/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.73 Revision 1.119
1/* 1/*
2 * Copyright 2003-2005 Gentoo Foundation 2 * Copyright 2003-2006 Gentoo Foundation
3 * Distributed under the terms of the GNU General Public License v2 3 * Distributed under the terms of the GNU General Public License v2
4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.73 2005/06/04 13:52:54 solar Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.119 2006/02/05 02:25:58 solar Exp $
5 * 5 *
6 ******************************************************************** 6 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org>
7 * This program is free software; you can redistribute it and/or 7 * Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org>
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of the
10 * License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
20 * MA 02111-1307, USA.
21 */ 8 */
22 9
23#include <stdio.h>
24#include <stdlib.h>
25#include <sys/types.h>
26#include <libgen.h>
27#include <limits.h>
28#define __USE_GNU
29#include <string.h>
30#include <errno.h>
31#include <unistd.h>
32#include <sys/stat.h>
33#include <dirent.h>
34#include <getopt.h>
35#include <assert.h>
36#include "paxelf.h" 10#include "paxinc.h"
37 11
38static const char *rcsid = "$Id: scanelf.c,v 1.73 2005/06/04 13:52:54 solar Exp $"; 12static const char *rcsid = "$Id: scanelf.c,v 1.119 2006/02/05 02:25:58 solar Exp $";
39#define argv0 "scanelf" 13#define argv0 "scanelf"
40 14
41#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#')
42 16
43 17
44 18
45/* prototypes */ 19/* prototypes */
20static int scanelf_elfobj(elfobj *elf);
21static int scanelf_elf(const char *filename, int fd, size_t len);
22static int scanelf_archive(const char *filename, int fd, size_t len);
46static void scanelf_file(const char *filename); 23static void scanelf_file(const char *filename);
47static void scanelf_dir(const char *path); 24static void scanelf_dir(const char *path);
48static void scanelf_ldpath(); 25static void scanelf_ldpath(void);
49static void scanelf_envpath(); 26static void scanelf_envpath(void);
50static void usage(int status); 27static void usage(int status);
51static void parseargs(int argc, char *argv[]); 28static void parseargs(int argc, char *argv[]);
52static char *xstrdup(const char *s); 29static char *xstrdup(const char *s);
53static void *xmalloc(size_t size); 30static void *xmalloc(size_t size);
54static void xstrcat(char **dst, const char *src, size_t *curr_len); 31static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
32#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
55static inline void xchrcat(char **dst, const char append, size_t *curr_len); 33static inline void xchrcat(char **dst, const char append, size_t *curr_len);
56 34
57/* variables to control behavior */ 35/* variables to control behavior */
36static char match_etypes[126] = "";
58static char *ldpaths[256]; 37static char *ldpaths[256];
59static char scan_ldpath = 0; 38static char scan_ldpath = 0;
60static char scan_envpath = 0; 39static char scan_envpath = 0;
61static char scan_symlink = 1; 40static char scan_symlink = 1;
41static char scan_archives = 0;
62static char dir_recurse = 0; 42static char dir_recurse = 0;
63static char dir_crossmount = 1; 43static char dir_crossmount = 1;
64static char show_pax = 0; 44static char show_pax = 0;
65static char show_phdr = 0; 45static char show_phdr = 0;
66static char show_textrel = 0; 46static char show_textrel = 0;
67static char show_rpath = 0; 47static char show_rpath = 0;
68static char show_needed = 0; 48static char show_needed = 0;
69static char show_interp = 0; 49static char show_interp = 0;
70static char show_bind = 0; 50static char show_bind = 0;
51static char show_soname = 0;
52static char show_textrels = 0;
71static char show_banner = 1; 53static char show_banner = 1;
72static char be_quiet = 0; 54static char be_quiet = 0;
73static char be_verbose = 0; 55static char be_verbose = 0;
74static char be_wewy_wewy_quiet = 0; 56static char be_wewy_wewy_quiet = 0;
75static char *find_sym = NULL, *versioned_symname = NULL; 57static char *find_sym = NULL, *versioned_symname = NULL;
76static char *find_lib = NULL; 58static char *find_lib = NULL;
77static char *out_format = NULL; 59static char *out_format = NULL;
78static char *search_path = NULL; 60static char *search_path = NULL;
61static char fix_elf = 0;
62static char gmatch = 0;
63static char use_ldcache = 0;
79 64
80 65
66caddr_t ldcache = 0;
67size_t ldcache_size = 0;
81 68
82/* sub-funcs for scanelf_file() */ 69/* sub-funcs for scanelf_file() */
70static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
71{
72 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
73#define GET_SYMTABS(B) \
74 if (elf->elf_class == ELFCLASS ## B) { \
75 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
76 /* debug sections */ \
77 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
78 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
79 /* runtime sections */ \
80 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
81 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
82 if (symtab && dynsym) { \
83 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
84 } else { \
85 *sym = (void*)(symtab ? symtab : dynsym); \
86 } \
87 if (strtab && dynstr) { \
88 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
89 } else { \
90 *tab = (void*)(strtab ? strtab : dynstr); \
91 } \
92 }
93 GET_SYMTABS(32)
94 GET_SYMTABS(64)
95}
83static char *scanelf_file_pax(elfobj *elf, char *found_pax) 96static char *scanelf_file_pax(elfobj *elf, char *found_pax)
84{ 97{
85 static char *paxflags;
86 static char ret[7]; 98 static char ret[7];
87 unsigned long i, shown; 99 unsigned long i, shown;
88
89 100
90 if (!show_pax) return NULL; 101 if (!show_pax) return NULL;
91 102
92 shown = 0; 103 shown = 0;
93 memset(&ret, 0, sizeof(ret)); 104 memset(&ret, 0, sizeof(ret));
112 SHOW_PAX(64) 123 SHOW_PAX(64)
113 } 124 }
114 125
115 /* fall back to EI_PAX if no PT_PAX was found */ 126 /* fall back to EI_PAX if no PT_PAX was found */
116 if (!*ret) { 127 if (!*ret) {
128 static char *paxflags;
117 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 129 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
118 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) { 130 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
119 *found_pax = 1; 131 *found_pax = 1;
120 return paxflags; 132 return (be_wewy_wewy_quiet ? NULL : paxflags);
121 } 133 }
122 strncpy(ret, paxflags, sizeof(ret)); 134 strncpy(ret, paxflags, sizeof(ret));
123 // ++shown;
124 } 135 }
125 136
126 if (be_quiet && !shown) 137 if (be_wewy_wewy_quiet || (be_quiet && !shown))
127 return NULL; 138 return NULL;
139 else
128 return ret; 140 return ret;
129
130} 141}
142
131static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 143static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
132{ 144{
133 static char ret[12]; 145 static char ret[12];
134 char *found; 146 char *found;
135 unsigned long i, off, shown, check_flags;
136 unsigned char multi_stack, multi_relro, multi_load; 147 unsigned long i, shown, multi_stack, multi_relro, multi_load;
148 int max_pt_load;
137 149
138 if (!show_phdr) return NULL; 150 if (!show_phdr) return NULL;
139 151
140 memcpy(ret, "--- --- ---\0", 12); 152 memcpy(ret, "--- --- ---\0", 12);
141 153
142 shown = 0; 154 shown = 0;
143 multi_stack = multi_relro = multi_load = 0; 155 multi_stack = multi_relro = multi_load = 0;
156 max_pt_load = elf_max_pt_load(elf);
144 157
145 if (elf->phdr) { 158#define NOTE_GNU_STACK ".note.GNU-stack"
146#define SHOW_PHDR(B) \ 159#define SHOW_PHDR(B) \
147 if (elf->elf_class == ELFCLASS ## B) { \ 160 if (elf->elf_class == ELFCLASS ## B) { \
148 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
162 Elf ## B ## _Off offset; \
163 uint32_t flags, check_flags; \
164 if (elf->phdr != NULL) { \
149 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 165 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
150 uint32_t flags; \
151 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 166 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
152 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 167 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
153 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 168 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
154 found = found_phdr; \ 169 found = found_phdr; \
155 off = 0; \ 170 offset = 0; \
156 check_flags = PF_X; \ 171 check_flags = PF_X; \
157 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 172 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
158 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 173 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
159 found = found_relro; \ 174 found = found_relro; \
160 off = 4; \ 175 offset = 4; \
161 check_flags = PF_X; \ 176 check_flags = PF_X; \
162 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 177 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
178 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
163 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 179 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
164 found = found_load; \ 180 found = found_load; \
165 off = 8; \ 181 offset = 8; \
166 check_flags = PF_W|PF_X; \ 182 check_flags = PF_W|PF_X; \
167 } else \ 183 } else \
168 continue; \ 184 continue; \
169 flags = EGET(phdr[i].p_flags); \ 185 flags = EGET(phdr[i].p_flags); \
170 if (be_quiet && ((flags & check_flags) != check_flags)) \ 186 if (be_quiet && ((flags & check_flags) != check_flags)) \
171 continue; \ 187 continue; \
188 if (fix_elf && ((flags & PF_X) != flags)) { \
189 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
190 ret[3] = ret[7] = '!'; \
191 flags = EGET(phdr[i].p_flags); \
192 } \
172 memcpy(ret+off, gnu_short_stack_flags(flags), 3); \ 193 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
173 *found = 1; \ 194 *found = 1; \
174 ++shown; \ 195 ++shown; \
196 } \
197 } else if (elf->shdr != NULL) { \
198 /* no program headers which means this is prob an object file */ \
199 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
200 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
201 char *str; \
202 if ((void*)strtbl > (void*)elf->data_end) \
203 goto skip_this_shdr##B; \
204 check_flags = SHF_WRITE|SHF_EXECINSTR; \
205 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
206 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
207 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
208 str = elf->data + offset; \
209 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
210 if (!strcmp(str, NOTE_GNU_STACK)) { \
211 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
212 flags = EGET(shdr[i].sh_flags); \
213 if (be_quiet && ((flags & check_flags) != check_flags)) \
214 continue; \
215 ++*found_phdr; \
216 shown = 1; \
217 if (flags & SHF_WRITE) ret[0] = 'W'; \
218 if (flags & SHF_ALLOC) ret[1] = 'A'; \
219 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
220 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
221 break; \
222 } \
223 } \
224 skip_this_shdr##B: \
225 if (!multi_stack) { \
226 *found_phdr = 1; \
227 shown = 1; \
228 memcpy(ret, "!WX", 3); \
229 } \
175 } \ 230 } \
176 } 231 }
177 SHOW_PHDR(32) 232 SHOW_PHDR(32)
178 SHOW_PHDR(64) 233 SHOW_PHDR(64)
179 }
180 234
181 if (be_quiet && !shown) 235 if (be_wewy_wewy_quiet || (be_quiet && !shown))
182 return NULL; 236 return NULL;
183 else 237 else
184 return ret; 238 return ret;
185} 239}
186static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 240static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
187{ 241{
188 static char ret[] = "TEXTREL"; 242 static const char *ret = "TEXTREL";
189 unsigned long i; 243 unsigned long i;
190 244
191 if (!show_textrel) return NULL; 245 if (!show_textrel && !show_textrels) return NULL;
192 246
193 if (elf->phdr) { 247 if (elf->phdr) {
194#define SHOW_TEXTREL(B) \ 248#define SHOW_TEXTREL(B) \
195 if (elf->elf_class == ELFCLASS ## B) { \ 249 if (elf->elf_class == ELFCLASS ## B) { \
196 Elf ## B ## _Dyn *dyn; \ 250 Elf ## B ## _Dyn *dyn; \
216 } 270 }
217 271
218 if (be_quiet || be_wewy_wewy_quiet) 272 if (be_quiet || be_wewy_wewy_quiet)
219 return NULL; 273 return NULL;
220 else 274 else
221 return (char *)" - "; 275 return " - ";
276}
277static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
278{
279 unsigned long s, r, rmax;
280 void *symtab_void, *strtab_void, *text_void;
281
282 if (!show_textrels) return NULL;
283
284 /* don't search for TEXTREL's if the ELF doesn't have any */
285 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
286 if (!*found_textrel) return NULL;
287
288 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
289 text_void = elf_findsecbyname(elf, ".text");
290
291 if (symtab_void && strtab_void && text_void && elf->shdr) {
292#define SHOW_TEXTRELS(B) \
293 if (elf->elf_class == ELFCLASS ## B) { \
294 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
295 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
296 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
297 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
298 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
299 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
300 uint ## B ## _t memsz = EGET(text->sh_size); \
301 Elf ## B ## _Rel *rel; \
302 Elf ## B ## _Rela *rela; \
303 /* search the section headers for relocations */ \
304 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
305 uint32_t sh_type = EGET(shdr[s].sh_type); \
306 if (sh_type == SHT_REL) { \
307 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
308 rela = NULL; \
309 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
310 } else if (sh_type == SHT_RELA) { \
311 rel = NULL; \
312 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
313 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
314 } else \
315 continue; \
316 /* now see if any of the relocs are in the .text */ \
317 for (r = 0; r < rmax; ++r) { \
318 unsigned long sym_max; \
319 Elf ## B ## _Addr offset_tmp; \
320 Elf ## B ## _Sym *func; \
321 Elf ## B ## _Sym *sym; \
322 Elf ## B ## _Addr r_offset; \
323 uint ## B ## _t r_info; \
324 if (sh_type == SHT_REL) { \
325 r_offset = EGET(rel[r].r_offset); \
326 r_info = EGET(rel[r].r_info); \
327 } else { \
328 r_offset = EGET(rela[r].r_offset); \
329 r_info = EGET(rela[r].r_info); \
330 } \
331 /* make sure this relocation is inside of the .text */ \
332 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
333 if (be_verbose <= 2) continue; \
334 } else \
335 *found_textrels = 1; \
336 /* locate this relocation symbol name */ \
337 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
338 if ((void*)sym > (void*)elf->data_end) { \
339 warn("%s: corrupt ELF symbol", elf->filename); \
340 continue; \
341 } \
342 sym_max = ELF ## B ## _R_SYM(r_info); \
343 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
344 sym += sym_max; \
345 else \
346 sym = NULL; \
347 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
348 /* show the raw details about this reloc */ \
349 printf(" %s: ", elf->base_filename); \
350 if (sym && sym->st_name) \
351 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
352 else \
353 printf("(memory/fake?)"); \
354 printf(" [0x%lX]", (unsigned long)r_offset); \
355 /* now try to find the closest symbol that this rel is probably in */ \
356 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
357 func = NULL; \
358 offset_tmp = 0; \
359 while (sym_max--) { \
360 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
361 func = sym; \
362 offset_tmp = EGET(sym->st_value); \
363 } \
364 ++sym; \
365 } \
366 printf(" in "); \
367 if (func && func->st_name) \
368 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
369 else \
370 printf("(NULL: fake?)"); \
371 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
372 } \
373 } }
374 SHOW_TEXTRELS(32)
375 SHOW_TEXTRELS(64)
376 }
377 if (!*found_textrels)
378 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
379
380 return NULL;
381}
382
383static void rpath_security_checks(elfobj *, char *, const char *);
384static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
385{
386 struct stat st;
387 switch (*item) {
388 case '/': break;
389 case '.':
390 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
391 break;
392 case ':':
393 case '\0':
394 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
395 break;
396 case '$':
397 if (fstat(elf->fd, &st) != -1)
398 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
399 warnf("Security problem with %s='%s' in %s with mode set of %o",
400 dt_type, item, elf->filename, st.st_mode & 07777);
401 break;
402 default:
403 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
404 break;
405 }
222} 406}
223static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 407static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
224{ 408{
225 unsigned long i, s; 409 unsigned long i, s;
226 char *rpath, *runpath, **r; 410 char *rpath, *runpath, **r;
260 /* Verify the memory is somewhat sane */ \ 444 /* Verify the memory is somewhat sane */ \
261 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 445 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
262 if (offset < (Elf ## B ## _Off)elf->len) { \ 446 if (offset < (Elf ## B ## _Off)elf->len) { \
263 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 447 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
264 *r = (char*)(elf->data + offset); \ 448 *r = (char*)(elf->data + offset); \
449 /* cache the length in case we need to nuke this section later on */ \
450 if (fix_elf) \
451 offset = strlen(*r); \
265 /* If quiet, don't output paths in ld.so.conf */ \ 452 /* If quiet, don't output paths in ld.so.conf */ \
266 if (be_quiet) { \ 453 if (be_quiet) { \
267 size_t len; \ 454 size_t len; \
268 char *start, *end; \ 455 char *start, *end; \
269 for (s = 0; *r && ldpaths[s]; ++s) { \ 456 /* note that we only 'chop' off leading known paths. */ \
457 /* since *r is read-only memory, we can only move the ptr forward. */ \
458 start = *r; \
270 /* scan each path in : delimited list */ \ 459 /* scan each path in : delimited list */ \
271 start = *r; \ 460 while (start) { \
461 rpath_security_checks(elf, start, get_elfdtype(word)); \
272 end = strchr(start, ':'); \ 462 end = strchr(start, ':'); \
273 while ((start && ((end = strchr(start, ':')) != NULL)) || start) { \
274 len = (end ? abs(end - start) : strlen(start)); \ 463 len = (end ? abs(end - start) : strlen(start)); \
464 if (use_ldcache) \
465 for (s = 0; ldpaths[s]; ++s) \
275 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 466 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
276 *r = (end ? end + 1 : NULL); \ 467 *r = end; \
468 /* corner case ... if RPATH reads "/usr/lib:", we want \
469 * to show ':' rather than '' */ \
470 if (end && end[1] != '\0') \
471 (*r)++; \
277 break; \ 472 break; \
278 } \ 473 } \
474 if (!*r || !end) \
475 break; \
476 else \
279 start = (end ? start + len + 1 : NULL); \ 477 start = start + len + 1; \
280 } \
281 } \ 478 } \
282 } \ 479 } \
480 if (*r) { \
481 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
482 /* just nuke it */ \
483 nuke_it##B: \
484 memset(*r, 0x00, offset); \
485 *r = NULL; \
486 ESET(dyn->d_tag, DT_DEBUG); \
487 ESET(dyn->d_un.d_ptr, 0); \
488 } else if (fix_elf) { \
489 /* try to clean "bad" paths */ \
490 size_t len, tmpdir_len; \
491 char *start, *end; \
492 const char *tmpdir; \
493 start = *r; \
494 tmpdir = (getenv("TMPDIR") ? : "."); \
495 tmpdir_len = strlen(tmpdir); \
496 while (1) { \
497 end = strchr(start, ':'); \
498 if (start == end) { \
499 eat_this_path##B: \
500 len = strlen(end); \
501 memmove(start, end+1, len); \
502 start[len-1] = '\0'; \
503 end = start - 1; \
504 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
505 if (!end) { \
506 if (start == *r) \
507 goto nuke_it##B; \
508 *--start = '\0'; \
509 } else \
510 goto eat_this_path##B; \
511 } \
512 if (!end) \
513 break; \
514 start = end + 1; \
515 } \
516 if (**r == '\0') \
517 goto nuke_it##B; \
518 } \
519 if (*r) \
283 if (*r) *found_rpath = 1; \ 520 *found_rpath = 1; \
521 } \
284 } \ 522 } \
285 ++dyn; \ 523 ++dyn; \
286 } \ 524 } \
287 } } 525 } }
288 SHOW_RPATH(32) 526 SHOW_RPATH(32)
305 } else if (rpath || runpath) 543 } else if (rpath || runpath)
306 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 544 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
307 else if (!be_quiet) 545 else if (!be_quiet)
308 xstrcat(ret, " - ", ret_len); 546 xstrcat(ret, " - ", ret_len);
309} 547}
548
549#define LDSO_CACHE_MAGIC "ld.so-"
550#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
551#define LDSO_CACHE_VER "1.7.0"
552#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
553#define FLAG_ANY -1
554#define FLAG_TYPE_MASK 0x00ff
555#define FLAG_LIBC4 0x0000
556#define FLAG_ELF 0x0001
557#define FLAG_ELF_LIBC5 0x0002
558#define FLAG_ELF_LIBC6 0x0003
559#define FLAG_REQUIRED_MASK 0xff00
560#define FLAG_SPARC_LIB64 0x0100
561#define FLAG_IA64_LIB64 0x0200
562#define FLAG_X8664_LIB64 0x0300
563#define FLAG_S390_LIB64 0x0400
564#define FLAG_POWERPC_LIB64 0x0500
565#define FLAG_MIPS64_LIBN32 0x0600
566#define FLAG_MIPS64_LIBN64 0x0700
567
568static char *lookup_cache_lib(elfobj *, char *);
569static char *lookup_cache_lib(elfobj *elf, char *fname)
570{
571 int fd = 0;
572 char *strs;
573 static char buf[__PAX_UTILS_PATH_MAX] = "";
574 const char *cachefile = "/etc/ld.so.cache";
575 struct stat st;
576
577 typedef struct {
578 char magic[LDSO_CACHE_MAGIC_LEN];
579 char version[LDSO_CACHE_VER_LEN];
580 int nlibs;
581 } header_t;
582 header_t *header;
583
584 typedef struct {
585 int flags;
586 int sooffset;
587 int liboffset;
588 } libentry_t;
589 libentry_t *libent;
590
591 if (fname == NULL)
592 return NULL;
593
594 if (ldcache == 0) {
595 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
596 return NULL;
597
598 /* cache these values so we only map/unmap the cache file once */
599 ldcache_size = st.st_size;
600 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
601
602 close(fd);
603
604 if (ldcache == (caddr_t)-1) {
605 ldcache = 0;
606 return NULL;
607 }
608
609 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
610 return NULL;
611 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
612 return NULL;
613 }
614
615 header = (header_t *) ldcache;
616 libent = (libentry_t *) (ldcache + sizeof(header_t));
617 strs = (char *) &libent[header->nlibs];
618
619 for (fd = 0; fd < header->nlibs; fd++) {
620 /* this should be more fine grained, but for now we assume that
621 * diff arches will not be cached together. and we ignore the
622 * the different multilib mips cases. */
623 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
624 continue;
625 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
626 continue;
627
628 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
629 continue;
630 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
631 }
632 return buf;
633}
634
635
310static char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 636static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
311{ 637{
312 unsigned long i; 638 unsigned long i;
313 char *needed; 639 char *needed;
314 void *strtbl_void; 640 void *strtbl_void;
641 char *p;
315 642
316 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 643 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
317 644
318 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 645 strtbl_void = elf_findsecbyname(elf, ".dynstr");
319 646
339 } \ 666 } \
340 needed = (char*)(elf->data + offset); \ 667 needed = (char*)(elf->data + offset); \
341 if (op == 0) { \ 668 if (op == 0) { \
342 if (!be_wewy_wewy_quiet) { \ 669 if (!be_wewy_wewy_quiet) { \
343 if (*found_needed) xchrcat(ret, ',', ret_len); \ 670 if (*found_needed) xchrcat(ret, ',', ret_len); \
671 if (use_ldcache) \
672 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
673 needed = p; \
344 xstrcat(ret, needed, ret_len); \ 674 xstrcat(ret, needed, ret_len); \
345 } \ 675 } \
346 *found_needed = 1; \ 676 *found_needed = 1; \
347 } else { \ 677 } else { \
348 if (strcmp(find_lib, needed)) return NULL; \ 678 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
349 *found_lib = 1; \ 679 *found_lib = 1; \
350 return (be_wewy_wewy_quiet ? NULL : find_lib); \ 680 return (be_wewy_wewy_quiet ? NULL : needed); \
681 } \
351 } \ 682 } \
352 } \ 683 } \
353 ++dyn; \ 684 ++dyn; \
354 } \ 685 } \
355 } } 686 } }
356 SHOW_NEEDED(32) 687 SHOW_NEEDED(32)
357 SHOW_NEEDED(64) 688 SHOW_NEEDED(64)
689 if (op == 0 && !*found_needed && be_verbose)
690 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
358 } 691 }
359 692
360 return NULL; 693 return NULL;
361} 694}
362static char *scanelf_file_interp(elfobj *elf, char *found_interp) 695static char *scanelf_file_interp(elfobj *elf, char *found_interp)
420 } else { 753 } else {
421 *found_bind = 1; 754 *found_bind = 1;
422 return (char *) "LAZY"; 755 return (char *) "LAZY";
423 } 756 }
424} 757}
758static char *scanelf_file_soname(elfobj *elf, char *found_soname)
759{
760 unsigned long i;
761 char *soname;
762 void *strtbl_void;
763
764 if (!show_soname) return NULL;
765
766 strtbl_void = elf_findsecbyname(elf, ".dynstr");
767
768 if (elf->phdr && strtbl_void) {
769#define SHOW_SONAME(B) \
770 if (elf->elf_class == ELFCLASS ## B) { \
771 Elf ## B ## _Dyn *dyn; \
772 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
773 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
774 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
775 Elf ## B ## _Off offset; \
776 /* only look for soname in shared objects */ \
777 if (ehdr->e_type != ET_DYN) \
778 return NULL; \
779 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
780 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
781 offset = EGET(phdr[i].p_offset); \
782 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
783 dyn = DYN ## B (elf->data + offset); \
784 while (EGET(dyn->d_tag) != DT_NULL) { \
785 if (EGET(dyn->d_tag) == DT_SONAME) { \
786 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
787 if (offset >= (Elf ## B ## _Off)elf->len) { \
788 ++dyn; \
789 continue; \
790 } \
791 soname = (char*)(elf->data + offset); \
792 *found_soname = 1; \
793 return (be_wewy_wewy_quiet ? NULL : soname); \
794 } \
795 ++dyn; \
796 } \
797 } }
798 SHOW_SONAME(32)
799 SHOW_SONAME(64)
800 }
801
802 return NULL;
803}
425static char *scanelf_file_sym(elfobj *elf, char *found_sym) 804static char *scanelf_file_sym(elfobj *elf, char *found_sym)
426{ 805{
427 unsigned long i; 806 unsigned long i;
807 char *ret;
428 void *symtab_void, *strtab_void; 808 void *symtab_void, *strtab_void;
429 809
430 if (!find_sym) return NULL; 810 if (!find_sym) return NULL;
811 ret = find_sym;
431 812
432 /* debug sections */ 813 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
433 symtab_void = elf_findsecbyname(elf, ".symtab");
434 strtab_void = elf_findsecbyname(elf, ".strtab");
435 /* fall back to runtime sections */
436 if (!symtab_void || !strtab_void) {
437 symtab_void = elf_findsecbyname(elf, ".dynsym");
438 strtab_void = elf_findsecbyname(elf, ".dynstr");
439 }
440 814
441 if (symtab_void && strtab_void) { 815 if (symtab_void && strtab_void) {
442 char *base, *basemem;
443 basemem = xstrdup(elf->filename);
444 base = basename(basemem);
445#define FIND_SYM(B) \ 816#define FIND_SYM(B) \
446 if (elf->elf_class == ELFCLASS ## B) { \ 817 if (elf->elf_class == ELFCLASS ## B) { \
447 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 818 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
448 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 819 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
449 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 820 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
450 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 821 unsigned long cnt = EGET(symtab->sh_entsize); \
451 char *symname; \ 822 char *symname; \
823 if (cnt) \
824 cnt = EGET(symtab->sh_size) / cnt; \
452 for (i = 0; i < cnt; ++i) { \ 825 for (i = 0; i < cnt; ++i) { \
453 if (sym->st_name) { \ 826 if (sym->st_name) { \
454 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 827 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
828 if ((void*)symname > (void*)elf->data_end) { \
829 warnf("%s: corrupt ELF symbols", elf->filename); \
830 continue; \
831 } \
455 if (*find_sym == '*') { \ 832 if (*find_sym == '*') { \
456 printf("%s(%s) %5lX %15s %s\n", \ 833 printf("%s(%s) %5lX %15s %s\n", \
457 ((*found_sym == 0) ? "\n\t" : "\t"), \ 834 ((*found_sym == 0) ? "\n\t" : "\t"), \
458 base, \ 835 elf->base_filename, \
459 (long)sym->st_size, \ 836 (unsigned long)sym->st_size, \
460 (char *)get_elfstttype(sym->st_info), \ 837 get_elfstttype(sym->st_info), \
461 symname); \ 838 symname); \
462 *found_sym = 1; \ 839 *found_sym = 1; \
463 } else if ((strcmp(find_sym, symname) == 0) || \ 840 } else { \
841 char *this_sym, *next_sym; \
842 this_sym = find_sym; \
843 do { \
844 next_sym = strchr(this_sym, ','); \
845 if (next_sym == NULL) \
846 next_sym = this_sym + strlen(this_sym); \
847 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
464 (strcmp(symname, versioned_symname) == 0)) \ 848 (strcmp(symname, versioned_symname) == 0)) { \
849 ret = this_sym; \
465 (*found_sym)++; \ 850 (*found_sym)++; \
851 goto break_out; \
852 } \
853 this_sym = next_sym + 1; \
854 } while (*next_sym != '\0'); \
855 } \
466 } \ 856 } \
467 ++sym; \ 857 ++sym; \
468 } } 858 } }
469 FIND_SYM(32) 859 FIND_SYM(32)
470 FIND_SYM(64) 860 FIND_SYM(64)
471 free(basemem);
472 } 861 }
473 862
863break_out:
474 if (be_wewy_wewy_quiet) return NULL; 864 if (be_wewy_wewy_quiet) return NULL;
475 865
476 if (*find_sym != '*' && *found_sym) 866 if (*find_sym != '*' && *found_sym)
477 return find_sym; 867 return ret;
478 if (be_quiet) 868 if (be_quiet)
479 return NULL; 869 return NULL;
480 else 870 else
481 return (char *)" - "; 871 return (char *)" - ";
482} 872}
873
874
483/* scan an elf file and show all the fun stuff */ 875/* scan an elf file and show all the fun stuff */
484#define prints(str) write(fileno(stdout), str, strlen(str)) 876#define prints(str) write(fileno(stdout), str, strlen(str))
485static void scanelf_file(const char *filename) 877static int scanelf_elfobj(elfobj *elf)
486{ 878{
487 unsigned long i; 879 unsigned long i;
488 char found_pax, found_phdr, found_relro, found_load, found_textrel, 880 char found_pax, found_phdr, found_relro, found_load, found_textrel,
489 found_rpath, found_needed, found_interp, found_bind, 881 found_rpath, found_needed, found_interp, found_bind, found_soname,
490 found_sym, found_lib, found_file; 882 found_sym, found_lib, found_file, found_textrels;
491 elfobj *elf;
492 struct stat st;
493 static char *out_buffer = NULL; 883 static char *out_buffer = NULL;
494 static size_t out_len; 884 static size_t out_len;
495 885
496 /* make sure 'filename' exists */
497 if (lstat(filename, &st) == -1) {
498 if (be_verbose > 2) printf("%s: does not exist\n", filename);
499 return;
500 }
501 /* always handle regular files and handle symlinked files if no -y */
502 if (S_ISLNK(st.st_mode)) {
503 if (!scan_symlink) return;
504 stat(filename, &st);
505 }
506 if (!S_ISREG(st.st_mode)) {
507 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
508 return;
509 }
510
511 found_pax = found_phdr = found_relro = found_load = \ 886 found_pax = found_phdr = found_relro = found_load = found_textrel = \
512 found_textrel = found_rpath = found_needed = found_interp = \ 887 found_rpath = found_needed = found_interp = found_bind = found_soname = \
513 found_bind = found_sym = found_lib = found_file = 0; 888 found_sym = found_lib = found_file = found_textrels = 0;
514 889
515 /* verify this is real ELF */
516 if ((elf = readelf(filename)) == NULL) {
517 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
518 return;
519 }
520
521 if (be_verbose > 1) 890 if (be_verbose > 2)
522 printf("%s: scanning file {%s,%s}\n", filename, 891 printf("%s: scanning file {%s,%s}\n", elf->filename,
523 get_elfeitype(EI_CLASS, elf->elf_class), 892 get_elfeitype(EI_CLASS, elf->elf_class),
524 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 893 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
525 else if (be_verbose) 894 else if (be_verbose > 1)
526 printf("%s: scanning file\n", filename); 895 printf("%s: scanning file\n", elf->filename);
527 896
528 /* init output buffer */ 897 /* init output buffer */
529 if (!out_buffer) { 898 if (!out_buffer) {
530 out_len = sizeof(char) * 80; 899 out_len = sizeof(char) * 80;
531 out_buffer = (char*)xmalloc(out_len); 900 out_buffer = (char*)xmalloc(out_len);
549 case 't': prints("TEXTREL "); break; 918 case 't': prints("TEXTREL "); break;
550 case 'r': prints("RPATH "); break; 919 case 'r': prints("RPATH "); break;
551 case 'n': prints("NEEDED "); break; 920 case 'n': prints("NEEDED "); break;
552 case 'i': prints("INTERP "); break; 921 case 'i': prints("INTERP "); break;
553 case 'b': prints("BIND "); break; 922 case 'b': prints("BIND "); break;
923 case 'S': prints("SONAME "); break;
554 case 's': prints("SYM "); break; 924 case 's': prints("SYM "); break;
555 case 'N': prints("LIB "); break; 925 case 'N': prints("LIB "); break;
926 case 'T': prints("TEXTRELS "); break;
927 default: warnf("'%c' has no title ?", out_format[i]);
556 } 928 }
557 } 929 }
558 if (!found_file) prints("FILE "); 930 if (!found_file) prints("FILE ");
559 prints("\n"); 931 prints("\n");
560 found_file = 0; 932 found_file = 0;
580 switch (out_format[++i]) { 952 switch (out_format[++i]) {
581 case '%': 953 case '%':
582 case '#': 954 case '#':
583 xchrcat(&out_buffer, out_format[i], &out_len); break; 955 xchrcat(&out_buffer, out_format[i], &out_len); break;
584 case 'F': 956 case 'F':
957 found_file = 1;
585 if (be_wewy_wewy_quiet) break; 958 if (be_wewy_wewy_quiet) break;
586 found_file = 1;
587 xstrcat(&out_buffer, filename, &out_len); 959 xstrcat(&out_buffer, elf->filename, &out_len);
588 break; 960 break;
589 case 'p': 961 case 'p':
962 found_file = 1;
590 if (be_wewy_wewy_quiet) break; 963 if (be_wewy_wewy_quiet) break;
591 found_file = 1;
592 tmp = filename; 964 tmp = elf->filename;
593 if (search_path) { 965 if (search_path) {
594 ssize_t len_search = strlen(search_path); 966 ssize_t len_search = strlen(search_path);
595 ssize_t len_file = strlen(filename); 967 ssize_t len_file = strlen(elf->filename);
596 if (!strncmp(filename, search_path, len_search) && \ 968 if (!strncmp(elf->filename, search_path, len_search) && \
597 len_file > len_search) 969 len_file > len_search)
598 tmp += len_search; 970 tmp += len_search;
599 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 971 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
600 } 972 }
601 xstrcat(&out_buffer, tmp, &out_len); 973 xstrcat(&out_buffer, tmp, &out_len);
602 break; 974 break;
603 case 'f': 975 case 'f':
976 found_file = 1;
604 if (be_wewy_wewy_quiet) break; 977 if (be_wewy_wewy_quiet) break;
605 found_file = 1;
606 tmp = strrchr(filename, '/'); 978 tmp = strrchr(elf->filename, '/');
607 tmp = (tmp == NULL ? filename : tmp+1); 979 tmp = (tmp == NULL ? elf->filename : tmp+1);
608 xstrcat(&out_buffer, tmp, &out_len); 980 xstrcat(&out_buffer, tmp, &out_len);
609 break; 981 break;
610 case 'o': out = get_elfetype(elf); break; 982 case 'o': out = get_elfetype(elf); break;
611 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 983 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
612 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break; 984 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
613 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 985 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
986 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
614 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 987 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
615 case 'n': 988 case 'n':
616 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 989 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
617 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 990 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
618 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 991 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
992 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
619 case 's': out = scanelf_file_sym(elf, &found_sym); break; 993 case 's': out = scanelf_file_sym(elf, &found_sym); break;
994 default: warnf("'%c' has no scan code?", out_format[i]);
620 } 995 }
996 if (out) {
997 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
998 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
999 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1000 else
621 if (out) xstrcat(&out_buffer, out, &out_len); 1001 xstrcat(&out_buffer, out, &out_len);
1002 }
622 } 1003 }
623 1004
624#define FOUND_SOMETHING() \ 1005#define FOUND_SOMETHING() \
625 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1006 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
626 found_rpath || found_needed || found_interp || found_bind || found_sym || found_lib) 1007 found_rpath || found_needed || found_interp || found_bind || \
1008 found_soname || found_sym || found_lib || found_textrels)
627 1009
628 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1010 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
629 xchrcat(&out_buffer, ' ', &out_len); 1011 xchrcat(&out_buffer, ' ', &out_len);
630 xstrcat(&out_buffer, filename, &out_len); 1012 xstrcat(&out_buffer, elf->filename, &out_len);
631 } 1013 }
632 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) 1014 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
633 puts(out_buffer); 1015 puts(out_buffer);
1016 fflush(stdout);
1017 }
634 1018
1019 return 0;
1020}
1021
1022/* scan a single elf */
1023static int scanelf_elf(const char *filename, int fd, size_t len)
1024{
1025 int ret;
1026 elfobj *elf;
1027
1028 /* verify this is real ELF */
1029 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1030 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1031 return 1;
1032 }
1033
1034 if (strlen(match_etypes)) {
1035 char sbuf[126];
1036 strncpy(sbuf, match_etypes, sizeof(sbuf));
1037 if (strchr(match_etypes, ',') != NULL) {
1038 char *p;
1039 while((p = strrchr(sbuf, ',')) != NULL) {
1040 *p = 0;
1041 if (atoi(p+1) == get_etype(elf))
1042 goto label_ret;
1043 }
1044 }
1045 if (atoi(sbuf) != get_etype(elf)) {
1046 ret = 1;
1047 goto label_done;
1048 }
1049 }
1050
1051label_ret:
1052 ret = scanelf_elfobj(elf);
1053
1054label_done:
635 unreadelf(elf); 1055 unreadelf(elf);
1056 return ret;
1057}
1058
1059/* scan an archive of elfs */
1060static int scanelf_archive(const char *filename, int fd, size_t len)
1061{
1062 archive_handle *ar;
1063 archive_member *m;
1064 char *ar_buffer;
1065 elfobj *elf;
1066
1067 ar = ar_open_fd(filename, fd);
1068 if (ar == NULL)
1069 return 1;
1070
1071 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1072 while ((m=ar_next(ar)) != NULL) {
1073 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1074 if (elf) {
1075 scanelf_elfobj(elf);
1076 unreadelf(elf);
1077 }
1078 }
1079 munmap(ar_buffer, len);
1080
1081 return 0;
1082}
1083/* scan a file which may be an elf or an archive or some other magical beast */
1084static void scanelf_file(const char *filename)
1085{
1086 struct stat st;
1087 int fd;
1088
1089 /* make sure 'filename' exists */
1090 if (lstat(filename, &st) == -1) {
1091 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1092 return;
1093 }
1094
1095 /* always handle regular files and handle symlinked files if no -y */
1096 if (S_ISLNK(st.st_mode)) {
1097 if (!scan_symlink) return;
1098 stat(filename, &st);
1099 }
1100 if (!S_ISREG(st.st_mode)) {
1101 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1102 return;
1103 }
1104
1105 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1106 return;
1107
1108 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives)
1109 /* if it isn't an ELF, maybe it's an .a archive */
1110 scanelf_archive(filename, fd, st.st_size);
1111
1112 close(fd);
636} 1113}
637 1114
638/* scan a directory for ET_EXEC files and print when we find one */ 1115/* scan a directory for ET_EXEC files and print when we find one */
639static void scanelf_dir(const char *path) 1116static void scanelf_dir(const char *path)
640{ 1117{
641 register DIR *dir; 1118 register DIR *dir;
642 register struct dirent *dentry; 1119 register struct dirent *dentry;
643 struct stat st_top, st; 1120 struct stat st_top, st;
644 char buf[_POSIX_PATH_MAX]; 1121 char buf[__PAX_UTILS_PATH_MAX];
645 size_t pathlen = 0, len = 0; 1122 size_t pathlen = 0, len = 0;
646 1123
647 /* make sure path exists */ 1124 /* make sure path exists */
648 if (lstat(path, &st_top) == -1) { 1125 if (lstat(path, &st_top) == -1) {
649 if (be_verbose > 2) printf("%s: does not exist\n", path); 1126 if (be_verbose > 2) printf("%s: does not exist\n", path);
659 /* now scan the dir looking for fun stuff */ 1136 /* now scan the dir looking for fun stuff */
660 if ((dir = opendir(path)) == NULL) { 1137 if ((dir = opendir(path)) == NULL) {
661 warnf("could not opendir %s: %s", path, strerror(errno)); 1138 warnf("could not opendir %s: %s", path, strerror(errno));
662 return; 1139 return;
663 } 1140 }
664 if (be_verbose) printf("%s: scanning dir\n", path); 1141 if (be_verbose > 1) printf("%s: scanning dir\n", path);
665 1142
666 pathlen = strlen(path); 1143 pathlen = strlen(path);
667 while ((dentry = readdir(dir))) { 1144 while ((dentry = readdir(dir))) {
668 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1145 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
669 continue; 1146 continue;
670 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1147 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
671 if (len >= sizeof(buf)) { 1148 if (len >= sizeof(buf)) {
672 warnf("Skipping '%s': len > sizeof(buf); %u > %u\n", path, len, sizeof(buf)); 1149 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1150 (unsigned long)len, (unsigned long)sizeof(buf));
673 continue; 1151 continue;
674 } 1152 }
675 sprintf(buf, "%s/%s", path, dentry->d_name); 1153 sprintf(buf, "%s/%s", path, dentry->d_name);
676 if (lstat(buf, &st) != -1) { 1154 if (lstat(buf, &st) != -1) {
677 if (S_ISREG(st.st_mode)) 1155 if (S_ISREG(st.st_mode))
687 1165
688static int scanelf_from_file(char *filename) 1166static int scanelf_from_file(char *filename)
689{ 1167{
690 FILE *fp = NULL; 1168 FILE *fp = NULL;
691 char *p; 1169 char *p;
692 char path[_POSIX_PATH_MAX]; 1170 char path[__PAX_UTILS_PATH_MAX];
693 1171
694 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1172 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
695 fp = stdin; 1173 fp = stdin;
696 else if ((fp = fopen(filename, "r")) == NULL) 1174 else if ((fp = fopen(filename, "r")) == NULL)
697 return 1; 1175 return 1;
698 1176
699 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1177 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
700 if ((p = strchr(path, '\n')) != NULL) 1178 if ((p = strchr(path, '\n')) != NULL)
701 *p = 0; 1179 *p = 0;
702 search_path = path; 1180 search_path = path;
703 scanelf_dir(path); 1181 scanelf_dir(path);
704 } 1182 }
709 1187
710static void load_ld_so_conf() 1188static void load_ld_so_conf()
711{ 1189{
712 FILE *fp = NULL; 1190 FILE *fp = NULL;
713 char *p; 1191 char *p;
714 char path[_POSIX_PATH_MAX]; 1192 char path[__PAX_UTILS_PATH_MAX];
715 int i = 0; 1193 int i = 0;
716 1194
717 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1195 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
718 return; 1196 return;
719 1197
720 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1198 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
721 if (*path != '/') 1199 if (*path != '/')
722 continue; 1200 continue;
723 1201
724 if ((p = strrchr(path, '\r')) != NULL) 1202 if ((p = strrchr(path, '\r')) != NULL)
725 *p = 0; 1203 *p = 0;
777 1255
778 free(path); 1256 free(path);
779} 1257}
780 1258
781 1259
782
783/* usage / invocation handling functions */ 1260/* usage / invocation handling functions */
784#define PARSE_FLAGS "plRmyxetrnibs:N:aqvF:f:o:BhV" 1261#define PARSE_FLAGS "plRmyAXxetrnLibSs:gN:TaqvF:f:o:E:BhV"
785#define a_argument required_argument 1262#define a_argument required_argument
786static struct option const long_opts[] = { 1263static struct option const long_opts[] = {
787 {"path", no_argument, NULL, 'p'}, 1264 {"path", no_argument, NULL, 'p'},
788 {"ldpath", no_argument, NULL, 'l'}, 1265 {"ldpath", no_argument, NULL, 'l'},
789 {"recursive", no_argument, NULL, 'R'}, 1266 {"recursive", no_argument, NULL, 'R'},
790 {"mount", no_argument, NULL, 'm'}, 1267 {"mount", no_argument, NULL, 'm'},
791 {"symlink", no_argument, NULL, 'y'}, 1268 {"symlink", no_argument, NULL, 'y'},
1269 {"archives", no_argument, NULL, 'A'},
1270 {"ldcache", no_argument, NULL, 'L'},
1271 {"fix", no_argument, NULL, 'X'},
792 {"pax", no_argument, NULL, 'x'}, 1272 {"pax", no_argument, NULL, 'x'},
793 {"header", no_argument, NULL, 'e'}, 1273 {"header", no_argument, NULL, 'e'},
794 {"textrel", no_argument, NULL, 't'}, 1274 {"textrel", no_argument, NULL, 't'},
795 {"rpath", no_argument, NULL, 'r'}, 1275 {"rpath", no_argument, NULL, 'r'},
796 {"needed", no_argument, NULL, 'n'}, 1276 {"needed", no_argument, NULL, 'n'},
797 {"interp", no_argument, NULL, 'i'}, 1277 {"interp", no_argument, NULL, 'i'},
798 {"bind", no_argument, NULL, 'b'}, 1278 {"bind", no_argument, NULL, 'b'},
1279 {"soname", no_argument, NULL, 'S'},
799 {"symbol", a_argument, NULL, 's'}, 1280 {"symbol", a_argument, NULL, 's'},
800 {"lib", a_argument, NULL, 'N'}, 1281 {"lib", a_argument, NULL, 'N'},
1282 {"gmatch", no_argument, NULL, 'g'},
1283 {"textrels", no_argument, NULL, 'T'},
1284 {"etype", a_argument, NULL, 'E'},
801 {"all", no_argument, NULL, 'a'}, 1285 {"all", no_argument, NULL, 'a'},
802 {"quiet", no_argument, NULL, 'q'}, 1286 {"quiet", no_argument, NULL, 'q'},
803 {"verbose", no_argument, NULL, 'v'}, 1287 {"verbose", no_argument, NULL, 'v'},
804 {"format", a_argument, NULL, 'F'}, 1288 {"format", a_argument, NULL, 'F'},
805 {"from", a_argument, NULL, 'f'}, 1289 {"from", a_argument, NULL, 'f'},
806 {"file", a_argument, NULL, 'o'}, 1290 {"file", a_argument, NULL, 'o'},
807 {"nobanner", no_argument, NULL, 'B'}, 1291 {"nobanner", no_argument, NULL, 'B'},
808 {"help", no_argument, NULL, 'h'}, 1292 {"help", no_argument, NULL, 'h'},
809 {"version", no_argument, NULL, 'V'}, 1293 {"version", no_argument, NULL, 'V'},
810 {NULL, no_argument, NULL, 0x0} 1294 {NULL, no_argument, NULL, 0x0}
811}; 1295};
813static const char *opts_help[] = { 1297static const char *opts_help[] = {
814 "Scan all directories in PATH environment", 1298 "Scan all directories in PATH environment",
815 "Scan all directories in /etc/ld.so.conf", 1299 "Scan all directories in /etc/ld.so.conf",
816 "Scan directories recursively", 1300 "Scan directories recursively",
817 "Don't recursively cross mount points", 1301 "Don't recursively cross mount points",
818 "Don't scan symlinks\n", 1302 "Don't scan symlinks",
1303 "Scan archives (.a files)",
1304 "Utilize ld.so.cache information (use with -r/-n)",
1305 "Try and 'fix' bad things (use with -r/-e)\n",
819 "Print PaX markings", 1306 "Print PaX markings",
820 "Print GNU_STACK/PT_LOAD markings", 1307 "Print GNU_STACK/PT_LOAD markings",
821 "Print TEXTREL information", 1308 "Print TEXTREL information",
822 "Print RPATH information", 1309 "Print RPATH information",
823 "Print NEEDED information", 1310 "Print NEEDED information",
824 "Print INTERP information", 1311 "Print INTERP information",
825 "Print BIND information", 1312 "Print BIND information",
1313 "Print SONAME information",
826 "Find a specified symbol", 1314 "Find a specified symbol",
827 "Find a specified library", 1315 "Find a specified library",
1316 "Use strncmp to match libraries. (use with -N)",
1317 "Locate cause of TEXTREL",
1318 "Print only ELF files matching numeric constant",
828 "Print all scanned info (-x -e -t -r -n -i -b)\n", 1319 "Print all scanned info (-x -e -t -r -b)\n",
829 "Only output 'bad' things", 1320 "Only output 'bad' things",
830 "Be verbose (can be specified more than once)", 1321 "Be verbose (can be specified more than once)",
831 "Use specified format for output", 1322 "Use specified format for output",
832 "Read input stream from a filename", 1323 "Read input stream from a filename",
833 "Write output stream to a filename", 1324 "Write output stream to a filename",
840/* display usage and exit */ 1331/* display usage and exit */
841static void usage(int status) 1332static void usage(int status)
842{ 1333{
843 unsigned long i; 1334 unsigned long i;
844 printf("* Scan ELF binaries for stuff\n\n" 1335 printf("* Scan ELF binaries for stuff\n\n"
845 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1336 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
846 printf("Options: -[%s]\n", PARSE_FLAGS); 1337 printf("Options: -[%s]\n", PARSE_FLAGS);
847 for (i = 0; long_opts[i].name; ++i) 1338 for (i = 0; long_opts[i].name; ++i)
848 if (long_opts[i].has_arg == no_argument) 1339 if (long_opts[i].has_arg == no_argument)
849 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 1340 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
850 long_opts[i].name, opts_help[i]); 1341 long_opts[i].name, opts_help[i]);
857 1348
858 puts("\nThe format modifiers for the -F option are:"); 1349 puts("\nThe format modifiers for the -F option are:");
859 puts(" F Filename \tx PaX Flags \te STACK/RELRO"); 1350 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
860 puts(" t TEXTREL \tr RPATH \tn NEEDED"); 1351 puts(" t TEXTREL \tr RPATH \tn NEEDED");
861 puts(" i INTERP \tb BIND \ts symbol"); 1352 puts(" i INTERP \tb BIND \ts symbol");
862 puts(" N library \to Type"); 1353 puts(" N library \to Type \tT TEXTRELs");
1354 puts(" S SONAME");
863 puts(" p filename (with search path removed)"); 1355 puts(" p filename (with search path removed)");
864 puts(" f base filename"); 1356 puts(" f filename (short name/basename)");
865 puts("Prefix each modifier with '%' (verbose) or '#' (silent)"); 1357 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
866 1358
867 exit(status); 1359 exit(status);
868} 1360}
869 1361
876 opterr = 0; 1368 opterr = 0;
877 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1369 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
878 switch (i) { 1370 switch (i) {
879 1371
880 case 'V': 1372 case 'V':
881 printf("%s compiled %s\n%s\n" 1373 printf("pax-utils-%s: %s compiled %s\n%s\n"
882 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 1374 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
883 __FILE__, __DATE__, rcsid, argv0); 1375 VERSION, __FILE__, __DATE__, rcsid, argv0);
884 exit(EXIT_SUCCESS); 1376 exit(EXIT_SUCCESS);
885 break; 1377 break;
886 case 'h': usage(EXIT_SUCCESS); break; 1378 case 'h': usage(EXIT_SUCCESS); break;
887 case 'f': 1379 case 'f':
888 if (from_file) err("Don't specify -f twice"); 1380 if (from_file) warn("You prob don't want to specify -f twice");
889 from_file = xstrdup(optarg); 1381 from_file = optarg;
1382 break;
1383 case 'E':
1384 strncpy(match_etypes, optarg, sizeof(match_etypes));
890 break; 1385 break;
891 case 'o': { 1386 case 'o': {
892 FILE *fp = NULL; 1387 FILE *fp = NULL;
893 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1388 if ((fp = freopen(optarg, "w", stdout)) == NULL)
894 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1389 err("Could not open output stream '%s': %s", optarg, strerror(errno));
895 SET_STDOUT(fp); 1390 SET_STDOUT(fp);
896 break; 1391 break;
897 } 1392 }
898 1393
899 case 's': { 1394 case 's': {
900 size_t len;
901 if (find_sym) err("Don't specify -s twice"); 1395 if (find_sym) warn("You prob don't want to specify -s twice");
902 find_sym = xstrdup(optarg); 1396 find_sym = optarg;
903 len = strlen(find_sym) + 1;
904 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1)); 1397 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
905 sprintf(versioned_symname, "%s@", find_sym); 1398 sprintf(versioned_symname, "%s@", find_sym);
906 break; 1399 break;
907 } 1400 }
908 case 'N': { 1401 case 'N': {
909 if (find_lib) err("Don't specify -N twice"); 1402 if (find_lib) warn("You prob don't want to specify -N twice");
910 find_lib = xstrdup(optarg); 1403 find_lib = optarg;
911 break; 1404 break;
912 } 1405 }
913 1406
914 case 'F': { 1407 case 'F': {
915 if (out_format) err("Don't specify -F twice"); 1408 if (out_format) warn("You prob don't want to specify -F twice");
916 out_format = xstrdup(optarg); 1409 out_format = optarg;
917 break; 1410 break;
918 } 1411 }
919 1412
1413 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */
1414 case 'L': use_ldcache = 1; break;
920 case 'y': scan_symlink = 0; break; 1415 case 'y': scan_symlink = 0; break;
1416 case 'A': scan_archives = 1; break;
921 case 'B': show_banner = 0; break; 1417 case 'B': show_banner = 0; break;
922 case 'l': scan_ldpath = 1; break; 1418 case 'l': scan_ldpath = 1; break;
923 case 'p': scan_envpath = 1; break; 1419 case 'p': scan_envpath = 1; break;
924 case 'R': dir_recurse = 1; break; 1420 case 'R': dir_recurse = 1; break;
925 case 'm': dir_crossmount = 0; break; 1421 case 'm': dir_crossmount = 0; break;
1422 case 'X': ++fix_elf; break;
926 case 'x': show_pax = 1; break; 1423 case 'x': show_pax = 1; break;
927 case 'e': show_phdr = 1; break; 1424 case 'e': show_phdr = 1; break;
928 case 't': show_textrel = 1; break; 1425 case 't': show_textrel = 1; break;
929 case 'r': show_rpath = 1; break; 1426 case 'r': show_rpath = 1; break;
930 case 'n': show_needed = 1; break; 1427 case 'n': show_needed = 1; break;
931 case 'i': show_interp = 1; break; 1428 case 'i': show_interp = 1; break;
932 case 'b': show_bind = 1; break; 1429 case 'b': show_bind = 1; break;
1430 case 'S': show_soname = 1; break;
1431 case 'T': show_textrels = 1; break;
933 case 'q': be_quiet = 1; break; 1432 case 'q': be_quiet = 1; break;
934 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1433 case 'v': be_verbose = (be_verbose % 20) + 1; break;
935 case 'a': show_pax = show_phdr = show_textrel = show_rpath = \ 1434 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
936 show_needed = show_interp = show_bind = 1; break;
937 1435
938 case ':': 1436 case ':':
939 err("Option missing parameter\n"); 1437 err("Option '%c' is missing parameter", optopt);
940 case '?': 1438 case '?':
941 err("Unknown option\n"); 1439 err("Unknown option '%c' or argument missing", optopt);
942 default: 1440 default:
943 err("Unhandled option '%c'", i); 1441 err("Unhandled option '%c'; please report this", i);
944 } 1442 }
945 } 1443 }
946 1444
947 /* let the format option override all other options */ 1445 /* let the format option override all other options */
948 if (out_format) { 1446 if (out_format) {
949 show_pax = show_phdr = show_textrel = show_rpath = \ 1447 show_pax = show_phdr = show_textrel = show_rpath = \
950 show_needed = show_interp = show_bind = 0; 1448 show_needed = show_interp = show_bind = show_soname = \
1449 show_textrels = 0;
951 for (i = 0; out_format[i]; ++i) { 1450 for (i = 0; out_format[i]; ++i) {
952 if (!IS_MODIFIER(out_format[i])) continue; 1451 if (!IS_MODIFIER(out_format[i])) continue;
953 1452
954 switch (out_format[++i]) { 1453 switch (out_format[++i]) {
955 case '%': break; 1454 case '%': break;
965 case 't': show_textrel = 1; break; 1464 case 't': show_textrel = 1; break;
966 case 'r': show_rpath = 1; break; 1465 case 'r': show_rpath = 1; break;
967 case 'n': show_needed = 1; break; 1466 case 'n': show_needed = 1; break;
968 case 'i': show_interp = 1; break; 1467 case 'i': show_interp = 1; break;
969 case 'b': show_bind = 1; break; 1468 case 'b': show_bind = 1; break;
1469 case 'S': show_soname = 1; break;
1470 case 'T': show_textrels = 1; break;
970 default: 1471 default:
971 err("Invalid format specifier '%c' (byte %i)", 1472 err("Invalid format specifier '%c' (byte %i)",
972 out_format[i], i+1); 1473 out_format[i], i+1);
973 } 1474 }
974 } 1475 }
975 1476
976 /* construct our default format */ 1477 /* construct our default format */
977 } else { 1478 } else {
978 size_t fmt_len = 30; 1479 size_t fmt_len = 30;
979 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 1480 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
980 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 1481 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
981 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 1482 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
982 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 1483 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
983 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 1484 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
984 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 1485 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
985 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 1486 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
986 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 1487 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
987 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 1488 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1489 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1490 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
988 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 1491 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
989 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 1492 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
990 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1493 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
991 } 1494 }
992 if (be_verbose > 2) printf("Format: %s\n", out_format); 1495 if (be_verbose > 2) printf("Format: %s\n", out_format);
993 1496
994 /* now lets actually do the scanning */ 1497 /* now lets actually do the scanning */
995 if (scan_ldpath || (show_rpath && be_quiet)) 1498 if (scan_ldpath || use_ldcache)
996 load_ld_so_conf(); 1499 load_ld_so_conf();
997 if (scan_ldpath) scanelf_ldpath(); 1500 if (scan_ldpath) scanelf_ldpath();
998 if (scan_envpath) scanelf_envpath(); 1501 if (scan_envpath) scanelf_envpath();
999 if (from_file) { 1502 if (from_file) {
1000 scanelf_from_file(from_file); 1503 scanelf_from_file(from_file);
1001 free(from_file);
1002 from_file = *argv; 1504 from_file = *argv;
1003 } 1505 }
1004 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 1506 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1005 err("Nothing to scan !?"); 1507 err("Nothing to scan !?");
1006 while (optind < argc) { 1508 while (optind < argc) {
1007 search_path = argv[optind++]; 1509 search_path = argv[optind++];
1008 scanelf_dir(search_path); 1510 scanelf_dir(search_path);
1009 } 1511 }
1010 1512
1011 /* clean up */ 1513 /* clean up */
1012 if (find_sym) { 1514 if (versioned_symname) free(versioned_symname);
1013 free(find_sym);
1014 free(versioned_symname);
1015 }
1016 if (find_lib) free(find_lib);
1017 if (out_format) free(out_format);
1018 for (i = 0; ldpaths[i]; ++i) 1515 for (i = 0; ldpaths[i]; ++i)
1019 free(ldpaths[i]); 1516 free(ldpaths[i]);
1517
1518 if (ldcache != 0)
1519 munmap(ldcache, ldcache_size);
1020} 1520}
1021 1521
1022 1522
1023 1523
1024/* utility funcs */ 1524/* utility funcs */
1026{ 1526{
1027 char *ret = strdup(s); 1527 char *ret = strdup(s);
1028 if (!ret) err("Could not strdup(): %s", strerror(errno)); 1528 if (!ret) err("Could not strdup(): %s", strerror(errno));
1029 return ret; 1529 return ret;
1030} 1530}
1031
1032static void *xmalloc(size_t size) 1531static void *xmalloc(size_t size)
1033{ 1532{
1034 void *ret = malloc(size); 1533 void *ret = malloc(size);
1035 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 1534 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1036 return ret; 1535 return ret;
1037} 1536}
1038
1039static void xstrcat(char **dst, const char *src, size_t *curr_len) 1537static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1040{ 1538{
1041 size_t new_len; 1539 size_t new_len;
1042 1540
1043 new_len = strlen(*dst) + strlen(src); 1541 new_len = strlen(*dst) + strlen(src);
1044 if (*curr_len <= new_len) { 1542 if (*curr_len <= new_len) {
1045 *curr_len = new_len + (*curr_len / 2); 1543 *curr_len = new_len + (*curr_len / 2);
1046 *dst = realloc(*dst, *curr_len); 1544 *dst = realloc(*dst, *curr_len);
1047 if (!*dst) 1545 if (!*dst)
1048 err("could not realloc %li bytes", (unsigned long)*curr_len); 1546 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1049 } 1547 }
1050 1548
1549 if (n)
1550 strncat(*dst, src, n);
1551 else
1051 strcat(*dst, src); 1552 strcat(*dst, src);
1052} 1553}
1053
1054static inline void xchrcat(char **dst, const char append, size_t *curr_len) 1554static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1055{ 1555{
1056 static char my_app[2]; 1556 static char my_app[2];
1057 my_app[0] = append; 1557 my_app[0] = append;
1058 my_app[1] = '\0'; 1558 my_app[1] = '\0';

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