/[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 1.32 Revision 1.209
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 1.32 2005/04/07 00:01:40 vapier Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.209 2009/03/15 08:53:29 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>
25#include <stdlib.h>
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
36#include "paxelf.h"
37
38static const char *rcsid = "$Id: scanelf.c,v 1.32 2005/04/07 00:01:40 vapier Exp $"; 10static const char *rcsid = "$Id: scanelf.c,v 1.209 2009/03/15 08:53:29 vapier Exp $";
11const char * const argv0 = "scanelf";
39 12
13#include "paxinc.h"
40 14
41/* helper functions for showing errors */ 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
42#define argv0 "scanelf" /*((*argv != NULL) ? argv[0] : __FILE__ "\b\b")*/
43#define warn(fmt, args...) \
44 fprintf(stderr, "%s: " fmt "\n", argv0, ## args)
45#define warnf(fmt, args...) warn("%s(): " fmt, __FUNCTION__, ## args)
46#define err(fmt, args...) \
47 do { \
48 warn(fmt, ## args); \
49 exit(EXIT_FAILURE); \
50 } while (0)
51
52
53 16
54/* prototypes */ 17/* prototypes */
55static void scanelf_file(const char *filename); 18static int file_matches_list(const char *filename, char **matchlist);
19static int scanelf_elfobj(elfobj *elf);
20static int scanelf_elf(const char *filename, int fd, size_t len);
21static int scanelf_archive(const char *filename, int fd, size_t len);
22static int scanelf_file(const char *filename, const struct stat *st_cache);
56static void scanelf_dir(const char *path); 23static int scanelf_dir(const char *path);
57static void scanelf_ldpath(); 24static void scanelf_ldpath(void);
58static void scanelf_envpath(); 25static void scanelf_envpath(void);
59static void usage(int status); 26static void usage(int status);
27static char **get_split_env(const char *envvar);
28static void parseenv(void);
60static void parseargs(int argc, char *argv[]); 29static int parseargs(int argc, char *argv[]);
30static int rematch(const char *regex, const char *match, int cflags);
61 31
62/* variables to control behavior */ 32/* variables to control behavior */
33static char match_etypes[126] = "";
34static char *ldpaths[256];
63static char scan_ldpath = 0; 35static char scan_ldpath = 0;
64static char scan_envpath = 0; 36static char scan_envpath = 0;
37static char scan_symlink = 1;
38static char scan_archives = 0;
65static char dir_recurse = 0; 39static char dir_recurse = 0;
66static char dir_crossmount = 1; 40static char dir_crossmount = 1;
67static char show_pax = 0; 41static char show_pax = 0;
42static char show_perms = 0;
68static char show_stack = 0; 43static char show_size = 0;
44static char show_phdr = 0;
69static char show_textrel = 0; 45static char show_textrel = 0;
70static char show_rpath = 0; 46static char show_rpath = 0;
71static char show_needed = 0; 47static char show_needed = 0;
48static char show_interp = 0;
49static char show_bind = 0;
50static char show_soname = 0;
51static char show_textrels = 0;
72static char show_banner = 1; 52static char show_banner = 1;
53static char show_endian = 0;
54static char show_osabi = 0;
55static char show_eabi = 0;
73static char be_quiet = 0; 56static char be_quiet = 0;
74static char be_verbose = 0; 57static char be_verbose = 0;
58static char be_wewy_wewy_quiet = 0;
59static char be_semi_verbose = 0;
75static char *find_sym = NULL; 60static char *find_sym = NULL;
61static char *find_lib = NULL;
62static char *find_section = NULL;
63static char *out_format = NULL;
64static char *search_path = NULL;
65static char fix_elf = 0;
66static char g_match = 0;
67static char use_ldcache = 0;
76 68
69static char **qa_textrels = NULL;
70static char **qa_execstack = NULL;
71static char **qa_wx_load = NULL;
77 72
73static int match_bits = 0;
74static unsigned int match_perms = 0;
75static caddr_t ldcache = 0;
76static size_t ldcache_size = 0;
77static unsigned long setpax = 0UL;
78 78
79/* scan an elf file and show all the fun stuff */ 79static int has_objdump = 0;
80static void scanelf_file(const char *filename)
81{
82 int i;
83 char found_pax, found_stack, found_relro, found_textrel,
84 found_rpath, found_needed, found_sym;
85 elfobj *elf;
86 80
87 found_pax = found_stack = found_relro = found_textrel = \ 81/* find the path to a file by name */
88 found_rpath = found_needed = found_sym = 0; 82static char *which(const char *fname)
83{
84 static char fullpath[__PAX_UTILS_PATH_MAX];
85 char *path, *p;
89 86
90 /* verify this is real ELF */ 87 path = getenv("PATH");
91 if ((elf = readelf(filename)) == NULL) { 88 if (!path)
92 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
93 return; 89 return NULL;
90
91 path = xstrdup(path);
92 while ((p = strrchr(path, ':')) != NULL) {
93 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
94 *p = 0;
95 if (access(fullpath, R_OK) != -1) {
96 free(path);
97 return fullpath;
94 } 98 }
95
96 if (be_verbose > 1)
97 printf("%s: {%s,%s} scanning file\n", filename,
98 get_elfeitype(elf, EI_CLASS, elf->elf_class),
99 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA]));
100 else if (be_verbose)
101 printf("%s: scanning file\n", filename);
102
103 /* show the header */
104 if (!be_quiet && show_banner) {
105 printf(" TYPE ");
106 if (show_pax) printf(" PAX ");
107 if (show_stack) printf("STK/REL ");
108 if (show_textrel) printf("TEXTREL ");
109 if (show_rpath) printf("RPATH ");
110 if (show_needed) printf("NEEDED ");
111 printf(" FILE\n");
112 show_banner = 0;
113 }
114
115 /* dump all the good stuff */
116 if (!be_quiet)
117 printf("%-7s ", get_elfetype(elf));
118
119 if (show_pax) {
120 char *paxflags = pax_short_hf_flags(PAX_FLAGS(elf));
121 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) {
122 found_pax = 1;
123 printf("%s ", pax_short_hf_flags(PAX_FLAGS(elf)));
124 } 99 }
125 } 100 free(path);
101 return NULL;
102}
126 103
127 /* stack fun */ 104/* 1 on failure. 0 otherwise */
128 if (show_stack) { 105static int rematch(const char *regex, const char *match, int cflags)
129#define SHOW_STACK(B) \ 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/* sub-funcs for scanelf_file() */
130static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
131{
132 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
133#define GET_SYMTABS(B) \
130 if (elf->elf_class == ELFCLASS ## B) { \ 134 if (elf->elf_class == ELFCLASS ## B) { \
135 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
136 /* debug sections */ \
137 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
138 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
139 /* runtime sections */ \
140 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
141 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
142 if (symtab && dynsym) { \
143 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
144 } else { \
145 *sym = (void*)(symtab ? symtab : dynsym); \
146 } \
147 if (strtab && dynstr) { \
148 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
149 } else { \
150 *tab = (void*)(strtab ? strtab : dynstr); \
151 } \
152 }
153 GET_SYMTABS(32)
154 GET_SYMTABS(64)
155}
156
157static char *scanelf_file_pax(elfobj *elf, char *found_pax)
158{
159 static char ret[7];
160 unsigned long i, shown;
161
162 if (!show_pax) return NULL;
163
164 shown = 0;
165 memset(&ret, 0, sizeof(ret));
166
167 if (elf->phdr) {
168#define SHOW_PAX(B) \
169 if (elf->elf_class == ELFCLASS ## B) { \
131 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 170 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
171 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
172 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
173 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
174 continue; \
175 if (fix_elf && setpax) { \
176 /* set the paxctl flags */ \
177 ESET(phdr[i].p_flags, setpax); \
178 } \
179 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
180 continue; \
181 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
182 *found_pax = 1; \
183 ++shown; \
184 break; \
185 } \
186 }
187 SHOW_PAX(32)
188 SHOW_PAX(64)
189 }
190
191 if (fix_elf && setpax) {
192 /* set the chpax settings */
193 if (elf->elf_class == ELFCLASS32) {
194 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
195 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
196 } else {
197 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
198 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
199 }
200 }
201
202 /* fall back to EI_PAX if no PT_PAX was found */
203 if (!*ret) {
204 static char *paxflags;
205 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
206 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
207 *found_pax = 1;
208 return (be_wewy_wewy_quiet ? NULL : paxflags);
209 }
210 strncpy(ret, paxflags, sizeof(ret));
211 }
212
213 if (be_wewy_wewy_quiet || (be_quiet && !shown))
214 return NULL;
215 else
216 return ret;
217}
218
219static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
220{
221 static char ret[12];
222 char *found;
223 unsigned long i, shown, multi_stack, multi_relro, multi_load;
224 int max_pt_load;
225
226 if (!show_phdr) return NULL;
227
228 memcpy(ret, "--- --- ---\0", 12);
229
230 shown = 0;
231 multi_stack = multi_relro = multi_load = 0;
232 max_pt_load = elf_max_pt_load(elf);
233
234#define NOTE_GNU_STACK ".note.GNU-stack"
235#define SHOW_PHDR(B) \
236 if (elf->elf_class == ELFCLASS ## B) { \
237 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
238 Elf ## B ## _Off offset; \
239 uint32_t flags, check_flags; \
240 if (elf->phdr != NULL) { \
132 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 241 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
133 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 242 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
134 if (EGET(phdr[i].p_type) != PT_GNU_STACK && \ 243 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
244 if (multi_stack++) \
245 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
246 if (file_matches_list(elf->filename, qa_execstack)) \
247 continue; \
248 found = found_phdr; \
249 offset = 0; \
250 check_flags = PF_X; \
135 EGET(phdr[i].p_type) != PT_GNU_RELRO) continue; \ 251 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
136 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ 252 if (multi_relro++) \
253 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
254 found = found_relro; \
255 offset = 4; \
256 check_flags = PF_X; \
257 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
258 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
259 if (multi_load++ > max_pt_load) \
260 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
261 if (file_matches_list(elf->filename, qa_wx_load)) \
262 continue; \
263 found = found_load; \
264 offset = 8; \
265 check_flags = PF_W|PF_X; \
266 } else \
137 continue; \ 267 continue; \
138 if (EGET(phdr[i].p_type) == PT_GNU_STACK) \ 268 flags = EGET(phdr[i].p_flags); \
269 if (be_quiet && ((flags & check_flags) != check_flags)) \
270 continue; \
271 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
272 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
273 ret[3] = ret[7] = '!'; \
274 flags = EGET(phdr[i].p_flags); \
275 } \
276 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
139 found_stack = 1; \ 277 *found = 1; \
140 if (EGET(phdr[i].p_type) == PT_GNU_RELRO) \ 278 ++shown; \
141 found_relro = 1; \
142 printf("%s ", gnu_short_stack_flags(EGET(phdr[i].p_flags))); \
143 } \ 279 } \
280 } else if (elf->shdr != NULL) { \
281 /* no program headers which means this is prob an object file */ \
282 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
283 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
284 char *str; \
285 if ((void*)strtbl > (void*)elf->data_end) \
286 goto skip_this_shdr##B; \
287 check_flags = SHF_WRITE|SHF_EXECINSTR; \
288 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
289 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
290 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
291 str = elf->data + offset; \
292 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
293 if (!strcmp(str, NOTE_GNU_STACK)) { \
294 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
295 flags = EGET(shdr[i].sh_flags); \
296 if (be_quiet && ((flags & check_flags) != check_flags)) \
297 continue; \
298 ++*found_phdr; \
299 shown = 1; \
300 if (flags & SHF_WRITE) ret[0] = 'W'; \
301 if (flags & SHF_ALLOC) ret[1] = 'A'; \
302 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
303 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
304 break; \
305 } \
306 } \
307 skip_this_shdr##B: \
308 if (!multi_stack) { \
309 if (file_matches_list(elf->filename, qa_execstack)) \
310 return NULL; \
311 *found_phdr = 1; \
312 shown = 1; \
313 memcpy(ret, "!WX", 3); \
314 } \
315 } \
144 } 316 }
145 SHOW_STACK(32) 317 SHOW_PHDR(32)
146 SHOW_STACK(64) 318 SHOW_PHDR(64)
147 if (!be_quiet && !found_stack) printf("--- ");
148 if (!be_quiet && !found_relro) printf("--- ");
149 }
150 319
151 /* textrel fun */ 320 if (be_wewy_wewy_quiet || (be_quiet && !shown))
152 if (show_textrel) { 321 return NULL;
322 else
323 return ret;
324}
325
326/*
327 * See if this ELF contains a DT_TEXTREL tag in any of its
328 * PT_DYNAMIC sections.
329 */
330static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
331{
332 static const char *ret = "TEXTREL";
333 unsigned long i;
334
335 if (!show_textrel && !show_textrels) return NULL;
336
337 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
338
339 if (elf->phdr) {
153#define SHOW_TEXTREL(B) \ 340#define SHOW_TEXTREL(B) \
154 if (elf->elf_class == ELFCLASS ## B) { \ 341 if (elf->elf_class == ELFCLASS ## B) { \
155 Elf ## B ## _Dyn *dyn; \ 342 Elf ## B ## _Dyn *dyn; \
156 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 343 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
157 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 344 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
345 Elf ## B ## _Off offset; \
158 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 346 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
159 if (phdr[i].p_type != PT_DYNAMIC) continue; \ 347 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
348 offset = EGET(phdr[i].p_offset); \
349 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
160 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 350 dyn = DYN ## B (elf->data + offset); \
161 while (EGET(dyn->d_tag) != DT_NULL) { \ 351 while (EGET(dyn->d_tag) != DT_NULL) { \
162 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 352 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
163 found_textrel = 1; \ 353 *found_textrel = 1; \
164 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 354 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
165 printf("TEXTREL "); \ 355 return (be_wewy_wewy_quiet ? NULL : ret); \
356 } \
357 ++dyn; \
358 } \
359 } }
360 SHOW_TEXTREL(32)
361 SHOW_TEXTREL(64)
362 }
363
364 if (be_quiet || be_wewy_wewy_quiet)
365 return NULL;
366 else
367 return " - ";
368}
369
370/*
371 * Scan the .text section to see if there are any relocations in it.
372 * Should rewrite this to check PT_LOAD sections that are marked
373 * Executable rather than the section named '.text'.
374 */
375static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
376{
377 unsigned long s, r, rmax;
378 void *symtab_void, *strtab_void, *text_void;
379
380 if (!show_textrels) return NULL;
381
382 /* don't search for TEXTREL's if the ELF doesn't have any */
383 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
384 if (!*found_textrel) return NULL;
385
386 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
387 text_void = elf_findsecbyname(elf, ".text");
388
389 if (symtab_void && strtab_void && text_void && elf->shdr) {
390#define SHOW_TEXTRELS(B) \
391 if (elf->elf_class == ELFCLASS ## B) { \
392 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
393 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
394 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
395 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
396 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
397 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
398 uint ## B ## _t memsz = EGET(text->sh_size); \
399 Elf ## B ## _Rel *rel; \
400 Elf ## B ## _Rela *rela; \
401 /* search the section headers for relocations */ \
402 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
403 uint32_t sh_type = EGET(shdr[s].sh_type); \
404 if (sh_type == SHT_REL) { \
405 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
406 rela = NULL; \
407 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
408 } else if (sh_type == SHT_RELA) { \
409 rel = NULL; \
410 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
411 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
412 } else \
413 continue; \
414 /* now see if any of the relocs are in the .text */ \
415 for (r = 0; r < rmax; ++r) { \
416 unsigned long sym_max; \
417 Elf ## B ## _Addr offset_tmp; \
418 Elf ## B ## _Sym *func; \
419 Elf ## B ## _Sym *sym; \
420 Elf ## B ## _Addr r_offset; \
421 uint ## B ## _t r_info; \
422 if (sh_type == SHT_REL) { \
423 r_offset = EGET(rel[r].r_offset); \
424 r_info = EGET(rel[r].r_info); \
425 } else { \
426 r_offset = EGET(rela[r].r_offset); \
427 r_info = EGET(rela[r].r_info); \
428 } \
429 /* make sure this relocation is inside of the .text */ \
430 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
431 if (be_verbose <= 2) continue; \
432 } else \
433 *found_textrels = 1; \
434 /* locate this relocation symbol name */ \
435 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
436 if ((void*)sym > (void*)elf->data_end) { \
437 warn("%s: corrupt ELF symbol", elf->filename); \
438 continue; \
439 } \
440 sym_max = ELF ## B ## _R_SYM(r_info); \
441 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
442 sym += sym_max; \
443 else \
444 sym = NULL; \
445 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
446 /* show the raw details about this reloc */ \
447 printf(" %s: ", elf->base_filename); \
448 if (sym && sym->st_name) \
449 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
450 else \
451 printf("(memory/data?)"); \
452 printf(" [0x%lX]", (unsigned long)r_offset); \
453 /* now try to find the closest symbol that this rel is probably in */ \
454 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
455 func = NULL; \
456 offset_tmp = 0; \
457 while (sym_max--) { \
458 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
459 func = sym; \
460 offset_tmp = EGET(sym->st_value); \
166 } \ 461 } \
167 ++dyn; \ 462 ++sym; \
168 } \ 463 } \
464 printf(" in "); \
465 if (func && func->st_name) { \
466 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
467 if (r_offset > EGET(func->st_size)) \
468 printf("(optimized out: previous %s)", func_name); \
469 else \
470 printf("%s", func_name); \
471 } else \
472 printf("(optimized out)"); \
473 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
474 if (be_verbose && has_objdump) { \
475 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
476 char *sysbuf; \
477 size_t syslen; \
478 int sysret; \
479 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"; \
480 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
481 sysbuf = xmalloc(syslen); \
482 if (end_addr < r_offset) \
483 /* not uncommon when things are optimized out */ \
484 end_addr = r_offset + 0x100; \
485 snprintf(sysbuf, syslen, sysfmt, \
486 (unsigned long)offset_tmp, \
487 (unsigned long)end_addr, \
488 elf->filename, \
489 (unsigned long)r_offset); \
490 fflush(stdout); \
491 sysret = system(sysbuf); \
492 fflush(stdout); \
493 free(sysbuf); \
494 } \
495 } \
169 } } 496 } }
170 SHOW_TEXTREL(32) 497 SHOW_TEXTRELS(32)
171 SHOW_TEXTREL(64) 498 SHOW_TEXTRELS(64)
172 if (!be_quiet && !found_textrel) printf("------- ");
173 } 499 }
500 if (!*found_textrels)
501 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
174 502
175 /* rpath fun */ 503 return NULL;
176 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */ 504}
177 if (show_rpath) { 505
506static void rpath_security_checks(elfobj *, char *, const char *);
507static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
508{
509 struct stat st;
510 switch (*item) {
511 case '/': break;
512 case '.':
513 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
514 break;
515 case ':':
516 case '\0':
517 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
518 break;
519 case '$':
520 if (fstat(elf->fd, &st) != -1)
521 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
522 warnf("Security problem with %s='%s' in %s with mode set of %o",
523 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
524 break;
525 default:
526 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
527 break;
528 }
529}
530static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
531{
532 unsigned long i, s;
178 char *rpath, *runpath; 533 char *rpath, *runpath, **r;
534 void *strtbl_void;
535
536 if (!show_rpath) return;
537
179 void *strtbl_void = elf_findsecbyname(elf, ".dynstr"); 538 strtbl_void = elf_findsecbyname(elf, ".dynstr");
180 rpath = runpath = NULL; 539 rpath = runpath = NULL;
181 540
182 if (strtbl_void) { 541 if (elf->phdr && strtbl_void) {
183#define SHOW_RPATH(B) \ 542#define SHOW_RPATH(B) \
184 if (elf->elf_class == ELFCLASS ## B) { \ 543 if (elf->elf_class == ELFCLASS ## B) { \
185 Elf ## B ## _Dyn *dyn; \ 544 Elf ## B ## _Dyn *dyn; \
186 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 545 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
187 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 546 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
188 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 547 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
548 Elf ## B ## _Off offset; \
549 Elf ## B ## _Xword word; \
550 /* Scan all the program headers */ \
189 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 551 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
552 /* Just scan dynamic headers */ \
190 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 553 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
554 offset = EGET(phdr[i].p_offset); \
555 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
556 /* Just scan dynamic RPATH/RUNPATH headers */ \
191 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 557 dyn = DYN ## B (elf->data + offset); \
192 while (EGET(dyn->d_tag) != DT_NULL) { \ 558 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
193 if (EGET(dyn->d_tag) == DT_RPATH) { \ 559 if (word == DT_RPATH) { \
560 r = &rpath; \
561 } else if (word == DT_RUNPATH) { \
562 r = &runpath; \
563 } else { \
564 ++dyn; \
565 continue; \
566 } \
567 /* Verify the memory is somewhat sane */ \
194 rpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 568 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
569 if (offset < (Elf ## B ## _Off)elf->len) { \
570 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
571 *r = (char*)(elf->data + offset); \
572 /* cache the length in case we need to nuke this section later on */ \
573 if (fix_elf) \
574 offset = strlen(*r); \
575 /* If quiet, don't output paths in ld.so.conf */ \
576 if (be_quiet) { \
577 size_t len; \
578 char *start, *end; \
579 /* note that we only 'chop' off leading known paths. */ \
580 /* since *r is read-only memory, we can only move the ptr forward. */ \
581 start = *r; \
582 /* scan each path in : delimited list */ \
583 while (start) { \
584 rpath_security_checks(elf, start, get_elfdtype(word)); \
585 end = strchr(start, ':'); \
586 len = (end ? abs(end - start) : strlen(start)); \
587 if (use_ldcache) \
588 for (s = 0; ldpaths[s]; ++s) \
589 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
590 *r = end; \
591 /* corner case ... if RPATH reads "/usr/lib:", we want \
592 * to show ':' rather than '' */ \
593 if (end && end[1] != '\0') \
594 (*r)++; \
595 break; \
596 } \
597 if (!*r || !end) \
598 break; \
599 else \
600 start = start + len + 1; \
601 } \
602 } \
603 if (*r) { \
604 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
605 /* just nuke it */ \
606 nuke_it##B: \
607 memset(*r, 0x00, offset); \
608 *r = NULL; \
609 ESET(dyn->d_tag, DT_DEBUG); \
610 ESET(dyn->d_un.d_ptr, 0); \
611 } else if (fix_elf) { \
612 /* try to clean "bad" paths */ \
613 size_t len, tmpdir_len; \
614 char *start, *end; \
615 const char *tmpdir; \
616 start = *r; \
617 tmpdir = (getenv("TMPDIR") ? : "."); \
618 tmpdir_len = strlen(tmpdir); \
619 while (1) { \
620 end = strchr(start, ':'); \
621 if (start == end) { \
622 eat_this_path##B: \
623 len = strlen(end); \
624 memmove(start, end+1, len); \
625 start[len-1] = '\0'; \
626 end = start - 1; \
627 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
628 if (!end) { \
629 if (start == *r) \
630 goto nuke_it##B; \
631 *--start = '\0'; \
632 } else \
633 goto eat_this_path##B; \
634 } \
635 if (!end) \
636 break; \
637 start = end + 1; \
638 } \
639 if (**r == '\0') \
640 goto nuke_it##B; \
641 } \
642 if (*r) \
195 found_rpath = 1; \ 643 *found_rpath = 1; \
196 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \ 644 } \
197 runpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
198 found_rpath = 1; \
199 } \ 645 } \
200 ++dyn; \ 646 ++dyn; \
201 } \ 647 } \
202 } } 648 } }
203 SHOW_RPATH(32) 649 SHOW_RPATH(32)
204 SHOW_RPATH(64) 650 SHOW_RPATH(64)
205 } 651 }
652
653 if (be_wewy_wewy_quiet) return;
654
206 if (rpath && runpath) { 655 if (rpath && runpath) {
207 if (!strcmp(rpath, runpath)) 656 if (!strcmp(rpath, runpath)) {
208 printf("%-5s ", runpath); 657 xstrcat(ret, runpath, ret_len);
209 else { 658 } else {
210 fprintf(stderr, "%s's RPATH [%s] != RUNPATH [%s]\n", filename, rpath, runpath); 659 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
211 printf("{%s,%s} ", rpath, runpath); 660 xchrcat(ret, '{', ret_len);
661 xstrcat(ret, rpath, ret_len);
662 xchrcat(ret, ',', ret_len);
663 xstrcat(ret, runpath, ret_len);
664 xchrcat(ret, '}', ret_len);
212 } 665 }
213 } else if (rpath || runpath) 666 } else if (rpath || runpath)
214 printf("%-5s ", (runpath ? runpath : rpath)); 667 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
215 else if (!be_quiet && !found_rpath) 668 else if (!be_quiet)
216 printf(" - "); 669 xstrcat(ret, " - ", ret_len);
670}
671
672#define LDSO_CACHE_MAGIC "ld.so-"
673#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
674#define LDSO_CACHE_VER "1.7.0"
675#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
676#define FLAG_ANY -1
677#define FLAG_TYPE_MASK 0x00ff
678#define FLAG_LIBC4 0x0000
679#define FLAG_ELF 0x0001
680#define FLAG_ELF_LIBC5 0x0002
681#define FLAG_ELF_LIBC6 0x0003
682#define FLAG_REQUIRED_MASK 0xff00
683#define FLAG_SPARC_LIB64 0x0100
684#define FLAG_IA64_LIB64 0x0200
685#define FLAG_X8664_LIB64 0x0300
686#define FLAG_S390_LIB64 0x0400
687#define FLAG_POWERPC_LIB64 0x0500
688#define FLAG_MIPS64_LIBN32 0x0600
689#define FLAG_MIPS64_LIBN64 0x0700
690
691static char *lookup_cache_lib(elfobj *, char *);
692
693#if defined(__GLIBC__) || defined(__UCLIBC__)
694
695static char *lookup_cache_lib(elfobj *elf, char *fname)
696{
697 int fd = 0;
698 char *strs;
699 static char buf[__PAX_UTILS_PATH_MAX] = "";
700 const char *cachefile = "/etc/ld.so.cache";
701 struct stat st;
702
703 typedef struct {
704 char magic[LDSO_CACHE_MAGIC_LEN];
705 char version[LDSO_CACHE_VER_LEN];
706 int nlibs;
707 } header_t;
708 header_t *header;
709
710 typedef struct {
711 int flags;
712 int sooffset;
713 int liboffset;
714 } libentry_t;
715 libentry_t *libent;
716
717 if (fname == NULL)
718 return NULL;
719
720 if (ldcache == 0) {
721 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
722 return NULL;
723
724 /* cache these values so we only map/unmap the cache file once */
725 ldcache_size = st.st_size;
726 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
727
728 close(fd);
729
730 if (ldcache == MAP_FAILED) {
731 ldcache = 0;
732 return NULL;
217 } 733 }
218 734
219 /* print out all the NEEDED entries */ 735 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
220 if (show_needed) { 736 return NULL;
737 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
738 return NULL;
739 }
740
741 header = (header_t *) ldcache;
742 libent = (libentry_t *) (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 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
750 continue;
751 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
752 continue;
753
754 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
755 continue;
756 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
757 }
758 return buf;
759}
760#elif defined(__NetBSD__)
761static char *lookup_cache_lib(elfobj *elf, char *fname)
762{
763 static char buf[__PAX_UTILS_PATH_MAX] = "";
764 static struct stat st;
765
766 char **ldpath;
767 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
768 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
769 continue; /* if the pathname is too long, or something went wrong, ignore */
770
771 if (stat(buf, &st) != 0)
772 continue; /* if the lib doesn't exist in *ldpath, look further */
773
774 /* NetBSD doesn't actually do sanity checks, it just loads the file
775 * and if that doesn't work, continues looking in other directories.
776 * This cannot easily be safely emulated, unfortunately. For now,
777 * just assume that if it exists, it's a valid library. */
778
779 return buf;
780 }
781
782 /* not found in any path */
783 return NULL;
784}
785#else
786#ifdef __ELF__
787#warning Cache support not implemented for your target
788#endif
789static char *lookup_cache_lib(elfobj *elf, char *fname)
790{
791 return NULL;
792}
793#endif
794
795static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
796{
797 unsigned long i;
221 char *needed; 798 char *needed;
799 void *strtbl_void;
800 char *p;
801
802 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
803
222 void *strtbl_void = elf_findsecbyname(elf, ".dynstr"); 804 strtbl_void = elf_findsecbyname(elf, ".dynstr");
223 805
224 if (strtbl_void) { 806 if (elf->phdr && strtbl_void) {
225#define SHOW_NEEDED(B) \ 807#define SHOW_NEEDED(B) \
226 if (elf->elf_class == ELFCLASS ## B) { \ 808 if (elf->elf_class == ELFCLASS ## B) { \
227 Elf ## B ## _Dyn *dyn; \ 809 Elf ## B ## _Dyn *dyn; \
228 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 810 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
229 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 811 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
230 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 812 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
813 Elf ## B ## _Off offset; \
231 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 814 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
232 if (be_verbose && EGET(phdr[i].p_type) == PT_INTERP) { \
233 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
234 printf("%s\n", elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr)); \
235 exit(0); \
236 } \
237 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 815 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
816 offset = EGET(phdr[i].p_offset); \
817 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
238 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 818 dyn = DYN ## B (elf->data + offset); \
239 while (EGET(dyn->d_tag) != DT_NULL) { \ 819 while (EGET(dyn->d_tag) != DT_NULL) { \
240 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 820 if (EGET(dyn->d_tag) == DT_NEEDED) { \
241 needed = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 821 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
242 if (found_needed) printf(","); \ 822 if (offset >= (Elf ## B ## _Off)elf->len) { \
243 printf("%s", needed); \ 823 ++dyn; \
824 continue; \
825 } \
826 needed = (char*)(elf->data + offset); \
827 if (op == 0) { \
828 if (!be_wewy_wewy_quiet) { \
829 if (*found_needed) xchrcat(ret, ',', ret_len); \
830 if (use_ldcache) \
831 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
832 needed = p; \
833 xstrcat(ret, needed, ret_len); \
834 } \
244 found_needed = 1; \ 835 *found_needed = 1; \
836 } else { \
837 if (!strncmp(find_lib, needed, strlen( !g_match ? needed : find_lib))) { \
838 *found_lib = 1; \
839 return (be_wewy_wewy_quiet ? NULL : needed); \
840 } \
841 } \
245 } \ 842 } \
246 ++dyn; \ 843 ++dyn; \
247 } \ 844 } \
248 } } 845 } }
249 SHOW_NEEDED(32) 846 SHOW_NEEDED(32)
250 SHOW_NEEDED(64) 847 SHOW_NEEDED(64)
848 if (op == 0 && !*found_needed && be_verbose)
849 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
251 } 850 }
252 if (!be_quiet && !found_needed) 851
253 printf(" - "); 852 return NULL;
254 else if (found_needed) 853}
255 printf(" "); 854static char *scanelf_file_interp(elfobj *elf, char *found_interp)
855{
856 void *strtbl_void;
857
858 if (!show_interp) return NULL;
859
860 strtbl_void = elf_findsecbyname(elf, ".interp");
861
862 if (strtbl_void) {
863#define SHOW_INTERP(B) \
864 if (elf->elf_class == ELFCLASS ## B) { \
865 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
866 *found_interp = 1; \
867 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
256 } 868 }
869 SHOW_INTERP(32)
870 SHOW_INTERP(64)
871 }
872 return NULL;
873}
874static char *scanelf_file_bind(elfobj *elf, char *found_bind)
875{
876 unsigned long i;
877 struct stat s;
878 char dynamic = 0;
257 879
258 /* search the symbol table for a specified symbol */ 880 if (!show_bind) return NULL;
259 if (find_sym) { 881 if (!elf->phdr) return NULL;
882
883#define SHOW_BIND(B) \
884 if (elf->elf_class == ELFCLASS ## B) { \
885 Elf ## B ## _Dyn *dyn; \
886 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
887 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
888 Elf ## B ## _Off offset; \
889 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
890 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
891 dynamic = 1; \
892 offset = EGET(phdr[i].p_offset); \
893 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
894 dyn = DYN ## B (elf->data + offset); \
895 while (EGET(dyn->d_tag) != DT_NULL) { \
896 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
897 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
898 { \
899 if (be_quiet) return NULL; \
900 *found_bind = 1; \
901 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
902 } \
903 ++dyn; \
904 } \
905 } \
906 }
907 SHOW_BIND(32)
908 SHOW_BIND(64)
909
910 if (be_wewy_wewy_quiet) return NULL;
911
912 /* don't output anything if quiet mode and the ELF is static or not setuid */
913 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
914 return NULL;
915 } else {
916 *found_bind = 1;
917 return (char *) (dynamic ? "LAZY" : "STATIC");
918 }
919}
920static char *scanelf_file_soname(elfobj *elf, char *found_soname)
921{
922 unsigned long i;
923 char *soname;
924 void *strtbl_void;
925
926 if (!show_soname) return NULL;
927
928 strtbl_void = elf_findsecbyname(elf, ".dynstr");
929
930 if (elf->phdr && strtbl_void) {
931#define SHOW_SONAME(B) \
932 if (elf->elf_class == ELFCLASS ## B) { \
933 Elf ## B ## _Dyn *dyn; \
934 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
935 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
936 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
937 Elf ## B ## _Off offset; \
938 /* only look for soname in shared objects */ \
939 if (EGET(ehdr->e_type) != ET_DYN) \
940 return NULL; \
941 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
942 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
943 offset = EGET(phdr[i].p_offset); \
944 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
945 dyn = DYN ## B (elf->data + offset); \
946 while (EGET(dyn->d_tag) != DT_NULL) { \
947 if (EGET(dyn->d_tag) == DT_SONAME) { \
948 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
949 if (offset >= (Elf ## B ## _Off)elf->len) { \
950 ++dyn; \
951 continue; \
952 } \
953 soname = (char*)(elf->data + offset); \
954 *found_soname = 1; \
955 return (be_wewy_wewy_quiet ? NULL : soname); \
956 } \
957 ++dyn; \
958 } \
959 } }
960 SHOW_SONAME(32)
961 SHOW_SONAME(64)
962 }
963
964 return NULL;
965}
966
967static int scanelf_match_symname(const char *symname, const char *tomatch) {
968 /* We do things differently when checking with regexp */
969 if (g_match) {
970 return rematch(symname, tomatch, REG_EXTENDED) == 0;
971 } else {
972 const size_t symname_len = strlen(symname);
973 return (strncmp(symname, tomatch, symname_len) == 0 &&
974 /* Accept unversioned symbol names */
975 (tomatch[symname_len] == '\0' || tomatch[symname_len] == '@'));
976 }
977}
978
979static char *scanelf_file_sym(elfobj *elf, char *found_sym)
980{
981 unsigned long i;
982 char *ret;
260 void *symtab_void, *strtab_void; 983 void *symtab_void, *strtab_void;
261 char *versioned_symname;
262 size_t len;
263 984
264 len = strlen(find_sym) + 1; 985 if (!find_sym) return NULL;
265 versioned_symname = (char *)malloc(sizeof(char) * (len+1)); 986 ret = find_sym;
266 if (!versioned_symname) {
267 warnf("Could not malloc() mem for sym scan");
268 return;
269 }
270 sprintf(versioned_symname, "%s@", find_sym);
271 987
272 symtab_void = elf_findsecbyname(elf, ".symtab"); 988 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
273 strtab_void = elf_findsecbyname(elf, ".strtab");
274 989
275 if (symtab_void && strtab_void) { 990 if (symtab_void && strtab_void) {
276#define FIND_SYM(B) \ 991#define FIND_SYM(B) \
277 if (elf->elf_class == ELFCLASS ## B) { \ 992 if (elf->elf_class == ELFCLASS ## B) { \
278 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 993 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
279 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 994 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
280 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 995 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
281 int cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 996 unsigned long cnt = EGET(symtab->sh_entsize); \
282 char *symname; \ 997 char *symname; \
998 if (cnt) \
999 cnt = EGET(symtab->sh_size) / cnt; \
283 for (i = 0; i < cnt; ++i) { \ 1000 for (i = 0; i < cnt; ++i) { \
1001 if ((void*)sym > (void*)elf->data_end) { \
1002 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1003 goto break_out; \
1004 } \
284 if (sym->st_name) { \ 1005 if (sym->st_name) { \
1006 /* make sure the symbol name is in acceptable memory range */ \
285 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1007 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
286 if (*find_sym == '*') { \ 1008 if ((void*)symname > (void*)elf->data_end) { \
1009 warnf("%s: corrupt ELF symbols", elf->filename); \
1010 ++sym; \
1011 continue; \
1012 } \
1013 /* debug display ... show all symbols and some extra info */ \
1014 if (0 && g_match ? rematch(ret, symname, REG_EXTENDED) == 0 : *ret == '*') { \
287 printf("%s(%s) %5lX %15s %s\n", \ 1015 printf("%s(%s) %5lX %15s %s %s\n", \
288 ((found_sym == 0) ? "\n\t" : "\t"), \ 1016 ((*found_sym == 0) ? "\n\t" : "\t"), \
289 (char *)basename(filename), \ 1017 elf->base_filename, \
290 (long)sym->st_size, \ 1018 (unsigned long)sym->st_size, \
291 (char *)get_elfstttype(sym->st_info), \ 1019 get_elfstttype(sym->st_info), \
292 symname); \ 1020 sym->st_shndx == SHN_UNDEF ? "U" : "D", symname); \
293 found_sym = 1; \ 1021 *found_sym = 1; \
294 } else if ((strcmp(find_sym, symname) == 0) || \ 1022 } else { \
295 (strncmp(symname, versioned_symname, len) == 0)) \ 1023 /* allow the user to specify a comma delimited list of symbols to search for */ \
1024 char *this_sym, *next_sym; \
1025 next_sym = ret; \
1026 while (next_sym) { \
1027 this_sym = next_sym; \
1028 if ((next_sym = strchr(this_sym, ','))) \
1029 next_sym += 1; /* Skip the comma */ \
1030 /* do we want a defined symbol ? */ \
1031 if (*this_sym == '+') { \
1032 if (sym->st_shndx == SHN_UNDEF) \
1033 continue; \
1034 ++this_sym; \
1035 /* do we want an undefined symbol ? */ \
1036 } else if (*this_sym == '-') { \
1037 if (sym->st_shndx != SHN_UNDEF) \
1038 continue; \
1039 ++this_sym; \
1040 } \
1041 if (next_sym) /* Copy it so that we don't have to worry about the final , */ \
1042 this_sym = xstrndup(this_sym, next_sym-this_sym); \
1043 /* ok, lets compare the name now */ \
1044 if (scanelf_match_symname(this_sym, symname)) { \
1045 if (be_semi_verbose) { \
1046 char buf[126]; \
1047 snprintf(buf, sizeof(buf), "%lX %s %s", \
1048 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
1049 ret = buf; \
1050 } else \
1051 ret = symname; \
296 found_sym++; \ 1052 (*found_sym)++; \
1053 goto break_out; \
1054 } \
1055 if (next_sym) free(this_sym); \
1056 } \
1057 } \
297 } \ 1058 } \
298 ++sym; \ 1059 ++sym; \
299 } } 1060 } }
300 FIND_SYM(32) 1061 FIND_SYM(32)
301 FIND_SYM(64) 1062 FIND_SYM(64)
1063 }
1064
1065break_out:
1066 if (be_wewy_wewy_quiet) return NULL;
1067
1068 if (*find_sym != '*' && *found_sym)
1069 return ret;
1070 if (be_quiet)
1071 return NULL;
1072 else
1073 return (char *)" - ";
1074}
1075
1076static char *scanelf_file_sections(elfobj *elf, char *found_section)
1077{
1078 if (!find_section)
1079 return NULL;
1080
1081#define FIND_SECTION(B) \
1082 if (elf->elf_class == ELFCLASS ## B) { \
1083 int invert; \
1084 Elf ## B ## _Shdr *section; \
1085 invert = (*find_section == '!' ? 1 : 0); \
1086 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1087 if ((section == NULL && invert) || (section != NULL && !invert)) \
1088 *found_section = 1; \
1089 }
1090 FIND_SECTION(32)
1091 FIND_SECTION(64)
1092
1093 if (be_wewy_wewy_quiet)
1094 return NULL;
1095
1096 if (*found_section)
1097 return find_section;
1098
1099 if (be_quiet)
1100 return NULL;
1101 else
1102 return (char *)" - ";
1103}
1104
1105/* scan an elf file and show all the fun stuff */
1106#define prints(str) write(fileno(stdout), str, strlen(str))
1107static int scanelf_elfobj(elfobj *elf)
1108{
1109 unsigned long i;
1110 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1111 found_rpath, found_needed, found_interp, found_bind, found_soname,
1112 found_sym, found_lib, found_file, found_textrels, found_section;
1113 static char *out_buffer = NULL;
1114 static size_t out_len;
1115
1116 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1117 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1118 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1119
1120 if (be_verbose > 2)
1121 printf("%s: scanning file {%s,%s}\n", elf->filename,
1122 get_elfeitype(EI_CLASS, elf->elf_class),
1123 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1124 else if (be_verbose > 1)
1125 printf("%s: scanning file\n", elf->filename);
1126
1127 /* init output buffer */
1128 if (!out_buffer) {
1129 out_len = sizeof(char) * 80;
1130 out_buffer = xmalloc(out_len);
1131 }
1132 *out_buffer = '\0';
1133
1134 /* show the header */
1135 if (!be_quiet && show_banner) {
1136 for (i = 0; out_format[i]; ++i) {
1137 if (!IS_MODIFIER(out_format[i])) continue;
1138
1139 switch (out_format[++i]) {
1140 case '+': break;
1141 case '%': break;
1142 case '#': break;
1143 case 'F':
1144 case 'p':
1145 case 'f': prints("FILE "); found_file = 1; break;
1146 case 'o': prints(" TYPE "); break;
1147 case 'x': prints(" PAX "); break;
1148 case 'e': prints("STK/REL/PTL "); break;
1149 case 't': prints("TEXTREL "); break;
1150 case 'r': prints("RPATH "); break;
1151 case 'M': prints("CLASS "); break;
1152 case 'n': prints("NEEDED "); break;
1153 case 'i': prints("INTERP "); break;
1154 case 'b': prints("BIND "); break;
1155 case 'Z': prints("SIZE "); break;
1156 case 'S': prints("SONAME "); break;
1157 case 's': prints("SYM "); break;
1158 case 'N': prints("LIB "); break;
1159 case 'T': prints("TEXTRELS "); break;
1160 case 'k': prints("SECTION "); break;
1161 case 'a': prints("ARCH "); break;
1162 case 'I': prints("OSABI "); break;
1163 case 'Y': prints("EABI "); break;
1164 case 'O': prints("PERM "); break;
1165 case 'D': prints("ENDIAN "); break;
1166 default: warnf("'%c' has no title ?", out_format[i]);
302 } 1167 }
303 free(versioned_symname); 1168 }
304 if (*find_sym != '*') { 1169 if (!found_file) prints("FILE ");
305 if (found_sym) 1170 prints("\n");
306 printf(" %s ", find_sym); 1171 found_file = 0;
307 else if (!be_quiet) 1172 show_banner = 0;
308 printf(" - "); 1173 }
1174
1175 /* dump all the good stuff */
1176 for (i = 0; out_format[i]; ++i) {
1177 const char *out;
1178 const char *tmp;
1179 static char ubuf[sizeof(unsigned long)*2];
1180 if (!IS_MODIFIER(out_format[i])) {
1181 xchrcat(&out_buffer, out_format[i], &out_len);
1182 continue;
1183 }
1184
1185 out = NULL;
1186 be_wewy_wewy_quiet = (out_format[i] == '#');
1187 be_semi_verbose = (out_format[i] == '+');
1188 switch (out_format[++i]) {
1189 case '+':
1190 case '%':
1191 case '#':
1192 xchrcat(&out_buffer, out_format[i], &out_len); break;
1193 case 'F':
1194 found_file = 1;
1195 if (be_wewy_wewy_quiet) break;
1196 xstrcat(&out_buffer, elf->filename, &out_len);
1197 break;
1198 case 'p':
1199 found_file = 1;
1200 if (be_wewy_wewy_quiet) break;
1201 tmp = elf->filename;
1202 if (search_path) {
1203 ssize_t len_search = strlen(search_path);
1204 ssize_t len_file = strlen(elf->filename);
1205 if (!strncmp(elf->filename, search_path, len_search) && \
1206 len_file > len_search)
1207 tmp += len_search;
1208 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
309 } 1209 }
1210 xstrcat(&out_buffer, tmp, &out_len);
1211 break;
1212 case 'f':
1213 found_file = 1;
1214 if (be_wewy_wewy_quiet) break;
1215 tmp = strrchr(elf->filename, '/');
1216 tmp = (tmp == NULL ? elf->filename : tmp+1);
1217 xstrcat(&out_buffer, tmp, &out_len);
1218 break;
1219 case 'o': out = get_elfetype(elf); break;
1220 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1221 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1222 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1223 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1224 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1225 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1226 case 'D': out = get_endian(elf); break;
1227 case 'O': out = strfileperms(elf->filename); break;
1228 case 'n':
1229 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1230 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1231 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1232 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1233 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1234 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1235 case 'a': out = get_elfemtype(elf); break;
1236 case 'I': out = get_elfosabi(elf); break;
1237 case 'Y': out = get_elf_eabi(elf); break;
1238 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1239 default: warnf("'%c' has no scan code?", out_format[i]);
310 } 1240 }
1241 if (out) {
1242 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1243 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1244 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1245 else
1246 xstrcat(&out_buffer, out, &out_len);
1247 }
1248 }
311 1249
312 if (!be_quiet || found_pax || found_stack || found_textrel || \ 1250#define FOUND_SOMETHING() \
313 found_rpath || found_needed || found_sym) 1251 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
314 printf("%s\n", filename); 1252 found_rpath || found_needed || found_interp || found_bind || \
1253 found_soname || found_sym || found_lib || found_textrels || found_section )
315 1254
1255 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1256 xchrcat(&out_buffer, ' ', &out_len);
1257 xstrcat(&out_buffer, elf->filename, &out_len);
1258 }
1259 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1260 puts(out_buffer);
1261 fflush(stdout);
1262 }
1263
1264 return 0;
1265}
1266
1267/* scan a single elf */
1268static int scanelf_elf(const char *filename, int fd, size_t len)
1269{
1270 int ret = 1;
1271 elfobj *elf;
1272
1273 /* verify this is real ELF */
1274 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1275 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1276 return ret;
1277 }
1278 switch (match_bits) {
1279 case 32:
1280 if (elf->elf_class != ELFCLASS32)
1281 goto label_done;
1282 break;
1283 case 64:
1284 if (elf->elf_class != ELFCLASS64)
1285 goto label_done;
1286 break;
1287 default: break;
1288 }
1289 if (strlen(match_etypes)) {
1290 char sbuf[126];
1291 strncpy(sbuf, match_etypes, sizeof(sbuf));
1292 if (strchr(match_etypes, ',') != NULL) {
1293 char *p;
1294 while ((p = strrchr(sbuf, ',')) != NULL) {
1295 *p = 0;
1296 if (etype_lookup(p+1) == get_etype(elf))
1297 goto label_ret;
1298 }
1299 }
1300 if (etype_lookup(sbuf) != get_etype(elf))
1301 goto label_done;
1302 }
1303
1304label_ret:
1305 ret = scanelf_elfobj(elf);
1306
1307label_done:
316 unreadelf(elf); 1308 unreadelf(elf);
1309 return ret;
1310}
1311
1312/* scan an archive of elfs */
1313static int scanelf_archive(const char *filename, int fd, size_t len)
1314{
1315 archive_handle *ar;
1316 archive_member *m;
1317 char *ar_buffer;
1318 elfobj *elf;
1319
1320 ar = ar_open_fd(filename, fd);
1321 if (ar == NULL)
1322 return 1;
1323
1324 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1325 while ((m=ar_next(ar)) != NULL) {
1326 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1327 if (elf) {
1328 scanelf_elfobj(elf);
1329 unreadelf(elf);
1330 }
1331 }
1332 munmap(ar_buffer, len);
1333
1334 return 0;
1335}
1336/* scan a file which may be an elf or an archive or some other magical beast */
1337static int scanelf_file(const char *filename, const struct stat *st_cache)
1338{
1339 const struct stat *st = st_cache;
1340 struct stat symlink_st;
1341 int fd;
1342
1343 /* always handle regular files and handle symlinked files if no -y */
1344 if (S_ISLNK(st->st_mode)) {
1345 if (!scan_symlink) return 1;
1346 stat(filename, &symlink_st);
1347 st = &symlink_st;
1348 }
1349
1350 if (!S_ISREG(st->st_mode)) {
1351 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1352 return 1;
1353 }
1354
1355 if (match_perms) {
1356 if ((st->st_mode | match_perms) != st->st_mode)
1357 return 1;
1358 }
1359 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1360 return 1;
1361
1362 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1363 /* if it isn't an ELF, maybe it's an .a archive */
1364 scanelf_archive(filename, fd, st->st_size);
1365
1366 close(fd);
1367 return 0;
317} 1368}
318 1369
319/* scan a directory for ET_EXEC files and print when we find one */ 1370/* scan a directory for ET_EXEC files and print when we find one */
320static void scanelf_dir(const char *path) 1371static int scanelf_dir(const char *path)
321{ 1372{
322 register DIR *dir; 1373 register DIR *dir;
323 register struct dirent *dentry; 1374 register struct dirent *dentry;
324 struct stat st_top, st; 1375 struct stat st_top, st;
325 char buf[_POSIX_PATH_MAX]; 1376 char buf[__PAX_UTILS_PATH_MAX];
326 size_t pathlen = 0, len = 0; 1377 size_t pathlen = 0, len = 0;
1378 int ret = 0;
327 1379
328 /* make sure path exists */ 1380 /* make sure path exists */
329 if (lstat(path, &st_top) == -1) 1381 if (lstat(path, &st_top) == -1) {
1382 if (be_verbose > 2) printf("%s: does not exist\n", path);
330 return; 1383 return 1;
1384 }
331 1385
332 /* ok, if it isn't a directory, assume we can open it */ 1386 /* ok, if it isn't a directory, assume we can open it */
333 if (!S_ISDIR(st_top.st_mode)) { 1387 if (!S_ISDIR(st_top.st_mode)) {
334 scanelf_file(path); 1388 return scanelf_file(path, &st_top);
335 return;
336 } 1389 }
337 1390
338 /* now scan the dir looking for fun stuff */ 1391 /* now scan the dir looking for fun stuff */
339 if ((dir = opendir(path)) == NULL) { 1392 if ((dir = opendir(path)) == NULL) {
340 warnf("could not opendir %s: %s", path, strerror(errno)); 1393 warnf("could not opendir %s: %s", path, strerror(errno));
341 return; 1394 return 1;
342 } 1395 }
343 if (be_verbose) printf("%s: scanning dir\n", path); 1396 if (be_verbose > 1) printf("%s: scanning dir\n", path);
344 1397
345 pathlen = strlen(path); 1398 pathlen = strlen(path);
346 while ((dentry = readdir(dir))) { 1399 while ((dentry = readdir(dir))) {
347 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1400 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
348 continue; 1401 continue;
349 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1402 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
350 if (len >= sizeof(buf)) { 1403 if (len >= sizeof(buf)) {
351 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf)); 1404 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1405 (unsigned long)len, (unsigned long)sizeof(buf));
352 continue; 1406 continue;
353 } 1407 }
354 sprintf(buf, "%s/%s", path, dentry->d_name); 1408 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
355 if (lstat(buf, &st) != -1) { 1409 if (lstat(buf, &st) != -1) {
356 if (S_ISREG(st.st_mode)) 1410 if (S_ISREG(st.st_mode))
357 scanelf_file(buf); 1411 ret = scanelf_file(buf, &st);
358 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1412 else if (dir_recurse && S_ISDIR(st.st_mode)) {
359 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1413 if (dir_crossmount || (st_top.st_dev == st.st_dev))
360 scanelf_dir(buf); 1414 ret = scanelf_dir(buf);
361 } 1415 }
362 } 1416 }
363 } 1417 }
364 closedir(dir); 1418 closedir(dir);
1419 return ret;
365} 1420}
1421
1422static int scanelf_from_file(const char *filename)
1423{
1424 FILE *fp = NULL;
1425 char *p;
1426 char path[__PAX_UTILS_PATH_MAX];
1427 int ret = 0;
1428
1429 if (strcmp(filename, "-") == 0)
1430 fp = stdin;
1431 else if ((fp = fopen(filename, "r")) == NULL)
1432 return 1;
1433
1434 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1435 if ((p = strchr(path, '\n')) != NULL)
1436 *p = 0;
1437 search_path = path;
1438 ret = scanelf_dir(path);
1439 }
1440 if (fp != stdin)
1441 fclose(fp);
1442 return ret;
1443}
1444
1445#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1446
1447static int load_ld_cache_config(int i, const char *fname)
1448{
1449 FILE *fp = NULL;
1450 char *p;
1451 char path[__PAX_UTILS_PATH_MAX];
1452
1453 if (i + 1 == ARRAY_SIZE(ldpaths))
1454 return i;
1455
1456 if ((fp = fopen(fname, "r")) == NULL)
1457 return i;
1458
1459 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1460 if ((p = strrchr(path, '\r')) != NULL)
1461 *p = 0;
1462 if ((p = strchr(path, '\n')) != NULL)
1463 *p = 0;
1464#ifdef __linux__
1465 /* recursive includes of the same file will make this segfault. */
1466 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1467 glob64_t gl;
1468 size_t x;
1469 char gpath[__PAX_UTILS_PATH_MAX];
1470
1471 memset(gpath, 0, sizeof(gpath));
1472
1473 if (path[8] != '/')
1474 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1475 else
1476 strncpy(gpath, &path[8], sizeof(gpath));
1477
1478 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1479 for (x = 0; x < gl.gl_pathc; ++x) {
1480 /* try to avoid direct loops */
1481 if (strcmp(gl.gl_pathv[x], fname) == 0)
1482 continue;
1483 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1484 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1485 globfree64(&gl);
1486 return i;
1487 }
1488 }
1489 globfree64 (&gl);
1490 continue;
1491 }
1492 }
1493#endif
1494 if (*path != '/')
1495 continue;
1496
1497 ldpaths[i++] = xstrdup(path);
1498
1499 if (i + 1 == ARRAY_SIZE(ldpaths))
1500 break;
1501 }
1502 ldpaths[i] = NULL;
1503
1504 fclose(fp);
1505 return i;
1506}
1507
1508#elif defined(__FreeBSD__) || (__DragonFly__)
1509
1510static int load_ld_cache_config(int i, const char *fname)
1511{
1512 FILE *fp = NULL;
1513 char *b = NULL, *p;
1514 struct elfhints_hdr hdr;
1515
1516 if (i + 1 == ARRAY_SIZE(ldpaths))
1517 return i;
1518
1519 if ((fp = fopen(fname, "r")) == NULL)
1520 return i;
1521
1522 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1523 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1524 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1525 {
1526 fclose(fp);
1527 return i;
1528 }
1529
1530 b = xmalloc(hdr.dirlistlen + 1);
1531 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1532 fclose(fp);
1533 free(b);
1534 return i;
1535 }
1536
1537 while ((p = strsep(&b, ":"))) {
1538 if (*p == '\0') continue;
1539 ldpaths[i++] = xstrdup(p);
1540
1541 if (i + 1 == ARRAY_SIZE(ldpaths))
1542 break;
1543 }
1544 ldpaths[i] = NULL;
1545
1546 free(b);
1547 fclose(fp);
1548 return i;
1549}
1550
1551#else
1552#ifdef __ELF__
1553#warning Cache config support not implemented for your target
1554#endif
1555static int load_ld_cache_config(int i, const char *fname)
1556{
1557 memset(ldpaths, 0x00, sizeof(ldpaths));
1558 return 0;
1559}
1560#endif
366 1561
367/* scan /etc/ld.so.conf for paths */ 1562/* scan /etc/ld.so.conf for paths */
368static void scanelf_ldpath() 1563static void scanelf_ldpath(void)
369{ 1564{
370 char scan_l, scan_ul, scan_ull; 1565 char scan_l, scan_ul, scan_ull;
371 char *path, *p; 1566 int i = 0;
372 FILE *fp;
373 1567
374 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1568 if (!ldpaths[0])
375 err("Unable to open ld.so.conf: %s", strerror(errno)); 1569 err("Unable to load any paths from ld.so.conf");
376 1570
377 scan_l = scan_ul = scan_ull = 0; 1571 scan_l = scan_ul = scan_ull = 0;
378 1572
379 if ((path = malloc(_POSIX_PATH_MAX)) == NULL) { 1573 while (ldpaths[i]) {
380 warn("Can not malloc() memory for ldpath scanning");
381 return;
382 }
383 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL)
384 if (*path == '/') {
385 if ((p = strrchr(path, '\r')) != NULL)
386 *p = 0;
387 if ((p = strrchr(path, '\n')) != NULL)
388 *p = 0;
389 if (!scan_l && !strcmp(path, "/lib")) scan_l = 1; 1574 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
390 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1; 1575 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
391 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1; 1576 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
392 scanelf_dir(path); 1577 scanelf_dir(ldpaths[i]);
1578 ++i;
393 } 1579 }
394 free(path);
395 fclose(fp);
396 1580
397 if (!scan_l) scanelf_dir("/lib"); 1581 if (!scan_l) scanelf_dir("/lib");
398 if (!scan_ul) scanelf_dir("/usr/lib"); 1582 if (!scan_ul) scanelf_dir("/usr/lib");
399 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1583 if (!scan_ull) scanelf_dir("/usr/local/lib");
400} 1584}
401 1585
402/* scan env PATH for paths */ 1586/* scan env PATH for paths */
403static void scanelf_envpath() 1587static void scanelf_envpath(void)
404{ 1588{
405 char *path, *p; 1589 char *path, *p;
406 1590
407 path = getenv("PATH"); 1591 path = getenv("PATH");
408 if (!path) 1592 if (!path)
409 err("PATH is not set in your env !"); 1593 err("PATH is not set in your env !");
410 1594 path = xstrdup(path);
411 if ((path = strdup(path)) == NULL)
412 err("strdup failed: %s", strerror(errno));
413 1595
414 while ((p = strrchr(path, ':')) != NULL) { 1596 while ((p = strrchr(path, ':')) != NULL) {
415 scanelf_dir(p + 1); 1597 scanelf_dir(p + 1);
416 *p = 0; 1598 *p = 0;
417 } 1599 }
418 1600
419 free(path); 1601 free(path);
420} 1602}
421 1603
422 1604/* usage / invocation handling functions */ /* Free Flags: c d j u w C G H J K P Q U W */
423 1605#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZBhV"
424/* usage / invocation handling functions */
425#define PARSE_FLAGS "plRmxetrns:aqvo:BhV"
426#define a_argument required_argument 1606#define a_argument required_argument
427static struct option const long_opts[] = { 1607static struct option const long_opts[] = {
428 {"path", no_argument, NULL, 'p'}, 1608 {"path", no_argument, NULL, 'p'},
429 {"ldpath", no_argument, NULL, 'l'}, 1609 {"ldpath", no_argument, NULL, 'l'},
430 {"recursive", no_argument, NULL, 'R'}, 1610 {"recursive", no_argument, NULL, 'R'},
431 {"mount", no_argument, NULL, 'm'}, 1611 {"mount", no_argument, NULL, 'm'},
1612 {"symlink", no_argument, NULL, 'y'},
1613 {"archives", no_argument, NULL, 'A'},
1614 {"ldcache", no_argument, NULL, 'L'},
1615 {"fix", no_argument, NULL, 'X'},
1616 {"setpax", a_argument, NULL, 'z'},
432 {"pax", no_argument, NULL, 'x'}, 1617 {"pax", no_argument, NULL, 'x'},
433 {"header", no_argument, NULL, 'e'}, 1618 {"header", no_argument, NULL, 'e'},
434 {"textrel", no_argument, NULL, 't'}, 1619 {"textrel", no_argument, NULL, 't'},
435 {"rpath", no_argument, NULL, 'r'}, 1620 {"rpath", no_argument, NULL, 'r'},
436 {"needed", no_argument, NULL, 'n'}, 1621 {"needed", no_argument, NULL, 'n'},
1622 {"interp", no_argument, NULL, 'i'},
1623 {"bind", no_argument, NULL, 'b'},
1624 {"soname", no_argument, NULL, 'S'},
437 {"symbol", a_argument, NULL, 's'}, 1625 {"symbol", a_argument, NULL, 's'},
1626 {"section", a_argument, NULL, 'k'},
1627 {"lib", a_argument, NULL, 'N'},
1628 {"gmatch", no_argument, NULL, 'g'},
1629 {"textrels", no_argument, NULL, 'T'},
1630 {"etype", a_argument, NULL, 'E'},
1631 {"bits", a_argument, NULL, 'M'},
1632 {"endian", no_argument, NULL, 'D'},
1633 {"osabi", no_argument, NULL, 'I'},
1634 {"eabi", no_argument, NULL, 'Y'},
1635 {"perms", a_argument, NULL, 'O'},
1636 {"size", no_argument, NULL, 'Z'},
438 {"all", no_argument, NULL, 'a'}, 1637 {"all", no_argument, NULL, 'a'},
439 {"quiet", no_argument, NULL, 'q'}, 1638 {"quiet", no_argument, NULL, 'q'},
440 {"verbose", no_argument, NULL, 'v'}, 1639 {"verbose", no_argument, NULL, 'v'},
1640 {"format", a_argument, NULL, 'F'},
1641 {"from", a_argument, NULL, 'f'},
441 {"file", a_argument, NULL, 'o'}, 1642 {"file", a_argument, NULL, 'o'},
442 {"nobanner", no_argument, NULL, 'B'}, 1643 {"nobanner", no_argument, NULL, 'B'},
443 {"help", no_argument, NULL, 'h'}, 1644 {"help", no_argument, NULL, 'h'},
444 {"version", no_argument, NULL, 'V'}, 1645 {"version", no_argument, NULL, 'V'},
445 {NULL, no_argument, NULL, 0x0} 1646 {NULL, no_argument, NULL, 0x0}
446}; 1647};
1648
447static char *opts_help[] = { 1649static const char *opts_help[] = {
448 "Scan all directories in PATH environment", 1650 "Scan all directories in PATH environment",
449 "Scan all directories in /etc/ld.so.conf", 1651 "Scan all directories in /etc/ld.so.conf",
450 "Scan directories recursively", 1652 "Scan directories recursively",
451 "Don't recursively cross mount points\n", 1653 "Don't recursively cross mount points",
1654 "Don't scan symlinks",
1655 "Scan archives (.a files)",
1656 "Utilize ld.so.cache information (use with -r/-n)",
1657 "Try and 'fix' bad things (use with -r/-e)",
1658 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
452 "Print PaX markings", 1659 "Print PaX markings",
453 "Print GNU_STACK markings", 1660 "Print GNU_STACK/PT_LOAD markings",
454 "Print TEXTREL information", 1661 "Print TEXTREL information",
455 "Print RPATH information", 1662 "Print RPATH information",
456 "Print NEEDED information", 1663 "Print NEEDED information",
1664 "Print INTERP information",
1665 "Print BIND information",
1666 "Print SONAME information",
457 "Find a specified symbol", 1667 "Find a specified symbol",
1668 "Find a specified section",
1669 "Find a specified library",
1670 "Use strncmp to match libraries. (use with -N)",
1671 "Locate cause of TEXTREL",
1672 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1673 "Print only ELF files matching numeric bits",
1674 "Print Endianness",
1675 "Print OSABI",
1676 "Print EABI (EM_ARM Only)",
1677 "Print only ELF files matching octal permissions",
1678 "Print ELF file size",
458 "Print all scanned info (-x -e -t -r)\n", 1679 "Print all scanned info (-x -e -t -r -b)\n",
459 "Only output 'bad' things", 1680 "Only output 'bad' things",
460 "Be verbose (can be specified more than once)", 1681 "Be verbose (can be specified more than once)",
1682 "Use specified format for output",
1683 "Read input stream from a filename",
461 "Write output stream to a filename", 1684 "Write output stream to a filename",
462 "Don't display the header", 1685 "Don't display the header",
463 "Print this help and exit", 1686 "Print this help and exit",
464 "Print version and exit", 1687 "Print version and exit",
465 NULL 1688 NULL
466}; 1689};
467 1690
468/* display usage and exit */ 1691/* display usage and exit */
469static void usage(int status) 1692static void usage(int status)
470{ 1693{
471 int i; 1694 unsigned long i;
472 printf(" Scan ELF binaries for stuff\n" 1695 printf("* Scan ELF binaries for stuff\n\n"
473 "Usage: %s [options] <dir1> [dir2 dirN ...]\n\n", argv0); 1696 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
474 printf("Options:\n"); 1697 printf("Options: -[%s]\n", PARSE_FLAGS);
475 for (i = 0; long_opts[i].name; ++i) 1698 for (i = 0; long_opts[i].name; ++i)
476 if (long_opts[i].has_arg == no_argument) 1699 if (long_opts[i].has_arg == no_argument)
477 printf(" -%c, --%-13s %s\n", long_opts[i].val, 1700 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
478 long_opts[i].name, opts_help[i]); 1701 long_opts[i].name, opts_help[i]);
479 else 1702 else
480 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val, 1703 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
481 long_opts[i].name, opts_help[i]); 1704 long_opts[i].name, opts_help[i]);
1705
1706 puts("\nFor more information, see the scanelf(1) manpage");
482 exit(status); 1707 exit(status);
483} 1708}
484 1709
485/* parse command line arguments and preform needed actions */ 1710/* parse command line arguments and preform needed actions */
1711#define do_pax_state(option, flag) \
1712 if (islower(option)) { \
1713 flags &= ~PF_##flag; \
1714 flags |= PF_NO##flag; \
1715 } else { \
1716 flags &= ~PF_NO##flag; \
1717 flags |= PF_##flag; \
1718 }
486static void parseargs(int argc, char *argv[]) 1719static int parseargs(int argc, char *argv[])
487{ 1720{
488 int flag; 1721 int i;
1722 const char *from_file = NULL;
1723 int ret = 0;
489 1724
490 opterr = 0; 1725 opterr = 0;
491 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1726 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
492 switch (flag) { 1727 switch (i) {
493 1728
494 case 'V': /* version info */ 1729 case 'V':
495 printf("%s compiled %s\n%s\n" 1730 printf("pax-utils-%s: %s compiled %s\n%s\n"
496 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 1731 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
497 __FILE__, __DATE__, rcsid, argv0); 1732 VERSION, __FILE__, __DATE__, rcsid, argv0);
498 exit(EXIT_SUCCESS); 1733 exit(EXIT_SUCCESS);
499 break; 1734 break;
500 case 'h': usage(EXIT_SUCCESS); break; 1735 case 'h': usage(EXIT_SUCCESS); break;
501 1736 case 'f':
1737 if (from_file) warn("You prob don't want to specify -f twice");
1738 from_file = optarg;
1739 break;
1740 case 'E':
1741 strncpy(match_etypes, optarg, sizeof(match_etypes));
1742 break;
1743 case 'M':
1744 match_bits = atoi(optarg);
1745 if (match_bits == 0) {
1746 if (strcmp(optarg, "ELFCLASS32") == 0)
1747 match_bits = 32;
1748 if (strcmp(optarg, "ELFCLASS64") == 0)
1749 match_bits = 64;
1750 }
1751 break;
1752 case 'O':
1753 if (sscanf(optarg, "%o", &match_perms) == -1)
1754 match_bits = 0;
1755 break;
502 case 'o': { 1756 case 'o': {
503 FILE *fp = NULL;
504 fp = freopen(optarg, "w", stdout); 1757 if (freopen(optarg, "w", stdout) == NULL)
505 if (fp == NULL)
506 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1758 err("Could not open output stream '%s': %s", optarg, strerror(errno));
507 stdout = fp; 1759 break;
1760 }
1761 case 'k':
1762 if (find_section) warn("You prob don't want to specify -k twice");
1763 find_section = optarg;
1764 break;
1765 case 's': {
1766 if (find_sym) warn("You prob don't want to specify -s twice");
1767 find_sym = optarg;
1768 break;
1769 }
1770 case 'N': {
1771 if (find_lib) warn("You prob don't want to specify -N twice");
1772 find_lib = optarg;
1773 break;
1774 }
1775
1776 case 'F': {
1777 if (out_format) warn("You prob don't want to specify -F twice");
1778 out_format = optarg;
1779 break;
1780 }
1781 case 'z': {
1782 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1783 size_t x;
1784
1785 for (x = 0; x < strlen(optarg); x++) {
1786 switch (optarg[x]) {
1787 case 'p':
1788 case 'P':
1789 do_pax_state(optarg[x], PAGEEXEC);
508 break; 1790 break;
1791 case 's':
1792 case 'S':
1793 do_pax_state(optarg[x], SEGMEXEC);
1794 break;
1795 case 'm':
1796 case 'M':
1797 do_pax_state(optarg[x], MPROTECT);
1798 break;
1799 case 'e':
1800 case 'E':
1801 do_pax_state(optarg[x], EMUTRAMP);
1802 break;
1803 case 'r':
1804 case 'R':
1805 do_pax_state(optarg[x], RANDMMAP);
1806 break;
1807 case 'x':
1808 case 'X':
1809 do_pax_state(optarg[x], RANDEXEC);
1810 break;
1811 default:
1812 break;
1813 }
509 } 1814 }
510 1815 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
511 case 's': find_sym = strdup(optarg); break; 1816 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
512 1817 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1818 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1819 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1820 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1821 setpax = flags;
1822 break;
1823 }
1824 case 'Z': show_size = 1; break;
1825 case 'g': g_match = 1; break;
1826 case 'L': use_ldcache = 1; break;
1827 case 'y': scan_symlink = 0; break;
1828 case 'A': scan_archives = 1; break;
513 case 'B': show_banner = 0; break; 1829 case 'B': show_banner = 0; break;
514 case 'l': scan_ldpath = 1; break; 1830 case 'l': scan_ldpath = 1; break;
515 case 'p': scan_envpath = 1; break; 1831 case 'p': scan_envpath = 1; break;
516 case 'R': dir_recurse = 1; break; 1832 case 'R': dir_recurse = 1; break;
517 case 'm': dir_crossmount = 0; break; 1833 case 'm': dir_crossmount = 0; break;
1834 case 'X': ++fix_elf; break;
518 case 'x': show_pax = 1; break; 1835 case 'x': show_pax = 1; break;
519 case 'e': show_stack = 1; break; 1836 case 'e': show_phdr = 1; break;
520 case 't': show_textrel = 1; break; 1837 case 't': show_textrel = 1; break;
521 case 'r': show_rpath = 1; break; 1838 case 'r': show_rpath = 1; break;
522 case 'n': show_needed = 1; break; 1839 case 'n': show_needed = 1; break;
1840 case 'i': show_interp = 1; break;
1841 case 'b': show_bind = 1; break;
1842 case 'S': show_soname = 1; break;
1843 case 'T': show_textrels = 1; break;
523 case 'q': be_quiet = 1; break; 1844 case 'q': be_quiet = 1; break;
524 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1845 case 'v': be_verbose = (be_verbose % 20) + 1; break;
525 case 'a': show_pax = show_stack = show_textrel = show_needed = show_rpath = 1; break; 1846 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
526 1847 case 'D': show_endian = 1; break;
1848 case 'I': show_osabi = 1; break;
1849 case 'Y': show_eabi = 1; break;
527 case ':': 1850 case ':':
528 warn("Option missing parameter"); 1851 err("Option '%c' is missing parameter", optopt);
529 usage(EXIT_FAILURE);
530 break;
531 case '?': 1852 case '?':
532 warn("Unknown option"); 1853 err("Unknown option '%c' or argument missing", optopt);
533 usage(EXIT_FAILURE);
534 break;
535 default: 1854 default:
536 err("Unhandled option '%c'", flag); 1855 err("Unhandled option '%c'; please report this", i);
537 break; 1856 }
1857 }
1858 if (show_textrels && be_verbose) {
1859 if (which("objdump") != NULL)
1860 has_objdump = 1;
1861 }
1862 /* let the format option override all other options */
1863 if (out_format) {
1864 show_pax = show_phdr = show_textrel = show_rpath = \
1865 show_needed = show_interp = show_bind = show_soname = \
1866 show_textrels = show_perms = show_endian = show_size = \
1867 show_osabi = show_eabi = 0;
1868 for (i = 0; out_format[i]; ++i) {
1869 if (!IS_MODIFIER(out_format[i])) continue;
1870
1871 switch (out_format[++i]) {
1872 case '+': break;
1873 case '%': break;
1874 case '#': break;
1875 case 'F': break;
1876 case 'p': break;
1877 case 'f': break;
1878 case 'k': break;
1879 case 's': break;
1880 case 'N': break;
1881 case 'o': break;
1882 case 'a': break;
1883 case 'M': break;
1884 case 'Z': show_size = 1; break;
1885 case 'D': show_endian = 1; break;
1886 case 'I': show_osabi = 1; break;
1887 case 'Y': show_eabi = 1; break;
1888 case 'O': show_perms = 1; break;
1889 case 'x': show_pax = 1; break;
1890 case 'e': show_phdr = 1; break;
1891 case 't': show_textrel = 1; break;
1892 case 'r': show_rpath = 1; break;
1893 case 'n': show_needed = 1; break;
1894 case 'i': show_interp = 1; break;
1895 case 'b': show_bind = 1; break;
1896 case 'S': show_soname = 1; break;
1897 case 'T': show_textrels = 1; break;
1898 default:
1899 err("Invalid format specifier '%c' (byte %i)",
1900 out_format[i], i+1);
538 } 1901 }
539 } 1902 }
540 1903
541 if (be_quiet && be_verbose) 1904 /* construct our default format */
542 err("You can be quiet or you can be verbose, not both, stupid"); 1905 } else {
1906 size_t fmt_len = 30;
1907 out_format = xmalloc(sizeof(char) * fmt_len);
1908 *out_format = '\0';
1909 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1910 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1911 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
1912 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
1913 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
1914 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
1915 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1916 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1917 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1918 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1919 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1920 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1921 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1922 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1923 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1924 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1925 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1926 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1927 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1928 }
1929 if (be_verbose > 2) printf("Format: %s\n", out_format);
543 1930
1931 /* now lets actually do the scanning */
1932 if (scan_ldpath || use_ldcache)
1933 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
544 if (scan_ldpath) scanelf_ldpath(); 1934 if (scan_ldpath) scanelf_ldpath();
545 if (scan_envpath) scanelf_envpath(); 1935 if (scan_envpath) scanelf_envpath();
1936 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1937 from_file = "-";
1938 if (from_file) {
1939 scanelf_from_file(from_file);
1940 from_file = *argv;
1941 }
546 if (optind == argc && !scan_ldpath && !scan_envpath) 1942 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
547 err("Nothing to scan !?"); 1943 err("Nothing to scan !?");
548 while (optind < argc) 1944 while (optind < argc) {
549 scanelf_dir(argv[optind++]); 1945 search_path = argv[optind++];
1946 ret = scanelf_dir(search_path);
1947 }
550 1948
551 if (find_sym) free(find_sym); 1949 /* clean up */
552} 1950 for (i = 0; ldpaths[i]; ++i)
1951 free(ldpaths[i]);
553 1952
1953 if (ldcache != 0)
1954 munmap(ldcache, ldcache_size);
1955 return ret;
1956}
554 1957
1958static char **get_split_env(const char *envvar)
1959{
1960 const char *delims = " \t\n";
1961 char **envvals = NULL;
1962 char *env, *s;
1963 int nentry;
1964
1965 if ((env = getenv(envvar)) == NULL)
1966 return NULL;
1967
1968 env = xstrdup(env);
1969 if (env == NULL)
1970 return NULL;
1971
1972 s = strtok(env, delims);
1973 if (s == NULL) {
1974 free(env);
1975 return NULL;
1976 }
1977
1978 nentry = 0;
1979 while (s != NULL) {
1980 ++nentry;
1981 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1982 envvals[nentry-1] = s;
1983 s = strtok(NULL, delims);
1984 }
1985 envvals[nentry] = NULL;
1986
1987 /* don't want to free(env) as it contains the memory that backs
1988 * the envvals array of strings */
1989 return envvals;
1990}
1991
1992static void parseenv(void)
1993{
1994 qa_textrels = get_split_env("QA_TEXTRELS");
1995 qa_execstack = get_split_env("QA_EXECSTACK");
1996 qa_wx_load = get_split_env("QA_WX_LOAD");
1997}
1998
1999#ifdef __PAX_UTILS_CLEANUP
2000static void cleanup(void)
2001{
2002 free(out_format);
2003 free(qa_textrels);
2004 free(qa_execstack);
2005 free(qa_wx_load);
2006}
2007#endif
555 2008
556int main(int argc, char *argv[]) 2009int main(int argc, char *argv[])
557{ 2010{
2011 int ret;
558 if (argc < 2) 2012 if (argc < 2)
559 usage(EXIT_FAILURE); 2013 usage(EXIT_FAILURE);
2014 parseenv();
560 parseargs(argc, argv); 2015 ret = parseargs(argc, argv);
561 fclose(stdout); 2016 fclose(stdout);
562 return EXIT_SUCCESS; 2017#ifdef __PAX_UTILS_CLEANUP
2018 cleanup();
2019 warn("The calls to add/delete heap should be off:\n"
2020 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
2021 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2022#endif
2023 return ret;
563} 2024}
2025
2026/* Match filename against entries in matchlist, return TRUE
2027 * if the file is listed */
2028static int file_matches_list(const char *filename, char **matchlist)
2029{
2030 char **file;
2031 char *match;
2032 char buf[__PAX_UTILS_PATH_MAX];
2033
2034 if (matchlist == NULL)
2035 return 0;
2036
2037 for (file = matchlist; *file != NULL; file++) {
2038 if (search_path) {
2039 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2040 match = buf;
2041 } else {
2042 match = *file;
2043 }
2044 if (fnmatch(match, filename, 0) == 0)
2045 return 1;
2046 }
2047 return 0;
2048}

Legend:
Removed from v.1.32  
changed lines
  Added in v.1.209

  ViewVC Help
Powered by ViewVC 1.1.20