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Revision 1.44 Revision 1.171
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 1.171 2007/01/09 23:01:09 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 1.171 2007/01/09 23:01:09 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 memset(fullpath, 0x0, sizeof(fullpath));
86
87 path = getenv("PATH");
88
89 if (!path)
90 return NULL;
91
92 path = xstrdup(path);
93 while ((p = strrchr(path, ':')) != NULL) {
94 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
95 *p = 0;
96 if (access(fullpath, R_OK) != (-1)) {
97 free(path);
98 return (char *) fullpath;
99 }
100 }
101 free(path);
102 return NULL;
103}
75 104
76/* sub-funcs for scanelf_file() */ 105/* sub-funcs for scanelf_file() */
106static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
107{
108 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
109#define GET_SYMTABS(B) \
110 if (elf->elf_class == ELFCLASS ## B) { \
111 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
112 /* debug sections */ \
113 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
114 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
115 /* runtime sections */ \
116 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
117 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
118 if (symtab && dynsym) { \
119 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
120 } else { \
121 *sym = (void*)(symtab ? symtab : dynsym); \
122 } \
123 if (strtab && dynstr) { \
124 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
125 } else { \
126 *tab = (void*)(strtab ? strtab : dynstr); \
127 } \
128 }
129 GET_SYMTABS(32)
130 GET_SYMTABS(64)
131}
132
77static char *scanelf_file_pax(elfobj *elf, char *found_pax) 133static char *scanelf_file_pax(elfobj *elf, char *found_pax)
78{ 134{
79 static char *paxflags; 135 static char ret[7];
136 unsigned long i, shown;
80 137
81 if (!show_pax) return NULL; 138 if (!show_pax) return NULL;
82 139
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; 140 shown = 0;
100 strcpy(ret, "--- ---"); 141 memset(&ret, 0, sizeof(ret));
101 142
102 if (elf->phdr) { 143 if (elf->phdr) {
103#define SHOW_STACK(B) \ 144#define SHOW_PAX(B) \
104 if (elf->elf_class == ELFCLASS ## B) { \ 145 if (elf->elf_class == ELFCLASS ## B) { \
105 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 146 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
106 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 147 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
107 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 148 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
108 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 149 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; \ 150 continue; \
116 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ 151 if (fix_elf && setpax) { \
152 /* set the paxctl flags */ \
153 ESET(phdr[i].p_flags, setpax); \
154 } \
155 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
117 continue; \ 156 continue; \
118 memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \ 157 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
119 *found = 1; \ 158 *found_pax = 1; \
120 ++shown; \ 159 ++shown; \
160 break; \
121 } \ 161 } \
122 } 162 }
123 SHOW_STACK(32) 163 SHOW_PAX(32)
124 SHOW_STACK(64) 164 SHOW_PAX(64)
165 }
166
167
168 if (fix_elf && setpax) {
169 /* set the chpax settings */
170 if (elf->elf_class == ELFCLASS32) {
171 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
172 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
173 } else {
174 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
175 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
125 } 176 }
177 }
126 178
127 if (be_quiet && !shown) 179 /* fall back to EI_PAX if no PT_PAX was found */
180 if (!*ret) {
181 static char *paxflags;
182 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
183 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
184 *found_pax = 1;
185 return (be_wewy_wewy_quiet ? NULL : paxflags);
186 }
187 strncpy(ret, paxflags, sizeof(ret));
188 }
189
190 if (be_wewy_wewy_quiet || (be_quiet && !shown))
128 return NULL; 191 return NULL;
129 else 192 else
130 return ret; 193 return ret;
131} 194}
195
196static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
197{
198 static char ret[12];
199 char *found;
200 unsigned long i, shown, multi_stack, multi_relro, multi_load;
201 int max_pt_load;
202
203 if (!show_phdr) return NULL;
204
205 memcpy(ret, "--- --- ---\0", 12);
206
207 shown = 0;
208 multi_stack = multi_relro = multi_load = 0;
209 max_pt_load = elf_max_pt_load(elf);
210
211#define NOTE_GNU_STACK ".note.GNU-stack"
212#define SHOW_PHDR(B) \
213 if (elf->elf_class == ELFCLASS ## B) { \
214 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
215 Elf ## B ## _Off offset; \
216 uint32_t flags, check_flags; \
217 if (elf->phdr != NULL) { \
218 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
219 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
220 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
221 if (multi_stack++) \
222 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
223 if (file_matches_list(elf->filename, qa_execstack)) \
224 continue; \
225 found = found_phdr; \
226 offset = 0; \
227 check_flags = PF_X; \
228 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
229 if (multi_relro++) \
230 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
231 found = found_relro; \
232 offset = 4; \
233 check_flags = PF_X; \
234 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
235 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
236 if (multi_load++ > max_pt_load) \
237 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
238 if (file_matches_list(elf->filename, qa_wx_load)) \
239 continue; \
240 found = found_load; \
241 offset = 8; \
242 check_flags = PF_W|PF_X; \
243 } else \
244 continue; \
245 flags = EGET(phdr[i].p_flags); \
246 if (be_quiet && ((flags & check_flags) != check_flags)) \
247 continue; \
248 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
249 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
250 ret[3] = ret[7] = '!'; \
251 flags = EGET(phdr[i].p_flags); \
252 } \
253 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
254 *found = 1; \
255 ++shown; \
256 } \
257 } else if (elf->shdr != NULL) { \
258 /* no program headers which means this is prob an object file */ \
259 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
260 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
261 char *str; \
262 if ((void*)strtbl > (void*)elf->data_end) \
263 goto skip_this_shdr##B; \
264 check_flags = SHF_WRITE|SHF_EXECINSTR; \
265 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
266 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
267 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
268 str = elf->data + offset; \
269 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
270 if (!strcmp(str, NOTE_GNU_STACK)) { \
271 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
272 flags = EGET(shdr[i].sh_flags); \
273 if (be_quiet && ((flags & check_flags) != check_flags)) \
274 continue; \
275 ++*found_phdr; \
276 shown = 1; \
277 if (flags & SHF_WRITE) ret[0] = 'W'; \
278 if (flags & SHF_ALLOC) ret[1] = 'A'; \
279 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
280 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
281 break; \
282 } \
283 } \
284 skip_this_shdr##B: \
285 if (!multi_stack) { \
286 if (file_matches_list(elf->filename, qa_execstack)) \
287 return NULL; \
288 *found_phdr = 1; \
289 shown = 1; \
290 memcpy(ret, "!WX", 3); \
291 } \
292 } \
293 }
294 SHOW_PHDR(32)
295 SHOW_PHDR(64)
296
297 if (be_wewy_wewy_quiet || (be_quiet && !shown))
298 return NULL;
299 else
300 return ret;
301}
302
132static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 303static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
133{ 304{
134 static char *ret = "TEXTREL"; 305 static const char *ret = "TEXTREL";
135 unsigned long i; 306 unsigned long i;
136 307
137 if (!show_textrel) return NULL; 308 if (!show_textrel && !show_textrels) return NULL;
309
310 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
138 311
139 if (elf->phdr) { 312 if (elf->phdr) {
140#define SHOW_TEXTREL(B) \ 313#define SHOW_TEXTREL(B) \
141 if (elf->elf_class == ELFCLASS ## B) { \ 314 if (elf->elf_class == ELFCLASS ## B) { \
142 Elf ## B ## _Dyn *dyn; \ 315 Elf ## B ## _Dyn *dyn; \
143 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 316 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
144 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 317 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
145 Elf ## B ## _Off offset; \ 318 Elf ## B ## _Off offset; \
146 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 319 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
147 if (phdr[i].p_type != PT_DYNAMIC) continue; \ 320 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
148 offset = EGET(phdr[i].p_offset); \ 321 offset = EGET(phdr[i].p_offset); \
149 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 322 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
150 dyn = DYN ## B (elf->data + offset); \ 323 dyn = DYN ## B (elf->data + offset); \
151 while (EGET(dyn->d_tag) != DT_NULL) { \ 324 while (EGET(dyn->d_tag) != DT_NULL) { \
152 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 325 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
153 *found_textrel = 1; \ 326 *found_textrel = 1; \
154 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 327 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
155 return ret; \ 328 return (be_wewy_wewy_quiet ? NULL : ret); \
156 } \ 329 } \
157 ++dyn; \ 330 ++dyn; \
158 } \ 331 } \
159 } } 332 } }
160 SHOW_TEXTREL(32) 333 SHOW_TEXTREL(32)
161 SHOW_TEXTREL(64) 334 SHOW_TEXTREL(64)
162 } 335 }
163 336
164 if (be_quiet) 337 if (be_quiet || be_wewy_wewy_quiet)
165 return NULL; 338 return NULL;
166 else 339 else
167 return " - "; 340 return " - ";
168} 341}
342static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
343{
344 unsigned long s, r, rmax;
345 void *symtab_void, *strtab_void, *text_void;
346
347 if (!show_textrels) return NULL;
348
349 /* don't search for TEXTREL's if the ELF doesn't have any */
350 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
351 if (!*found_textrel) return NULL;
352
353 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
354 text_void = elf_findsecbyname(elf, ".text");
355
356 if (symtab_void && strtab_void && text_void && elf->shdr) {
357#define SHOW_TEXTRELS(B) \
358 if (elf->elf_class == ELFCLASS ## B) { \
359 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
360 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
361 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
362 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
363 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
364 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
365 uint ## B ## _t memsz = EGET(text->sh_size); \
366 Elf ## B ## _Rel *rel; \
367 Elf ## B ## _Rela *rela; \
368 /* search the section headers for relocations */ \
369 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
370 uint32_t sh_type = EGET(shdr[s].sh_type); \
371 if (sh_type == SHT_REL) { \
372 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
373 rela = NULL; \
374 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
375 } else if (sh_type == SHT_RELA) { \
376 rel = NULL; \
377 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
378 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
379 } else \
380 continue; \
381 /* now see if any of the relocs are in the .text */ \
382 for (r = 0; r < rmax; ++r) { \
383 unsigned long sym_max; \
384 Elf ## B ## _Addr offset_tmp; \
385 Elf ## B ## _Sym *func; \
386 Elf ## B ## _Sym *sym; \
387 Elf ## B ## _Addr r_offset; \
388 uint ## B ## _t r_info; \
389 if (sh_type == SHT_REL) { \
390 r_offset = EGET(rel[r].r_offset); \
391 r_info = EGET(rel[r].r_info); \
392 } else { \
393 r_offset = EGET(rela[r].r_offset); \
394 r_info = EGET(rela[r].r_info); \
395 } \
396 /* make sure this relocation is inside of the .text */ \
397 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
398 if (be_verbose <= 2) continue; \
399 } else \
400 *found_textrels = 1; \
401 /* locate this relocation symbol name */ \
402 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
403 if ((void*)sym > (void*)elf->data_end) { \
404 warn("%s: corrupt ELF symbol", elf->filename); \
405 continue; \
406 } \
407 sym_max = ELF ## B ## _R_SYM(r_info); \
408 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
409 sym += sym_max; \
410 else \
411 sym = NULL; \
412 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
413 /* show the raw details about this reloc */ \
414 printf(" %s: ", elf->base_filename); \
415 if (sym && sym->st_name) \
416 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
417 else \
418 printf("(memory/data?)"); \
419 printf(" [0x%lX]", (unsigned long)r_offset); \
420 /* now try to find the closest symbol that this rel is probably in */ \
421 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
422 func = NULL; \
423 offset_tmp = 0; \
424 while (sym_max--) { \
425 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
426 func = sym; \
427 offset_tmp = EGET(sym->st_value); \
428 } \
429 ++sym; \
430 } \
431 printf(" in "); \
432 if (func && func->st_name) { \
433 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
434 if (r_offset > EGET(func->st_size)) \
435 printf("(optimized out: previous %s)", func_name); \
436 else \
437 printf("%s", func_name); \
438 } else \
439 printf("(optimized out)"); \
440 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
441 if (be_verbose && has_objdump) { \
442 char *sysbuf; \
443 size_t syslen; \
444 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"; \
445 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
446 sysbuf = xmalloc(syslen); \
447 if (sysbuf) { \
448 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
449 if (end_addr < r_offset) \
450 /* not uncommon when things are optimized out */ \
451 end_addr = r_offset + 0x100; \
452 snprintf(sysbuf, syslen, sysfmt, \
453 (unsigned long)offset_tmp, \
454 (unsigned long)end_addr, \
455 elf->filename, \
456 (unsigned long)r_offset); \
457 fflush(stdout); \
458 system(sysbuf); \
459 fflush(stdout); \
460 free(sysbuf); \
461 } \
462 } \
463 } \
464 } }
465 SHOW_TEXTRELS(32)
466 SHOW_TEXTRELS(64)
467 }
468 if (!*found_textrels)
469 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
470
471 return NULL;
472}
473
474static void rpath_security_checks(elfobj *, char *, const char *);
475static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
476{
477 struct stat st;
478 switch (*item) {
479 case '/': break;
480 case '.':
481 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
482 break;
483 case ':':
484 case '\0':
485 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
486 break;
487 case '$':
488 if (fstat(elf->fd, &st) != -1)
489 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
490 warnf("Security problem with %s='%s' in %s with mode set of %o",
491 dt_type, item, elf->filename, st.st_mode & 07777);
492 break;
493 default:
494 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
495 break;
496 }
497}
169static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 498static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
170{ 499{
171 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */
172 unsigned long i; 500 unsigned long i, s;
173 char *rpath, *runpath; 501 char *rpath, *runpath, **r;
174 void *strtbl_void; 502 void *strtbl_void;
175 503
176 if (!show_rpath) return; 504 if (!show_rpath) return;
177 505
178 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 506 strtbl_void = elf_findsecbyname(elf, ".dynstr");
184 Elf ## B ## _Dyn *dyn; \ 512 Elf ## B ## _Dyn *dyn; \
185 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 513 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
186 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 514 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
187 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 515 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
188 Elf ## B ## _Off offset; \ 516 Elf ## B ## _Off offset; \
517 Elf ## B ## _Xword word; \
518 /* Scan all the program headers */ \
189 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 519 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
520 /* Just scan dynamic headers */ \
190 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 521 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
191 offset = EGET(phdr[i].p_offset); \ 522 offset = EGET(phdr[i].p_offset); \
192 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 523 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
524 /* Just scan dynamic RPATH/RUNPATH headers */ \
193 dyn = DYN ## B (elf->data + offset); \ 525 dyn = DYN ## B (elf->data + offset); \
194 while (EGET(dyn->d_tag) != DT_NULL) { \ 526 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
195 if (EGET(dyn->d_tag) == DT_RPATH) { \ 527 if (word == DT_RPATH) { \
196 if (rpath) warn("ELF has multiple DT_RPATH's !?"); \ 528 r = &rpath; \
529 } else if (word == DT_RUNPATH) { \
530 r = &runpath; \
531 } else { \
532 ++dyn; \
533 continue; \
534 } \
535 /* Verify the memory is somewhat sane */ \
197 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 536 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
198 if (offset >= elf->len) continue; \ 537 if (offset < (Elf ## B ## _Off)elf->len) { \
538 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
199 rpath = (char*)(elf->data + offset); \ 539 *r = (char*)(elf->data + offset); \
540 /* cache the length in case we need to nuke this section later on */ \
541 if (fix_elf) \
542 offset = strlen(*r); \
543 /* If quiet, don't output paths in ld.so.conf */ \
544 if (be_quiet) { \
545 size_t len; \
546 char *start, *end; \
547 /* note that we only 'chop' off leading known paths. */ \
548 /* since *r is read-only memory, we can only move the ptr forward. */ \
549 start = *r; \
550 /* scan each path in : delimited list */ \
551 while (start) { \
552 rpath_security_checks(elf, start, get_elfdtype(word)); \
553 end = strchr(start, ':'); \
554 len = (end ? abs(end - start) : strlen(start)); \
555 if (use_ldcache) \
556 for (s = 0; ldpaths[s]; ++s) \
557 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
558 *r = end; \
559 /* corner case ... if RPATH reads "/usr/lib:", we want \
560 * to show ':' rather than '' */ \
561 if (end && end[1] != '\0') \
562 (*r)++; \
563 break; \
564 } \
565 if (!*r || !end) \
566 break; \
567 else \
568 start = start + len + 1; \
569 } \
570 } \
571 if (*r) { \
572 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
573 /* just nuke it */ \
574 nuke_it##B: \
575 memset(*r, 0x00, offset); \
576 *r = NULL; \
577 ESET(dyn->d_tag, DT_DEBUG); \
578 ESET(dyn->d_un.d_ptr, 0); \
579 } else if (fix_elf) { \
580 /* try to clean "bad" paths */ \
581 size_t len, tmpdir_len; \
582 char *start, *end; \
583 const char *tmpdir; \
584 start = *r; \
585 tmpdir = (getenv("TMPDIR") ? : "."); \
586 tmpdir_len = strlen(tmpdir); \
587 while (1) { \
588 end = strchr(start, ':'); \
589 if (start == end) { \
590 eat_this_path##B: \
591 len = strlen(end); \
592 memmove(start, end+1, len); \
593 start[len-1] = '\0'; \
594 end = start - 1; \
595 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
596 if (!end) { \
597 if (start == *r) \
598 goto nuke_it##B; \
599 *--start = '\0'; \
600 } else \
601 goto eat_this_path##B; \
602 } \
603 if (!end) \
604 break; \
605 start = end + 1; \
606 } \
607 if (**r == '\0') \
608 goto nuke_it##B; \
609 } \
610 if (*r) \
200 *found_rpath = 1; \ 611 *found_rpath = 1; \
201 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \ 612 } \
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 } \ 613 } \
208 ++dyn; \ 614 ++dyn; \
209 } \ 615 } \
210 } } 616 } }
211 SHOW_RPATH(32) 617 SHOW_RPATH(32)
212 SHOW_RPATH(64) 618 SHOW_RPATH(64)
213 } 619 }
620
621 if (be_wewy_wewy_quiet) return;
214 622
215 if (rpath && runpath) { 623 if (rpath && runpath) {
216 if (!strcmp(rpath, runpath)) { 624 if (!strcmp(rpath, runpath)) {
217 xstrcat(ret, runpath, ret_len); 625 xstrcat(ret, runpath, ret_len);
218 } else { 626 } else {
226 } else if (rpath || runpath) 634 } else if (rpath || runpath)
227 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 635 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
228 else if (!be_quiet) 636 else if (!be_quiet)
229 xstrcat(ret, " - ", ret_len); 637 xstrcat(ret, " - ", ret_len);
230} 638}
639
640#define LDSO_CACHE_MAGIC "ld.so-"
641#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
642#define LDSO_CACHE_VER "1.7.0"
643#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
644#define FLAG_ANY -1
645#define FLAG_TYPE_MASK 0x00ff
646#define FLAG_LIBC4 0x0000
647#define FLAG_ELF 0x0001
648#define FLAG_ELF_LIBC5 0x0002
649#define FLAG_ELF_LIBC6 0x0003
650#define FLAG_REQUIRED_MASK 0xff00
651#define FLAG_SPARC_LIB64 0x0100
652#define FLAG_IA64_LIB64 0x0200
653#define FLAG_X8664_LIB64 0x0300
654#define FLAG_S390_LIB64 0x0400
655#define FLAG_POWERPC_LIB64 0x0500
656#define FLAG_MIPS64_LIBN32 0x0600
657#define FLAG_MIPS64_LIBN64 0x0700
658
659static char *lookup_cache_lib(elfobj *, char *);
660
661#if defined(__GLIBC__) || defined(__UCLIBC__)
662
663static char *lookup_cache_lib(elfobj *elf, char *fname)
664{
665 int fd = 0;
666 char *strs;
667 static char buf[__PAX_UTILS_PATH_MAX] = "";
668 const char *cachefile = "/etc/ld.so.cache";
669 struct stat st;
670
671 typedef struct {
672 char magic[LDSO_CACHE_MAGIC_LEN];
673 char version[LDSO_CACHE_VER_LEN];
674 int nlibs;
675 } header_t;
676 header_t *header;
677
678 typedef struct {
679 int flags;
680 int sooffset;
681 int liboffset;
682 } libentry_t;
683 libentry_t *libent;
684
685 if (fname == NULL)
686 return NULL;
687
688 if (ldcache == 0) {
689 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
690 return NULL;
691
692 /* cache these values so we only map/unmap the cache file once */
693 ldcache_size = st.st_size;
694 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
695
696 close(fd);
697
698 if (ldcache == (caddr_t)-1) {
699 ldcache = 0;
700 return NULL;
701 }
702
703 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
704 return NULL;
705 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
706 return NULL;
707 }
708
709 header = (header_t *) ldcache;
710 libent = (libentry_t *) (ldcache + sizeof(header_t));
711 strs = (char *) &libent[header->nlibs];
712
713 for (fd = 0; fd < header->nlibs; fd++) {
714 /* this should be more fine grained, but for now we assume that
715 * diff arches will not be cached together. and we ignore the
716 * the different multilib mips cases. */
717 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
718 continue;
719 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
720 continue;
721
722 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
723 continue;
724 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
725 }
726 return buf;
727}
728#elif defined(__NetBSD__)
729static char *lookup_cache_lib(elfobj *elf, char *fname)
730{
731 static char buf[__PAX_UTILS_PATH_MAX] = "";
732 static struct stat st;
733
734 char **ldpath;
735 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
736 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
737 continue; /* if the pathname is too long, or something went wrong, ignore */
738
739 if (stat(buf, &st) != 0)
740 continue; /* if the lib doesn't exist in *ldpath, look further */
741
742 /* NetBSD doesn't actually do sanity checks, it just loads the file
743 * and if that doesn't work, continues looking in other directories.
744 * This cannot easily be safely emulated, unfortunately. For now,
745 * just assume that if it exists, it's a valid library. */
746
747 return buf;
748 }
749
750 /* not found in any path */
751 return NULL;
752}
753#else
754#warning Cache support not implemented for your target
755static char *lookup_cache_lib(elfobj *elf, char *fname)
756{
757 return NULL;
758}
759#endif
760
231static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len) 761static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
232{ 762{
233 unsigned long i; 763 unsigned long i;
234 char *needed; 764 char *needed;
235 void *strtbl_void; 765 void *strtbl_void;
766 char *p;
236 767
237 if (!show_needed) return; 768 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
238 769
239 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 770 strtbl_void = elf_findsecbyname(elf, ".dynstr");
240 771
241 if (elf->phdr && strtbl_void) { 772 if (elf->phdr && strtbl_void) {
242#define SHOW_NEEDED(B) \ 773#define SHOW_NEEDED(B) \
252 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 783 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
253 dyn = DYN ## B (elf->data + offset); \ 784 dyn = DYN ## B (elf->data + offset); \
254 while (EGET(dyn->d_tag) != DT_NULL) { \ 785 while (EGET(dyn->d_tag) != DT_NULL) { \
255 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 786 if (EGET(dyn->d_tag) == DT_NEEDED) { \
256 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 787 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
257 if (offset >= elf->len) continue; \ 788 if (offset >= (Elf ## B ## _Off)elf->len) { \
789 ++dyn; \
790 continue; \
791 } \
258 needed = (char*)(elf->data + offset); \ 792 needed = (char*)(elf->data + offset); \
793 if (op == 0) { \
794 if (!be_wewy_wewy_quiet) { \
259 if (*found_needed) xchrcat(ret, ',', ret_len); \ 795 if (*found_needed) xchrcat(ret, ',', ret_len); \
796 if (use_ldcache) \
797 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
798 needed = p; \
260 xstrcat(ret, needed, ret_len); \ 799 xstrcat(ret, needed, ret_len); \
800 } \
261 *found_needed = 1; \ 801 *found_needed = 1; \
802 } else { \
803 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
804 *found_lib = 1; \
805 return (be_wewy_wewy_quiet ? NULL : needed); \
806 } \
807 } \
262 } \ 808 } \
263 ++dyn; \ 809 ++dyn; \
264 } \ 810 } \
265 } } 811 } }
266 SHOW_NEEDED(32) 812 SHOW_NEEDED(32)
267 SHOW_NEEDED(64) 813 SHOW_NEEDED(64)
814 if (op == 0 && !*found_needed && be_verbose)
815 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
268 } 816 }
817
818 return NULL;
269} 819}
270static char *scanelf_file_interp(elfobj *elf, char *found_interp) 820static char *scanelf_file_interp(elfobj *elf, char *found_interp)
271{ 821{
272 void *strtbl_void; 822 void *strtbl_void;
273 823
278 if (strtbl_void) { 828 if (strtbl_void) {
279#define SHOW_INTERP(B) \ 829#define SHOW_INTERP(B) \
280 if (elf->elf_class == ELFCLASS ## B) { \ 830 if (elf->elf_class == ELFCLASS ## B) { \
281 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 831 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
282 *found_interp = 1; \ 832 *found_interp = 1; \
283 return elf->data + EGET(strtbl->sh_offset); \ 833 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
284 } 834 }
285 SHOW_INTERP(32) 835 SHOW_INTERP(32)
286 SHOW_INTERP(64) 836 SHOW_INTERP(64)
287 } 837 }
288 return NULL; 838 return NULL;
289} 839}
290static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename) 840static char *scanelf_file_bind(elfobj *elf, char *found_bind)
291{ 841{
292 unsigned long i; 842 unsigned long i;
843 struct stat s;
844 char dynamic = 0;
845
846 if (!show_bind) return NULL;
847 if (!elf->phdr) return NULL;
848
849#define SHOW_BIND(B) \
850 if (elf->elf_class == ELFCLASS ## B) { \
851 Elf ## B ## _Dyn *dyn; \
852 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
853 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
854 Elf ## B ## _Off offset; \
855 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
856 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
857 dynamic = 1; \
858 offset = EGET(phdr[i].p_offset); \
859 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
860 dyn = DYN ## B (elf->data + offset); \
861 while (EGET(dyn->d_tag) != DT_NULL) { \
862 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
863 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
864 { \
865 if (be_quiet) return NULL; \
866 *found_bind = 1; \
867 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
868 } \
869 ++dyn; \
870 } \
871 } \
872 }
873 SHOW_BIND(32)
874 SHOW_BIND(64)
875
876 if (be_wewy_wewy_quiet) return NULL;
877
878 /* don't output anything if quiet mode and the ELF is static or not setuid */
879 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
880 return NULL;
881 } else {
882 *found_bind = 1;
883 return (char *) (dynamic ? "LAZY" : "STATIC");
884 }
885}
886static char *scanelf_file_soname(elfobj *elf, char *found_soname)
887{
888 unsigned long i;
889 char *soname;
890 void *strtbl_void;
891
892 if (!show_soname) return NULL;
893
894 strtbl_void = elf_findsecbyname(elf, ".dynstr");
895
896 if (elf->phdr && strtbl_void) {
897#define SHOW_SONAME(B) \
898 if (elf->elf_class == ELFCLASS ## B) { \
899 Elf ## B ## _Dyn *dyn; \
900 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
901 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
902 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
903 Elf ## B ## _Off offset; \
904 /* only look for soname in shared objects */ \
905 if (ehdr->e_type != ET_DYN) \
906 return NULL; \
907 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
908 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
909 offset = EGET(phdr[i].p_offset); \
910 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
911 dyn = DYN ## B (elf->data + offset); \
912 while (EGET(dyn->d_tag) != DT_NULL) { \
913 if (EGET(dyn->d_tag) == DT_SONAME) { \
914 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
915 if (offset >= (Elf ## B ## _Off)elf->len) { \
916 ++dyn; \
917 continue; \
918 } \
919 soname = (char*)(elf->data + offset); \
920 *found_soname = 1; \
921 return (be_wewy_wewy_quiet ? NULL : soname); \
922 } \
923 ++dyn; \
924 } \
925 } }
926 SHOW_SONAME(32)
927 SHOW_SONAME(64)
928 }
929
930 return NULL;
931}
932static char *scanelf_file_sym(elfobj *elf, char *found_sym)
933{
934 unsigned long i;
935 char *ret;
293 void *symtab_void, *strtab_void; 936 void *symtab_void, *strtab_void;
294 937
295 if (!find_sym) return NULL; 938 if (!find_sym) return NULL;
939 ret = find_sym;
296 940
297 symtab_void = elf_findsecbyname(elf, ".symtab"); 941 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
298 strtab_void = elf_findsecbyname(elf, ".strtab");
299 942
300 if (symtab_void && strtab_void) { 943 if (symtab_void && strtab_void) {
301#define FIND_SYM(B) \ 944#define FIND_SYM(B) \
302 if (elf->elf_class == ELFCLASS ## B) { \ 945 if (elf->elf_class == ELFCLASS ## B) { \
303 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 946 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
304 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 947 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
305 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 948 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
306 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 949 unsigned long cnt = EGET(symtab->sh_entsize); \
307 char *symname; \ 950 char *symname; \
951 if (cnt) \
952 cnt = EGET(symtab->sh_size) / cnt; \
308 for (i = 0; i < cnt; ++i) { \ 953 for (i = 0; i < cnt; ++i) { \
309 if (sym->st_name) { \ 954 if (sym->st_name) { \
955 /* make sure the symbol name is in acceptable memory range */ \
310 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 956 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
957 if ((void*)symname > (void*)elf->data_end) { \
958 warnf("%s: corrupt ELF symbols", elf->filename); \
959 ++sym; \
960 continue; \
961 } \
962 /* debug display ... show all symbols and some extra info */ \
311 if (*find_sym == '*') { \ 963 if (*ret == '*') { \
312 printf("%s(%s) %5lX %15s %s\n", \ 964 printf("%s(%s) %5lX %15s %s\n", \
313 ((*found_sym == 0) ? "\n\t" : "\t"), \ 965 ((*found_sym == 0) ? "\n\t" : "\t"), \
314 (char *)basename(filename), \ 966 elf->base_filename, \
315 (long)sym->st_size, \ 967 (unsigned long)sym->st_size, \
316 (char *)get_elfstttype(sym->st_info), \ 968 get_elfstttype(sym->st_info), \
317 symname); \ 969 symname); \
318 *found_sym = 1; \ 970 *found_sym = 1; \
319 } else if ((strcmp(find_sym, symname) == 0) || \ 971 } else { \
320 (strcmp(symname, versioned_symname) == 0)) \ 972 /* allow the user to specify a comma delimited list of symbols to search for */ \
973 char *this_sym, *this_sym_ver, *next_sym; \
974 this_sym = ret; \
975 this_sym_ver = versioned_symname; \
976 do { \
977 next_sym = strchr(this_sym, ','); \
978 if (next_sym == NULL) \
979 next_sym = this_sym + strlen(this_sym); \
980 /* do we want a defined symbol ? */ \
981 if (*this_sym == '+') { \
982 if (sym->st_shndx == SHN_UNDEF) \
983 goto skip_this_sym##B; \
984 ++this_sym; \
985 ++this_sym_ver; \
986 /* do we want an undefined symbol ? */ \
987 } else if (*this_sym == '-') { \
988 if (sym->st_shndx != SHN_UNDEF) \
989 goto skip_this_sym##B; \
990 ++this_sym; \
991 ++this_sym_ver; \
992 } \
993 /* ok, lets compare the name now */ \
994 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
995 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
996 if (be_semi_verbose) { \
997 char buf[126]; \
998 snprintf(buf, sizeof(buf), "%lX %s %s", \
999 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
1000 ret = buf; \
1001 } else \
1002 ret = this_sym; \
321 (*found_sym)++; \ 1003 (*found_sym)++; \
1004 goto break_out; \
1005 } \
1006 skip_this_sym##B: this_sym = next_sym + 1; \
1007 } while (*next_sym != '\0'); \
1008 } \
322 } \ 1009 } \
323 ++sym; \ 1010 ++sym; \
324 } } 1011 } }
325 FIND_SYM(32) 1012 FIND_SYM(32)
326 FIND_SYM(64) 1013 FIND_SYM(64)
327 } 1014 }
1015
1016break_out:
1017 if (be_wewy_wewy_quiet) return NULL;
1018
328 if (*find_sym != '*' && *found_sym) 1019 if (*find_sym != '*' && *found_sym)
329 return find_sym; 1020 return ret;
330 if (be_quiet) 1021 if (be_quiet)
331 return NULL; 1022 return NULL;
332 else 1023 else
333 return " - "; 1024 return (char *)" - ";
334} 1025}
1026
1027
1028static char *scanelf_file_sections(elfobj *elf, char *found_section)
1029{
1030 if (!find_section)
1031 return NULL;
1032
1033#define FIND_SECTION(B) \
1034 if (elf->elf_class == ELFCLASS ## B) { \
1035 int invert; \
1036 Elf ## B ## _Shdr *section; \
1037 invert = (*find_section == '!' ? 1 : 0); \
1038 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1039 if ((section == NULL && invert) || (section != NULL && !invert)) \
1040 *found_section = 1; \
1041 }
1042 FIND_SECTION(32)
1043 FIND_SECTION(64)
1044
1045 if (be_wewy_wewy_quiet)
1046 return NULL;
1047
1048 if (*found_section)
1049 return find_section;
1050
1051 if (be_quiet)
1052 return NULL;
1053 else
1054 return (char *)" - ";
1055}
1056
335/* scan an elf file and show all the fun stuff */ 1057/* scan an elf file and show all the fun stuff */
336#define prints(str) fputs(str, stdout) 1058#define prints(str) write(fileno(stdout), str, strlen(str))
337static void scanelf_file(const char *filename) 1059static int scanelf_elfobj(elfobj *elf)
338{ 1060{
339 unsigned long i; 1061 unsigned long i;
340 char found_pax, found_stack, found_relro, found_textrel, 1062 char found_pax, found_phdr, found_relro, found_load, found_textrel,
341 found_rpath, found_needed, found_interp, found_sym, 1063 found_rpath, found_needed, found_interp, found_bind, found_soname,
342 found_file; 1064 found_sym, found_lib, found_file, found_textrels, found_section;
343 elfobj *elf;
344 struct stat st;
345 static char *out_buffer = NULL; 1065 static char *out_buffer = NULL;
346 static size_t out_len; 1066 static size_t out_len;
347 1067
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 = \ 1068 found_pax = found_phdr = found_relro = found_load = found_textrel = \
360 found_rpath = found_needed = found_interp = found_sym = \ 1069 found_rpath = found_needed = found_interp = found_bind = found_soname = \
361 found_file = 0; 1070 found_sym = found_lib = found_file = found_textrels = found_section = 0;
362 1071
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) 1072 if (be_verbose > 2)
370 printf("%s: scanning file {%s,%s}\n", filename, 1073 printf("%s: scanning file {%s,%s}\n", elf->filename,
371 get_elfeitype(elf, EI_CLASS, elf->elf_class), 1074 get_elfeitype(EI_CLASS, elf->elf_class),
372 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA])); 1075 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
373 else if (be_verbose) 1076 else if (be_verbose > 1)
374 printf("%s: scanning file\n", filename); 1077 printf("%s: scanning file\n", elf->filename);
375 1078
376 /* init output buffer */ 1079 /* init output buffer */
377 if (!out_buffer) { 1080 if (!out_buffer) {
378 out_len = sizeof(char) * 80; 1081 out_len = sizeof(char) * 80;
379 out_buffer = (char*)xmalloc(out_len); 1082 out_buffer = (char*)xmalloc(out_len);
380 } 1083 }
381 *out_buffer = '\0'; 1084 *out_buffer = '\0';
382 1085
383 /* show the header */ 1086 /* show the header */
384 if (!be_quiet && show_banner) { 1087 if (!be_quiet && show_banner) {
385 for (i=0; out_format[i]; ++i) { 1088 for (i = 0; out_format[i]; ++i) {
386 if (out_format[i] != '%') continue; 1089 if (!IS_MODIFIER(out_format[i])) continue;
387 1090
388 switch (out_format[++i]) { 1091 switch (out_format[++i]) {
1092 case '+': break;
389 case '%': break; 1093 case '%': break;
1094 case '#': break;
1095 case 'F':
1096 case 'p':
390 case 'F': prints("FILE "); break; 1097 case 'f': prints("FILE "); found_file = 1; break;
391 case 'o': prints(" TYPE "); break; 1098 case 'o': prints(" TYPE "); break;
392 case 'x': prints(" PAX "); break; 1099 case 'x': prints(" PAX "); break;
393 case 'e': prints("STK/REL "); break; 1100 case 'e': prints("STK/REL/PTL "); break;
394 case 't': prints("TEXTREL "); break; 1101 case 't': prints("TEXTREL "); break;
395 case 'r': prints("RPATH "); break; 1102 case 'r': prints("RPATH "); break;
1103 case 'M': prints("CLASS "); break;
396 case 'n': prints("NEEDED "); break; 1104 case 'n': prints("NEEDED "); break;
397 case 'i': prints("INTERP "); break; 1105 case 'i': prints("INTERP "); break;
1106 case 'b': prints("BIND "); break;
1107 case 'S': prints("SONAME "); break;
398 case 's': prints("SYM "); break; 1108 case 's': prints("SYM "); break;
1109 case 'N': prints("LIB "); break;
1110 case 'T': prints("TEXTRELS "); break;
1111 case 'k': prints("SECTION "); break;
1112 case 'a': prints("ARCH "); break;
1113 default: warnf("'%c' has no title ?", out_format[i]);
399 } 1114 }
400 } 1115 }
1116 if (!found_file) prints("FILE ");
401 prints("\n"); 1117 prints("\n");
1118 found_file = 0;
402 show_banner = 0; 1119 show_banner = 0;
403 } 1120 }
404 1121
405 /* dump all the good stuff */ 1122 /* dump all the good stuff */
406 for (i=0; out_format[i]; ++i) { 1123 for (i = 0; out_format[i]; ++i) {
407 const char *out; 1124 const char *out;
1125 const char *tmp;
408 1126
409 /* make sure we trim leading spaces in quiet mode */ 1127 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); 1128 xchrcat(&out_buffer, out_format[i], &out_len);
415 continue; 1129 continue;
416 } 1130 }
417 1131
418 out = NULL; 1132 out = NULL;
1133 be_wewy_wewy_quiet = (out_format[i] == '#');
1134 be_semi_verbose = (out_format[i] == '+');
419 switch (out_format[++i]) { 1135 switch (out_format[++i]) {
1136 case '+':
1137 case '%':
1138 case '#':
420 case '%': xchrcat(&out_buffer, '%', &out_len); break; 1139 xchrcat(&out_buffer, out_format[i], &out_len); break;
421 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break; 1140 case 'F':
1141 found_file = 1;
1142 if (be_wewy_wewy_quiet) break;
1143 xstrcat(&out_buffer, elf->filename, &out_len);
1144 break;
1145 case 'p':
1146 found_file = 1;
1147 if (be_wewy_wewy_quiet) break;
1148 tmp = elf->filename;
1149 if (search_path) {
1150 ssize_t len_search = strlen(search_path);
1151 ssize_t len_file = strlen(elf->filename);
1152 if (!strncmp(elf->filename, search_path, len_search) && \
1153 len_file > len_search)
1154 tmp += len_search;
1155 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1156 }
1157 xstrcat(&out_buffer, tmp, &out_len);
1158 break;
1159 case 'f':
1160 found_file = 1;
1161 if (be_wewy_wewy_quiet) break;
1162 tmp = strrchr(elf->filename, '/');
1163 tmp = (tmp == NULL ? elf->filename : tmp+1);
1164 xstrcat(&out_buffer, tmp, &out_len);
1165 break;
422 case 'o': out = get_elfetype(elf); break; 1166 case 'o': out = get_elfetype(elf); break;
423 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1167 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
424 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break; 1168 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; 1169 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1170 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; 1171 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1172 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1173 case 'n':
427 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break; 1174 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; 1175 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1176 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1177 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
429 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break; 1178 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1179 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1180 case 'a': out = get_elfemtype(elf); break;
1181 default: warnf("'%c' has no scan code?", out_format[i]);
430 } 1182 }
1183 if (out) {
1184 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1185 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1186 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1187 else
431 if (out) xstrcat(&out_buffer, out, &out_len); 1188 xstrcat(&out_buffer, out, &out_len);
432 } 1189 }
1190 }
433 1191
434 if (!found_file) { 1192#define FOUND_SOMETHING() \
435 if (!be_quiet || found_pax || found_stack || found_textrel || \ 1193 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
436 found_rpath || found_needed || found_interp || found_sym) 1194 found_rpath || found_needed || found_interp || found_bind || \
1195 found_soname || found_sym || found_lib || found_textrels || found_section )
1196
1197 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1198 xchrcat(&out_buffer, ' ', &out_len);
437 xstrcat(&out_buffer, filename, &out_len); 1199 xstrcat(&out_buffer, elf->filename, &out_len);
438 } 1200 }
439 if (!(be_quiet && xemptybuffer(out_buffer))) 1201 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
440 puts(out_buffer); 1202 puts(out_buffer);
1203 fflush(stdout);
1204 }
441 1205
1206 return 0;
1207}
1208
1209/* scan a single elf */
1210static int scanelf_elf(const char *filename, int fd, size_t len)
1211{
1212 int ret = 1;
1213 elfobj *elf;
1214
1215 /* verify this is real ELF */
1216 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1217 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1218 return ret;
1219 }
1220 switch (match_bits) {
1221 case 32:
1222 if (elf->elf_class != ELFCLASS32)
1223 goto label_done;
1224 break;
1225 case 64:
1226 if (elf->elf_class != ELFCLASS64)
1227 goto label_done;
1228 break;
1229 default: break;
1230 }
1231 if (strlen(match_etypes)) {
1232 char sbuf[126];
1233 strncpy(sbuf, match_etypes, sizeof(sbuf));
1234 if (strchr(match_etypes, ',') != NULL) {
1235 char *p;
1236 while((p = strrchr(sbuf, ',')) != NULL) {
1237 *p = 0;
1238 if (etype_lookup(p+1) == get_etype(elf))
1239 goto label_ret;
1240 }
1241 }
1242 if (etype_lookup(sbuf) != get_etype(elf))
1243 goto label_done;
1244 }
1245
1246label_ret:
1247 ret = scanelf_elfobj(elf);
1248
1249label_done:
442 unreadelf(elf); 1250 unreadelf(elf);
1251 return ret;
1252}
1253
1254/* scan an archive of elfs */
1255static int scanelf_archive(const char *filename, int fd, size_t len)
1256{
1257 archive_handle *ar;
1258 archive_member *m;
1259 char *ar_buffer;
1260 elfobj *elf;
1261
1262 ar = ar_open_fd(filename, fd);
1263 if (ar == NULL)
1264 return 1;
1265
1266 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1267 while ((m=ar_next(ar)) != NULL) {
1268 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1269 if (elf) {
1270 scanelf_elfobj(elf);
1271 unreadelf(elf);
1272 }
1273 }
1274 munmap(ar_buffer, len);
1275
1276 return 0;
1277}
1278/* scan a file which may be an elf or an archive or some other magical beast */
1279static int scanelf_file(const char *filename, const struct stat *st_cache)
1280{
1281 const struct stat *st = st_cache;
1282 struct stat symlink_st;
1283 int fd;
1284
1285 /* always handle regular files and handle symlinked files if no -y */
1286 if (S_ISLNK(st->st_mode)) {
1287 if (!scan_symlink) return 1;
1288 stat(filename, &symlink_st);
1289 st = &symlink_st;
1290 }
1291
1292 if (!S_ISREG(st->st_mode)) {
1293 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1294 return 1;
1295 }
1296
1297 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1298 return 1;
1299
1300 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1301 /* if it isn't an ELF, maybe it's an .a archive */
1302 scanelf_archive(filename, fd, st->st_size);
1303
1304 close(fd);
1305 return 0;
443} 1306}
444 1307
445/* scan a directory for ET_EXEC files and print when we find one */ 1308/* scan a directory for ET_EXEC files and print when we find one */
446static void scanelf_dir(const char *path) 1309static int scanelf_dir(const char *path)
447{ 1310{
448 register DIR *dir; 1311 register DIR *dir;
449 register struct dirent *dentry; 1312 register struct dirent *dentry;
450 struct stat st_top, st; 1313 struct stat st_top, st;
451 char buf[_POSIX_PATH_MAX]; 1314 char buf[__PAX_UTILS_PATH_MAX];
452 size_t pathlen = 0, len = 0; 1315 size_t pathlen = 0, len = 0;
1316 int ret = 0;
453 1317
454 /* make sure path exists */ 1318 /* make sure path exists */
455 if (lstat(path, &st_top) == -1) { 1319 if (lstat(path, &st_top) == -1) {
456 if (be_verbose > 2) printf("%s: does not exist\n", path); 1320 if (be_verbose > 2) printf("%s: does not exist\n", path);
457 return; 1321 return 1;
458 } 1322 }
459 1323
460 /* ok, if it isn't a directory, assume we can open it */ 1324 /* ok, if it isn't a directory, assume we can open it */
461 if (!S_ISDIR(st_top.st_mode)) { 1325 if (!S_ISDIR(st_top.st_mode)) {
462 scanelf_file(path); 1326 return scanelf_file(path, &st_top);
463 return;
464 } 1327 }
465 1328
466 /* now scan the dir looking for fun stuff */ 1329 /* now scan the dir looking for fun stuff */
467 if ((dir = opendir(path)) == NULL) { 1330 if ((dir = opendir(path)) == NULL) {
468 warnf("could not opendir %s: %s", path, strerror(errno)); 1331 warnf("could not opendir %s: %s", path, strerror(errno));
469 return; 1332 return 1;
470 } 1333 }
471 if (be_verbose) printf("%s: scanning dir\n", path); 1334 if (be_verbose > 1) printf("%s: scanning dir\n", path);
472 1335
473 pathlen = strlen(path); 1336 pathlen = strlen(path);
474 while ((dentry = readdir(dir))) { 1337 while ((dentry = readdir(dir))) {
475 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1338 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
476 continue; 1339 continue;
477 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1340 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
478 if (len >= sizeof(buf)) { 1341 if (len >= sizeof(buf)) {
479 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf)); 1342 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1343 (unsigned long)len, (unsigned long)sizeof(buf));
480 continue; 1344 continue;
481 } 1345 }
482 sprintf(buf, "%s/%s", path, dentry->d_name); 1346 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
483 if (lstat(buf, &st) != -1) { 1347 if (lstat(buf, &st) != -1) {
484 if (S_ISREG(st.st_mode)) 1348 if (S_ISREG(st.st_mode))
485 scanelf_file(buf); 1349 ret = scanelf_file(buf, &st);
486 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1350 else if (dir_recurse && S_ISDIR(st.st_mode)) {
487 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1351 if (dir_crossmount || (st_top.st_dev == st.st_dev))
488 scanelf_dir(buf); 1352 ret = scanelf_dir(buf);
489 } 1353 }
490 } 1354 }
491 } 1355 }
492 closedir(dir); 1356 closedir(dir);
1357 return ret;
493} 1358}
1359
1360static int scanelf_from_file(const char *filename)
1361{
1362 FILE *fp = NULL;
1363 char *p;
1364 char path[__PAX_UTILS_PATH_MAX];
1365 int ret = 0;
1366
1367 if (strcmp(filename, "-") == 0)
1368 fp = stdin;
1369 else if ((fp = fopen(filename, "r")) == NULL)
1370 return 1;
1371
1372 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1373 if ((p = strchr(path, '\n')) != NULL)
1374 *p = 0;
1375 search_path = path;
1376 ret = scanelf_dir(path);
1377 }
1378 if (fp != stdin)
1379 fclose(fp);
1380 return ret;
1381}
1382
1383#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1384
1385static int load_ld_cache_config(int i, const char *fname)
1386{
1387 FILE *fp = NULL;
1388 char *p;
1389 char path[__PAX_UTILS_PATH_MAX];
1390
1391 if (i + 1 == ARRAY_SIZE(ldpaths))
1392 return i;
1393
1394 if ((fp = fopen(fname, "r")) == NULL)
1395 return i;
1396
1397 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1398 if ((p = strrchr(path, '\r')) != NULL)
1399 *p = 0;
1400 if ((p = strchr(path, '\n')) != NULL)
1401 *p = 0;
1402#ifdef __linux__
1403 // recursive includes of the same file will make this segfault.
1404 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1405 glob64_t gl;
1406 size_t x;
1407 char gpath[__PAX_UTILS_PATH_MAX];
1408
1409 memset(gpath, 0, sizeof(gpath));
1410
1411 if (path[8] != '/')
1412 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1413 else
1414 strncpy(gpath, &path[8], sizeof(gpath));
1415
1416 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1417 for (x = 0; x < gl.gl_pathc; ++x) {
1418 /* try to avoid direct loops */
1419 if (strcmp(gl.gl_pathv[x], fname) == 0)
1420 continue;
1421 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1422 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1423 globfree64(&gl);
1424 return i;
1425 }
1426 }
1427 globfree64 (&gl);
1428 continue;
1429 }
1430 }
1431#endif
1432 if (*path != '/')
1433 continue;
1434
1435 ldpaths[i++] = xstrdup(path);
1436
1437 if (i + 1 == ARRAY_SIZE(ldpaths))
1438 break;
1439 }
1440 ldpaths[i] = NULL;
1441
1442 fclose(fp);
1443 return i;
1444}
1445
1446#elif defined(__FreeBSD__) || (__DragonFly__)
1447
1448static int load_ld_cache_config(int i, const char *fname)
1449{
1450 FILE *fp = NULL;
1451 char *b = NULL, *p;
1452 struct elfhints_hdr hdr;
1453
1454 if (i + 1 == ARRAY_SIZE(ldpaths))
1455 return i;
1456
1457 if ((fp = fopen(fname, "r")) == NULL)
1458 return i;
1459
1460 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1461 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1462 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1463 {
1464 fclose(fp);
1465 return i;
1466 }
1467
1468 b = (char*)malloc(hdr.dirlistlen+1);
1469 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1470 fclose(fp);
1471 free(b);
1472 return i;
1473 }
1474
1475 while ((p = strsep(&b, ":"))) {
1476 if (*p == '\0') continue;
1477 ldpaths[i++] = xstrdup(p);
1478
1479 if (i + 1 == ARRAY_SIZE(ldpaths))
1480 break;
1481 }
1482 ldpaths[i] = NULL;
1483
1484 free(b);
1485 fclose(fp);
1486 return i;
1487}
1488
1489#else
1490
1491#warning Cache config support not implemented for your target
1492static int load_ld_cache_config(int i, const char *fname)
1493{
1494 memset(ldpaths, 0x00, sizeof(ldpaths));
1495}
1496
1497#endif
494 1498
495/* scan /etc/ld.so.conf for paths */ 1499/* scan /etc/ld.so.conf for paths */
496static void scanelf_ldpath() 1500static void scanelf_ldpath()
497{ 1501{
498 char scan_l, scan_ul, scan_ull; 1502 char scan_l, scan_ul, scan_ull;
499 char *path, *p; 1503 int i = 0;
500 FILE *fp;
501 1504
502 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1505 if (!ldpaths[0])
503 err("Unable to open ld.so.conf: %s", strerror(errno)); 1506 err("Unable to load any paths from ld.so.conf");
504 1507
505 scan_l = scan_ul = scan_ull = 0; 1508 scan_l = scan_ul = scan_ull = 0;
506 1509
507 path = (char*)xmalloc(_POSIX_PATH_MAX); 1510 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; 1511 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
515 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1; 1512 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
516 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1; 1513 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
517 scanelf_dir(path); 1514 scanelf_dir(ldpaths[i]);
1515 ++i;
518 } 1516 }
519 free(path);
520 fclose(fp);
521 1517
522 if (!scan_l) scanelf_dir("/lib"); 1518 if (!scan_l) scanelf_dir("/lib");
523 if (!scan_ul) scanelf_dir("/usr/lib"); 1519 if (!scan_ul) scanelf_dir("/usr/lib");
524 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1520 if (!scan_ull) scanelf_dir("/usr/local/lib");
525} 1521}
540 } 1536 }
541 1537
542 free(path); 1538 free(path);
543} 1539}
544 1540
545
546
547/* usage / invocation handling functions */ 1541/* usage / invocation handling functions */
548#define PARSE_FLAGS "plRmyxetrnis:aqvF:o:BhV" 1542#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
549#define a_argument required_argument 1543#define a_argument required_argument
550static struct option const long_opts[] = { 1544static struct option const long_opts[] = {
551 {"path", no_argument, NULL, 'p'}, 1545 {"path", no_argument, NULL, 'p'},
552 {"ldpath", no_argument, NULL, 'l'}, 1546 {"ldpath", no_argument, NULL, 'l'},
553 {"recursive", no_argument, NULL, 'R'}, 1547 {"recursive", no_argument, NULL, 'R'},
554 {"mount", no_argument, NULL, 'm'}, 1548 {"mount", no_argument, NULL, 'm'},
555 {"symlink", no_argument, NULL, 'y'}, 1549 {"symlink", no_argument, NULL, 'y'},
1550 {"archives", no_argument, NULL, 'A'},
1551 {"ldcache", no_argument, NULL, 'L'},
1552 {"fix", no_argument, NULL, 'X'},
1553 {"setpax", a_argument, NULL, 'z'},
556 {"pax", no_argument, NULL, 'x'}, 1554 {"pax", no_argument, NULL, 'x'},
557 {"header", no_argument, NULL, 'e'}, 1555 {"header", no_argument, NULL, 'e'},
558 {"textrel", no_argument, NULL, 't'}, 1556 {"textrel", no_argument, NULL, 't'},
559 {"rpath", no_argument, NULL, 'r'}, 1557 {"rpath", no_argument, NULL, 'r'},
560 {"needed", no_argument, NULL, 'n'}, 1558 {"needed", no_argument, NULL, 'n'},
561 {"interp", no_argument, NULL, 'i'}, 1559 {"interp", no_argument, NULL, 'i'},
1560 {"bind", no_argument, NULL, 'b'},
1561 {"soname", no_argument, NULL, 'S'},
562 {"symbol", a_argument, NULL, 's'}, 1562 {"symbol", a_argument, NULL, 's'},
1563 {"section", a_argument, NULL, 'k'},
1564 {"lib", a_argument, NULL, 'N'},
1565 {"gmatch", no_argument, NULL, 'g'},
1566 {"textrels", no_argument, NULL, 'T'},
1567 {"etype", a_argument, NULL, 'E'},
1568 {"bits", a_argument, NULL, 'M'},
563 {"all", no_argument, NULL, 'a'}, 1569 {"all", no_argument, NULL, 'a'},
564 {"quiet", no_argument, NULL, 'q'}, 1570 {"quiet", no_argument, NULL, 'q'},
565 {"verbose", no_argument, NULL, 'v'}, 1571 {"verbose", no_argument, NULL, 'v'},
566 {"format", a_argument, NULL, 'F'}, 1572 {"format", a_argument, NULL, 'F'},
1573 {"from", a_argument, NULL, 'f'},
567 {"file", a_argument, NULL, 'o'}, 1574 {"file", a_argument, NULL, 'o'},
568 {"nobanner", no_argument, NULL, 'B'}, 1575 {"nobanner", no_argument, NULL, 'B'},
569 {"help", no_argument, NULL, 'h'}, 1576 {"help", no_argument, NULL, 'h'},
570 {"version", no_argument, NULL, 'V'}, 1577 {"version", no_argument, NULL, 'V'},
571 {NULL, no_argument, NULL, 0x0} 1578 {NULL, no_argument, NULL, 0x0}
572}; 1579};
1580
573static char *opts_help[] = { 1581static const char *opts_help[] = {
574 "Scan all directories in PATH environment", 1582 "Scan all directories in PATH environment",
575 "Scan all directories in /etc/ld.so.conf", 1583 "Scan all directories in /etc/ld.so.conf",
576 "Scan directories recursively", 1584 "Scan directories recursively",
577 "Don't recursively cross mount points", 1585 "Don't recursively cross mount points",
578 "Don't scan symlinks\n", 1586 "Don't scan symlinks",
1587 "Scan archives (.a files)",
1588 "Utilize ld.so.cache information (use with -r/-n)",
1589 "Try and 'fix' bad things (use with -r/-e)",
1590 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
579 "Print PaX markings", 1591 "Print PaX markings",
580 "Print GNU_STACK markings", 1592 "Print GNU_STACK/PT_LOAD markings",
581 "Print TEXTREL information", 1593 "Print TEXTREL information",
582 "Print RPATH information", 1594 "Print RPATH information",
583 "Print NEEDED information", 1595 "Print NEEDED information",
584 "Print INTERP information", 1596 "Print INTERP information",
1597 "Print BIND information",
1598 "Print SONAME information",
585 "Find a specified symbol", 1599 "Find a specified symbol",
1600 "Find a specified section",
1601 "Find a specified library",
1602 "Use strncmp to match libraries. (use with -N)",
1603 "Locate cause of TEXTREL",
1604 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1605 "Print only ELF files matching numeric bits",
586 "Print all scanned info (-x -e -t -r)\n", 1606 "Print all scanned info (-x -e -t -r -b)\n",
587 "Only output 'bad' things", 1607 "Only output 'bad' things",
588 "Be verbose (can be specified more than once)", 1608 "Be verbose (can be specified more than once)",
589 "Use specified format for output", 1609 "Use specified format for output",
1610 "Read input stream from a filename",
590 "Write output stream to a filename", 1611 "Write output stream to a filename",
591 "Don't display the header", 1612 "Don't display the header",
592 "Print this help and exit", 1613 "Print this help and exit",
593 "Print version and exit", 1614 "Print version and exit",
594 NULL 1615 NULL
596 1617
597/* display usage and exit */ 1618/* display usage and exit */
598static void usage(int status) 1619static void usage(int status)
599{ 1620{
600 unsigned long i; 1621 unsigned long i;
601 printf(" Scan ELF binaries for stuff\n\n" 1622 printf("* Scan ELF binaries for stuff\n\n"
602 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1623 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
603 printf("Options: -[%s]\n", PARSE_FLAGS); 1624 printf("Options: -[%s]\n", PARSE_FLAGS);
604 for (i = 0; long_opts[i].name; ++i) 1625 for (i = 0; long_opts[i].name; ++i)
605 if (long_opts[i].has_arg == no_argument) 1626 if (long_opts[i].has_arg == no_argument)
606 printf(" -%c, --%-13s %s\n", long_opts[i].val, 1627 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
607 long_opts[i].name, opts_help[i]); 1628 long_opts[i].name, opts_help[i]);
608 else 1629 else
609 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val, 1630 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
610 long_opts[i].name, opts_help[i]); 1631 long_opts[i].name, opts_help[i]);
1632
1633 if (status != EXIT_SUCCESS)
1634 exit(status);
1635
1636 puts("\nThe format modifiers for the -F option are:");
1637 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1638 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1639 puts(" i INTERP \tb BIND \ts symbol");
1640 puts(" N library \to Type \tT TEXTRELs");
1641 puts(" S SONAME \tk section \ta arch");
1642 puts(" p filename (with search path removed)");
1643 puts(" f filename (short name/basename)");
1644 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1645
1646 puts("\nELF Etypes:");
1647 print_etypes(stdout);
1648
611 exit(status); 1649 exit(status);
612} 1650}
613 1651
614/* parse command line arguments and preform needed actions */ 1652/* parse command line arguments and preform needed actions */
1653#define do_pax_state(option, flag) \
1654 if (islower(option)) { \
1655 flags &= ~PF_##flag; \
1656 flags |= PF_NO##flag; \
1657 } else { \
1658 flags &= ~PF_NO##flag; \
1659 flags |= PF_##flag; \
1660 }
615static void parseargs(int argc, char *argv[]) 1661static int parseargs(int argc, char *argv[])
616{ 1662{
617 int flag; 1663 int i;
1664 const char *from_file = NULL;
1665 int ret = 0;
618 1666
619 opterr = 0; 1667 opterr = 0;
620 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1668 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
621 switch (flag) { 1669 switch (i) {
622 1670
623 case 'V': 1671 case 'V':
624 printf("%s compiled %s\n%s\n" 1672 printf("pax-utils-%s: %s compiled %s\n%s\n"
625 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 1673 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
626 __FILE__, __DATE__, rcsid, argv0); 1674 VERSION, __FILE__, __DATE__, rcsid, argv0);
627 exit(EXIT_SUCCESS); 1675 exit(EXIT_SUCCESS);
628 break; 1676 break;
629 case 'h': usage(EXIT_SUCCESS); break; 1677 case 'h': usage(EXIT_SUCCESS); break;
630 1678 case 'f':
1679 if (from_file) warn("You prob don't want to specify -f twice");
1680 from_file = optarg;
1681 break;
1682 case 'E':
1683 strncpy(match_etypes, optarg, sizeof(match_etypes));
1684 break;
1685 case 'M':
1686 match_bits = atoi(optarg);
1687 break;
631 case 'o': { 1688 case 'o': {
632 FILE *fp = NULL;
633 fp = freopen(optarg, "w", stdout); 1689 if (freopen(optarg, "w", stdout) == NULL)
634 if (fp == NULL)
635 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1690 err("Could not open output stream '%s': %s", optarg, strerror(errno));
636 stdout = fp;
637 break; 1691 break;
638 } 1692 }
639 1693 case 'k':
1694 if (find_section) warn("You prob don't want to specify -k twice");
1695 find_section = optarg;
1696 break;
640 case 's': { 1697 case 's': {
641 size_t len; 1698 if (find_sym) warn("You prob don't want to specify -s twice");
642 find_sym = xstrdup(optarg); 1699 find_sym = optarg;
643 len = strlen(find_sym) + 1;
644 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1)); 1700 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
645 sprintf(versioned_symname, "%s@", find_sym); 1701 sprintf(versioned_symname, "%s@", find_sym);
646 break; 1702 break;
647 } 1703 }
1704 case 'N': {
1705 if (find_lib) warn("You prob don't want to specify -N twice");
1706 find_lib = optarg;
1707 break;
1708 }
648 1709
649 case 'F': { 1710 case 'F': {
1711 if (out_format) warn("You prob don't want to specify -F twice");
650 out_format = strdup(optarg); 1712 out_format = optarg;
651 break; 1713 break;
652 } 1714 }
1715 case 'z': {
1716 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1717 size_t x;
653 1718
1719 for (x = 0 ; x < strlen(optarg); x++) {
1720 switch(optarg[x]) {
1721 case 'p':
1722 case 'P':
1723 do_pax_state(optarg[x], PAGEEXEC);
1724 break;
1725 case 's':
1726 case 'S':
1727 do_pax_state(optarg[x], SEGMEXEC);
1728 break;
1729 case 'm':
1730 case 'M':
1731 do_pax_state(optarg[x], MPROTECT);
1732 break;
1733 case 'e':
1734 case 'E':
1735 do_pax_state(optarg[x], EMUTRAMP);
1736 break;
1737 case 'r':
1738 case 'R':
1739 do_pax_state(optarg[x], RANDMMAP);
1740 break;
1741 case 'x':
1742 case 'X':
1743 do_pax_state(optarg[x], RANDEXEC);
1744 break;
1745 default:
1746 break;
1747 }
1748 }
1749 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1750 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1751 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1752 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1753 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1754 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1755 setpax = flags;
1756 break;
1757 }
1758 case 'g': gmatch = 1; break;
1759 case 'L': use_ldcache = 1; break;
654 case 'y': scan_symlink = 0; break; 1760 case 'y': scan_symlink = 0; break;
1761 case 'A': scan_archives = 1; break;
655 case 'B': show_banner = 0; break; 1762 case 'B': show_banner = 0; break;
656 case 'l': scan_ldpath = 1; break; 1763 case 'l': scan_ldpath = 1; break;
657 case 'p': scan_envpath = 1; break; 1764 case 'p': scan_envpath = 1; break;
658 case 'R': dir_recurse = 1; break; 1765 case 'R': dir_recurse = 1; break;
659 case 'm': dir_crossmount = 0; break; 1766 case 'm': dir_crossmount = 0; break;
1767 case 'X': ++fix_elf; break;
660 case 'x': show_pax = 1; break; 1768 case 'x': show_pax = 1; break;
661 case 'e': show_stack = 1; break; 1769 case 'e': show_phdr = 1; break;
662 case 't': show_textrel = 1; break; 1770 case 't': show_textrel = 1; break;
663 case 'r': show_rpath = 1; break; 1771 case 'r': show_rpath = 1; break;
664 case 'n': show_needed = 1; break; 1772 case 'n': show_needed = 1; break;
665 case 'i': show_interp = 1; break; 1773 case 'i': show_interp = 1; break;
1774 case 'b': show_bind = 1; break;
1775 case 'S': show_soname = 1; break;
1776 case 'T': show_textrels = 1; break;
666 case 'q': be_quiet = 1; break; 1777 case 'q': be_quiet = 1; break;
667 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1778 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; 1779 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
669 1780
670 case ':': 1781 case ':':
671 warn("Option missing parameter\n"); 1782 err("Option '%c' is missing parameter", optopt);
672 usage(EXIT_FAILURE);
673 break;
674 case '?': 1783 case '?':
675 warn("Unknown option\n"); 1784 err("Unknown option '%c' or argument missing", optopt);
676 usage(EXIT_FAILURE);
677 break;
678 default: 1785 default:
679 err("Unhandled option '%c'", flag); 1786 err("Unhandled option '%c'; please report this", i);
680 break;
681 }
682 } 1787 }
683 1788 }
684 if (be_quiet && be_verbose) 1789 if (show_textrels && be_verbose) {
685 err("You can be quiet or you can be verbose, not both, stupid"); 1790 if (which("objdump") != NULL)
686 1791 has_objdump = 1;
1792 }
687 /* let the format option override all other options */ 1793 /* let the format option override all other options */
688 if (out_format) { 1794 if (out_format) {
689 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0; 1795 show_pax = show_phdr = show_textrel = show_rpath = \
1796 show_needed = show_interp = show_bind = show_soname = \
1797 show_textrels = 0;
690 for (flag=0; out_format[flag]; ++flag) { 1798 for (i = 0; out_format[i]; ++i) {
691 if (out_format[flag] != '%') continue; 1799 if (!IS_MODIFIER(out_format[i])) continue;
692 1800
693 switch (out_format[++flag]) { 1801 switch (out_format[++i]) {
1802 case '+': break;
694 case '%': break; 1803 case '%': break;
1804 case '#': break;
695 case 'F': break; 1805 case 'F': break;
1806 case 'p': break;
1807 case 'f': break;
1808 case 'k': break;
696 case 's': break; 1809 case 's': break;
1810 case 'N': break;
697 case 'o': break; 1811 case 'o': break;
1812 case 'a': break;
1813 case 'M': break;
698 case 'x': show_pax = 1; break; 1814 case 'x': show_pax = 1; break;
699 case 'e': show_stack = 1; break; 1815 case 'e': show_phdr = 1; break;
700 case 't': show_textrel = 1; break; 1816 case 't': show_textrel = 1; break;
701 case 'r': show_rpath = 1; break; 1817 case 'r': show_rpath = 1; break;
702 case 'n': show_needed = 1; break; 1818 case 'n': show_needed = 1; break;
703 case 'i': show_interp = 1; break; 1819 case 'i': show_interp = 1; break;
1820 case 'b': show_bind = 1; break;
1821 case 'S': show_soname = 1; break;
1822 case 'T': show_textrels = 1; break;
704 default: 1823 default:
705 err("Invalid format specifier '%c' (byte %i)", 1824 err("Invalid format specifier '%c' (byte %i)",
706 out_format[flag], flag+1); 1825 out_format[i], i+1);
707 } 1826 }
708 } 1827 }
709 1828
710 /* construct our default format */ 1829 /* construct our default format */
711 } else { 1830 } else {
712 size_t fmt_len = 30; 1831 size_t fmt_len = 30;
713 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 1832 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
714 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 1833 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
715 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 1834 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
716 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len); 1835 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
717 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 1836 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
718 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 1837 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
719 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 1838 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
720 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 1839 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1840 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1841 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1842 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
721 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 1843 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1844 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1845 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
722 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1846 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
723 } 1847 }
724 if (be_verbose > 2) printf("Format: %s\n", out_format); 1848 if (be_verbose > 2) printf("Format: %s\n", out_format);
725 1849
726 /* now lets actually do the scanning */ 1850 /* now lets actually do the scanning */
1851 if (scan_ldpath || use_ldcache)
1852 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
727 if (scan_ldpath) scanelf_ldpath(); 1853 if (scan_ldpath) scanelf_ldpath();
728 if (scan_envpath) scanelf_envpath(); 1854 if (scan_envpath) scanelf_envpath();
1855 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1856 from_file = "-";
1857 if (from_file) {
1858 scanelf_from_file(from_file);
1859 from_file = *argv;
1860 }
729 if (optind == argc && !scan_ldpath && !scan_envpath) 1861 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
730 err("Nothing to scan !?"); 1862 err("Nothing to scan !?");
731 while (optind < argc) 1863 while (optind < argc) {
732 scanelf_dir(argv[optind++]); 1864 search_path = argv[optind++];
1865 ret = scanelf_dir(search_path);
1866 }
733 1867
734 /* clean up */ 1868 /* clean up */
735 if (find_sym) {
736 free(find_sym);
737 free(versioned_symname); 1869 free(versioned_symname);
1870 for (i = 0; ldpaths[i]; ++i)
1871 free(ldpaths[i]);
1872
1873 if (ldcache != 0)
1874 munmap(ldcache, ldcache_size);
1875 return ret;
1876}
1877
1878static char **get_split_env(const char *envvar)
1879{
1880 const char *delims = " \t\n";
1881 char **envvals = NULL;
1882 char *env, *s;
1883 int nentry;
1884
1885 if ((env = getenv(envvar)) == NULL)
1886 return NULL;
1887
1888 env = xstrdup(env);
1889 if (env == NULL)
1890 return NULL;
1891
1892 s = strtok(env, delims);
1893 if (s == NULL) {
1894 free(env);
1895 return NULL;
738 } 1896 }
739 if (out_format) free(out_format); 1897
1898 nentry = 0;
1899 while (s != NULL) {
1900 ++nentry;
1901 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1902 envvals[nentry-1] = s;
1903 s = strtok(NULL, delims);
1904 }
1905 envvals[nentry] = NULL;
1906
1907 /* don't want to free(env) as it contains the memory that backs
1908 * the envvals array of strings */
1909 return envvals;
1910}
1911static void parseenv()
1912{
1913 qa_textrels = get_split_env("QA_TEXTRELS");
1914 qa_execstack = get_split_env("QA_EXECSTACK");
1915 qa_wx_load = get_split_env("QA_WX_LOAD");
1916}
1917
1918#ifdef __PAX_UTILS_CLEANUP
1919static void cleanup()
1920{
1921 free(out_format);
1922 free(qa_textrels);
1923 free(qa_execstack);
1924 free(qa_wx_load);
1925}
1926#endif
1927
1928
1929int main(int argc, char *argv[])
1930{
1931 int ret;
1932 if (argc < 2)
1933 usage(EXIT_FAILURE);
1934 parseenv();
1935 ret = parseargs(argc, argv);
1936 fclose(stdout);
1937#ifdef __PAX_UTILS_CLEANUP
1938 cleanup();
1939 warn("The calls to add/delete heap should be off:\n"
1940 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1941 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1942#endif
1943 return ret;
740} 1944}
741 1945
742 1946
743 1947
744/* utility funcs */ 1948/* utility funcs */
745static char *xstrdup(char *s) 1949static char *xstrdup(const char *s)
746{ 1950{
747 char *ret = strdup(s); 1951 char *ret = strdup(s);
748 if (!ret) err("Could not strdup(): %s", strerror(errno)); 1952 if (!ret) err("Could not strdup(): %s", strerror(errno));
749 return ret; 1953 return ret;
750} 1954}
752{ 1956{
753 void *ret = malloc(size); 1957 void *ret = malloc(size);
754 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 1958 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
755 return ret; 1959 return ret;
756} 1960}
1961static void *xrealloc(void *ptr, size_t size)
1962{
1963 void *ret = realloc(ptr, size);
1964 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
1965 return ret;
1966}
757static void xstrcat(char **dst, const char *src, size_t *curr_len) 1967static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
758{ 1968{
759 long new_len; 1969 size_t new_len;
760 1970
761 new_len = strlen(*dst) + strlen(src); 1971 new_len = strlen(*dst) + strlen(src);
762 if (*curr_len <= new_len) { 1972 if (*curr_len <= new_len) {
763 *curr_len = new_len + (*curr_len / 2); 1973 *curr_len = new_len + (*curr_len / 2);
764 *dst = realloc(*dst, *curr_len); 1974 *dst = realloc(*dst, *curr_len);
765 if (!*dst) 1975 if (!*dst)
766 err("could not realloc %li bytes", (unsigned long)*curr_len); 1976 err("could not realloc() %li bytes", (unsigned long)*curr_len);
767 } 1977 }
768 1978
1979 if (n)
1980 strncat(*dst, src, n);
1981 else
769 strcat(*dst, src); 1982 strcat(*dst, src);
770} 1983}
771static inline void xchrcat(char **dst, const char append, size_t *curr_len) 1984static inline void xchrcat(char **dst, const char append, size_t *curr_len)
772{ 1985{
773 static char my_app[2]; 1986 static char my_app[2];
774 my_app[0] = append; 1987 my_app[0] = append;
775 my_app[1] = '\0'; 1988 my_app[1] = '\0';
776 xstrcat(dst, my_app, curr_len); 1989 xstrcat(dst, my_app, curr_len);
777} 1990}
778static int xemptybuffer(const char *buff) 1991
1992/* Match filename against entries in matchlist, return TRUE
1993 * if the file is listed */
1994static int file_matches_list(const char *filename, char **matchlist)
779{ 1995{
780 long i; 1996 char **file;
781 for (i=0; buff[i]; ++i) 1997 char *match;
782 if (buff[i] != ' ') 1998 char buf[__PAX_UTILS_PATH_MAX];
1999
2000 if (matchlist == NULL)
783 return 0; 2001 return 0;
2002
2003 for (file = matchlist; *file != NULL; file++) {
2004 if (search_path) {
2005 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2006 match = buf;
2007 } else {
2008 match = *file;
2009 }
2010 if (fnmatch(match, filename, 0) == 0)
784 return 1; 2011 return 1;
2012 }
2013 return 0;
785} 2014}
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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