 1.44 needed = (char*)(elf->data + offset); \
842 vapier 1.72 if (op == 0) { \
843 solar 1.127 if (!be_wewy_wewy_quiet) { \
844 vapier 1.72 if (*found_needed) xchrcat(ret, ',', ret_len); \
845 vapier 1.102 if (use_ldcache) \
846 vapier 1.97 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
847 solar 1.96 needed = p; \
848 vapier 1.72 xstrcat(ret, needed, ret_len); \
849     } \
850     *found_needed = 1; \
851     } else { \
852 solar 1.176 if (!strncmp(find_lib, needed, strlen( !g_match ? needed : find_lib))) { \
853 vapier 1.81 *found_lib = 1; \
854 solar 1.127 return (be_wewy_wewy_quiet ? NULL : needed); \
855 vapier 1.81 } \
856 vapier 1.72 } \
857 vapier 1.32 } \
858     ++dyn; \
859     } \
860     } }
861     SHOW_NEEDED(32)
862     SHOW_NEEDED(64)
863 vapier 1.85 if (op == 0 && !*found_needed && be_verbose)
864 vapier 1.84 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
865 vapier 1.32 }
866 vapier 1.72
867     return NULL;
868 vapier 1.39 }
869 vapier 1.41 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
870 vapier 1.39 {
871     void *strtbl_void;
872    
873 vapier 1.41 if (!show_interp) return NULL;
874 vapier 1.32
875 vapier 1.39 strtbl_void = elf_findsecbyname(elf, ".interp");
876 vapier 1.38
877 vapier 1.39 if (strtbl_void) {
878 vapier 1.38 #define SHOW_INTERP(B) \
879     if (elf->elf_class == ELFCLASS ## B) { \
880 solar 1.40 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
881     *found_interp = 1; \
882 solar 1.127 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
883 vapier 1.38 }
884     SHOW_INTERP(32)
885     SHOW_INTERP(64)
886     }
887 vapier 1.41 return NULL;
888 vapier 1.39 }
889 vapier 1.49 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
890     {
891     unsigned long i;
892     struct stat s;
893 solar 1.131 char dynamic = 0;
894 vapier 1.49
895     if (!show_bind) return NULL;
896 vapier 1.51 if (!elf->phdr) return NULL;
897 vapier 1.49
898     #define SHOW_BIND(B) \
899     if (elf->elf_class == ELFCLASS ## B) { \
900     Elf ## B ## _Dyn *dyn; \
901     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
902     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
903     Elf ## B ## _Off offset; \
904     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
905 vapier 1.185 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
906 solar 1.131 dynamic = 1; \
907 vapier 1.49 offset = EGET(phdr[i].p_offset); \
908     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
909     dyn = DYN ## B (elf->data + offset); \
910     while (EGET(dyn->d_tag) != DT_NULL) { \
911     if (EGET(dyn->d_tag) == DT_BIND_NOW || \
912     (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
913     { \
914     if (be_quiet) return NULL; \
915     *found_bind = 1; \
916 solar 1.127 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
917 vapier 1.49 } \
918     ++dyn; \
919     } \
920     } \
921     }
922     SHOW_BIND(32)
923     SHOW_BIND(64)
924    
925 solar 1.127 if (be_wewy_wewy_quiet) return NULL;
926 vapier 1.70
927 vapier 1.159 /* don't output anything if quiet mode and the ELF is static or not setuid */
928     if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
929 vapier 1.49 return NULL;
930     } else {
931     *found_bind = 1;
932 solar 1.131 return (char *) (dynamic ? "LAZY" : "STATIC");
933 vapier 1.49 }
934     }
935 vapier 1.84 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
936     {
937     unsigned long i;
938     char *soname;
939     void *strtbl_void;
940    
941     if (!show_soname) return NULL;
942    
943     strtbl_void = elf_findsecbyname(elf, ".dynstr");
944    
945     if (elf->phdr && strtbl_void) {
946     #define SHOW_SONAME(B) \
947     if (elf->elf_class == ELFCLASS ## B) { \
948     Elf ## B ## _Dyn *dyn; \
949     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
950     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
951     Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
952     Elf ## B ## _Off offset; \
953     /* only look for soname in shared objects */ \
954 solar 1.188 if (EGET(ehdr->e_type) != ET_DYN) \
955 vapier 1.84 return NULL; \
956     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
957 vapier 1.185 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
958 vapier 1.84 offset = EGET(phdr[i].p_offset); \
959     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
960     dyn = DYN ## B (elf->data + offset); \
961     while (EGET(dyn->d_tag) != DT_NULL) { \
962     if (EGET(dyn->d_tag) == DT_SONAME) { \
963     offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
964     if (offset >= (Elf ## B ## _Off)elf->len) { \
965     ++dyn; \
966     continue; \
967     } \
968     soname = (char*)(elf->data + offset); \
969     *found_soname = 1; \
970 solar 1.127 return (be_wewy_wewy_quiet ? NULL : soname); \
971 vapier 1.84 } \
972     ++dyn; \
973     } \
974     } }
975     SHOW_SONAME(32)
976     SHOW_SONAME(64)
977     }
978    
979     return NULL;
980     }
981 solar 1.177
982 flameeyes 1.198 static int scanelf_match_symname(const char *symname, const char *tomatch) {
983 flameeyes 1.197 /* We do things differently when checking with regexp */
984     if (g_match) {
985 flameeyes 1.198 return rematch(symname, tomatch, REG_EXTENDED) == 0;
986 flameeyes 1.197 } else {
987     const size_t symname_len = strlen(symname);
988 flameeyes 1.198 return (strncmp(symname, tomatch, symname_len) == 0 &&
989     /* Accept unversioned symbol names */
990     (tomatch[symname_len] == '\0' || tomatch[symname_len] == '@'));
991 flameeyes 1.197 }
992     }
993    
994 vapier 1.72 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
995 vapier 1.39 {
996 vapier 1.44 unsigned long i;
997 vapier 1.95 char *ret;
998 vapier 1.39 void *symtab_void, *strtab_void;
999 vapier 1.38
1000 vapier 1.41 if (!find_sym) return NULL;
1001 vapier 1.95 ret = find_sym;
1002 vapier 1.32
1003 vapier 1.77 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
1004 vapier 1.27
1005 vapier 1.39 if (symtab_void && strtab_void) {
1006 vapier 1.27 #define FIND_SYM(B) \
1007     if (elf->elf_class == ELFCLASS ## B) { \
1008     Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
1009     Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
1010     Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
1011 vapier 1.115 unsigned long cnt = EGET(symtab->sh_entsize); \
1012 vapier 1.27 char *symname; \
1013 vapier 1.115 if (cnt) \
1014     cnt = EGET(symtab->sh_size) / cnt; \
1015 vapier 1.27 for (i = 0; i < cnt; ++i) { \
1016 flameeyes 1.196 if ((void*)sym > (void*)elf->data_end) { \
1017 flameeyes 1.195 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1018     goto break_out; \
1019     } \
1020 vapier 1.27 if (sym->st_name) { \
1021 vapier 1.134 /* make sure the symbol name is in acceptable memory range */ \
1022 vapier 1.27 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
1023 vapier 1.115 if ((void*)symname > (void*)elf->data_end) { \
1024     warnf("%s: corrupt ELF symbols", elf->filename); \
1025 vapier 1.134 ++sym; \
1026 vapier 1.111 continue; \
1027     } \
1028 vapier 1.134 /* debug display ... show all symbols and some extra info */ \
1029 flameeyes 1.197 if (0 && g_match ? rematch(ret, symname, REG_EXTENDED) == 0 : *ret == '*') { \
1030 solar 1.177 printf("%s(%s) %5lX %15s %s %s\n", \
1031 vapier 1.39 ((*found_sym == 0) ? "\n\t" : "\t"), \
1032 vapier 1.76 elf->base_filename, \
1033 vapier 1.94 (unsigned long)sym->st_size, \
1034 vapier 1.95 get_elfstttype(sym->st_info), \
1035 solar 1.177 sym->st_shndx == SHN_UNDEF ? "U" : "D", symname); \
1036 vapier 1.39 *found_sym = 1; \
1037 vapier 1.95 } else { \
1038 vapier 1.134 /* allow the user to specify a comma delimited list of symbols to search for */ \
1039 flameeyes 1.198 char *this_sym, *next_sym; \
1040 flameeyes 1.197 next_sym = ret; \
1041     while (next_sym) { \
1042     this_sym = next_sym; \
1043     if ((next_sym = strchr(this_sym, ','))) \
1044 grobian 1.200 next_sym += 1; /* Skip the comma */ \
1045 vapier 1.134 /* do we want a defined symbol ? */ \
1046     if (*this_sym == '+') { \
1047 vapier 1.140 if (sym->st_shndx == SHN_UNDEF) \
1048 flameeyes 1.197 continue; \
1049 vapier 1.134 ++this_sym; \
1050     /* do we want an undefined symbol ? */ \
1051     } else if (*this_sym == '-') { \
1052 vapier 1.140 if (sym->st_shndx != SHN_UNDEF) \
1053 flameeyes 1.197 continue; \
1054 vapier 1.134 ++this_sym; \
1055     } \
1056 grobian 1.200 if (next_sym) /* Copy it so that we don't have to worry about the final , */ \
1057 grobian 1.208 this_sym = xstrndup(this_sym, next_sym-this_sym); \
1058 vapier 1.134 /* ok, lets compare the name now */ \
1059 flameeyes 1.198 if (scanelf_match_symname(this_sym, symname)) { \
1060 solar 1.132 if (be_semi_verbose) { \
1061     char buf[126]; \
1062     snprintf(buf, sizeof(buf), "%lX %s %s", \
1063     (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
1064     ret = buf; \
1065     } else \
1066 flameeyes 1.197 ret = symname; \
1067 vapier 1.95 (*found_sym)++; \
1068     goto break_out; \
1069     } \
1070 grobian 1.200 if (next_sym) free(this_sym); \
1071 flameeyes 1.197 } \
1072 vapier 1.95 } \
1073 vapier 1.27 } \
1074     ++sym; \
1075     } }
1076     FIND_SYM(32)
1077     FIND_SYM(64)
1078 vapier 1.39 }
1079 vapier 1.70
1080 vapier 1.95 break_out:
1081 solar 1.127 if (be_wewy_wewy_quiet) return NULL;
1082 vapier 1.70
1083 vapier 1.41 if (*find_sym != '*' && *found_sym)
1084 vapier 1.95 return ret;
1085 vapier 1.41 if (be_quiet)
1086     return NULL;
1087     else
1088 solar 1.68 return (char *)" - ";
1089 vapier 1.39 }
1090 solar 1.119
1091 solar 1.124 static char *scanelf_file_sections(elfobj *elf, char *found_section)
1092     {
1093     if (!find_section)
1094     return NULL;
1095    
1096     #define FIND_SECTION(B) \
1097     if (elf->elf_class == ELFCLASS ## B) { \
1098 solar 1.136 int invert; \
1099 solar 1.124 Elf ## B ## _Shdr *section; \
1100 solar 1.136 invert = (*find_section == '!' ? 1 : 0); \
1101     section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1102     if ((section == NULL && invert) || (section != NULL && !invert)) \
1103 solar 1.124 *found_section = 1; \
1104     }
1105     FIND_SECTION(32)
1106     FIND_SECTION(64)
1107    
1108 vapier 1.138 if (be_wewy_wewy_quiet)
1109     return NULL;
1110 solar 1.124
1111     if (*found_section)
1112     return find_section;
1113    
1114     if (be_quiet)
1115     return NULL;
1116     else
1117     return (char *)" - ";
1118     }
1119    
1120 vapier 1.39 /* scan an elf file and show all the fun stuff */
1121 vapier 1.210 #define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1122 vapier 1.106 static int scanelf_elfobj(elfobj *elf)
1123 vapier 1.39 {
1124 vapier 1.44 unsigned long i;
1125 vapier 1.162 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1126     found_rpath, found_needed, found_interp, found_bind, found_soname,
1127 solar 1.124 found_sym, found_lib, found_file, found_textrels, found_section;
1128 vapier 1.41 static char *out_buffer = NULL;
1129     static size_t out_len;
1130 vapier 1.39
1131 vapier 1.76 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1132 vapier 1.84 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1133 solar 1.124 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1134 vapier 1.39
1135 vapier 1.114 if (be_verbose > 2)
1136 vapier 1.106 printf("%s: scanning file {%s,%s}\n", elf->filename,
1137 vapier 1.69 get_elfeitype(EI_CLASS, elf->elf_class),
1138     get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1139 vapier 1.114 else if (be_verbose > 1)
1140 vapier 1.106 printf("%s: scanning file\n", elf->filename);
1141 vapier 1.39
1142 vapier 1.41 /* init output buffer */
1143     if (!out_buffer) {
1144     out_len = sizeof(char) * 80;
1145 vapier 1.186 out_buffer = xmalloc(out_len);
1146 vapier 1.41 }
1147     *out_buffer = '\0';
1148    
1149 vapier 1.39 /* show the header */
1150     if (!be_quiet && show_banner) {
1151 vapier 1.49 for (i = 0; out_format[i]; ++i) {
1152 vapier 1.70 if (!IS_MODIFIER(out_format[i])) continue;
1153 vapier 1.41
1154     switch (out_format[++i]) {
1155 solar 1.132 case '+': break;
1156 vapier 1.41 case '%': break;
1157 vapier 1.70 case '#': break;
1158 vapier 1.66 case 'F':
1159     case 'p':
1160     case 'f': prints("FILE "); found_file = 1; break;
1161 vapier 1.41 case 'o': prints(" TYPE "); break;
1162     case 'x': prints(" PAX "); break;
1163 vapier 1.71 case 'e': prints("STK/REL/PTL "); break;
1164 vapier 1.41 case 't': prints("TEXTREL "); break;
1165     case 'r': prints("RPATH "); break;
1166 vapier 1.171 case 'M': prints("CLASS "); break;
1167 vapier 1.41 case 'n': prints("NEEDED "); break;
1168     case 'i': prints("INTERP "); break;
1169 vapier 1.49 case 'b': prints("BIND "); break;
1170 solar 1.190 case 'Z': prints("SIZE "); break;
1171 vapier 1.84 case 'S': prints("SONAME "); break;
1172 vapier 1.41 case 's': prints("SYM "); break;
1173 vapier 1.72 case 'N': prints("LIB "); break;
1174 vapier 1.76 case 'T': prints("TEXTRELS "); break;
1175 vapier 1.126 case 'k': prints("SECTION "); break;
1176 vapier 1.166 case 'a': prints("ARCH "); break;
1177 solar 1.191 case 'I': prints("OSABI "); break;
1178     case 'Y': prints("EABI "); break;
1179 solar 1.180 case 'O': prints("PERM "); break;
1180 solar 1.181 case 'D': prints("ENDIAN "); break;
1181 vapier 1.76 default: warnf("'%c' has no title ?", out_format[i]);
1182 vapier 1.39 }
1183 vapier 1.27 }
1184 vapier 1.49 if (!found_file) prints("FILE ");
1185 vapier 1.41 prints("\n");
1186 vapier 1.49 found_file = 0;
1187 vapier 1.39 show_banner = 0;
1188     }
1189    
1190     /* dump all the good stuff */
1191 vapier 1.49 for (i = 0; out_format[i]; ++i) {
1192 vapier 1.41 const char *out;
1193 vapier 1.66 const char *tmp;
1194 solar 1.190 static char ubuf[sizeof(unsigned long)*2];
1195 vapier 1.70 if (!IS_MODIFIER(out_format[i])) {
1196 vapier 1.41 xchrcat(&out_buffer, out_format[i], &out_len);
1197     continue;
1198     }
1199 vapier 1.39
1200 vapier 1.41 out = NULL;
1201 solar 1.127 be_wewy_wewy_quiet = (out_format[i] == '#');
1202 solar 1.132 be_semi_verbose = (out_format[i] == '+');
1203 vapier 1.41 switch (out_format[++i]) {
1204 solar 1.132 case '+':
1205 vapier 1.70 case '%':
1206     case '#':
1207     xchrcat(&out_buffer, out_format[i], &out_len); break;
1208     case 'F':
1209 vapier 1.76 found_file = 1;
1210 solar 1.127 if (be_wewy_wewy_quiet) break;
1211 vapier 1.106 xstrcat(&out_buffer, elf->filename, &out_len);
1212 vapier 1.70 break;
1213 vapier 1.66 case 'p':
1214 vapier 1.76 found_file = 1;
1215 solar 1.127 if (be_wewy_wewy_quiet) break;
1216 vapier 1.106 tmp = elf->filename;
1217 vapier 1.66 if (search_path) {
1218     ssize_t len_search = strlen(search_path);
1219 vapier 1.106 ssize_t len_file = strlen(elf->filename);
1220     if (!strncmp(elf->filename, search_path, len_search) && \
1221 vapier 1.66 len_file > len_search)
1222     tmp += len_search;
1223     if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1224     }
1225     xstrcat(&out_buffer, tmp, &out_len);
1226     break;
1227     case 'f':
1228 vapier 1.76 found_file = 1;
1229 solar 1.127 if (be_wewy_wewy_quiet) break;
1230 vapier 1.106 tmp = strrchr(elf->filename, '/');
1231     tmp = (tmp == NULL ? elf->filename : tmp+1);
1232 vapier 1.66 xstrcat(&out_buffer, tmp, &out_len);
1233     break;
1234 vapier 1.41 case 'o': out = get_elfetype(elf); break;
1235     case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1236 solar 1.73 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1237 vapier 1.41 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1238 vapier 1.79 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1239 vapier 1.41 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1240 vapier 1.171 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1241 solar 1.181 case 'D': out = get_endian(elf); break;
1242 vapier 1.206 case 'O': out = strfileperms(elf->filename); break;
1243 vapier 1.72 case 'n':
1244     case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1245 vapier 1.41 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1246 vapier 1.49 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1247 vapier 1.84 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1248 vapier 1.72 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1249 solar 1.124 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1250 vapier 1.166 case 'a': out = get_elfemtype(elf); break;
1251 solar 1.191 case 'I': out = get_elfosabi(elf); break;
1252     case 'Y': out = get_elf_eabi(elf); break;
1253 vapier 1.193 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1254 vapier 1.76 default: warnf("'%c' has no scan code?", out_format[i]);
1255 vapier 1.29 }
1256 vapier 1.95 if (out) {
1257     /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1258     if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1259     xstrncat(&out_buffer, out, &out_len, (tmp-out));
1260     else
1261     xstrcat(&out_buffer, out, &out_len);
1262     }
1263 vapier 1.39 }
1264    
1265 vapier 1.54 #define FOUND_SOMETHING() \
1266 solar 1.73 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1267 vapier 1.76 found_rpath || found_needed || found_interp || found_bind || \
1268 solar 1.124 found_soname || found_sym || found_lib || found_textrels || found_section )
1269 vapier 1.54
1270     if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1271     xchrcat(&out_buffer, ' ', &out_len);
1272 vapier 1.106 xstrcat(&out_buffer, elf->filename, &out_len);
1273 vapier 1.27 }
1274 vapier 1.79 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1275 vapier 1.41 puts(out_buffer);
1276 vapier 1.79 fflush(stdout);
1277     }
1278 vapier 1.10
1279 vapier 1.105 return 0;
1280     }
1281    
1282 vapier 1.106 /* scan a single elf */
1283     static int scanelf_elf(const char *filename, int fd, size_t len)
1284     {
1285 solar 1.120 int ret = 1;
1286 vapier 1.106 elfobj *elf;
1287    
1288     /* verify this is real ELF */
1289     if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1290     if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1291 solar 1.120 return ret;
1292     }
1293     switch (match_bits) {
1294     case 32:
1295     if (elf->elf_class != ELFCLASS32)
1296     goto label_done;
1297     break;
1298     case 64:
1299     if (elf->elf_class != ELFCLASS64)
1300     goto label_done;
1301     break;
1302     default: break;
1303 vapier 1.106 }
1304 solar 1.119 if (strlen(match_etypes)) {
1305     char sbuf[126];
1306     strncpy(sbuf, match_etypes, sizeof(sbuf));
1307     if (strchr(match_etypes, ',') != NULL) {
1308     char *p;
1309 vapier 1.186 while ((p = strrchr(sbuf, ',')) != NULL) {
1310 solar 1.119 *p = 0;
1311 solar 1.129 if (etype_lookup(p+1) == get_etype(elf))
1312 solar 1.119 goto label_ret;
1313     }
1314     }
1315 solar 1.129 if (etype_lookup(sbuf) != get_etype(elf))
1316 solar 1.119 goto label_done;
1317     }
1318    
1319     label_ret:
1320 vapier 1.106 ret = scanelf_elfobj(elf);
1321 solar 1.119
1322     label_done:
1323 vapier 1.106 unreadelf(elf);
1324     return ret;
1325     }
1326 solar 1.119
1327 vapier 1.105 /* scan an archive of elfs */
1328 vapier 1.106 static int scanelf_archive(const char *filename, int fd, size_t len)
1329 vapier 1.105 {
1330 vapier 1.106 archive_handle *ar;
1331 vapier 1.105 archive_member *m;
1332 vapier 1.106 char *ar_buffer;
1333     elfobj *elf;
1334    
1335     ar = ar_open_fd(filename, fd);
1336     if (ar == NULL)
1337     return 1;
1338    
1339 vapier 1.201 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1340 vapier 1.106 while ((m=ar_next(ar)) != NULL) {
1341     elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1342     if (elf) {
1343     scanelf_elfobj(elf);
1344     unreadelf(elf);
1345     }
1346     }
1347     munmap(ar_buffer, len);
1348    
1349 vapier 1.105 return 0;
1350     }
1351     /* scan a file which may be an elf or an archive or some other magical beast */
1352 solar 1.164 static int scanelf_file(const char *filename, const struct stat *st_cache)
1353 vapier 1.105 {
1354 vapier 1.161 const struct stat *st = st_cache;
1355     struct stat symlink_st;
1356 vapier 1.106 int fd;
1357 vapier 1.105
1358     /* always handle regular files and handle symlinked files if no -y */
1359 vapier 1.161 if (S_ISLNK(st->st_mode)) {
1360 solar 1.164 if (!scan_symlink) return 1;
1361 vapier 1.161 stat(filename, &symlink_st);
1362     st = &symlink_st;
1363 vapier 1.105 }
1364 vapier 1.161
1365     if (!S_ISREG(st->st_mode)) {
1366 vapier 1.105 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1367 solar 1.164 return 1;
1368 vapier 1.105 }
1369    
1370 solar 1.180 if (match_perms) {
1371     if ((st->st_mode | match_perms) != st->st_mode)
1372     return 1;
1373     }
1374 vapier 1.106 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1375 solar 1.164 return 1;
1376 vapier 1.106
1377 vapier 1.161 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1378 vapier 1.105 /* if it isn't an ELF, maybe it's an .a archive */
1379 vapier 1.161 scanelf_archive(filename, fd, st->st_size);
1380 vapier 1.106
1381     close(fd);
1382 solar 1.164 return 0;
1383 solar 1.6 }
1384    
1385 solar 1.1 /* scan a directory for ET_EXEC files and print when we find one */
1386 solar 1.164 static int scanelf_dir(const char *path)
1387 solar 1.1 {
1388 vapier 1.10 register DIR *dir;
1389     register struct dirent *dentry;
1390 vapier 1.14 struct stat st_top, st;
1391 vapier 1.104 char buf[__PAX_UTILS_PATH_MAX];
1392 vapier 1.32 size_t pathlen = 0, len = 0;
1393 solar 1.164 int ret = 0;
1394 vapier 1.10
1395     /* make sure path exists */
1396 vapier 1.39 if (lstat(path, &st_top) == -1) {
1397     if (be_verbose > 2) printf("%s: does not exist\n", path);
1398 solar 1.164 return 1;
1399 vapier 1.39 }
1400 solar 1.11
1401 vapier 1.10 /* ok, if it isn't a directory, assume we can open it */
1402 vapier 1.14 if (!S_ISDIR(st_top.st_mode)) {
1403 solar 1.164 return scanelf_file(path, &st_top);
1404 vapier 1.10 }
1405    
1406     /* now scan the dir looking for fun stuff */
1407     if ((dir = opendir(path)) == NULL) {
1408     warnf("could not opendir %s: %s", path, strerror(errno));
1409 solar 1.164 return 1;
1410 vapier 1.10 }
1411 vapier 1.114 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1412 solar 1.11
1413 vapier 1.32 pathlen = strlen(path);
1414 vapier 1.10 while ((dentry = readdir(dir))) {
1415     if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1416     continue;
1417 vapier 1.32 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1418     if (len >= sizeof(buf)) {
1419 vapier 1.76 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1420     (unsigned long)len, (unsigned long)sizeof(buf));
1421 vapier 1.32 continue;
1422     }
1423 solar 1.143 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1424 solar 1.20 if (lstat(buf, &st) != -1) {
1425 vapier 1.10 if (S_ISREG(st.st_mode))
1426 solar 1.164 ret = scanelf_file(buf, &st);
1427 vapier 1.10 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1428 vapier 1.14 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1429 solar 1.164 ret = scanelf_dir(buf);
1430 vapier 1.10 }
1431     }
1432     }
1433     closedir(dir);
1434 solar 1.164 return ret;
1435 solar 1.1 }
1436    
1437 vapier 1.133 static int scanelf_from_file(const char *filename)
1438 vapier 1.47 {
1439 solar 1.45 FILE *fp = NULL;
1440     char *p;
1441 vapier 1.104 char path[__PAX_UTILS_PATH_MAX];
1442 solar 1.164 int ret = 0;
1443 solar 1.45
1444 solar 1.132 if (strcmp(filename, "-") == 0)
1445 solar 1.45 fp = stdin;
1446     else if ((fp = fopen(filename, "r")) == NULL)
1447     return 1;
1448    
1449 vapier 1.104 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1450 solar 1.45 if ((p = strchr(path, '\n')) != NULL)
1451     *p = 0;
1452 vapier 1.66 search_path = path;
1453 solar 1.164 ret = scanelf_dir(path);
1454 solar 1.45 }
1455     if (fp != stdin)
1456     fclose(fp);
1457 solar 1.164 return ret;
1458 solar 1.45 }
1459    
1460 solar 1.154 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1461 vapier 1.148
1462     static int load_ld_cache_config(int i, const char *fname)
1463 vapier 1.48 {
1464     FILE *fp = NULL;
1465     char *p;
1466 vapier 1.104 char path[__PAX_UTILS_PATH_MAX];
1467 vapier 1.48
1468 vapier 1.149 if (i + 1 == ARRAY_SIZE(ldpaths))
1469 solar 1.123 return i;
1470    
1471     if ((fp = fopen(fname, "r")) == NULL)
1472     return i;
1473 vapier 1.48
1474 vapier 1.104 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1475 vapier 1.48 if ((p = strrchr(path, '\r')) != NULL)
1476     *p = 0;
1477     if ((p = strchr(path, '\n')) != NULL)
1478     *p = 0;
1479 solar 1.154 #ifdef __linux__
1480 vapier 1.186 /* recursive includes of the same file will make this segfault. */
1481 solar 1.129 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1482 solar 1.123 glob64_t gl;
1483     size_t x;
1484     char gpath[__PAX_UTILS_PATH_MAX];
1485    
1486 solar 1.129 memset(gpath, 0, sizeof(gpath));
1487 solar 1.123
1488     if (path[8] != '/')
1489 solar 1.129 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1490 solar 1.123 else
1491 solar 1.129 strncpy(gpath, &path[8], sizeof(gpath));
1492 solar 1.123
1493     if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1494     for (x = 0; x < gl.gl_pathc; ++x) {
1495     /* try to avoid direct loops */
1496     if (strcmp(gl.gl_pathv[x], fname) == 0)
1497     continue;
1498 vapier 1.148 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1499 vapier 1.149 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1500 solar 1.123 globfree64(&gl);
1501     return i;
1502     }
1503     }
1504     globfree64 (&gl);
1505     continue;
1506 solar 1.160 }
1507 solar 1.123 }
1508 solar 1.154 #endif
1509 solar 1.123 if (*path != '/')
1510     continue;
1511 vapier 1.48
1512     ldpaths[i++] = xstrdup(path);
1513    
1514 vapier 1.149 if (i + 1 == ARRAY_SIZE(ldpaths))
1515 vapier 1.48 break;
1516     }
1517     ldpaths[i] = NULL;
1518    
1519     fclose(fp);
1520 solar 1.123 return i;
1521 vapier 1.48 }
1522 flameeyes 1.141
1523 vapier 1.211 #elif defined(__FreeBSD__) || defined(__DragonFly__)
1524 vapier 1.148
1525     static int load_ld_cache_config(int i, const char *fname)
1526 flameeyes 1.141 {
1527     FILE *fp = NULL;
1528     char *b = NULL, *p;
1529     struct elfhints_hdr hdr;
1530 vapier 1.152
1531 vapier 1.149 if (i + 1 == ARRAY_SIZE(ldpaths))
1532 flameeyes 1.141 return i;
1533    
1534     if ((fp = fopen(fname, "r")) == NULL)
1535     return i;
1536    
1537 vapier 1.152 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1538     hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1539     fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1540     {
1541 flameeyes 1.141 fclose(fp);
1542     return i;
1543     }
1544 vapier 1.152
1545 vapier 1.186 b = xmalloc(hdr.dirlistlen + 1);
1546 vapier 1.152 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1547 flameeyes 1.141 fclose(fp);
1548     free(b);
1549     return i;
1550     }
1551 vapier 1.152
1552     while ((p = strsep(&b, ":"))) {
1553     if (*p == '\0') continue;
1554 flameeyes 1.141 ldpaths[i++] = xstrdup(p);
1555 vapier 1.152
1556 vapier 1.149 if (i + 1 == ARRAY_SIZE(ldpaths))
1557 flameeyes 1.141 break;
1558     }
1559     ldpaths[i] = NULL;
1560 vapier 1.157
1561 flameeyes 1.141 free(b);
1562     fclose(fp);
1563     return i;
1564     }
1565 vapier 1.148
1566     #else
1567 vapier 1.192 #ifdef __ELF__
1568 vapier 1.148 #warning Cache config support not implemented for your target
1569 vapier 1.192 #endif
1570 vapier 1.148 static int load_ld_cache_config(int i, const char *fname)
1571     {
1572     memset(ldpaths, 0x00, sizeof(ldpaths));
1573 vapier 1.192 return 0;
1574 vapier 1.148 }
1575 flameeyes 1.141 #endif
1576 vapier 1.48
1577 vapier 1.10 /* scan /etc/ld.so.conf for paths */
1578 vapier 1.184 static void scanelf_ldpath(void)
1579 vapier 1.10 {
1580 vapier 1.17 char scan_l, scan_ul, scan_ull;
1581 vapier 1.48 int i = 0;
1582 vapier 1.10
1583 vapier 1.48 if (!ldpaths[0])
1584     err("Unable to load any paths from ld.so.conf");
1585 vapier 1.10
1586 vapier 1.17 scan_l = scan_ul = scan_ull = 0;
1587    
1588 vapier 1.48 while (ldpaths[i]) {
1589 vapier 1.211 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1590     if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1591 vapier 1.48 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1592     scanelf_dir(ldpaths[i]);
1593     ++i;
1594     }
1595 vapier 1.10
1596 vapier 1.17 if (!scan_l) scanelf_dir("/lib");
1597     if (!scan_ul) scanelf_dir("/usr/lib");
1598     if (!scan_ull) scanelf_dir("/usr/local/lib");
1599 vapier 1.10 }
1600 solar 1.1
1601 vapier 1.10 /* scan env PATH for paths */
1602 vapier 1.184 static void scanelf_envpath(void)
1603 solar 1.1 {
1604 solar 1.34 char *path, *p;
1605 vapier 1.10
1606     path = getenv("PATH");
1607     if (!path)
1608     err("PATH is not set in your env !");
1609 vapier 1.41 path = xstrdup(path);
1610 vapier 1.10
1611     while ((p = strrchr(path, ':')) != NULL) {
1612     scanelf_dir(p + 1);
1613     *p = 0;
1614     }
1615 vapier 1.17
1616 solar 1.34 free(path);
1617 solar 1.1 }
1618    
1619 solar 1.191 /* usage / invocation handling functions */ /* Free Flags: c d j u w C G H J K P Q U W */
1620     #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZBhV"
1621 vapier 1.27 #define a_argument required_argument
1622 vapier 1.10 static struct option const long_opts[] = {
1623     {"path", no_argument, NULL, 'p'},
1624     {"ldpath", no_argument, NULL, 'l'},
1625     {"recursive", no_argument, NULL, 'R'},
1626 vapier 1.14 {"mount", no_argument, NULL, 'm'},
1627 vapier 1.37 {"symlink", no_argument, NULL, 'y'},
1628 vapier 1.105 {"archives", no_argument, NULL, 'A'},
1629     {"ldcache", no_argument, NULL, 'L'},
1630 vapier 1.101 {"fix", no_argument, NULL, 'X'},
1631 solar 1.127 {"setpax", a_argument, NULL, 'z'},
1632 vapier 1.10 {"pax", no_argument, NULL, 'x'},
1633 solar 1.16 {"header", no_argument, NULL, 'e'},
1634 vapier 1.10 {"textrel", no_argument, NULL, 't'},
1635     {"rpath", no_argument, NULL, 'r'},
1636 vapier 1.32 {"needed", no_argument, NULL, 'n'},
1637 vapier 1.38 {"interp", no_argument, NULL, 'i'},
1638 vapier 1.49 {"bind", no_argument, NULL, 'b'},
1639 vapier 1.84 {"soname", no_argument, NULL, 'S'},
1640 vapier 1.76 {"symbol", a_argument, NULL, 's'},
1641 solar 1.124 {"section", a_argument, NULL, 'k'},
1642 vapier 1.76 {"lib", a_argument, NULL, 'N'},
1643 solar 1.86 {"gmatch", no_argument, NULL, 'g'},
1644 vapier 1.76 {"textrels", no_argument, NULL, 'T'},
1645 solar 1.119 {"etype", a_argument, NULL, 'E'},
1646 solar 1.120 {"bits", a_argument, NULL, 'M'},
1647 solar 1.181 {"endian", no_argument, NULL, 'D'},
1648 solar 1.191 {"osabi", no_argument, NULL, 'I'},
1649     {"eabi", no_argument, NULL, 'Y'},
1650 solar 1.180 {"perms", a_argument, NULL, 'O'},
1651 solar 1.190 {"size", no_argument, NULL, 'Z'},
1652 vapier 1.10 {"all", no_argument, NULL, 'a'},
1653     {"quiet", no_argument, NULL, 'q'},
1654 vapier 1.14 {"verbose", no_argument, NULL, 'v'},
1655 vapier 1.76 {"format", a_argument, NULL, 'F'},
1656     {"from", a_argument, NULL, 'f'},
1657     {"file", a_argument, NULL, 'o'},
1658 solar 1.16 {"nobanner", no_argument, NULL, 'B'},
1659 vapier 1.10 {"help", no_argument, NULL, 'h'},
1660     {"version", no_argument, NULL, 'V'},
1661     {NULL, no_argument, NULL, 0x0}
1662     };
1663 solar 1.57
1664 solar 1.68 static const char *opts_help[] = {
1665 vapier 1.10 "Scan all directories in PATH environment",
1666     "Scan all directories in /etc/ld.so.conf",
1667 vapier 1.14 "Scan directories recursively",
1668 vapier 1.37 "Don't recursively cross mount points",
1669 vapier 1.101 "Don't scan symlinks",
1670 vapier 1.105 "Scan archives (.a files)",
1671     "Utilize ld.so.cache information (use with -r/-n)",
1672 solar 1.127 "Try and 'fix' bad things (use with -r/-e)",
1673     "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1674 vapier 1.10 "Print PaX markings",
1675 vapier 1.71 "Print GNU_STACK/PT_LOAD markings",
1676 vapier 1.10 "Print TEXTREL information",
1677     "Print RPATH information",
1678 vapier 1.32 "Print NEEDED information",
1679 vapier 1.38 "Print INTERP information",
1680 vapier 1.49 "Print BIND information",
1681 vapier 1.84 "Print SONAME information",
1682 vapier 1.27 "Find a specified symbol",
1683 solar 1.124 "Find a specified section",
1684 vapier 1.72 "Find a specified library",
1685 solar 1.86 "Use strncmp to match libraries. (use with -N)",
1686 vapier 1.76 "Locate cause of TEXTREL",
1687 solar 1.129 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1688 solar 1.120 "Print only ELF files matching numeric bits",
1689 solar 1.181 "Print Endianness",
1690 solar 1.191 "Print OSABI",
1691     "Print EABI (EM_ARM Only)",
1692 solar 1.180 "Print only ELF files matching octal permissions",
1693 solar 1.190 "Print ELF file size",
1694 vapier 1.82 "Print all scanned info (-x -e -t -r -b)\n",
1695 vapier 1.14 "Only output 'bad' things",
1696     "Be verbose (can be specified more than once)",
1697 vapier 1.39 "Use specified format for output",
1698 solar 1.45 "Read input stream from a filename",
1699 vapier 1.24 "Write output stream to a filename",
1700 vapier 1.14 "Don't display the header",
1701 vapier 1.10 "Print this help and exit",
1702     "Print version and exit",
1703     NULL
1704     };
1705    
1706     /* display usage and exit */
1707     static void usage(int status)
1708 solar 1.1 {
1709 vapier 1.44 unsigned long i;
1710 solar 1.52 printf("* Scan ELF binaries for stuff\n\n"
1711 vapier 1.105 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1712 solar 1.35 printf("Options: -[%s]\n", PARSE_FLAGS);
1713 vapier 1.10 for (i = 0; long_opts[i].name; ++i)
1714 vapier 1.27 if (long_opts[i].has_arg == no_argument)
1715 vapier 1.157 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1716 vapier 1.27 long_opts[i].name, opts_help[i]);
1717     else
1718 solar 1.124 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1719 vapier 1.27 long_opts[i].name, opts_help[i]);
1720 solar 1.45
1721 vapier 1.173 puts("\nFor more information, see the scanelf(1) manpage");
1722 vapier 1.10 exit(status);
1723 solar 1.1 }
1724    
1725     /* parse command line arguments and preform needed actions */
1726 vapier 1.165 #define do_pax_state(option, flag) \
1727     if (islower(option)) { \
1728     flags &= ~PF_##flag; \
1729     flags |= PF_NO##flag; \
1730     } else { \
1731     flags &= ~PF_NO##flag; \
1732     flags |= PF_##flag; \
1733     }
1734 solar 1.164 static int parseargs(int argc, char *argv[])
1735 vapier 1.10 {
1736 vapier 1.48 int i;
1737 vapier 1.133 const char *from_file = NULL;
1738 solar 1.164 int ret = 0;
1739 vapier 1.10
1740     opterr = 0;
1741 vapier 1.48 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1742     switch (i) {
1743 vapier 1.10
1744 vapier 1.39 case 'V':
1745 vapier 1.80 printf("pax-utils-%s: %s compiled %s\n%s\n"
1746     "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1747     VERSION, __FILE__, __DATE__, rcsid, argv0);
1748 vapier 1.10 exit(EXIT_SUCCESS);
1749     break;
1750     case 'h': usage(EXIT_SUCCESS); break;
1751 solar 1.45 case 'f':
1752 vapier 1.100 if (from_file) warn("You prob don't want to specify -f twice");
1753     from_file = optarg;
1754 solar 1.45 break;
1755 solar 1.119 case 'E':
1756     strncpy(match_etypes, optarg, sizeof(match_etypes));
1757     break;
1758 solar 1.120 case 'M':
1759     match_bits = atoi(optarg);
1760 solar 1.182 if (match_bits == 0) {
1761     if (strcmp(optarg, "ELFCLASS32") == 0)
1762     match_bits = 32;
1763     if (strcmp(optarg, "ELFCLASS64") == 0)
1764     match_bits = 64;
1765     }
1766 solar 1.120 break;
1767 solar 1.180 case 'O':
1768 vapier 1.205 if (sscanf(optarg, "%o", &match_perms) == -1)
1769 solar 1.180 match_bits = 0;
1770     break;
1771 vapier 1.24 case 'o': {
1772 vapier 1.146 if (freopen(optarg, "w", stdout) == NULL)
1773 vapier 1.24 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1774 solar 1.21 break;
1775     }
1776 solar 1.124 case 'k':
1777 vapier 1.126 if (find_section) warn("You prob don't want to specify -k twice");
1778 solar 1.124 find_section = optarg;
1779     break;
1780 vapier 1.39 case 's': {
1781 vapier 1.93 if (find_sym) warn("You prob don't want to specify -s twice");
1782     find_sym = optarg;
1783 vapier 1.39 break;
1784     }
1785 vapier 1.72 case 'N': {
1786 vapier 1.93 if (find_lib) warn("You prob don't want to specify -N twice");
1787     find_lib = optarg;
1788 vapier 1.72 break;
1789     }
1790 vapier 1.39
1791     case 'F': {
1792 vapier 1.93 if (out_format) warn("You prob don't want to specify -F twice");
1793     out_format = optarg;
1794 vapier 1.39 break;
1795     }
1796 solar 1.127 case 'z': {
1797 solar 1.129 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1798 solar 1.127 size_t x;
1799 vapier 1.27
1800 vapier 1.186 for (x = 0; x < strlen(optarg); x++) {
1801     switch (optarg[x]) {
1802 solar 1.127 case 'p':
1803     case 'P':
1804 vapier 1.165 do_pax_state(optarg[x], PAGEEXEC);
1805 solar 1.127 break;
1806     case 's':
1807     case 'S':
1808 vapier 1.165 do_pax_state(optarg[x], SEGMEXEC);
1809 solar 1.127 break;
1810     case 'm':
1811     case 'M':
1812 vapier 1.165 do_pax_state(optarg[x], MPROTECT);
1813 solar 1.127 break;
1814     case 'e':
1815     case 'E':
1816 vapier 1.165 do_pax_state(optarg[x], EMUTRAMP);
1817 solar 1.127 break;
1818     case 'r':
1819     case 'R':
1820 vapier 1.165 do_pax_state(optarg[x], RANDMMAP);
1821 solar 1.127 break;
1822     case 'x':
1823     case 'X':
1824 vapier 1.165 do_pax_state(optarg[x], RANDEXEC);
1825 solar 1.127 break;
1826     default:
1827     break;
1828     }
1829     }
1830     if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1831     ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1832     ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1833     ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1834     ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1835     ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1836     setpax = flags;
1837     break;
1838     }
1839 solar 1.190 case 'Z': show_size = 1; break;
1840 solar 1.176 case 'g': g_match = 1; break;
1841 vapier 1.102 case 'L': use_ldcache = 1; break;
1842 vapier 1.37 case 'y': scan_symlink = 0; break;
1843 vapier 1.105 case 'A': scan_archives = 1; break;
1844 solar 1.16 case 'B': show_banner = 0; break;
1845 vapier 1.10 case 'l': scan_ldpath = 1; break;
1846     case 'p': scan_envpath = 1; break;
1847     case 'R': dir_recurse = 1; break;
1848 vapier 1.14 case 'm': dir_crossmount = 0; break;
1849 vapier 1.101 case 'X': ++fix_elf; break;
1850 vapier 1.10 case 'x': show_pax = 1; break;
1851 solar 1.73 case 'e': show_phdr = 1; break;
1852 vapier 1.10 case 't': show_textrel = 1; break;
1853     case 'r': show_rpath = 1; break;
1854 vapier 1.32 case 'n': show_needed = 1; break;
1855 vapier 1.38 case 'i': show_interp = 1; break;
1856 vapier 1.49 case 'b': show_bind = 1; break;
1857 vapier 1.84 case 'S': show_soname = 1; break;
1858 vapier 1.76 case 'T': show_textrels = 1; break;
1859 vapier 1.10 case 'q': be_quiet = 1; break;
1860 vapier 1.14 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1861 solar 1.183 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1862 solar 1.181 case 'D': show_endian = 1; break;
1863 solar 1.191 case 'I': show_osabi = 1; break;
1864     case 'Y': show_eabi = 1; break;
1865 vapier 1.10 case ':':
1866 vapier 1.113 err("Option '%c' is missing parameter", optopt);
1867 vapier 1.10 case '?':
1868 solar 1.119 err("Unknown option '%c' or argument missing", optopt);
1869 vapier 1.10 default:
1870 vapier 1.113 err("Unhandled option '%c'; please report this", i);
1871 vapier 1.10 }
1872     }
1873 solar 1.170 if (show_textrels && be_verbose) {
1874     if (which("objdump") != NULL)
1875     has_objdump = 1;
1876     }
1877 vapier 1.39 /* let the format option override all other options */
1878     if (out_format) {
1879 solar 1.73 show_pax = show_phdr = show_textrel = show_rpath = \
1880 vapier 1.84 show_needed = show_interp = show_bind = show_soname = \
1881 solar 1.191 show_textrels = show_perms = show_endian = show_size = \
1882     show_osabi = show_eabi = 0;
1883 vapier 1.48 for (i = 0; out_format[i]; ++i) {
1884 vapier 1.70 if (!IS_MODIFIER(out_format[i])) continue;
1885 vapier 1.39
1886 vapier 1.48 switch (out_format[++i]) {
1887 solar 1.132 case '+': break;
1888 vapier 1.39 case '%': break;
1889 vapier 1.70 case '#': break;
1890 vapier 1.39 case 'F': break;
1891 vapier 1.66 case 'p': break;
1892     case 'f': break;
1893 solar 1.124 case 'k': break;
1894 vapier 1.39 case 's': break;
1895 vapier 1.72 case 'N': break;
1896 vapier 1.41 case 'o': break;
1897 vapier 1.166 case 'a': break;
1898 vapier 1.171 case 'M': break;
1899 solar 1.190 case 'Z': show_size = 1; break;
1900 solar 1.181 case 'D': show_endian = 1; break;
1901 solar 1.191 case 'I': show_osabi = 1; break;
1902     case 'Y': show_eabi = 1; break;
1903 solar 1.180 case 'O': show_perms = 1; break;
1904 vapier 1.39 case 'x': show_pax = 1; break;
1905 solar 1.73 case 'e': show_phdr = 1; break;
1906 vapier 1.39 case 't': show_textrel = 1; break;
1907     case 'r': show_rpath = 1; break;
1908     case 'n': show_needed = 1; break;
1909     case 'i': show_interp = 1; break;
1910 vapier 1.49 case 'b': show_bind = 1; break;
1911 vapier 1.84 case 'S': show_soname = 1; break;
1912 vapier 1.76 case 'T': show_textrels = 1; break;
1913 vapier 1.39 default:
1914 vapier 1.162 err("Invalid format specifier '%c' (byte %i)",
1915 vapier 1.48 out_format[i], i+1);
1916 vapier 1.39 }
1917     }
1918 vapier 1.41
1919     /* construct our default format */
1920     } else {
1921     size_t fmt_len = 30;
1922 vapier 1.186 out_format = xmalloc(sizeof(char) * fmt_len);
1923 vapier 1.194 *out_format = '\0';
1924 vapier 1.76 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1925     if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1926 solar 1.180 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
1927 solar 1.190 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
1928 solar 1.181 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
1929 solar 1.191 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
1930     if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1931 vapier 1.76 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1932     if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1933     if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1934     if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1935     if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1936     if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1937 vapier 1.84 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1938 vapier 1.76 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1939     if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1940 solar 1.124 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1941 vapier 1.76 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1942     if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1943 vapier 1.39 }
1944 vapier 1.41 if (be_verbose > 2) printf("Format: %s\n", out_format);
1945 vapier 1.39
1946     /* now lets actually do the scanning */
1947 vapier 1.102 if (scan_ldpath || use_ldcache)
1948 vapier 1.148 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1949 vapier 1.10 if (scan_ldpath) scanelf_ldpath();
1950     if (scan_envpath) scanelf_envpath();
1951 solar 1.153 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1952 vapier 1.133 from_file = "-";
1953 solar 1.45 if (from_file) {
1954     scanelf_from_file(from_file);
1955     from_file = *argv;
1956     }
1957     if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1958 vapier 1.25 err("Nothing to scan !?");
1959 vapier 1.66 while (optind < argc) {
1960     search_path = argv[optind++];
1961 solar 1.164 ret = scanelf_dir(search_path);
1962 vapier 1.66 }
1963 vapier 1.27
1964 vapier 1.39 /* clean up */
1965 vapier 1.48 for (i = 0; ldpaths[i]; ++i)
1966     free(ldpaths[i]);
1967 solar 1.96
1968     if (ldcache != 0)
1969     munmap(ldcache, ldcache_size);
1970 solar 1.164 return ret;
1971 vapier 1.10 }
1972    
1973 vapier 1.150 static char **get_split_env(const char *envvar)
1974     {
1975 vapier 1.152 const char *delims = " \t\n";
1976 solar 1.143 char **envvals = NULL;
1977 vapier 1.152 char *env, *s;
1978 kevquinn 1.142 int nentry;
1979    
1980 solar 1.143 if ((env = getenv(envvar)) == NULL)
1981     return NULL;
1982 kevquinn 1.142
1983 solar 1.143 env = xstrdup(env);
1984     if (env == NULL)
1985     return NULL;
1986 kevquinn 1.142
1987 vapier 1.152 s = strtok(env, delims);
1988     if (s == NULL) {
1989     free(env);
1990     return NULL;
1991     }
1992    
1993 solar 1.143 nentry = 0;
1994 vapier 1.152 while (s != NULL) {
1995     ++nentry;
1996     envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1997     envvals[nentry-1] = s;
1998     s = strtok(NULL, delims);
1999 kevquinn 1.142 }
2000 vapier 1.152 envvals[nentry] = NULL;
2001 kevquinn 1.142
2002 vapier 1.152 /* don't want to free(env) as it contains the memory that backs
2003     * the envvals array of strings */
2004 kevquinn 1.142 return envvals;
2005     }
2006 solar 1.181
2007 vapier 1.184 static void parseenv(void)
2008 vapier 1.150 {
2009     qa_textrels = get_split_env("QA_TEXTRELS");
2010     qa_execstack = get_split_env("QA_EXECSTACK");
2011     qa_wx_load = get_split_env("QA_WX_LOAD");
2012 vapier 1.41 }
2013 solar 1.163
2014 vapier 1.152 #ifdef __PAX_UTILS_CLEANUP
2015 vapier 1.184 static void cleanup(void)
2016 vapier 1.152 {
2017     free(out_format);
2018     free(qa_textrels);
2019     free(qa_execstack);
2020     free(qa_wx_load);
2021     }
2022     #endif
2023 vapier 1.41
2024 vapier 1.10 int main(int argc, char *argv[])
2025 solar 1.1 {
2026 solar 1.164 int ret;
2027 vapier 1.10 if (argc < 2)
2028     usage(EXIT_FAILURE);
2029 kevquinn 1.142 parseenv();
2030 solar 1.164 ret = parseargs(argc, argv);
2031 solar 1.21 fclose(stdout);
2032 vapier 1.152 #ifdef __PAX_UTILS_CLEANUP
2033     cleanup();
2034     warn("The calls to add/delete heap should be off:\n"
2035     "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
2036     "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2037 solar 1.61 #endif
2038 solar 1.164 return ret;
2039 solar 1.1 }
2040 vapier 1.155
2041     /* Match filename against entries in matchlist, return TRUE
2042     * if the file is listed */
2043     static int file_matches_list(const char *filename, char **matchlist)
2044     {
2045     char **file;
2046     char *match;
2047     char buf[__PAX_UTILS_PATH_MAX];
2048    
2049     if (matchlist == NULL)
2050     return 0;
2051    
2052     for (file = matchlist; *file != NULL; file++) {
2053     if (search_path) {
2054     snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2055     match = buf;
2056     } else {
2057     match = *file;
2058     }
2059     if (fnmatch(match, filename, 0) == 0)
2060     return 1;
2061     }
2062     return 0;
2063     }

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