/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.52 Revision 1.91
1/* 1/*
2 * Copyright 2003 Ned Ludd <solar@gentoo.org>
3 * Copyright 1999-2005 Gentoo Foundation 2 * Copyright 2003-2005 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 1.52 2005/05/18 14:37:21 solar Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.91 2005/12/07 01:04:52 vapier Exp $
6 * 5 *
7 ******************************************************************** 6 * Copyright 2003-2005 Ned Ludd - <solar@gentoo.org>
8 * This program is free software; you can redistribute it and/or 7 * Copyright 2004-2005 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> 10#include <stdio.h>
25#include <stdlib.h> 11#include <stdlib.h>
26#include <sys/types.h> 12#include <sys/types.h>
13#include <libgen.h>
14#include <limits.h>
27#define __USE_GNU 15#define __USE_GNU
28#include <string.h> 16#include <string.h>
29#include <errno.h> 17#include <errno.h>
30#include <unistd.h> 18#include <unistd.h>
31#include <sys/stat.h> 19#include <sys/stat.h>
32#include <dirent.h> 20#include <dirent.h>
33#include <getopt.h> 21#include <getopt.h>
34#include <assert.h> 22#include <assert.h>
35
36#include "paxelf.h" 23#include "paxinc.h"
37 24
38static const char *rcsid = "$Id: scanelf.c,v 1.52 2005/05/18 14:37:21 solar Exp $"; 25static const char *rcsid = "$Id: scanelf.c,v 1.91 2005/12/07 01:04:52 vapier Exp $";
39#define argv0 "scanelf" 26#define argv0 "scanelf"
27
28#define IS_MODIFIER(c) (c == '%' || c == '#')
40 29
41 30
42 31
43/* prototypes */ 32/* prototypes */
44static void scanelf_file(const char *filename); 33static void scanelf_file(const char *filename);
45static void scanelf_dir(const char *path); 34static void scanelf_dir(const char *path);
46static void scanelf_ldpath(); 35static void scanelf_ldpath();
47static void scanelf_envpath(); 36static void scanelf_envpath();
48static void usage(int status); 37static void usage(int status);
49static void parseargs(int argc, char *argv[]); 38static void parseargs(int argc, char *argv[]);
50static char *xstrdup(char *s); 39static char *xstrdup(const char *s);
51static void *xmalloc(size_t size); 40static void *xmalloc(size_t size);
52static void xstrcat(char **dst, const char *src, size_t *curr_len); 41static void xstrcat(char **dst, const char *src, size_t *curr_len);
53static inline void xchrcat(char **dst, const char append, size_t *curr_len); 42static inline void xchrcat(char **dst, const char append, size_t *curr_len);
54static int xemptybuffer(const char *buff);
55 43
56/* variables to control behavior */ 44/* variables to control behavior */
57static char *ldpaths[256]; 45static char *ldpaths[256];
58static char scan_ldpath = 0; 46static char scan_ldpath = 0;
59static char scan_envpath = 0; 47static char scan_envpath = 0;
60static char scan_symlink = 1; 48static char scan_symlink = 1;
61static char dir_recurse = 0; 49static char dir_recurse = 0;
62static char dir_crossmount = 1; 50static char dir_crossmount = 1;
63static char show_pax = 0; 51static char show_pax = 0;
64static char show_stack = 0; 52static char show_phdr = 0;
65static char show_textrel = 0; 53static char show_textrel = 0;
66static char show_rpath = 0; 54static char show_rpath = 0;
67static char show_needed = 0; 55static char show_needed = 0;
68static char show_interp = 0; 56static char show_interp = 0;
69static char show_bind = 0; 57static char show_bind = 0;
58static char show_soname = 0;
59static char show_textrels = 0;
70static char show_banner = 1; 60static char show_banner = 1;
71static char be_quiet = 0; 61static char be_quiet = 0;
72static char be_verbose = 0; 62static char be_verbose = 0;
63static char be_wewy_wewy_quiet = 0;
73static char *find_sym = NULL, *versioned_symname = NULL; 64static char *find_sym = NULL, *versioned_symname = NULL;
65static char *find_lib = NULL;
74static char *out_format = NULL; 66static char *out_format = NULL;
75 67static char *search_path = NULL;
68static char gmatch = 0;
76 69
77 70
78/* sub-funcs for scanelf_file() */ 71/* sub-funcs for scanelf_file() */
72static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
73{
74 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
75#define GET_SYMTABS(B) \
76 if (elf->elf_class == ELFCLASS ## B) { \
77 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
78 /* debug sections */ \
79 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
80 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
81 /* runtime sections */ \
82 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
83 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
84 if (symtab && dynsym) { \
85 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
86 } else { \
87 *sym = (void*)(symtab ? symtab : dynsym); \
88 } \
89 if (strtab && dynstr) { \
90 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
91 } else { \
92 *tab = (void*)(strtab ? strtab : dynstr); \
93 } \
94 }
95 GET_SYMTABS(32)
96 GET_SYMTABS(64)
97}
79static char *scanelf_file_pax(elfobj *elf, char *found_pax) 98static char *scanelf_file_pax(elfobj *elf, char *found_pax)
80{ 99{
81 static char *paxflags; 100 static char ret[7];
101 unsigned long i, shown;
82 102
83 if (!show_pax) return NULL; 103 if (!show_pax) return NULL;
84 104
85 paxflags = pax_short_hf_flags(PAX_FLAGS(elf));
86 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) {
87 *found_pax = 1;
88 return paxflags;
89 }
90
91 return NULL;
92}
93static char *scanelf_file_stack(elfobj *elf, char *found_stack, char *found_relro)
94{
95 static char ret[8];
96 char *found;
97 unsigned long i, off, shown;
98
99 if (!show_stack) return NULL;
100
101 shown = 0; 105 shown = 0;
102 strcpy(ret, "--- ---"); 106 memset(&ret, 0, sizeof(ret));
103 107
104 if (elf->phdr) { 108 if (elf->phdr) {
105#define SHOW_STACK(B) \ 109#define SHOW_PAX(B) \
106 if (elf->elf_class == ELFCLASS ## B) { \ 110 if (elf->elf_class == ELFCLASS ## B) { \
107 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 111 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
108 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 112 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
109 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 113 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
110 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 114 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
111 found = found_stack; \
112 off = 0; \
113 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
114 found = found_relro; \
115 off = 3; \
116 } else \
117 continue; \ 115 continue; \
118 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ 116 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \
119 continue; \ 117 continue; \
120 memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \ 118 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
121 *found = 1; \ 119 *found_pax = 1; \
122 ++shown; \ 120 ++shown; \
121 break; \
123 } \ 122 } \
124 } 123 }
125 SHOW_STACK(32) 124 SHOW_PAX(32)
126 SHOW_STACK(64) 125 SHOW_PAX(64)
126 }
127
128 /* fall back to EI_PAX if no PT_PAX was found */
129 if (!*ret) {
130 static char *paxflags;
131 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
132 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
133 *found_pax = 1;
134 return (be_wewy_wewy_quiet ? NULL : paxflags);
127 } 135 }
136 strncpy(ret, paxflags, sizeof(ret));
137 }
128 138
129 if (be_quiet && !shown) 139 if (be_wewy_wewy_quiet || (be_quiet && !shown))
130 return NULL; 140 return NULL;
131 else 141 else
132 return ret; 142 return ret;
133} 143}
144
145static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
146{
147 static char ret[12];
148 char *found;
149 unsigned long i, shown;
150 unsigned char multi_stack, multi_relro, multi_load;
151
152 if (!show_phdr) return NULL;
153
154 memcpy(ret, "--- --- ---\0", 12);
155
156 shown = 0;
157 multi_stack = multi_relro = multi_load = 0;
158
159#define SHOW_PHDR(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \
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) { \
165 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
166 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
167 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
168 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
169 found = found_phdr; \
170 offset = 0; \
171 check_flags = PF_X; \
172 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
173 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
174 found = found_relro; \
175 offset = 4; \
176 check_flags = PF_X; \
177 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
178 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \
179 found = found_load; \
180 offset = 8; \
181 check_flags = PF_W|PF_X; \
182 } else \
183 continue; \
184 flags = EGET(phdr[i].p_flags); \
185 if (be_quiet && ((flags & check_flags) != check_flags)) \
186 continue; \
187 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
188 *found = 1; \
189 ++shown; \
190 } \
191 } else if (elf->shdr != NULL) { \
192 /* no program headers which means this is prob an object file */ \
193 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
194 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
195 check_flags = SHF_WRITE|SHF_EXECINSTR; \
196 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
197 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
198 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
199 if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \
200 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
201 flags = EGET(shdr[i].sh_flags); \
202 if (be_quiet && ((flags & check_flags) != check_flags)) \
203 continue; \
204 ++*found_phdr; \
205 shown = 1; \
206 if (flags & SHF_WRITE) ret[0] = 'W'; \
207 if (flags & SHF_ALLOC) ret[1] = 'A'; \
208 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
209 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
210 break; \
211 } \
212 } \
213 if (!multi_stack) { \
214 *found_phdr = 1; \
215 shown = 1; \
216 memcpy(ret, "!WX", 3); \
217 } \
218 } \
219 }
220 SHOW_PHDR(32)
221 SHOW_PHDR(64)
222
223 if (be_wewy_wewy_quiet || (be_quiet && !shown))
224 return NULL;
225 else
226 return ret;
227}
134static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 228static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
135{ 229{
136 static char *ret = "TEXTREL"; 230 static const char *ret = "TEXTREL";
137 unsigned long i; 231 unsigned long i;
138 232
139 if (!show_textrel) return NULL; 233 if (!show_textrel && !show_textrels) return NULL;
140 234
141 if (elf->phdr) { 235 if (elf->phdr) {
142#define SHOW_TEXTREL(B) \ 236#define SHOW_TEXTREL(B) \
143 if (elf->elf_class == ELFCLASS ## B) { \ 237 if (elf->elf_class == ELFCLASS ## B) { \
144 Elf ## B ## _Dyn *dyn; \ 238 Elf ## B ## _Dyn *dyn; \
145 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 239 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
146 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 240 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
147 Elf ## B ## _Off offset; \ 241 Elf ## B ## _Off offset; \
148 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 242 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
149 if (phdr[i].p_type != PT_DYNAMIC) continue; \ 243 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
150 offset = EGET(phdr[i].p_offset); \ 244 offset = EGET(phdr[i].p_offset); \
151 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 245 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
152 dyn = DYN ## B (elf->data + offset); \ 246 dyn = DYN ## B (elf->data + offset); \
153 while (EGET(dyn->d_tag) != DT_NULL) { \ 247 while (EGET(dyn->d_tag) != DT_NULL) { \
154 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 248 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
155 *found_textrel = 1; \ 249 *found_textrel = 1; \
156 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 250 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
157 return ret; \ 251 return (be_wewy_wewy_quiet ? NULL : ret); \
158 } \ 252 } \
159 ++dyn; \ 253 ++dyn; \
160 } \ 254 } \
161 } } 255 } }
162 SHOW_TEXTREL(32) 256 SHOW_TEXTREL(32)
163 SHOW_TEXTREL(64) 257 SHOW_TEXTREL(64)
164 } 258 }
165 259
166 if (be_quiet) 260 if (be_quiet || be_wewy_wewy_quiet)
167 return NULL; 261 return NULL;
168 else 262 else
169 return " - "; 263 return " - ";
170} 264}
265static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
266{
267 unsigned long s, r, rmax;
268 void *symtab_void, *strtab_void, *text_void;
269
270 if (!show_textrels) return NULL;
271
272 /* don't search for TEXTREL's if the ELF doesn't have any */
273 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
274 if (!*found_textrel) return NULL;
275
276 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
277 text_void = elf_findsecbyname(elf, ".text");
278
279 if (symtab_void && strtab_void && text_void && elf->shdr) {
280#define SHOW_TEXTRELS(B) \
281 if (elf->elf_class == ELFCLASS ## B) { \
282 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
283 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
284 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
285 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
286 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
287 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
288 uint ## B ## _t memsz = EGET(text->sh_size); \
289 Elf ## B ## _Rel *rel; \
290 Elf ## B ## _Rela *rela; \
291 /* search the section headers for relocations */ \
292 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
293 uint32_t sh_type = EGET(shdr[s].sh_type); \
294 if (sh_type == SHT_REL) { \
295 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
296 rela = NULL; \
297 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
298 } else if (sh_type == SHT_RELA) { \
299 rel = NULL; \
300 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
301 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
302 } else \
303 continue; \
304 /* now see if any of the relocs are in the .text */ \
305 for (r = 0; r < rmax; ++r) { \
306 unsigned long sym_max; \
307 Elf ## B ## _Addr offset_tmp; \
308 Elf ## B ## _Sym *func; \
309 Elf ## B ## _Sym *sym; \
310 Elf ## B ## _Addr r_offset; \
311 uint ## B ## _t r_info; \
312 if (sh_type == SHT_REL) { \
313 r_offset = EGET(rel[r].r_offset); \
314 r_info = EGET(rel[r].r_info); \
315 } else { \
316 r_offset = EGET(rela[r].r_offset); \
317 r_info = EGET(rela[r].r_info); \
318 } \
319 /* make sure this relocation is inside of the .text */ \
320 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
321 if (be_verbose <= 2) continue; \
322 } else \
323 *found_textrels = 1; \
324 /* locate this relocation symbol name */ \
325 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
326 sym_max = ELF ## B ## _R_SYM(r_info); \
327 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
328 sym += sym_max; \
329 else \
330 sym = NULL; \
331 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
332 /* show the raw details about this reloc */ \
333 printf(" %s: ", elf->base_filename); \
334 if (sym && sym->st_name) \
335 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
336 else \
337 printf("(memory/fake?)"); \
338 printf(" [0x%lX]", (unsigned long)r_offset); \
339 /* now try to find the closest symbol that this rel is probably in */ \
340 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
341 func = NULL; \
342 offset_tmp = 0; \
343 while (sym_max--) { \
344 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
345 func = sym; \
346 offset_tmp = EGET(sym->st_value); \
347 } \
348 ++sym; \
349 } \
350 printf(" in "); \
351 if (func && func->st_name) \
352 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
353 else \
354 printf("(NULL: fake?)"); \
355 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
356 } \
357 } }
358 SHOW_TEXTRELS(32)
359 SHOW_TEXTRELS(64)
360 }
361 if (!*found_textrels)
362 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
363
364 return NULL;
365}
366
367static void rpath_security_checks(elfobj *, char *);
368static void rpath_security_checks(elfobj *elf, char *item) {
369 struct stat st;
370 switch (*item) {
371 case '/': break;
372 case '.':
373 warnf("Security problem with relative RPATH '%s' in %s", item, elf->filename);
374 break;
375 case '\0':
376 warnf("Security problem NULL RPATH in %s", elf->filename);
377 break;
378 case '$':
379 if (fstat(elf->fd, &st) != -1)
380 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
381 warnf("Security problem with RPATH='%s' in %s with mode set of %o",
382 item, elf->filename, st.st_mode & 07777);
383 break;
384 default:
385 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename);
386 break;
387 }
388}
171static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 389static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
172{ 390{
173 /* TODO: when checking RPATH entries, check each subpath (between :) in ld.so.conf */
174 unsigned long i, s; 391 unsigned long i, s;
175 char *rpath, *runpath, **r; 392 char *rpath, *runpath, **r;
176 void *strtbl_void; 393 void *strtbl_void;
177 394
178 if (!show_rpath) return; 395 if (!show_rpath) return;
186 Elf ## B ## _Dyn *dyn; \ 403 Elf ## B ## _Dyn *dyn; \
187 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 404 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
188 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 405 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
189 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 406 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
190 Elf ## B ## _Off offset; \ 407 Elf ## B ## _Off offset; \
191 Elf ## B ## _Sxword word; \ 408 Elf ## B ## _Xword word; \
192 /* Scan all the program headers */ \ 409 /* Scan all the program headers */ \
193 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 410 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
194 /* Just scan dynamic headers */ \ 411 /* Just scan dynamic headers */ \
195 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 412 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
196 offset = EGET(phdr[i].p_offset); \ 413 offset = EGET(phdr[i].p_offset); \
206 ++dyn; \ 423 ++dyn; \
207 continue; \ 424 continue; \
208 } \ 425 } \
209 /* Verify the memory is somewhat sane */ \ 426 /* Verify the memory is somewhat sane */ \
210 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 427 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
211 if (offset < elf->len) { \ 428 if (offset < (Elf ## B ## _Off)elf->len) { \
212 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 429 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
213 *r = (char*)(elf->data + offset); \ 430 *r = (char*)(elf->data + offset); \
214 /* If quiet, don't output paths in ld.so.conf */ \ 431 /* If quiet, don't output paths in ld.so.conf */ \
215 if (be_quiet) \ 432 if (be_quiet) { \
433 size_t len; \
434 char *start, *end; \
435 /* note that we only 'chop' off leading known paths. */ \
436 /* since *r is read-only memory, we can only move the ptr forward. */ \
437 start = *r; \
438 /* scan each path in : delimited list */ \
439 while (start) { \
440 rpath_security_checks(elf, start); \
441 end = strchr(start, ':'); \
442 len = (end ? abs(end - start) : strlen(start)); \
216 for (s = 0; ldpaths[s]; ++s) \ 443 for (s = 0; ldpaths[s]; ++s) { \
217 if (!strcmp(ldpaths[s], *r)) { \ 444 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
218 *r = NULL; \ 445 *r = (end ? end + 1 : NULL); \
219 break; \ 446 break; \
447 } \
220 } \ 448 } \
449 if (!*r || !ldpaths[s] || !end) \
450 start = NULL; \
451 else \
452 start = start + len + 1; \
453 } \
454 } \
221 if (*r) *found_rpath = 1; \ 455 if (*r) *found_rpath = 1; \
222 } \ 456 } \
223 ++dyn; \ 457 ++dyn; \
224 } \ 458 } \
225 } } 459 } }
226 SHOW_RPATH(32) 460 SHOW_RPATH(32)
227 SHOW_RPATH(64) 461 SHOW_RPATH(64)
228 } 462 }
463
464 if (be_wewy_wewy_quiet) return;
229 465
230 if (rpath && runpath) { 466 if (rpath && runpath) {
231 if (!strcmp(rpath, runpath)) { 467 if (!strcmp(rpath, runpath)) {
232 xstrcat(ret, runpath, ret_len); 468 xstrcat(ret, runpath, ret_len);
233 } else { 469 } else {
241 } else if (rpath || runpath) 477 } else if (rpath || runpath)
242 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 478 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
243 else if (!be_quiet) 479 else if (!be_quiet)
244 xstrcat(ret, " - ", ret_len); 480 xstrcat(ret, " - ", ret_len);
245} 481}
246static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len) 482static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
247{ 483{
248 unsigned long i; 484 unsigned long i;
249 char *needed; 485 char *needed;
250 void *strtbl_void; 486 void *strtbl_void;
251 487
252 if (!show_needed) return; 488 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
253 489
254 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 490 strtbl_void = elf_findsecbyname(elf, ".dynstr");
255 491
256 if (elf->phdr && strtbl_void) { 492 if (elf->phdr && strtbl_void) {
257#define SHOW_NEEDED(B) \ 493#define SHOW_NEEDED(B) \
267 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 503 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
268 dyn = DYN ## B (elf->data + offset); \ 504 dyn = DYN ## B (elf->data + offset); \
269 while (EGET(dyn->d_tag) != DT_NULL) { \ 505 while (EGET(dyn->d_tag) != DT_NULL) { \
270 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 506 if (EGET(dyn->d_tag) == DT_NEEDED) { \
271 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 507 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
272 if (offset >= elf->len) { \ 508 if (offset >= (Elf ## B ## _Off)elf->len) { \
273 ++dyn; \ 509 ++dyn; \
274 continue; \ 510 continue; \
275 } \ 511 } \
276 needed = (char*)(elf->data + offset); \ 512 needed = (char*)(elf->data + offset); \
513 if (op == 0) { \
514 if (!be_wewy_wewy_quiet) { \
277 if (*found_needed) xchrcat(ret, ',', ret_len); \ 515 if (*found_needed) xchrcat(ret, ',', ret_len); \
278 xstrcat(ret, needed, ret_len); \ 516 xstrcat(ret, needed, ret_len); \
517 } \
279 *found_needed = 1; \ 518 *found_needed = 1; \
519 } else { \
520 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
521 *found_lib = 1; \
522 return (be_wewy_wewy_quiet ? NULL : needed); \
523 } \
524 } \
280 } \ 525 } \
281 ++dyn; \ 526 ++dyn; \
282 } \ 527 } \
283 } } 528 } }
284 SHOW_NEEDED(32) 529 SHOW_NEEDED(32)
285 SHOW_NEEDED(64) 530 SHOW_NEEDED(64)
531 if (op == 0 && !*found_needed && be_verbose)
532 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
286 } 533 }
534
535 return NULL;
287} 536}
288static char *scanelf_file_interp(elfobj *elf, char *found_interp) 537static char *scanelf_file_interp(elfobj *elf, char *found_interp)
289{ 538{
290 void *strtbl_void; 539 void *strtbl_void;
291 540
296 if (strtbl_void) { 545 if (strtbl_void) {
297#define SHOW_INTERP(B) \ 546#define SHOW_INTERP(B) \
298 if (elf->elf_class == ELFCLASS ## B) { \ 547 if (elf->elf_class == ELFCLASS ## B) { \
299 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 548 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
300 *found_interp = 1; \ 549 *found_interp = 1; \
301 return elf->data + EGET(strtbl->sh_offset); \ 550 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
302 } 551 }
303 SHOW_INTERP(32) 552 SHOW_INTERP(32)
304 SHOW_INTERP(64) 553 SHOW_INTERP(64)
305 } 554 }
306 return NULL; 555 return NULL;
328 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 577 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
329 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 578 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
330 { \ 579 { \
331 if (be_quiet) return NULL; \ 580 if (be_quiet) return NULL; \
332 *found_bind = 1; \ 581 *found_bind = 1; \
333 return "NOW"; \ 582 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
334 } \ 583 } \
335 ++dyn; \ 584 ++dyn; \
336 } \ 585 } \
337 } \ 586 } \
338 } 587 }
339 SHOW_BIND(32) 588 SHOW_BIND(32)
340 SHOW_BIND(64) 589 SHOW_BIND(64)
341 590
342 fstat(elf->fd, &s); 591 if (be_wewy_wewy_quiet) return NULL;
592
343 if (be_quiet && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { 593 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
344 return NULL; 594 return NULL;
345 } else { 595 } else {
346 *found_bind = 1; 596 *found_bind = 1;
347 return "LAZY"; 597 return (char *) "LAZY";
348 } 598 }
349} 599}
600static char *scanelf_file_soname(elfobj *elf, char *found_soname)
601{
602 unsigned long i;
603 char *soname;
604 void *strtbl_void;
605
606 if (!show_soname) return NULL;
607
608 strtbl_void = elf_findsecbyname(elf, ".dynstr");
609
610 if (elf->phdr && strtbl_void) {
611#define SHOW_SONAME(B) \
612 if (elf->elf_class == ELFCLASS ## B) { \
613 Elf ## B ## _Dyn *dyn; \
614 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
615 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
616 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
617 Elf ## B ## _Off offset; \
618 /* only look for soname in shared objects */ \
619 if (ehdr->e_type != ET_DYN) \
620 return NULL; \
621 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
622 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
623 offset = EGET(phdr[i].p_offset); \
624 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
625 dyn = DYN ## B (elf->data + offset); \
626 while (EGET(dyn->d_tag) != DT_NULL) { \
627 if (EGET(dyn->d_tag) == DT_SONAME) { \
628 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
629 if (offset >= (Elf ## B ## _Off)elf->len) { \
630 ++dyn; \
631 continue; \
632 } \
633 soname = (char*)(elf->data + offset); \
634 *found_soname = 1; \
635 return (be_wewy_wewy_quiet ? NULL : soname); \
636 } \
637 ++dyn; \
638 } \
639 } }
640 SHOW_SONAME(32)
641 SHOW_SONAME(64)
642 }
643
644 return NULL;
645}
350static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename) 646static char *scanelf_file_sym(elfobj *elf, char *found_sym)
351{ 647{
352 unsigned long i; 648 unsigned long i;
353 void *symtab_void, *strtab_void; 649 void *symtab_void, *strtab_void;
354 650
355 if (!find_sym) return NULL; 651 if (!find_sym) return NULL;
356 652
357 symtab_void = elf_findsecbyname(elf, ".symtab"); 653 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
358 strtab_void = elf_findsecbyname(elf, ".strtab");
359 654
360 if (symtab_void && strtab_void) { 655 if (symtab_void && strtab_void) {
361#define FIND_SYM(B) \ 656#define FIND_SYM(B) \
362 if (elf->elf_class == ELFCLASS ## B) { \ 657 if (elf->elf_class == ELFCLASS ## B) { \
363 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 658 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
369 if (sym->st_name) { \ 664 if (sym->st_name) { \
370 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 665 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
371 if (*find_sym == '*') { \ 666 if (*find_sym == '*') { \
372 printf("%s(%s) %5lX %15s %s\n", \ 667 printf("%s(%s) %5lX %15s %s\n", \
373 ((*found_sym == 0) ? "\n\t" : "\t"), \ 668 ((*found_sym == 0) ? "\n\t" : "\t"), \
374 (char *)basename(filename), \ 669 elf->base_filename, \
375 (long)sym->st_size, \ 670 (long)sym->st_size, \
376 (char *)get_elfstttype(sym->st_info), \ 671 (char *)get_elfstttype(sym->st_info), \
377 symname); \ 672 symname); \
378 *found_sym = 1; \ 673 *found_sym = 1; \
379 } else if ((strcmp(find_sym, symname) == 0) || \ 674 } else if ((strcmp(find_sym, symname) == 0) || \
383 ++sym; \ 678 ++sym; \
384 } } 679 } }
385 FIND_SYM(32) 680 FIND_SYM(32)
386 FIND_SYM(64) 681 FIND_SYM(64)
387 } 682 }
683
684 if (be_wewy_wewy_quiet) return NULL;
685
388 if (*find_sym != '*' && *found_sym) 686 if (*find_sym != '*' && *found_sym)
389 return find_sym; 687 return find_sym;
390 if (be_quiet) 688 if (be_quiet)
391 return NULL; 689 return NULL;
392 else 690 else
393 return " - "; 691 return (char *)" - ";
394} 692}
395/* scan an elf file and show all the fun stuff */ 693/* scan an elf file and show all the fun stuff */
396#define prints(str) fputs(str, stdout) 694#define prints(str) write(fileno(stdout), str, strlen(str))
397static void scanelf_file(const char *filename) 695static void scanelf_file(const char *filename)
398{ 696{
399 unsigned long i; 697 unsigned long i;
400 char found_pax, found_stack, found_relro, found_textrel, 698 char found_pax, found_phdr, found_relro, found_load, found_textrel,
401 found_rpath, found_needed, found_interp, found_bind, 699 found_rpath, found_needed, found_interp, found_bind, found_soname,
402 found_sym, found_file; 700 found_sym, found_lib, found_file, found_textrels;
403 elfobj *elf; 701 elfobj *elf;
404 struct stat st; 702 struct stat st;
405 static char *out_buffer = NULL; 703 static char *out_buffer = NULL;
406 static size_t out_len; 704 static size_t out_len;
407 705
409 if (lstat(filename, &st) == -1) { 707 if (lstat(filename, &st) == -1) {
410 if (be_verbose > 2) printf("%s: does not exist\n", filename); 708 if (be_verbose > 2) printf("%s: does not exist\n", filename);
411 return; 709 return;
412 } 710 }
413 /* always handle regular files and handle symlinked files if no -y */ 711 /* always handle regular files and handle symlinked files if no -y */
414 if (!(S_ISREG(st.st_mode) || (S_ISLNK(st.st_mode) && scan_symlink))) { 712 if (S_ISLNK(st.st_mode)) {
713 if (!scan_symlink) return;
714 stat(filename, &st);
715 }
716 if (!S_ISREG(st.st_mode)) {
415 if (be_verbose > 2) printf("%s: skipping non-file\n", filename); 717 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
416 return; 718 return;
417 } 719 }
418 720
419 found_pax = found_stack = found_relro = found_textrel = \ 721 found_pax = found_phdr = found_relro = found_load = found_textrel = \
420 found_rpath = found_needed = found_interp = found_bind = \ 722 found_rpath = found_needed = found_interp = found_bind = found_soname = \
421 found_sym = found_file = 0; 723 found_sym = found_lib = found_file = found_textrels = 0;
422 724
423 /* verify this is real ELF */ 725 /* verify this is real ELF */
424 if ((elf = readelf(filename)) == NULL) { 726 if ((elf = readelf(filename)) == NULL) {
425 if (be_verbose > 2) printf("%s: not an ELF\n", filename); 727 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
426 return; 728 return;
427 } 729 }
428 730
429 if (be_verbose > 1) 731 if (be_verbose > 1)
430 printf("%s: scanning file {%s,%s}\n", filename, 732 printf("%s: scanning file {%s,%s}\n", filename,
431 get_elfeitype(elf, EI_CLASS, elf->elf_class), 733 get_elfeitype(EI_CLASS, elf->elf_class),
432 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA])); 734 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
433 else if (be_verbose) 735 else if (be_verbose)
434 printf("%s: scanning file\n", filename); 736 printf("%s: scanning file\n", filename);
435 737
436 /* init output buffer */ 738 /* init output buffer */
437 if (!out_buffer) { 739 if (!out_buffer) {
441 *out_buffer = '\0'; 743 *out_buffer = '\0';
442 744
443 /* show the header */ 745 /* show the header */
444 if (!be_quiet && show_banner) { 746 if (!be_quiet && show_banner) {
445 for (i = 0; out_format[i]; ++i) { 747 for (i = 0; out_format[i]; ++i) {
446 if (out_format[i] != '%') continue; 748 if (!IS_MODIFIER(out_format[i])) continue;
447 749
448 switch (out_format[++i]) { 750 switch (out_format[++i]) {
449 case '%': break; 751 case '%': break;
752 case '#': break;
753 case 'F':
754 case 'p':
450 case 'F': prints("FILE "); found_file = 1; break; 755 case 'f': prints("FILE "); found_file = 1; break;
451 case 'o': prints(" TYPE "); break; 756 case 'o': prints(" TYPE "); break;
452 case 'x': prints(" PAX "); break; 757 case 'x': prints(" PAX "); break;
453 case 'e': prints("STK/REL "); break; 758 case 'e': prints("STK/REL/PTL "); break;
454 case 't': prints("TEXTREL "); break; 759 case 't': prints("TEXTREL "); break;
455 case 'r': prints("RPATH "); break; 760 case 'r': prints("RPATH "); break;
456 case 'n': prints("NEEDED "); break; 761 case 'n': prints("NEEDED "); break;
457 case 'i': prints("INTERP "); break; 762 case 'i': prints("INTERP "); break;
458 case 'b': prints("BIND "); break; 763 case 'b': prints("BIND "); break;
764 case 'S': prints("SONAME "); break;
459 case 's': prints("SYM "); break; 765 case 's': prints("SYM "); break;
766 case 'N': prints("LIB "); break;
767 case 'T': prints("TEXTRELS "); break;
768 default: warnf("'%c' has no title ?", out_format[i]);
460 } 769 }
461 } 770 }
462 if (!found_file) prints("FILE "); 771 if (!found_file) prints("FILE ");
463 prints("\n"); 772 prints("\n");
464 found_file = 0; 773 found_file = 0;
466 } 775 }
467 776
468 /* dump all the good stuff */ 777 /* dump all the good stuff */
469 for (i = 0; out_format[i]; ++i) { 778 for (i = 0; out_format[i]; ++i) {
470 const char *out; 779 const char *out;
780 const char *tmp;
471 781
472 /* make sure we trim leading spaces in quiet mode */ 782 /* make sure we trim leading spaces in quiet mode */
473 if (be_quiet && *out_buffer == ' ' && !out_buffer[1]) 783 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
474 *out_buffer = '\0'; 784 *out_buffer = '\0';
475 785
476 if (out_format[i] != '%') { 786 if (!IS_MODIFIER(out_format[i])) {
477 xchrcat(&out_buffer, out_format[i], &out_len); 787 xchrcat(&out_buffer, out_format[i], &out_len);
478 continue; 788 continue;
479 } 789 }
480 790
481 out = NULL; 791 out = NULL;
792 be_wewy_wewy_quiet = (out_format[i] == '#');
482 switch (out_format[++i]) { 793 switch (out_format[++i]) {
794 case '%':
795 case '#':
483 case '%': xchrcat(&out_buffer, '%', &out_len); break; 796 xchrcat(&out_buffer, out_format[i], &out_len); break;
484 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break; 797 case 'F':
798 found_file = 1;
799 if (be_wewy_wewy_quiet) break;
800 xstrcat(&out_buffer, filename, &out_len);
801 break;
802 case 'p':
803 found_file = 1;
804 if (be_wewy_wewy_quiet) break;
805 tmp = filename;
806 if (search_path) {
807 ssize_t len_search = strlen(search_path);
808 ssize_t len_file = strlen(filename);
809 if (!strncmp(filename, search_path, len_search) && \
810 len_file > len_search)
811 tmp += len_search;
812 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
813 }
814 xstrcat(&out_buffer, tmp, &out_len);
815 break;
816 case 'f':
817 found_file = 1;
818 if (be_wewy_wewy_quiet) break;
819 tmp = strrchr(filename, '/');
820 tmp = (tmp == NULL ? filename : tmp+1);
821 xstrcat(&out_buffer, tmp, &out_len);
822 break;
485 case 'o': out = get_elfetype(elf); break; 823 case 'o': out = get_elfetype(elf); break;
486 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 824 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
487 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break; 825 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
488 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 826 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
827 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
489 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 828 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
829 case 'n':
490 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break; 830 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
491 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 831 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
492 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 832 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
833 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
493 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break; 834 case 's': out = scanelf_file_sym(elf, &found_sym); break;
835 default: warnf("'%c' has no scan code?", out_format[i]);
494 } 836 }
495 if (out) xstrcat(&out_buffer, out, &out_len); 837 if (out) xstrcat(&out_buffer, out, &out_len);
496 } 838 }
497 839
498 if (!found_file) { 840#define FOUND_SOMETHING() \
499 if (!be_quiet || found_pax || found_stack || found_textrel || \ 841 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
500 found_rpath || found_needed || found_interp || found_bind || \ 842 found_rpath || found_needed || found_interp || found_bind || \
501 found_sym) 843 found_soname || found_sym || found_lib || found_textrels)
502 { 844
845 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
503 xchrcat(&out_buffer, ' ', &out_len); 846 xchrcat(&out_buffer, ' ', &out_len);
504 xstrcat(&out_buffer, filename, &out_len); 847 xstrcat(&out_buffer, filename, &out_len);
505 } 848 }
506 } 849 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
507 if (!(be_quiet && xemptybuffer(out_buffer)))
508 puts(out_buffer); 850 puts(out_buffer);
851 fflush(stdout);
852 }
509 853
510 unreadelf(elf); 854 unreadelf(elf);
511} 855}
512 856
513/* scan a directory for ET_EXEC files and print when we find one */ 857/* scan a directory for ET_EXEC files and print when we find one */
542 while ((dentry = readdir(dir))) { 886 while ((dentry = readdir(dir))) {
543 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 887 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
544 continue; 888 continue;
545 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 889 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
546 if (len >= sizeof(buf)) { 890 if (len >= sizeof(buf)) {
547 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf)); 891 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
892 (unsigned long)len, (unsigned long)sizeof(buf));
548 continue; 893 continue;
549 } 894 }
550 sprintf(buf, "%s/%s", path, dentry->d_name); 895 sprintf(buf, "%s/%s", path, dentry->d_name);
551 if (lstat(buf, &st) != -1) { 896 if (lstat(buf, &st) != -1) {
552 if (S_ISREG(st.st_mode)) 897 if (S_ISREG(st.st_mode))
572 return 1; 917 return 1;
573 918
574 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 919 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
575 if ((p = strchr(path, '\n')) != NULL) 920 if ((p = strchr(path, '\n')) != NULL)
576 *p = 0; 921 *p = 0;
922 search_path = path;
577 scanelf_dir(path); 923 scanelf_dir(path);
578 } 924 }
579 if (fp != stdin) 925 if (fp != stdin)
580 fclose(fp); 926 fclose(fp);
581 return 0; 927 return 0;
653} 999}
654 1000
655 1001
656 1002
657/* usage / invocation handling functions */ 1003/* usage / invocation handling functions */
658#define PARSE_FLAGS "plRmyxetrnibs:aqvF:f:o:BhV" 1004#define PARSE_FLAGS "plRmyxetrnibSs:gN:TaqvF:f:o:BhV"
659#define a_argument required_argument 1005#define a_argument required_argument
660static struct option const long_opts[] = { 1006static struct option const long_opts[] = {
661 {"path", no_argument, NULL, 'p'}, 1007 {"path", no_argument, NULL, 'p'},
662 {"ldpath", no_argument, NULL, 'l'}, 1008 {"ldpath", no_argument, NULL, 'l'},
663 {"recursive", no_argument, NULL, 'R'}, 1009 {"recursive", no_argument, NULL, 'R'},
668 {"textrel", no_argument, NULL, 't'}, 1014 {"textrel", no_argument, NULL, 't'},
669 {"rpath", no_argument, NULL, 'r'}, 1015 {"rpath", no_argument, NULL, 'r'},
670 {"needed", no_argument, NULL, 'n'}, 1016 {"needed", no_argument, NULL, 'n'},
671 {"interp", no_argument, NULL, 'i'}, 1017 {"interp", no_argument, NULL, 'i'},
672 {"bind", no_argument, NULL, 'b'}, 1018 {"bind", no_argument, NULL, 'b'},
1019 {"soname", no_argument, NULL, 'S'},
673 {"symbol", a_argument, NULL, 's'}, 1020 {"symbol", a_argument, NULL, 's'},
1021 {"lib", a_argument, NULL, 'N'},
1022 {"gmatch", no_argument, NULL, 'g'},
1023 {"textrels", no_argument, NULL, 'T'},
674 {"all", no_argument, NULL, 'a'}, 1024 {"all", no_argument, NULL, 'a'},
675 {"quiet", no_argument, NULL, 'q'}, 1025 {"quiet", no_argument, NULL, 'q'},
676 {"verbose", no_argument, NULL, 'v'}, 1026 {"verbose", no_argument, NULL, 'v'},
677 {"format", a_argument, NULL, 'F'}, 1027 {"format", a_argument, NULL, 'F'},
678 {"from", a_argument, NULL, 'f'}, 1028 {"from", a_argument, NULL, 'f'},
679 {"file", a_argument, NULL, 'o'}, 1029 {"file", a_argument, NULL, 'o'},
680 {"nobanner", no_argument, NULL, 'B'}, 1030 {"nobanner", no_argument, NULL, 'B'},
681 {"help", no_argument, NULL, 'h'}, 1031 {"help", no_argument, NULL, 'h'},
682 {"version", no_argument, NULL, 'V'}, 1032 {"version", no_argument, NULL, 'V'},
683 {NULL, no_argument, NULL, 0x0} 1033 {NULL, no_argument, NULL, 0x0}
684}; 1034};
1035
685static char *opts_help[] = { 1036static const char *opts_help[] = {
686 "Scan all directories in PATH environment", 1037 "Scan all directories in PATH environment",
687 "Scan all directories in /etc/ld.so.conf", 1038 "Scan all directories in /etc/ld.so.conf",
688 "Scan directories recursively", 1039 "Scan directories recursively",
689 "Don't recursively cross mount points", 1040 "Don't recursively cross mount points",
690 "Don't scan symlinks\n", 1041 "Don't scan symlinks\n",
691 "Print PaX markings", 1042 "Print PaX markings",
692 "Print GNU_STACK markings", 1043 "Print GNU_STACK/PT_LOAD markings",
693 "Print TEXTREL information", 1044 "Print TEXTREL information",
694 "Print RPATH information", 1045 "Print RPATH information",
695 "Print NEEDED information", 1046 "Print NEEDED information",
696 "Print INTERP information", 1047 "Print INTERP information",
697 "Print BIND information", 1048 "Print BIND information",
1049 "Print SONAME information",
698 "Find a specified symbol", 1050 "Find a specified symbol",
1051 "Find a specified library",
1052 "Use strncmp to match libraries. (use with -N)",
1053 "Locate cause of TEXTREL",
699 "Print all scanned info (-x -e -t -r -n -i)\n", 1054 "Print all scanned info (-x -e -t -r -b)\n",
700 "Only output 'bad' things", 1055 "Only output 'bad' things",
701 "Be verbose (can be specified more than once)", 1056 "Be verbose (can be specified more than once)",
702 "Use specified format for output", 1057 "Use specified format for output",
703 "Read input stream from a filename", 1058 "Read input stream from a filename",
704 "Write output stream to a filename", 1059 "Write output stream to a filename",
725 1080
726 if (status != EXIT_SUCCESS) 1081 if (status != EXIT_SUCCESS)
727 exit(status); 1082 exit(status);
728 1083
729 puts("\nThe format modifiers for the -F option are:"); 1084 puts("\nThe format modifiers for the -F option are:");
730 puts(" %F Filename \t%x PaX Flags \t%e STACK/RELRO"); 1085 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
731 puts(" %t TEXTREL \t%r RPATH \t%n NEEDED"); 1086 puts(" t TEXTREL \tr RPATH \tn NEEDED");
732 puts(" %i INTERP \t%b BIND \t%s symbol"); 1087 puts(" i INTERP \tb BIND \ts symbol");
1088 puts(" N library \to Type \tT TEXTRELs");
1089 puts(" S SONAME");
1090 puts(" p filename (with search path removed)");
1091 puts(" f filename (short name/basename)");
1092 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
733 1093
734 exit(status); 1094 exit(status);
735} 1095}
736 1096
737/* parse command line arguments and preform needed actions */ 1097/* parse command line arguments and preform needed actions */
743 opterr = 0; 1103 opterr = 0;
744 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1104 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
745 switch (i) { 1105 switch (i) {
746 1106
747 case 'V': 1107 case 'V':
748 printf("%s compiled %s\n%s\n" 1108 printf("pax-utils-%s: %s compiled %s\n%s\n"
749 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 1109 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
750 __FILE__, __DATE__, rcsid, argv0); 1110 VERSION, __FILE__, __DATE__, rcsid, argv0);
751 exit(EXIT_SUCCESS); 1111 exit(EXIT_SUCCESS);
752 break; 1112 break;
753 case 'h': usage(EXIT_SUCCESS); break; 1113 case 'h': usage(EXIT_SUCCESS); break;
754 case 'f': 1114 case 'f':
755 if (from_file == NULL) 1115 if (from_file) err("Don't specify -f twice");
756 from_file = xstrdup(optarg); 1116 from_file = xstrdup(optarg);
757 break; 1117 break;
758 case 'o': { 1118 case 'o': {
759 FILE *fp = NULL; 1119 FILE *fp = NULL;
760 fp = freopen(optarg, "w", stdout); 1120 if ((fp = freopen(optarg, "w", stdout)) == NULL)
761 if (fp == NULL)
762 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1121 err("Could not open output stream '%s': %s", optarg, strerror(errno));
763 stdout = fp; 1122 SET_STDOUT(fp);
764 break; 1123 break;
765 } 1124 }
766 1125
767 case 's': { 1126 case 's': {
768 size_t len; 1127 size_t len;
1128 if (find_sym) err("Don't specify -s twice");
769 find_sym = xstrdup(optarg); 1129 find_sym = xstrdup(optarg);
770 len = strlen(find_sym) + 1; 1130 len = strlen(find_sym) + 1;
771 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1)); 1131 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
772 sprintf(versioned_symname, "%s@", find_sym); 1132 sprintf(versioned_symname, "%s@", find_sym);
773 break; 1133 break;
774 } 1134 }
1135 case 'N': {
1136 if (find_lib) err("Don't specify -N twice");
1137 find_lib = xstrdup(optarg);
1138 break;
1139 }
775 1140
776 case 'F': { 1141 case 'F': {
1142 if (out_format) err("Don't specify -F twice");
777 out_format = xstrdup(optarg); 1143 out_format = xstrdup(optarg);
778 break; 1144 break;
779 } 1145 }
780 1146
1147 case 'g': gmatch = 1;
781 case 'y': scan_symlink = 0; break; 1148 case 'y': scan_symlink = 0; break;
782 case 'B': show_banner = 0; break; 1149 case 'B': show_banner = 0; break;
783 case 'l': scan_ldpath = 1; break; 1150 case 'l': scan_ldpath = 1; break;
784 case 'p': scan_envpath = 1; break; 1151 case 'p': scan_envpath = 1; break;
785 case 'R': dir_recurse = 1; break; 1152 case 'R': dir_recurse = 1; break;
786 case 'm': dir_crossmount = 0; break; 1153 case 'm': dir_crossmount = 0; break;
787 case 'x': show_pax = 1; break; 1154 case 'x': show_pax = 1; break;
788 case 'e': show_stack = 1; break; 1155 case 'e': show_phdr = 1; break;
789 case 't': show_textrel = 1; break; 1156 case 't': show_textrel = 1; break;
790 case 'r': show_rpath = 1; break; 1157 case 'r': show_rpath = 1; break;
791 case 'n': show_needed = 1; break; 1158 case 'n': show_needed = 1; break;
792 case 'i': show_interp = 1; break; 1159 case 'i': show_interp = 1; break;
793 case 'b': show_bind = 1; break; 1160 case 'b': show_bind = 1; break;
1161 case 'S': show_soname = 1; break;
1162 case 'T': show_textrels = 1; break;
794 case 'q': be_quiet = 1; break; 1163 case 'q': be_quiet = 1; break;
795 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1164 case 'v': be_verbose = (be_verbose % 20) + 1; break;
796 case 'a': show_pax = show_stack = show_textrel = show_rpath = \ 1165 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
797 show_needed = show_interp = show_bind = 1; break;
798 1166
799 case ':': 1167 case ':':
800 err("Option missing parameter\n"); 1168 err("Option missing parameter\n");
801 case '?': 1169 case '?':
802 err("Unknown option\n"); 1170 err("Unknown option\n");
805 } 1173 }
806 } 1174 }
807 1175
808 /* let the format option override all other options */ 1176 /* let the format option override all other options */
809 if (out_format) { 1177 if (out_format) {
810 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0; 1178 show_pax = show_phdr = show_textrel = show_rpath = \
1179 show_needed = show_interp = show_bind = show_soname = \
1180 show_textrels = 0;
811 for (i = 0; out_format[i]; ++i) { 1181 for (i = 0; out_format[i]; ++i) {
812 if (out_format[i] != '%') continue; 1182 if (!IS_MODIFIER(out_format[i])) continue;
813 1183
814 switch (out_format[++i]) { 1184 switch (out_format[++i]) {
815 case '%': break; 1185 case '%': break;
1186 case '#': break;
816 case 'F': break; 1187 case 'F': break;
1188 case 'p': break;
1189 case 'f': break;
817 case 's': break; 1190 case 's': break;
1191 case 'N': break;
818 case 'o': break; 1192 case 'o': break;
819 case 'x': show_pax = 1; break; 1193 case 'x': show_pax = 1; break;
820 case 'e': show_stack = 1; break; 1194 case 'e': show_phdr = 1; break;
821 case 't': show_textrel = 1; break; 1195 case 't': show_textrel = 1; break;
822 case 'r': show_rpath = 1; break; 1196 case 'r': show_rpath = 1; break;
823 case 'n': show_needed = 1; break; 1197 case 'n': show_needed = 1; break;
824 case 'i': show_interp = 1; break; 1198 case 'i': show_interp = 1; break;
825 case 'b': show_bind = 1; break; 1199 case 'b': show_bind = 1; break;
1200 case 'S': show_soname = 1; break;
1201 case 'T': show_textrels = 1; break;
826 default: 1202 default:
827 err("Invalid format specifier '%c' (byte %i)", 1203 err("Invalid format specifier '%c' (byte %i)",
828 out_format[i], i+1); 1204 out_format[i], i+1);
829 } 1205 }
830 } 1206 }
831 1207
832 /* construct our default format */ 1208 /* construct our default format */
833 } else { 1209 } else {
834 size_t fmt_len = 30; 1210 size_t fmt_len = 30;
835 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 1211 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
836 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 1212 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
837 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 1213 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
838 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len); 1214 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
839 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 1215 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
840 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 1216 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
841 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 1217 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
842 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 1218 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
843 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 1219 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1220 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1221 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
844 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 1222 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1223 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
845 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1224 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
846 } 1225 }
847 if (be_verbose > 2) printf("Format: %s\n", out_format); 1226 if (be_verbose > 2) printf("Format: %s\n", out_format);
848 1227
849 /* now lets actually do the scanning */ 1228 /* now lets actually do the scanning */
850 if (scan_ldpath || (show_rpath && be_quiet)) 1229 if (scan_ldpath || (show_rpath && be_quiet))
856 free(from_file); 1235 free(from_file);
857 from_file = *argv; 1236 from_file = *argv;
858 } 1237 }
859 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 1238 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
860 err("Nothing to scan !?"); 1239 err("Nothing to scan !?");
861 while (optind < argc) 1240 while (optind < argc) {
862 scanelf_dir(argv[optind++]); 1241 search_path = argv[optind++];
1242 scanelf_dir(search_path);
1243 }
863 1244
864 /* clean up */ 1245 /* clean up */
865 if (find_sym) { 1246 if (find_sym) {
866 free(find_sym); 1247 free(find_sym);
867 free(versioned_symname); 1248 free(versioned_symname);
868 } 1249 }
1250 if (find_lib) free(find_lib);
869 if (out_format) free(out_format); 1251 if (out_format) free(out_format);
870 for (i = 0; ldpaths[i]; ++i) 1252 for (i = 0; ldpaths[i]; ++i)
871 free(ldpaths[i]); 1253 free(ldpaths[i]);
872} 1254}
873 1255
874 1256
875 1257
876/* utility funcs */ 1258/* utility funcs */
877static char *xstrdup(char *s) 1259static char *xstrdup(const char *s)
878{ 1260{
879 char *ret = strdup(s); 1261 char *ret = strdup(s);
880 if (!ret) err("Could not strdup(): %s", strerror(errno)); 1262 if (!ret) err("Could not strdup(): %s", strerror(errno));
881 return ret; 1263 return ret;
882} 1264}
1265
883static void *xmalloc(size_t size) 1266static void *xmalloc(size_t size)
884{ 1267{
885 void *ret = malloc(size); 1268 void *ret = malloc(size);
886 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 1269 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
887 return ret; 1270 return ret;
888} 1271}
1272
889static void xstrcat(char **dst, const char *src, size_t *curr_len) 1273static void xstrcat(char **dst, const char *src, size_t *curr_len)
890{ 1274{
891 long new_len; 1275 size_t new_len;
892 1276
893 new_len = strlen(*dst) + strlen(src); 1277 new_len = strlen(*dst) + strlen(src);
894 if (*curr_len <= new_len) { 1278 if (*curr_len <= new_len) {
895 *curr_len = new_len + (*curr_len / 2); 1279 *curr_len = new_len + (*curr_len / 2);
896 *dst = realloc(*dst, *curr_len); 1280 *dst = realloc(*dst, *curr_len);
898 err("could not realloc %li bytes", (unsigned long)*curr_len); 1282 err("could not realloc %li bytes", (unsigned long)*curr_len);
899 } 1283 }
900 1284
901 strcat(*dst, src); 1285 strcat(*dst, src);
902} 1286}
1287
903static inline void xchrcat(char **dst, const char append, size_t *curr_len) 1288static inline void xchrcat(char **dst, const char append, size_t *curr_len)
904{ 1289{
905 static char my_app[2]; 1290 static char my_app[2];
906 my_app[0] = append; 1291 my_app[0] = append;
907 my_app[1] = '\0'; 1292 my_app[1] = '\0';
908 xstrcat(dst, my_app, curr_len); 1293 xstrcat(dst, my_app, curr_len);
909} 1294}
910static int xemptybuffer(const char *buff)
911{
912 long i;
913 for (i = 0; buff[i]; ++i)
914 if (buff[i] != ' ')
915 return 0;
916 return 1;
917}
918 1295
919 1296
920 1297
921int main(int argc, char *argv[]) 1298int main(int argc, char *argv[])
922{ 1299{
923 if (argc < 2) 1300 if (argc < 2)
924 usage(EXIT_FAILURE); 1301 usage(EXIT_FAILURE);
925 parseargs(argc, argv); 1302 parseargs(argc, argv);
926 fclose(stdout); 1303 fclose(stdout);
1304#ifdef __BOUNDS_CHECKING_ON
1305 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1306#endif
927 return EXIT_SUCCESS; 1307 return EXIT_SUCCESS;
928} 1308}

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