/[gentoo-projects]/pax-utils/scanelf.c
Gentoo

Diff of /pax-utils/scanelf.c

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

Revision 1.41 Revision 1.229
1/* 1/*
2 * Copyright 2003 Ned Ludd <solar@gentoo.org>
3 * Copyright 1999-2005 Gentoo Foundation 2 * Copyright 2003-2007 Gentoo Foundation
4 * Distributed under the terms of the GNU General Public License v2 3 * Distributed under the terms of the GNU General Public License v2
5 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.41 2005/05/06 01:01:42 vapier Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.229 2011/09/27 19:29:19 vapier Exp $
6 * 5 *
7 ******************************************************************** 6 * Copyright 2003-2007 Ned Ludd - <solar@gentoo.org>
8 * This program is free software; you can redistribute it and/or 7 * Copyright 2004-2007 Mike Frysinger - <vapier@gentoo.org>
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
21 * MA 02111-1307, USA.
22 */ 8 */
23 9
24#include <stdio.h> 10static const char *rcsid = "$Id: scanelf.c,v 1.229 2011/09/27 19:29:19 vapier Exp $";
25#include <stdlib.h> 11const char argv0[] = "scanelf";
26#include <sys/types.h>
27#define __USE_GNU
28#include <string.h>
29#include <errno.h>
30#include <unistd.h>
31#include <sys/stat.h>
32#include <dirent.h>
33#include <getopt.h>
34#include <assert.h>
35 12
36#include "paxelf.h" 13#include "paxinc.h"
37 14
38static const char *rcsid = "$Id: scanelf.c,v 1.41 2005/05/06 01:01:42 vapier Exp $"; 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
39#define argv0 "scanelf"
40
41
42 16
43/* prototypes */ 17/* prototypes */
44static void scanelf_file(const char *filename); 18static int file_matches_list(const char *filename, char **matchlist);
45static void scanelf_dir(const char *path);
46static void scanelf_ldpath();
47static void scanelf_envpath();
48static void usage(int status);
49static void parseargs(int argc, char *argv[]);
50static char *xstrdup(char *s);
51static void *xmalloc(size_t size);
52static void xstrcat(char **dst, const char *src, size_t *curr_len);
53static inline void xchrcat(char **dst, const char append, size_t *curr_len);
54static int xemptybuffer(const char *buff);
55 19
56/* variables to control behavior */ 20/* variables to control behavior */
21static char *match_etypes = NULL;
22static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
57static char scan_ldpath = 0; 23static char scan_ldpath = 0;
58static char scan_envpath = 0; 24static char scan_envpath = 0;
59static char scan_symlink = 1; 25static char scan_symlink = 1;
26static char scan_archives = 0;
60static char dir_recurse = 0; 27static char dir_recurse = 0;
61static char dir_crossmount = 1; 28static char dir_crossmount = 1;
62static char show_pax = 0; 29static char show_pax = 0;
30static char show_perms = 0;
63static char show_stack = 0; 31static char show_size = 0;
32static char show_phdr = 0;
64static char show_textrel = 0; 33static char show_textrel = 0;
65static char show_rpath = 0; 34static char show_rpath = 0;
66static char show_needed = 0; 35static char show_needed = 0;
67static char show_interp = 0; 36static char show_interp = 0;
37static char show_bind = 0;
38static char show_soname = 0;
39static char show_textrels = 0;
68static char show_banner = 1; 40static char show_banner = 1;
41static char show_endian = 0;
42static char show_osabi = 0;
43static char show_eabi = 0;
69static char be_quiet = 0; 44static char be_quiet = 0;
70static char be_verbose = 0; 45static char be_verbose = 0;
71static char *find_sym = NULL, *versioned_symname = NULL; 46static char be_wewy_wewy_quiet = 0;
47static char be_semi_verbose = 0;
48static char *find_sym = 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;
72static char *out_format = NULL; 53static char *out_format = NULL;
54static char *search_path = NULL;
55static char fix_elf = 0;
56static char g_match = 0;
57static char use_ldcache = 0;
73 58
59static char **qa_textrels = NULL;
60static char **qa_execstack = NULL;
61static char **qa_wx_load = NULL;
62static char *root;
74 63
64static int match_bits = 0;
65static unsigned int match_perms = 0;
66static void *ldcache = NULL;
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}
75 119
76/* sub-funcs for scanelf_file() */ 120/* sub-funcs for scanelf_file() */
121static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
122{
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
132#define GET_SYMTABS(B) \
133 if (elf->elf_class == ELFCLASS ## B) { \
134 if (symtab && dynsym) { \
135 Elf ## B ## _Shdr *esymtab = symtab; \
136 Elf ## B ## _Shdr *edynsym = dynsym; \
137 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
138 } else \
139 *sym = symtab ? symtab : dynsym; \
140 if (strtab && dynstr) { \
141 Elf ## B ## _Shdr *estrtab = strtab; \
142 Elf ## B ## _Shdr *edynstr = dynstr; \
143 *tab = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
144 } else \
145 *tab = strtab ? strtab : dynstr; \
146 }
147 GET_SYMTABS(32)
148 GET_SYMTABS(64)
149}
150
77static char *scanelf_file_pax(elfobj *elf, char *found_pax) 151static char *scanelf_file_pax(elfobj *elf, char *found_pax)
78{ 152{
79 static char *paxflags; 153 static char ret[7];
154 unsigned long i, shown;
80 155
81 if (!show_pax) return NULL; 156 if (!show_pax) return NULL;
82 157
83 paxflags = pax_short_hf_flags(PAX_FLAGS(elf));
84 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) {
85 *found_pax = 1;
86 return paxflags;
87 }
88
89 return NULL;
90}
91static char *scanelf_file_stack(elfobj *elf, char *found_stack, char *found_relro)
92{
93 static char ret[7];
94 char *found;
95 int i, off, shown;
96
97 if (!show_stack) return NULL;
98
99 shown = 0; 158 shown = 0;
100 sprintf(ret, "--- ---"); 159 memset(&ret, 0, sizeof(ret));
160
161 if (elf->phdr) {
101#define SHOW_STACK(B) \ 162#define SHOW_PAX(B) \
102 if (elf->elf_class == ELFCLASS ## B) { \ 163 if (elf->elf_class == ELFCLASS ## B) { \
103 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 164 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
104 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 165 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
105 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 166 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
106 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 167 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
107 found = found_stack; \
108 off = 0; \
109 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
110 found = found_relro; \
111 off = 3; \
112 } else \
113 continue; \ 168 continue; \
114 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ 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+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \ 175 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
117 *found = 1; \ 176 *found_pax = 1; \
118 ++shown; \ 177 ++shown; \
178 break; \
119 } \ 179 } \
120 } 180 }
121 SHOW_STACK(32) 181 SHOW_PAX(32)
122 SHOW_STACK(64) 182 SHOW_PAX(64)
123 if (be_quiet && !shown) 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 }
194 }
195
196 /* fall back to EI_PAX if no PT_PAX was found */
197 if (!*ret) {
198 static char *paxflags;
199 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
200 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
201 *found_pax = 1;
202 return (be_wewy_wewy_quiet ? NULL : paxflags);
203 }
204 strncpy(ret, paxflags, sizeof(ret));
205 }
206
207 if (be_wewy_wewy_quiet || (be_quiet && !shown))
124 return NULL; 208 return NULL;
125 else 209 else
126 return ret; 210 return ret;
127} 211}
212
213static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
214{
215 static char ret[12];
216 char *found;
217 unsigned long i, shown, multi_stack, multi_relro, multi_load;
218 int max_pt_load;
219
220 if (!show_phdr) return NULL;
221
222 memcpy(ret, "--- --- ---\0", 12);
223
224 shown = 0;
225 multi_stack = multi_relro = multi_load = 0;
226 max_pt_load = elf_max_pt_load(elf);
227
228#define NOTE_GNU_STACK ".note.GNU-stack"
229#define SHOW_PHDR(B) \
230 if (elf->elf_class == ELFCLASS ## B) { \
231 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
232 Elf ## B ## _Off offset; \
233 uint32_t flags, check_flags; \
234 if (elf->phdr != NULL) { \
235 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
236 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
237 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
238 if (multi_stack++) \
239 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
240 if (file_matches_list(elf->filename, qa_execstack)) \
241 continue; \
242 found = found_phdr; \
243 offset = 0; \
244 check_flags = PF_X; \
245 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
246 if (multi_relro++) \
247 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
248 found = found_relro; \
249 offset = 4; \
250 check_flags = PF_X; \
251 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
252 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
253 if (multi_load++ > 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; \
257 found = found_load; \
258 offset = 8; \
259 check_flags = PF_W|PF_X; \
260 } else \
261 continue; \
262 flags = EGET(phdr[i].p_flags); \
263 if (be_quiet && ((flags & check_flags) != check_flags)) \
264 continue; \
265 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
266 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
267 ret[3] = ret[7] = '!'; \
268 flags = EGET(phdr[i].p_flags); \
269 } \
270 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
271 *found = 1; \
272 ++shown; \
273 } \
274 } else if (elf->shdr != NULL) { \
275 /* no program headers which means this is prob an object file */ \
276 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
277 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
278 char *str; \
279 if ((void*)strtbl > elf->data_end) \
280 goto skip_this_shdr##B; \
281 check_flags = SHF_WRITE|SHF_EXECINSTR; \
282 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
283 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
284 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
285 str = elf->data + offset; \
286 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
287 if (!strcmp(str, NOTE_GNU_STACK)) { \
288 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
289 flags = EGET(shdr[i].sh_flags); \
290 if (be_quiet && ((flags & check_flags) != check_flags)) \
291 continue; \
292 ++*found_phdr; \
293 shown = 1; \
294 if (flags & SHF_WRITE) ret[0] = 'W'; \
295 if (flags & SHF_ALLOC) ret[1] = 'A'; \
296 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
297 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
298 break; \
299 } \
300 } \
301 skip_this_shdr##B: \
302 if (!multi_stack) { \
303 if (file_matches_list(elf->filename, qa_execstack)) \
304 return NULL; \
305 *found_phdr = 1; \
306 shown = 1; \
307 memcpy(ret, "!WX", 3); \
308 } \
309 } \
310 }
311 SHOW_PHDR(32)
312 SHOW_PHDR(64)
313
314 if (be_wewy_wewy_quiet || (be_quiet && !shown))
315 return NULL;
316 else
317 return ret;
318}
319
320/*
321 * See if this ELF contains a DT_TEXTREL tag in any of its
322 * PT_DYNAMIC sections.
323 */
128static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 324static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
129{ 325{
130 static char *ret = "TEXTREL"; 326 static const char *ret = "TEXTREL";
131 int i; 327 unsigned long i;
132 328
133 if (!show_textrel) return NULL; 329 if (!show_textrel && !show_textrels) return NULL;
134 330
331 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
332
333 if (elf->phdr) {
135#define SHOW_TEXTREL(B) \ 334#define SHOW_TEXTREL(B) \
136 if (elf->elf_class == ELFCLASS ## B) { \ 335 if (elf->elf_class == ELFCLASS ## B) { \
137 Elf ## B ## _Dyn *dyn; \ 336 Elf ## B ## _Dyn *dyn; \
138 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 337 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
139 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 338 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
339 Elf ## B ## _Off offset; \
140 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 340 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
141 if (phdr[i].p_type != PT_DYNAMIC) continue; \ 341 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
342 offset = EGET(phdr[i].p_offset); \
343 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
142 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 344 dyn = DYN ## B (elf->vdata + offset); \
143 while (EGET(dyn->d_tag) != DT_NULL) { \ 345 while (EGET(dyn->d_tag) != DT_NULL) { \
144 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)*/ \
145 *found_textrel = 1; \ 347 *found_textrel = 1; \
146 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 348 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
147 return ret; \ 349 return (be_wewy_wewy_quiet ? NULL : ret); \
148 } \ 350 } \
149 ++dyn; \ 351 ++dyn; \
150 } \ 352 } \
151 } } 353 } }
152 SHOW_TEXTREL(32) 354 SHOW_TEXTREL(32)
153 SHOW_TEXTREL(64) 355 SHOW_TEXTREL(64)
154 if (be_quiet) 356 }
357
358 if (be_quiet || be_wewy_wewy_quiet)
155 return NULL; 359 return NULL;
156 else 360 else
157 return " - "; 361 return " - ";
158} 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 */
369static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
370{
371 unsigned long s, r, rmax;
372 void *symtab_void, *strtab_void, *text_void;
373
374 if (!show_textrels) return NULL;
375
376 /* don't search for TEXTREL's if the ELF doesn't have any */
377 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
378 if (!*found_textrel) return NULL;
379
380 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
381 text_void = elf_findsecbyname(elf, ".text");
382
383 if (symtab_void && strtab_void && text_void && elf->shdr) {
384#define SHOW_TEXTRELS(B) \
385 if (elf->elf_class == ELFCLASS ## B) { \
386 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
387 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
388 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
389 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
390 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
391 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
392 uint ## B ## _t memsz = EGET(text->sh_size); \
393 Elf ## B ## _Rel *rel; \
394 Elf ## B ## _Rela *rela; \
395 /* search the section headers for relocations */ \
396 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
397 uint32_t sh_type = EGET(shdr[s].sh_type); \
398 if (sh_type == SHT_REL) { \
399 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
400 rela = NULL; \
401 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
402 } else if (sh_type == SHT_RELA) { \
403 rel = NULL; \
404 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
405 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
406 } else \
407 continue; \
408 /* now see if any of the relocs are in the .text */ \
409 for (r = 0; r < rmax; ++r) { \
410 unsigned long sym_max; \
411 Elf ## B ## _Addr offset_tmp; \
412 Elf ## B ## _Sym *func; \
413 Elf ## B ## _Sym *sym; \
414 Elf ## B ## _Addr r_offset; \
415 uint ## B ## _t r_info; \
416 if (sh_type == SHT_REL) { \
417 r_offset = EGET(rel[r].r_offset); \
418 r_info = EGET(rel[r].r_info); \
419 } else { \
420 r_offset = EGET(rela[r].r_offset); \
421 r_info = EGET(rela[r].r_info); \
422 } \
423 /* make sure this relocation is inside of the .text */ \
424 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
425 if (be_verbose <= 2) continue; \
426 } else \
427 *found_textrels = 1; \
428 /* locate this relocation symbol name */ \
429 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
430 if ((void*)sym > elf->data_end) { \
431 warn("%s: corrupt ELF symbol", elf->filename); \
432 continue; \
433 } \
434 sym_max = ELF ## B ## _R_SYM(r_info); \
435 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
436 sym += sym_max; \
437 else \
438 sym = NULL; \
439 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
440 /* show the raw details about this reloc */ \
441 printf(" %s: ", elf->base_filename); \
442 if (sym && sym->st_name) \
443 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
444 else \
445 printf("(memory/data?)"); \
446 printf(" [0x%lX]", (unsigned long)r_offset); \
447 /* now try to find the closest symbol that this rel is probably in */ \
448 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
449 func = NULL; \
450 offset_tmp = 0; \
451 while (sym_max--) { \
452 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
453 func = sym; \
454 offset_tmp = EGET(sym->st_value); \
455 } \
456 ++sym; \
457 } \
458 printf(" in "); \
459 if (func && 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); \
463 else \
464 printf("%s", func_name); \
465 } else \
466 printf("(optimized out)"); \
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 } \
489 } \
490 } }
491 SHOW_TEXTRELS(32)
492 SHOW_TEXTRELS(64)
493 }
494 if (!*found_textrels)
495 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
496
497 return NULL;
498}
499
500static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
501{
502 struct stat st;
503 switch (*item) {
504 case '/': break;
505 case '.':
506 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
507 break;
508 case ':':
509 case '\0':
510 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
511 break;
512 case '$':
513 if (fstat(elf->fd, &st) != -1)
514 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
515 warnf("Security problem with %s='%s' in %s with mode set of %o",
516 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
517 break;
518 default:
519 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
520 break;
521 }
522}
159static 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)
160{ 524{
161 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */ 525 unsigned long i;
162 int i;
163 char *rpath, *runpath; 526 char *rpath, *runpath, **r;
164 void *strtbl_void; 527 void *strtbl_void;
165 528
166 if (!show_rpath) return; 529 if (!show_rpath) return;
167 530
168 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 531 strtbl_void = elf_findsecbyname(elf, ".dynstr");
169 rpath = runpath = NULL; 532 rpath = runpath = NULL;
170 533
171 if (strtbl_void) { 534 if (elf->phdr && strtbl_void) {
172#define SHOW_RPATH(B) \ 535#define SHOW_RPATH(B) \
173 if (elf->elf_class == ELFCLASS ## B) { \ 536 if (elf->elf_class == ELFCLASS ## B) { \
174 Elf ## B ## _Dyn *dyn; \ 537 Elf ## B ## _Dyn *dyn; \
175 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 538 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
176 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 539 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
177 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 540 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
541 Elf ## B ## _Off offset; \
542 Elf ## B ## _Xword word; \
543 /* Scan all the program headers */ \
178 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 544 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
545 /* Just scan dynamic headers */ \
179 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 546 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
547 offset = EGET(phdr[i].p_offset); \
548 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
549 /* Just scan dynamic RPATH/RUNPATH headers */ \
180 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 550 dyn = DYN ## B (elf->vdata + offset); \
181 while (EGET(dyn->d_tag) != DT_NULL) { \ 551 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
182 if (EGET(dyn->d_tag) == DT_RPATH) { \ 552 if (word == DT_RPATH) { \
183 if (rpath) warn("ELF has multiple DT_RPATH's !?"); \ 553 r = &rpath; \
554 } else if (word == DT_RUNPATH) { \
555 r = &runpath; \
556 } else { \
557 ++dyn; \
558 continue; \
559 } \
560 /* Verify the memory is somewhat sane */ \
184 rpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 561 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
562 if (offset < (Elf ## B ## _Off)elf->len) { \
563 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
564 *r = elf->data + offset; \
565 /* cache the length in case we need to nuke this section later on */ \
566 if (fix_elf) \
567 offset = strlen(*r); \
568 /* If quiet, don't output paths in ld.so.conf */ \
569 if (be_quiet) { \
570 size_t len; \
571 char *start, *end; \
572 /* note that we only 'chop' off leading known paths. */ \
573 /* since *r is read-only memory, we can only move the ptr forward. */ \
574 start = *r; \
575 /* scan each path in : delimited list */ \
576 while (start) { \
577 rpath_security_checks(elf, start, get_elfdtype(word)); \
578 end = strchr(start, ':'); \
579 len = (end ? abs(end - start) : strlen(start)); \
580 if (use_ldcache) { \
581 size_t n; \
582 const char *ldpath; \
583 array_for_each(ldpaths, n, ldpath) \
584 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
585 *r = end; \
586 /* corner case ... if RPATH reads "/usr/lib:", we want \
587 * to show ':' rather than '' */ \
588 if (end && end[1] != '\0') \
589 (*r)++; \
590 break; \
591 } \
592 } \
593 if (!*r || !end) \
594 break; \
595 else \
596 start = start + len + 1; \
597 } \
598 } \
599 if (*r) { \
600 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
601 /* just nuke it */ \
602 nuke_it##B: \
603 memset(*r, 0x00, offset); \
604 *r = NULL; \
605 ESET(dyn->d_tag, DT_DEBUG); \
606 ESET(dyn->d_un.d_ptr, 0); \
607 } else if (fix_elf) { \
608 /* try to clean "bad" paths */ \
609 size_t len, tmpdir_len; \
610 char *start, *end; \
611 const char *tmpdir; \
612 start = *r; \
613 tmpdir = (getenv("TMPDIR") ? : "."); \
614 tmpdir_len = strlen(tmpdir); \
615 while (1) { \
616 end = strchr(start, ':'); \
617 if (start == end) { \
618 eat_this_path##B: \
619 len = strlen(end); \
620 memmove(start, end+1, len); \
621 start[len-1] = '\0'; \
622 end = start - 1; \
623 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
624 if (!end) { \
625 if (start == *r) \
626 goto nuke_it##B; \
627 *--start = '\0'; \
628 } else \
629 goto eat_this_path##B; \
630 } \
631 if (!end) \
632 break; \
633 start = end + 1; \
634 } \
635 if (**r == '\0') \
636 goto nuke_it##B; \
637 } \
638 if (*r) \
185 *found_rpath = 1; \ 639 *found_rpath = 1; \
186 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \ 640 } \
187 if (runpath) warn("ELF has multiple DT_RUNPATH's !?"); \
188 runpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
189 *found_rpath = 1; \
190 } \ 641 } \
191 ++dyn; \ 642 ++dyn; \
192 } \ 643 } \
193 } } 644 } }
194 SHOW_RPATH(32) 645 SHOW_RPATH(32)
195 SHOW_RPATH(64) 646 SHOW_RPATH(64)
196 } 647 }
648
649 if (be_wewy_wewy_quiet) return;
197 650
198 if (rpath && runpath) { 651 if (rpath && runpath) {
199 if (!strcmp(rpath, runpath)) { 652 if (!strcmp(rpath, runpath)) {
200 xstrcat(ret, runpath, ret_len); 653 xstrcat(ret, runpath, ret_len);
201 } else { 654 } else {
209 } else if (rpath || runpath) 662 } else if (rpath || runpath)
210 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 663 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
211 else if (!be_quiet) 664 else if (!be_quiet)
212 xstrcat(ret, " - ", ret_len); 665 xstrcat(ret, " - ", ret_len);
213} 666}
667
668#define LDSO_CACHE_MAGIC "ld.so-"
669#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
670#define LDSO_CACHE_VER "1.7.0"
671#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
672#define FLAG_ANY -1
673#define FLAG_TYPE_MASK 0x00ff
674#define FLAG_LIBC4 0x0000
675#define FLAG_ELF 0x0001
676#define FLAG_ELF_LIBC5 0x0002
677#define FLAG_ELF_LIBC6 0x0003
678#define FLAG_REQUIRED_MASK 0xff00
679#define FLAG_SPARC_LIB64 0x0100
680#define FLAG_IA64_LIB64 0x0200
681#define FLAG_X8664_LIB64 0x0300
682#define FLAG_S390_LIB64 0x0400
683#define FLAG_POWERPC_LIB64 0x0500
684#define FLAG_MIPS64_LIBN32 0x0600
685#define FLAG_MIPS64_LIBN64 0x0700
686
687#if defined(__GLIBC__) || defined(__UCLIBC__)
688
689static char *lookup_cache_lib(elfobj *elf, char *fname)
690{
691 int fd;
692 char *strs;
693 static char buf[__PAX_UTILS_PATH_MAX] = "";
694 const char cachefile[] = "/etc/ld.so.cache";
695 struct stat st;
696
697 typedef struct {
698 char magic[LDSO_CACHE_MAGIC_LEN];
699 char version[LDSO_CACHE_VER_LEN];
700 int nlibs;
701 } header_t;
702 header_t *header;
703
704 typedef struct {
705 int flags;
706 int sooffset;
707 int liboffset;
708 } libentry_t;
709 libentry_t *libent;
710
711 if (fname == NULL)
712 return NULL;
713
714 if (ldcache == NULL) {
715 if (stat(cachefile, &st))
716 return NULL;
717
718 fd = open(cachefile, O_RDONLY);
719 if (fd == -1)
720 return NULL;
721
722 /* cache these values so we only map/unmap the cache file once */
723 ldcache_size = st.st_size;
724 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
725 close(fd);
726
727 if (ldcache == MAP_FAILED) {
728 ldcache = NULL;
729 return NULL;
730 }
731
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;
737 return NULL;
738 }
739 } else
740 header = ldcache;
741
742 libent = ldcache + sizeof(header_t);
743 strs = (char *) &libent[header->nlibs];
744
745 for (fd = 0; fd < header->nlibs; ++fd) {
746 /* This should be more fine grained, but for now we assume that
747 * diff arches will not be cached together, and we ignore the
748 * the different multilib mips cases.
749 */
750 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
751 continue;
752 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
753 continue;
754
755 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
756 continue;
757
758 /* Return first hit because that is how the ldso rolls */
759 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
760 break;
761 }
762
763 return buf;
764}
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
801
214static void scanelf_file_needed(elfobj *elf, char *found_needed, 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)
215{ 803{
216 int i; 804 unsigned long i;
217 char *needed; 805 char *needed;
218 void *strtbl_void; 806 void *strtbl_void;
807 char *p;
219 808
220 if (!show_needed) return; 809 /*
810 * -n -> op==0 -> print all
811 * -N -> op==1 -> print requested
812 */
813 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
814 return NULL;
221 815
222 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 816 strtbl_void = elf_findsecbyname(elf, ".dynstr");
223 817
224 if (strtbl_void) { 818 if (elf->phdr && strtbl_void) {
225#define SHOW_NEEDED(B) \ 819#define SHOW_NEEDED(B) \
226 if (elf->elf_class == ELFCLASS ## B) { \ 820 if (elf->elf_class == ELFCLASS ## B) { \
227 Elf ## B ## _Dyn *dyn; \ 821 Elf ## B ## _Dyn *dyn; \
228 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 822 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
229 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 823 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
230 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 824 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
825 Elf ## B ## _Off offset; \
826 size_t matched = 0; \
827 /* Walk all the program headers to find the PT_DYNAMIC */ \
231 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 828 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
232 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; \
831 offset = EGET(phdr[i].p_offset); \
832 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
833 continue; \
834 /* Walk all the dynamic tags to find NEEDED entries */ \
233 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 835 dyn = DYN ## B (elf->vdata + offset); \
234 while (EGET(dyn->d_tag) != DT_NULL) { \ 836 while (EGET(dyn->d_tag) != DT_NULL) { \
235 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 837 if (EGET(dyn->d_tag) == DT_NEEDED) { \
236 needed = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 838 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
839 if (offset >= (Elf ## B ## _Off)elf->len) { \
840 ++dyn; \
841 continue; \
842 } \
843 needed = elf->data + offset; \
844 if (op == 0) { \
845 /* -n -> print all entries */ \
846 if (!be_wewy_wewy_quiet) { \
237 if (*found_needed) xchrcat(ret, ',', ret_len); \ 847 if (*found_needed) xchrcat(ret, ',', ret_len); \
848 if (use_ldcache) \
849 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
850 needed = p; \
238 xstrcat(ret, needed, ret_len); \ 851 xstrcat(ret, needed, ret_len); \
852 } \
239 *found_needed = 1; \ 853 *found_needed = 1; \
854 } else { \
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)) { \
864 *found_lib = 1; \
865 return (be_wewy_wewy_quiet ? NULL : find_lib); \
866 } \
867 } \
240 } \ 868 } \
241 ++dyn; \ 869 ++dyn; \
242 } \ 870 } \
243 } } 871 } }
244 SHOW_NEEDED(32) 872 SHOW_NEEDED(32)
245 SHOW_NEEDED(64) 873 SHOW_NEEDED(64)
874 if (op == 0 && !*found_needed && be_verbose)
875 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
246 } 876 }
877
878 return NULL;
247} 879}
248static char *scanelf_file_interp(elfobj *elf, char *found_interp) 880static char *scanelf_file_interp(elfobj *elf, char *found_interp)
249{ 881{
250 void *strtbl_void; 882 void *strtbl_void;
251 883
256 if (strtbl_void) { 888 if (strtbl_void) {
257#define SHOW_INTERP(B) \ 889#define SHOW_INTERP(B) \
258 if (elf->elf_class == ELFCLASS ## B) { \ 890 if (elf->elf_class == ELFCLASS ## B) { \
259 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 891 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
260 *found_interp = 1; \ 892 *found_interp = 1; \
261 return elf->data + EGET(strtbl->sh_offset); \ 893 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
262 } 894 }
263 SHOW_INTERP(32) 895 SHOW_INTERP(32)
264 SHOW_INTERP(64) 896 SHOW_INTERP(64)
265 } 897 }
266 return NULL; 898 return NULL;
267} 899}
900static char *scanelf_file_bind(elfobj *elf, char *found_bind)
901{
902 unsigned long i;
903 struct stat s;
904 char dynamic = 0;
905
906 if (!show_bind) return NULL;
907 if (!elf->phdr) return NULL;
908
909#define SHOW_BIND(B) \
910 if (elf->elf_class == ELFCLASS ## B) { \
911 Elf ## B ## _Dyn *dyn; \
912 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
913 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
914 Elf ## B ## _Off offset; \
915 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
916 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
917 dynamic = 1; \
918 offset = EGET(phdr[i].p_offset); \
919 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
920 dyn = DYN ## B (elf->vdata + offset); \
921 while (EGET(dyn->d_tag) != DT_NULL) { \
922 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
923 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
924 { \
925 if (be_quiet) return NULL; \
926 *found_bind = 1; \
927 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
928 } \
929 ++dyn; \
930 } \
931 } \
932 }
933 SHOW_BIND(32)
934 SHOW_BIND(64)
935
936 if (be_wewy_wewy_quiet) return NULL;
937
938 /* don't output anything if quiet mode and the ELF is static or not setuid */
939 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
940 return NULL;
941 } else {
942 *found_bind = 1;
943 return (char *)(dynamic ? "LAZY" : "STATIC");
944 }
945}
268static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename) 946static char *scanelf_file_soname(elfobj *elf, char *found_soname)
269{ 947{
270 int i; 948 unsigned long i;
949 char *soname;
950 void *strtbl_void;
951
952 if (!show_soname) return NULL;
953
954 strtbl_void = elf_findsecbyname(elf, ".dynstr");
955
956 if (elf->phdr && strtbl_void) {
957#define SHOW_SONAME(B) \
958 if (elf->elf_class == ELFCLASS ## B) { \
959 Elf ## B ## _Dyn *dyn; \
960 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
961 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
962 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
963 Elf ## B ## _Off offset; \
964 /* only look for soname in shared objects */ \
965 if (EGET(ehdr->e_type) != ET_DYN) \
966 return NULL; \
967 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
968 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
969 offset = EGET(phdr[i].p_offset); \
970 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
971 dyn = DYN ## B (elf->vdata + offset); \
972 while (EGET(dyn->d_tag) != DT_NULL) { \
973 if (EGET(dyn->d_tag) == DT_SONAME) { \
974 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
975 if (offset >= (Elf ## B ## _Off)elf->len) { \
976 ++dyn; \
977 continue; \
978 } \
979 soname = elf->data + offset; \
980 *found_soname = 1; \
981 return (be_wewy_wewy_quiet ? NULL : soname); \
982 } \
983 ++dyn; \
984 } \
985 } }
986 SHOW_SONAME(32)
987 SHOW_SONAME(64)
988 }
989
990 return NULL;
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
1160static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1161{
1162 unsigned long i;
1163 char *ret;
271 void *symtab_void, *strtab_void; 1164 void *symtab_void, *strtab_void;
272 1165
273 if (!find_sym) return NULL; 1166 if (!find_sym) return NULL;
1167 ret = NULL;
274 1168
275 symtab_void = elf_findsecbyname(elf, ".symtab"); 1169 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
276 strtab_void = elf_findsecbyname(elf, ".strtab");
277 1170
278 if (symtab_void && strtab_void) { 1171 if (symtab_void && strtab_void) {
279#define FIND_SYM(B) \ 1172#define FIND_SYM(B) \
280 if (elf->elf_class == ELFCLASS ## B) { \ 1173 if (elf->elf_class == ELFCLASS ## B) { \
281 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1174 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
282 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1175 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
283 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)); \
284 int cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1177 unsigned long cnt = EGET(symtab->sh_entsize); \
285 char *symname; \ 1178 char *symname; \
1179 size_t ret_len = 0; \
1180 if (cnt) \
1181 cnt = EGET(symtab->sh_size) / cnt; \
286 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 } \
287 if (sym->st_name) { \ 1187 if (sym->st_name) { \
1188 /* make sure the symbol name is in acceptable memory range */ \
288 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1189 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
289 if (*find_sym == '*') { \ 1190 if ((void*)symname > elf->data_end) { \
290 printf("%s(%s) %5lX %15s %s\n", \ 1191 warnf("%s: corrupt ELF symbols", elf->filename); \
291 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1192 ++sym; \
292 (char *)basename(filename), \ 1193 continue; \
293 (long)sym->st_size, \ 1194 } \
294 (char *)get_elfstttype(sym->st_info), \ 1195 scanelf_match_symname(elf, found_sym, \
295 symname); \ 1196 &ret, &ret_len, symname, \
296 *found_sym = 1; \ 1197 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
297 } else if ((strcmp(find_sym, symname) == 0) || \ 1198 ELF##B##_ST_BIND(EGET(sym->st_info)), \
298 (strcmp(symname, versioned_symname) == 0)) \ 1199 EGET(sym->st_shndx), \
299 (*found_sym)++; \ 1200 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1201 EGET(sym->st_size)); \
300 } \ 1202 } \
301 ++sym; \ 1203 ++sym; \
302 } } 1204 } }
303 FIND_SYM(32) 1205 FIND_SYM(32)
304 FIND_SYM(64) 1206 FIND_SYM(64)
305 } 1207 }
1208
1209break_out:
1210 if (be_wewy_wewy_quiet) return NULL;
1211
306 if (*find_sym != '*' && *found_sym) 1212 if (*find_sym != '*' && *found_sym)
307 return find_sym; 1213 return ret;
308 if (be_quiet) 1214 if (be_quiet)
309 return NULL; 1215 return NULL;
310 else 1216 else
311 return " - "; 1217 return " - ";
312} 1218}
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}
1257
313/* scan an elf file and show all the fun stuff */ 1258/* scan an elf file and show all the fun stuff */
314#define prints(str) fputs(str, stdout) 1259#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
315static void scanelf_file(const char *filename) 1260static int scanelf_elfobj(elfobj *elf)
316{ 1261{
317 int i; 1262 unsigned long i;
318 char found_pax, found_stack, found_relro, found_textrel, 1263 char found_pax, found_phdr, found_relro, found_load, found_textrel,
319 found_rpath, found_needed, found_interp, found_sym, 1264 found_rpath, found_needed, found_interp, found_bind, found_soname,
320 found_file; 1265 found_sym, found_lib, found_file, found_textrels, found_section;
321 elfobj *elf;
322 struct stat st;
323 static char *out_buffer = NULL; 1266 static char *out_buffer = NULL;
324 static size_t out_len; 1267 static size_t out_len;
325 1268
326 /* make sure 'filename' exists */
327 if (lstat(filename, &st) == -1) {
328 if (be_verbose > 2) printf("%s: does not exist\n", filename);
329 return;
330 }
331 /* always handle regular files and handle symlinked files if no -y */
332 if (!(S_ISREG(st.st_mode) || (S_ISLNK(st.st_mode) && scan_symlink))) {
333 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
334 return;
335 }
336
337 found_pax = found_stack = found_relro = found_textrel = \ 1269 found_pax = found_phdr = found_relro = found_load = found_textrel = \
338 found_rpath = found_needed = found_interp = found_sym = \ 1270 found_rpath = found_needed = found_interp = found_bind = found_soname = \
339 found_file = 0; 1271 found_sym = found_lib = found_file = found_textrels = found_section = 0;
340 1272
341 /* verify this is real ELF */
342 if ((elf = readelf(filename)) == NULL) {
343 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
344 return;
345 }
346
347 if (be_verbose > 1) 1273 if (be_verbose > 2)
348 printf("%s: scanning file {%s,%s}\n", filename, 1274 printf("%s: scanning file {%s,%s}\n", elf->filename,
349 get_elfeitype(elf, EI_CLASS, elf->elf_class), 1275 get_elfeitype(EI_CLASS, elf->elf_class),
350 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA])); 1276 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
351 else if (be_verbose) 1277 else if (be_verbose > 1)
352 printf("%s: scanning file\n", filename); 1278 printf("%s: scanning file\n", elf->filename);
353 1279
354 /* init output buffer */ 1280 /* init output buffer */
355 if (!out_buffer) { 1281 if (!out_buffer) {
356 out_len = sizeof(char) * 80; 1282 out_len = sizeof(char) * 80;
357 out_buffer = (char*)xmalloc(out_len); 1283 out_buffer = xmalloc(out_len);
358 } 1284 }
359 *out_buffer = '\0'; 1285 *out_buffer = '\0';
360 1286
361 /* show the header */ 1287 /* show the header */
362 if (!be_quiet && show_banner) { 1288 if (!be_quiet && show_banner) {
363 for (i=0; out_format[i]; ++i) { 1289 for (i = 0; out_format[i]; ++i) {
364 if (out_format[i] != '%') continue; 1290 if (!IS_MODIFIER(out_format[i])) continue;
365 1291
366 switch (out_format[++i]) { 1292 switch (out_format[++i]) {
1293 case '+': break;
367 case '%': break; 1294 case '%': break;
1295 case '#': break;
1296 case 'F':
1297 case 'p':
368 case 'F': prints("FILE "); break; 1298 case 'f': prints("FILE "); found_file = 1; break;
369 case 'o': prints(" TYPE "); break; 1299 case 'o': prints(" TYPE "); break;
370 case 'x': prints(" PAX "); break; 1300 case 'x': prints(" PAX "); break;
371 case 'e': prints("STK/REL "); break; 1301 case 'e': prints("STK/REL/PTL "); break;
372 case 't': prints("TEXTREL "); break; 1302 case 't': prints("TEXTREL "); break;
373 case 'r': prints("RPATH "); break; 1303 case 'r': prints("RPATH "); break;
1304 case 'M': prints("CLASS "); break;
374 case 'n': prints("NEEDED "); break; 1305 case 'n': prints("NEEDED "); break;
375 case 'i': prints("INTERP "); break; 1306 case 'i': prints("INTERP "); break;
1307 case 'b': prints("BIND "); break;
1308 case 'Z': prints("SIZE "); break;
1309 case 'S': prints("SONAME "); break;
376 case 's': prints("SYM "); break; 1310 case 's': prints("SYM "); break;
1311 case 'N': prints("LIB "); 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;
1319 default: warnf("'%c' has no title ?", out_format[i]);
377 } 1320 }
378 } 1321 }
1322 if (!found_file) prints("FILE ");
379 prints("\n"); 1323 prints("\n");
1324 found_file = 0;
380 show_banner = 0; 1325 show_banner = 0;
381 } 1326 }
382 1327
383 /* dump all the good stuff */ 1328 /* dump all the good stuff */
384 for (i=0; out_format[i]; ++i) { 1329 for (i = 0; out_format[i]; ++i) {
385 const char *out; 1330 const char *out;
386 1331 const char *tmp;
387 /* make sure we trim leading spaces in quiet mode */ 1332 static char ubuf[sizeof(unsigned long)*2];
388 if (be_quiet && *out_buffer == ' ' && !out_buffer[1]) 1333 if (!IS_MODIFIER(out_format[i])) {
389 *out_buffer = '\0';
390
391 if (out_format[i] != '%') {
392 xchrcat(&out_buffer, out_format[i], &out_len); 1334 xchrcat(&out_buffer, out_format[i], &out_len);
393 continue; 1335 continue;
394 } 1336 }
395 1337
396 out = NULL; 1338 out = NULL;
1339 be_wewy_wewy_quiet = (out_format[i] == '#');
1340 be_semi_verbose = (out_format[i] == '+');
397 switch (out_format[++i]) { 1341 switch (out_format[++i]) {
1342 case '+':
1343 case '%':
1344 case '#':
398 case '%': xchrcat(&out_buffer, '%', &out_len); break; 1345 xchrcat(&out_buffer, out_format[i], &out_len); break;
399 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break; 1346 case 'F':
1347 found_file = 1;
1348 if (be_wewy_wewy_quiet) break;
1349 xstrcat(&out_buffer, elf->filename, &out_len);
1350 break;
1351 case 'p':
1352 found_file = 1;
1353 if (be_wewy_wewy_quiet) break;
1354 tmp = elf->filename;
1355 if (search_path) {
1356 ssize_t len_search = strlen(search_path);
1357 ssize_t len_file = strlen(elf->filename);
1358 if (!strncmp(elf->filename, search_path, len_search) && \
1359 len_file > len_search)
1360 tmp += len_search;
1361 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1362 }
1363 xstrcat(&out_buffer, tmp, &out_len);
1364 break;
1365 case 'f':
1366 found_file = 1;
1367 if (be_wewy_wewy_quiet) break;
1368 tmp = strrchr(elf->filename, '/');
1369 tmp = (tmp == NULL ? elf->filename : tmp+1);
1370 xstrcat(&out_buffer, tmp, &out_len);
1371 break;
400 case 'o': out = get_elfetype(elf); break; 1372 case 'o': out = get_elfetype(elf); break;
401 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1373 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
402 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break; 1374 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
403 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1375 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1376 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
404 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;
1381 case 'n':
405 case 'n': scanelf_file_needed(elf, &found_needed, &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;
406 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1383 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1384 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1385 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
407 case 's': out = scanelf_file_sym(elf, &found_sym, filename); 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;;
1392 default: warnf("'%c' has no scan code?", out_format[i]);
408 } 1393 }
1394 if (out)
409 if (out) xstrcat(&out_buffer, out, &out_len); 1395 xstrcat(&out_buffer, out, &out_len);
410 } 1396 }
411 1397
412 if (!found_file) { 1398#define FOUND_SOMETHING() \
413 if (!be_quiet || found_pax || found_stack || found_textrel || \ 1399 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
414 found_rpath || found_needed || found_interp || found_sym) 1400 found_rpath || found_needed || found_interp || found_bind || \
1401 found_soname || found_sym || found_lib || found_textrels || found_section )
1402
1403 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1404 xchrcat(&out_buffer, ' ', &out_len);
415 xstrcat(&out_buffer, filename, &out_len); 1405 xstrcat(&out_buffer, elf->filename, &out_len);
416 } 1406 }
417 if (!(be_quiet && xemptybuffer(out_buffer))) 1407 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
418 puts(out_buffer); 1408 puts(out_buffer);
1409 fflush(stdout);
1410 }
419 1411
1412 return 0;
1413}
1414
1415/* scan a single elf */
1416static int scanelf_elf(const char *filename, int fd, size_t len)
1417{
1418 int ret = 1;
1419 elfobj *elf;
1420
1421 /* verify this is real ELF */
1422 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1423 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1424 return ret;
1425 }
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 }
1437 if (match_etypes) {
1438 char sbuf[126];
1439 strncpy(sbuf, match_etypes, sizeof(sbuf));
1440 if (strchr(match_etypes, ',') != NULL) {
1441 char *p;
1442 while ((p = strrchr(sbuf, ',')) != NULL) {
1443 *p = 0;
1444 if (etype_lookup(p+1) == get_etype(elf))
1445 goto label_ret;
1446 }
1447 }
1448 if (etype_lookup(sbuf) != get_etype(elf))
1449 goto label_done;
1450 }
1451
1452label_ret:
1453 ret = scanelf_elfobj(elf);
1454
1455label_done:
420 unreadelf(elf); 1456 unreadelf(elf);
1457 return ret;
1458}
1459
1460/* scan an archive of elfs */
1461static int scanelf_archive(const char *filename, int fd, size_t len)
1462{
1463 archive_handle *ar;
1464 archive_member *m;
1465 char *ar_buffer;
1466 elfobj *elf;
1467
1468 ar = ar_open_fd(filename, fd);
1469 if (ar == NULL)
1470 return 1;
1471
1472 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
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");
1477 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1478 if (elf) {
1479 scanelf_elfobj(elf);
1480 unreadelf(elf);
1481 }
1482 }
1483 munmap(ar_buffer, len);
1484
1485 return 0;
1486}
1487/* scan a file which may be an elf or an archive or some other magical beast */
1488static int scanelf_file(const char *filename, const struct stat *st_cache)
1489{
1490 const struct stat *st = st_cache;
1491 struct stat symlink_st;
1492 int fd;
1493
1494 /* always handle regular files and handle symlinked files if no -y */
1495 if (S_ISLNK(st->st_mode)) {
1496 if (!scan_symlink) return 1;
1497 stat(filename, &symlink_st);
1498 st = &symlink_st;
1499 }
1500
1501 if (!S_ISREG(st->st_mode)) {
1502 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1503 return 1;
1504 }
1505
1506 if (match_perms) {
1507 if ((st->st_mode | match_perms) != st->st_mode)
1508 return 1;
1509 }
1510 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1511 return 1;
1512
1513 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1514 /* if it isn't an ELF, maybe it's an .a archive */
1515 scanelf_archive(filename, fd, st->st_size);
1516
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;
421} 1529}
422 1530
423/* 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 */
424static void scanelf_dir(const char *path) 1532static int scanelf_dir(const char *path)
425{ 1533{
426 register DIR *dir; 1534 register DIR *dir;
427 register struct dirent *dentry; 1535 register struct dirent *dentry;
428 struct stat st_top, st; 1536 struct stat st_top, st;
429 char buf[_POSIX_PATH_MAX]; 1537 char buf[__PAX_UTILS_PATH_MAX];
1538 char _path[__PAX_UTILS_PATH_MAX];
430 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);
431 1543
432 /* make sure path exists */ 1544 /* make sure path exists */
433 if (lstat(path, &st_top) == -1) { 1545 if (lstat(path, &st_top) == -1) {
434 if (be_verbose > 2) printf("%s: does not exist\n", path); 1546 if (be_verbose > 2) printf("%s: does not exist\n", path);
435 return; 1547 return 1;
436 } 1548 }
437 1549
438 /* 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 */
439 if (!S_ISDIR(st_top.st_mode)) { 1551 if (!S_ISDIR(st_top.st_mode)) {
440 scanelf_file(path); 1552 return scanelf_file(path, &st_top);
441 return;
442 } 1553 }
443 1554
444 /* now scan the dir looking for fun stuff */ 1555 /* now scan the dir looking for fun stuff */
445 if ((dir = opendir(path)) == NULL) { 1556 if ((dir = opendir(path)) == NULL) {
446 warnf("could not opendir %s: %s", path, strerror(errno)); 1557 warnf("could not opendir %s: %s", path, strerror(errno));
447 return; 1558 return 1;
448 } 1559 }
449 if (be_verbose) printf("%s: scanning dir\n", path); 1560 if (be_verbose > 1) printf("%s: scanning dir\n", path);
450 1561
451 pathlen = strlen(path); 1562 pathlen = strlen(path);
452 while ((dentry = readdir(dir))) { 1563 while ((dentry = readdir(dir))) {
453 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1564 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
454 continue; 1565 continue;
455 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1566 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
456 if (len >= sizeof(buf)) { 1567 if (len >= sizeof(buf)) {
457 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf)); 1568 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1569 (unsigned long)len, (unsigned long)sizeof(buf));
458 continue; 1570 continue;
459 } 1571 }
460 sprintf(buf, "%s/%s", path, dentry->d_name); 1572 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
461 if (lstat(buf, &st) != -1) { 1573 if (lstat(buf, &st) != -1) {
462 if (S_ISREG(st.st_mode)) 1574 if (S_ISREG(st.st_mode))
463 scanelf_file(buf); 1575 ret = scanelf_file(buf, &st);
464 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1576 else if (dir_recurse && S_ISDIR(st.st_mode)) {
465 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1577 if (dir_crossmount || (st_top.st_dev == st.st_dev))
466 scanelf_dir(buf); 1578 ret = scanelf_dir(buf);
467 } 1579 }
468 } 1580 }
469 } 1581 }
470 closedir(dir); 1582 closedir(dir);
1583 return ret;
471} 1584}
1585
1586static int scanelf_from_file(const char *filename)
1587{
1588 FILE *fp = NULL;
1589 char *p;
1590 char path[__PAX_UTILS_PATH_MAX];
1591 int ret = 0;
1592
1593 if (strcmp(filename, "-") == 0)
1594 fp = stdin;
1595 else if ((fp = fopen(filename, "r")) == NULL)
1596 return 1;
1597
1598 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1599 if ((p = strchr(path, '\n')) != NULL)
1600 *p = 0;
1601 search_path = path;
1602 ret = scanelf_dir(path);
1603 }
1604 if (fp != stdin)
1605 fclose(fp);
1606 return ret;
1607}
1608
1609#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1610
1611static int load_ld_cache_config(int i, const char *fname)
1612{
1613 FILE *fp = NULL;
1614 char *p;
1615 char path[__PAX_UTILS_PATH_MAX];
1616 char _fname[__PAX_UTILS_PATH_MAX];
1617
1618 fname = maybe_add_root(fname, _fname);
1619
1620 if ((fp = fopen(fname, "r")) == NULL)
1621 return i;
1622
1623 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1624 if ((p = strrchr(path, '\r')) != NULL)
1625 *p = 0;
1626 if ((p = strchr(path, '\n')) != NULL)
1627 *p = 0;
1628
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];
1634
1635 memset(gpath, 0, sizeof(gpath));
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 }
1654 }
1655
1656 if (*path != '/')
1657 continue;
1658
1659 xarraypush(ldpaths, path, strlen(path));
1660 }
1661
1662 fclose(fp);
1663 return i;
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
472 1715
473/* scan /etc/ld.so.conf for paths */ 1716/* scan /etc/ld.so.conf for paths */
474static void scanelf_ldpath() 1717static void scanelf_ldpath(void)
475{ 1718{
476 char scan_l, scan_ul, scan_ull; 1719 char scan_l, scan_ul, scan_ull;
477 char *path, *p; 1720 size_t n;
478 FILE *fp; 1721 const char *ldpath;
1722 int i = 0;
479 1723
480 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1724 if (array_cnt(ldpaths) == 0)
481 err("Unable to open ld.so.conf: %s", strerror(errno)); 1725 err("Unable to load any paths from ld.so.conf");
482 1726
483 scan_l = scan_ul = scan_ull = 0; 1727 scan_l = scan_ul = scan_ull = 0;
484 1728
485 path = (char*)xmalloc(_POSIX_PATH_MAX); 1729 array_for_each(ldpaths, n, ldpath) {
486 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL)
487 if (*path == '/') {
488 if ((p = strrchr(path, '\r')) != NULL)
489 *p = 0;
490 if ((p = strrchr(path, '\n')) != NULL)
491 *p = 0;
492 if (!scan_l && !strcmp(path, "/lib")) scan_l = 1; 1730 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = 1;
493 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1; 1731 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = 1;
494 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1; 1732 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = 1;
495 scanelf_dir(path); 1733 scanelf_dir(ldpath);
1734 ++i;
496 } 1735 }
497 free(path);
498 fclose(fp);
499 1736
500 if (!scan_l) scanelf_dir("/lib"); 1737 if (!scan_l) scanelf_dir("/lib");
501 if (!scan_ul) scanelf_dir("/usr/lib"); 1738 if (!scan_ul) scanelf_dir("/usr/lib");
502 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1739 if (!scan_ull) scanelf_dir("/usr/local/lib");
503} 1740}
504 1741
505/* scan env PATH for paths */ 1742/* scan env PATH for paths */
506static void scanelf_envpath() 1743static void scanelf_envpath(void)
507{ 1744{
508 char *path, *p; 1745 char *path, *p;
509 1746
510 path = getenv("PATH"); 1747 path = getenv("PATH");
511 if (!path) 1748 if (!path)
518 } 1755 }
519 1756
520 free(path); 1757 free(path);
521} 1758}
522 1759
523 1760/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
524
525/* usage / invocation handling functions */
526#define PARSE_FLAGS "plRmyxetrnis:aqvF:o:BhV" 1761#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
527#define a_argument required_argument 1762#define a_argument required_argument
528static struct option const long_opts[] = { 1763static struct option const long_opts[] = {
529 {"path", no_argument, NULL, 'p'}, 1764 {"path", no_argument, NULL, 'p'},
530 {"ldpath", no_argument, NULL, 'l'}, 1765 {"ldpath", no_argument, NULL, 'l'},
1766 {"root", a_argument, NULL, 128},
531 {"recursive", no_argument, NULL, 'R'}, 1767 {"recursive", no_argument, NULL, 'R'},
532 {"mount", no_argument, NULL, 'm'}, 1768 {"mount", no_argument, NULL, 'm'},
533 {"symlink", no_argument, NULL, 'y'}, 1769 {"symlink", no_argument, NULL, 'y'},
1770 {"archives", no_argument, NULL, 'A'},
1771 {"ldcache", no_argument, NULL, 'L'},
1772 {"fix", no_argument, NULL, 'X'},
1773 {"setpax", a_argument, NULL, 'z'},
534 {"pax", no_argument, NULL, 'x'}, 1774 {"pax", no_argument, NULL, 'x'},
535 {"header", no_argument, NULL, 'e'}, 1775 {"header", no_argument, NULL, 'e'},
536 {"textrel", no_argument, NULL, 't'}, 1776 {"textrel", no_argument, NULL, 't'},
537 {"rpath", no_argument, NULL, 'r'}, 1777 {"rpath", no_argument, NULL, 'r'},
538 {"needed", no_argument, NULL, 'n'}, 1778 {"needed", no_argument, NULL, 'n'},
539 {"interp", no_argument, NULL, 'i'}, 1779 {"interp", no_argument, NULL, 'i'},
1780 {"bind", no_argument, NULL, 'b'},
1781 {"soname", no_argument, NULL, 'S'},
540 {"symbol", a_argument, NULL, 's'}, 1782 {"symbol", a_argument, NULL, 's'},
1783 {"section", a_argument, NULL, 'k'},
1784 {"lib", a_argument, NULL, 'N'},
1785 {"gmatch", no_argument, NULL, 'g'},
1786 {"textrels", no_argument, NULL, 'T'},
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'},
541 {"all", no_argument, NULL, 'a'}, 1794 {"all", no_argument, NULL, 'a'},
542 {"quiet", no_argument, NULL, 'q'}, 1795 {"quiet", no_argument, NULL, 'q'},
543 {"verbose", no_argument, NULL, 'v'}, 1796 {"verbose", no_argument, NULL, 'v'},
544 {"format", a_argument, NULL, 'F'}, 1797 {"format", a_argument, NULL, 'F'},
1798 {"from", a_argument, NULL, 'f'},
545 {"file", a_argument, NULL, 'o'}, 1799 {"file", a_argument, NULL, 'o'},
1800 {"nocolor", no_argument, NULL, 'C'},
546 {"nobanner", no_argument, NULL, 'B'}, 1801 {"nobanner", no_argument, NULL, 'B'},
547 {"help", no_argument, NULL, 'h'}, 1802 {"help", no_argument, NULL, 'h'},
548 {"version", no_argument, NULL, 'V'}, 1803 {"version", no_argument, NULL, 'V'},
549 {NULL, no_argument, NULL, 0x0} 1804 {NULL, no_argument, NULL, 0x0}
550}; 1805};
1806
551static char *opts_help[] = { 1807static const char * const opts_help[] = {
552 "Scan all directories in PATH environment", 1808 "Scan all directories in PATH environment",
553 "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)",
554 "Scan directories recursively", 1811 "Scan directories recursively",
555 "Don't recursively cross mount points", 1812 "Don't recursively cross mount points",
556 "Don't scan symlinks\n", 1813 "Don't scan symlinks",
1814 "Scan archives (.a files)",
1815 "Utilize ld.so.cache information (use with -r/-n)",
1816 "Try and 'fix' bad things (use with -r/-e)",
1817 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
557 "Print PaX markings", 1818 "Print PaX markings",
558 "Print GNU_STACK markings", 1819 "Print GNU_STACK/PT_LOAD markings",
559 "Print TEXTREL information", 1820 "Print TEXTREL information",
560 "Print RPATH information", 1821 "Print RPATH information",
561 "Print NEEDED information", 1822 "Print NEEDED information",
562 "Print INTERP information", 1823 "Print INTERP information",
1824 "Print BIND information",
1825 "Print SONAME information",
563 "Find a specified symbol", 1826 "Find a specified symbol",
564 "Print all scanned info (-x -e -t -r)\n", 1827 "Find a specified section",
1828 "Find a specified library",
1829 "Use regex matching rather than string compare (use with -s)",
1830 "Locate cause of TEXTREL",
1831 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1832 "Print only ELF files matching numeric bits",
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",
565 "Only output 'bad' things", 1839 "Only output 'bad' things",
566 "Be verbose (can be specified more than once)", 1840 "Be verbose (can be specified more than once)",
567 "Use specified format for output", 1841 "Use specified format for output",
1842 "Read input stream from a filename",
568 "Write output stream to a filename", 1843 "Write output stream to a filename",
1844 "Don't emit color in output",
569 "Don't display the header", 1845 "Don't display the header",
570 "Print this help and exit", 1846 "Print this help and exit",
571 "Print version and exit", 1847 "Print version and exit",
572 NULL 1848 NULL
573}; 1849};
574 1850
575/* display usage and exit */ 1851/* display usage and exit */
576static void usage(int status) 1852static void usage(int status)
577{ 1853{
578 int i; 1854 unsigned long i;
579 printf(" Scan ELF binaries for stuff\n\n" 1855 printf("* Scan ELF binaries for stuff\n\n"
580 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1856 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
581 printf("Options: -[%s]\n", PARSE_FLAGS); 1857 printf("Options: -[%s]\n", PARSE_FLAGS);
582 for (i = 0; long_opts[i].name; ++i) 1858 for (i = 0; long_opts[i].name; ++i)
583 if (long_opts[i].has_arg == no_argument) 1859 if (long_opts[i].has_arg == no_argument)
584 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",
585 long_opts[i].name, opts_help[i]); 1864 long_opts[i].name, opts_help[i]);
586 else 1865 else
587 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val, 1866 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
588 long_opts[i].name, opts_help[i]); 1867 long_opts[i].name, opts_help[i]);
1868
1869 puts("\nFor more information, see the scanelf(1) manpage");
589 exit(status); 1870 exit(status);
590} 1871}
591 1872
592/* 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 }
593static void parseargs(int argc, char *argv[]) 1882static int parseargs(int argc, char *argv[])
594{ 1883{
595 int flag; 1884 int i;
1885 const char *from_file = NULL;
1886 int ret = 0;
596 1887
597 opterr = 0; 1888 opterr = 0;
598 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1889 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
599 switch (flag) { 1890 switch (i) {
600 1891
601 case 'V': 1892 case 'V':
602 printf("%s compiled %s\n%s\n" 1893 printf("pax-utils-%s: %s compiled %s\n%s\n"
603 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 1894 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
604 __FILE__, __DATE__, rcsid, argv0); 1895 VERSION, __FILE__, __DATE__, rcsid, argv0);
605 exit(EXIT_SUCCESS); 1896 exit(EXIT_SUCCESS);
606 break; 1897 break;
607 case 'h': usage(EXIT_SUCCESS); break; 1898 case 'h': usage(EXIT_SUCCESS); break;
608 1899 case 'f':
1900 if (from_file) warn("You prob don't want to specify -f twice");
1901 from_file = optarg;
1902 break;
1903 case 'E':
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;
1918 break;
609 case 'o': { 1919 case 'o': {
610 FILE *fp = NULL;
611 fp = freopen(optarg, "w", stdout); 1920 if (freopen(optarg, "w", stdout) == NULL)
612 if (fp == NULL)
613 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1921 err("Could not open output stream '%s': %s", optarg, strerror(errno));
614 stdout = fp;
615 break; 1922 break;
616 } 1923 }
617 1924 case 'k':
1925 xarraypush(find_section_arr, optarg, strlen(optarg));
1926 break;
618 case 's': { 1927 case 's': {
619 size_t len; 1928 if (find_sym) warn("You prob don't want to specify -s twice");
620 find_sym = xstrdup(optarg); 1929 find_sym = optarg;
621 len = strlen(find_sym) + 1;
622 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
623 sprintf(versioned_symname, "%s@", find_sym);
624 break; 1930 break;
625 } 1931 }
626 1932 case 'N':
1933 xarraypush(find_lib_arr, optarg, strlen(optarg));
1934 break;
627 case 'F': { 1935 case 'F': {
1936 if (out_format) warn("You prob don't want to specify -F twice");
628 out_format = strdup(optarg); 1937 out_format = optarg;
629 break; 1938 break;
630 } 1939 }
1940 case 'z': {
1941 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1942 size_t x;
631 1943
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;
1985 case 'L': use_ldcache = 1; break;
632 case 'y': scan_symlink = 0; break; 1986 case 'y': scan_symlink = 0; break;
1987 case 'A': scan_archives = 1; break;
1988 case 'C': color_init(true); break;
633 case 'B': show_banner = 0; break; 1989 case 'B': show_banner = 0; break;
634 case 'l': scan_ldpath = 1; break; 1990 case 'l': scan_ldpath = 1; break;
635 case 'p': scan_envpath = 1; break; 1991 case 'p': scan_envpath = 1; break;
636 case 'R': dir_recurse = 1; break; 1992 case 'R': dir_recurse = 1; break;
637 case 'm': dir_crossmount = 0; break; 1993 case 'm': dir_crossmount = 0; break;
1994 case 'X': ++fix_elf; break;
638 case 'x': show_pax = 1; break; 1995 case 'x': show_pax = 1; break;
639 case 'e': show_stack = 1; break; 1996 case 'e': show_phdr = 1; break;
640 case 't': show_textrel = 1; break; 1997 case 't': show_textrel = 1; break;
641 case 'r': show_rpath = 1; break; 1998 case 'r': show_rpath = 1; break;
642 case 'n': show_needed = 1; break; 1999 case 'n': show_needed = 1; break;
643 case 'i': show_interp = 1; break; 2000 case 'i': show_interp = 1; break;
2001 case 'b': show_bind = 1; break;
2002 case 'S': show_soname = 1; break;
2003 case 'T': show_textrels = 1; break;
644 case 'q': be_quiet = 1; break; 2004 case 'q': be_quiet = 1; break;
645 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2005 case 'v': be_verbose = (be_verbose % 20) + 1; break;
646 case 'a': show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 1; break; 2006 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
647 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;
648 case ':': 2013 case ':':
649 warn("Option missing parameter\n"); 2014 err("Option '%c' is missing parameter", optopt);
650 usage(EXIT_FAILURE);
651 break;
652 case '?': 2015 case '?':
653 warn("Unknown option\n"); 2016 err("Unknown option '%c' or argument missing", optopt);
654 usage(EXIT_FAILURE);
655 break;
656 default: 2017 default:
657 err("Unhandled option '%c'", flag); 2018 err("Unhandled option '%c'; please report this", i);
658 break;
659 }
660 } 2019 }
661 2020 }
662 if (be_quiet && be_verbose) 2021 if (show_textrels && be_verbose) {
663 err("You can be quiet or you can be verbose, not both, stupid"); 2022 if (which("objdump") != NULL)
664 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);
665 /* let the format option override all other options */ 2030 /* let the format option override all other options */
666 if (out_format) { 2031 if (out_format) {
667 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0; 2032 show_pax = show_phdr = show_textrel = show_rpath = \
2033 show_needed = show_interp = show_bind = show_soname = \
2034 show_textrels = show_perms = show_endian = show_size = \
2035 show_osabi = show_eabi = 0;
668 for (flag=0; out_format[flag]; ++flag) { 2036 for (i = 0; out_format[i]; ++i) {
669 if (out_format[flag] != '%') continue; 2037 if (!IS_MODIFIER(out_format[i])) continue;
670 2038
671 switch (out_format[++flag]) { 2039 switch (out_format[++i]) {
2040 case '+': break;
672 case '%': break; 2041 case '%': break;
2042 case '#': break;
673 case 'F': break; 2043 case 'F': break;
2044 case 'p': break;
2045 case 'f': break;
2046 case 'k': break;
674 case 's': break; 2047 case 's': break;
2048 case 'N': break;
675 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;
676 case 'x': show_pax = 1; break; 2057 case 'x': show_pax = 1; break;
677 case 'e': show_stack = 1; break; 2058 case 'e': show_phdr = 1; break;
678 case 't': show_textrel = 1; break; 2059 case 't': show_textrel = 1; break;
679 case 'r': show_rpath = 1; break; 2060 case 'r': show_rpath = 1; break;
680 case 'n': show_needed = 1; break; 2061 case 'n': show_needed = 1; break;
681 case 'i': show_interp = 1; break; 2062 case 'i': show_interp = 1; break;
2063 case 'b': show_bind = 1; break;
2064 case 'S': show_soname = 1; break;
2065 case 'T': show_textrels = 1; break;
682 default: 2066 default:
683 err("Invalid format specifier '%c' (byte %i)", 2067 err("Invalid format specifier '%c' (byte %i)",
684 out_format[flag], flag+1); 2068 out_format[i], i+1);
685 } 2069 }
686 } 2070 }
687 2071
688 /* construct our default format */ 2072 /* construct our default format */
689 } else { 2073 } else {
690 size_t fmt_len = 30; 2074 size_t fmt_len = 30;
691 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2075 out_format = xmalloc(sizeof(char) * fmt_len);
2076 *out_format = '\0';
692 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2077 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
693 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);
694 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len); 2082 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2083 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2084 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
695 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2085 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
696 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2086 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
697 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2087 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
698 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2088 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2089 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2090 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2091 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
699 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);
2094 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
700 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2095 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
701 } 2096 }
702 if (be_verbose > 2) printf("Format: %s\n", out_format); 2097 if (be_verbose > 2) printf("Format: %s\n", out_format);
703 2098
704 /* now lets actually do the scanning */ 2099 /* now lets actually do the scanning */
2100 if (scan_ldpath || use_ldcache)
2101 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
705 if (scan_ldpath) scanelf_ldpath(); 2102 if (scan_ldpath) scanelf_ldpath();
706 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 = "-";
2106 if (from_file) {
2107 scanelf_from_file(from_file);
2108 from_file = *argv;
2109 }
707 if (optind == argc && !scan_ldpath && !scan_envpath) 2110 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
708 err("Nothing to scan !?"); 2111 err("Nothing to scan !?");
709 while (optind < argc) 2112 while (optind < argc) {
710 scanelf_dir(argv[optind++]); 2113 search_path = argv[optind++];
2114 ret = scanelf_dir(search_path);
2115 }
711 2116
712 /* clean up */ 2117 /* clean up */
713 if (find_sym) { 2118 xarrayfree(ldpaths);
2119 xarrayfree(find_lib_arr);
2120 xarrayfree(find_section_arr);
714 free(find_sym); 2121 free(find_lib);
715 free(versioned_symname); 2122 free(find_section);
716 }
717 if (out_format) free(out_format);
718}
719 2123
720 2124 if (ldcache != 0)
721 2125 munmap(ldcache, ldcache_size);
722/* utility funcs */
723static char *xstrdup(char *s)
724{
725 char *ret = strdup(s);
726 if (!ret) err("Could not strdup(): %s", strerror(errno));
727 return ret; 2126 return ret;
728} 2127}
729static void *xmalloc(size_t size)
730{
731 void *ret = malloc(size);
732 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
733 return ret;
734}
735static void xstrcat(char **dst, const char *src, size_t *curr_len)
736{
737 long new_len;
738 2128
739 new_len = strlen(*dst) + strlen(src); 2129static char **get_split_env(const char *envvar)
740 if (*curr_len <= new_len) {
741 *curr_len = new_len + (*curr_len / 2);
742 *dst = realloc(*dst, *curr_len);
743 if (!*dst)
744 err("could not realloc %li bytes", (unsigned long)*curr_len);
745 }
746
747 strcat(*dst, src);
748}
749static inline void xchrcat(char **dst, const char append, size_t *curr_len)
750{ 2130{
751 static char my_app[2]; 2131 const char *delims = " \t\n";
752 my_app[0] = append; 2132 char **envvals = NULL;
753 my_app[1] = '\0'; 2133 char *env, *s;
754 xstrcat(dst, my_app, curr_len); 2134 int nentry;
755} 2135
756static int xemptybuffer(const char *buff) 2136 if ((env = getenv(envvar)) == NULL)
757{
758 long i;
759 for (i=0; buff[i]; ++i)
760 if (buff[i] != ' ')
761 return 0; 2137 return NULL;
2138
2139 env = xstrdup(env);
2140 if (env == NULL)
762 return 1; 2141 return NULL;
763}
764 2142
2143 s = strtok(env, delims);
2144 if (s == NULL) {
2145 free(env);
2146 return NULL;
2147 }
765 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
766 2180
767int main(int argc, char *argv[]) 2181int main(int argc, char *argv[])
768{ 2182{
2183 int ret;
769 if (argc < 2) 2184 if (argc < 2)
770 usage(EXIT_FAILURE); 2185 usage(EXIT_FAILURE);
2186 parseenv();
771 parseargs(argc, argv); 2187 ret = parseargs(argc, argv);
772 fclose(stdout); 2188 fclose(stdout);
773 return EXIT_SUCCESS; 2189#ifdef __PAX_UTILS_CLEANUP
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");
2194#endif
2195 return ret;
774} 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}

Legend:
Removed from v.1.41  
changed lines
  Added in v.1.229

  ViewVC Help
Powered by ViewVC 1.1.20