/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.35 Revision 1.84
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 1.35 2005/04/14 00:17:30 solar Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.84 2005/07/22 00:10:51 vapier Exp $
6 * 5 *
7 ******************************************************************** 6 ********************************************************************
8 * This program is free software; you can redistribute it and/or 7 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as 8 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the 9 * published by the Free Software Foundation; either version 2 of the
22 */ 21 */
23 22
24#include <stdio.h> 23#include <stdio.h>
25#include <stdlib.h> 24#include <stdlib.h>
26#include <sys/types.h> 25#include <sys/types.h>
26#include <libgen.h>
27#include <limits.h>
27#define __USE_GNU 28#define __USE_GNU
28#include <string.h> 29#include <string.h>
29#include <errno.h> 30#include <errno.h>
30#include <unistd.h> 31#include <unistd.h>
31#include <sys/stat.h> 32#include <sys/stat.h>
32#include <dirent.h> 33#include <dirent.h>
33#include <getopt.h> 34#include <getopt.h>
34#include <assert.h> 35#include <assert.h>
35
36#include "paxelf.h" 36#include "paxelf.h"
37 37
38static const char *rcsid = "$Id: scanelf.c,v 1.35 2005/04/14 00:17:30 solar Exp $"; 38static const char *rcsid = "$Id: scanelf.c,v 1.84 2005/07/22 00:10:51 vapier Exp $";
39#define argv0 "scanelf"
39 40
40 41#define IS_MODIFIER(c) (c == '%' || c == '#')
41/* helper functions for showing errors */
42#define argv0 "scanelf" /*((*argv != NULL) ? argv[0] : __FILE__ "\b\b")*/
43#define warn(fmt, args...) \
44 fprintf(stderr, "%s: " fmt "\n", argv0, ## args)
45#define warnf(fmt, args...) warn("%s(): " fmt, __FUNCTION__, ## args)
46#define err(fmt, args...) \
47 do { \
48 warn(fmt, ## args); \
49 exit(EXIT_FAILURE); \
50 } while (0)
51 42
52 43
53 44
54/* prototypes */ 45/* prototypes */
55static void scanelf_file(const char *filename); 46static void scanelf_file(const char *filename);
56static void scanelf_dir(const char *path); 47static void scanelf_dir(const char *path);
57static void scanelf_ldpath(); 48static void scanelf_ldpath();
58static void scanelf_envpath(); 49static void scanelf_envpath();
59static void usage(int status); 50static void usage(int status);
60static void parseargs(int argc, char *argv[]); 51static void parseargs(int argc, char *argv[]);
52static char *xstrdup(const char *s);
53static void *xmalloc(size_t size);
54static void xstrcat(char **dst, const char *src, size_t *curr_len);
55static inline void xchrcat(char **dst, const char append, size_t *curr_len);
61 56
62/* variables to control behavior */ 57/* variables to control behavior */
58static char *ldpaths[256];
63static char scan_ldpath = 0; 59static char scan_ldpath = 0;
64static char scan_envpath = 0; 60static char scan_envpath = 0;
61static char scan_symlink = 1;
65static char dir_recurse = 0; 62static char dir_recurse = 0;
66static char dir_crossmount = 1; 63static char dir_crossmount = 1;
67static char show_pax = 0; 64static char show_pax = 0;
68static char show_stack = 0; 65static char show_phdr = 0;
69static char show_textrel = 0; 66static char show_textrel = 0;
70static char show_rpath = 0; 67static char show_rpath = 0;
71static char show_needed = 0; 68static char show_needed = 0;
69static char show_interp = 0;
70static char show_bind = 0;
71static char show_soname = 0;
72static char show_textrels = 0;
72static char show_banner = 1; 73static char show_banner = 1;
73static char be_quiet = 0; 74static char be_quiet = 0;
74static char be_verbose = 0; 75static char be_verbose = 0;
76static char be_wewy_wewy_quiet = 0;
77static char *find_sym = NULL, *versioned_symname = NULL;
75static char *find_sym = NULL; 78static char *find_lib = NULL;
79static char *out_format = NULL;
80static char *search_path = NULL;
76 81
77 82
78 83
79/* scan an elf file and show all the fun stuff */ 84/* sub-funcs for scanelf_file() */
80static void scanelf_file(const char *filename) 85static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
81{ 86{
82 int i; 87 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
83 char found_pax, found_stack, found_relro, found_textrel, 88#define GET_SYMTABS(B) \
84 found_rpath, found_needed, found_sym; 89 if (elf->elf_class == ELFCLASS ## B) { \
85 elfobj *elf; 90 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
91 /* debug sections */ \
92 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
93 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
94 /* runtime sections */ \
95 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
96 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
97 if (symtab && dynsym) { \
98 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
99 } else { \
100 *sym = (void*)(symtab ? symtab : dynsym); \
101 } \
102 if (strtab && dynstr) { \
103 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
104 } else { \
105 *tab = (void*)(strtab ? strtab : dynstr); \
106 } \
107 }
108 GET_SYMTABS(32)
109 GET_SYMTABS(64)
110}
111static char *scanelf_file_pax(elfobj *elf, char *found_pax)
112{
113 static char *paxflags;
114 static char ret[7];
115 unsigned long i, shown;
116
117 if (!show_pax) return NULL;
118
119 shown = 0;
120 memset(&ret, 0, sizeof(ret));
121
122 if (elf->phdr) {
123#define SHOW_PAX(B) \
124 if (elf->elf_class == ELFCLASS ## B) { \
125 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
126 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
127 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
128 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
129 continue; \
130 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \
131 continue; \
132 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
133 *found_pax = 1; \
134 ++shown; \
135 break; \
136 } \
137 }
138 SHOW_PAX(32)
139 SHOW_PAX(64)
140 }
141
142 /* fall back to EI_PAX if no PT_PAX was found */
143 if (!*ret) {
144 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
145 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
146 *found_pax = 1;
147 return paxflags;
148 }
149 strncpy(ret, paxflags, sizeof(ret));
150 }
151
152 if (be_quiet && !shown)
153 return NULL;
154 return ret;
155
156}
157static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
158{
159 static char ret[12];
160 char *found;
161 unsigned long i, off, shown, check_flags;
162 unsigned char multi_stack, multi_relro, multi_load;
163
164 if (!show_phdr) return NULL;
165
166 memcpy(ret, "--- --- ---\0", 12);
167
168 shown = 0;
169 multi_stack = multi_relro = multi_load = 0;
170
171 if (elf->phdr) {
172#define SHOW_PHDR(B) \
173 if (elf->elf_class == ELFCLASS ## B) { \
174 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
175 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
176 uint32_t flags; \
177 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
178 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
179 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
180 found = found_phdr; \
181 off = 0; \
182 check_flags = PF_X; \
183 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
184 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
185 found = found_relro; \
186 off = 4; \
187 check_flags = PF_X; \
188 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
189 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \
190 found = found_load; \
191 off = 8; \
192 check_flags = PF_W|PF_X; \
193 } else \
194 continue; \
195 flags = EGET(phdr[i].p_flags); \
196 if (be_quiet && ((flags & check_flags) != check_flags)) \
197 continue; \
198 memcpy(ret+off, gnu_short_stack_flags(flags), 3); \
199 *found = 1; \
200 ++shown; \
201 } \
202 }
203 SHOW_PHDR(32)
204 SHOW_PHDR(64)
205 }
206
207 if (be_quiet && !shown)
208 return NULL;
209 else
210 return ret;
211}
212static char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
213{
214 static char ret[] = "TEXTREL";
215 unsigned long i;
216
217 if (!show_textrel && !show_textrels) return NULL;
218
219 if (elf->phdr) {
220#define SHOW_TEXTREL(B) \
221 if (elf->elf_class == ELFCLASS ## B) { \
222 Elf ## B ## _Dyn *dyn; \
223 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
224 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
225 Elf ## B ## _Off offset; \
226 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
227 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
228 offset = EGET(phdr[i].p_offset); \
229 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
230 dyn = DYN ## B (elf->data + offset); \
231 while (EGET(dyn->d_tag) != DT_NULL) { \
232 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
233 *found_textrel = 1; \
234 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
235 return (be_wewy_wewy_quiet ? NULL : ret); \
236 } \
237 ++dyn; \
238 } \
239 } }
240 SHOW_TEXTREL(32)
241 SHOW_TEXTREL(64)
242 }
243
244 if (be_quiet || be_wewy_wewy_quiet)
245 return NULL;
246 else
247 return (char *)" - ";
248}
249static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
250{
251 unsigned long s, r, rmax;
252 void *symtab_void, *strtab_void, *text_void;
253
254 if (!show_textrels) return NULL;
255
256 /* don't search for TEXTREL's if the ELF doesn't have any */
257 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
258 if (!*found_textrel) return NULL;
259
260 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
261 text_void = elf_findsecbyname(elf, ".text");
262
263 if (symtab_void && strtab_void && text_void && elf->shdr) {
264#define SHOW_TEXTRELS(B) \
265 if (elf->elf_class == ELFCLASS ## B) { \
266 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
267 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
268 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
269 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
270 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
271 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
272 uint ## B ## _t memsz = EGET(text->sh_size); \
273 Elf ## B ## _Rel *rel; \
274 Elf ## B ## _Rela *rela; \
275 /* search the section headers for relocations */ \
276 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
277 uint32_t sh_type = EGET(shdr[s].sh_type); \
278 if (sh_type == SHT_REL) { \
279 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
280 rela = NULL; \
281 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
282 } else if (sh_type == SHT_RELA) { \
283 rel = NULL; \
284 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
285 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
286 } else \
287 continue; \
288 /* now see if any of the relocs are in the .text */ \
289 for (r = 0; r < rmax; ++r) { \
290 unsigned long sym_max; \
291 Elf ## B ## _Addr offset_tmp; \
292 Elf ## B ## _Sym *func; \
293 Elf ## B ## _Sym *sym; \
294 Elf ## B ## _Addr r_offset; \
295 uint ## B ## _t r_info; \
296 if (sh_type == SHT_REL) { \
297 r_offset = EGET(rel[r].r_offset); \
298 r_info = EGET(rel[r].r_info); \
299 } else { \
300 r_offset = EGET(rela[r].r_offset); \
301 r_info = EGET(rela[r].r_info); \
302 } \
303 /* make sure this relocation is inside of the .text */ \
304 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
305 if (be_verbose <= 2) continue; \
306 } else \
307 *found_textrels = 1; \
308 /* locate this relocation symbol name */ \
309 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
310 sym_max = ELF ## B ## _R_SYM(r_info); \
311 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
312 sym += sym_max; \
313 else \
314 sym = NULL; \
315 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
316 /* show the raw details about this reloc */ \
317 printf("\tTEXTREL %s: ", elf->base_filename); \
318 if (sym && sym->st_name) \
319 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
320 else \
321 printf("(NULL: fake?)"); \
322 printf(" [0x%lX]", (unsigned long)r_offset); \
323 /* now try to find the closest symbol that this rel is probably in */ \
324 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
325 func = NULL; \
326 offset_tmp = 0; \
327 while (sym_max--) { \
328 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
329 func = sym; \
330 offset_tmp = EGET(sym->st_value); \
331 } \
332 ++sym; \
333 } \
334 printf(" in "); \
335 if (func && func->st_name) \
336 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
337 else \
338 printf("(NULL: fake?)"); \
339 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
340 } \
341 } }
342 SHOW_TEXTRELS(32)
343 SHOW_TEXTRELS(64)
344 }
345 if (!*found_textrels)
346 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
347
348 return NULL;
349}
350
351static void rpath_security_checks(elfobj *, char *);
352static void rpath_security_checks(elfobj *elf, char *item) {
86 struct stat st; 353 struct stat st;
87 354 switch (*item) {
88 /* make sure path exists */ 355 case 0:
89 if (lstat(filename, &st) == -1) 356 warnf("Security problem NULL RPATH in %s", elf->filename);
90 return; 357 break;
91 if (!S_ISREG(st.st_mode)) 358 case '/': break;
92 return; 359 case '$':
93 found_pax = found_stack = found_relro = found_textrel = \ 360 if (fstat(elf->fd, &st) != -1)
94 found_rpath = found_needed = found_sym = 0; 361 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
95 362 warnf("Security problem with RPATH='%s' in %s with mode set of %o",
96 /* verify this is real ELF */ 363 item, elf->filename, st.st_mode & 07777);
97 if ((elf = readelf(filename)) == NULL) { 364 break;
98 if (be_verbose > 2) printf("%s: not an ELF\n", filename); 365 default:
99 return; 366 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename);
100 } 367 break;
101
102 if (be_verbose > 1)
103 printf("%s: {%s,%s} scanning file\n", filename,
104 get_elfeitype(elf, EI_CLASS, elf->elf_class),
105 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA]));
106 else if (be_verbose)
107 printf("%s: scanning file\n", filename);
108
109 /* show the header */
110 if (!be_quiet && show_banner) {
111 printf(" TYPE ");
112 if (show_pax) printf(" PAX ");
113 if (show_stack) printf("STK/REL ");
114 if (show_textrel) printf("TEXTREL ");
115 if (show_rpath) printf("RPATH ");
116 if (show_needed) printf("NEEDED ");
117 printf(" FILE\n");
118 show_banner = 0;
119 }
120
121 /* dump all the good stuff */
122 if (!be_quiet)
123 printf("%-7s ", get_elfetype(elf));
124
125 if (show_pax) {
126 char *paxflags = pax_short_hf_flags(PAX_FLAGS(elf));
127 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) {
128 found_pax = 1;
129 printf("%s ", pax_short_hf_flags(PAX_FLAGS(elf)));
130 } 368 }
131 } 369}
132 370static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
133 /* stack fun */ 371{
134 if (show_stack) { 372 unsigned long i, s;
135#define SHOW_STACK(B) \
136 if (elf->elf_class == ELFCLASS ## B) { \
137 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
138 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
139 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
140 if (EGET(phdr[i].p_type) != PT_GNU_STACK && \
141 EGET(phdr[i].p_type) != PT_GNU_RELRO) continue; \
142 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \
143 continue; \
144 if (EGET(phdr[i].p_type) == PT_GNU_STACK) \
145 found_stack = 1; \
146 if (EGET(phdr[i].p_type) == PT_GNU_RELRO) \
147 found_relro = 1; \
148 printf("%s ", gnu_short_stack_flags(EGET(phdr[i].p_flags))); \
149 } \
150 }
151 SHOW_STACK(32)
152 SHOW_STACK(64)
153 if (!be_quiet && !found_stack) printf("--- ");
154 if (!be_quiet && !found_relro) printf("--- ");
155 }
156
157 /* textrel fun */
158 if (show_textrel) {
159#define SHOW_TEXTREL(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Dyn *dyn; \
162 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
163 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
164 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
165 if (phdr[i].p_type != PT_DYNAMIC) continue; \
166 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
167 while (EGET(dyn->d_tag) != DT_NULL) { \
168 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
169 found_textrel = 1; \
170 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
171 fputs("TEXTREL ", stdout); \
172 } \
173 ++dyn; \
174 } \
175 } }
176 SHOW_TEXTREL(32)
177 SHOW_TEXTREL(64)
178 if (!be_quiet && !found_textrel) fputs("------- ", stdout);
179 }
180
181 /* rpath fun */
182 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */
183 if (show_rpath) {
184 char *rpath, *runpath; 373 char *rpath, *runpath, **r;
374 void *strtbl_void;
375
376 if (!show_rpath) return;
377
185 void *strtbl_void = elf_findsecbyname(elf, ".dynstr"); 378 strtbl_void = elf_findsecbyname(elf, ".dynstr");
186 rpath = runpath = NULL; 379 rpath = runpath = NULL;
187 380
188 if (strtbl_void) { 381 if (elf->phdr && strtbl_void) {
189#define SHOW_RPATH(B) \ 382#define SHOW_RPATH(B) \
190 if (elf->elf_class == ELFCLASS ## B) { \ 383 if (elf->elf_class == ELFCLASS ## B) { \
191 Elf ## B ## _Dyn *dyn; \ 384 Elf ## B ## _Dyn *dyn; \
192 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 385 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
193 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 386 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
194 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 387 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
388 Elf ## B ## _Off offset; \
389 Elf ## B ## _Xword word; \
390 /* Scan all the program headers */ \
195 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 391 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
392 /* Just scan dynamic headers */ \
196 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 393 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
394 offset = EGET(phdr[i].p_offset); \
395 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
396 /* Just scan dynamic RPATH/RUNPATH headers */ \
197 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 397 dyn = DYN ## B (elf->data + offset); \
198 while (EGET(dyn->d_tag) != DT_NULL) { \ 398 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
199 if (EGET(dyn->d_tag) == DT_RPATH) { \ 399 if (word == DT_RPATH) { \
400 r = &rpath; \
401 } else if (word == DT_RUNPATH) { \
402 r = &runpath; \
403 } else { \
404 ++dyn; \
405 continue; \
406 } \
407 /* Verify the memory is somewhat sane */ \
200 rpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 408 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
409 if (offset < (Elf ## B ## _Off)elf->len) { \
410 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
411 *r = (char*)(elf->data + offset); \
412 /* If quiet, don't output paths in ld.so.conf */ \
413 if (be_quiet) { \
414 size_t len; \
415 char *start, *end; \
416 /* note that we only 'chop' off leading known paths. */ \
417 /* since *r is read-only memory, we can only move the ptr forward. */ \
418 start = *r; \
419 /* scan each path in : delimited list */ \
420 while (start) { \
421 rpath_security_checks(elf, start); \
422 end = strchr(start, ':'); \
423 len = (end ? abs(end - start) : strlen(start)); \
424 for (s = 0; ldpaths[s]; ++s) { \
425 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
426 *r = (end ? end + 1 : NULL); \
427 break; \
428 } \
429 } \
430 if (!*r || !ldpaths[s] || !end) \
431 start = NULL; \
432 else \
433 start = start + len + 1; \
434 } \
435 } \
201 found_rpath = 1; \ 436 if (*r) *found_rpath = 1; \
202 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \
203 runpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
204 found_rpath = 1; \
205 } \ 437 } \
206 ++dyn; \ 438 ++dyn; \
207 } \ 439 } \
208 } } 440 } }
209 SHOW_RPATH(32) 441 SHOW_RPATH(32)
210 SHOW_RPATH(64) 442 SHOW_RPATH(64)
211 } 443 }
444
445 if (be_wewy_wewy_quiet) return;
446
212 if (rpath && runpath) { 447 if (rpath && runpath) {
213 if (!strcmp(rpath, runpath)) 448 if (!strcmp(rpath, runpath)) {
214 printf("%-5s ", runpath); 449 xstrcat(ret, runpath, ret_len);
215 else { 450 } else {
216 fprintf(stderr, "%s's RPATH [%s] != RUNPATH [%s]\n", filename, rpath, runpath); 451 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
217 printf("{%s,%s} ", rpath, runpath); 452 xchrcat(ret, '{', ret_len);
453 xstrcat(ret, rpath, ret_len);
454 xchrcat(ret, ',', ret_len);
455 xstrcat(ret, runpath, ret_len);
456 xchrcat(ret, '}', ret_len);
218 } 457 }
219 } else if (rpath || runpath) 458 } else if (rpath || runpath)
220 printf("%-5s ", (runpath ? runpath : rpath)); 459 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
221 else if (!be_quiet && !found_rpath) 460 else if (!be_quiet)
222 printf(" - "); 461 xstrcat(ret, " - ", ret_len);
223 } 462}
224 463static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
225 /* print out all the NEEDED entries */ 464{
226 if (show_needed) { 465 unsigned long i;
227 char *needed; 466 char *needed;
467 void *strtbl_void;
468
469 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
470
228 void *strtbl_void = elf_findsecbyname(elf, ".dynstr"); 471 strtbl_void = elf_findsecbyname(elf, ".dynstr");
229 472
230 if (strtbl_void) { 473 if (elf->phdr && strtbl_void) {
231#define SHOW_NEEDED(B) \ 474#define SHOW_NEEDED(B) \
232 if (elf->elf_class == ELFCLASS ## B) { \ 475 if (elf->elf_class == ELFCLASS ## B) { \
233 Elf ## B ## _Dyn *dyn; \ 476 Elf ## B ## _Dyn *dyn; \
234 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 477 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
235 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 478 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
236 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 479 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
480 Elf ## B ## _Off offset; \
237 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 481 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
238 if (be_verbose && EGET(phdr[i].p_type) == PT_INTERP) { \
239 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
240 printf("%s\n", elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr)); \
241 exit(0); \
242 } \
243 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 482 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
483 offset = EGET(phdr[i].p_offset); \
484 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
244 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 485 dyn = DYN ## B (elf->data + offset); \
245 while (EGET(dyn->d_tag) != DT_NULL) { \ 486 while (EGET(dyn->d_tag) != DT_NULL) { \
246 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 487 if (EGET(dyn->d_tag) == DT_NEEDED) { \
247 needed = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 488 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
248 if (found_needed) printf(","); \ 489 if (offset >= (Elf ## B ## _Off)elf->len) { \
249 printf("%s", needed); \ 490 ++dyn; \
491 continue; \
492 } \
493 needed = (char*)(elf->data + offset); \
494 if (op == 0) { \
495 if (!be_wewy_wewy_quiet) { \
496 if (*found_needed) xchrcat(ret, ',', ret_len); \
497 xstrcat(ret, needed, ret_len); \
498 } \
250 found_needed = 1; \ 499 *found_needed = 1; \
500 } else { \
501 if (!strcmp(find_lib, needed)) { \
502 *found_lib = 1; \
503 return (be_wewy_wewy_quiet ? NULL : find_lib); \
504 } \
505 } \
251 } \ 506 } \
252 ++dyn; \ 507 ++dyn; \
253 } \ 508 } \
254 } } 509 } }
255 SHOW_NEEDED(32) 510 SHOW_NEEDED(32)
256 SHOW_NEEDED(64) 511 SHOW_NEEDED(64)
512#if 0
513 if (op == 0 && !*found_needed)
514 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
515#endif
257 } 516 }
258 if (!be_quiet && !found_needed) 517
259 printf(" - "); 518 return NULL;
260 else if (found_needed) 519}
261 printf(" "); 520static char *scanelf_file_interp(elfobj *elf, char *found_interp)
521{
522 void *strtbl_void;
523
524 if (!show_interp) return NULL;
525
526 strtbl_void = elf_findsecbyname(elf, ".interp");
527
528 if (strtbl_void) {
529#define SHOW_INTERP(B) \
530 if (elf->elf_class == ELFCLASS ## B) { \
531 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
532 *found_interp = 1; \
533 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
262 } 534 }
535 SHOW_INTERP(32)
536 SHOW_INTERP(64)
537 }
538 return NULL;
539}
540static char *scanelf_file_bind(elfobj *elf, char *found_bind)
541{
542 unsigned long i;
543 struct stat s;
263 544
264 /* search the symbol table for a specified symbol */ 545 if (!show_bind) return NULL;
265 if (find_sym) { 546 if (!elf->phdr) return NULL;
547
548#define SHOW_BIND(B) \
549 if (elf->elf_class == ELFCLASS ## B) { \
550 Elf ## B ## _Dyn *dyn; \
551 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
552 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
553 Elf ## B ## _Off offset; \
554 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
555 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
556 offset = EGET(phdr[i].p_offset); \
557 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
558 dyn = DYN ## B (elf->data + offset); \
559 while (EGET(dyn->d_tag) != DT_NULL) { \
560 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
561 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
562 { \
563 if (be_quiet) return NULL; \
564 *found_bind = 1; \
565 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
566 } \
567 ++dyn; \
568 } \
569 } \
570 }
571 SHOW_BIND(32)
572 SHOW_BIND(64)
573
574 if (be_wewy_wewy_quiet) return NULL;
575
576 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
577 return NULL;
578 } else {
579 *found_bind = 1;
580 return (char *) "LAZY";
581 }
582}
583static char *scanelf_file_soname(elfobj *elf, char *found_soname)
584{
585 unsigned long i;
586 char *soname;
587 void *strtbl_void;
588
589 if (!show_soname) return NULL;
590
591 strtbl_void = elf_findsecbyname(elf, ".dynstr");
592
593 if (elf->phdr && strtbl_void) {
594#define SHOW_SONAME(B) \
595 if (elf->elf_class == ELFCLASS ## B) { \
596 Elf ## B ## _Dyn *dyn; \
597 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
598 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
599 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
600 Elf ## B ## _Off offset; \
601 /* only look for soname in shared objects */ \
602 if (ehdr->e_type != ET_DYN) \
603 return NULL; \
604 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
605 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
606 offset = EGET(phdr[i].p_offset); \
607 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
608 dyn = DYN ## B (elf->data + offset); \
609 while (EGET(dyn->d_tag) != DT_NULL) { \
610 if (EGET(dyn->d_tag) == DT_SONAME) { \
611 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
612 if (offset >= (Elf ## B ## _Off)elf->len) { \
613 ++dyn; \
614 continue; \
615 } \
616 soname = (char*)(elf->data + offset); \
617 *found_soname = 1; \
618 return (be_wewy_wewy_quiet ? NULL : soname); \
619 } \
620 ++dyn; \
621 } \
622 } }
623 SHOW_SONAME(32)
624 SHOW_SONAME(64)
625 }
626
627 return NULL;
628}
629static char *scanelf_file_sym(elfobj *elf, char *found_sym)
630{
631 unsigned long i;
266 void *symtab_void, *strtab_void; 632 void *symtab_void, *strtab_void;
267 char *versioned_symname;
268 size_t len;
269 633
270 len = strlen(find_sym) + 1; 634 if (!find_sym) return NULL;
271 versioned_symname = (char *)malloc(sizeof(char) * (len+1));
272 if (!versioned_symname) {
273 warnf("Could not malloc() mem for sym scan");
274 return;
275 }
276 sprintf(versioned_symname, "%s@", find_sym);
277 635
278 symtab_void = elf_findsecbyname(elf, ".symtab"); 636 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
279 strtab_void = elf_findsecbyname(elf, ".strtab");
280 637
281 if (symtab_void && strtab_void) { 638 if (symtab_void && strtab_void) {
282#define FIND_SYM(B) \ 639#define FIND_SYM(B) \
283 if (elf->elf_class == ELFCLASS ## B) { \ 640 if (elf->elf_class == ELFCLASS ## B) { \
284 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 641 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
285 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 642 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
286 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 643 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
287 int cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 644 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
288 char *symname; \ 645 char *symname; \
289 for (i = 0; i < cnt; ++i) { \ 646 for (i = 0; i < cnt; ++i) { \
290 if (sym->st_name) { \ 647 if (sym->st_name) { \
291 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 648 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
292 if (*find_sym == '*') { \ 649 if (*find_sym == '*') { \
293 printf("%s(%s) %5lX %15s %s\n", \ 650 printf("%s(%s) %5lX %15s %s\n", \
294 ((found_sym == 0) ? "\n\t" : "\t"), \ 651 ((*found_sym == 0) ? "\n\t" : "\t"), \
295 (char *)basename(filename), \ 652 elf->base_filename, \
296 (long)sym->st_size, \ 653 (long)sym->st_size, \
297 (char *)get_elfstttype(sym->st_info), \ 654 (char *)get_elfstttype(sym->st_info), \
298 symname); \ 655 symname); \
299 found_sym = 1; \ 656 *found_sym = 1; \
300 } else if ((strcmp(find_sym, symname) == 0) || \ 657 } else if ((strcmp(find_sym, symname) == 0) || \
301 (strncmp(symname, versioned_symname, len) == 0)) \ 658 (strcmp(symname, versioned_symname) == 0)) \
302 found_sym++; \ 659 (*found_sym)++; \
303 } \ 660 } \
304 ++sym; \ 661 ++sym; \
305 } } 662 } }
306 FIND_SYM(32) 663 FIND_SYM(32)
307 FIND_SYM(64) 664 FIND_SYM(64)
665 }
666
667 if (be_wewy_wewy_quiet) return NULL;
668
669 if (*find_sym != '*' && *found_sym)
670 return find_sym;
671 if (be_quiet)
672 return NULL;
673 else
674 return (char *)" - ";
675}
676/* scan an elf file and show all the fun stuff */
677#define prints(str) write(fileno(stdout), str, strlen(str))
678static void scanelf_file(const char *filename)
679{
680 unsigned long i;
681 char found_pax, found_phdr, found_relro, found_load, found_textrel,
682 found_rpath, found_needed, found_interp, found_bind, found_soname,
683 found_sym, found_lib, found_file, found_textrels;
684 elfobj *elf;
685 struct stat st;
686 static char *out_buffer = NULL;
687 static size_t out_len;
688
689 /* make sure 'filename' exists */
690 if (lstat(filename, &st) == -1) {
691 if (be_verbose > 2) printf("%s: does not exist\n", filename);
692 return;
693 }
694 /* always handle regular files and handle symlinked files if no -y */
695 if (S_ISLNK(st.st_mode)) {
696 if (!scan_symlink) return;
697 stat(filename, &st);
698 }
699 if (!S_ISREG(st.st_mode)) {
700 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
701 return;
702 }
703
704 found_pax = found_phdr = found_relro = found_load = found_textrel = \
705 found_rpath = found_needed = found_interp = found_bind = found_soname = \
706 found_sym = found_lib = found_file = found_textrels = 0;
707
708 /* verify this is real ELF */
709 if ((elf = readelf(filename)) == NULL) {
710 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
711 return;
712 }
713
714 if (be_verbose > 1)
715 printf("%s: scanning file {%s,%s}\n", filename,
716 get_elfeitype(EI_CLASS, elf->elf_class),
717 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
718 else if (be_verbose)
719 printf("%s: scanning file\n", filename);
720
721 /* init output buffer */
722 if (!out_buffer) {
723 out_len = sizeof(char) * 80;
724 out_buffer = (char*)xmalloc(out_len);
725 }
726 *out_buffer = '\0';
727
728 /* show the header */
729 if (!be_quiet && show_banner) {
730 for (i = 0; out_format[i]; ++i) {
731 if (!IS_MODIFIER(out_format[i])) continue;
732
733 switch (out_format[++i]) {
734 case '%': break;
735 case '#': break;
736 case 'F':
737 case 'p':
738 case 'f': prints("FILE "); found_file = 1; break;
739 case 'o': prints(" TYPE "); break;
740 case 'x': prints(" PAX "); break;
741 case 'e': prints("STK/REL/PTL "); break;
742 case 't': prints("TEXTREL "); break;
743 case 'r': prints("RPATH "); break;
744 case 'n': prints("NEEDED "); break;
745 case 'i': prints("INTERP "); break;
746 case 'b': prints("BIND "); break;
747 case 'S': prints("SONAME "); break;
748 case 's': prints("SYM "); break;
749 case 'N': prints("LIB "); break;
750 case 'T': prints("TEXTRELS "); break;
751 default: warnf("'%c' has no title ?", out_format[i]);
308 } 752 }
309 free(versioned_symname); 753 }
310 if (*find_sym != '*') { 754 if (!found_file) prints("FILE ");
311 if (found_sym) 755 prints("\n");
312 printf(" %s ", find_sym); 756 found_file = 0;
313 else if (!be_quiet) 757 show_banner = 0;
314 fputs(" - ", stdout); 758 }
759
760 /* dump all the good stuff */
761 for (i = 0; out_format[i]; ++i) {
762 const char *out;
763 const char *tmp;
764
765 /* make sure we trim leading spaces in quiet mode */
766 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
767 *out_buffer = '\0';
768
769 if (!IS_MODIFIER(out_format[i])) {
770 xchrcat(&out_buffer, out_format[i], &out_len);
771 continue;
772 }
773
774 out = NULL;
775 be_wewy_wewy_quiet = (out_format[i] == '#');
776 switch (out_format[++i]) {
777 case '%':
778 case '#':
779 xchrcat(&out_buffer, out_format[i], &out_len); break;
780 case 'F':
781 found_file = 1;
782 if (be_wewy_wewy_quiet) break;
783 xstrcat(&out_buffer, filename, &out_len);
784 break;
785 case 'p':
786 found_file = 1;
787 if (be_wewy_wewy_quiet) break;
788 tmp = filename;
789 if (search_path) {
790 ssize_t len_search = strlen(search_path);
791 ssize_t len_file = strlen(filename);
792 if (!strncmp(filename, search_path, len_search) && \
793 len_file > len_search)
794 tmp += len_search;
795 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
315 } 796 }
797 xstrcat(&out_buffer, tmp, &out_len);
798 break;
799 case 'f':
800 found_file = 1;
801 if (be_wewy_wewy_quiet) break;
802 tmp = strrchr(filename, '/');
803 tmp = (tmp == NULL ? filename : tmp+1);
804 xstrcat(&out_buffer, tmp, &out_len);
805 break;
806 case 'o': out = get_elfetype(elf); break;
807 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
808 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
809 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
810 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
811 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
812 case 'n':
813 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
814 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
815 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
816 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
817 case 's': out = scanelf_file_sym(elf, &found_sym); break;
818 default: warnf("'%c' has no scan code?", out_format[i]);
316 } 819 }
820 if (out) xstrcat(&out_buffer, out, &out_len);
821 }
317 822
318 if (!be_quiet || found_pax || found_stack || found_textrel || \ 823#define FOUND_SOMETHING() \
319 found_rpath || found_needed || found_sym) 824 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
320 puts(filename); 825 found_rpath || found_needed || found_interp || found_bind || \
826 found_soname || found_sym || found_lib || found_textrels)
827
828 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
829 xchrcat(&out_buffer, ' ', &out_len);
830 xstrcat(&out_buffer, filename, &out_len);
831 }
832 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
833 puts(out_buffer);
834 fflush(stdout);
835 }
321 836
322 unreadelf(elf); 837 unreadelf(elf);
323} 838}
324 839
325/* scan a directory for ET_EXEC files and print when we find one */ 840/* scan a directory for ET_EXEC files and print when we find one */
330 struct stat st_top, st; 845 struct stat st_top, st;
331 char buf[_POSIX_PATH_MAX]; 846 char buf[_POSIX_PATH_MAX];
332 size_t pathlen = 0, len = 0; 847 size_t pathlen = 0, len = 0;
333 848
334 /* make sure path exists */ 849 /* make sure path exists */
335 if (lstat(path, &st_top) == -1) 850 if (lstat(path, &st_top) == -1) {
851 if (be_verbose > 2) printf("%s: does not exist\n", path);
336 return; 852 return;
853 }
337 854
338 /* ok, if it isn't a directory, assume we can open it */ 855 /* ok, if it isn't a directory, assume we can open it */
339 if (!S_ISDIR(st_top.st_mode)) { 856 if (!S_ISDIR(st_top.st_mode)) {
340 scanelf_file(path); 857 scanelf_file(path);
341 return; 858 return;
352 while ((dentry = readdir(dir))) { 869 while ((dentry = readdir(dir))) {
353 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 870 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
354 continue; 871 continue;
355 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 872 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
356 if (len >= sizeof(buf)) { 873 if (len >= sizeof(buf)) {
357 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf)); 874 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
875 (unsigned long)len, (unsigned long)sizeof(buf));
358 continue; 876 continue;
359 } 877 }
360 sprintf(buf, "%s/%s", path, dentry->d_name); 878 sprintf(buf, "%s/%s", path, dentry->d_name);
361 if (lstat(buf, &st) != -1) { 879 if (lstat(buf, &st) != -1) {
362 if (S_ISREG(st.st_mode)) 880 if (S_ISREG(st.st_mode))
368 } 886 }
369 } 887 }
370 closedir(dir); 888 closedir(dir);
371} 889}
372 890
891static int scanelf_from_file(char *filename)
892{
893 FILE *fp = NULL;
894 char *p;
895 char path[_POSIX_PATH_MAX];
896
897 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
898 fp = stdin;
899 else if ((fp = fopen(filename, "r")) == NULL)
900 return 1;
901
902 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
903 if ((p = strchr(path, '\n')) != NULL)
904 *p = 0;
905 search_path = path;
906 scanelf_dir(path);
907 }
908 if (fp != stdin)
909 fclose(fp);
910 return 0;
911}
912
913static void load_ld_so_conf()
914{
915 FILE *fp = NULL;
916 char *p;
917 char path[_POSIX_PATH_MAX];
918 int i = 0;
919
920 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
921 return;
922
923 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
924 if (*path != '/')
925 continue;
926
927 if ((p = strrchr(path, '\r')) != NULL)
928 *p = 0;
929 if ((p = strchr(path, '\n')) != NULL)
930 *p = 0;
931
932 ldpaths[i++] = xstrdup(path);
933
934 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
935 break;
936 }
937 ldpaths[i] = NULL;
938
939 fclose(fp);
940}
941
373/* scan /etc/ld.so.conf for paths */ 942/* scan /etc/ld.so.conf for paths */
374static void scanelf_ldpath() 943static void scanelf_ldpath()
375{ 944{
376 char scan_l, scan_ul, scan_ull; 945 char scan_l, scan_ul, scan_ull;
377 char *path, *p; 946 int i = 0;
378 FILE *fp;
379 947
380 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 948 if (!ldpaths[0])
381 err("Unable to open ld.so.conf: %s", strerror(errno)); 949 err("Unable to load any paths from ld.so.conf");
382 950
383 scan_l = scan_ul = scan_ull = 0; 951 scan_l = scan_ul = scan_ull = 0;
384 952
385 if ((path = malloc(_POSIX_PATH_MAX)) == NULL) { 953 while (ldpaths[i]) {
386 warn("Can not malloc() memory for ldpath scanning");
387 return;
388 }
389 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL)
390 if (*path == '/') {
391 if ((p = strrchr(path, '\r')) != NULL)
392 *p = 0;
393 if ((p = strrchr(path, '\n')) != NULL)
394 *p = 0;
395 if (!scan_l && !strcmp(path, "/lib")) scan_l = 1; 954 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
396 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1; 955 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
397 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1; 956 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
398 scanelf_dir(path); 957 scanelf_dir(ldpaths[i]);
958 ++i;
399 } 959 }
400 free(path);
401 fclose(fp);
402 960
403 if (!scan_l) scanelf_dir("/lib"); 961 if (!scan_l) scanelf_dir("/lib");
404 if (!scan_ul) scanelf_dir("/usr/lib"); 962 if (!scan_ul) scanelf_dir("/usr/lib");
405 if (!scan_ull) scanelf_dir("/usr/local/lib"); 963 if (!scan_ull) scanelf_dir("/usr/local/lib");
406} 964}
411 char *path, *p; 969 char *path, *p;
412 970
413 path = getenv("PATH"); 971 path = getenv("PATH");
414 if (!path) 972 if (!path)
415 err("PATH is not set in your env !"); 973 err("PATH is not set in your env !");
416 974 path = xstrdup(path);
417 if ((path = strdup(path)) == NULL)
418 err("strdup failed: %s", strerror(errno));
419 975
420 while ((p = strrchr(path, ':')) != NULL) { 976 while ((p = strrchr(path, ':')) != NULL) {
421 scanelf_dir(p + 1); 977 scanelf_dir(p + 1);
422 *p = 0; 978 *p = 0;
423 } 979 }
426} 982}
427 983
428 984
429 985
430/* usage / invocation handling functions */ 986/* usage / invocation handling functions */
431#define PARSE_FLAGS "plRmxetrns:aqvo:BhV" 987#define PARSE_FLAGS "plRmyxetrnibSs:N:TaqvF:f:o:BhV"
432#define a_argument required_argument 988#define a_argument required_argument
433static struct option const long_opts[] = { 989static struct option const long_opts[] = {
434 {"path", no_argument, NULL, 'p'}, 990 {"path", no_argument, NULL, 'p'},
435 {"ldpath", no_argument, NULL, 'l'}, 991 {"ldpath", no_argument, NULL, 'l'},
436 {"recursive", no_argument, NULL, 'R'}, 992 {"recursive", no_argument, NULL, 'R'},
437 {"mount", no_argument, NULL, 'm'}, 993 {"mount", no_argument, NULL, 'm'},
994 {"symlink", no_argument, NULL, 'y'},
438 {"pax", no_argument, NULL, 'x'}, 995 {"pax", no_argument, NULL, 'x'},
439 {"header", no_argument, NULL, 'e'}, 996 {"header", no_argument, NULL, 'e'},
440 {"textrel", no_argument, NULL, 't'}, 997 {"textrel", no_argument, NULL, 't'},
441 {"rpath", no_argument, NULL, 'r'}, 998 {"rpath", no_argument, NULL, 'r'},
442 {"needed", no_argument, NULL, 'n'}, 999 {"needed", no_argument, NULL, 'n'},
1000 {"interp", no_argument, NULL, 'i'},
1001 {"bind", no_argument, NULL, 'b'},
1002 {"soname", no_argument, NULL, 'S'},
443 {"symbol", a_argument, NULL, 's'}, 1003 {"symbol", a_argument, NULL, 's'},
1004 {"lib", a_argument, NULL, 'N'},
1005 {"textrels", no_argument, NULL, 'T'},
444 {"all", no_argument, NULL, 'a'}, 1006 {"all", no_argument, NULL, 'a'},
445 {"quiet", no_argument, NULL, 'q'}, 1007 {"quiet", no_argument, NULL, 'q'},
446 {"verbose", no_argument, NULL, 'v'}, 1008 {"verbose", no_argument, NULL, 'v'},
1009 {"format", a_argument, NULL, 'F'},
1010 {"from", a_argument, NULL, 'f'},
447 {"file", a_argument, NULL, 'o'}, 1011 {"file", a_argument, NULL, 'o'},
448 {"nobanner", no_argument, NULL, 'B'}, 1012 {"nobanner", no_argument, NULL, 'B'},
449 {"help", no_argument, NULL, 'h'}, 1013 {"help", no_argument, NULL, 'h'},
450 {"version", no_argument, NULL, 'V'}, 1014 {"version", no_argument, NULL, 'V'},
451 {NULL, no_argument, NULL, 0x0} 1015 {NULL, no_argument, NULL, 0x0}
452}; 1016};
1017
453static char *opts_help[] = { 1018static const char *opts_help[] = {
454 "Scan all directories in PATH environment", 1019 "Scan all directories in PATH environment",
455 "Scan all directories in /etc/ld.so.conf", 1020 "Scan all directories in /etc/ld.so.conf",
456 "Scan directories recursively", 1021 "Scan directories recursively",
457 "Don't recursively cross mount points\n", 1022 "Don't recursively cross mount points",
1023 "Don't scan symlinks\n",
458 "Print PaX markings", 1024 "Print PaX markings",
459 "Print GNU_STACK markings", 1025 "Print GNU_STACK/PT_LOAD markings",
460 "Print TEXTREL information", 1026 "Print TEXTREL information",
461 "Print RPATH information", 1027 "Print RPATH information",
462 "Print NEEDED information", 1028 "Print NEEDED information",
1029 "Print INTERP information",
1030 "Print BIND information",
1031 "Print SONAME information",
463 "Find a specified symbol", 1032 "Find a specified symbol",
1033 "Find a specified library",
1034 "Locate cause of TEXTREL",
464 "Print all scanned info (-x -e -t -r)\n", 1035 "Print all scanned info (-x -e -t -r -b)\n",
465 "Only output 'bad' things", 1036 "Only output 'bad' things",
466 "Be verbose (can be specified more than once)", 1037 "Be verbose (can be specified more than once)",
1038 "Use specified format for output",
1039 "Read input stream from a filename",
467 "Write output stream to a filename", 1040 "Write output stream to a filename",
468 "Don't display the header", 1041 "Don't display the header",
469 "Print this help and exit", 1042 "Print this help and exit",
470 "Print version and exit", 1043 "Print version and exit",
471 NULL 1044 NULL
472}; 1045};
473 1046
474/* display usage and exit */ 1047/* display usage and exit */
475static void usage(int status) 1048static void usage(int status)
476{ 1049{
477 int i; 1050 unsigned long i;
478 printf(" Scan ELF binaries for stuff\n" 1051 printf("* Scan ELF binaries for stuff\n\n"
479 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1052 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
480 printf("Options: -[%s]\n", PARSE_FLAGS); 1053 printf("Options: -[%s]\n", PARSE_FLAGS);
481 for (i = 0; long_opts[i].name; ++i) 1054 for (i = 0; long_opts[i].name; ++i)
482 if (long_opts[i].has_arg == no_argument) 1055 if (long_opts[i].has_arg == no_argument)
483 printf(" -%c, --%-13s %s\n", long_opts[i].val, 1056 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
484 long_opts[i].name, opts_help[i]); 1057 long_opts[i].name, opts_help[i]);
485 else 1058 else
486 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val, 1059 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
487 long_opts[i].name, opts_help[i]); 1060 long_opts[i].name, opts_help[i]);
1061
1062 if (status != EXIT_SUCCESS)
1063 exit(status);
1064
1065 puts("\nThe format modifiers for the -F option are:");
1066 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1067 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1068 puts(" i INTERP \tb BIND \ts symbol");
1069 puts(" N library \to Type \tT TEXTRELs");
1070 puts(" p filename (with search path removed)");
1071 puts(" f base filename");
1072 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1073
488 exit(status); 1074 exit(status);
489} 1075}
490 1076
491/* parse command line arguments and preform needed actions */ 1077/* parse command line arguments and preform needed actions */
492static void parseargs(int argc, char *argv[]) 1078static void parseargs(int argc, char *argv[])
493{ 1079{
494 int flag; 1080 int i;
1081 char *from_file = NULL;
495 1082
496 opterr = 0; 1083 opterr = 0;
497 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1084 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
498 switch (flag) { 1085 switch (i) {
499 1086
500 case 'V': /* version info */ 1087 case 'V':
501 printf("%s compiled %s\n%s\n" 1088 printf("pax-utils-%s: %s compiled %s\n%s\n"
502 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 1089 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
503 __FILE__, __DATE__, rcsid, argv0); 1090 VERSION, __FILE__, __DATE__, rcsid, argv0);
504 exit(EXIT_SUCCESS); 1091 exit(EXIT_SUCCESS);
505 break; 1092 break;
506 case 'h': usage(EXIT_SUCCESS); break; 1093 case 'h': usage(EXIT_SUCCESS); break;
507 1094 case 'f':
1095 if (from_file) err("Don't specify -f twice");
1096 from_file = xstrdup(optarg);
1097 break;
508 case 'o': { 1098 case 'o': {
509 FILE *fp = NULL; 1099 FILE *fp = NULL;
510 fp = freopen(optarg, "w", stdout); 1100 if ((fp = freopen(optarg, "w", stdout)) == NULL)
511 if (fp == NULL)
512 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1101 err("Could not open output stream '%s': %s", optarg, strerror(errno));
513 stdout = fp; 1102 SET_STDOUT(fp);
514 break; 1103 break;
515 } 1104 }
516 1105
517 case 's': find_sym = strdup(optarg); break; 1106 case 's': {
1107 size_t len;
1108 if (find_sym) err("Don't specify -s twice");
1109 find_sym = xstrdup(optarg);
1110 len = strlen(find_sym) + 1;
1111 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
1112 sprintf(versioned_symname, "%s@", find_sym);
1113 break;
1114 }
1115 case 'N': {
1116 if (find_lib) err("Don't specify -N twice");
1117 find_lib = xstrdup(optarg);
1118 break;
1119 }
518 1120
1121 case 'F': {
1122 if (out_format) err("Don't specify -F twice");
1123 out_format = xstrdup(optarg);
1124 break;
1125 }
1126
1127 case 'y': scan_symlink = 0; break;
519 case 'B': show_banner = 0; break; 1128 case 'B': show_banner = 0; break;
520 case 'l': scan_ldpath = 1; break; 1129 case 'l': scan_ldpath = 1; break;
521 case 'p': scan_envpath = 1; break; 1130 case 'p': scan_envpath = 1; break;
522 case 'R': dir_recurse = 1; break; 1131 case 'R': dir_recurse = 1; break;
523 case 'm': dir_crossmount = 0; break; 1132 case 'm': dir_crossmount = 0; break;
524 case 'x': show_pax = 1; break; 1133 case 'x': show_pax = 1; break;
525 case 'e': show_stack = 1; break; 1134 case 'e': show_phdr = 1; break;
526 case 't': show_textrel = 1; break; 1135 case 't': show_textrel = 1; break;
527 case 'r': show_rpath = 1; break; 1136 case 'r': show_rpath = 1; break;
528 case 'n': show_needed = 1; break; 1137 case 'n': show_needed = 1; break;
1138 case 'i': show_interp = 1; break;
1139 case 'b': show_bind = 1; break;
1140 case 'S': show_soname = 1; break;
1141 case 'T': show_textrels = 1; break;
529 case 'q': be_quiet = 1; break; 1142 case 'q': be_quiet = 1; break;
530 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1143 case 'v': be_verbose = (be_verbose % 20) + 1; break;
531 case 'a': show_pax = show_stack = show_textrel = show_needed = show_rpath = 1; break; 1144 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
532 1145
533 case ':': 1146 case ':':
534 warn("Option missing parameter"); 1147 err("Option missing parameter\n");
535 usage(EXIT_FAILURE);
536 break;
537 case '?': 1148 case '?':
538 warn("Unknown option"); 1149 err("Unknown option\n");
539 usage(EXIT_FAILURE);
540 break;
541 default: 1150 default:
542 err("Unhandled option '%c'", flag); 1151 err("Unhandled option '%c'", i);
543 break; 1152 }
1153 }
1154
1155 /* let the format option override all other options */
1156 if (out_format) {
1157 show_pax = show_phdr = show_textrel = show_rpath = \
1158 show_needed = show_interp = show_bind = show_soname = \
1159 show_textrels = 0;
1160 for (i = 0; out_format[i]; ++i) {
1161 if (!IS_MODIFIER(out_format[i])) continue;
1162
1163 switch (out_format[++i]) {
1164 case '%': break;
1165 case '#': break;
1166 case 'F': break;
1167 case 'p': break;
1168 case 'f': break;
1169 case 's': break;
1170 case 'N': break;
1171 case 'o': break;
1172 case 'x': show_pax = 1; break;
1173 case 'e': show_phdr = 1; break;
1174 case 't': show_textrel = 1; break;
1175 case 'r': show_rpath = 1; break;
1176 case 'n': show_needed = 1; break;
1177 case 'i': show_interp = 1; break;
1178 case 'b': show_bind = 1; break;
1179 case 'S': show_soname = 1; break;
1180 case 'T': show_textrels = 1; break;
1181 default:
1182 err("Invalid format specifier '%c' (byte %i)",
1183 out_format[i], i+1);
544 } 1184 }
545 } 1185 }
546 1186
547 if (be_quiet && be_verbose) 1187 /* construct our default format */
548 err("You can be quiet or you can be verbose, not both, stupid"); 1188 } else {
1189 size_t fmt_len = 30;
1190 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1191 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1192 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1193 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1194 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1195 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1196 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1197 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1198 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1199 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1200 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1201 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1202 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1203 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1204 }
1205 if (be_verbose > 2) printf("Format: %s\n", out_format);
549 1206
1207 /* now lets actually do the scanning */
1208 if (scan_ldpath || (show_rpath && be_quiet))
1209 load_ld_so_conf();
550 if (scan_ldpath) scanelf_ldpath(); 1210 if (scan_ldpath) scanelf_ldpath();
551 if (scan_envpath) scanelf_envpath(); 1211 if (scan_envpath) scanelf_envpath();
1212 if (from_file) {
1213 scanelf_from_file(from_file);
1214 free(from_file);
1215 from_file = *argv;
1216 }
552 if (optind == argc && !scan_ldpath && !scan_envpath) 1217 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
553 err("Nothing to scan !?"); 1218 err("Nothing to scan !?");
554 while (optind < argc) 1219 while (optind < argc) {
555 scanelf_dir(argv[optind++]); 1220 search_path = argv[optind++];
1221 scanelf_dir(search_path);
1222 }
556 1223
1224 /* clean up */
1225 if (find_sym) {
1226 free(find_sym);
1227 free(versioned_symname);
1228 }
557 if (find_sym) free(find_sym); 1229 if (find_lib) free(find_lib);
1230 if (out_format) free(out_format);
1231 for (i = 0; ldpaths[i]; ++i)
1232 free(ldpaths[i]);
1233}
1234
1235
1236
1237/* utility funcs */
1238static char *xstrdup(const char *s)
1239{
1240 char *ret = strdup(s);
1241 if (!ret) err("Could not strdup(): %s", strerror(errno));
1242 return ret;
1243}
1244
1245static void *xmalloc(size_t size)
1246{
1247 void *ret = malloc(size);
1248 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1249 return ret;
1250}
1251
1252static void xstrcat(char **dst, const char *src, size_t *curr_len)
1253{
1254 size_t new_len;
1255
1256 new_len = strlen(*dst) + strlen(src);
1257 if (*curr_len <= new_len) {
1258 *curr_len = new_len + (*curr_len / 2);
1259 *dst = realloc(*dst, *curr_len);
1260 if (!*dst)
1261 err("could not realloc %li bytes", (unsigned long)*curr_len);
1262 }
1263
1264 strcat(*dst, src);
1265}
1266
1267static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1268{
1269 static char my_app[2];
1270 my_app[0] = append;
1271 my_app[1] = '\0';
1272 xstrcat(dst, my_app, curr_len);
558} 1273}
559 1274
560 1275
561 1276
562int main(int argc, char *argv[]) 1277int main(int argc, char *argv[])
563{ 1278{
564 if (argc < 2) 1279 if (argc < 2)
565 usage(EXIT_FAILURE); 1280 usage(EXIT_FAILURE);
566 parseargs(argc, argv); 1281 parseargs(argc, argv);
567 fclose(stdout); 1282 fclose(stdout);
1283#ifdef __BOUNDS_CHECKING_ON
1284 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1285#endif
568 return EXIT_SUCCESS; 1286 return EXIT_SUCCESS;
569} 1287}

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