/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.44 Revision 1.166
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 1.166 2006/12/11 03:31:54 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 1.166 2006/12/11 03:31:54 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;
68
69static char **qa_textrels = NULL;
70static char **qa_execstack = NULL;
71static char **qa_wx_load = NULL;
72
73int match_bits = 0;
74caddr_t ldcache = 0;
75size_t ldcache_size = 0;
76unsigned long setpax = 0UL;
73 77
74 78
75 79
76/* sub-funcs for scanelf_file() */ 80/* sub-funcs for scanelf_file() */
81static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
82{
83 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
84#define GET_SYMTABS(B) \
85 if (elf->elf_class == ELFCLASS ## B) { \
86 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
87 /* debug sections */ \
88 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
89 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
90 /* runtime sections */ \
91 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
92 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
93 if (symtab && dynsym) { \
94 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
95 } else { \
96 *sym = (void*)(symtab ? symtab : dynsym); \
97 } \
98 if (strtab && dynstr) { \
99 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
100 } else { \
101 *tab = (void*)(strtab ? strtab : dynstr); \
102 } \
103 }
104 GET_SYMTABS(32)
105 GET_SYMTABS(64)
106}
107
77static char *scanelf_file_pax(elfobj *elf, char *found_pax) 108static char *scanelf_file_pax(elfobj *elf, char *found_pax)
78{ 109{
79 static char *paxflags; 110 static char ret[7];
111 unsigned long i, shown;
80 112
81 if (!show_pax) return NULL; 113 if (!show_pax) return NULL;
82 114
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; 115 shown = 0;
100 strcpy(ret, "--- ---"); 116 memset(&ret, 0, sizeof(ret));
101 117
102 if (elf->phdr) { 118 if (elf->phdr) {
103#define SHOW_STACK(B) \ 119#define SHOW_PAX(B) \
104 if (elf->elf_class == ELFCLASS ## B) { \ 120 if (elf->elf_class == ELFCLASS ## B) { \
105 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 121 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
106 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 122 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
107 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 123 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
108 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 124 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; \ 125 continue; \
116 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ 126 if (fix_elf && setpax) { \
127 /* set the paxctl flags */ \
128 ESET(phdr[i].p_flags, setpax); \
129 } \
130 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
117 continue; \ 131 continue; \
118 memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \ 132 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
119 *found = 1; \ 133 *found_pax = 1; \
120 ++shown; \ 134 ++shown; \
135 break; \
121 } \ 136 } \
122 } 137 }
123 SHOW_STACK(32) 138 SHOW_PAX(32)
124 SHOW_STACK(64) 139 SHOW_PAX(64)
140 }
141
142
143 if (fix_elf && setpax) {
144 /* set the chpax settings */
145 if (elf->elf_class == ELFCLASS32) {
146 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
147 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
148 } else {
149 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
150 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
125 } 151 }
152 }
126 153
127 if (be_quiet && !shown) 154 /* fall back to EI_PAX if no PT_PAX was found */
155 if (!*ret) {
156 static char *paxflags;
157 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
158 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
159 *found_pax = 1;
160 return (be_wewy_wewy_quiet ? NULL : paxflags);
161 }
162 strncpy(ret, paxflags, sizeof(ret));
163 }
164
165 if (be_wewy_wewy_quiet || (be_quiet && !shown))
128 return NULL; 166 return NULL;
129 else 167 else
130 return ret; 168 return ret;
131} 169}
170
171static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
172{
173 static char ret[12];
174 char *found;
175 unsigned long i, shown, multi_stack, multi_relro, multi_load;
176 int max_pt_load;
177
178 if (!show_phdr) return NULL;
179
180 memcpy(ret, "--- --- ---\0", 12);
181
182 shown = 0;
183 multi_stack = multi_relro = multi_load = 0;
184 max_pt_load = elf_max_pt_load(elf);
185
186#define NOTE_GNU_STACK ".note.GNU-stack"
187#define SHOW_PHDR(B) \
188 if (elf->elf_class == ELFCLASS ## B) { \
189 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
190 Elf ## B ## _Off offset; \
191 uint32_t flags, check_flags; \
192 if (elf->phdr != NULL) { \
193 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
194 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
195 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
196 if (multi_stack++) \
197 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
198 if (file_matches_list(elf->filename, qa_execstack)) \
199 continue; \
200 found = found_phdr; \
201 offset = 0; \
202 check_flags = PF_X; \
203 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
204 if (multi_relro++) \
205 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
206 found = found_relro; \
207 offset = 4; \
208 check_flags = PF_X; \
209 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
210 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
211 if (multi_load++ > max_pt_load) \
212 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
213 if (file_matches_list(elf->filename, qa_wx_load)) \
214 continue; \
215 found = found_load; \
216 offset = 8; \
217 check_flags = PF_W|PF_X; \
218 } else \
219 continue; \
220 flags = EGET(phdr[i].p_flags); \
221 if (be_quiet && ((flags & check_flags) != check_flags)) \
222 continue; \
223 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
224 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
225 ret[3] = ret[7] = '!'; \
226 flags = EGET(phdr[i].p_flags); \
227 } \
228 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
229 *found = 1; \
230 ++shown; \
231 } \
232 } else if (elf->shdr != NULL) { \
233 /* no program headers which means this is prob an object file */ \
234 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
235 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
236 char *str; \
237 if ((void*)strtbl > (void*)elf->data_end) \
238 goto skip_this_shdr##B; \
239 check_flags = SHF_WRITE|SHF_EXECINSTR; \
240 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
241 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
242 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
243 str = elf->data + offset; \
244 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
245 if (!strcmp(str, NOTE_GNU_STACK)) { \
246 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
247 flags = EGET(shdr[i].sh_flags); \
248 if (be_quiet && ((flags & check_flags) != check_flags)) \
249 continue; \
250 ++*found_phdr; \
251 shown = 1; \
252 if (flags & SHF_WRITE) ret[0] = 'W'; \
253 if (flags & SHF_ALLOC) ret[1] = 'A'; \
254 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
255 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
256 break; \
257 } \
258 } \
259 skip_this_shdr##B: \
260 if (!multi_stack) { \
261 if (file_matches_list(elf->filename, qa_execstack)) \
262 return NULL; \
263 *found_phdr = 1; \
264 shown = 1; \
265 memcpy(ret, "!WX", 3); \
266 } \
267 } \
268 }
269 SHOW_PHDR(32)
270 SHOW_PHDR(64)
271
272 if (be_wewy_wewy_quiet || (be_quiet && !shown))
273 return NULL;
274 else
275 return ret;
276}
277
132static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 278static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
133{ 279{
134 static char *ret = "TEXTREL"; 280 static const char *ret = "TEXTREL";
135 unsigned long i; 281 unsigned long i;
136 282
137 if (!show_textrel) return NULL; 283 if (!show_textrel && !show_textrels) return NULL;
284
285 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
138 286
139 if (elf->phdr) { 287 if (elf->phdr) {
140#define SHOW_TEXTREL(B) \ 288#define SHOW_TEXTREL(B) \
141 if (elf->elf_class == ELFCLASS ## B) { \ 289 if (elf->elf_class == ELFCLASS ## B) { \
142 Elf ## B ## _Dyn *dyn; \ 290 Elf ## B ## _Dyn *dyn; \
143 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 291 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
144 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 292 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
145 Elf ## B ## _Off offset; \ 293 Elf ## B ## _Off offset; \
146 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 294 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
147 if (phdr[i].p_type != PT_DYNAMIC) continue; \ 295 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
148 offset = EGET(phdr[i].p_offset); \ 296 offset = EGET(phdr[i].p_offset); \
149 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 297 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
150 dyn = DYN ## B (elf->data + offset); \ 298 dyn = DYN ## B (elf->data + offset); \
151 while (EGET(dyn->d_tag) != DT_NULL) { \ 299 while (EGET(dyn->d_tag) != DT_NULL) { \
152 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 300 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
153 *found_textrel = 1; \ 301 *found_textrel = 1; \
154 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 302 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
155 return ret; \ 303 return (be_wewy_wewy_quiet ? NULL : ret); \
156 } \ 304 } \
157 ++dyn; \ 305 ++dyn; \
158 } \ 306 } \
159 } } 307 } }
160 SHOW_TEXTREL(32) 308 SHOW_TEXTREL(32)
161 SHOW_TEXTREL(64) 309 SHOW_TEXTREL(64)
162 } 310 }
163 311
164 if (be_quiet) 312 if (be_quiet || be_wewy_wewy_quiet)
165 return NULL; 313 return NULL;
166 else 314 else
167 return " - "; 315 return " - ";
168} 316}
317static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
318{
319 unsigned long s, r, rmax;
320 void *symtab_void, *strtab_void, *text_void;
321
322 if (!show_textrels) return NULL;
323
324 /* don't search for TEXTREL's if the ELF doesn't have any */
325 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
326 if (!*found_textrel) return NULL;
327
328 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
329 text_void = elf_findsecbyname(elf, ".text");
330
331 if (symtab_void && strtab_void && text_void && elf->shdr) {
332#define SHOW_TEXTRELS(B) \
333 if (elf->elf_class == ELFCLASS ## B) { \
334 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
335 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
336 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
337 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
338 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
339 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
340 uint ## B ## _t memsz = EGET(text->sh_size); \
341 Elf ## B ## _Rel *rel; \
342 Elf ## B ## _Rela *rela; \
343 /* search the section headers for relocations */ \
344 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
345 uint32_t sh_type = EGET(shdr[s].sh_type); \
346 if (sh_type == SHT_REL) { \
347 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
348 rela = NULL; \
349 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
350 } else if (sh_type == SHT_RELA) { \
351 rel = NULL; \
352 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
353 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
354 } else \
355 continue; \
356 /* now see if any of the relocs are in the .text */ \
357 for (r = 0; r < rmax; ++r) { \
358 unsigned long sym_max; \
359 Elf ## B ## _Addr offset_tmp; \
360 Elf ## B ## _Sym *func; \
361 Elf ## B ## _Sym *sym; \
362 Elf ## B ## _Addr r_offset; \
363 uint ## B ## _t r_info; \
364 if (sh_type == SHT_REL) { \
365 r_offset = EGET(rel[r].r_offset); \
366 r_info = EGET(rel[r].r_info); \
367 } else { \
368 r_offset = EGET(rela[r].r_offset); \
369 r_info = EGET(rela[r].r_info); \
370 } \
371 /* make sure this relocation is inside of the .text */ \
372 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
373 if (be_verbose <= 2) continue; \
374 } else \
375 *found_textrels = 1; \
376 /* locate this relocation symbol name */ \
377 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
378 if ((void*)sym > (void*)elf->data_end) { \
379 warn("%s: corrupt ELF symbol", elf->filename); \
380 continue; \
381 } \
382 sym_max = ELF ## B ## _R_SYM(r_info); \
383 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
384 sym += sym_max; \
385 else \
386 sym = NULL; \
387 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
388 /* show the raw details about this reloc */ \
389 printf(" %s: ", elf->base_filename); \
390 if (sym && sym->st_name) \
391 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
392 else \
393 printf("(memory/fake?)"); \
394 printf(" [0x%lX]", (unsigned long)r_offset); \
395 /* now try to find the closest symbol that this rel is probably in */ \
396 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
397 func = NULL; \
398 offset_tmp = 0; \
399 while (sym_max--) { \
400 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
401 func = sym; \
402 offset_tmp = EGET(sym->st_value); \
403 } \
404 ++sym; \
405 } \
406 printf(" in "); \
407 if (func && func->st_name) \
408 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
409 else \
410 printf("(NULL: fake?)"); \
411 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
412 } \
413 } }
414 SHOW_TEXTRELS(32)
415 SHOW_TEXTRELS(64)
416 }
417 if (!*found_textrels)
418 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
419
420 return NULL;
421}
422
423static void rpath_security_checks(elfobj *, char *, const char *);
424static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
425{
426 struct stat st;
427 switch (*item) {
428 case '/': break;
429 case '.':
430 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
431 break;
432 case ':':
433 case '\0':
434 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
435 break;
436 case '$':
437 if (fstat(elf->fd, &st) != -1)
438 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
439 warnf("Security problem with %s='%s' in %s with mode set of %o",
440 dt_type, item, elf->filename, st.st_mode & 07777);
441 break;
442 default:
443 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
444 break;
445 }
446}
169static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 447static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
170{ 448{
171 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */
172 unsigned long i; 449 unsigned long i, s;
173 char *rpath, *runpath; 450 char *rpath, *runpath, **r;
174 void *strtbl_void; 451 void *strtbl_void;
175 452
176 if (!show_rpath) return; 453 if (!show_rpath) return;
177 454
178 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 455 strtbl_void = elf_findsecbyname(elf, ".dynstr");
184 Elf ## B ## _Dyn *dyn; \ 461 Elf ## B ## _Dyn *dyn; \
185 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 462 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
186 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 463 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
187 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 464 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
188 Elf ## B ## _Off offset; \ 465 Elf ## B ## _Off offset; \
466 Elf ## B ## _Xword word; \
467 /* Scan all the program headers */ \
189 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 468 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
469 /* Just scan dynamic headers */ \
190 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 470 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
191 offset = EGET(phdr[i].p_offset); \ 471 offset = EGET(phdr[i].p_offset); \
192 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 472 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
473 /* Just scan dynamic RPATH/RUNPATH headers */ \
193 dyn = DYN ## B (elf->data + offset); \ 474 dyn = DYN ## B (elf->data + offset); \
194 while (EGET(dyn->d_tag) != DT_NULL) { \ 475 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
195 if (EGET(dyn->d_tag) == DT_RPATH) { \ 476 if (word == DT_RPATH) { \
196 if (rpath) warn("ELF has multiple DT_RPATH's !?"); \ 477 r = &rpath; \
478 } else if (word == DT_RUNPATH) { \
479 r = &runpath; \
480 } else { \
481 ++dyn; \
482 continue; \
483 } \
484 /* Verify the memory is somewhat sane */ \
197 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 485 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
198 if (offset >= elf->len) continue; \ 486 if (offset < (Elf ## B ## _Off)elf->len) { \
487 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
199 rpath = (char*)(elf->data + offset); \ 488 *r = (char*)(elf->data + offset); \
489 /* cache the length in case we need to nuke this section later on */ \
490 if (fix_elf) \
491 offset = strlen(*r); \
492 /* If quiet, don't output paths in ld.so.conf */ \
493 if (be_quiet) { \
494 size_t len; \
495 char *start, *end; \
496 /* note that we only 'chop' off leading known paths. */ \
497 /* since *r is read-only memory, we can only move the ptr forward. */ \
498 start = *r; \
499 /* scan each path in : delimited list */ \
500 while (start) { \
501 rpath_security_checks(elf, start, get_elfdtype(word)); \
502 end = strchr(start, ':'); \
503 len = (end ? abs(end - start) : strlen(start)); \
504 if (use_ldcache) \
505 for (s = 0; ldpaths[s]; ++s) \
506 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
507 *r = end; \
508 /* corner case ... if RPATH reads "/usr/lib:", we want \
509 * to show ':' rather than '' */ \
510 if (end && end[1] != '\0') \
511 (*r)++; \
512 break; \
513 } \
514 if (!*r || !end) \
515 break; \
516 else \
517 start = start + len + 1; \
518 } \
519 } \
520 if (*r) { \
521 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
522 /* just nuke it */ \
523 nuke_it##B: \
524 memset(*r, 0x00, offset); \
525 *r = NULL; \
526 ESET(dyn->d_tag, DT_DEBUG); \
527 ESET(dyn->d_un.d_ptr, 0); \
528 } else if (fix_elf) { \
529 /* try to clean "bad" paths */ \
530 size_t len, tmpdir_len; \
531 char *start, *end; \
532 const char *tmpdir; \
533 start = *r; \
534 tmpdir = (getenv("TMPDIR") ? : "."); \
535 tmpdir_len = strlen(tmpdir); \
536 while (1) { \
537 end = strchr(start, ':'); \
538 if (start == end) { \
539 eat_this_path##B: \
540 len = strlen(end); \
541 memmove(start, end+1, len); \
542 start[len-1] = '\0'; \
543 end = start - 1; \
544 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
545 if (!end) { \
546 if (start == *r) \
547 goto nuke_it##B; \
548 *--start = '\0'; \
549 } else \
550 goto eat_this_path##B; \
551 } \
552 if (!end) \
553 break; \
554 start = end + 1; \
555 } \
556 if (**r == '\0') \
557 goto nuke_it##B; \
558 } \
559 if (*r) \
200 *found_rpath = 1; \ 560 *found_rpath = 1; \
201 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \ 561 } \
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 } \ 562 } \
208 ++dyn; \ 563 ++dyn; \
209 } \ 564 } \
210 } } 565 } }
211 SHOW_RPATH(32) 566 SHOW_RPATH(32)
212 SHOW_RPATH(64) 567 SHOW_RPATH(64)
213 } 568 }
569
570 if (be_wewy_wewy_quiet) return;
214 571
215 if (rpath && runpath) { 572 if (rpath && runpath) {
216 if (!strcmp(rpath, runpath)) { 573 if (!strcmp(rpath, runpath)) {
217 xstrcat(ret, runpath, ret_len); 574 xstrcat(ret, runpath, ret_len);
218 } else { 575 } else {
226 } else if (rpath || runpath) 583 } else if (rpath || runpath)
227 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 584 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
228 else if (!be_quiet) 585 else if (!be_quiet)
229 xstrcat(ret, " - ", ret_len); 586 xstrcat(ret, " - ", ret_len);
230} 587}
588
589#define LDSO_CACHE_MAGIC "ld.so-"
590#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
591#define LDSO_CACHE_VER "1.7.0"
592#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
593#define FLAG_ANY -1
594#define FLAG_TYPE_MASK 0x00ff
595#define FLAG_LIBC4 0x0000
596#define FLAG_ELF 0x0001
597#define FLAG_ELF_LIBC5 0x0002
598#define FLAG_ELF_LIBC6 0x0003
599#define FLAG_REQUIRED_MASK 0xff00
600#define FLAG_SPARC_LIB64 0x0100
601#define FLAG_IA64_LIB64 0x0200
602#define FLAG_X8664_LIB64 0x0300
603#define FLAG_S390_LIB64 0x0400
604#define FLAG_POWERPC_LIB64 0x0500
605#define FLAG_MIPS64_LIBN32 0x0600
606#define FLAG_MIPS64_LIBN64 0x0700
607
608static char *lookup_cache_lib(elfobj *, char *);
609
610#if defined(__GLIBC__) || defined(__UCLIBC__)
611
612static char *lookup_cache_lib(elfobj *elf, char *fname)
613{
614 int fd = 0;
615 char *strs;
616 static char buf[__PAX_UTILS_PATH_MAX] = "";
617 const char *cachefile = "/etc/ld.so.cache";
618 struct stat st;
619
620 typedef struct {
621 char magic[LDSO_CACHE_MAGIC_LEN];
622 char version[LDSO_CACHE_VER_LEN];
623 int nlibs;
624 } header_t;
625 header_t *header;
626
627 typedef struct {
628 int flags;
629 int sooffset;
630 int liboffset;
631 } libentry_t;
632 libentry_t *libent;
633
634 if (fname == NULL)
635 return NULL;
636
637 if (ldcache == 0) {
638 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
639 return NULL;
640
641 /* cache these values so we only map/unmap the cache file once */
642 ldcache_size = st.st_size;
643 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
644
645 close(fd);
646
647 if (ldcache == (caddr_t)-1) {
648 ldcache = 0;
649 return NULL;
650 }
651
652 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
653 return NULL;
654 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
655 return NULL;
656 }
657
658 header = (header_t *) ldcache;
659 libent = (libentry_t *) (ldcache + sizeof(header_t));
660 strs = (char *) &libent[header->nlibs];
661
662 for (fd = 0; fd < header->nlibs; fd++) {
663 /* this should be more fine grained, but for now we assume that
664 * diff arches will not be cached together. and we ignore the
665 * the different multilib mips cases. */
666 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
667 continue;
668 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
669 continue;
670
671 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
672 continue;
673 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
674 }
675 return buf;
676}
677#elif defined(__NetBSD__)
678static char *lookup_cache_lib(elfobj *elf, char *fname)
679{
680 static char buf[__PAX_UTILS_PATH_MAX] = "";
681 static struct stat st;
682
683 char **ldpath;
684 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
685 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
686 continue; /* if the pathname is too long, or something went wrong, ignore */
687
688 if (stat(buf, &st) != 0)
689 continue; /* if the lib doesn't exist in *ldpath, look further */
690
691 /* NetBSD doesn't actually do sanity checks, it just loads the file
692 * and if that doesn't work, continues looking in other directories.
693 * This cannot easily be safely emulated, unfortunately. For now,
694 * just assume that if it exists, it's a valid library. */
695
696 return buf;
697 }
698
699 /* not found in any path */
700 return NULL;
701}
702#else
703#warning Cache support not implemented for your target
704static char *lookup_cache_lib(elfobj *elf, char *fname)
705{
706 return NULL;
707}
708#endif
709
231static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len) 710static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
232{ 711{
233 unsigned long i; 712 unsigned long i;
234 char *needed; 713 char *needed;
235 void *strtbl_void; 714 void *strtbl_void;
715 char *p;
236 716
237 if (!show_needed) return; 717 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
238 718
239 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 719 strtbl_void = elf_findsecbyname(elf, ".dynstr");
240 720
241 if (elf->phdr && strtbl_void) { 721 if (elf->phdr && strtbl_void) {
242#define SHOW_NEEDED(B) \ 722#define SHOW_NEEDED(B) \
252 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 732 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
253 dyn = DYN ## B (elf->data + offset); \ 733 dyn = DYN ## B (elf->data + offset); \
254 while (EGET(dyn->d_tag) != DT_NULL) { \ 734 while (EGET(dyn->d_tag) != DT_NULL) { \
255 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 735 if (EGET(dyn->d_tag) == DT_NEEDED) { \
256 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 736 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
257 if (offset >= elf->len) continue; \ 737 if (offset >= (Elf ## B ## _Off)elf->len) { \
738 ++dyn; \
739 continue; \
740 } \
258 needed = (char*)(elf->data + offset); \ 741 needed = (char*)(elf->data + offset); \
742 if (op == 0) { \
743 if (!be_wewy_wewy_quiet) { \
259 if (*found_needed) xchrcat(ret, ',', ret_len); \ 744 if (*found_needed) xchrcat(ret, ',', ret_len); \
745 if (use_ldcache) \
746 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
747 needed = p; \
260 xstrcat(ret, needed, ret_len); \ 748 xstrcat(ret, needed, ret_len); \
749 } \
261 *found_needed = 1; \ 750 *found_needed = 1; \
751 } else { \
752 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
753 *found_lib = 1; \
754 return (be_wewy_wewy_quiet ? NULL : needed); \
755 } \
756 } \
262 } \ 757 } \
263 ++dyn; \ 758 ++dyn; \
264 } \ 759 } \
265 } } 760 } }
266 SHOW_NEEDED(32) 761 SHOW_NEEDED(32)
267 SHOW_NEEDED(64) 762 SHOW_NEEDED(64)
763 if (op == 0 && !*found_needed && be_verbose)
764 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
268 } 765 }
766
767 return NULL;
269} 768}
270static char *scanelf_file_interp(elfobj *elf, char *found_interp) 769static char *scanelf_file_interp(elfobj *elf, char *found_interp)
271{ 770{
272 void *strtbl_void; 771 void *strtbl_void;
273 772
278 if (strtbl_void) { 777 if (strtbl_void) {
279#define SHOW_INTERP(B) \ 778#define SHOW_INTERP(B) \
280 if (elf->elf_class == ELFCLASS ## B) { \ 779 if (elf->elf_class == ELFCLASS ## B) { \
281 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 780 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
282 *found_interp = 1; \ 781 *found_interp = 1; \
283 return elf->data + EGET(strtbl->sh_offset); \ 782 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
284 } 783 }
285 SHOW_INTERP(32) 784 SHOW_INTERP(32)
286 SHOW_INTERP(64) 785 SHOW_INTERP(64)
287 } 786 }
288 return NULL; 787 return NULL;
289} 788}
290static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename) 789static char *scanelf_file_bind(elfobj *elf, char *found_bind)
291{ 790{
292 unsigned long i; 791 unsigned long i;
792 struct stat s;
793 char dynamic = 0;
794
795 if (!show_bind) return NULL;
796 if (!elf->phdr) return NULL;
797
798#define SHOW_BIND(B) \
799 if (elf->elf_class == ELFCLASS ## B) { \
800 Elf ## B ## _Dyn *dyn; \
801 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
802 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
803 Elf ## B ## _Off offset; \
804 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
805 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
806 dynamic = 1; \
807 offset = EGET(phdr[i].p_offset); \
808 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
809 dyn = DYN ## B (elf->data + offset); \
810 while (EGET(dyn->d_tag) != DT_NULL) { \
811 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
812 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
813 { \
814 if (be_quiet) return NULL; \
815 *found_bind = 1; \
816 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
817 } \
818 ++dyn; \
819 } \
820 } \
821 }
822 SHOW_BIND(32)
823 SHOW_BIND(64)
824
825 if (be_wewy_wewy_quiet) return NULL;
826
827 /* don't output anything if quiet mode and the ELF is static or not setuid */
828 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
829 return NULL;
830 } else {
831 *found_bind = 1;
832 return (char *) (dynamic ? "LAZY" : "STATIC");
833 }
834}
835static char *scanelf_file_soname(elfobj *elf, char *found_soname)
836{
837 unsigned long i;
838 char *soname;
839 void *strtbl_void;
840
841 if (!show_soname) return NULL;
842
843 strtbl_void = elf_findsecbyname(elf, ".dynstr");
844
845 if (elf->phdr && strtbl_void) {
846#define SHOW_SONAME(B) \
847 if (elf->elf_class == ELFCLASS ## B) { \
848 Elf ## B ## _Dyn *dyn; \
849 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
850 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
851 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
852 Elf ## B ## _Off offset; \
853 /* only look for soname in shared objects */ \
854 if (ehdr->e_type != ET_DYN) \
855 return NULL; \
856 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
857 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
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_SONAME) { \
863 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
864 if (offset >= (Elf ## B ## _Off)elf->len) { \
865 ++dyn; \
866 continue; \
867 } \
868 soname = (char*)(elf->data + offset); \
869 *found_soname = 1; \
870 return (be_wewy_wewy_quiet ? NULL : soname); \
871 } \
872 ++dyn; \
873 } \
874 } }
875 SHOW_SONAME(32)
876 SHOW_SONAME(64)
877 }
878
879 return NULL;
880}
881static char *scanelf_file_sym(elfobj *elf, char *found_sym)
882{
883 unsigned long i;
884 char *ret;
293 void *symtab_void, *strtab_void; 885 void *symtab_void, *strtab_void;
294 886
295 if (!find_sym) return NULL; 887 if (!find_sym) return NULL;
888 ret = find_sym;
296 889
297 symtab_void = elf_findsecbyname(elf, ".symtab"); 890 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
298 strtab_void = elf_findsecbyname(elf, ".strtab");
299 891
300 if (symtab_void && strtab_void) { 892 if (symtab_void && strtab_void) {
301#define FIND_SYM(B) \ 893#define FIND_SYM(B) \
302 if (elf->elf_class == ELFCLASS ## B) { \ 894 if (elf->elf_class == ELFCLASS ## B) { \
303 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 895 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
304 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 896 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
305 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 897 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
306 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 898 unsigned long cnt = EGET(symtab->sh_entsize); \
307 char *symname; \ 899 char *symname; \
900 if (cnt) \
901 cnt = EGET(symtab->sh_size) / cnt; \
308 for (i = 0; i < cnt; ++i) { \ 902 for (i = 0; i < cnt; ++i) { \
309 if (sym->st_name) { \ 903 if (sym->st_name) { \
904 /* make sure the symbol name is in acceptable memory range */ \
310 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 905 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
906 if ((void*)symname > (void*)elf->data_end) { \
907 warnf("%s: corrupt ELF symbols", elf->filename); \
908 ++sym; \
909 continue; \
910 } \
911 /* debug display ... show all symbols and some extra info */ \
311 if (*find_sym == '*') { \ 912 if (*ret == '*') { \
312 printf("%s(%s) %5lX %15s %s\n", \ 913 printf("%s(%s) %5lX %15s %s\n", \
313 ((*found_sym == 0) ? "\n\t" : "\t"), \ 914 ((*found_sym == 0) ? "\n\t" : "\t"), \
314 (char *)basename(filename), \ 915 elf->base_filename, \
315 (long)sym->st_size, \ 916 (unsigned long)sym->st_size, \
316 (char *)get_elfstttype(sym->st_info), \ 917 get_elfstttype(sym->st_info), \
317 symname); \ 918 symname); \
318 *found_sym = 1; \ 919 *found_sym = 1; \
319 } else if ((strcmp(find_sym, symname) == 0) || \ 920 } else { \
320 (strcmp(symname, versioned_symname) == 0)) \ 921 /* allow the user to specify a comma delimited list of symbols to search for */ \
922 char *this_sym, *this_sym_ver, *next_sym; \
923 this_sym = ret; \
924 this_sym_ver = versioned_symname; \
925 do { \
926 next_sym = strchr(this_sym, ','); \
927 if (next_sym == NULL) \
928 next_sym = this_sym + strlen(this_sym); \
929 /* do we want a defined symbol ? */ \
930 if (*this_sym == '+') { \
931 if (sym->st_shndx == SHN_UNDEF) \
932 goto skip_this_sym##B; \
933 ++this_sym; \
934 ++this_sym_ver; \
935 /* do we want an undefined symbol ? */ \
936 } else if (*this_sym == '-') { \
937 if (sym->st_shndx != SHN_UNDEF) \
938 goto skip_this_sym##B; \
939 ++this_sym; \
940 ++this_sym_ver; \
941 } \
942 /* ok, lets compare the name now */ \
943 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
944 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
945 if (be_semi_verbose) { \
946 char buf[126]; \
947 snprintf(buf, sizeof(buf), "%lX %s %s", \
948 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
949 ret = buf; \
950 } else \
951 ret = this_sym; \
321 (*found_sym)++; \ 952 (*found_sym)++; \
953 goto break_out; \
954 } \
955 skip_this_sym##B: this_sym = next_sym + 1; \
956 } while (*next_sym != '\0'); \
957 } \
322 } \ 958 } \
323 ++sym; \ 959 ++sym; \
324 } } 960 } }
325 FIND_SYM(32) 961 FIND_SYM(32)
326 FIND_SYM(64) 962 FIND_SYM(64)
327 } 963 }
964
965break_out:
966 if (be_wewy_wewy_quiet) return NULL;
967
328 if (*find_sym != '*' && *found_sym) 968 if (*find_sym != '*' && *found_sym)
329 return find_sym; 969 return ret;
330 if (be_quiet) 970 if (be_quiet)
331 return NULL; 971 return NULL;
332 else 972 else
333 return " - "; 973 return (char *)" - ";
334} 974}
975
976
977static char *scanelf_file_sections(elfobj *elf, char *found_section)
978{
979 if (!find_section)
980 return NULL;
981
982#define FIND_SECTION(B) \
983 if (elf->elf_class == ELFCLASS ## B) { \
984 int invert; \
985 Elf ## B ## _Shdr *section; \
986 invert = (*find_section == '!' ? 1 : 0); \
987 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
988 if ((section == NULL && invert) || (section != NULL && !invert)) \
989 *found_section = 1; \
990 }
991 FIND_SECTION(32)
992 FIND_SECTION(64)
993
994 if (be_wewy_wewy_quiet)
995 return NULL;
996
997 if (*found_section)
998 return find_section;
999
1000 if (be_quiet)
1001 return NULL;
1002 else
1003 return (char *)" - ";
1004}
1005
335/* scan an elf file and show all the fun stuff */ 1006/* scan an elf file and show all the fun stuff */
336#define prints(str) fputs(str, stdout) 1007#define prints(str) write(fileno(stdout), str, strlen(str))
337static void scanelf_file(const char *filename) 1008static int scanelf_elfobj(elfobj *elf)
338{ 1009{
339 unsigned long i; 1010 unsigned long i;
340 char found_pax, found_stack, found_relro, found_textrel, 1011 char found_pax, found_phdr, found_relro, found_load, found_textrel,
341 found_rpath, found_needed, found_interp, found_sym, 1012 found_rpath, found_needed, found_interp, found_bind, found_soname,
342 found_file; 1013 found_sym, found_lib, found_file, found_textrels, found_section;
343 elfobj *elf;
344 struct stat st;
345 static char *out_buffer = NULL; 1014 static char *out_buffer = NULL;
346 static size_t out_len; 1015 static size_t out_len;
347 1016
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 = \ 1017 found_pax = found_phdr = found_relro = found_load = found_textrel = \
360 found_rpath = found_needed = found_interp = found_sym = \ 1018 found_rpath = found_needed = found_interp = found_bind = found_soname = \
361 found_file = 0; 1019 found_sym = found_lib = found_file = found_textrels = found_section = 0;
362 1020
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) 1021 if (be_verbose > 2)
370 printf("%s: scanning file {%s,%s}\n", filename, 1022 printf("%s: scanning file {%s,%s}\n", elf->filename,
371 get_elfeitype(elf, EI_CLASS, elf->elf_class), 1023 get_elfeitype(EI_CLASS, elf->elf_class),
372 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA])); 1024 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
373 else if (be_verbose) 1025 else if (be_verbose > 1)
374 printf("%s: scanning file\n", filename); 1026 printf("%s: scanning file\n", elf->filename);
375 1027
376 /* init output buffer */ 1028 /* init output buffer */
377 if (!out_buffer) { 1029 if (!out_buffer) {
378 out_len = sizeof(char) * 80; 1030 out_len = sizeof(char) * 80;
379 out_buffer = (char*)xmalloc(out_len); 1031 out_buffer = (char*)xmalloc(out_len);
380 } 1032 }
381 *out_buffer = '\0'; 1033 *out_buffer = '\0';
382 1034
383 /* show the header */ 1035 /* show the header */
384 if (!be_quiet && show_banner) { 1036 if (!be_quiet && show_banner) {
385 for (i=0; out_format[i]; ++i) { 1037 for (i = 0; out_format[i]; ++i) {
386 if (out_format[i] != '%') continue; 1038 if (!IS_MODIFIER(out_format[i])) continue;
387 1039
388 switch (out_format[++i]) { 1040 switch (out_format[++i]) {
1041 case '+': break;
389 case '%': break; 1042 case '%': break;
1043 case '#': break;
1044 case 'F':
1045 case 'p':
390 case 'F': prints("FILE "); break; 1046 case 'f': prints("FILE "); found_file = 1; break;
391 case 'o': prints(" TYPE "); break; 1047 case 'o': prints(" TYPE "); break;
392 case 'x': prints(" PAX "); break; 1048 case 'x': prints(" PAX "); break;
393 case 'e': prints("STK/REL "); break; 1049 case 'e': prints("STK/REL/PTL "); break;
394 case 't': prints("TEXTREL "); break; 1050 case 't': prints("TEXTREL "); break;
395 case 'r': prints("RPATH "); break; 1051 case 'r': prints("RPATH "); break;
396 case 'n': prints("NEEDED "); break; 1052 case 'n': prints("NEEDED "); break;
397 case 'i': prints("INTERP "); break; 1053 case 'i': prints("INTERP "); break;
1054 case 'b': prints("BIND "); break;
1055 case 'S': prints("SONAME "); break;
398 case 's': prints("SYM "); break; 1056 case 's': prints("SYM "); break;
1057 case 'N': prints("LIB "); break;
1058 case 'T': prints("TEXTRELS "); break;
1059 case 'k': prints("SECTION "); break;
1060 case 'a': prints("ARCH "); break;
1061 default: warnf("'%c' has no title ?", out_format[i]);
399 } 1062 }
400 } 1063 }
1064 if (!found_file) prints("FILE ");
401 prints("\n"); 1065 prints("\n");
1066 found_file = 0;
402 show_banner = 0; 1067 show_banner = 0;
403 } 1068 }
404 1069
405 /* dump all the good stuff */ 1070 /* dump all the good stuff */
406 for (i=0; out_format[i]; ++i) { 1071 for (i = 0; out_format[i]; ++i) {
407 const char *out; 1072 const char *out;
1073 const char *tmp;
408 1074
409 /* make sure we trim leading spaces in quiet mode */ 1075 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); 1076 xchrcat(&out_buffer, out_format[i], &out_len);
415 continue; 1077 continue;
416 } 1078 }
417 1079
418 out = NULL; 1080 out = NULL;
1081 be_wewy_wewy_quiet = (out_format[i] == '#');
1082 be_semi_verbose = (out_format[i] == '+');
419 switch (out_format[++i]) { 1083 switch (out_format[++i]) {
1084 case '+':
1085 case '%':
1086 case '#':
420 case '%': xchrcat(&out_buffer, '%', &out_len); break; 1087 xchrcat(&out_buffer, out_format[i], &out_len); break;
421 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break; 1088 case 'F':
1089 found_file = 1;
1090 if (be_wewy_wewy_quiet) break;
1091 xstrcat(&out_buffer, elf->filename, &out_len);
1092 break;
1093 case 'p':
1094 found_file = 1;
1095 if (be_wewy_wewy_quiet) break;
1096 tmp = elf->filename;
1097 if (search_path) {
1098 ssize_t len_search = strlen(search_path);
1099 ssize_t len_file = strlen(elf->filename);
1100 if (!strncmp(elf->filename, search_path, len_search) && \
1101 len_file > len_search)
1102 tmp += len_search;
1103 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1104 }
1105 xstrcat(&out_buffer, tmp, &out_len);
1106 break;
1107 case 'f':
1108 found_file = 1;
1109 if (be_wewy_wewy_quiet) break;
1110 tmp = strrchr(elf->filename, '/');
1111 tmp = (tmp == NULL ? elf->filename : tmp+1);
1112 xstrcat(&out_buffer, tmp, &out_len);
1113 break;
422 case 'o': out = get_elfetype(elf); break; 1114 case 'o': out = get_elfetype(elf); break;
423 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1115 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
424 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break; 1116 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; 1117 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1118 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; 1119 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1120 case 'n':
427 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break; 1121 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; 1122 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1123 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1124 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
429 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break; 1125 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1126 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1127 case 'a': out = get_elfemtype(elf); break;
1128 default: warnf("'%c' has no scan code?", out_format[i]);
430 } 1129 }
1130 if (out) {
1131 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1132 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1133 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1134 else
431 if (out) xstrcat(&out_buffer, out, &out_len); 1135 xstrcat(&out_buffer, out, &out_len);
432 } 1136 }
1137 }
433 1138
434 if (!found_file) { 1139#define FOUND_SOMETHING() \
435 if (!be_quiet || found_pax || found_stack || found_textrel || \ 1140 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
436 found_rpath || found_needed || found_interp || found_sym) 1141 found_rpath || found_needed || found_interp || found_bind || \
1142 found_soname || found_sym || found_lib || found_textrels || found_section )
1143
1144 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1145 xchrcat(&out_buffer, ' ', &out_len);
437 xstrcat(&out_buffer, filename, &out_len); 1146 xstrcat(&out_buffer, elf->filename, &out_len);
438 } 1147 }
439 if (!(be_quiet && xemptybuffer(out_buffer))) 1148 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
440 puts(out_buffer); 1149 puts(out_buffer);
1150 fflush(stdout);
1151 }
441 1152
1153 return 0;
1154}
1155
1156/* scan a single elf */
1157static int scanelf_elf(const char *filename, int fd, size_t len)
1158{
1159 int ret = 1;
1160 elfobj *elf;
1161
1162 /* verify this is real ELF */
1163 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1164 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1165 return ret;
1166 }
1167 switch (match_bits) {
1168 case 32:
1169 if (elf->elf_class != ELFCLASS32)
1170 goto label_done;
1171 break;
1172 case 64:
1173 if (elf->elf_class != ELFCLASS64)
1174 goto label_done;
1175 break;
1176 default: break;
1177 }
1178 if (strlen(match_etypes)) {
1179 char sbuf[126];
1180 strncpy(sbuf, match_etypes, sizeof(sbuf));
1181 if (strchr(match_etypes, ',') != NULL) {
1182 char *p;
1183 while((p = strrchr(sbuf, ',')) != NULL) {
1184 *p = 0;
1185 if (etype_lookup(p+1) == get_etype(elf))
1186 goto label_ret;
1187 }
1188 }
1189 if (etype_lookup(sbuf) != get_etype(elf))
1190 goto label_done;
1191 }
1192
1193label_ret:
1194 ret = scanelf_elfobj(elf);
1195
1196label_done:
442 unreadelf(elf); 1197 unreadelf(elf);
1198 return ret;
1199}
1200
1201/* scan an archive of elfs */
1202static int scanelf_archive(const char *filename, int fd, size_t len)
1203{
1204 archive_handle *ar;
1205 archive_member *m;
1206 char *ar_buffer;
1207 elfobj *elf;
1208
1209 ar = ar_open_fd(filename, fd);
1210 if (ar == NULL)
1211 return 1;
1212
1213 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1214 while ((m=ar_next(ar)) != NULL) {
1215 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1216 if (elf) {
1217 scanelf_elfobj(elf);
1218 unreadelf(elf);
1219 }
1220 }
1221 munmap(ar_buffer, len);
1222
1223 return 0;
1224}
1225/* scan a file which may be an elf or an archive or some other magical beast */
1226static int scanelf_file(const char *filename, const struct stat *st_cache)
1227{
1228 const struct stat *st = st_cache;
1229 struct stat symlink_st;
1230 int fd;
1231
1232 /* always handle regular files and handle symlinked files if no -y */
1233 if (S_ISLNK(st->st_mode)) {
1234 if (!scan_symlink) return 1;
1235 stat(filename, &symlink_st);
1236 st = &symlink_st;
1237 }
1238
1239 if (!S_ISREG(st->st_mode)) {
1240 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1241 return 1;
1242 }
1243
1244 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1245 return 1;
1246
1247 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1248 /* if it isn't an ELF, maybe it's an .a archive */
1249 scanelf_archive(filename, fd, st->st_size);
1250
1251 close(fd);
1252 return 0;
443} 1253}
444 1254
445/* scan a directory for ET_EXEC files and print when we find one */ 1255/* scan a directory for ET_EXEC files and print when we find one */
446static void scanelf_dir(const char *path) 1256static int scanelf_dir(const char *path)
447{ 1257{
448 register DIR *dir; 1258 register DIR *dir;
449 register struct dirent *dentry; 1259 register struct dirent *dentry;
450 struct stat st_top, st; 1260 struct stat st_top, st;
451 char buf[_POSIX_PATH_MAX]; 1261 char buf[__PAX_UTILS_PATH_MAX];
452 size_t pathlen = 0, len = 0; 1262 size_t pathlen = 0, len = 0;
1263 int ret = 0;
453 1264
454 /* make sure path exists */ 1265 /* make sure path exists */
455 if (lstat(path, &st_top) == -1) { 1266 if (lstat(path, &st_top) == -1) {
456 if (be_verbose > 2) printf("%s: does not exist\n", path); 1267 if (be_verbose > 2) printf("%s: does not exist\n", path);
457 return; 1268 return 1;
458 } 1269 }
459 1270
460 /* ok, if it isn't a directory, assume we can open it */ 1271 /* ok, if it isn't a directory, assume we can open it */
461 if (!S_ISDIR(st_top.st_mode)) { 1272 if (!S_ISDIR(st_top.st_mode)) {
462 scanelf_file(path); 1273 return scanelf_file(path, &st_top);
463 return;
464 } 1274 }
465 1275
466 /* now scan the dir looking for fun stuff */ 1276 /* now scan the dir looking for fun stuff */
467 if ((dir = opendir(path)) == NULL) { 1277 if ((dir = opendir(path)) == NULL) {
468 warnf("could not opendir %s: %s", path, strerror(errno)); 1278 warnf("could not opendir %s: %s", path, strerror(errno));
469 return; 1279 return 1;
470 } 1280 }
471 if (be_verbose) printf("%s: scanning dir\n", path); 1281 if (be_verbose > 1) printf("%s: scanning dir\n", path);
472 1282
473 pathlen = strlen(path); 1283 pathlen = strlen(path);
474 while ((dentry = readdir(dir))) { 1284 while ((dentry = readdir(dir))) {
475 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1285 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
476 continue; 1286 continue;
477 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1287 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
478 if (len >= sizeof(buf)) { 1288 if (len >= sizeof(buf)) {
479 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf)); 1289 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1290 (unsigned long)len, (unsigned long)sizeof(buf));
480 continue; 1291 continue;
481 } 1292 }
482 sprintf(buf, "%s/%s", path, dentry->d_name); 1293 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
483 if (lstat(buf, &st) != -1) { 1294 if (lstat(buf, &st) != -1) {
484 if (S_ISREG(st.st_mode)) 1295 if (S_ISREG(st.st_mode))
485 scanelf_file(buf); 1296 ret = scanelf_file(buf, &st);
486 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1297 else if (dir_recurse && S_ISDIR(st.st_mode)) {
487 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1298 if (dir_crossmount || (st_top.st_dev == st.st_dev))
488 scanelf_dir(buf); 1299 ret = scanelf_dir(buf);
489 } 1300 }
490 } 1301 }
491 } 1302 }
492 closedir(dir); 1303 closedir(dir);
1304 return ret;
493} 1305}
1306
1307static int scanelf_from_file(const char *filename)
1308{
1309 FILE *fp = NULL;
1310 char *p;
1311 char path[__PAX_UTILS_PATH_MAX];
1312 int ret = 0;
1313
1314 if (strcmp(filename, "-") == 0)
1315 fp = stdin;
1316 else if ((fp = fopen(filename, "r")) == NULL)
1317 return 1;
1318
1319 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1320 if ((p = strchr(path, '\n')) != NULL)
1321 *p = 0;
1322 search_path = path;
1323 ret = scanelf_dir(path);
1324 }
1325 if (fp != stdin)
1326 fclose(fp);
1327 return ret;
1328}
1329
1330#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1331
1332static int load_ld_cache_config(int i, const char *fname)
1333{
1334 FILE *fp = NULL;
1335 char *p;
1336 char path[__PAX_UTILS_PATH_MAX];
1337
1338 if (i + 1 == ARRAY_SIZE(ldpaths))
1339 return i;
1340
1341 if ((fp = fopen(fname, "r")) == NULL)
1342 return i;
1343
1344 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1345 if ((p = strrchr(path, '\r')) != NULL)
1346 *p = 0;
1347 if ((p = strchr(path, '\n')) != NULL)
1348 *p = 0;
1349#ifdef __linux__
1350 // recursive includes of the same file will make this segfault.
1351 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1352 glob64_t gl;
1353 size_t x;
1354 char gpath[__PAX_UTILS_PATH_MAX];
1355
1356 memset(gpath, 0, sizeof(gpath));
1357
1358 if (path[8] != '/')
1359 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1360 else
1361 strncpy(gpath, &path[8], sizeof(gpath));
1362
1363 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1364 for (x = 0; x < gl.gl_pathc; ++x) {
1365 /* try to avoid direct loops */
1366 if (strcmp(gl.gl_pathv[x], fname) == 0)
1367 continue;
1368 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1369 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1370 globfree64(&gl);
1371 return i;
1372 }
1373 }
1374 globfree64 (&gl);
1375 continue;
1376 }
1377 }
1378#endif
1379 if (*path != '/')
1380 continue;
1381
1382 ldpaths[i++] = xstrdup(path);
1383
1384 if (i + 1 == ARRAY_SIZE(ldpaths))
1385 break;
1386 }
1387 ldpaths[i] = NULL;
1388
1389 fclose(fp);
1390 return i;
1391}
1392
1393#elif defined(__FreeBSD__) || (__DragonFly__)
1394
1395static int load_ld_cache_config(int i, const char *fname)
1396{
1397 FILE *fp = NULL;
1398 char *b = NULL, *p;
1399 struct elfhints_hdr hdr;
1400
1401 if (i + 1 == ARRAY_SIZE(ldpaths))
1402 return i;
1403
1404 if ((fp = fopen(fname, "r")) == NULL)
1405 return i;
1406
1407 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1408 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1409 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1410 {
1411 fclose(fp);
1412 return i;
1413 }
1414
1415 b = (char*)malloc(hdr.dirlistlen+1);
1416 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1417 fclose(fp);
1418 free(b);
1419 return i;
1420 }
1421
1422 while ((p = strsep(&b, ":"))) {
1423 if (*p == '\0') continue;
1424 ldpaths[i++] = xstrdup(p);
1425
1426 if (i + 1 == ARRAY_SIZE(ldpaths))
1427 break;
1428 }
1429 ldpaths[i] = NULL;
1430
1431 free(b);
1432 fclose(fp);
1433 return i;
1434}
1435
1436#else
1437
1438#warning Cache config support not implemented for your target
1439static int load_ld_cache_config(int i, const char *fname)
1440{
1441 memset(ldpaths, 0x00, sizeof(ldpaths));
1442}
1443
1444#endif
494 1445
495/* scan /etc/ld.so.conf for paths */ 1446/* scan /etc/ld.so.conf for paths */
496static void scanelf_ldpath() 1447static void scanelf_ldpath()
497{ 1448{
498 char scan_l, scan_ul, scan_ull; 1449 char scan_l, scan_ul, scan_ull;
499 char *path, *p; 1450 int i = 0;
500 FILE *fp;
501 1451
502 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1452 if (!ldpaths[0])
503 err("Unable to open ld.so.conf: %s", strerror(errno)); 1453 err("Unable to load any paths from ld.so.conf");
504 1454
505 scan_l = scan_ul = scan_ull = 0; 1455 scan_l = scan_ul = scan_ull = 0;
506 1456
507 path = (char*)xmalloc(_POSIX_PATH_MAX); 1457 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; 1458 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
515 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1; 1459 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
516 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1; 1460 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
517 scanelf_dir(path); 1461 scanelf_dir(ldpaths[i]);
1462 ++i;
518 } 1463 }
519 free(path);
520 fclose(fp);
521 1464
522 if (!scan_l) scanelf_dir("/lib"); 1465 if (!scan_l) scanelf_dir("/lib");
523 if (!scan_ul) scanelf_dir("/usr/lib"); 1466 if (!scan_ul) scanelf_dir("/usr/lib");
524 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1467 if (!scan_ull) scanelf_dir("/usr/local/lib");
525} 1468}
540 } 1483 }
541 1484
542 free(path); 1485 free(path);
543} 1486}
544 1487
545
546
547/* usage / invocation handling functions */ 1488/* usage / invocation handling functions */
548#define PARSE_FLAGS "plRmyxetrnis:aqvF:o:BhV" 1489#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
549#define a_argument required_argument 1490#define a_argument required_argument
550static struct option const long_opts[] = { 1491static struct option const long_opts[] = {
551 {"path", no_argument, NULL, 'p'}, 1492 {"path", no_argument, NULL, 'p'},
552 {"ldpath", no_argument, NULL, 'l'}, 1493 {"ldpath", no_argument, NULL, 'l'},
553 {"recursive", no_argument, NULL, 'R'}, 1494 {"recursive", no_argument, NULL, 'R'},
554 {"mount", no_argument, NULL, 'm'}, 1495 {"mount", no_argument, NULL, 'm'},
555 {"symlink", no_argument, NULL, 'y'}, 1496 {"symlink", no_argument, NULL, 'y'},
1497 {"archives", no_argument, NULL, 'A'},
1498 {"ldcache", no_argument, NULL, 'L'},
1499 {"fix", no_argument, NULL, 'X'},
1500 {"setpax", a_argument, NULL, 'z'},
556 {"pax", no_argument, NULL, 'x'}, 1501 {"pax", no_argument, NULL, 'x'},
557 {"header", no_argument, NULL, 'e'}, 1502 {"header", no_argument, NULL, 'e'},
558 {"textrel", no_argument, NULL, 't'}, 1503 {"textrel", no_argument, NULL, 't'},
559 {"rpath", no_argument, NULL, 'r'}, 1504 {"rpath", no_argument, NULL, 'r'},
560 {"needed", no_argument, NULL, 'n'}, 1505 {"needed", no_argument, NULL, 'n'},
561 {"interp", no_argument, NULL, 'i'}, 1506 {"interp", no_argument, NULL, 'i'},
1507 {"bind", no_argument, NULL, 'b'},
1508 {"soname", no_argument, NULL, 'S'},
562 {"symbol", a_argument, NULL, 's'}, 1509 {"symbol", a_argument, NULL, 's'},
1510 {"section", a_argument, NULL, 'k'},
1511 {"lib", a_argument, NULL, 'N'},
1512 {"gmatch", no_argument, NULL, 'g'},
1513 {"textrels", no_argument, NULL, 'T'},
1514 {"etype", a_argument, NULL, 'E'},
1515 {"bits", a_argument, NULL, 'M'},
563 {"all", no_argument, NULL, 'a'}, 1516 {"all", no_argument, NULL, 'a'},
564 {"quiet", no_argument, NULL, 'q'}, 1517 {"quiet", no_argument, NULL, 'q'},
565 {"verbose", no_argument, NULL, 'v'}, 1518 {"verbose", no_argument, NULL, 'v'},
566 {"format", a_argument, NULL, 'F'}, 1519 {"format", a_argument, NULL, 'F'},
1520 {"from", a_argument, NULL, 'f'},
567 {"file", a_argument, NULL, 'o'}, 1521 {"file", a_argument, NULL, 'o'},
568 {"nobanner", no_argument, NULL, 'B'}, 1522 {"nobanner", no_argument, NULL, 'B'},
569 {"help", no_argument, NULL, 'h'}, 1523 {"help", no_argument, NULL, 'h'},
570 {"version", no_argument, NULL, 'V'}, 1524 {"version", no_argument, NULL, 'V'},
571 {NULL, no_argument, NULL, 0x0} 1525 {NULL, no_argument, NULL, 0x0}
572}; 1526};
1527
573static char *opts_help[] = { 1528static const char *opts_help[] = {
574 "Scan all directories in PATH environment", 1529 "Scan all directories in PATH environment",
575 "Scan all directories in /etc/ld.so.conf", 1530 "Scan all directories in /etc/ld.so.conf",
576 "Scan directories recursively", 1531 "Scan directories recursively",
577 "Don't recursively cross mount points", 1532 "Don't recursively cross mount points",
578 "Don't scan symlinks\n", 1533 "Don't scan symlinks",
1534 "Scan archives (.a files)",
1535 "Utilize ld.so.cache information (use with -r/-n)",
1536 "Try and 'fix' bad things (use with -r/-e)",
1537 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
579 "Print PaX markings", 1538 "Print PaX markings",
580 "Print GNU_STACK markings", 1539 "Print GNU_STACK/PT_LOAD markings",
581 "Print TEXTREL information", 1540 "Print TEXTREL information",
582 "Print RPATH information", 1541 "Print RPATH information",
583 "Print NEEDED information", 1542 "Print NEEDED information",
584 "Print INTERP information", 1543 "Print INTERP information",
1544 "Print BIND information",
1545 "Print SONAME information",
585 "Find a specified symbol", 1546 "Find a specified symbol",
1547 "Find a specified section",
1548 "Find a specified library",
1549 "Use strncmp to match libraries. (use with -N)",
1550 "Locate cause of TEXTREL",
1551 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1552 "Print only ELF files matching numeric bits",
586 "Print all scanned info (-x -e -t -r)\n", 1553 "Print all scanned info (-x -e -t -r -b)\n",
587 "Only output 'bad' things", 1554 "Only output 'bad' things",
588 "Be verbose (can be specified more than once)", 1555 "Be verbose (can be specified more than once)",
589 "Use specified format for output", 1556 "Use specified format for output",
1557 "Read input stream from a filename",
590 "Write output stream to a filename", 1558 "Write output stream to a filename",
591 "Don't display the header", 1559 "Don't display the header",
592 "Print this help and exit", 1560 "Print this help and exit",
593 "Print version and exit", 1561 "Print version and exit",
594 NULL 1562 NULL
596 1564
597/* display usage and exit */ 1565/* display usage and exit */
598static void usage(int status) 1566static void usage(int status)
599{ 1567{
600 unsigned long i; 1568 unsigned long i;
601 printf(" Scan ELF binaries for stuff\n\n" 1569 printf("* Scan ELF binaries for stuff\n\n"
602 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1570 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
603 printf("Options: -[%s]\n", PARSE_FLAGS); 1571 printf("Options: -[%s]\n", PARSE_FLAGS);
604 for (i = 0; long_opts[i].name; ++i) 1572 for (i = 0; long_opts[i].name; ++i)
605 if (long_opts[i].has_arg == no_argument) 1573 if (long_opts[i].has_arg == no_argument)
606 printf(" -%c, --%-13s %s\n", long_opts[i].val, 1574 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
607 long_opts[i].name, opts_help[i]); 1575 long_opts[i].name, opts_help[i]);
608 else 1576 else
609 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val, 1577 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
610 long_opts[i].name, opts_help[i]); 1578 long_opts[i].name, opts_help[i]);
1579
1580 if (status != EXIT_SUCCESS)
1581 exit(status);
1582
1583 puts("\nThe format modifiers for the -F option are:");
1584 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1585 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1586 puts(" i INTERP \tb BIND \ts symbol");
1587 puts(" N library \to Type \tT TEXTRELs");
1588 puts(" S SONAME \tk section \ta arch");
1589 puts(" p filename (with search path removed)");
1590 puts(" f filename (short name/basename)");
1591 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1592
1593 puts("\nELF Etypes:");
1594 print_etypes(stdout);
1595
611 exit(status); 1596 exit(status);
612} 1597}
613 1598
614/* parse command line arguments and preform needed actions */ 1599/* parse command line arguments and preform needed actions */
1600#define do_pax_state(option, flag) \
1601 if (islower(option)) { \
1602 flags &= ~PF_##flag; \
1603 flags |= PF_NO##flag; \
1604 } else { \
1605 flags &= ~PF_NO##flag; \
1606 flags |= PF_##flag; \
1607 }
615static void parseargs(int argc, char *argv[]) 1608static int parseargs(int argc, char *argv[])
616{ 1609{
617 int flag; 1610 int i;
1611 const char *from_file = NULL;
1612 int ret = 0;
618 1613
619 opterr = 0; 1614 opterr = 0;
620 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1615 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
621 switch (flag) { 1616 switch (i) {
622 1617
623 case 'V': 1618 case 'V':
624 printf("%s compiled %s\n%s\n" 1619 printf("pax-utils-%s: %s compiled %s\n%s\n"
625 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 1620 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
626 __FILE__, __DATE__, rcsid, argv0); 1621 VERSION, __FILE__, __DATE__, rcsid, argv0);
627 exit(EXIT_SUCCESS); 1622 exit(EXIT_SUCCESS);
628 break; 1623 break;
629 case 'h': usage(EXIT_SUCCESS); break; 1624 case 'h': usage(EXIT_SUCCESS); break;
630 1625 case 'f':
1626 if (from_file) warn("You prob don't want to specify -f twice");
1627 from_file = optarg;
1628 break;
1629 case 'E':
1630 strncpy(match_etypes, optarg, sizeof(match_etypes));
1631 break;
1632 case 'M':
1633 match_bits = atoi(optarg);
1634 break;
631 case 'o': { 1635 case 'o': {
632 FILE *fp = NULL;
633 fp = freopen(optarg, "w", stdout); 1636 if (freopen(optarg, "w", stdout) == NULL)
634 if (fp == NULL)
635 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1637 err("Could not open output stream '%s': %s", optarg, strerror(errno));
636 stdout = fp;
637 break; 1638 break;
638 } 1639 }
639 1640 case 'k':
1641 if (find_section) warn("You prob don't want to specify -k twice");
1642 find_section = optarg;
1643 break;
640 case 's': { 1644 case 's': {
641 size_t len; 1645 if (find_sym) warn("You prob don't want to specify -s twice");
642 find_sym = xstrdup(optarg); 1646 find_sym = optarg;
643 len = strlen(find_sym) + 1;
644 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1)); 1647 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
645 sprintf(versioned_symname, "%s@", find_sym); 1648 sprintf(versioned_symname, "%s@", find_sym);
646 break; 1649 break;
647 } 1650 }
1651 case 'N': {
1652 if (find_lib) warn("You prob don't want to specify -N twice");
1653 find_lib = optarg;
1654 break;
1655 }
648 1656
649 case 'F': { 1657 case 'F': {
1658 if (out_format) warn("You prob don't want to specify -F twice");
650 out_format = strdup(optarg); 1659 out_format = optarg;
1660 break;
1661 }
1662 case 'z': {
1663 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1664 size_t x;
1665
1666 for (x = 0 ; x < strlen(optarg); x++) {
1667 switch(optarg[x]) {
1668 case 'p':
1669 case 'P':
1670 do_pax_state(optarg[x], PAGEEXEC);
651 break; 1671 break;
1672 case 's':
1673 case 'S':
1674 do_pax_state(optarg[x], SEGMEXEC);
1675 break;
1676 case 'm':
1677 case 'M':
1678 do_pax_state(optarg[x], MPROTECT);
1679 break;
1680 case 'e':
1681 case 'E':
1682 do_pax_state(optarg[x], EMUTRAMP);
1683 break;
1684 case 'r':
1685 case 'R':
1686 do_pax_state(optarg[x], RANDMMAP);
1687 break;
1688 case 'x':
1689 case 'X':
1690 do_pax_state(optarg[x], RANDEXEC);
1691 break;
1692 default:
1693 break;
1694 }
652 } 1695 }
653 1696 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1697 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1698 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1699 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1700 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1701 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1702 setpax = flags;
1703 break;
1704 }
1705 case 'g': gmatch = 1; break;
1706 case 'L': use_ldcache = 1; break;
654 case 'y': scan_symlink = 0; break; 1707 case 'y': scan_symlink = 0; break;
1708 case 'A': scan_archives = 1; break;
655 case 'B': show_banner = 0; break; 1709 case 'B': show_banner = 0; break;
656 case 'l': scan_ldpath = 1; break; 1710 case 'l': scan_ldpath = 1; break;
657 case 'p': scan_envpath = 1; break; 1711 case 'p': scan_envpath = 1; break;
658 case 'R': dir_recurse = 1; break; 1712 case 'R': dir_recurse = 1; break;
659 case 'm': dir_crossmount = 0; break; 1713 case 'm': dir_crossmount = 0; break;
1714 case 'X': ++fix_elf; break;
660 case 'x': show_pax = 1; break; 1715 case 'x': show_pax = 1; break;
661 case 'e': show_stack = 1; break; 1716 case 'e': show_phdr = 1; break;
662 case 't': show_textrel = 1; break; 1717 case 't': show_textrel = 1; break;
663 case 'r': show_rpath = 1; break; 1718 case 'r': show_rpath = 1; break;
664 case 'n': show_needed = 1; break; 1719 case 'n': show_needed = 1; break;
665 case 'i': show_interp = 1; break; 1720 case 'i': show_interp = 1; break;
1721 case 'b': show_bind = 1; break;
1722 case 'S': show_soname = 1; break;
1723 case 'T': show_textrels = 1; break;
666 case 'q': be_quiet = 1; break; 1724 case 'q': be_quiet = 1; break;
667 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1725 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; 1726 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
669 1727
670 case ':': 1728 case ':':
671 warn("Option missing parameter\n"); 1729 err("Option '%c' is missing parameter", optopt);
672 usage(EXIT_FAILURE);
673 break;
674 case '?': 1730 case '?':
675 warn("Unknown option\n"); 1731 err("Unknown option '%c' or argument missing", optopt);
676 usage(EXIT_FAILURE);
677 break;
678 default: 1732 default:
679 err("Unhandled option '%c'", flag); 1733 err("Unhandled option '%c'; please report this", i);
680 break;
681 }
682 } 1734 }
683 1735 }
684 if (be_quiet && be_verbose)
685 err("You can be quiet or you can be verbose, not both, stupid");
686 1736
687 /* let the format option override all other options */ 1737 /* let the format option override all other options */
688 if (out_format) { 1738 if (out_format) {
689 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0; 1739 show_pax = show_phdr = show_textrel = show_rpath = \
1740 show_needed = show_interp = show_bind = show_soname = \
1741 show_textrels = 0;
690 for (flag=0; out_format[flag]; ++flag) { 1742 for (i = 0; out_format[i]; ++i) {
691 if (out_format[flag] != '%') continue; 1743 if (!IS_MODIFIER(out_format[i])) continue;
692 1744
693 switch (out_format[++flag]) { 1745 switch (out_format[++i]) {
1746 case '+': break;
694 case '%': break; 1747 case '%': break;
1748 case '#': break;
695 case 'F': break; 1749 case 'F': break;
1750 case 'p': break;
1751 case 'f': break;
1752 case 'k': break;
696 case 's': break; 1753 case 's': break;
1754 case 'N': break;
697 case 'o': break; 1755 case 'o': break;
1756 case 'a': break;
698 case 'x': show_pax = 1; break; 1757 case 'x': show_pax = 1; break;
699 case 'e': show_stack = 1; break; 1758 case 'e': show_phdr = 1; break;
700 case 't': show_textrel = 1; break; 1759 case 't': show_textrel = 1; break;
701 case 'r': show_rpath = 1; break; 1760 case 'r': show_rpath = 1; break;
702 case 'n': show_needed = 1; break; 1761 case 'n': show_needed = 1; break;
703 case 'i': show_interp = 1; break; 1762 case 'i': show_interp = 1; break;
1763 case 'b': show_bind = 1; break;
1764 case 'S': show_soname = 1; break;
1765 case 'T': show_textrels = 1; break;
704 default: 1766 default:
705 err("Invalid format specifier '%c' (byte %i)", 1767 err("Invalid format specifier '%c' (byte %i)",
706 out_format[flag], flag+1); 1768 out_format[i], i+1);
707 } 1769 }
708 } 1770 }
709 1771
710 /* construct our default format */ 1772 /* construct our default format */
711 } else { 1773 } else {
712 size_t fmt_len = 30; 1774 size_t fmt_len = 30;
713 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 1775 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
714 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 1776 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
715 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 1777 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
716 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len); 1778 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
717 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 1779 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
718 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 1780 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
719 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 1781 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
720 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 1782 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1783 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1784 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1785 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
721 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 1786 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1787 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1788 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
722 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1789 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
723 } 1790 }
724 if (be_verbose > 2) printf("Format: %s\n", out_format); 1791 if (be_verbose > 2) printf("Format: %s\n", out_format);
725 1792
726 /* now lets actually do the scanning */ 1793 /* now lets actually do the scanning */
1794 if (scan_ldpath || use_ldcache)
1795 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
727 if (scan_ldpath) scanelf_ldpath(); 1796 if (scan_ldpath) scanelf_ldpath();
728 if (scan_envpath) scanelf_envpath(); 1797 if (scan_envpath) scanelf_envpath();
1798 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1799 from_file = "-";
1800 if (from_file) {
1801 scanelf_from_file(from_file);
1802 from_file = *argv;
1803 }
729 if (optind == argc && !scan_ldpath && !scan_envpath) 1804 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
730 err("Nothing to scan !?"); 1805 err("Nothing to scan !?");
731 while (optind < argc) 1806 while (optind < argc) {
732 scanelf_dir(argv[optind++]); 1807 search_path = argv[optind++];
1808 ret = scanelf_dir(search_path);
1809 }
733 1810
734 /* clean up */ 1811 /* clean up */
735 if (find_sym) {
736 free(find_sym);
737 free(versioned_symname); 1812 free(versioned_symname);
1813 for (i = 0; ldpaths[i]; ++i)
1814 free(ldpaths[i]);
1815
1816 if (ldcache != 0)
1817 munmap(ldcache, ldcache_size);
1818 return ret;
1819}
1820
1821static char **get_split_env(const char *envvar)
1822{
1823 const char *delims = " \t\n";
1824 char **envvals = NULL;
1825 char *env, *s;
1826 int nentry;
1827
1828 if ((env = getenv(envvar)) == NULL)
1829 return NULL;
1830
1831 env = xstrdup(env);
1832 if (env == NULL)
1833 return NULL;
1834
1835 s = strtok(env, delims);
1836 if (s == NULL) {
1837 free(env);
1838 return NULL;
738 } 1839 }
739 if (out_format) free(out_format); 1840
1841 nentry = 0;
1842 while (s != NULL) {
1843 ++nentry;
1844 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1845 envvals[nentry-1] = s;
1846 s = strtok(NULL, delims);
1847 }
1848 envvals[nentry] = NULL;
1849
1850 /* don't want to free(env) as it contains the memory that backs
1851 * the envvals array of strings */
1852 return envvals;
1853}
1854static void parseenv()
1855{
1856 qa_textrels = get_split_env("QA_TEXTRELS");
1857 qa_execstack = get_split_env("QA_EXECSTACK");
1858 qa_wx_load = get_split_env("QA_WX_LOAD");
1859}
1860
1861#ifdef __PAX_UTILS_CLEANUP
1862static void cleanup()
1863{
1864 free(out_format);
1865 free(qa_textrels);
1866 free(qa_execstack);
1867 free(qa_wx_load);
1868}
1869#endif
1870
1871
1872int main(int argc, char *argv[])
1873{
1874 int ret;
1875 if (argc < 2)
1876 usage(EXIT_FAILURE);
1877 parseenv();
1878 ret = parseargs(argc, argv);
1879 fclose(stdout);
1880#ifdef __PAX_UTILS_CLEANUP
1881 cleanup();
1882 warn("The calls to add/delete heap should be off:\n"
1883 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1884 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1885#endif
1886 return ret;
740} 1887}
741 1888
742 1889
743 1890
744/* utility funcs */ 1891/* utility funcs */
745static char *xstrdup(char *s) 1892static char *xstrdup(const char *s)
746{ 1893{
747 char *ret = strdup(s); 1894 char *ret = strdup(s);
748 if (!ret) err("Could not strdup(): %s", strerror(errno)); 1895 if (!ret) err("Could not strdup(): %s", strerror(errno));
749 return ret; 1896 return ret;
750} 1897}
752{ 1899{
753 void *ret = malloc(size); 1900 void *ret = malloc(size);
754 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 1901 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
755 return ret; 1902 return ret;
756} 1903}
1904static void *xrealloc(void *ptr, size_t size)
1905{
1906 void *ret = realloc(ptr, size);
1907 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
1908 return ret;
1909}
757static void xstrcat(char **dst, const char *src, size_t *curr_len) 1910static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
758{ 1911{
759 long new_len; 1912 size_t new_len;
760 1913
761 new_len = strlen(*dst) + strlen(src); 1914 new_len = strlen(*dst) + strlen(src);
762 if (*curr_len <= new_len) { 1915 if (*curr_len <= new_len) {
763 *curr_len = new_len + (*curr_len / 2); 1916 *curr_len = new_len + (*curr_len / 2);
764 *dst = realloc(*dst, *curr_len); 1917 *dst = realloc(*dst, *curr_len);
765 if (!*dst) 1918 if (!*dst)
766 err("could not realloc %li bytes", (unsigned long)*curr_len); 1919 err("could not realloc() %li bytes", (unsigned long)*curr_len);
767 } 1920 }
768 1921
1922 if (n)
1923 strncat(*dst, src, n);
1924 else
769 strcat(*dst, src); 1925 strcat(*dst, src);
770} 1926}
771static inline void xchrcat(char **dst, const char append, size_t *curr_len) 1927static inline void xchrcat(char **dst, const char append, size_t *curr_len)
772{ 1928{
773 static char my_app[2]; 1929 static char my_app[2];
774 my_app[0] = append; 1930 my_app[0] = append;
775 my_app[1] = '\0'; 1931 my_app[1] = '\0';
776 xstrcat(dst, my_app, curr_len); 1932 xstrcat(dst, my_app, curr_len);
777} 1933}
778static int xemptybuffer(const char *buff) 1934
1935/* Match filename against entries in matchlist, return TRUE
1936 * if the file is listed */
1937static int file_matches_list(const char *filename, char **matchlist)
779{ 1938{
780 long i; 1939 char **file;
781 for (i=0; buff[i]; ++i) 1940 char *match;
782 if (buff[i] != ' ') 1941 char buf[__PAX_UTILS_PATH_MAX];
1942
1943 if (matchlist == NULL)
783 return 0; 1944 return 0;
1945
1946 for (file = matchlist; *file != NULL; file++) {
1947 if (search_path) {
1948 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
1949 match = buf;
1950 } else {
1951 match = *file;
1952 }
1953 if (fnmatch(match, filename, 0) == 0)
784 return 1; 1954 return 1;
1955 }
1956 return 0;
785} 1957}
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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