/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.44 Revision 1.173
1/* 1/*
2 * Copyright 2003 Ned Ludd <solar@gentoo.org>
3 * Copyright 1999-2005 Gentoo Foundation 2 * Copyright 2003-2006 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 1.44 2005/05/10 22:54:25 vapier Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.173 2007/01/18 00:26:34 vapier Exp $
6 * 5 *
7 ******************************************************************** 6 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org>
8 * This program is free software; you can redistribute it and/or 7 * Copyright 2004-2006 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" 10#include "paxinc.h"
37 11
38static const char *rcsid = "$Id: scanelf.c,v 1.44 2005/05/10 22:54:25 vapier Exp $"; 12static const char *rcsid = "$Id: scanelf.c,v 1.173 2007/01/18 00:26:34 vapier Exp $";
39#define argv0 "scanelf" 13#define argv0 "scanelf"
40 14
41 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
42 16
43/* prototypes */ 17/* prototypes */
44static 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);
45static void scanelf_dir(const char *path); 23static int scanelf_dir(const char *path);
46static void scanelf_ldpath(); 24static void scanelf_ldpath(void);
47static void scanelf_envpath(); 25static void scanelf_envpath(void);
48static void usage(int status); 26static void usage(int status);
27static char **get_split_env(const char *envvar);
28static void parseenv(void);
49static void parseargs(int argc, char *argv[]); 29static int parseargs(int argc, char *argv[]);
50static char *xstrdup(char *s); 30static char *xstrdup(const char *s);
51static void *xmalloc(size_t size); 31static void *xmalloc(size_t size);
32static void *xrealloc(void *ptr, size_t size);
52static void xstrcat(char **dst, const char *src, size_t *curr_len); 33static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
34#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
53static inline void xchrcat(char **dst, const char append, size_t *curr_len); 35static inline void xchrcat(char **dst, const char append, size_t *curr_len);
54static int xemptybuffer(const char *buff);
55 36
56/* variables to control behavior */ 37/* variables to control behavior */
38static char match_etypes[126] = "";
39static char *ldpaths[256];
57static char scan_ldpath = 0; 40static char scan_ldpath = 0;
58static char scan_envpath = 0; 41static char scan_envpath = 0;
59static char scan_symlink = 1; 42static char scan_symlink = 1;
43static char scan_archives = 0;
60static char dir_recurse = 0; 44static char dir_recurse = 0;
61static char dir_crossmount = 1; 45static char dir_crossmount = 1;
62static char show_pax = 0; 46static char show_pax = 0;
63static char show_stack = 0; 47static char show_phdr = 0;
64static char show_textrel = 0; 48static char show_textrel = 0;
65static char show_rpath = 0; 49static char show_rpath = 0;
66static char show_needed = 0; 50static char show_needed = 0;
67static char show_interp = 0; 51static char show_interp = 0;
52static char show_bind = 0;
53static char show_soname = 0;
54static char show_textrels = 0;
68static char show_banner = 1; 55static char show_banner = 1;
69static char be_quiet = 0; 56static char be_quiet = 0;
70static char be_verbose = 0; 57static char be_verbose = 0;
58static char be_wewy_wewy_quiet = 0;
59static char be_semi_verbose = 0;
71static char *find_sym = NULL, *versioned_symname = NULL; 60static char *find_sym = NULL, *versioned_symname = NULL;
61static char *find_lib = NULL;
62static char *find_section = NULL;
72static char *out_format = NULL; 63static char *out_format = NULL;
64static char *search_path = NULL;
65static char fix_elf = 0;
66static char gmatch = 0;
67static char use_ldcache = 0;
73 68
69static char **qa_textrels = NULL;
70static char **qa_execstack = NULL;
71static char **qa_wx_load = NULL;
74 72
73int match_bits = 0;
74caddr_t ldcache = 0;
75size_t ldcache_size = 0;
76unsigned long setpax = 0UL;
77
78int has_objdump = 0;
79
80static char *which(const char *fname)
81{
82 static char fullpath[BUFSIZ];
83 char *path, *p;
84
85 path = getenv("PATH");
86 if (!path)
87 return NULL;
88
89 path = xstrdup(path);
90 while ((p = strrchr(path, ':')) != NULL) {
91 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
92 *p = 0;
93 if (access(fullpath, R_OK) != (-1)) {
94 free(path);
95 return (char *) fullpath;
96 }
97 }
98 free(path);
99 return NULL;
100}
75 101
76/* sub-funcs for scanelf_file() */ 102/* sub-funcs for scanelf_file() */
103static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
104{
105 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
106#define GET_SYMTABS(B) \
107 if (elf->elf_class == ELFCLASS ## B) { \
108 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
109 /* debug sections */ \
110 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
111 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
112 /* runtime sections */ \
113 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
114 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
115 if (symtab && dynsym) { \
116 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
117 } else { \
118 *sym = (void*)(symtab ? symtab : dynsym); \
119 } \
120 if (strtab && dynstr) { \
121 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
122 } else { \
123 *tab = (void*)(strtab ? strtab : dynstr); \
124 } \
125 }
126 GET_SYMTABS(32)
127 GET_SYMTABS(64)
128}
129
77static char *scanelf_file_pax(elfobj *elf, char *found_pax) 130static char *scanelf_file_pax(elfobj *elf, char *found_pax)
78{ 131{
79 static char *paxflags; 132 static char ret[7];
133 unsigned long i, shown;
80 134
81 if (!show_pax) return NULL; 135 if (!show_pax) return NULL;
82 136
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[8];
94 char *found;
95 unsigned long i, off, shown;
96
97 if (!show_stack) return NULL;
98
99 shown = 0; 137 shown = 0;
100 strcpy(ret, "--- ---"); 138 memset(&ret, 0, sizeof(ret));
101 139
102 if (elf->phdr) { 140 if (elf->phdr) {
103#define SHOW_STACK(B) \ 141#define SHOW_PAX(B) \
104 if (elf->elf_class == ELFCLASS ## B) { \ 142 if (elf->elf_class == ELFCLASS ## B) { \
105 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 143 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
106 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 144 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
107 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 145 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
108 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 146 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
109 found = found_stack; \
110 off = 0; \
111 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
112 found = found_relro; \
113 off = 3; \
114 } else \
115 continue; \ 147 continue; \
116 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ 148 if (fix_elf && setpax) { \
149 /* set the paxctl flags */ \
150 ESET(phdr[i].p_flags, setpax); \
151 } \
152 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
117 continue; \ 153 continue; \
118 memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \ 154 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
119 *found = 1; \ 155 *found_pax = 1; \
120 ++shown; \ 156 ++shown; \
157 break; \
121 } \ 158 } \
122 } 159 }
123 SHOW_STACK(32) 160 SHOW_PAX(32)
124 SHOW_STACK(64) 161 SHOW_PAX(64)
162 }
163
164
165 if (fix_elf && setpax) {
166 /* set the chpax settings */
167 if (elf->elf_class == ELFCLASS32) {
168 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
169 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
170 } else {
171 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
172 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
125 } 173 }
174 }
126 175
127 if (be_quiet && !shown) 176 /* fall back to EI_PAX if no PT_PAX was found */
177 if (!*ret) {
178 static char *paxflags;
179 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
180 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
181 *found_pax = 1;
182 return (be_wewy_wewy_quiet ? NULL : paxflags);
183 }
184 strncpy(ret, paxflags, sizeof(ret));
185 }
186
187 if (be_wewy_wewy_quiet || (be_quiet && !shown))
128 return NULL; 188 return NULL;
129 else 189 else
130 return ret; 190 return ret;
131} 191}
192
193static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
194{
195 static char ret[12];
196 char *found;
197 unsigned long i, shown, multi_stack, multi_relro, multi_load;
198 int max_pt_load;
199
200 if (!show_phdr) return NULL;
201
202 memcpy(ret, "--- --- ---\0", 12);
203
204 shown = 0;
205 multi_stack = multi_relro = multi_load = 0;
206 max_pt_load = elf_max_pt_load(elf);
207
208#define NOTE_GNU_STACK ".note.GNU-stack"
209#define SHOW_PHDR(B) \
210 if (elf->elf_class == ELFCLASS ## B) { \
211 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
212 Elf ## B ## _Off offset; \
213 uint32_t flags, check_flags; \
214 if (elf->phdr != NULL) { \
215 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
216 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
217 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
218 if (multi_stack++) \
219 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
220 if (file_matches_list(elf->filename, qa_execstack)) \
221 continue; \
222 found = found_phdr; \
223 offset = 0; \
224 check_flags = PF_X; \
225 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
226 if (multi_relro++) \
227 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
228 found = found_relro; \
229 offset = 4; \
230 check_flags = PF_X; \
231 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
232 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
233 if (multi_load++ > max_pt_load) \
234 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
235 if (file_matches_list(elf->filename, qa_wx_load)) \
236 continue; \
237 found = found_load; \
238 offset = 8; \
239 check_flags = PF_W|PF_X; \
240 } else \
241 continue; \
242 flags = EGET(phdr[i].p_flags); \
243 if (be_quiet && ((flags & check_flags) != check_flags)) \
244 continue; \
245 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
246 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
247 ret[3] = ret[7] = '!'; \
248 flags = EGET(phdr[i].p_flags); \
249 } \
250 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
251 *found = 1; \
252 ++shown; \
253 } \
254 } else if (elf->shdr != NULL) { \
255 /* no program headers which means this is prob an object file */ \
256 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
257 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
258 char *str; \
259 if ((void*)strtbl > (void*)elf->data_end) \
260 goto skip_this_shdr##B; \
261 check_flags = SHF_WRITE|SHF_EXECINSTR; \
262 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
263 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
264 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
265 str = elf->data + offset; \
266 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
267 if (!strcmp(str, NOTE_GNU_STACK)) { \
268 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
269 flags = EGET(shdr[i].sh_flags); \
270 if (be_quiet && ((flags & check_flags) != check_flags)) \
271 continue; \
272 ++*found_phdr; \
273 shown = 1; \
274 if (flags & SHF_WRITE) ret[0] = 'W'; \
275 if (flags & SHF_ALLOC) ret[1] = 'A'; \
276 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
277 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
278 break; \
279 } \
280 } \
281 skip_this_shdr##B: \
282 if (!multi_stack) { \
283 if (file_matches_list(elf->filename, qa_execstack)) \
284 return NULL; \
285 *found_phdr = 1; \
286 shown = 1; \
287 memcpy(ret, "!WX", 3); \
288 } \
289 } \
290 }
291 SHOW_PHDR(32)
292 SHOW_PHDR(64)
293
294 if (be_wewy_wewy_quiet || (be_quiet && !shown))
295 return NULL;
296 else
297 return ret;
298}
299
132static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 300static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
133{ 301{
134 static char *ret = "TEXTREL"; 302 static const char *ret = "TEXTREL";
135 unsigned long i; 303 unsigned long i;
136 304
137 if (!show_textrel) return NULL; 305 if (!show_textrel && !show_textrels) return NULL;
306
307 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
138 308
139 if (elf->phdr) { 309 if (elf->phdr) {
140#define SHOW_TEXTREL(B) \ 310#define SHOW_TEXTREL(B) \
141 if (elf->elf_class == ELFCLASS ## B) { \ 311 if (elf->elf_class == ELFCLASS ## B) { \
142 Elf ## B ## _Dyn *dyn; \ 312 Elf ## B ## _Dyn *dyn; \
143 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 313 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
144 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 314 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
145 Elf ## B ## _Off offset; \ 315 Elf ## B ## _Off offset; \
146 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 316 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
147 if (phdr[i].p_type != PT_DYNAMIC) continue; \ 317 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
148 offset = EGET(phdr[i].p_offset); \ 318 offset = EGET(phdr[i].p_offset); \
149 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 319 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
150 dyn = DYN ## B (elf->data + offset); \ 320 dyn = DYN ## B (elf->data + offset); \
151 while (EGET(dyn->d_tag) != DT_NULL) { \ 321 while (EGET(dyn->d_tag) != DT_NULL) { \
152 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 322 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
153 *found_textrel = 1; \ 323 *found_textrel = 1; \
154 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 324 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
155 return ret; \ 325 return (be_wewy_wewy_quiet ? NULL : ret); \
156 } \ 326 } \
157 ++dyn; \ 327 ++dyn; \
158 } \ 328 } \
159 } } 329 } }
160 SHOW_TEXTREL(32) 330 SHOW_TEXTREL(32)
161 SHOW_TEXTREL(64) 331 SHOW_TEXTREL(64)
162 } 332 }
163 333
164 if (be_quiet) 334 if (be_quiet || be_wewy_wewy_quiet)
165 return NULL; 335 return NULL;
166 else 336 else
167 return " - "; 337 return " - ";
168} 338}
339static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
340{
341 unsigned long s, r, rmax;
342 void *symtab_void, *strtab_void, *text_void;
343
344 if (!show_textrels) return NULL;
345
346 /* don't search for TEXTREL's if the ELF doesn't have any */
347 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
348 if (!*found_textrel) return NULL;
349
350 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
351 text_void = elf_findsecbyname(elf, ".text");
352
353 if (symtab_void && strtab_void && text_void && elf->shdr) {
354#define SHOW_TEXTRELS(B) \
355 if (elf->elf_class == ELFCLASS ## B) { \
356 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
357 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
358 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
359 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
360 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
361 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
362 uint ## B ## _t memsz = EGET(text->sh_size); \
363 Elf ## B ## _Rel *rel; \
364 Elf ## B ## _Rela *rela; \
365 /* search the section headers for relocations */ \
366 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
367 uint32_t sh_type = EGET(shdr[s].sh_type); \
368 if (sh_type == SHT_REL) { \
369 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
370 rela = NULL; \
371 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
372 } else if (sh_type == SHT_RELA) { \
373 rel = NULL; \
374 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
375 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
376 } else \
377 continue; \
378 /* now see if any of the relocs are in the .text */ \
379 for (r = 0; r < rmax; ++r) { \
380 unsigned long sym_max; \
381 Elf ## B ## _Addr offset_tmp; \
382 Elf ## B ## _Sym *func; \
383 Elf ## B ## _Sym *sym; \
384 Elf ## B ## _Addr r_offset; \
385 uint ## B ## _t r_info; \
386 if (sh_type == SHT_REL) { \
387 r_offset = EGET(rel[r].r_offset); \
388 r_info = EGET(rel[r].r_info); \
389 } else { \
390 r_offset = EGET(rela[r].r_offset); \
391 r_info = EGET(rela[r].r_info); \
392 } \
393 /* make sure this relocation is inside of the .text */ \
394 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
395 if (be_verbose <= 2) continue; \
396 } else \
397 *found_textrels = 1; \
398 /* locate this relocation symbol name */ \
399 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
400 if ((void*)sym > (void*)elf->data_end) { \
401 warn("%s: corrupt ELF symbol", elf->filename); \
402 continue; \
403 } \
404 sym_max = ELF ## B ## _R_SYM(r_info); \
405 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
406 sym += sym_max; \
407 else \
408 sym = NULL; \
409 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
410 /* show the raw details about this reloc */ \
411 printf(" %s: ", elf->base_filename); \
412 if (sym && sym->st_name) \
413 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
414 else \
415 printf("(memory/data?)"); \
416 printf(" [0x%lX]", (unsigned long)r_offset); \
417 /* now try to find the closest symbol that this rel is probably in */ \
418 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
419 func = NULL; \
420 offset_tmp = 0; \
421 while (sym_max--) { \
422 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
423 func = sym; \
424 offset_tmp = EGET(sym->st_value); \
425 } \
426 ++sym; \
427 } \
428 printf(" in "); \
429 if (func && func->st_name) { \
430 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
431 if (r_offset > EGET(func->st_size)) \
432 printf("(optimized out: previous %s)", func_name); \
433 else \
434 printf("%s", func_name); \
435 } else \
436 printf("(optimized out)"); \
437 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
438 if (be_verbose && has_objdump) { \
439 char *sysbuf; \
440 size_t syslen; \
441 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"; \
442 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
443 sysbuf = xmalloc(syslen); \
444 if (sysbuf) { \
445 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
446 if (end_addr < r_offset) \
447 /* not uncommon when things are optimized out */ \
448 end_addr = r_offset + 0x100; \
449 snprintf(sysbuf, syslen, sysfmt, \
450 (unsigned long)offset_tmp, \
451 (unsigned long)end_addr, \
452 elf->filename, \
453 (unsigned long)r_offset); \
454 fflush(stdout); \
455 system(sysbuf); \
456 fflush(stdout); \
457 free(sysbuf); \
458 } \
459 } \
460 } \
461 } }
462 SHOW_TEXTRELS(32)
463 SHOW_TEXTRELS(64)
464 }
465 if (!*found_textrels)
466 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
467
468 return NULL;
469}
470
471static void rpath_security_checks(elfobj *, char *, const char *);
472static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
473{
474 struct stat st;
475 switch (*item) {
476 case '/': break;
477 case '.':
478 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
479 break;
480 case ':':
481 case '\0':
482 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
483 break;
484 case '$':
485 if (fstat(elf->fd, &st) != -1)
486 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
487 warnf("Security problem with %s='%s' in %s with mode set of %o",
488 dt_type, item, elf->filename, st.st_mode & 07777);
489 break;
490 default:
491 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
492 break;
493 }
494}
169static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 495static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
170{ 496{
171 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */
172 unsigned long i; 497 unsigned long i, s;
173 char *rpath, *runpath; 498 char *rpath, *runpath, **r;
174 void *strtbl_void; 499 void *strtbl_void;
175 500
176 if (!show_rpath) return; 501 if (!show_rpath) return;
177 502
178 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 503 strtbl_void = elf_findsecbyname(elf, ".dynstr");
184 Elf ## B ## _Dyn *dyn; \ 509 Elf ## B ## _Dyn *dyn; \
185 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 510 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
186 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 511 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
187 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 512 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
188 Elf ## B ## _Off offset; \ 513 Elf ## B ## _Off offset; \
514 Elf ## B ## _Xword word; \
515 /* Scan all the program headers */ \
189 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 516 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
517 /* Just scan dynamic headers */ \
190 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 518 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
191 offset = EGET(phdr[i].p_offset); \ 519 offset = EGET(phdr[i].p_offset); \
192 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 520 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
521 /* Just scan dynamic RPATH/RUNPATH headers */ \
193 dyn = DYN ## B (elf->data + offset); \ 522 dyn = DYN ## B (elf->data + offset); \
194 while (EGET(dyn->d_tag) != DT_NULL) { \ 523 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
195 if (EGET(dyn->d_tag) == DT_RPATH) { \ 524 if (word == DT_RPATH) { \
196 if (rpath) warn("ELF has multiple DT_RPATH's !?"); \ 525 r = &rpath; \
526 } else if (word == DT_RUNPATH) { \
527 r = &runpath; \
528 } else { \
529 ++dyn; \
530 continue; \
531 } \
532 /* Verify the memory is somewhat sane */ \
197 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 533 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
198 if (offset >= elf->len) continue; \ 534 if (offset < (Elf ## B ## _Off)elf->len) { \
535 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
199 rpath = (char*)(elf->data + offset); \ 536 *r = (char*)(elf->data + offset); \
537 /* cache the length in case we need to nuke this section later on */ \
538 if (fix_elf) \
539 offset = strlen(*r); \
540 /* If quiet, don't output paths in ld.so.conf */ \
541 if (be_quiet) { \
542 size_t len; \
543 char *start, *end; \
544 /* note that we only 'chop' off leading known paths. */ \
545 /* since *r is read-only memory, we can only move the ptr forward. */ \
546 start = *r; \
547 /* scan each path in : delimited list */ \
548 while (start) { \
549 rpath_security_checks(elf, start, get_elfdtype(word)); \
550 end = strchr(start, ':'); \
551 len = (end ? abs(end - start) : strlen(start)); \
552 if (use_ldcache) \
553 for (s = 0; ldpaths[s]; ++s) \
554 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
555 *r = end; \
556 /* corner case ... if RPATH reads "/usr/lib:", we want \
557 * to show ':' rather than '' */ \
558 if (end && end[1] != '\0') \
559 (*r)++; \
560 break; \
561 } \
562 if (!*r || !end) \
563 break; \
564 else \
565 start = start + len + 1; \
566 } \
567 } \
568 if (*r) { \
569 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
570 /* just nuke it */ \
571 nuke_it##B: \
572 memset(*r, 0x00, offset); \
573 *r = NULL; \
574 ESET(dyn->d_tag, DT_DEBUG); \
575 ESET(dyn->d_un.d_ptr, 0); \
576 } else if (fix_elf) { \
577 /* try to clean "bad" paths */ \
578 size_t len, tmpdir_len; \
579 char *start, *end; \
580 const char *tmpdir; \
581 start = *r; \
582 tmpdir = (getenv("TMPDIR") ? : "."); \
583 tmpdir_len = strlen(tmpdir); \
584 while (1) { \
585 end = strchr(start, ':'); \
586 if (start == end) { \
587 eat_this_path##B: \
588 len = strlen(end); \
589 memmove(start, end+1, len); \
590 start[len-1] = '\0'; \
591 end = start - 1; \
592 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
593 if (!end) { \
594 if (start == *r) \
595 goto nuke_it##B; \
596 *--start = '\0'; \
597 } else \
598 goto eat_this_path##B; \
599 } \
600 if (!end) \
601 break; \
602 start = end + 1; \
603 } \
604 if (**r == '\0') \
605 goto nuke_it##B; \
606 } \
607 if (*r) \
200 *found_rpath = 1; \ 608 *found_rpath = 1; \
201 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \ 609 } \
202 if (runpath) warn("ELF has multiple DT_RUNPATH's !?"); \
203 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
204 if (offset >= elf->len) continue; \
205 runpath = (char*)(elf->data + offset); \
206 *found_rpath = 1; \
207 } \ 610 } \
208 ++dyn; \ 611 ++dyn; \
209 } \ 612 } \
210 } } 613 } }
211 SHOW_RPATH(32) 614 SHOW_RPATH(32)
212 SHOW_RPATH(64) 615 SHOW_RPATH(64)
213 } 616 }
617
618 if (be_wewy_wewy_quiet) return;
214 619
215 if (rpath && runpath) { 620 if (rpath && runpath) {
216 if (!strcmp(rpath, runpath)) { 621 if (!strcmp(rpath, runpath)) {
217 xstrcat(ret, runpath, ret_len); 622 xstrcat(ret, runpath, ret_len);
218 } else { 623 } else {
226 } else if (rpath || runpath) 631 } else if (rpath || runpath)
227 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 632 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
228 else if (!be_quiet) 633 else if (!be_quiet)
229 xstrcat(ret, " - ", ret_len); 634 xstrcat(ret, " - ", ret_len);
230} 635}
636
637#define LDSO_CACHE_MAGIC "ld.so-"
638#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
639#define LDSO_CACHE_VER "1.7.0"
640#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
641#define FLAG_ANY -1
642#define FLAG_TYPE_MASK 0x00ff
643#define FLAG_LIBC4 0x0000
644#define FLAG_ELF 0x0001
645#define FLAG_ELF_LIBC5 0x0002
646#define FLAG_ELF_LIBC6 0x0003
647#define FLAG_REQUIRED_MASK 0xff00
648#define FLAG_SPARC_LIB64 0x0100
649#define FLAG_IA64_LIB64 0x0200
650#define FLAG_X8664_LIB64 0x0300
651#define FLAG_S390_LIB64 0x0400
652#define FLAG_POWERPC_LIB64 0x0500
653#define FLAG_MIPS64_LIBN32 0x0600
654#define FLAG_MIPS64_LIBN64 0x0700
655
656static char *lookup_cache_lib(elfobj *, char *);
657
658#if defined(__GLIBC__) || defined(__UCLIBC__)
659
660static char *lookup_cache_lib(elfobj *elf, char *fname)
661{
662 int fd = 0;
663 char *strs;
664 static char buf[__PAX_UTILS_PATH_MAX] = "";
665 const char *cachefile = "/etc/ld.so.cache";
666 struct stat st;
667
668 typedef struct {
669 char magic[LDSO_CACHE_MAGIC_LEN];
670 char version[LDSO_CACHE_VER_LEN];
671 int nlibs;
672 } header_t;
673 header_t *header;
674
675 typedef struct {
676 int flags;
677 int sooffset;
678 int liboffset;
679 } libentry_t;
680 libentry_t *libent;
681
682 if (fname == NULL)
683 return NULL;
684
685 if (ldcache == 0) {
686 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
687 return NULL;
688
689 /* cache these values so we only map/unmap the cache file once */
690 ldcache_size = st.st_size;
691 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
692
693 close(fd);
694
695 if (ldcache == (caddr_t)-1) {
696 ldcache = 0;
697 return NULL;
698 }
699
700 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
701 return NULL;
702 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
703 return NULL;
704 }
705
706 header = (header_t *) ldcache;
707 libent = (libentry_t *) (ldcache + sizeof(header_t));
708 strs = (char *) &libent[header->nlibs];
709
710 for (fd = 0; fd < header->nlibs; fd++) {
711 /* this should be more fine grained, but for now we assume that
712 * diff arches will not be cached together. and we ignore the
713 * the different multilib mips cases. */
714 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
715 continue;
716 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
717 continue;
718
719 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
720 continue;
721 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
722 }
723 return buf;
724}
725#elif defined(__NetBSD__)
726static char *lookup_cache_lib(elfobj *elf, char *fname)
727{
728 static char buf[__PAX_UTILS_PATH_MAX] = "";
729 static struct stat st;
730
731 char **ldpath;
732 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
733 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
734 continue; /* if the pathname is too long, or something went wrong, ignore */
735
736 if (stat(buf, &st) != 0)
737 continue; /* if the lib doesn't exist in *ldpath, look further */
738
739 /* NetBSD doesn't actually do sanity checks, it just loads the file
740 * and if that doesn't work, continues looking in other directories.
741 * This cannot easily be safely emulated, unfortunately. For now,
742 * just assume that if it exists, it's a valid library. */
743
744 return buf;
745 }
746
747 /* not found in any path */
748 return NULL;
749}
750#else
751#warning Cache support not implemented for your target
752static char *lookup_cache_lib(elfobj *elf, char *fname)
753{
754 return NULL;
755}
756#endif
757
231static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len) 758static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
232{ 759{
233 unsigned long i; 760 unsigned long i;
234 char *needed; 761 char *needed;
235 void *strtbl_void; 762 void *strtbl_void;
763 char *p;
236 764
237 if (!show_needed) return; 765 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
238 766
239 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 767 strtbl_void = elf_findsecbyname(elf, ".dynstr");
240 768
241 if (elf->phdr && strtbl_void) { 769 if (elf->phdr && strtbl_void) {
242#define SHOW_NEEDED(B) \ 770#define SHOW_NEEDED(B) \
252 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 780 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
253 dyn = DYN ## B (elf->data + offset); \ 781 dyn = DYN ## B (elf->data + offset); \
254 while (EGET(dyn->d_tag) != DT_NULL) { \ 782 while (EGET(dyn->d_tag) != DT_NULL) { \
255 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 783 if (EGET(dyn->d_tag) == DT_NEEDED) { \
256 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 784 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
257 if (offset >= elf->len) continue; \ 785 if (offset >= (Elf ## B ## _Off)elf->len) { \
786 ++dyn; \
787 continue; \
788 } \
258 needed = (char*)(elf->data + offset); \ 789 needed = (char*)(elf->data + offset); \
790 if (op == 0) { \
791 if (!be_wewy_wewy_quiet) { \
259 if (*found_needed) xchrcat(ret, ',', ret_len); \ 792 if (*found_needed) xchrcat(ret, ',', ret_len); \
793 if (use_ldcache) \
794 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
795 needed = p; \
260 xstrcat(ret, needed, ret_len); \ 796 xstrcat(ret, needed, ret_len); \
797 } \
261 *found_needed = 1; \ 798 *found_needed = 1; \
799 } else { \
800 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
801 *found_lib = 1; \
802 return (be_wewy_wewy_quiet ? NULL : needed); \
803 } \
804 } \
262 } \ 805 } \
263 ++dyn; \ 806 ++dyn; \
264 } \ 807 } \
265 } } 808 } }
266 SHOW_NEEDED(32) 809 SHOW_NEEDED(32)
267 SHOW_NEEDED(64) 810 SHOW_NEEDED(64)
811 if (op == 0 && !*found_needed && be_verbose)
812 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
268 } 813 }
814
815 return NULL;
269} 816}
270static char *scanelf_file_interp(elfobj *elf, char *found_interp) 817static char *scanelf_file_interp(elfobj *elf, char *found_interp)
271{ 818{
272 void *strtbl_void; 819 void *strtbl_void;
273 820
278 if (strtbl_void) { 825 if (strtbl_void) {
279#define SHOW_INTERP(B) \ 826#define SHOW_INTERP(B) \
280 if (elf->elf_class == ELFCLASS ## B) { \ 827 if (elf->elf_class == ELFCLASS ## B) { \
281 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 828 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
282 *found_interp = 1; \ 829 *found_interp = 1; \
283 return elf->data + EGET(strtbl->sh_offset); \ 830 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
284 } 831 }
285 SHOW_INTERP(32) 832 SHOW_INTERP(32)
286 SHOW_INTERP(64) 833 SHOW_INTERP(64)
287 } 834 }
288 return NULL; 835 return NULL;
289} 836}
290static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename) 837static char *scanelf_file_bind(elfobj *elf, char *found_bind)
291{ 838{
292 unsigned long i; 839 unsigned long i;
840 struct stat s;
841 char dynamic = 0;
842
843 if (!show_bind) return NULL;
844 if (!elf->phdr) return NULL;
845
846#define SHOW_BIND(B) \
847 if (elf->elf_class == ELFCLASS ## B) { \
848 Elf ## B ## _Dyn *dyn; \
849 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
850 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
851 Elf ## B ## _Off offset; \
852 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
853 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
854 dynamic = 1; \
855 offset = EGET(phdr[i].p_offset); \
856 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
857 dyn = DYN ## B (elf->data + offset); \
858 while (EGET(dyn->d_tag) != DT_NULL) { \
859 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
860 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
861 { \
862 if (be_quiet) return NULL; \
863 *found_bind = 1; \
864 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
865 } \
866 ++dyn; \
867 } \
868 } \
869 }
870 SHOW_BIND(32)
871 SHOW_BIND(64)
872
873 if (be_wewy_wewy_quiet) return NULL;
874
875 /* don't output anything if quiet mode and the ELF is static or not setuid */
876 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
877 return NULL;
878 } else {
879 *found_bind = 1;
880 return (char *) (dynamic ? "LAZY" : "STATIC");
881 }
882}
883static char *scanelf_file_soname(elfobj *elf, char *found_soname)
884{
885 unsigned long i;
886 char *soname;
887 void *strtbl_void;
888
889 if (!show_soname) return NULL;
890
891 strtbl_void = elf_findsecbyname(elf, ".dynstr");
892
893 if (elf->phdr && strtbl_void) {
894#define SHOW_SONAME(B) \
895 if (elf->elf_class == ELFCLASS ## B) { \
896 Elf ## B ## _Dyn *dyn; \
897 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
898 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
899 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
900 Elf ## B ## _Off offset; \
901 /* only look for soname in shared objects */ \
902 if (ehdr->e_type != ET_DYN) \
903 return NULL; \
904 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
905 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
906 offset = EGET(phdr[i].p_offset); \
907 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
908 dyn = DYN ## B (elf->data + offset); \
909 while (EGET(dyn->d_tag) != DT_NULL) { \
910 if (EGET(dyn->d_tag) == DT_SONAME) { \
911 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
912 if (offset >= (Elf ## B ## _Off)elf->len) { \
913 ++dyn; \
914 continue; \
915 } \
916 soname = (char*)(elf->data + offset); \
917 *found_soname = 1; \
918 return (be_wewy_wewy_quiet ? NULL : soname); \
919 } \
920 ++dyn; \
921 } \
922 } }
923 SHOW_SONAME(32)
924 SHOW_SONAME(64)
925 }
926
927 return NULL;
928}
929static char *scanelf_file_sym(elfobj *elf, char *found_sym)
930{
931 unsigned long i;
932 char *ret;
293 void *symtab_void, *strtab_void; 933 void *symtab_void, *strtab_void;
294 934
295 if (!find_sym) return NULL; 935 if (!find_sym) return NULL;
936 ret = find_sym;
296 937
297 symtab_void = elf_findsecbyname(elf, ".symtab"); 938 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
298 strtab_void = elf_findsecbyname(elf, ".strtab");
299 939
300 if (symtab_void && strtab_void) { 940 if (symtab_void && strtab_void) {
301#define FIND_SYM(B) \ 941#define FIND_SYM(B) \
302 if (elf->elf_class == ELFCLASS ## B) { \ 942 if (elf->elf_class == ELFCLASS ## B) { \
303 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 943 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
304 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 944 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
305 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 945 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
306 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 946 unsigned long cnt = EGET(symtab->sh_entsize); \
307 char *symname; \ 947 char *symname; \
948 if (cnt) \
949 cnt = EGET(symtab->sh_size) / cnt; \
308 for (i = 0; i < cnt; ++i) { \ 950 for (i = 0; i < cnt; ++i) { \
309 if (sym->st_name) { \ 951 if (sym->st_name) { \
952 /* make sure the symbol name is in acceptable memory range */ \
310 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 953 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
954 if ((void*)symname > (void*)elf->data_end) { \
955 warnf("%s: corrupt ELF symbols", elf->filename); \
956 ++sym; \
957 continue; \
958 } \
959 /* debug display ... show all symbols and some extra info */ \
311 if (*find_sym == '*') { \ 960 if (*ret == '*') { \
312 printf("%s(%s) %5lX %15s %s\n", \ 961 printf("%s(%s) %5lX %15s %s\n", \
313 ((*found_sym == 0) ? "\n\t" : "\t"), \ 962 ((*found_sym == 0) ? "\n\t" : "\t"), \
314 (char *)basename(filename), \ 963 elf->base_filename, \
315 (long)sym->st_size, \ 964 (unsigned long)sym->st_size, \
316 (char *)get_elfstttype(sym->st_info), \ 965 get_elfstttype(sym->st_info), \
317 symname); \ 966 symname); \
318 *found_sym = 1; \ 967 *found_sym = 1; \
319 } else if ((strcmp(find_sym, symname) == 0) || \ 968 } else { \
320 (strcmp(symname, versioned_symname) == 0)) \ 969 /* allow the user to specify a comma delimited list of symbols to search for */ \
970 char *this_sym, *this_sym_ver, *next_sym; \
971 this_sym = ret; \
972 this_sym_ver = versioned_symname; \
973 do { \
974 next_sym = strchr(this_sym, ','); \
975 if (next_sym == NULL) \
976 next_sym = this_sym + strlen(this_sym); \
977 /* do we want a defined symbol ? */ \
978 if (*this_sym == '+') { \
979 if (sym->st_shndx == SHN_UNDEF) \
980 goto skip_this_sym##B; \
981 ++this_sym; \
982 ++this_sym_ver; \
983 /* do we want an undefined symbol ? */ \
984 } else if (*this_sym == '-') { \
985 if (sym->st_shndx != SHN_UNDEF) \
986 goto skip_this_sym##B; \
987 ++this_sym; \
988 ++this_sym_ver; \
989 } \
990 /* ok, lets compare the name now */ \
991 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
992 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
993 if (be_semi_verbose) { \
994 char buf[126]; \
995 snprintf(buf, sizeof(buf), "%lX %s %s", \
996 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
997 ret = buf; \
998 } else \
999 ret = this_sym; \
321 (*found_sym)++; \ 1000 (*found_sym)++; \
1001 goto break_out; \
1002 } \
1003 skip_this_sym##B: this_sym = next_sym + 1; \
1004 } while (*next_sym != '\0'); \
1005 } \
322 } \ 1006 } \
323 ++sym; \ 1007 ++sym; \
324 } } 1008 } }
325 FIND_SYM(32) 1009 FIND_SYM(32)
326 FIND_SYM(64) 1010 FIND_SYM(64)
327 } 1011 }
1012
1013break_out:
1014 if (be_wewy_wewy_quiet) return NULL;
1015
328 if (*find_sym != '*' && *found_sym) 1016 if (*find_sym != '*' && *found_sym)
329 return find_sym; 1017 return ret;
330 if (be_quiet) 1018 if (be_quiet)
331 return NULL; 1019 return NULL;
332 else 1020 else
333 return " - "; 1021 return (char *)" - ";
334} 1022}
1023
1024
1025static char *scanelf_file_sections(elfobj *elf, char *found_section)
1026{
1027 if (!find_section)
1028 return NULL;
1029
1030#define FIND_SECTION(B) \
1031 if (elf->elf_class == ELFCLASS ## B) { \
1032 int invert; \
1033 Elf ## B ## _Shdr *section; \
1034 invert = (*find_section == '!' ? 1 : 0); \
1035 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1036 if ((section == NULL && invert) || (section != NULL && !invert)) \
1037 *found_section = 1; \
1038 }
1039 FIND_SECTION(32)
1040 FIND_SECTION(64)
1041
1042 if (be_wewy_wewy_quiet)
1043 return NULL;
1044
1045 if (*found_section)
1046 return find_section;
1047
1048 if (be_quiet)
1049 return NULL;
1050 else
1051 return (char *)" - ";
1052}
1053
335/* scan an elf file and show all the fun stuff */ 1054/* scan an elf file and show all the fun stuff */
336#define prints(str) fputs(str, stdout) 1055#define prints(str) write(fileno(stdout), str, strlen(str))
337static void scanelf_file(const char *filename) 1056static int scanelf_elfobj(elfobj *elf)
338{ 1057{
339 unsigned long i; 1058 unsigned long i;
340 char found_pax, found_stack, found_relro, found_textrel, 1059 char found_pax, found_phdr, found_relro, found_load, found_textrel,
341 found_rpath, found_needed, found_interp, found_sym, 1060 found_rpath, found_needed, found_interp, found_bind, found_soname,
342 found_file; 1061 found_sym, found_lib, found_file, found_textrels, found_section;
343 elfobj *elf;
344 struct stat st;
345 static char *out_buffer = NULL; 1062 static char *out_buffer = NULL;
346 static size_t out_len; 1063 static size_t out_len;
347 1064
348 /* make sure 'filename' exists */
349 if (lstat(filename, &st) == -1) {
350 if (be_verbose > 2) printf("%s: does not exist\n", filename);
351 return;
352 }
353 /* always handle regular files and handle symlinked files if no -y */
354 if (!(S_ISREG(st.st_mode) || (S_ISLNK(st.st_mode) && scan_symlink))) {
355 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
356 return;
357 }
358
359 found_pax = found_stack = found_relro = found_textrel = \ 1065 found_pax = found_phdr = found_relro = found_load = found_textrel = \
360 found_rpath = found_needed = found_interp = found_sym = \ 1066 found_rpath = found_needed = found_interp = found_bind = found_soname = \
361 found_file = 0; 1067 found_sym = found_lib = found_file = found_textrels = found_section = 0;
362 1068
363 /* verify this is real ELF */
364 if ((elf = readelf(filename)) == NULL) {
365 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
366 return;
367 }
368
369 if (be_verbose > 1) 1069 if (be_verbose > 2)
370 printf("%s: scanning file {%s,%s}\n", filename, 1070 printf("%s: scanning file {%s,%s}\n", elf->filename,
371 get_elfeitype(elf, EI_CLASS, elf->elf_class), 1071 get_elfeitype(EI_CLASS, elf->elf_class),
372 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA])); 1072 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
373 else if (be_verbose) 1073 else if (be_verbose > 1)
374 printf("%s: scanning file\n", filename); 1074 printf("%s: scanning file\n", elf->filename);
375 1075
376 /* init output buffer */ 1076 /* init output buffer */
377 if (!out_buffer) { 1077 if (!out_buffer) {
378 out_len = sizeof(char) * 80; 1078 out_len = sizeof(char) * 80;
379 out_buffer = (char*)xmalloc(out_len); 1079 out_buffer = (char*)xmalloc(out_len);
380 } 1080 }
381 *out_buffer = '\0'; 1081 *out_buffer = '\0';
382 1082
383 /* show the header */ 1083 /* show the header */
384 if (!be_quiet && show_banner) { 1084 if (!be_quiet && show_banner) {
385 for (i=0; out_format[i]; ++i) { 1085 for (i = 0; out_format[i]; ++i) {
386 if (out_format[i] != '%') continue; 1086 if (!IS_MODIFIER(out_format[i])) continue;
387 1087
388 switch (out_format[++i]) { 1088 switch (out_format[++i]) {
1089 case '+': break;
389 case '%': break; 1090 case '%': break;
1091 case '#': break;
1092 case 'F':
1093 case 'p':
390 case 'F': prints("FILE "); break; 1094 case 'f': prints("FILE "); found_file = 1; break;
391 case 'o': prints(" TYPE "); break; 1095 case 'o': prints(" TYPE "); break;
392 case 'x': prints(" PAX "); break; 1096 case 'x': prints(" PAX "); break;
393 case 'e': prints("STK/REL "); break; 1097 case 'e': prints("STK/REL/PTL "); break;
394 case 't': prints("TEXTREL "); break; 1098 case 't': prints("TEXTREL "); break;
395 case 'r': prints("RPATH "); break; 1099 case 'r': prints("RPATH "); break;
1100 case 'M': prints("CLASS "); break;
396 case 'n': prints("NEEDED "); break; 1101 case 'n': prints("NEEDED "); break;
397 case 'i': prints("INTERP "); break; 1102 case 'i': prints("INTERP "); break;
1103 case 'b': prints("BIND "); break;
1104 case 'S': prints("SONAME "); break;
398 case 's': prints("SYM "); break; 1105 case 's': prints("SYM "); break;
1106 case 'N': prints("LIB "); break;
1107 case 'T': prints("TEXTRELS "); break;
1108 case 'k': prints("SECTION "); break;
1109 case 'a': prints("ARCH "); break;
1110 default: warnf("'%c' has no title ?", out_format[i]);
399 } 1111 }
400 } 1112 }
1113 if (!found_file) prints("FILE ");
401 prints("\n"); 1114 prints("\n");
1115 found_file = 0;
402 show_banner = 0; 1116 show_banner = 0;
403 } 1117 }
404 1118
405 /* dump all the good stuff */ 1119 /* dump all the good stuff */
406 for (i=0; out_format[i]; ++i) { 1120 for (i = 0; out_format[i]; ++i) {
407 const char *out; 1121 const char *out;
1122 const char *tmp;
408 1123
409 /* make sure we trim leading spaces in quiet mode */ 1124 if (!IS_MODIFIER(out_format[i])) {
410 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
411 *out_buffer = '\0';
412
413 if (out_format[i] != '%') {
414 xchrcat(&out_buffer, out_format[i], &out_len); 1125 xchrcat(&out_buffer, out_format[i], &out_len);
415 continue; 1126 continue;
416 } 1127 }
417 1128
418 out = NULL; 1129 out = NULL;
1130 be_wewy_wewy_quiet = (out_format[i] == '#');
1131 be_semi_verbose = (out_format[i] == '+');
419 switch (out_format[++i]) { 1132 switch (out_format[++i]) {
1133 case '+':
1134 case '%':
1135 case '#':
420 case '%': xchrcat(&out_buffer, '%', &out_len); break; 1136 xchrcat(&out_buffer, out_format[i], &out_len); break;
421 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break; 1137 case 'F':
1138 found_file = 1;
1139 if (be_wewy_wewy_quiet) break;
1140 xstrcat(&out_buffer, elf->filename, &out_len);
1141 break;
1142 case 'p':
1143 found_file = 1;
1144 if (be_wewy_wewy_quiet) break;
1145 tmp = elf->filename;
1146 if (search_path) {
1147 ssize_t len_search = strlen(search_path);
1148 ssize_t len_file = strlen(elf->filename);
1149 if (!strncmp(elf->filename, search_path, len_search) && \
1150 len_file > len_search)
1151 tmp += len_search;
1152 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1153 }
1154 xstrcat(&out_buffer, tmp, &out_len);
1155 break;
1156 case 'f':
1157 found_file = 1;
1158 if (be_wewy_wewy_quiet) break;
1159 tmp = strrchr(elf->filename, '/');
1160 tmp = (tmp == NULL ? elf->filename : tmp+1);
1161 xstrcat(&out_buffer, tmp, &out_len);
1162 break;
422 case 'o': out = get_elfetype(elf); break; 1163 case 'o': out = get_elfetype(elf); break;
423 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1164 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
424 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break; 1165 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
425 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1166 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1167 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
426 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1168 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1169 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1170 case 'n':
427 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break; 1171 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
428 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1172 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1173 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1174 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
429 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break; 1175 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1176 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1177 case 'a': out = get_elfemtype(elf); break;
1178 default: warnf("'%c' has no scan code?", out_format[i]);
430 } 1179 }
1180 if (out) {
1181 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1182 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1183 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1184 else
431 if (out) xstrcat(&out_buffer, out, &out_len); 1185 xstrcat(&out_buffer, out, &out_len);
432 } 1186 }
1187 }
433 1188
434 if (!found_file) { 1189#define FOUND_SOMETHING() \
435 if (!be_quiet || found_pax || found_stack || found_textrel || \ 1190 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
436 found_rpath || found_needed || found_interp || found_sym) 1191 found_rpath || found_needed || found_interp || found_bind || \
1192 found_soname || found_sym || found_lib || found_textrels || found_section )
1193
1194 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1195 xchrcat(&out_buffer, ' ', &out_len);
437 xstrcat(&out_buffer, filename, &out_len); 1196 xstrcat(&out_buffer, elf->filename, &out_len);
438 } 1197 }
439 if (!(be_quiet && xemptybuffer(out_buffer))) 1198 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
440 puts(out_buffer); 1199 puts(out_buffer);
1200 fflush(stdout);
1201 }
441 1202
1203 return 0;
1204}
1205
1206/* scan a single elf */
1207static int scanelf_elf(const char *filename, int fd, size_t len)
1208{
1209 int ret = 1;
1210 elfobj *elf;
1211
1212 /* verify this is real ELF */
1213 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1214 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1215 return ret;
1216 }
1217 switch (match_bits) {
1218 case 32:
1219 if (elf->elf_class != ELFCLASS32)
1220 goto label_done;
1221 break;
1222 case 64:
1223 if (elf->elf_class != ELFCLASS64)
1224 goto label_done;
1225 break;
1226 default: break;
1227 }
1228 if (strlen(match_etypes)) {
1229 char sbuf[126];
1230 strncpy(sbuf, match_etypes, sizeof(sbuf));
1231 if (strchr(match_etypes, ',') != NULL) {
1232 char *p;
1233 while((p = strrchr(sbuf, ',')) != NULL) {
1234 *p = 0;
1235 if (etype_lookup(p+1) == get_etype(elf))
1236 goto label_ret;
1237 }
1238 }
1239 if (etype_lookup(sbuf) != get_etype(elf))
1240 goto label_done;
1241 }
1242
1243label_ret:
1244 ret = scanelf_elfobj(elf);
1245
1246label_done:
442 unreadelf(elf); 1247 unreadelf(elf);
1248 return ret;
1249}
1250
1251/* scan an archive of elfs */
1252static int scanelf_archive(const char *filename, int fd, size_t len)
1253{
1254 archive_handle *ar;
1255 archive_member *m;
1256 char *ar_buffer;
1257 elfobj *elf;
1258
1259 ar = ar_open_fd(filename, fd);
1260 if (ar == NULL)
1261 return 1;
1262
1263 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1264 while ((m=ar_next(ar)) != NULL) {
1265 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1266 if (elf) {
1267 scanelf_elfobj(elf);
1268 unreadelf(elf);
1269 }
1270 }
1271 munmap(ar_buffer, len);
1272
1273 return 0;
1274}
1275/* scan a file which may be an elf or an archive or some other magical beast */
1276static int scanelf_file(const char *filename, const struct stat *st_cache)
1277{
1278 const struct stat *st = st_cache;
1279 struct stat symlink_st;
1280 int fd;
1281
1282 /* always handle regular files and handle symlinked files if no -y */
1283 if (S_ISLNK(st->st_mode)) {
1284 if (!scan_symlink) return 1;
1285 stat(filename, &symlink_st);
1286 st = &symlink_st;
1287 }
1288
1289 if (!S_ISREG(st->st_mode)) {
1290 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1291 return 1;
1292 }
1293
1294 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1295 return 1;
1296
1297 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1298 /* if it isn't an ELF, maybe it's an .a archive */
1299 scanelf_archive(filename, fd, st->st_size);
1300
1301 close(fd);
1302 return 0;
443} 1303}
444 1304
445/* scan a directory for ET_EXEC files and print when we find one */ 1305/* scan a directory for ET_EXEC files and print when we find one */
446static void scanelf_dir(const char *path) 1306static int scanelf_dir(const char *path)
447{ 1307{
448 register DIR *dir; 1308 register DIR *dir;
449 register struct dirent *dentry; 1309 register struct dirent *dentry;
450 struct stat st_top, st; 1310 struct stat st_top, st;
451 char buf[_POSIX_PATH_MAX]; 1311 char buf[__PAX_UTILS_PATH_MAX];
452 size_t pathlen = 0, len = 0; 1312 size_t pathlen = 0, len = 0;
1313 int ret = 0;
453 1314
454 /* make sure path exists */ 1315 /* make sure path exists */
455 if (lstat(path, &st_top) == -1) { 1316 if (lstat(path, &st_top) == -1) {
456 if (be_verbose > 2) printf("%s: does not exist\n", path); 1317 if (be_verbose > 2) printf("%s: does not exist\n", path);
457 return; 1318 return 1;
458 } 1319 }
459 1320
460 /* ok, if it isn't a directory, assume we can open it */ 1321 /* ok, if it isn't a directory, assume we can open it */
461 if (!S_ISDIR(st_top.st_mode)) { 1322 if (!S_ISDIR(st_top.st_mode)) {
462 scanelf_file(path); 1323 return scanelf_file(path, &st_top);
463 return;
464 } 1324 }
465 1325
466 /* now scan the dir looking for fun stuff */ 1326 /* now scan the dir looking for fun stuff */
467 if ((dir = opendir(path)) == NULL) { 1327 if ((dir = opendir(path)) == NULL) {
468 warnf("could not opendir %s: %s", path, strerror(errno)); 1328 warnf("could not opendir %s: %s", path, strerror(errno));
469 return; 1329 return 1;
470 } 1330 }
471 if (be_verbose) printf("%s: scanning dir\n", path); 1331 if (be_verbose > 1) printf("%s: scanning dir\n", path);
472 1332
473 pathlen = strlen(path); 1333 pathlen = strlen(path);
474 while ((dentry = readdir(dir))) { 1334 while ((dentry = readdir(dir))) {
475 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1335 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
476 continue; 1336 continue;
477 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1337 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
478 if (len >= sizeof(buf)) { 1338 if (len >= sizeof(buf)) {
479 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf)); 1339 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1340 (unsigned long)len, (unsigned long)sizeof(buf));
480 continue; 1341 continue;
481 } 1342 }
482 sprintf(buf, "%s/%s", path, dentry->d_name); 1343 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
483 if (lstat(buf, &st) != -1) { 1344 if (lstat(buf, &st) != -1) {
484 if (S_ISREG(st.st_mode)) 1345 if (S_ISREG(st.st_mode))
485 scanelf_file(buf); 1346 ret = scanelf_file(buf, &st);
486 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1347 else if (dir_recurse && S_ISDIR(st.st_mode)) {
487 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1348 if (dir_crossmount || (st_top.st_dev == st.st_dev))
488 scanelf_dir(buf); 1349 ret = scanelf_dir(buf);
489 } 1350 }
490 } 1351 }
491 } 1352 }
492 closedir(dir); 1353 closedir(dir);
1354 return ret;
493} 1355}
1356
1357static int scanelf_from_file(const char *filename)
1358{
1359 FILE *fp = NULL;
1360 char *p;
1361 char path[__PAX_UTILS_PATH_MAX];
1362 int ret = 0;
1363
1364 if (strcmp(filename, "-") == 0)
1365 fp = stdin;
1366 else if ((fp = fopen(filename, "r")) == NULL)
1367 return 1;
1368
1369 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1370 if ((p = strchr(path, '\n')) != NULL)
1371 *p = 0;
1372 search_path = path;
1373 ret = scanelf_dir(path);
1374 }
1375 if (fp != stdin)
1376 fclose(fp);
1377 return ret;
1378}
1379
1380#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1381
1382static int load_ld_cache_config(int i, const char *fname)
1383{
1384 FILE *fp = NULL;
1385 char *p;
1386 char path[__PAX_UTILS_PATH_MAX];
1387
1388 if (i + 1 == ARRAY_SIZE(ldpaths))
1389 return i;
1390
1391 if ((fp = fopen(fname, "r")) == NULL)
1392 return i;
1393
1394 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1395 if ((p = strrchr(path, '\r')) != NULL)
1396 *p = 0;
1397 if ((p = strchr(path, '\n')) != NULL)
1398 *p = 0;
1399#ifdef __linux__
1400 // recursive includes of the same file will make this segfault.
1401 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1402 glob64_t gl;
1403 size_t x;
1404 char gpath[__PAX_UTILS_PATH_MAX];
1405
1406 memset(gpath, 0, sizeof(gpath));
1407
1408 if (path[8] != '/')
1409 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1410 else
1411 strncpy(gpath, &path[8], sizeof(gpath));
1412
1413 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1414 for (x = 0; x < gl.gl_pathc; ++x) {
1415 /* try to avoid direct loops */
1416 if (strcmp(gl.gl_pathv[x], fname) == 0)
1417 continue;
1418 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1419 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1420 globfree64(&gl);
1421 return i;
1422 }
1423 }
1424 globfree64 (&gl);
1425 continue;
1426 }
1427 }
1428#endif
1429 if (*path != '/')
1430 continue;
1431
1432 ldpaths[i++] = xstrdup(path);
1433
1434 if (i + 1 == ARRAY_SIZE(ldpaths))
1435 break;
1436 }
1437 ldpaths[i] = NULL;
1438
1439 fclose(fp);
1440 return i;
1441}
1442
1443#elif defined(__FreeBSD__) || (__DragonFly__)
1444
1445static int load_ld_cache_config(int i, const char *fname)
1446{
1447 FILE *fp = NULL;
1448 char *b = NULL, *p;
1449 struct elfhints_hdr hdr;
1450
1451 if (i + 1 == ARRAY_SIZE(ldpaths))
1452 return i;
1453
1454 if ((fp = fopen(fname, "r")) == NULL)
1455 return i;
1456
1457 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1458 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1459 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1460 {
1461 fclose(fp);
1462 return i;
1463 }
1464
1465 b = (char*)malloc(hdr.dirlistlen+1);
1466 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1467 fclose(fp);
1468 free(b);
1469 return i;
1470 }
1471
1472 while ((p = strsep(&b, ":"))) {
1473 if (*p == '\0') continue;
1474 ldpaths[i++] = xstrdup(p);
1475
1476 if (i + 1 == ARRAY_SIZE(ldpaths))
1477 break;
1478 }
1479 ldpaths[i] = NULL;
1480
1481 free(b);
1482 fclose(fp);
1483 return i;
1484}
1485
1486#else
1487
1488#warning Cache config support not implemented for your target
1489static int load_ld_cache_config(int i, const char *fname)
1490{
1491 memset(ldpaths, 0x00, sizeof(ldpaths));
1492}
1493
1494#endif
494 1495
495/* scan /etc/ld.so.conf for paths */ 1496/* scan /etc/ld.so.conf for paths */
496static void scanelf_ldpath() 1497static void scanelf_ldpath()
497{ 1498{
498 char scan_l, scan_ul, scan_ull; 1499 char scan_l, scan_ul, scan_ull;
499 char *path, *p; 1500 int i = 0;
500 FILE *fp;
501 1501
502 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1502 if (!ldpaths[0])
503 err("Unable to open ld.so.conf: %s", strerror(errno)); 1503 err("Unable to load any paths from ld.so.conf");
504 1504
505 scan_l = scan_ul = scan_ull = 0; 1505 scan_l = scan_ul = scan_ull = 0;
506 1506
507 path = (char*)xmalloc(_POSIX_PATH_MAX); 1507 while (ldpaths[i]) {
508 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL)
509 if (*path == '/') {
510 if ((p = strrchr(path, '\r')) != NULL)
511 *p = 0;
512 if ((p = strrchr(path, '\n')) != NULL)
513 *p = 0;
514 if (!scan_l && !strcmp(path, "/lib")) scan_l = 1; 1508 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
515 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1; 1509 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
516 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1; 1510 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
517 scanelf_dir(path); 1511 scanelf_dir(ldpaths[i]);
1512 ++i;
518 } 1513 }
519 free(path);
520 fclose(fp);
521 1514
522 if (!scan_l) scanelf_dir("/lib"); 1515 if (!scan_l) scanelf_dir("/lib");
523 if (!scan_ul) scanelf_dir("/usr/lib"); 1516 if (!scan_ul) scanelf_dir("/usr/lib");
524 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1517 if (!scan_ull) scanelf_dir("/usr/local/lib");
525} 1518}
540 } 1533 }
541 1534
542 free(path); 1535 free(path);
543} 1536}
544 1537
545
546
547/* usage / invocation handling functions */ 1538/* usage / invocation handling functions */
548#define PARSE_FLAGS "plRmyxetrnis:aqvF:o:BhV" 1539#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
549#define a_argument required_argument 1540#define a_argument required_argument
550static struct option const long_opts[] = { 1541static struct option const long_opts[] = {
551 {"path", no_argument, NULL, 'p'}, 1542 {"path", no_argument, NULL, 'p'},
552 {"ldpath", no_argument, NULL, 'l'}, 1543 {"ldpath", no_argument, NULL, 'l'},
553 {"recursive", no_argument, NULL, 'R'}, 1544 {"recursive", no_argument, NULL, 'R'},
554 {"mount", no_argument, NULL, 'm'}, 1545 {"mount", no_argument, NULL, 'm'},
555 {"symlink", no_argument, NULL, 'y'}, 1546 {"symlink", no_argument, NULL, 'y'},
1547 {"archives", no_argument, NULL, 'A'},
1548 {"ldcache", no_argument, NULL, 'L'},
1549 {"fix", no_argument, NULL, 'X'},
1550 {"setpax", a_argument, NULL, 'z'},
556 {"pax", no_argument, NULL, 'x'}, 1551 {"pax", no_argument, NULL, 'x'},
557 {"header", no_argument, NULL, 'e'}, 1552 {"header", no_argument, NULL, 'e'},
558 {"textrel", no_argument, NULL, 't'}, 1553 {"textrel", no_argument, NULL, 't'},
559 {"rpath", no_argument, NULL, 'r'}, 1554 {"rpath", no_argument, NULL, 'r'},
560 {"needed", no_argument, NULL, 'n'}, 1555 {"needed", no_argument, NULL, 'n'},
561 {"interp", no_argument, NULL, 'i'}, 1556 {"interp", no_argument, NULL, 'i'},
1557 {"bind", no_argument, NULL, 'b'},
1558 {"soname", no_argument, NULL, 'S'},
562 {"symbol", a_argument, NULL, 's'}, 1559 {"symbol", a_argument, NULL, 's'},
1560 {"section", a_argument, NULL, 'k'},
1561 {"lib", a_argument, NULL, 'N'},
1562 {"gmatch", no_argument, NULL, 'g'},
1563 {"textrels", no_argument, NULL, 'T'},
1564 {"etype", a_argument, NULL, 'E'},
1565 {"bits", a_argument, NULL, 'M'},
563 {"all", no_argument, NULL, 'a'}, 1566 {"all", no_argument, NULL, 'a'},
564 {"quiet", no_argument, NULL, 'q'}, 1567 {"quiet", no_argument, NULL, 'q'},
565 {"verbose", no_argument, NULL, 'v'}, 1568 {"verbose", no_argument, NULL, 'v'},
566 {"format", a_argument, NULL, 'F'}, 1569 {"format", a_argument, NULL, 'F'},
1570 {"from", a_argument, NULL, 'f'},
567 {"file", a_argument, NULL, 'o'}, 1571 {"file", a_argument, NULL, 'o'},
568 {"nobanner", no_argument, NULL, 'B'}, 1572 {"nobanner", no_argument, NULL, 'B'},
569 {"help", no_argument, NULL, 'h'}, 1573 {"help", no_argument, NULL, 'h'},
570 {"version", no_argument, NULL, 'V'}, 1574 {"version", no_argument, NULL, 'V'},
571 {NULL, no_argument, NULL, 0x0} 1575 {NULL, no_argument, NULL, 0x0}
572}; 1576};
1577
573static char *opts_help[] = { 1578static const char *opts_help[] = {
574 "Scan all directories in PATH environment", 1579 "Scan all directories in PATH environment",
575 "Scan all directories in /etc/ld.so.conf", 1580 "Scan all directories in /etc/ld.so.conf",
576 "Scan directories recursively", 1581 "Scan directories recursively",
577 "Don't recursively cross mount points", 1582 "Don't recursively cross mount points",
578 "Don't scan symlinks\n", 1583 "Don't scan symlinks",
1584 "Scan archives (.a files)",
1585 "Utilize ld.so.cache information (use with -r/-n)",
1586 "Try and 'fix' bad things (use with -r/-e)",
1587 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
579 "Print PaX markings", 1588 "Print PaX markings",
580 "Print GNU_STACK markings", 1589 "Print GNU_STACK/PT_LOAD markings",
581 "Print TEXTREL information", 1590 "Print TEXTREL information",
582 "Print RPATH information", 1591 "Print RPATH information",
583 "Print NEEDED information", 1592 "Print NEEDED information",
584 "Print INTERP information", 1593 "Print INTERP information",
1594 "Print BIND information",
1595 "Print SONAME information",
585 "Find a specified symbol", 1596 "Find a specified symbol",
1597 "Find a specified section",
1598 "Find a specified library",
1599 "Use strncmp to match libraries. (use with -N)",
1600 "Locate cause of TEXTREL",
1601 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1602 "Print only ELF files matching numeric bits",
586 "Print all scanned info (-x -e -t -r)\n", 1603 "Print all scanned info (-x -e -t -r -b)\n",
587 "Only output 'bad' things", 1604 "Only output 'bad' things",
588 "Be verbose (can be specified more than once)", 1605 "Be verbose (can be specified more than once)",
589 "Use specified format for output", 1606 "Use specified format for output",
1607 "Read input stream from a filename",
590 "Write output stream to a filename", 1608 "Write output stream to a filename",
591 "Don't display the header", 1609 "Don't display the header",
592 "Print this help and exit", 1610 "Print this help and exit",
593 "Print version and exit", 1611 "Print version and exit",
594 NULL 1612 NULL
596 1614
597/* display usage and exit */ 1615/* display usage and exit */
598static void usage(int status) 1616static void usage(int status)
599{ 1617{
600 unsigned long i; 1618 unsigned long i;
601 printf(" Scan ELF binaries for stuff\n\n" 1619 printf("* Scan ELF binaries for stuff\n\n"
602 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1620 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
603 printf("Options: -[%s]\n", PARSE_FLAGS); 1621 printf("Options: -[%s]\n", PARSE_FLAGS);
604 for (i = 0; long_opts[i].name; ++i) 1622 for (i = 0; long_opts[i].name; ++i)
605 if (long_opts[i].has_arg == no_argument) 1623 if (long_opts[i].has_arg == no_argument)
606 printf(" -%c, --%-13s %s\n", long_opts[i].val, 1624 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
607 long_opts[i].name, opts_help[i]); 1625 long_opts[i].name, opts_help[i]);
608 else 1626 else
609 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val, 1627 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
610 long_opts[i].name, opts_help[i]); 1628 long_opts[i].name, opts_help[i]);
1629
1630 puts("\nFor more information, see the scanelf(1) manpage");
611 exit(status); 1631 exit(status);
612} 1632}
613 1633
614/* parse command line arguments and preform needed actions */ 1634/* parse command line arguments and preform needed actions */
1635#define do_pax_state(option, flag) \
1636 if (islower(option)) { \
1637 flags &= ~PF_##flag; \
1638 flags |= PF_NO##flag; \
1639 } else { \
1640 flags &= ~PF_NO##flag; \
1641 flags |= PF_##flag; \
1642 }
615static void parseargs(int argc, char *argv[]) 1643static int parseargs(int argc, char *argv[])
616{ 1644{
617 int flag; 1645 int i;
1646 const char *from_file = NULL;
1647 int ret = 0;
618 1648
619 opterr = 0; 1649 opterr = 0;
620 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1650 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
621 switch (flag) { 1651 switch (i) {
622 1652
623 case 'V': 1653 case 'V':
624 printf("%s compiled %s\n%s\n" 1654 printf("pax-utils-%s: %s compiled %s\n%s\n"
625 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 1655 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
626 __FILE__, __DATE__, rcsid, argv0); 1656 VERSION, __FILE__, __DATE__, rcsid, argv0);
627 exit(EXIT_SUCCESS); 1657 exit(EXIT_SUCCESS);
628 break; 1658 break;
629 case 'h': usage(EXIT_SUCCESS); break; 1659 case 'h': usage(EXIT_SUCCESS); break;
630 1660 case 'f':
1661 if (from_file) warn("You prob don't want to specify -f twice");
1662 from_file = optarg;
1663 break;
1664 case 'E':
1665 strncpy(match_etypes, optarg, sizeof(match_etypes));
1666 break;
1667 case 'M':
1668 match_bits = atoi(optarg);
1669 break;
631 case 'o': { 1670 case 'o': {
632 FILE *fp = NULL;
633 fp = freopen(optarg, "w", stdout); 1671 if (freopen(optarg, "w", stdout) == NULL)
634 if (fp == NULL)
635 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1672 err("Could not open output stream '%s': %s", optarg, strerror(errno));
636 stdout = fp;
637 break; 1673 break;
638 } 1674 }
639 1675 case 'k':
1676 if (find_section) warn("You prob don't want to specify -k twice");
1677 find_section = optarg;
1678 break;
640 case 's': { 1679 case 's': {
641 size_t len; 1680 if (find_sym) warn("You prob don't want to specify -s twice");
642 find_sym = xstrdup(optarg); 1681 find_sym = optarg;
643 len = strlen(find_sym) + 1;
644 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1)); 1682 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
645 sprintf(versioned_symname, "%s@", find_sym); 1683 sprintf(versioned_symname, "%s@", find_sym);
646 break; 1684 break;
647 } 1685 }
1686 case 'N': {
1687 if (find_lib) warn("You prob don't want to specify -N twice");
1688 find_lib = optarg;
1689 break;
1690 }
648 1691
649 case 'F': { 1692 case 'F': {
1693 if (out_format) warn("You prob don't want to specify -F twice");
650 out_format = strdup(optarg); 1694 out_format = optarg;
1695 break;
1696 }
1697 case 'z': {
1698 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1699 size_t x;
1700
1701 for (x = 0 ; x < strlen(optarg); x++) {
1702 switch(optarg[x]) {
1703 case 'p':
1704 case 'P':
1705 do_pax_state(optarg[x], PAGEEXEC);
651 break; 1706 break;
1707 case 's':
1708 case 'S':
1709 do_pax_state(optarg[x], SEGMEXEC);
1710 break;
1711 case 'm':
1712 case 'M':
1713 do_pax_state(optarg[x], MPROTECT);
1714 break;
1715 case 'e':
1716 case 'E':
1717 do_pax_state(optarg[x], EMUTRAMP);
1718 break;
1719 case 'r':
1720 case 'R':
1721 do_pax_state(optarg[x], RANDMMAP);
1722 break;
1723 case 'x':
1724 case 'X':
1725 do_pax_state(optarg[x], RANDEXEC);
1726 break;
1727 default:
1728 break;
1729 }
652 } 1730 }
653 1731 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1732 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1733 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1734 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1735 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1736 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1737 setpax = flags;
1738 break;
1739 }
1740 case 'g': gmatch = 1; break;
1741 case 'L': use_ldcache = 1; break;
654 case 'y': scan_symlink = 0; break; 1742 case 'y': scan_symlink = 0; break;
1743 case 'A': scan_archives = 1; break;
655 case 'B': show_banner = 0; break; 1744 case 'B': show_banner = 0; break;
656 case 'l': scan_ldpath = 1; break; 1745 case 'l': scan_ldpath = 1; break;
657 case 'p': scan_envpath = 1; break; 1746 case 'p': scan_envpath = 1; break;
658 case 'R': dir_recurse = 1; break; 1747 case 'R': dir_recurse = 1; break;
659 case 'm': dir_crossmount = 0; break; 1748 case 'm': dir_crossmount = 0; break;
1749 case 'X': ++fix_elf; break;
660 case 'x': show_pax = 1; break; 1750 case 'x': show_pax = 1; break;
661 case 'e': show_stack = 1; break; 1751 case 'e': show_phdr = 1; break;
662 case 't': show_textrel = 1; break; 1752 case 't': show_textrel = 1; break;
663 case 'r': show_rpath = 1; break; 1753 case 'r': show_rpath = 1; break;
664 case 'n': show_needed = 1; break; 1754 case 'n': show_needed = 1; break;
665 case 'i': show_interp = 1; break; 1755 case 'i': show_interp = 1; break;
1756 case 'b': show_bind = 1; break;
1757 case 'S': show_soname = 1; break;
1758 case 'T': show_textrels = 1; break;
666 case 'q': be_quiet = 1; break; 1759 case 'q': be_quiet = 1; break;
667 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1760 case 'v': be_verbose = (be_verbose % 20) + 1; break;
668 case 'a': show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 1; break; 1761 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
669 1762
670 case ':': 1763 case ':':
671 warn("Option missing parameter\n"); 1764 err("Option '%c' is missing parameter", optopt);
672 usage(EXIT_FAILURE);
673 break;
674 case '?': 1765 case '?':
675 warn("Unknown option\n"); 1766 err("Unknown option '%c' or argument missing", optopt);
676 usage(EXIT_FAILURE);
677 break;
678 default: 1767 default:
679 err("Unhandled option '%c'", flag); 1768 err("Unhandled option '%c'; please report this", i);
680 break;
681 }
682 } 1769 }
683 1770 }
684 if (be_quiet && be_verbose) 1771 if (show_textrels && be_verbose) {
685 err("You can be quiet or you can be verbose, not both, stupid"); 1772 if (which("objdump") != NULL)
686 1773 has_objdump = 1;
1774 }
687 /* let the format option override all other options */ 1775 /* let the format option override all other options */
688 if (out_format) { 1776 if (out_format) {
689 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0; 1777 show_pax = show_phdr = show_textrel = show_rpath = \
1778 show_needed = show_interp = show_bind = show_soname = \
1779 show_textrels = 0;
690 for (flag=0; out_format[flag]; ++flag) { 1780 for (i = 0; out_format[i]; ++i) {
691 if (out_format[flag] != '%') continue; 1781 if (!IS_MODIFIER(out_format[i])) continue;
692 1782
693 switch (out_format[++flag]) { 1783 switch (out_format[++i]) {
1784 case '+': break;
694 case '%': break; 1785 case '%': break;
1786 case '#': break;
695 case 'F': break; 1787 case 'F': break;
1788 case 'p': break;
1789 case 'f': break;
1790 case 'k': break;
696 case 's': break; 1791 case 's': break;
1792 case 'N': break;
697 case 'o': break; 1793 case 'o': break;
1794 case 'a': break;
1795 case 'M': break;
698 case 'x': show_pax = 1; break; 1796 case 'x': show_pax = 1; break;
699 case 'e': show_stack = 1; break; 1797 case 'e': show_phdr = 1; break;
700 case 't': show_textrel = 1; break; 1798 case 't': show_textrel = 1; break;
701 case 'r': show_rpath = 1; break; 1799 case 'r': show_rpath = 1; break;
702 case 'n': show_needed = 1; break; 1800 case 'n': show_needed = 1; break;
703 case 'i': show_interp = 1; break; 1801 case 'i': show_interp = 1; break;
1802 case 'b': show_bind = 1; break;
1803 case 'S': show_soname = 1; break;
1804 case 'T': show_textrels = 1; break;
704 default: 1805 default:
705 err("Invalid format specifier '%c' (byte %i)", 1806 err("Invalid format specifier '%c' (byte %i)",
706 out_format[flag], flag+1); 1807 out_format[i], i+1);
707 } 1808 }
708 } 1809 }
709 1810
710 /* construct our default format */ 1811 /* construct our default format */
711 } else { 1812 } else {
712 size_t fmt_len = 30; 1813 size_t fmt_len = 30;
713 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 1814 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
714 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 1815 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
715 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 1816 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
716 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len); 1817 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
717 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 1818 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
718 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 1819 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
719 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 1820 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
720 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 1821 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1822 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1823 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1824 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
721 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 1825 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1826 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1827 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
722 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1828 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
723 } 1829 }
724 if (be_verbose > 2) printf("Format: %s\n", out_format); 1830 if (be_verbose > 2) printf("Format: %s\n", out_format);
725 1831
726 /* now lets actually do the scanning */ 1832 /* now lets actually do the scanning */
1833 if (scan_ldpath || use_ldcache)
1834 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
727 if (scan_ldpath) scanelf_ldpath(); 1835 if (scan_ldpath) scanelf_ldpath();
728 if (scan_envpath) scanelf_envpath(); 1836 if (scan_envpath) scanelf_envpath();
1837 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1838 from_file = "-";
1839 if (from_file) {
1840 scanelf_from_file(from_file);
1841 from_file = *argv;
1842 }
729 if (optind == argc && !scan_ldpath && !scan_envpath) 1843 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
730 err("Nothing to scan !?"); 1844 err("Nothing to scan !?");
731 while (optind < argc) 1845 while (optind < argc) {
732 scanelf_dir(argv[optind++]); 1846 search_path = argv[optind++];
1847 ret = scanelf_dir(search_path);
1848 }
733 1849
734 /* clean up */ 1850 /* clean up */
735 if (find_sym) {
736 free(find_sym);
737 free(versioned_symname); 1851 free(versioned_symname);
1852 for (i = 0; ldpaths[i]; ++i)
1853 free(ldpaths[i]);
1854
1855 if (ldcache != 0)
1856 munmap(ldcache, ldcache_size);
1857 return ret;
1858}
1859
1860static char **get_split_env(const char *envvar)
1861{
1862 const char *delims = " \t\n";
1863 char **envvals = NULL;
1864 char *env, *s;
1865 int nentry;
1866
1867 if ((env = getenv(envvar)) == NULL)
1868 return NULL;
1869
1870 env = xstrdup(env);
1871 if (env == NULL)
1872 return NULL;
1873
1874 s = strtok(env, delims);
1875 if (s == NULL) {
1876 free(env);
1877 return NULL;
738 } 1878 }
739 if (out_format) free(out_format); 1879
1880 nentry = 0;
1881 while (s != NULL) {
1882 ++nentry;
1883 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1884 envvals[nentry-1] = s;
1885 s = strtok(NULL, delims);
1886 }
1887 envvals[nentry] = NULL;
1888
1889 /* don't want to free(env) as it contains the memory that backs
1890 * the envvals array of strings */
1891 return envvals;
1892}
1893static void parseenv()
1894{
1895 qa_textrels = get_split_env("QA_TEXTRELS");
1896 qa_execstack = get_split_env("QA_EXECSTACK");
1897 qa_wx_load = get_split_env("QA_WX_LOAD");
1898}
1899
1900#ifdef __PAX_UTILS_CLEANUP
1901static void cleanup()
1902{
1903 free(out_format);
1904 free(qa_textrels);
1905 free(qa_execstack);
1906 free(qa_wx_load);
1907}
1908#endif
1909
1910
1911int main(int argc, char *argv[])
1912{
1913 int ret;
1914 if (argc < 2)
1915 usage(EXIT_FAILURE);
1916 parseenv();
1917 ret = parseargs(argc, argv);
1918 fclose(stdout);
1919#ifdef __PAX_UTILS_CLEANUP
1920 cleanup();
1921 warn("The calls to add/delete heap should be off:\n"
1922 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1923 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1924#endif
1925 return ret;
740} 1926}
741 1927
742 1928
743 1929
744/* utility funcs */ 1930/* utility funcs */
745static char *xstrdup(char *s) 1931static char *xstrdup(const char *s)
746{ 1932{
747 char *ret = strdup(s); 1933 char *ret = strdup(s);
748 if (!ret) err("Could not strdup(): %s", strerror(errno)); 1934 if (!ret) err("Could not strdup(): %s", strerror(errno));
749 return ret; 1935 return ret;
750} 1936}
752{ 1938{
753 void *ret = malloc(size); 1939 void *ret = malloc(size);
754 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 1940 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
755 return ret; 1941 return ret;
756} 1942}
1943static void *xrealloc(void *ptr, size_t size)
1944{
1945 void *ret = realloc(ptr, size);
1946 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
1947 return ret;
1948}
757static void xstrcat(char **dst, const char *src, size_t *curr_len) 1949static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
758{ 1950{
759 long new_len; 1951 size_t new_len;
760 1952
761 new_len = strlen(*dst) + strlen(src); 1953 new_len = strlen(*dst) + strlen(src);
762 if (*curr_len <= new_len) { 1954 if (*curr_len <= new_len) {
763 *curr_len = new_len + (*curr_len / 2); 1955 *curr_len = new_len + (*curr_len / 2);
764 *dst = realloc(*dst, *curr_len); 1956 *dst = realloc(*dst, *curr_len);
765 if (!*dst) 1957 if (!*dst)
766 err("could not realloc %li bytes", (unsigned long)*curr_len); 1958 err("could not realloc() %li bytes", (unsigned long)*curr_len);
767 } 1959 }
768 1960
1961 if (n)
1962 strncat(*dst, src, n);
1963 else
769 strcat(*dst, src); 1964 strcat(*dst, src);
770} 1965}
771static inline void xchrcat(char **dst, const char append, size_t *curr_len) 1966static inline void xchrcat(char **dst, const char append, size_t *curr_len)
772{ 1967{
773 static char my_app[2]; 1968 static char my_app[2];
774 my_app[0] = append; 1969 my_app[0] = append;
775 my_app[1] = '\0'; 1970 my_app[1] = '\0';
776 xstrcat(dst, my_app, curr_len); 1971 xstrcat(dst, my_app, curr_len);
777} 1972}
778static int xemptybuffer(const char *buff) 1973
1974/* Match filename against entries in matchlist, return TRUE
1975 * if the file is listed */
1976static int file_matches_list(const char *filename, char **matchlist)
779{ 1977{
780 long i; 1978 char **file;
781 for (i=0; buff[i]; ++i) 1979 char *match;
782 if (buff[i] != ' ') 1980 char buf[__PAX_UTILS_PATH_MAX];
1981
1982 if (matchlist == NULL)
783 return 0; 1983 return 0;
1984
1985 for (file = matchlist; *file != NULL; file++) {
1986 if (search_path) {
1987 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
1988 match = buf;
1989 } else {
1990 match = *file;
1991 }
1992 if (fnmatch(match, filename, 0) == 0)
784 return 1; 1993 return 1;
1994 }
1995 return 0;
785} 1996}
786
787
788
789int main(int argc, char *argv[])
790{
791 if (argc < 2)
792 usage(EXIT_FAILURE);
793 parseargs(argc, argv);
794 fclose(stdout);
795 return EXIT_SUCCESS;
796}

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