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Revision 1.103 - (hide annotations) (download) (as text)
Wed Jan 11 23:46:21 2006 UTC (8 years, 6 months ago) by vapier
Branch: MAIN
Changes since 1.102: +7 -2 lines
File MIME type: text/x-csrc
zero out the whole dyn rpath section rather than just changing the tag

1 solar 1.1 /*
2 vapier 1.98 * Copyright 2003-2006 Gentoo Foundation
3 solar 1.1 * Distributed under the terms of the GNU General Public License v2
4 vapier 1.103 * $Header: /var/cvsroot/gentoo-projects/pax-utils/scanelf.c,v 1.102 2006/01/11 01:12:12 vapier Exp $
5 solar 1.1 *
6 vapier 1.98 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org>
7     * Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org>
8 solar 1.1 */
9    
10 vapier 1.89 #include "paxinc.h"
11 solar 1.1
12 vapier 1.103 static const char *rcsid = "$Id: scanelf.c,v 1.102 2006/01/11 01:12:12 vapier Exp $";
13 vapier 1.36 #define argv0 "scanelf"
14 vapier 1.10
15 vapier 1.70 #define IS_MODIFIER(c) (c == '%' || c == '#')
16    
17 vapier 1.10
18    
19     /* prototypes */
20     static void scanelf_file(const char *filename);
21     static void scanelf_dir(const char *path);
22     static void scanelf_ldpath();
23     static void scanelf_envpath();
24     static void usage(int status);
25     static void parseargs(int argc, char *argv[]);
26 vapier 1.60 static char *xstrdup(const char *s);
27 vapier 1.41 static void *xmalloc(size_t size);
28 vapier 1.95 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
29     #define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
30 vapier 1.41 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
31 vapier 1.10
32     /* variables to control behavior */
33 vapier 1.48 static char *ldpaths[256];
34 vapier 1.10 static char scan_ldpath = 0;
35     static char scan_envpath = 0;
36 vapier 1.37 static char scan_symlink = 1;
37 vapier 1.10 static char dir_recurse = 0;
38 vapier 1.14 static char dir_crossmount = 1;
39 vapier 1.10 static char show_pax = 0;
40 solar 1.73 static char show_phdr = 0;
41 vapier 1.10 static char show_textrel = 0;
42     static char show_rpath = 0;
43 vapier 1.32 static char show_needed = 0;
44 vapier 1.38 static char show_interp = 0;
45 vapier 1.49 static char show_bind = 0;
46 vapier 1.84 static char show_soname = 0;
47 vapier 1.76 static char show_textrels = 0;
48 solar 1.16 static char show_banner = 1;
49 vapier 1.10 static char be_quiet = 0;
50 vapier 1.14 static char be_verbose = 0;
51 vapier 1.70 static char be_wewy_wewy_quiet = 0;
52 vapier 1.39 static char *find_sym = NULL, *versioned_symname = NULL;
53 vapier 1.72 static char *find_lib = NULL;
54 vapier 1.39 static char *out_format = NULL;
55 vapier 1.66 static char *search_path = NULL;
56 vapier 1.101 static char fix_elf = 0;
57 solar 1.86 static char gmatch = 0;
58 vapier 1.102 static char use_ldcache = 0;
59 solar 1.1
60 vapier 1.70
61 solar 1.96 caddr_t ldcache = 0;
62     size_t ldcache_size = 0;
63    
64 vapier 1.39 /* sub-funcs for scanelf_file() */
65 vapier 1.77 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
66     {
67     /* find the best SHT_DYNSYM and SHT_STRTAB sections */
68     #define GET_SYMTABS(B) \
69     if (elf->elf_class == ELFCLASS ## B) { \
70     Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
71     /* debug sections */ \
72     symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
73     strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
74     /* runtime sections */ \
75     dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
76     dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
77     if (symtab && dynsym) { \
78     *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
79     } else { \
80     *sym = (void*)(symtab ? symtab : dynsym); \
81     } \
82     if (strtab && dynstr) { \
83     *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
84     } else { \
85     *tab = (void*)(strtab ? strtab : dynstr); \
86     } \
87     }
88     GET_SYMTABS(32)
89     GET_SYMTABS(64)
90     }
91 vapier 1.41 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
92 solar 1.6 {
93 solar 1.61 static char ret[7];
94     unsigned long i, shown;
95    
96 vapier 1.41 if (!show_pax) return NULL;
97 vapier 1.10
98 solar 1.61 shown = 0;
99     memset(&ret, 0, sizeof(ret));
100    
101     if (elf->phdr) {
102     #define SHOW_PAX(B) \
103     if (elf->elf_class == ELFCLASS ## B) { \
104     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
105     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
106     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
107     if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
108     continue; \
109     if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \
110     continue; \
111     memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
112     *found_pax = 1; \
113     ++shown; \
114     break; \
115     } \
116     }
117     SHOW_PAX(32)
118     SHOW_PAX(64)
119     }
120    
121     /* fall back to EI_PAX if no PT_PAX was found */
122     if (!*ret) {
123 vapier 1.90 static char *paxflags;
124 solar 1.61 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
125     if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
126     *found_pax = 1;
127 vapier 1.90 return (be_wewy_wewy_quiet ? NULL : paxflags);
128 solar 1.61 }
129     strncpy(ret, paxflags, sizeof(ret));
130 vapier 1.14 }
131 vapier 1.41
132 vapier 1.90 if (be_wewy_wewy_quiet || (be_quiet && !shown))
133 solar 1.61 return NULL;
134 vapier 1.90 else
135     return ret;
136     }
137 solar 1.61
138 solar 1.73 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
139 vapier 1.39 {
140 vapier 1.71 static char ret[12];
141 vapier 1.41 char *found;
142 vapier 1.99 unsigned long i, shown, multi_stack, multi_relro, multi_load;
143     int max_pt_load;
144 vapier 1.41
145 solar 1.73 if (!show_phdr) return NULL;
146 vapier 1.41
147 vapier 1.71 memcpy(ret, "--- --- ---\0", 12);
148    
149 vapier 1.41 shown = 0;
150 vapier 1.71 multi_stack = multi_relro = multi_load = 0;
151 vapier 1.99 max_pt_load = elf_max_pt_load(elf);
152 vapier 1.44
153 solar 1.73 #define SHOW_PHDR(B) \
154 vapier 1.39 if (elf->elf_class == ELFCLASS ## B) { \
155     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
156 vapier 1.91 Elf ## B ## _Off offset; \
157     uint32_t flags, check_flags; \
158     if (elf->phdr != NULL) { \
159     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
160     for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
161     if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
162     if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
163     found = found_phdr; \
164     offset = 0; \
165     check_flags = PF_X; \
166     } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
167     if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
168     found = found_relro; \
169     offset = 4; \
170     check_flags = PF_X; \
171     } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
172 vapier 1.99 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
173 vapier 1.91 found = found_load; \
174     offset = 8; \
175     check_flags = PF_W|PF_X; \
176     } else \
177     continue; \
178     flags = EGET(phdr[i].p_flags); \
179     if (be_quiet && ((flags & check_flags) != check_flags)) \
180     continue; \
181 vapier 1.101 if (fix_elf && ((flags & PF_X) != flags)) { \
182     ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
183     ret[3] = ret[7] = '!'; \
184     flags = EGET(phdr[i].p_flags); \
185     } \
186 vapier 1.91 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
187     *found = 1; \
188     ++shown; \
189     } \
190     } else if (elf->shdr != NULL) { \
191     /* no program headers which means this is prob an object file */ \
192     Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
193     Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
194     check_flags = SHF_WRITE|SHF_EXECINSTR; \
195     for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
196     if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
197     offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
198     if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \
199     if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
200     flags = EGET(shdr[i].sh_flags); \
201     if (be_quiet && ((flags & check_flags) != check_flags)) \
202     continue; \
203     ++*found_phdr; \
204     shown = 1; \
205     if (flags & SHF_WRITE) ret[0] = 'W'; \
206     if (flags & SHF_ALLOC) ret[1] = 'A'; \
207     if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
208     if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
209     break; \
210     } \
211     } \
212     if (!multi_stack) { \
213     *found_phdr = 1; \
214     shown = 1; \
215     memcpy(ret, "!WX", 3); \
216     } \
217 vapier 1.39 } \
218     }
219 solar 1.73 SHOW_PHDR(32)
220     SHOW_PHDR(64)
221 vapier 1.44
222 vapier 1.90 if (be_wewy_wewy_quiet || (be_quiet && !shown))
223 vapier 1.41 return NULL;
224     else
225     return ret;
226 vapier 1.39 }
227 vapier 1.90 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
228 vapier 1.39 {
229 vapier 1.90 static const char *ret = "TEXTREL";
230 vapier 1.44 unsigned long i;
231 vapier 1.41
232 vapier 1.79 if (!show_textrel && !show_textrels) return NULL;
233 vapier 1.41
234 vapier 1.44 if (elf->phdr) {
235 vapier 1.39 #define SHOW_TEXTREL(B) \
236     if (elf->elf_class == ELFCLASS ## B) { \
237     Elf ## B ## _Dyn *dyn; \
238     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
239     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
240 vapier 1.44 Elf ## B ## _Off offset; \
241 vapier 1.39 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
242 vapier 1.59 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
243 vapier 1.44 offset = EGET(phdr[i].p_offset); \
244     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
245     dyn = DYN ## B (elf->data + offset); \
246 vapier 1.39 while (EGET(dyn->d_tag) != DT_NULL) { \
247     if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
248     *found_textrel = 1; \
249     /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
250 vapier 1.70 return (be_wewy_wewy_quiet ? NULL : ret); \
251 vapier 1.39 } \
252     ++dyn; \
253 vapier 1.26 } \
254 vapier 1.39 } }
255     SHOW_TEXTREL(32)
256     SHOW_TEXTREL(64)
257 vapier 1.44 }
258    
259 vapier 1.70 if (be_quiet || be_wewy_wewy_quiet)
260 vapier 1.41 return NULL;
261     else
262 vapier 1.90 return " - ";
263 vapier 1.39 }
264 vapier 1.79 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
265 vapier 1.76 {
266 vapier 1.82 unsigned long s, r, rmax;
267     void *symtab_void, *strtab_void, *text_void;
268 vapier 1.76
269     if (!show_textrels) return NULL;
270    
271 vapier 1.79 /* don't search for TEXTREL's if the ELF doesn't have any */
272     if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
273     if (!*found_textrel) return NULL;
274    
275 vapier 1.77 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
276 vapier 1.82 text_void = elf_findsecbyname(elf, ".text");
277 vapier 1.76
278 vapier 1.82 if (symtab_void && strtab_void && text_void && elf->shdr) {
279 vapier 1.76 #define SHOW_TEXTRELS(B) \
280     if (elf->elf_class == ELFCLASS ## B) { \
281     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
282     Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
283     Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
284     Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
285 vapier 1.82 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
286     Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
287     uint ## B ## _t memsz = EGET(text->sh_size); \
288 vapier 1.76 Elf ## B ## _Rel *rel; \
289     Elf ## B ## _Rela *rela; \
290     /* search the section headers for relocations */ \
291     for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
292     uint32_t sh_type = EGET(shdr[s].sh_type); \
293     if (sh_type == SHT_REL) { \
294     rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
295     rela = NULL; \
296     rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
297     } else if (sh_type == SHT_RELA) { \
298     rel = NULL; \
299     rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
300     rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
301     } else \
302     continue; \
303 vapier 1.82 /* now see if any of the relocs are in the .text */ \
304     for (r = 0; r < rmax; ++r) { \
305     unsigned long sym_max; \
306     Elf ## B ## _Addr offset_tmp; \
307     Elf ## B ## _Sym *func; \
308     Elf ## B ## _Sym *sym; \
309     Elf ## B ## _Addr r_offset; \
310     uint ## B ## _t r_info; \
311     if (sh_type == SHT_REL) { \
312     r_offset = EGET(rel[r].r_offset); \
313     r_info = EGET(rel[r].r_info); \
314     } else { \
315     r_offset = EGET(rela[r].r_offset); \
316     r_info = EGET(rela[r].r_info); \
317     } \
318     /* make sure this relocation is inside of the .text */ \
319     if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
320     if (be_verbose <= 2) continue; \
321     } else \
322 vapier 1.78 *found_textrels = 1; \
323 vapier 1.82 /* locate this relocation symbol name */ \
324     sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
325     sym_max = ELF ## B ## _R_SYM(r_info); \
326     if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
327     sym += sym_max; \
328     else \
329     sym = NULL; \
330     sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
331     /* show the raw details about this reloc */ \
332 vapier 1.88 printf(" %s: ", elf->base_filename); \
333 vapier 1.82 if (sym && sym->st_name) \
334     printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
335     else \
336 vapier 1.88 printf("(memory/fake?)"); \
337 vapier 1.82 printf(" [0x%lX]", (unsigned long)r_offset); \
338     /* now try to find the closest symbol that this rel is probably in */ \
339     sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
340     func = NULL; \
341     offset_tmp = 0; \
342     while (sym_max--) { \
343     if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
344     func = sym; \
345     offset_tmp = EGET(sym->st_value); \
346 vapier 1.76 } \
347 vapier 1.82 ++sym; \
348 vapier 1.76 } \
349 vapier 1.82 printf(" in "); \
350     if (func && func->st_name) \
351     printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
352     else \
353     printf("(NULL: fake?)"); \
354     printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
355 vapier 1.76 } \
356     } }
357     SHOW_TEXTRELS(32)
358     SHOW_TEXTRELS(64)
359     }
360 vapier 1.82 if (!*found_textrels)
361     warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
362 vapier 1.76
363     return NULL;
364     }
365 solar 1.83
366 vapier 1.102 static void rpath_security_checks(elfobj *, char *, const char *);
367     static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
368 vapier 1.100 {
369 solar 1.83 struct stat st;
370 vapier 1.84 switch (*item) {
371 vapier 1.89 case '/': break;
372     case '.':
373 vapier 1.102 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
374 vapier 1.89 break;
375 vapier 1.100 case ':':
376 vapier 1.89 case '\0':
377 vapier 1.102 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
378 solar 1.83 break;
379     case '$':
380 vapier 1.84 if (fstat(elf->fd, &st) != -1)
381 solar 1.83 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
382 vapier 1.102 warnf("Security problem with %s='%s' in %s with mode set of %o",
383     dt_type, item, elf->filename, st.st_mode & 07777);
384 solar 1.83 break;
385     default:
386 vapier 1.102 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
387 solar 1.83 break;
388     }
389     }
390 vapier 1.41 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
391 vapier 1.39 {
392 vapier 1.48 unsigned long i, s;
393     char *rpath, *runpath, **r;
394 vapier 1.39 void *strtbl_void;
395 vapier 1.10
396 vapier 1.39 if (!show_rpath) return;
397 vapier 1.10
398 vapier 1.39 strtbl_void = elf_findsecbyname(elf, ".dynstr");
399     rpath = runpath = NULL;
400 vapier 1.10
401 vapier 1.44 if (elf->phdr && strtbl_void) {
402 vapier 1.26 #define SHOW_RPATH(B) \
403     if (elf->elf_class == ELFCLASS ## B) { \
404     Elf ## B ## _Dyn *dyn; \
405     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
406     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
407     Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
408 vapier 1.44 Elf ## B ## _Off offset; \
409 vapier 1.60 Elf ## B ## _Xword word; \
410 vapier 1.48 /* Scan all the program headers */ \
411 vapier 1.26 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
412 vapier 1.48 /* Just scan dynamic headers */ \
413 vapier 1.26 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
414 vapier 1.44 offset = EGET(phdr[i].p_offset); \
415     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
416 vapier 1.48 /* Just scan dynamic RPATH/RUNPATH headers */ \
417 vapier 1.44 dyn = DYN ## B (elf->data + offset); \
418 vapier 1.48 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
419     if (word == DT_RPATH) { \
420     r = &rpath; \
421     } else if (word == DT_RUNPATH) { \
422     r = &runpath; \
423     } else { \
424     ++dyn; \
425     continue; \
426     } \
427     /* Verify the memory is somewhat sane */ \
428     offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
429 vapier 1.69 if (offset < (Elf ## B ## _Off)elf->len) { \
430 vapier 1.48 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
431     *r = (char*)(elf->data + offset); \
432 vapier 1.103 /* cache the length in case we need to nuke this section later on */ \
433     if (fix_elf) \
434     offset = strlen(*r); \
435 vapier 1.48 /* If quiet, don't output paths in ld.so.conf */ \
436 vapier 1.69 if (be_quiet) { \
437     size_t len; \
438     char *start, *end; \
439 vapier 1.75 /* note that we only 'chop' off leading known paths. */ \
440     /* since *r is read-only memory, we can only move the ptr forward. */ \
441     start = *r; \
442     /* scan each path in : delimited list */ \
443     while (start) { \
444 vapier 1.102 rpath_security_checks(elf, start, get_elfdtype(word)); \
445 vapier 1.69 end = strchr(start, ':'); \
446 vapier 1.75 len = (end ? abs(end - start) : strlen(start)); \
447 vapier 1.102 if (use_ldcache) \
448     for (s = 0; ldpaths[s]; ++s) \
449     if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
450     *r = end; \
451     /* corner case ... if RPATH reads "/usr/lib:", we want \
452     * to show ':' rather than '' */ \
453     if (end && end[1] != '\0') \
454     (*r)++; \
455     break; \
456     } \
457 vapier 1.100 if (!*r || !end) \
458     break; \
459 vapier 1.75 else \
460     start = start + len + 1; \
461 vapier 1.69 } \
462     } \
463 vapier 1.101 if (*r) { \
464 vapier 1.102 if (fix_elf > 2 || **r == '\0') { \
465 vapier 1.101 /* just nuke it */ \
466     nuke_it##B: \
467 vapier 1.103 memset(*r, 0x00, offset); \
468 vapier 1.102 *r = NULL; \
469 vapier 1.101 ESET(dyn->d_tag, DT_DEBUG); \
470 vapier 1.103 ESET(dyn->d_un.d_ptr, 0); \
471 vapier 1.101 } else if (fix_elf) { \
472     /* try to clean "bad" paths */ \
473     size_t len, tmpdir_len; \
474     char *start, *end; \
475     const char *tmpdir; \
476     start = *r; \
477     tmpdir = (getenv("TMPDIR") ? : "."); \
478     tmpdir_len = strlen(tmpdir); \
479     while (1) { \
480     end = strchr(start, ':'); \
481     if (start == end) { \
482     eat_this_path##B: \
483     len = strlen(end); \
484     memmove(start, end+1, len); \
485     start[len-1] = '\0'; \
486     end = start - 1; \
487     } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
488     if (!end) { \
489     if (start == *r) \
490     goto nuke_it##B; \
491     *--start = '\0'; \
492     } else \
493     goto eat_this_path##B; \
494     } \
495     if (!end) \
496     break; \
497     start = end + 1; \
498     } \
499 vapier 1.102 if (**r == '\0') \
500     goto nuke_it##B; \
501 vapier 1.101 } \
502 vapier 1.102 if (*r) \
503     *found_rpath = 1; \
504 vapier 1.101 } \
505 vapier 1.26 } \
506     ++dyn; \
507     } \
508     } }
509     SHOW_RPATH(32)
510     SHOW_RPATH(64)
511 vapier 1.10 }
512 vapier 1.41
513 vapier 1.70 if (be_wewy_wewy_quiet) return;
514    
515 vapier 1.39 if (rpath && runpath) {
516 vapier 1.41 if (!strcmp(rpath, runpath)) {
517     xstrcat(ret, runpath, ret_len);
518     } else {
519 vapier 1.39 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
520 vapier 1.41 xchrcat(ret, '{', ret_len);
521     xstrcat(ret, rpath, ret_len);
522     xchrcat(ret, ',', ret_len);
523     xstrcat(ret, runpath, ret_len);
524     xchrcat(ret, '}', ret_len);
525 vapier 1.39 }
526     } else if (rpath || runpath)
527 vapier 1.41 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
528     else if (!be_quiet)
529     xstrcat(ret, " - ", ret_len);
530 vapier 1.39 }
531 solar 1.96
532     #define LDSO_CACHE_MAGIC "ld.so-"
533     #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
534     #define LDSO_CACHE_VER "1.7.0"
535     #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
536 vapier 1.97 #define FLAG_ANY -1
537     #define FLAG_TYPE_MASK 0x00ff
538     #define FLAG_LIBC4 0x0000
539     #define FLAG_ELF 0x0001
540     #define FLAG_ELF_LIBC5 0x0002
541     #define FLAG_ELF_LIBC6 0x0003
542     #define FLAG_REQUIRED_MASK 0xff00
543     #define FLAG_SPARC_LIB64 0x0100
544     #define FLAG_IA64_LIB64 0x0200
545     #define FLAG_X8664_LIB64 0x0300
546     #define FLAG_S390_LIB64 0x0400
547     #define FLAG_POWERPC_LIB64 0x0500
548     #define FLAG_MIPS64_LIBN32 0x0600
549     #define FLAG_MIPS64_LIBN64 0x0700
550 solar 1.96
551 vapier 1.97 static char *lookup_cache_lib(elfobj *, char *);
552     static char *lookup_cache_lib(elfobj *elf, char *fname)
553 solar 1.96 {
554     int fd = 0;
555     char *strs;
556     static char buf[_POSIX_PATH_MAX] = "";
557     const char *cachefile = "/etc/ld.so.cache";
558     struct stat st;
559    
560     typedef struct {
561     char magic[LDSO_CACHE_MAGIC_LEN];
562     char version[LDSO_CACHE_VER_LEN];
563     int nlibs;
564     } header_t;
565 vapier 1.97 header_t *header;
566 solar 1.96
567     typedef struct {
568     int flags;
569     int sooffset;
570     int liboffset;
571     } libentry_t;
572     libentry_t *libent;
573    
574     if (fname == NULL)
575     return NULL;
576    
577     if (ldcache == 0) {
578 vapier 1.97 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
579 solar 1.96 return NULL;
580 vapier 1.97
581     /* cache these values so we only map/unmap the cache file once */
582 solar 1.96 ldcache_size = st.st_size;
583 vapier 1.97 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
584    
585     close(fd);
586 solar 1.96
587 vapier 1.97 if (ldcache == (caddr_t)-1)
588 solar 1.96 return NULL;
589    
590     if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
591     return NULL;
592     if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
593     return NULL;
594     }
595    
596     header = (header_t *) ldcache;
597     libent = (libentry_t *) (ldcache + sizeof(header_t));
598     strs = (char *) &libent[header->nlibs];
599    
600     for (fd = 0; fd < header->nlibs; fd++) {
601 vapier 1.97 /* this should be more fine grained, but for now we assume that
602     * diff arches will not be cached together. and we ignore the
603     * the different multilib mips cases. */
604     if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
605     continue;
606     if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
607     continue;
608    
609 solar 1.96 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
610     continue;
611     strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
612     }
613     return buf;
614     }
615    
616    
617 vapier 1.84 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
618 vapier 1.39 {
619 vapier 1.44 unsigned long i;
620 vapier 1.39 char *needed;
621     void *strtbl_void;
622 solar 1.96 char *p;
623 vapier 1.39
624 vapier 1.72 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
625 vapier 1.10
626 vapier 1.39 strtbl_void = elf_findsecbyname(elf, ".dynstr");
627 vapier 1.32
628 vapier 1.44 if (elf->phdr && strtbl_void) {
629 vapier 1.32 #define SHOW_NEEDED(B) \
630     if (elf->elf_class == ELFCLASS ## B) { \
631     Elf ## B ## _Dyn *dyn; \
632     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
633     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
634     Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
635 vapier 1.44 Elf ## B ## _Off offset; \
636 vapier 1.32 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
637     if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
638 vapier 1.44 offset = EGET(phdr[i].p_offset); \
639     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
640     dyn = DYN ## B (elf->data + offset); \
641 vapier 1.32 while (EGET(dyn->d_tag) != DT_NULL) { \
642     if (EGET(dyn->d_tag) == DT_NEEDED) { \
643 vapier 1.44 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
644 vapier 1.69 if (offset >= (Elf ## B ## _Off)elf->len) { \
645 vapier 1.49 ++dyn; \
646     continue; \
647     } \
648 vapier 1.44 needed = (char*)(elf->data + offset); \
649 vapier 1.72 if (op == 0) { \
650     if (!be_wewy_wewy_quiet) { \
651     if (*found_needed) xchrcat(ret, ',', ret_len); \
652 vapier 1.102 if (use_ldcache) \
653 vapier 1.97 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
654 solar 1.96 needed = p; \
655 vapier 1.72 xstrcat(ret, needed, ret_len); \
656     } \
657     *found_needed = 1; \
658     } else { \
659 solar 1.86 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
660 vapier 1.81 *found_lib = 1; \
661 solar 1.86 return (be_wewy_wewy_quiet ? NULL : needed); \
662 vapier 1.81 } \
663 vapier 1.72 } \
664 vapier 1.32 } \
665     ++dyn; \
666     } \
667     } }
668     SHOW_NEEDED(32)
669     SHOW_NEEDED(64)
670 vapier 1.85 if (op == 0 && !*found_needed && be_verbose)
671 vapier 1.84 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
672 vapier 1.32 }
673 vapier 1.72
674     return NULL;
675 vapier 1.39 }
676 vapier 1.41 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
677 vapier 1.39 {
678     void *strtbl_void;
679    
680 vapier 1.41 if (!show_interp) return NULL;
681 vapier 1.32
682 vapier 1.39 strtbl_void = elf_findsecbyname(elf, ".interp");
683 vapier 1.38
684 vapier 1.39 if (strtbl_void) {
685 vapier 1.38 #define SHOW_INTERP(B) \
686     if (elf->elf_class == ELFCLASS ## B) { \
687 solar 1.40 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
688     *found_interp = 1; \
689 vapier 1.70 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
690 vapier 1.38 }
691     SHOW_INTERP(32)
692     SHOW_INTERP(64)
693     }
694 vapier 1.41 return NULL;
695 vapier 1.39 }
696 vapier 1.49 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
697     {
698     unsigned long i;
699     struct stat s;
700    
701     if (!show_bind) return NULL;
702 vapier 1.51 if (!elf->phdr) return NULL;
703 vapier 1.49
704     #define SHOW_BIND(B) \
705     if (elf->elf_class == ELFCLASS ## B) { \
706     Elf ## B ## _Dyn *dyn; \
707     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
708     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
709     Elf ## B ## _Off offset; \
710     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
711     if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
712     offset = EGET(phdr[i].p_offset); \
713     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
714     dyn = DYN ## B (elf->data + offset); \
715     while (EGET(dyn->d_tag) != DT_NULL) { \
716     if (EGET(dyn->d_tag) == DT_BIND_NOW || \
717     (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
718     { \
719     if (be_quiet) return NULL; \
720     *found_bind = 1; \
721 vapier 1.70 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
722 vapier 1.49 } \
723     ++dyn; \
724     } \
725     } \
726     }
727     SHOW_BIND(32)
728     SHOW_BIND(64)
729    
730 vapier 1.70 if (be_wewy_wewy_quiet) return NULL;
731    
732 vapier 1.56 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
733 vapier 1.49 return NULL;
734     } else {
735     *found_bind = 1;
736 solar 1.68 return (char *) "LAZY";
737 vapier 1.49 }
738     }
739 vapier 1.84 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
740     {
741     unsigned long i;
742     char *soname;
743     void *strtbl_void;
744    
745     if (!show_soname) return NULL;
746    
747     strtbl_void = elf_findsecbyname(elf, ".dynstr");
748    
749     if (elf->phdr && strtbl_void) {
750     #define SHOW_SONAME(B) \
751     if (elf->elf_class == ELFCLASS ## B) { \
752     Elf ## B ## _Dyn *dyn; \
753     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
754     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
755     Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
756     Elf ## B ## _Off offset; \
757     /* only look for soname in shared objects */ \
758     if (ehdr->e_type != ET_DYN) \
759     return NULL; \
760     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
761     if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
762     offset = EGET(phdr[i].p_offset); \
763     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
764     dyn = DYN ## B (elf->data + offset); \
765     while (EGET(dyn->d_tag) != DT_NULL) { \
766     if (EGET(dyn->d_tag) == DT_SONAME) { \
767     offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
768     if (offset >= (Elf ## B ## _Off)elf->len) { \
769     ++dyn; \
770     continue; \
771     } \
772     soname = (char*)(elf->data + offset); \
773     *found_soname = 1; \
774     return (be_wewy_wewy_quiet ? NULL : soname); \
775     } \
776     ++dyn; \
777     } \
778     } }
779     SHOW_SONAME(32)
780     SHOW_SONAME(64)
781     }
782    
783     return NULL;
784     }
785 vapier 1.72 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
786 vapier 1.39 {
787 vapier 1.44 unsigned long i;
788 vapier 1.95 char *ret;
789 vapier 1.39 void *symtab_void, *strtab_void;
790 vapier 1.38
791 vapier 1.41 if (!find_sym) return NULL;
792 vapier 1.95 ret = find_sym;
793 vapier 1.32
794 vapier 1.77 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
795 vapier 1.27
796 vapier 1.39 if (symtab_void && strtab_void) {
797 vapier 1.27 #define FIND_SYM(B) \
798     if (elf->elf_class == ELFCLASS ## B) { \
799     Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
800     Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
801     Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
802 vapier 1.44 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
803 vapier 1.27 char *symname; \
804     for (i = 0; i < cnt; ++i) { \
805     if (sym->st_name) { \
806     symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
807 solar 1.28 if (*find_sym == '*') { \
808 vapier 1.32 printf("%s(%s) %5lX %15s %s\n", \
809 vapier 1.39 ((*found_sym == 0) ? "\n\t" : "\t"), \
810 vapier 1.76 elf->base_filename, \
811 vapier 1.94 (unsigned long)sym->st_size, \
812 vapier 1.95 get_elfstttype(sym->st_info), \
813 vapier 1.32 symname); \
814 vapier 1.39 *found_sym = 1; \
815 vapier 1.95 } else { \
816     char *this_sym, *next_sym; \
817     this_sym = find_sym; \
818     do { \
819     next_sym = strchr(this_sym, ','); \
820     if (next_sym == NULL) \
821     next_sym = this_sym + strlen(this_sym); \
822     if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
823     (strcmp(symname, versioned_symname) == 0)) { \
824     ret = this_sym; \
825     (*found_sym)++; \
826     goto break_out; \
827     } \
828     this_sym = next_sym + 1; \
829     } while (*next_sym != '\0'); \
830     } \
831 vapier 1.27 } \
832     ++sym; \
833     } }
834     FIND_SYM(32)
835     FIND_SYM(64)
836 vapier 1.39 }
837 vapier 1.70
838 vapier 1.95 break_out:
839 vapier 1.70 if (be_wewy_wewy_quiet) return NULL;
840    
841 vapier 1.41 if (*find_sym != '*' && *found_sym)
842 vapier 1.95 return ret;
843 vapier 1.41 if (be_quiet)
844     return NULL;
845     else
846 solar 1.68 return (char *)" - ";
847 vapier 1.39 }
848     /* scan an elf file and show all the fun stuff */
849 solar 1.57 #define prints(str) write(fileno(stdout), str, strlen(str))
850 vapier 1.39 static void scanelf_file(const char *filename)
851     {
852 vapier 1.44 unsigned long i;
853 solar 1.73 char found_pax, found_phdr, found_relro, found_load, found_textrel,
854 vapier 1.84 found_rpath, found_needed, found_interp, found_bind, found_soname,
855 vapier 1.76 found_sym, found_lib, found_file, found_textrels;
856 vapier 1.39 elfobj *elf;
857     struct stat st;
858 vapier 1.41 static char *out_buffer = NULL;
859     static size_t out_len;
860 vapier 1.39
861     /* make sure 'filename' exists */
862     if (lstat(filename, &st) == -1) {
863     if (be_verbose > 2) printf("%s: does not exist\n", filename);
864     return;
865     }
866     /* always handle regular files and handle symlinked files if no -y */
867 vapier 1.55 if (S_ISLNK(st.st_mode)) {
868     if (!scan_symlink) return;
869     stat(filename, &st);
870     }
871     if (!S_ISREG(st.st_mode)) {
872 vapier 1.39 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
873     return;
874     }
875    
876 vapier 1.76 found_pax = found_phdr = found_relro = found_load = found_textrel = \
877 vapier 1.84 found_rpath = found_needed = found_interp = found_bind = found_soname = \
878 vapier 1.76 found_sym = found_lib = found_file = found_textrels = 0;
879 vapier 1.39
880     /* verify this is real ELF */
881 vapier 1.101 if ((elf = _readelf(filename, !fix_elf)) == NULL) {
882 vapier 1.39 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
883     return;
884     }
885    
886     if (be_verbose > 1)
887 vapier 1.41 printf("%s: scanning file {%s,%s}\n", filename,
888 vapier 1.69 get_elfeitype(EI_CLASS, elf->elf_class),
889     get_elfeitype(EI_DATA, elf->data[EI_DATA]));
890 vapier 1.39 else if (be_verbose)
891     printf("%s: scanning file\n", filename);
892    
893 vapier 1.41 /* init output buffer */
894     if (!out_buffer) {
895     out_len = sizeof(char) * 80;
896     out_buffer = (char*)xmalloc(out_len);
897     }
898     *out_buffer = '\0';
899    
900 vapier 1.39 /* show the header */
901     if (!be_quiet && show_banner) {
902 vapier 1.49 for (i = 0; out_format[i]; ++i) {
903 vapier 1.70 if (!IS_MODIFIER(out_format[i])) continue;
904 vapier 1.41
905     switch (out_format[++i]) {
906     case '%': break;
907 vapier 1.70 case '#': break;
908 vapier 1.66 case 'F':
909     case 'p':
910     case 'f': prints("FILE "); found_file = 1; break;
911 vapier 1.41 case 'o': prints(" TYPE "); break;
912     case 'x': prints(" PAX "); break;
913 vapier 1.71 case 'e': prints("STK/REL/PTL "); break;
914 vapier 1.41 case 't': prints("TEXTREL "); break;
915     case 'r': prints("RPATH "); break;
916     case 'n': prints("NEEDED "); break;
917     case 'i': prints("INTERP "); break;
918 vapier 1.49 case 'b': prints("BIND "); break;
919 vapier 1.84 case 'S': prints("SONAME "); break;
920 vapier 1.41 case 's': prints("SYM "); break;
921 vapier 1.72 case 'N': prints("LIB "); break;
922 vapier 1.76 case 'T': prints("TEXTRELS "); break;
923     default: warnf("'%c' has no title ?", out_format[i]);
924 vapier 1.39 }
925 vapier 1.27 }
926 vapier 1.49 if (!found_file) prints("FILE ");
927 vapier 1.41 prints("\n");
928 vapier 1.49 found_file = 0;
929 vapier 1.39 show_banner = 0;
930     }
931    
932     /* dump all the good stuff */
933 vapier 1.49 for (i = 0; out_format[i]; ++i) {
934 vapier 1.41 const char *out;
935 vapier 1.66 const char *tmp;
936 vapier 1.41
937     /* make sure we trim leading spaces in quiet mode */
938     if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
939     *out_buffer = '\0';
940 vapier 1.39
941 vapier 1.70 if (!IS_MODIFIER(out_format[i])) {
942 vapier 1.41 xchrcat(&out_buffer, out_format[i], &out_len);
943     continue;
944     }
945 vapier 1.39
946 vapier 1.41 out = NULL;
947 vapier 1.70 be_wewy_wewy_quiet = (out_format[i] == '#');
948 vapier 1.41 switch (out_format[++i]) {
949 vapier 1.70 case '%':
950     case '#':
951     xchrcat(&out_buffer, out_format[i], &out_len); break;
952     case 'F':
953 vapier 1.76 found_file = 1;
954 vapier 1.70 if (be_wewy_wewy_quiet) break;
955     xstrcat(&out_buffer, filename, &out_len);
956     break;
957 vapier 1.66 case 'p':
958 vapier 1.76 found_file = 1;
959 vapier 1.70 if (be_wewy_wewy_quiet) break;
960 vapier 1.66 tmp = filename;
961     if (search_path) {
962     ssize_t len_search = strlen(search_path);
963     ssize_t len_file = strlen(filename);
964     if (!strncmp(filename, search_path, len_search) && \
965     len_file > len_search)
966     tmp += len_search;
967     if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
968     }
969     xstrcat(&out_buffer, tmp, &out_len);
970     break;
971     case 'f':
972 vapier 1.76 found_file = 1;
973 vapier 1.70 if (be_wewy_wewy_quiet) break;
974 vapier 1.66 tmp = strrchr(filename, '/');
975     tmp = (tmp == NULL ? filename : tmp+1);
976     xstrcat(&out_buffer, tmp, &out_len);
977     break;
978 vapier 1.41 case 'o': out = get_elfetype(elf); break;
979     case 'x': out = scanelf_file_pax(elf, &found_pax); break;
980 solar 1.73 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
981 vapier 1.41 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
982 vapier 1.79 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
983 vapier 1.41 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
984 vapier 1.72 case 'n':
985     case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
986 vapier 1.41 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
987 vapier 1.49 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
988 vapier 1.84 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
989 vapier 1.72 case 's': out = scanelf_file_sym(elf, &found_sym); break;
990 vapier 1.76 default: warnf("'%c' has no scan code?", out_format[i]);
991 vapier 1.29 }
992 vapier 1.95 if (out) {
993     /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
994     if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
995     xstrncat(&out_buffer, out, &out_len, (tmp-out));
996     else
997     xstrcat(&out_buffer, out, &out_len);
998     }
999 vapier 1.39 }
1000    
1001 vapier 1.54 #define FOUND_SOMETHING() \
1002 solar 1.73 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1003 vapier 1.76 found_rpath || found_needed || found_interp || found_bind || \
1004 vapier 1.84 found_soname || found_sym || found_lib || found_textrels)
1005 vapier 1.54
1006     if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1007     xchrcat(&out_buffer, ' ', &out_len);
1008     xstrcat(&out_buffer, filename, &out_len);
1009 vapier 1.27 }
1010 vapier 1.79 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1011 vapier 1.41 puts(out_buffer);
1012 vapier 1.79 fflush(stdout);
1013     }
1014 vapier 1.10
1015     unreadelf(elf);
1016 solar 1.6 }
1017    
1018 solar 1.1 /* scan a directory for ET_EXEC files and print when we find one */
1019 vapier 1.10 static void scanelf_dir(const char *path)
1020 solar 1.1 {
1021 vapier 1.10 register DIR *dir;
1022     register struct dirent *dentry;
1023 vapier 1.14 struct stat st_top, st;
1024 solar 1.21 char buf[_POSIX_PATH_MAX];
1025 vapier 1.32 size_t pathlen = 0, len = 0;
1026 vapier 1.10
1027     /* make sure path exists */
1028 vapier 1.39 if (lstat(path, &st_top) == -1) {
1029     if (be_verbose > 2) printf("%s: does not exist\n", path);
1030 vapier 1.10 return;
1031 vapier 1.39 }
1032 solar 1.11
1033 vapier 1.10 /* ok, if it isn't a directory, assume we can open it */
1034 vapier 1.14 if (!S_ISDIR(st_top.st_mode)) {
1035 vapier 1.10 scanelf_file(path);
1036     return;
1037     }
1038    
1039     /* now scan the dir looking for fun stuff */
1040     if ((dir = opendir(path)) == NULL) {
1041     warnf("could not opendir %s: %s", path, strerror(errno));
1042     return;
1043     }
1044 vapier 1.15 if (be_verbose) printf("%s: scanning dir\n", path);
1045 solar 1.11
1046 vapier 1.32 pathlen = strlen(path);
1047 vapier 1.10 while ((dentry = readdir(dir))) {
1048     if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1049     continue;
1050 vapier 1.32 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1051     if (len >= sizeof(buf)) {
1052 vapier 1.76 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1053     (unsigned long)len, (unsigned long)sizeof(buf));
1054 vapier 1.32 continue;
1055     }
1056 solar 1.31 sprintf(buf, "%s/%s", path, dentry->d_name);
1057 solar 1.20 if (lstat(buf, &st) != -1) {
1058 vapier 1.10 if (S_ISREG(st.st_mode))
1059 solar 1.20 scanelf_file(buf);
1060 vapier 1.10 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1061 vapier 1.14 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1062 solar 1.20 scanelf_dir(buf);
1063 vapier 1.10 }
1064     }
1065     }
1066     closedir(dir);
1067 solar 1.1 }
1068    
1069 vapier 1.47 static int scanelf_from_file(char *filename)
1070     {
1071 solar 1.45 FILE *fp = NULL;
1072     char *p;
1073     char path[_POSIX_PATH_MAX];
1074    
1075     if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
1076     fp = stdin;
1077     else if ((fp = fopen(filename, "r")) == NULL)
1078     return 1;
1079    
1080     while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
1081     if ((p = strchr(path, '\n')) != NULL)
1082     *p = 0;
1083 vapier 1.66 search_path = path;
1084 solar 1.45 scanelf_dir(path);
1085     }
1086     if (fp != stdin)
1087     fclose(fp);
1088     return 0;
1089     }
1090    
1091 vapier 1.48 static void load_ld_so_conf()
1092     {
1093     FILE *fp = NULL;
1094     char *p;
1095     char path[_POSIX_PATH_MAX];
1096     int i = 0;
1097    
1098     if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
1099     return;
1100    
1101     while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
1102     if (*path != '/')
1103     continue;
1104    
1105     if ((p = strrchr(path, '\r')) != NULL)
1106     *p = 0;
1107     if ((p = strchr(path, '\n')) != NULL)
1108     *p = 0;
1109    
1110     ldpaths[i++] = xstrdup(path);
1111    
1112     if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1113     break;
1114     }
1115     ldpaths[i] = NULL;
1116    
1117     fclose(fp);
1118     }
1119    
1120 vapier 1.10 /* scan /etc/ld.so.conf for paths */
1121     static void scanelf_ldpath()
1122     {
1123 vapier 1.17 char scan_l, scan_ul, scan_ull;
1124 vapier 1.48 int i = 0;
1125 vapier 1.10
1126 vapier 1.48 if (!ldpaths[0])
1127     err("Unable to load any paths from ld.so.conf");
1128 vapier 1.10
1129 vapier 1.17 scan_l = scan_ul = scan_ull = 0;
1130    
1131 vapier 1.48 while (ldpaths[i]) {
1132     if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1133     if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1134     if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1135     scanelf_dir(ldpaths[i]);
1136     ++i;
1137     }
1138 vapier 1.10
1139 vapier 1.17 if (!scan_l) scanelf_dir("/lib");
1140     if (!scan_ul) scanelf_dir("/usr/lib");
1141     if (!scan_ull) scanelf_dir("/usr/local/lib");
1142 vapier 1.10 }
1143 solar 1.1
1144 vapier 1.10 /* scan env PATH for paths */
1145     static void scanelf_envpath()
1146 solar 1.1 {
1147 solar 1.34 char *path, *p;
1148 vapier 1.10
1149     path = getenv("PATH");
1150     if (!path)
1151     err("PATH is not set in your env !");
1152 vapier 1.41 path = xstrdup(path);
1153 vapier 1.10
1154     while ((p = strrchr(path, ':')) != NULL) {
1155     scanelf_dir(p + 1);
1156     *p = 0;
1157     }
1158 vapier 1.17
1159 solar 1.34 free(path);
1160 solar 1.1 }
1161    
1162    
1163 vapier 1.10 /* usage / invocation handling functions */
1164 vapier 1.101 #define PARSE_FLAGS "plRmyXxetrnLibSs:gN:TaqvF:f:o:BhV"
1165 vapier 1.27 #define a_argument required_argument
1166 vapier 1.10 static struct option const long_opts[] = {
1167     {"path", no_argument, NULL, 'p'},
1168     {"ldpath", no_argument, NULL, 'l'},
1169     {"recursive", no_argument, NULL, 'R'},
1170 vapier 1.14 {"mount", no_argument, NULL, 'm'},
1171 vapier 1.37 {"symlink", no_argument, NULL, 'y'},
1172 vapier 1.101 {"fix", no_argument, NULL, 'X'},
1173 vapier 1.10 {"pax", no_argument, NULL, 'x'},
1174 solar 1.16 {"header", no_argument, NULL, 'e'},
1175 vapier 1.10 {"textrel", no_argument, NULL, 't'},
1176     {"rpath", no_argument, NULL, 'r'},
1177 vapier 1.32 {"needed", no_argument, NULL, 'n'},
1178 solar 1.96 {"ldcache", no_argument, NULL, 'L'},
1179 vapier 1.38 {"interp", no_argument, NULL, 'i'},
1180 vapier 1.49 {"bind", no_argument, NULL, 'b'},
1181 vapier 1.84 {"soname", no_argument, NULL, 'S'},
1182 vapier 1.76 {"symbol", a_argument, NULL, 's'},
1183     {"lib", a_argument, NULL, 'N'},
1184 solar 1.86 {"gmatch", no_argument, NULL, 'g'},
1185 vapier 1.76 {"textrels", no_argument, NULL, 'T'},
1186 vapier 1.10 {"all", no_argument, NULL, 'a'},
1187     {"quiet", no_argument, NULL, 'q'},
1188 vapier 1.14 {"verbose", no_argument, NULL, 'v'},
1189 vapier 1.76 {"format", a_argument, NULL, 'F'},
1190     {"from", a_argument, NULL, 'f'},
1191     {"file", a_argument, NULL, 'o'},
1192 solar 1.16 {"nobanner", no_argument, NULL, 'B'},
1193 vapier 1.10 {"help", no_argument, NULL, 'h'},
1194     {"version", no_argument, NULL, 'V'},
1195     {NULL, no_argument, NULL, 0x0}
1196     };
1197 solar 1.57
1198 solar 1.68 static const char *opts_help[] = {
1199 vapier 1.10 "Scan all directories in PATH environment",
1200     "Scan all directories in /etc/ld.so.conf",
1201 vapier 1.14 "Scan directories recursively",
1202 vapier 1.37 "Don't recursively cross mount points",
1203 vapier 1.101 "Don't scan symlinks",
1204     "Try and 'fix' bad things (use with -r/-e)\n",
1205 vapier 1.10 "Print PaX markings",
1206 vapier 1.71 "Print GNU_STACK/PT_LOAD markings",
1207 vapier 1.10 "Print TEXTREL information",
1208     "Print RPATH information",
1209 vapier 1.32 "Print NEEDED information",
1210 vapier 1.102 "Utilize ld.so.cache information (use with -r/-n)",
1211 vapier 1.38 "Print INTERP information",
1212 vapier 1.49 "Print BIND information",
1213 vapier 1.84 "Print SONAME information",
1214 vapier 1.27 "Find a specified symbol",
1215 vapier 1.72 "Find a specified library",
1216 solar 1.86 "Use strncmp to match libraries. (use with -N)",
1217 vapier 1.76 "Locate cause of TEXTREL",
1218 vapier 1.82 "Print all scanned info (-x -e -t -r -b)\n",
1219 vapier 1.14 "Only output 'bad' things",
1220     "Be verbose (can be specified more than once)",
1221 vapier 1.39 "Use specified format for output",
1222 solar 1.45 "Read input stream from a filename",
1223 vapier 1.24 "Write output stream to a filename",
1224 vapier 1.14 "Don't display the header",
1225 vapier 1.10 "Print this help and exit",
1226     "Print version and exit",
1227     NULL
1228     };
1229    
1230     /* display usage and exit */
1231     static void usage(int status)
1232 solar 1.1 {
1233 vapier 1.44 unsigned long i;
1234 solar 1.52 printf("* Scan ELF binaries for stuff\n\n"
1235 solar 1.35 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
1236     printf("Options: -[%s]\n", PARSE_FLAGS);
1237 vapier 1.10 for (i = 0; long_opts[i].name; ++i)
1238 vapier 1.27 if (long_opts[i].has_arg == no_argument)
1239 solar 1.52 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
1240 vapier 1.27 long_opts[i].name, opts_help[i]);
1241     else
1242 solar 1.52 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
1243 vapier 1.27 long_opts[i].name, opts_help[i]);
1244 solar 1.45
1245     if (status != EXIT_SUCCESS)
1246     exit(status);
1247    
1248 vapier 1.46 puts("\nThe format modifiers for the -F option are:");
1249 vapier 1.70 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1250     puts(" t TEXTREL \tr RPATH \tn NEEDED");
1251     puts(" i INTERP \tb BIND \ts symbol");
1252 vapier 1.76 puts(" N library \to Type \tT TEXTRELs");
1253 vapier 1.88 puts(" S SONAME");
1254 vapier 1.70 puts(" p filename (with search path removed)");
1255 vapier 1.88 puts(" f filename (short name/basename)");
1256 vapier 1.70 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1257 solar 1.45
1258 vapier 1.10 exit(status);
1259 solar 1.1 }
1260    
1261     /* parse command line arguments and preform needed actions */
1262 vapier 1.10 static void parseargs(int argc, char *argv[])
1263     {
1264 vapier 1.48 int i;
1265 solar 1.45 char *from_file = NULL;
1266 vapier 1.10
1267     opterr = 0;
1268 vapier 1.48 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1269     switch (i) {
1270 vapier 1.10
1271 vapier 1.39 case 'V':
1272 vapier 1.80 printf("pax-utils-%s: %s compiled %s\n%s\n"
1273     "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1274     VERSION, __FILE__, __DATE__, rcsid, argv0);
1275 vapier 1.10 exit(EXIT_SUCCESS);
1276     break;
1277     case 'h': usage(EXIT_SUCCESS); break;
1278 solar 1.45 case 'f':
1279 vapier 1.100 if (from_file) warn("You prob don't want to specify -f twice");
1280     from_file = optarg;
1281 solar 1.45 break;
1282 vapier 1.24 case 'o': {
1283 solar 1.21 FILE *fp = NULL;
1284 solar 1.64 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1285 vapier 1.24 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1286 vapier 1.65 SET_STDOUT(fp);
1287 solar 1.21 break;
1288     }
1289 vapier 1.24
1290 vapier 1.39 case 's': {
1291 vapier 1.93 if (find_sym) warn("You prob don't want to specify -s twice");
1292     find_sym = optarg;
1293     versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1294 vapier 1.39 sprintf(versioned_symname, "%s@", find_sym);
1295     break;
1296     }
1297 vapier 1.72 case 'N': {
1298 vapier 1.93 if (find_lib) warn("You prob don't want to specify -N twice");
1299     find_lib = optarg;
1300 vapier 1.72 break;
1301     }
1302 vapier 1.39
1303     case 'F': {
1304 vapier 1.93 if (out_format) warn("You prob don't want to specify -F twice");
1305     out_format = optarg;
1306 vapier 1.39 break;
1307     }
1308 vapier 1.27
1309 solar 1.96 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */
1310 vapier 1.102 case 'L': use_ldcache = 1; break;
1311 vapier 1.37 case 'y': scan_symlink = 0; break;
1312 solar 1.16 case 'B': show_banner = 0; break;
1313 vapier 1.10 case 'l': scan_ldpath = 1; break;
1314     case 'p': scan_envpath = 1; break;
1315     case 'R': dir_recurse = 1; break;
1316 vapier 1.14 case 'm': dir_crossmount = 0; break;
1317 vapier 1.101 case 'X': ++fix_elf; break;
1318 vapier 1.10 case 'x': show_pax = 1; break;
1319 solar 1.73 case 'e': show_phdr = 1; break;
1320 vapier 1.10 case 't': show_textrel = 1; break;
1321     case 'r': show_rpath = 1; break;
1322 vapier 1.32 case 'n': show_needed = 1; break;
1323 vapier 1.38 case 'i': show_interp = 1; break;
1324 vapier 1.49 case 'b': show_bind = 1; break;
1325 vapier 1.84 case 'S': show_soname = 1; break;
1326 vapier 1.76 case 'T': show_textrels = 1; break;
1327 vapier 1.10 case 'q': be_quiet = 1; break;
1328 vapier 1.14 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1329 vapier 1.82 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1330 vapier 1.10
1331     case ':':
1332 vapier 1.49 err("Option missing parameter\n");
1333 vapier 1.10 case '?':
1334 vapier 1.49 err("Unknown option\n");
1335 vapier 1.10 default:
1336 vapier 1.48 err("Unhandled option '%c'", i);
1337 vapier 1.10 }
1338     }
1339    
1340 vapier 1.39 /* let the format option override all other options */
1341     if (out_format) {
1342 solar 1.73 show_pax = show_phdr = show_textrel = show_rpath = \
1343 vapier 1.84 show_needed = show_interp = show_bind = show_soname = \
1344     show_textrels = 0;
1345 vapier 1.48 for (i = 0; out_format[i]; ++i) {
1346 vapier 1.70 if (!IS_MODIFIER(out_format[i])) continue;
1347 vapier 1.39
1348 vapier 1.48 switch (out_format[++i]) {
1349 vapier 1.39 case '%': break;
1350 vapier 1.70 case '#': break;
1351 vapier 1.39 case 'F': break;
1352 vapier 1.66 case 'p': break;
1353     case 'f': break;
1354 vapier 1.39 case 's': break;
1355 vapier 1.72 case 'N': break;
1356 vapier 1.41 case 'o': break;
1357 vapier 1.39 case 'x': show_pax = 1; break;
1358 solar 1.73 case 'e': show_phdr = 1; break;
1359 vapier 1.39 case 't': show_textrel = 1; break;
1360     case 'r': show_rpath = 1; break;
1361     case 'n': show_needed = 1; break;
1362     case 'i': show_interp = 1; break;
1363 vapier 1.49 case 'b': show_bind = 1; break;
1364 vapier 1.84 case 'S': show_soname = 1; break;
1365 vapier 1.76 case 'T': show_textrels = 1; break;
1366 vapier 1.39 default:
1367     err("Invalid format specifier '%c' (byte %i)",
1368 vapier 1.48 out_format[i], i+1);
1369 vapier 1.39 }
1370     }
1371 vapier 1.41
1372     /* construct our default format */
1373     } else {
1374     size_t fmt_len = 30;
1375     out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1376 vapier 1.76 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1377     if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1378     if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1379     if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1380     if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1381     if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1382     if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1383     if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1384 vapier 1.84 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1385 vapier 1.76 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1386     if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1387     if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1388     if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1389 vapier 1.39 }
1390 vapier 1.41 if (be_verbose > 2) printf("Format: %s\n", out_format);
1391 vapier 1.39
1392     /* now lets actually do the scanning */
1393 vapier 1.102 if (scan_ldpath || use_ldcache)
1394 vapier 1.48 load_ld_so_conf();
1395 vapier 1.10 if (scan_ldpath) scanelf_ldpath();
1396     if (scan_envpath) scanelf_envpath();
1397 solar 1.45 if (from_file) {
1398     scanelf_from_file(from_file);
1399     from_file = *argv;
1400     }
1401     if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1402 vapier 1.25 err("Nothing to scan !?");
1403 vapier 1.66 while (optind < argc) {
1404     search_path = argv[optind++];
1405     scanelf_dir(search_path);
1406     }
1407 vapier 1.27
1408 vapier 1.39 /* clean up */
1409 vapier 1.93 if (versioned_symname) free(versioned_symname);
1410 vapier 1.48 for (i = 0; ldpaths[i]; ++i)
1411     free(ldpaths[i]);
1412 solar 1.96
1413     if (ldcache != 0)
1414     munmap(ldcache, ldcache_size);
1415 vapier 1.10 }
1416    
1417    
1418    
1419 vapier 1.41 /* utility funcs */
1420 vapier 1.60 static char *xstrdup(const char *s)
1421 vapier 1.41 {
1422     char *ret = strdup(s);
1423     if (!ret) err("Could not strdup(): %s", strerror(errno));
1424     return ret;
1425     }
1426     static void *xmalloc(size_t size)
1427     {
1428     void *ret = malloc(size);
1429     if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1430     return ret;
1431     }
1432 vapier 1.95 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1433 vapier 1.41 {
1434 vapier 1.69 size_t new_len;
1435 vapier 1.41
1436     new_len = strlen(*dst) + strlen(src);
1437     if (*curr_len <= new_len) {
1438     *curr_len = new_len + (*curr_len / 2);
1439     *dst = realloc(*dst, *curr_len);
1440     if (!*dst)
1441 vapier 1.95 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1442 vapier 1.41 }
1443    
1444 vapier 1.95 if (n)
1445     strncat(*dst, src, n);
1446     else
1447     strcat(*dst, src);
1448 vapier 1.41 }
1449     static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1450     {
1451     static char my_app[2];
1452     my_app[0] = append;
1453     my_app[1] = '\0';
1454     xstrcat(dst, my_app, curr_len);
1455     }
1456    
1457    
1458 vapier 1.72
1459 vapier 1.10 int main(int argc, char *argv[])
1460 solar 1.1 {
1461 vapier 1.10 if (argc < 2)
1462     usage(EXIT_FAILURE);
1463     parseargs(argc, argv);
1464 solar 1.21 fclose(stdout);
1465 solar 1.61 #ifdef __BOUNDS_CHECKING_ON
1466 vapier 1.66 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1467 solar 1.61 #endif
1468 vapier 1.10 return EXIT_SUCCESS;
1469 solar 1.1 }

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