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Revision 1.135 - (hide annotations) (download) (as text)
Thu Mar 16 17:00:21 2006 UTC (8 years, 7 months ago) by solar
Branch: MAIN
Changes since 1.134: +2 -3 lines
File MIME type: text/x-csrc
- invert logic for glob64

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 solar 1.135 * $Header: /var/cvsroot/gentoo-projects/pax-utils/scanelf.c,v 1.134 2006/03/15 03:20:29 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 solar 1.135 static const char *rcsid = "$Id: scanelf.c,v 1.134 2006/03/15 03:20:29 vapier Exp $";
13 vapier 1.36 #define argv0 "scanelf"
14 vapier 1.10
15 solar 1.132 #define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
16 vapier 1.70
17 solar 1.132 #define do_state(option, flag) \
18     if (islower(option)) { \
19     flags &= ~PF_##flag; \
20     flags |= PF_NO##flag; \
21     } else { \
22     flags &= ~PF_NO##flag; \
23     flags |= PF_##flag; \
24     }
25    
26 vapier 1.10
27     /* prototypes */
28 vapier 1.106 static int scanelf_elfobj(elfobj *elf);
29     static int scanelf_elf(const char *filename, int fd, size_t len);
30     static int scanelf_archive(const char *filename, int fd, size_t len);
31 vapier 1.10 static void scanelf_file(const char *filename);
32     static void scanelf_dir(const char *path);
33 vapier 1.106 static void scanelf_ldpath(void);
34     static void scanelf_envpath(void);
35 vapier 1.10 static void usage(int status);
36     static void parseargs(int argc, char *argv[]);
37 vapier 1.60 static char *xstrdup(const char *s);
38 vapier 1.41 static void *xmalloc(size_t size);
39 vapier 1.95 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
40     #define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
41 vapier 1.41 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
42 vapier 1.10
43     /* variables to control behavior */
44 solar 1.119 static char match_etypes[126] = "";
45 vapier 1.48 static char *ldpaths[256];
46 vapier 1.10 static char scan_ldpath = 0;
47     static char scan_envpath = 0;
48 vapier 1.37 static char scan_symlink = 1;
49 vapier 1.105 static char scan_archives = 0;
50 vapier 1.10 static char dir_recurse = 0;
51 vapier 1.14 static char dir_crossmount = 1;
52 vapier 1.10 static char show_pax = 0;
53 solar 1.73 static char show_phdr = 0;
54 vapier 1.10 static char show_textrel = 0;
55     static char show_rpath = 0;
56 vapier 1.32 static char show_needed = 0;
57 vapier 1.38 static char show_interp = 0;
58 vapier 1.49 static char show_bind = 0;
59 vapier 1.84 static char show_soname = 0;
60 vapier 1.76 static char show_textrels = 0;
61 solar 1.16 static char show_banner = 1;
62 vapier 1.10 static char be_quiet = 0;
63 vapier 1.14 static char be_verbose = 0;
64 solar 1.127 static char be_wewy_wewy_quiet = 0;
65 solar 1.132 static char be_semi_verbose = 0;
66 vapier 1.39 static char *find_sym = NULL, *versioned_symname = NULL;
67 vapier 1.72 static char *find_lib = NULL;
68 solar 1.124 static char *find_section = NULL;
69 vapier 1.39 static char *out_format = NULL;
70 vapier 1.66 static char *search_path = NULL;
71 vapier 1.101 static char fix_elf = 0;
72 solar 1.86 static char gmatch = 0;
73 vapier 1.102 static char use_ldcache = 0;
74 solar 1.1
75 solar 1.120 int match_bits = 0;
76 solar 1.96 caddr_t ldcache = 0;
77     size_t ldcache_size = 0;
78 solar 1.127 unsigned long setpax = 0UL;
79 solar 1.96
80 vapier 1.39 /* sub-funcs for scanelf_file() */
81 vapier 1.77 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
82     {
83     /* find the best SHT_DYNSYM and SHT_STRTAB sections */
84     #define GET_SYMTABS(B) \
85     if (elf->elf_class == ELFCLASS ## B) { \
86     Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
87     /* debug sections */ \
88     symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
89     strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
90     /* runtime sections */ \
91     dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
92     dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
93     if (symtab && dynsym) { \
94     *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
95     } else { \
96     *sym = (void*)(symtab ? symtab : dynsym); \
97     } \
98     if (strtab && dynstr) { \
99     *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
100     } else { \
101     *tab = (void*)(strtab ? strtab : dynstr); \
102     } \
103     }
104     GET_SYMTABS(32)
105     GET_SYMTABS(64)
106     }
107 solar 1.127
108 vapier 1.41 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
109 solar 1.6 {
110 solar 1.61 static char ret[7];
111     unsigned long i, shown;
112    
113 vapier 1.41 if (!show_pax) return NULL;
114 vapier 1.10
115 solar 1.61 shown = 0;
116     memset(&ret, 0, sizeof(ret));
117    
118     if (elf->phdr) {
119     #define SHOW_PAX(B) \
120     if (elf->elf_class == ELFCLASS ## B) { \
121     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
122     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
123     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
124     if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
125     continue; \
126 solar 1.127 if (fix_elf && setpax) { \
127     /* set the paxctl flags */ \
128     ESET(phdr[i].p_flags, setpax); \
129     } \
130 solar 1.129 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
131 solar 1.61 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 solar 1.128
143     if (fix_elf && setpax) {
144     /* set the chpax settings */
145 solar 1.129 if (elf->elf_class == ELFCLASS32) {
146     if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
147     ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
148     } else {
149     if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
150     ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
151     }
152 solar 1.128 }
153    
154 solar 1.61 /* fall back to EI_PAX if no PT_PAX was found */
155     if (!*ret) {
156 vapier 1.90 static char *paxflags;
157 solar 1.61 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
158     if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
159     *found_pax = 1;
160 solar 1.127 return (be_wewy_wewy_quiet ? NULL : paxflags);
161 solar 1.61 }
162     strncpy(ret, paxflags, sizeof(ret));
163 vapier 1.14 }
164 vapier 1.41
165 solar 1.127 if (be_wewy_wewy_quiet || (be_quiet && !shown))
166 solar 1.61 return NULL;
167 vapier 1.90 else
168     return ret;
169     }
170 solar 1.61
171 solar 1.73 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
172 vapier 1.39 {
173 vapier 1.71 static char ret[12];
174 vapier 1.41 char *found;
175 vapier 1.99 unsigned long i, shown, multi_stack, multi_relro, multi_load;
176     int max_pt_load;
177 vapier 1.41
178 solar 1.73 if (!show_phdr) return NULL;
179 vapier 1.41
180 vapier 1.71 memcpy(ret, "--- --- ---\0", 12);
181    
182 vapier 1.41 shown = 0;
183 vapier 1.71 multi_stack = multi_relro = multi_load = 0;
184 vapier 1.99 max_pt_load = elf_max_pt_load(elf);
185 vapier 1.44
186 vapier 1.108 #define NOTE_GNU_STACK ".note.GNU-stack"
187 solar 1.73 #define SHOW_PHDR(B) \
188 vapier 1.39 if (elf->elf_class == ELFCLASS ## B) { \
189     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
190 vapier 1.91 Elf ## B ## _Off offset; \
191     uint32_t flags, check_flags; \
192     if (elf->phdr != NULL) { \
193     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
194     for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
195     if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
196     if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
197     found = found_phdr; \
198     offset = 0; \
199     check_flags = PF_X; \
200     } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
201     if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
202     found = found_relro; \
203     offset = 4; \
204     check_flags = PF_X; \
205     } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
206 solar 1.117 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
207     if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
208 vapier 1.91 found = found_load; \
209     offset = 8; \
210     check_flags = PF_W|PF_X; \
211     } else \
212     continue; \
213     flags = EGET(phdr[i].p_flags); \
214     if (be_quiet && ((flags & check_flags) != check_flags)) \
215     continue; \
216 solar 1.130 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
217 vapier 1.101 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
218     ret[3] = ret[7] = '!'; \
219     flags = EGET(phdr[i].p_flags); \
220     } \
221 vapier 1.91 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
222     *found = 1; \
223     ++shown; \
224     } \
225     } else if (elf->shdr != NULL) { \
226     /* no program headers which means this is prob an object file */ \
227     Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
228     Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
229 vapier 1.108 char *str; \
230 vapier 1.118 if ((void*)strtbl > (void*)elf->data_end) \
231 vapier 1.108 goto skip_this_shdr##B; \
232 vapier 1.91 check_flags = SHF_WRITE|SHF_EXECINSTR; \
233     for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
234     if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
235     offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
236 vapier 1.108 str = elf->data + offset; \
237     if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
238     if (!strcmp(str, NOTE_GNU_STACK)) { \
239 vapier 1.91 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
240     flags = EGET(shdr[i].sh_flags); \
241     if (be_quiet && ((flags & check_flags) != check_flags)) \
242     continue; \
243     ++*found_phdr; \
244     shown = 1; \
245     if (flags & SHF_WRITE) ret[0] = 'W'; \
246     if (flags & SHF_ALLOC) ret[1] = 'A'; \
247     if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
248     if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
249     break; \
250     } \
251     } \
252 vapier 1.108 skip_this_shdr##B: \
253 vapier 1.91 if (!multi_stack) { \
254     *found_phdr = 1; \
255     shown = 1; \
256     memcpy(ret, "!WX", 3); \
257     } \
258 vapier 1.39 } \
259     }
260 solar 1.73 SHOW_PHDR(32)
261     SHOW_PHDR(64)
262 vapier 1.44
263 solar 1.127 if (be_wewy_wewy_quiet || (be_quiet && !shown))
264 vapier 1.41 return NULL;
265     else
266     return ret;
267 vapier 1.39 }
268 vapier 1.90 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
269 vapier 1.39 {
270 vapier 1.90 static const char *ret = "TEXTREL";
271 vapier 1.44 unsigned long i;
272 vapier 1.41
273 vapier 1.79 if (!show_textrel && !show_textrels) return NULL;
274 vapier 1.41
275 vapier 1.44 if (elf->phdr) {
276 vapier 1.39 #define SHOW_TEXTREL(B) \
277     if (elf->elf_class == ELFCLASS ## B) { \
278     Elf ## B ## _Dyn *dyn; \
279     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
280     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
281 vapier 1.44 Elf ## B ## _Off offset; \
282 vapier 1.39 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
283 vapier 1.59 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
284 vapier 1.44 offset = EGET(phdr[i].p_offset); \
285     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
286     dyn = DYN ## B (elf->data + offset); \
287 vapier 1.39 while (EGET(dyn->d_tag) != DT_NULL) { \
288     if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
289     *found_textrel = 1; \
290     /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
291 solar 1.127 return (be_wewy_wewy_quiet ? NULL : ret); \
292 vapier 1.39 } \
293     ++dyn; \
294 vapier 1.26 } \
295 vapier 1.39 } }
296     SHOW_TEXTREL(32)
297     SHOW_TEXTREL(64)
298 vapier 1.44 }
299    
300 solar 1.127 if (be_quiet || be_wewy_wewy_quiet)
301 vapier 1.41 return NULL;
302     else
303 vapier 1.90 return " - ";
304 vapier 1.39 }
305 vapier 1.79 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
306 vapier 1.76 {
307 vapier 1.82 unsigned long s, r, rmax;
308     void *symtab_void, *strtab_void, *text_void;
309 vapier 1.76
310     if (!show_textrels) return NULL;
311    
312 vapier 1.79 /* don't search for TEXTREL's if the ELF doesn't have any */
313     if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
314     if (!*found_textrel) return NULL;
315    
316 vapier 1.77 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
317 vapier 1.82 text_void = elf_findsecbyname(elf, ".text");
318 vapier 1.76
319 vapier 1.82 if (symtab_void && strtab_void && text_void && elf->shdr) {
320 vapier 1.76 #define SHOW_TEXTRELS(B) \
321     if (elf->elf_class == ELFCLASS ## B) { \
322     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
323     Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
324     Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
325     Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
326 vapier 1.82 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
327     Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
328     uint ## B ## _t memsz = EGET(text->sh_size); \
329 vapier 1.76 Elf ## B ## _Rel *rel; \
330     Elf ## B ## _Rela *rela; \
331     /* search the section headers for relocations */ \
332     for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
333     uint32_t sh_type = EGET(shdr[s].sh_type); \
334     if (sh_type == SHT_REL) { \
335     rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
336     rela = NULL; \
337     rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
338     } else if (sh_type == SHT_RELA) { \
339     rel = NULL; \
340     rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
341     rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
342     } else \
343     continue; \
344 vapier 1.82 /* now see if any of the relocs are in the .text */ \
345     for (r = 0; r < rmax; ++r) { \
346     unsigned long sym_max; \
347     Elf ## B ## _Addr offset_tmp; \
348     Elf ## B ## _Sym *func; \
349     Elf ## B ## _Sym *sym; \
350     Elf ## B ## _Addr r_offset; \
351     uint ## B ## _t r_info; \
352     if (sh_type == SHT_REL) { \
353     r_offset = EGET(rel[r].r_offset); \
354     r_info = EGET(rel[r].r_info); \
355     } else { \
356     r_offset = EGET(rela[r].r_offset); \
357     r_info = EGET(rela[r].r_info); \
358     } \
359     /* make sure this relocation is inside of the .text */ \
360     if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
361     if (be_verbose <= 2) continue; \
362     } else \
363 vapier 1.78 *found_textrels = 1; \
364 vapier 1.82 /* locate this relocation symbol name */ \
365     sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
366 vapier 1.112 if ((void*)sym > (void*)elf->data_end) { \
367 vapier 1.111 warn("%s: corrupt ELF symbol", elf->filename); \
368 vapier 1.109 continue; \
369     } \
370 vapier 1.82 sym_max = ELF ## B ## _R_SYM(r_info); \
371     if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
372     sym += sym_max; \
373     else \
374     sym = NULL; \
375     sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
376     /* show the raw details about this reloc */ \
377 vapier 1.88 printf(" %s: ", elf->base_filename); \
378 vapier 1.82 if (sym && sym->st_name) \
379     printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
380     else \
381 vapier 1.88 printf("(memory/fake?)"); \
382 vapier 1.82 printf(" [0x%lX]", (unsigned long)r_offset); \
383     /* now try to find the closest symbol that this rel is probably in */ \
384     sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
385     func = NULL; \
386     offset_tmp = 0; \
387     while (sym_max--) { \
388     if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
389     func = sym; \
390     offset_tmp = EGET(sym->st_value); \
391 vapier 1.76 } \
392 vapier 1.82 ++sym; \
393 vapier 1.76 } \
394 vapier 1.82 printf(" in "); \
395     if (func && func->st_name) \
396     printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
397     else \
398     printf("(NULL: fake?)"); \
399     printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
400 vapier 1.76 } \
401     } }
402     SHOW_TEXTRELS(32)
403     SHOW_TEXTRELS(64)
404     }
405 vapier 1.82 if (!*found_textrels)
406     warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
407 vapier 1.76
408     return NULL;
409     }
410 solar 1.83
411 vapier 1.102 static void rpath_security_checks(elfobj *, char *, const char *);
412     static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
413 vapier 1.100 {
414 solar 1.83 struct stat st;
415 vapier 1.84 switch (*item) {
416 vapier 1.89 case '/': break;
417     case '.':
418 vapier 1.102 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
419 vapier 1.89 break;
420 vapier 1.100 case ':':
421 vapier 1.89 case '\0':
422 vapier 1.102 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
423 solar 1.83 break;
424     case '$':
425 vapier 1.84 if (fstat(elf->fd, &st) != -1)
426 solar 1.83 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
427 vapier 1.102 warnf("Security problem with %s='%s' in %s with mode set of %o",
428     dt_type, item, elf->filename, st.st_mode & 07777);
429 solar 1.83 break;
430     default:
431 vapier 1.102 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
432 solar 1.83 break;
433     }
434     }
435 vapier 1.41 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
436 vapier 1.39 {
437 vapier 1.48 unsigned long i, s;
438     char *rpath, *runpath, **r;
439 vapier 1.39 void *strtbl_void;
440 vapier 1.10
441 vapier 1.39 if (!show_rpath) return;
442 vapier 1.10
443 vapier 1.39 strtbl_void = elf_findsecbyname(elf, ".dynstr");
444     rpath = runpath = NULL;
445 vapier 1.10
446 vapier 1.44 if (elf->phdr && strtbl_void) {
447 vapier 1.26 #define SHOW_RPATH(B) \
448     if (elf->elf_class == ELFCLASS ## B) { \
449     Elf ## B ## _Dyn *dyn; \
450     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
451     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
452     Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
453 vapier 1.44 Elf ## B ## _Off offset; \
454 vapier 1.60 Elf ## B ## _Xword word; \
455 vapier 1.48 /* Scan all the program headers */ \
456 vapier 1.26 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
457 vapier 1.48 /* Just scan dynamic headers */ \
458 vapier 1.26 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
459 vapier 1.44 offset = EGET(phdr[i].p_offset); \
460     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
461 vapier 1.48 /* Just scan dynamic RPATH/RUNPATH headers */ \
462 vapier 1.44 dyn = DYN ## B (elf->data + offset); \
463 vapier 1.48 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
464     if (word == DT_RPATH) { \
465     r = &rpath; \
466     } else if (word == DT_RUNPATH) { \
467     r = &runpath; \
468     } else { \
469     ++dyn; \
470     continue; \
471     } \
472     /* Verify the memory is somewhat sane */ \
473     offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
474 vapier 1.69 if (offset < (Elf ## B ## _Off)elf->len) { \
475 vapier 1.48 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
476     *r = (char*)(elf->data + offset); \
477 vapier 1.103 /* cache the length in case we need to nuke this section later on */ \
478     if (fix_elf) \
479     offset = strlen(*r); \
480 vapier 1.48 /* If quiet, don't output paths in ld.so.conf */ \
481 vapier 1.69 if (be_quiet) { \
482     size_t len; \
483     char *start, *end; \
484 vapier 1.75 /* note that we only 'chop' off leading known paths. */ \
485     /* since *r is read-only memory, we can only move the ptr forward. */ \
486     start = *r; \
487     /* scan each path in : delimited list */ \
488     while (start) { \
489 vapier 1.102 rpath_security_checks(elf, start, get_elfdtype(word)); \
490 vapier 1.69 end = strchr(start, ':'); \
491 vapier 1.75 len = (end ? abs(end - start) : strlen(start)); \
492 vapier 1.102 if (use_ldcache) \
493     for (s = 0; ldpaths[s]; ++s) \
494     if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
495     *r = end; \
496     /* corner case ... if RPATH reads "/usr/lib:", we want \
497     * to show ':' rather than '' */ \
498     if (end && end[1] != '\0') \
499     (*r)++; \
500     break; \
501     } \
502 vapier 1.100 if (!*r || !end) \
503     break; \
504 vapier 1.75 else \
505     start = start + len + 1; \
506 vapier 1.69 } \
507     } \
508 vapier 1.101 if (*r) { \
509 solar 1.107 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
510 vapier 1.101 /* just nuke it */ \
511     nuke_it##B: \
512 vapier 1.103 memset(*r, 0x00, offset); \
513 vapier 1.102 *r = NULL; \
514 vapier 1.101 ESET(dyn->d_tag, DT_DEBUG); \
515 vapier 1.103 ESET(dyn->d_un.d_ptr, 0); \
516 vapier 1.101 } else if (fix_elf) { \
517     /* try to clean "bad" paths */ \
518     size_t len, tmpdir_len; \
519     char *start, *end; \
520     const char *tmpdir; \
521     start = *r; \
522     tmpdir = (getenv("TMPDIR") ? : "."); \
523     tmpdir_len = strlen(tmpdir); \
524     while (1) { \
525     end = strchr(start, ':'); \
526     if (start == end) { \
527     eat_this_path##B: \
528     len = strlen(end); \
529     memmove(start, end+1, len); \
530     start[len-1] = '\0'; \
531     end = start - 1; \
532     } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
533     if (!end) { \
534     if (start == *r) \
535     goto nuke_it##B; \
536     *--start = '\0'; \
537     } else \
538     goto eat_this_path##B; \
539     } \
540     if (!end) \
541     break; \
542     start = end + 1; \
543     } \
544 vapier 1.102 if (**r == '\0') \
545     goto nuke_it##B; \
546 vapier 1.101 } \
547 vapier 1.102 if (*r) \
548     *found_rpath = 1; \
549 vapier 1.101 } \
550 vapier 1.26 } \
551     ++dyn; \
552     } \
553     } }
554     SHOW_RPATH(32)
555     SHOW_RPATH(64)
556 vapier 1.10 }
557 vapier 1.41
558 solar 1.127 if (be_wewy_wewy_quiet) return;
559 vapier 1.70
560 vapier 1.39 if (rpath && runpath) {
561 vapier 1.41 if (!strcmp(rpath, runpath)) {
562     xstrcat(ret, runpath, ret_len);
563     } else {
564 vapier 1.39 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
565 vapier 1.41 xchrcat(ret, '{', ret_len);
566     xstrcat(ret, rpath, ret_len);
567     xchrcat(ret, ',', ret_len);
568     xstrcat(ret, runpath, ret_len);
569     xchrcat(ret, '}', ret_len);
570 vapier 1.39 }
571     } else if (rpath || runpath)
572 vapier 1.41 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
573     else if (!be_quiet)
574     xstrcat(ret, " - ", ret_len);
575 vapier 1.39 }
576 solar 1.96
577     #define LDSO_CACHE_MAGIC "ld.so-"
578     #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
579     #define LDSO_CACHE_VER "1.7.0"
580     #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
581 vapier 1.97 #define FLAG_ANY -1
582     #define FLAG_TYPE_MASK 0x00ff
583     #define FLAG_LIBC4 0x0000
584     #define FLAG_ELF 0x0001
585     #define FLAG_ELF_LIBC5 0x0002
586     #define FLAG_ELF_LIBC6 0x0003
587     #define FLAG_REQUIRED_MASK 0xff00
588     #define FLAG_SPARC_LIB64 0x0100
589     #define FLAG_IA64_LIB64 0x0200
590     #define FLAG_X8664_LIB64 0x0300
591     #define FLAG_S390_LIB64 0x0400
592     #define FLAG_POWERPC_LIB64 0x0500
593     #define FLAG_MIPS64_LIBN32 0x0600
594     #define FLAG_MIPS64_LIBN64 0x0700
595 solar 1.96
596 vapier 1.97 static char *lookup_cache_lib(elfobj *, char *);
597     static char *lookup_cache_lib(elfobj *elf, char *fname)
598 solar 1.96 {
599     int fd = 0;
600     char *strs;
601 vapier 1.104 static char buf[__PAX_UTILS_PATH_MAX] = "";
602 solar 1.96 const char *cachefile = "/etc/ld.so.cache";
603     struct stat st;
604    
605     typedef struct {
606     char magic[LDSO_CACHE_MAGIC_LEN];
607     char version[LDSO_CACHE_VER_LEN];
608     int nlibs;
609     } header_t;
610 vapier 1.97 header_t *header;
611 solar 1.96
612     typedef struct {
613     int flags;
614     int sooffset;
615     int liboffset;
616     } libentry_t;
617     libentry_t *libent;
618    
619     if (fname == NULL)
620     return NULL;
621    
622     if (ldcache == 0) {
623 vapier 1.97 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
624 solar 1.96 return NULL;
625 vapier 1.97
626     /* cache these values so we only map/unmap the cache file once */
627 solar 1.96 ldcache_size = st.st_size;
628 vapier 1.97 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
629    
630     close(fd);
631 solar 1.96
632 solar 1.116 if (ldcache == (caddr_t)-1) {
633     ldcache = 0;
634 solar 1.96 return NULL;
635 solar 1.116 }
636 solar 1.96
637     if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
638     return NULL;
639     if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
640     return NULL;
641     }
642    
643     header = (header_t *) ldcache;
644     libent = (libentry_t *) (ldcache + sizeof(header_t));
645     strs = (char *) &libent[header->nlibs];
646    
647     for (fd = 0; fd < header->nlibs; fd++) {
648 vapier 1.97 /* this should be more fine grained, but for now we assume that
649     * diff arches will not be cached together. and we ignore the
650     * the different multilib mips cases. */
651     if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
652     continue;
653     if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
654     continue;
655    
656 solar 1.96 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
657     continue;
658     strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
659     }
660     return buf;
661     }
662    
663    
664 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)
665 vapier 1.39 {
666 vapier 1.44 unsigned long i;
667 vapier 1.39 char *needed;
668     void *strtbl_void;
669 solar 1.96 char *p;
670 vapier 1.39
671 vapier 1.72 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
672 vapier 1.10
673 vapier 1.39 strtbl_void = elf_findsecbyname(elf, ".dynstr");
674 vapier 1.32
675 vapier 1.44 if (elf->phdr && strtbl_void) {
676 vapier 1.32 #define SHOW_NEEDED(B) \
677     if (elf->elf_class == ELFCLASS ## B) { \
678     Elf ## B ## _Dyn *dyn; \
679     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
680     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
681     Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
682 vapier 1.44 Elf ## B ## _Off offset; \
683 vapier 1.32 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
684     if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
685 vapier 1.44 offset = EGET(phdr[i].p_offset); \
686     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
687     dyn = DYN ## B (elf->data + offset); \
688 vapier 1.32 while (EGET(dyn->d_tag) != DT_NULL) { \
689     if (EGET(dyn->d_tag) == DT_NEEDED) { \
690 vapier 1.44 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
691 vapier 1.69 if (offset >= (Elf ## B ## _Off)elf->len) { \
692 vapier 1.49 ++dyn; \
693     continue; \
694     } \
695 vapier 1.44 needed = (char*)(elf->data + offset); \
696 vapier 1.72 if (op == 0) { \
697 solar 1.127 if (!be_wewy_wewy_quiet) { \
698 vapier 1.72 if (*found_needed) xchrcat(ret, ',', ret_len); \
699 vapier 1.102 if (use_ldcache) \
700 vapier 1.97 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
701 solar 1.96 needed = p; \
702 vapier 1.72 xstrcat(ret, needed, ret_len); \
703     } \
704     *found_needed = 1; \
705     } else { \
706 solar 1.86 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
707 vapier 1.81 *found_lib = 1; \
708 solar 1.127 return (be_wewy_wewy_quiet ? NULL : needed); \
709 vapier 1.81 } \
710 vapier 1.72 } \
711 vapier 1.32 } \
712     ++dyn; \
713     } \
714     } }
715     SHOW_NEEDED(32)
716     SHOW_NEEDED(64)
717 vapier 1.85 if (op == 0 && !*found_needed && be_verbose)
718 vapier 1.84 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
719 vapier 1.32 }
720 vapier 1.72
721     return NULL;
722 vapier 1.39 }
723 vapier 1.41 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
724 vapier 1.39 {
725     void *strtbl_void;
726    
727 vapier 1.41 if (!show_interp) return NULL;
728 vapier 1.32
729 vapier 1.39 strtbl_void = elf_findsecbyname(elf, ".interp");
730 vapier 1.38
731 vapier 1.39 if (strtbl_void) {
732 vapier 1.38 #define SHOW_INTERP(B) \
733     if (elf->elf_class == ELFCLASS ## B) { \
734 solar 1.40 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
735     *found_interp = 1; \
736 solar 1.127 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
737 vapier 1.38 }
738     SHOW_INTERP(32)
739     SHOW_INTERP(64)
740     }
741 vapier 1.41 return NULL;
742 vapier 1.39 }
743 vapier 1.49 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
744     {
745     unsigned long i;
746     struct stat s;
747 solar 1.131 char dynamic = 0;
748 vapier 1.49
749     if (!show_bind) return NULL;
750 vapier 1.51 if (!elf->phdr) return NULL;
751 vapier 1.49
752     #define SHOW_BIND(B) \
753     if (elf->elf_class == ELFCLASS ## B) { \
754     Elf ## B ## _Dyn *dyn; \
755     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
756     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
757     Elf ## B ## _Off offset; \
758     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
759     if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
760 solar 1.131 dynamic = 1; \
761 vapier 1.49 offset = EGET(phdr[i].p_offset); \
762     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
763     dyn = DYN ## B (elf->data + offset); \
764     while (EGET(dyn->d_tag) != DT_NULL) { \
765     if (EGET(dyn->d_tag) == DT_BIND_NOW || \
766     (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
767     { \
768     if (be_quiet) return NULL; \
769     *found_bind = 1; \
770 solar 1.127 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
771 vapier 1.49 } \
772     ++dyn; \
773     } \
774     } \
775     }
776     SHOW_BIND(32)
777     SHOW_BIND(64)
778    
779 solar 1.127 if (be_wewy_wewy_quiet) return NULL;
780 vapier 1.70
781 vapier 1.56 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
782 vapier 1.49 return NULL;
783     } else {
784     *found_bind = 1;
785 solar 1.131 return (char *) (dynamic ? "LAZY" : "STATIC");
786 vapier 1.49 }
787     }
788 vapier 1.84 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
789     {
790     unsigned long i;
791     char *soname;
792     void *strtbl_void;
793    
794     if (!show_soname) return NULL;
795    
796     strtbl_void = elf_findsecbyname(elf, ".dynstr");
797    
798     if (elf->phdr && strtbl_void) {
799     #define SHOW_SONAME(B) \
800     if (elf->elf_class == ELFCLASS ## B) { \
801     Elf ## B ## _Dyn *dyn; \
802     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
803     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
804     Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
805     Elf ## B ## _Off offset; \
806     /* only look for soname in shared objects */ \
807     if (ehdr->e_type != ET_DYN) \
808     return NULL; \
809     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
810     if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
811     offset = EGET(phdr[i].p_offset); \
812     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
813     dyn = DYN ## B (elf->data + offset); \
814     while (EGET(dyn->d_tag) != DT_NULL) { \
815     if (EGET(dyn->d_tag) == DT_SONAME) { \
816     offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
817     if (offset >= (Elf ## B ## _Off)elf->len) { \
818     ++dyn; \
819     continue; \
820     } \
821     soname = (char*)(elf->data + offset); \
822     *found_soname = 1; \
823 solar 1.127 return (be_wewy_wewy_quiet ? NULL : soname); \
824 vapier 1.84 } \
825     ++dyn; \
826     } \
827     } }
828     SHOW_SONAME(32)
829     SHOW_SONAME(64)
830     }
831    
832     return NULL;
833     }
834 vapier 1.72 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
835 vapier 1.39 {
836 vapier 1.44 unsigned long i;
837 vapier 1.95 char *ret;
838 vapier 1.39 void *symtab_void, *strtab_void;
839 vapier 1.38
840 vapier 1.41 if (!find_sym) return NULL;
841 vapier 1.95 ret = find_sym;
842 vapier 1.32
843 vapier 1.77 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
844 vapier 1.27
845 vapier 1.39 if (symtab_void && strtab_void) {
846 vapier 1.27 #define FIND_SYM(B) \
847     if (elf->elf_class == ELFCLASS ## B) { \
848     Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
849     Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
850     Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
851 vapier 1.115 unsigned long cnt = EGET(symtab->sh_entsize); \
852 vapier 1.27 char *symname; \
853 vapier 1.115 if (cnt) \
854     cnt = EGET(symtab->sh_size) / cnt; \
855 vapier 1.27 for (i = 0; i < cnt; ++i) { \
856     if (sym->st_name) { \
857 vapier 1.134 /* make sure the symbol name is in acceptable memory range */ \
858 vapier 1.27 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
859 vapier 1.115 if ((void*)symname > (void*)elf->data_end) { \
860     warnf("%s: corrupt ELF symbols", elf->filename); \
861 vapier 1.134 ++sym; \
862 vapier 1.111 continue; \
863     } \
864 vapier 1.134 /* debug display ... show all symbols and some extra info */ \
865     if (*ret == '*') { \
866 vapier 1.32 printf("%s(%s) %5lX %15s %s\n", \
867 vapier 1.39 ((*found_sym == 0) ? "\n\t" : "\t"), \
868 vapier 1.76 elf->base_filename, \
869 vapier 1.94 (unsigned long)sym->st_size, \
870 vapier 1.95 get_elfstttype(sym->st_info), \
871 vapier 1.32 symname); \
872 vapier 1.39 *found_sym = 1; \
873 vapier 1.95 } else { \
874 vapier 1.134 /* allow the user to specify a comma delimited list of symbols to search for */ \
875 vapier 1.95 char *this_sym, *next_sym; \
876 vapier 1.134 this_sym = ret; \
877 vapier 1.95 do { \
878     next_sym = strchr(this_sym, ','); \
879     if (next_sym == NULL) \
880     next_sym = this_sym + strlen(this_sym); \
881 vapier 1.134 /* do we want a defined symbol ? */ \
882     if (*this_sym == '+') { \
883     if (sym->st_value == 0) \
884     goto skip_this_sym##B; \
885     ++this_sym; \
886     /* do we want an undefined symbol ? */ \
887     } else if (*this_sym == '-') { \
888     if (sym->st_value != 0) \
889     goto skip_this_sym##B; \
890     ++this_sym; \
891     } \
892     /* ok, lets compare the name now */ \
893 vapier 1.95 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
894     (strcmp(symname, versioned_symname) == 0)) { \
895 solar 1.132 if (be_semi_verbose) { \
896     char buf[126]; \
897     snprintf(buf, sizeof(buf), "%lX %s %s", \
898     (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
899     ret = buf; \
900     } else \
901     ret = this_sym; \
902 vapier 1.95 (*found_sym)++; \
903     goto break_out; \
904     } \
905 vapier 1.134 skip_this_sym##B: this_sym = next_sym + 1; \
906 vapier 1.95 } while (*next_sym != '\0'); \
907     } \
908 vapier 1.27 } \
909     ++sym; \
910     } }
911     FIND_SYM(32)
912     FIND_SYM(64)
913 vapier 1.39 }
914 vapier 1.70
915 vapier 1.95 break_out:
916 solar 1.127 if (be_wewy_wewy_quiet) return NULL;
917 vapier 1.70
918 vapier 1.41 if (*find_sym != '*' && *found_sym)
919 vapier 1.95 return ret;
920 vapier 1.41 if (be_quiet)
921     return NULL;
922     else
923 solar 1.68 return (char *)" - ";
924 vapier 1.39 }
925 solar 1.119
926    
927 solar 1.124 static char *scanelf_file_sections(elfobj *elf, char *found_section)
928     {
929     if (!find_section)
930     return NULL;
931    
932     #define FIND_SECTION(B) \
933     if (elf->elf_class == ELFCLASS ## B) { \
934     Elf ## B ## _Shdr *section; \
935     section = SHDR ## B (elf_findsecbyname(elf, find_section)); \
936     if (section != NULL) \
937     *found_section = 1; \
938     }
939     FIND_SECTION(32)
940     FIND_SECTION(64)
941    
942    
943 solar 1.127 if (be_wewy_wewy_quiet) return NULL;
944 solar 1.124
945     if (*found_section)
946     return find_section;
947    
948     if (be_quiet)
949     return NULL;
950     else
951     return (char *)" - ";
952     }
953    
954 vapier 1.39 /* scan an elf file and show all the fun stuff */
955 solar 1.57 #define prints(str) write(fileno(stdout), str, strlen(str))
956 vapier 1.106 static int scanelf_elfobj(elfobj *elf)
957 vapier 1.39 {
958 vapier 1.44 unsigned long i;
959 solar 1.73 char found_pax, found_phdr, found_relro, found_load, found_textrel,
960 vapier 1.84 found_rpath, found_needed, found_interp, found_bind, found_soname,
961 solar 1.124 found_sym, found_lib, found_file, found_textrels, found_section;
962 vapier 1.41 static char *out_buffer = NULL;
963     static size_t out_len;
964 vapier 1.39
965 vapier 1.76 found_pax = found_phdr = found_relro = found_load = found_textrel = \
966 vapier 1.84 found_rpath = found_needed = found_interp = found_bind = found_soname = \
967 solar 1.124 found_sym = found_lib = found_file = found_textrels = found_section = 0;
968 vapier 1.39
969 vapier 1.114 if (be_verbose > 2)
970 vapier 1.106 printf("%s: scanning file {%s,%s}\n", elf->filename,
971 vapier 1.69 get_elfeitype(EI_CLASS, elf->elf_class),
972     get_elfeitype(EI_DATA, elf->data[EI_DATA]));
973 vapier 1.114 else if (be_verbose > 1)
974 vapier 1.106 printf("%s: scanning file\n", elf->filename);
975 vapier 1.39
976 vapier 1.41 /* init output buffer */
977     if (!out_buffer) {
978     out_len = sizeof(char) * 80;
979     out_buffer = (char*)xmalloc(out_len);
980     }
981     *out_buffer = '\0';
982    
983 vapier 1.39 /* show the header */
984     if (!be_quiet && show_banner) {
985 vapier 1.49 for (i = 0; out_format[i]; ++i) {
986 vapier 1.70 if (!IS_MODIFIER(out_format[i])) continue;
987 vapier 1.41
988     switch (out_format[++i]) {
989 solar 1.132 case '+': break;
990 vapier 1.41 case '%': break;
991 vapier 1.70 case '#': break;
992 vapier 1.66 case 'F':
993     case 'p':
994     case 'f': prints("FILE "); found_file = 1; break;
995 vapier 1.41 case 'o': prints(" TYPE "); break;
996     case 'x': prints(" PAX "); break;
997 vapier 1.71 case 'e': prints("STK/REL/PTL "); break;
998 vapier 1.41 case 't': prints("TEXTREL "); break;
999     case 'r': prints("RPATH "); break;
1000     case 'n': prints("NEEDED "); break;
1001     case 'i': prints("INTERP "); break;
1002 vapier 1.49 case 'b': prints("BIND "); break;
1003 vapier 1.84 case 'S': prints("SONAME "); break;
1004 vapier 1.41 case 's': prints("SYM "); break;
1005 vapier 1.72 case 'N': prints("LIB "); break;
1006 vapier 1.76 case 'T': prints("TEXTRELS "); break;
1007 vapier 1.126 case 'k': prints("SECTION "); break;
1008 vapier 1.76 default: warnf("'%c' has no title ?", out_format[i]);
1009 vapier 1.39 }
1010 vapier 1.27 }
1011 vapier 1.49 if (!found_file) prints("FILE ");
1012 vapier 1.41 prints("\n");
1013 vapier 1.49 found_file = 0;
1014 vapier 1.39 show_banner = 0;
1015     }
1016    
1017     /* dump all the good stuff */
1018 vapier 1.49 for (i = 0; out_format[i]; ++i) {
1019 vapier 1.41 const char *out;
1020 vapier 1.66 const char *tmp;
1021 vapier 1.41
1022 vapier 1.70 if (!IS_MODIFIER(out_format[i])) {
1023 vapier 1.41 xchrcat(&out_buffer, out_format[i], &out_len);
1024     continue;
1025     }
1026 vapier 1.39
1027 vapier 1.41 out = NULL;
1028 solar 1.127 be_wewy_wewy_quiet = (out_format[i] == '#');
1029 solar 1.132 be_semi_verbose = (out_format[i] == '+');
1030 vapier 1.41 switch (out_format[++i]) {
1031 solar 1.132 case '+':
1032 vapier 1.70 case '%':
1033     case '#':
1034     xchrcat(&out_buffer, out_format[i], &out_len); break;
1035     case 'F':
1036 vapier 1.76 found_file = 1;
1037 solar 1.127 if (be_wewy_wewy_quiet) break;
1038 vapier 1.106 xstrcat(&out_buffer, elf->filename, &out_len);
1039 vapier 1.70 break;
1040 vapier 1.66 case 'p':
1041 vapier 1.76 found_file = 1;
1042 solar 1.127 if (be_wewy_wewy_quiet) break;
1043 vapier 1.106 tmp = elf->filename;
1044 vapier 1.66 if (search_path) {
1045     ssize_t len_search = strlen(search_path);
1046 vapier 1.106 ssize_t len_file = strlen(elf->filename);
1047     if (!strncmp(elf->filename, search_path, len_search) && \
1048 vapier 1.66 len_file > len_search)
1049     tmp += len_search;
1050     if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1051     }
1052     xstrcat(&out_buffer, tmp, &out_len);
1053     break;
1054     case 'f':
1055 vapier 1.76 found_file = 1;
1056 solar 1.127 if (be_wewy_wewy_quiet) break;
1057 vapier 1.106 tmp = strrchr(elf->filename, '/');
1058     tmp = (tmp == NULL ? elf->filename : tmp+1);
1059 vapier 1.66 xstrcat(&out_buffer, tmp, &out_len);
1060     break;
1061 vapier 1.41 case 'o': out = get_elfetype(elf); break;
1062     case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1063 solar 1.73 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1064 vapier 1.41 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1065 vapier 1.79 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1066 vapier 1.41 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1067 vapier 1.72 case 'n':
1068     case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1069 vapier 1.41 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1070 vapier 1.49 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1071 vapier 1.84 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1072 vapier 1.72 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1073 solar 1.124 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1074 vapier 1.76 default: warnf("'%c' has no scan code?", out_format[i]);
1075 vapier 1.29 }
1076 vapier 1.95 if (out) {
1077     /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1078     if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1079     xstrncat(&out_buffer, out, &out_len, (tmp-out));
1080     else
1081     xstrcat(&out_buffer, out, &out_len);
1082     }
1083 vapier 1.39 }
1084    
1085 vapier 1.54 #define FOUND_SOMETHING() \
1086 solar 1.73 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1087 vapier 1.76 found_rpath || found_needed || found_interp || found_bind || \
1088 solar 1.124 found_soname || found_sym || found_lib || found_textrels || found_section )
1089 vapier 1.54
1090     if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1091     xchrcat(&out_buffer, ' ', &out_len);
1092 vapier 1.106 xstrcat(&out_buffer, elf->filename, &out_len);
1093 vapier 1.27 }
1094 vapier 1.79 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1095 vapier 1.41 puts(out_buffer);
1096 vapier 1.79 fflush(stdout);
1097     }
1098 vapier 1.10
1099 vapier 1.105 return 0;
1100     }
1101    
1102 vapier 1.106 /* scan a single elf */
1103     static int scanelf_elf(const char *filename, int fd, size_t len)
1104     {
1105 solar 1.120 int ret = 1;
1106 vapier 1.106 elfobj *elf;
1107    
1108     /* verify this is real ELF */
1109     if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1110     if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1111 solar 1.120 return ret;
1112     }
1113     switch (match_bits) {
1114     case 32:
1115     if (elf->elf_class != ELFCLASS32)
1116     goto label_done;
1117     break;
1118     case 64:
1119     if (elf->elf_class != ELFCLASS64)
1120     goto label_done;
1121     break;
1122     default: break;
1123 vapier 1.106 }
1124 solar 1.119 if (strlen(match_etypes)) {
1125     char sbuf[126];
1126     strncpy(sbuf, match_etypes, sizeof(sbuf));
1127     if (strchr(match_etypes, ',') != NULL) {
1128     char *p;
1129     while((p = strrchr(sbuf, ',')) != NULL) {
1130     *p = 0;
1131 solar 1.129 if (etype_lookup(p+1) == get_etype(elf))
1132 solar 1.119 goto label_ret;
1133     }
1134     }
1135 solar 1.129 if (etype_lookup(sbuf) != get_etype(elf))
1136 solar 1.119 goto label_done;
1137     }
1138    
1139     label_ret:
1140 vapier 1.106 ret = scanelf_elfobj(elf);
1141 solar 1.119
1142     label_done:
1143 vapier 1.106 unreadelf(elf);
1144     return ret;
1145     }
1146 solar 1.119
1147 vapier 1.105 /* scan an archive of elfs */
1148 vapier 1.106 static int scanelf_archive(const char *filename, int fd, size_t len)
1149 vapier 1.105 {
1150 vapier 1.106 archive_handle *ar;
1151 vapier 1.105 archive_member *m;
1152 vapier 1.106 char *ar_buffer;
1153     elfobj *elf;
1154    
1155     ar = ar_open_fd(filename, fd);
1156     if (ar == NULL)
1157     return 1;
1158    
1159     ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1160     while ((m=ar_next(ar)) != NULL) {
1161     elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1162     if (elf) {
1163     scanelf_elfobj(elf);
1164     unreadelf(elf);
1165     }
1166     }
1167     munmap(ar_buffer, len);
1168    
1169 vapier 1.105 return 0;
1170     }
1171     /* scan a file which may be an elf or an archive or some other magical beast */
1172     static void scanelf_file(const char *filename)
1173     {
1174     struct stat st;
1175 vapier 1.106 int fd;
1176 vapier 1.105
1177     /* make sure 'filename' exists */
1178     if (lstat(filename, &st) == -1) {
1179     if (be_verbose > 2) printf("%s: does not exist\n", filename);
1180     return;
1181     }
1182    
1183     /* always handle regular files and handle symlinked files if no -y */
1184     if (S_ISLNK(st.st_mode)) {
1185     if (!scan_symlink) return;
1186     stat(filename, &st);
1187     }
1188     if (!S_ISREG(st.st_mode)) {
1189     if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1190     return;
1191     }
1192    
1193 vapier 1.106 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1194     return;
1195    
1196     if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives)
1197 vapier 1.105 /* if it isn't an ELF, maybe it's an .a archive */
1198 vapier 1.106 scanelf_archive(filename, fd, st.st_size);
1199    
1200     close(fd);
1201 solar 1.6 }
1202    
1203 solar 1.1 /* scan a directory for ET_EXEC files and print when we find one */
1204 vapier 1.10 static void scanelf_dir(const char *path)
1205 solar 1.1 {
1206 vapier 1.10 register DIR *dir;
1207     register struct dirent *dentry;
1208 vapier 1.14 struct stat st_top, st;
1209 vapier 1.104 char buf[__PAX_UTILS_PATH_MAX];
1210 vapier 1.32 size_t pathlen = 0, len = 0;
1211 vapier 1.10
1212     /* make sure path exists */
1213 vapier 1.39 if (lstat(path, &st_top) == -1) {
1214     if (be_verbose > 2) printf("%s: does not exist\n", path);
1215 vapier 1.10 return;
1216 vapier 1.39 }
1217 solar 1.11
1218 vapier 1.10 /* ok, if it isn't a directory, assume we can open it */
1219 vapier 1.14 if (!S_ISDIR(st_top.st_mode)) {
1220 vapier 1.10 scanelf_file(path);
1221     return;
1222     }
1223    
1224     /* now scan the dir looking for fun stuff */
1225     if ((dir = opendir(path)) == NULL) {
1226     warnf("could not opendir %s: %s", path, strerror(errno));
1227     return;
1228     }
1229 vapier 1.114 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1230 solar 1.11
1231 vapier 1.32 pathlen = strlen(path);
1232 vapier 1.10 while ((dentry = readdir(dir))) {
1233     if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1234     continue;
1235 vapier 1.32 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1236     if (len >= sizeof(buf)) {
1237 vapier 1.76 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1238     (unsigned long)len, (unsigned long)sizeof(buf));
1239 vapier 1.32 continue;
1240     }
1241 solar 1.31 sprintf(buf, "%s/%s", path, dentry->d_name);
1242 solar 1.20 if (lstat(buf, &st) != -1) {
1243 vapier 1.10 if (S_ISREG(st.st_mode))
1244 solar 1.20 scanelf_file(buf);
1245 vapier 1.10 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1246 vapier 1.14 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1247 solar 1.20 scanelf_dir(buf);
1248 vapier 1.10 }
1249     }
1250     }
1251     closedir(dir);
1252 solar 1.1 }
1253    
1254 vapier 1.133 static int scanelf_from_file(const char *filename)
1255 vapier 1.47 {
1256 solar 1.45 FILE *fp = NULL;
1257     char *p;
1258 vapier 1.104 char path[__PAX_UTILS_PATH_MAX];
1259 solar 1.45
1260 solar 1.132 if (strcmp(filename, "-") == 0)
1261 solar 1.45 fp = stdin;
1262     else if ((fp = fopen(filename, "r")) == NULL)
1263     return 1;
1264    
1265 vapier 1.104 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1266 solar 1.45 if ((p = strchr(path, '\n')) != NULL)
1267     *p = 0;
1268 vapier 1.66 search_path = path;
1269 solar 1.45 scanelf_dir(path);
1270     }
1271     if (fp != stdin)
1272     fclose(fp);
1273     return 0;
1274     }
1275    
1276 solar 1.123 static int load_ld_so_conf(int i, const char *fname)
1277 vapier 1.48 {
1278     FILE *fp = NULL;
1279     char *p;
1280 vapier 1.104 char path[__PAX_UTILS_PATH_MAX];
1281 vapier 1.48
1282 solar 1.123 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1283     return i;
1284    
1285     if ((fp = fopen(fname, "r")) == NULL)
1286     return i;
1287 vapier 1.48
1288 vapier 1.104 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1289 vapier 1.48 if ((p = strrchr(path, '\r')) != NULL)
1290     *p = 0;
1291     if ((p = strchr(path, '\n')) != NULL)
1292     *p = 0;
1293 solar 1.123 #ifdef HAVE_GLOB
1294     // recursive includes of the same file will make this segfault.
1295 solar 1.129 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1296 solar 1.123 glob64_t gl;
1297     size_t x;
1298     char gpath[__PAX_UTILS_PATH_MAX];
1299    
1300 solar 1.129 memset(gpath, 0, sizeof(gpath));
1301 solar 1.123
1302     if (path[8] != '/')
1303 solar 1.129 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1304 solar 1.123 else
1305 solar 1.129 strncpy(gpath, &path[8], sizeof(gpath));
1306 solar 1.123
1307     if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1308     for (x = 0; x < gl.gl_pathc; ++x) {
1309     /* try to avoid direct loops */
1310     if (strcmp(gl.gl_pathv[x], fname) == 0)
1311     continue;
1312     i = load_ld_so_conf(i, gl.gl_pathv[x]);
1313     if (i + 1 >= sizeof(ldpaths) / sizeof(*ldpaths)) {
1314     globfree64(&gl);
1315     return i;
1316     }
1317     }
1318     globfree64 (&gl);
1319     continue;
1320     } else
1321     abort();
1322     }
1323     #endif
1324     if (*path != '/')
1325     continue;
1326 vapier 1.48
1327     ldpaths[i++] = xstrdup(path);
1328    
1329     if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1330     break;
1331     }
1332     ldpaths[i] = NULL;
1333    
1334     fclose(fp);
1335 solar 1.123 return i;
1336 vapier 1.48 }
1337    
1338 vapier 1.10 /* scan /etc/ld.so.conf for paths */
1339     static void scanelf_ldpath()
1340     {
1341 vapier 1.17 char scan_l, scan_ul, scan_ull;
1342 vapier 1.48 int i = 0;
1343 vapier 1.10
1344 vapier 1.48 if (!ldpaths[0])
1345     err("Unable to load any paths from ld.so.conf");
1346 vapier 1.10
1347 vapier 1.17 scan_l = scan_ul = scan_ull = 0;
1348    
1349 vapier 1.48 while (ldpaths[i]) {
1350     if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1351     if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1352     if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1353     scanelf_dir(ldpaths[i]);
1354     ++i;
1355     }
1356 vapier 1.10
1357 vapier 1.17 if (!scan_l) scanelf_dir("/lib");
1358     if (!scan_ul) scanelf_dir("/usr/lib");
1359     if (!scan_ull) scanelf_dir("/usr/local/lib");
1360 vapier 1.10 }
1361 solar 1.1
1362 vapier 1.10 /* scan env PATH for paths */
1363     static void scanelf_envpath()
1364 solar 1.1 {
1365 solar 1.34 char *path, *p;
1366 vapier 1.10
1367     path = getenv("PATH");
1368     if (!path)
1369     err("PATH is not set in your env !");
1370 vapier 1.41 path = xstrdup(path);
1371 vapier 1.10
1372     while ((p = strrchr(path, ':')) != NULL) {
1373     scanelf_dir(p + 1);
1374     *p = 0;
1375     }
1376 vapier 1.17
1377 solar 1.34 free(path);
1378 solar 1.1 }
1379    
1380 vapier 1.10 /* usage / invocation handling functions */
1381 solar 1.127 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1382 vapier 1.27 #define a_argument required_argument
1383 vapier 1.10 static struct option const long_opts[] = {
1384     {"path", no_argument, NULL, 'p'},
1385     {"ldpath", no_argument, NULL, 'l'},
1386     {"recursive", no_argument, NULL, 'R'},
1387 vapier 1.14 {"mount", no_argument, NULL, 'm'},
1388 vapier 1.37 {"symlink", no_argument, NULL, 'y'},
1389 vapier 1.105 {"archives", no_argument, NULL, 'A'},
1390     {"ldcache", no_argument, NULL, 'L'},
1391 vapier 1.101 {"fix", no_argument, NULL, 'X'},
1392 solar 1.127 {"setpax", a_argument, NULL, 'z'},
1393 vapier 1.10 {"pax", no_argument, NULL, 'x'},
1394 solar 1.16 {"header", no_argument, NULL, 'e'},
1395 vapier 1.10 {"textrel", no_argument, NULL, 't'},
1396     {"rpath", no_argument, NULL, 'r'},
1397 vapier 1.32 {"needed", no_argument, NULL, 'n'},
1398 vapier 1.38 {"interp", no_argument, NULL, 'i'},
1399 vapier 1.49 {"bind", no_argument, NULL, 'b'},
1400 vapier 1.84 {"soname", no_argument, NULL, 'S'},
1401 vapier 1.76 {"symbol", a_argument, NULL, 's'},
1402 solar 1.124 {"section", a_argument, NULL, 'k'},
1403 vapier 1.76 {"lib", a_argument, NULL, 'N'},
1404 solar 1.86 {"gmatch", no_argument, NULL, 'g'},
1405 vapier 1.76 {"textrels", no_argument, NULL, 'T'},
1406 solar 1.119 {"etype", a_argument, NULL, 'E'},
1407 solar 1.120 {"bits", a_argument, NULL, 'M'},
1408 vapier 1.10 {"all", no_argument, NULL, 'a'},
1409     {"quiet", no_argument, NULL, 'q'},
1410 vapier 1.14 {"verbose", no_argument, NULL, 'v'},
1411 vapier 1.76 {"format", a_argument, NULL, 'F'},
1412     {"from", a_argument, NULL, 'f'},
1413     {"file", a_argument, NULL, 'o'},
1414 solar 1.16 {"nobanner", no_argument, NULL, 'B'},
1415 vapier 1.10 {"help", no_argument, NULL, 'h'},
1416     {"version", no_argument, NULL, 'V'},
1417     {NULL, no_argument, NULL, 0x0}
1418     };
1419 solar 1.57
1420 solar 1.68 static const char *opts_help[] = {
1421 vapier 1.10 "Scan all directories in PATH environment",
1422     "Scan all directories in /etc/ld.so.conf",
1423 vapier 1.14 "Scan directories recursively",
1424 vapier 1.37 "Don't recursively cross mount points",
1425 vapier 1.101 "Don't scan symlinks",
1426 vapier 1.105 "Scan archives (.a files)",
1427     "Utilize ld.so.cache information (use with -r/-n)",
1428 solar 1.127 "Try and 'fix' bad things (use with -r/-e)",
1429     "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1430 vapier 1.10 "Print PaX markings",
1431 vapier 1.71 "Print GNU_STACK/PT_LOAD markings",
1432 vapier 1.10 "Print TEXTREL information",
1433     "Print RPATH information",
1434 vapier 1.32 "Print NEEDED information",
1435 vapier 1.38 "Print INTERP information",
1436 vapier 1.49 "Print BIND information",
1437 vapier 1.84 "Print SONAME information",
1438 vapier 1.27 "Find a specified symbol",
1439 solar 1.124 "Find a specified section",
1440 vapier 1.72 "Find a specified library",
1441 solar 1.86 "Use strncmp to match libraries. (use with -N)",
1442 vapier 1.76 "Locate cause of TEXTREL",
1443 solar 1.129 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1444 solar 1.120 "Print only ELF files matching numeric bits",
1445 vapier 1.82 "Print all scanned info (-x -e -t -r -b)\n",
1446 vapier 1.14 "Only output 'bad' things",
1447     "Be verbose (can be specified more than once)",
1448 vapier 1.39 "Use specified format for output",
1449 solar 1.45 "Read input stream from a filename",
1450 vapier 1.24 "Write output stream to a filename",
1451 vapier 1.14 "Don't display the header",
1452 vapier 1.10 "Print this help and exit",
1453     "Print version and exit",
1454     NULL
1455     };
1456    
1457     /* display usage and exit */
1458     static void usage(int status)
1459 solar 1.1 {
1460 vapier 1.44 unsigned long i;
1461 solar 1.52 printf("* Scan ELF binaries for stuff\n\n"
1462 vapier 1.105 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1463 solar 1.35 printf("Options: -[%s]\n", PARSE_FLAGS);
1464 vapier 1.10 for (i = 0; long_opts[i].name; ++i)
1465 vapier 1.27 if (long_opts[i].has_arg == no_argument)
1466 solar 1.124 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1467 vapier 1.27 long_opts[i].name, opts_help[i]);
1468     else
1469 solar 1.124 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1470 vapier 1.27 long_opts[i].name, opts_help[i]);
1471 solar 1.45
1472     if (status != EXIT_SUCCESS)
1473     exit(status);
1474 solar 1.125
1475 vapier 1.46 puts("\nThe format modifiers for the -F option are:");
1476 vapier 1.70 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1477     puts(" t TEXTREL \tr RPATH \tn NEEDED");
1478     puts(" i INTERP \tb BIND \ts symbol");
1479 vapier 1.76 puts(" N library \to Type \tT TEXTRELs");
1480 solar 1.125 puts(" S SONAME \tk section");
1481 vapier 1.70 puts(" p filename (with search path removed)");
1482 vapier 1.88 puts(" f filename (short name/basename)");
1483 vapier 1.70 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1484 solar 1.45
1485 solar 1.121 puts("\nELF Etypes:");
1486     print_etypes(stdout);
1487    
1488 vapier 1.10 exit(status);
1489 solar 1.1 }
1490    
1491     /* parse command line arguments and preform needed actions */
1492 vapier 1.10 static void parseargs(int argc, char *argv[])
1493     {
1494 vapier 1.48 int i;
1495 vapier 1.133 const char *from_file = NULL;
1496 vapier 1.10
1497     opterr = 0;
1498 vapier 1.48 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1499     switch (i) {
1500 vapier 1.10
1501 vapier 1.39 case 'V':
1502 vapier 1.80 printf("pax-utils-%s: %s compiled %s\n%s\n"
1503     "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1504     VERSION, __FILE__, __DATE__, rcsid, argv0);
1505 vapier 1.10 exit(EXIT_SUCCESS);
1506     break;
1507     case 'h': usage(EXIT_SUCCESS); break;
1508 solar 1.45 case 'f':
1509 vapier 1.100 if (from_file) warn("You prob don't want to specify -f twice");
1510     from_file = optarg;
1511 solar 1.45 break;
1512 solar 1.119 case 'E':
1513     strncpy(match_etypes, optarg, sizeof(match_etypes));
1514     break;
1515 solar 1.120 case 'M':
1516     match_bits = atoi(optarg);
1517     break;
1518 vapier 1.24 case 'o': {
1519 solar 1.21 FILE *fp = NULL;
1520 solar 1.64 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1521 vapier 1.24 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1522 vapier 1.65 SET_STDOUT(fp);
1523 solar 1.21 break;
1524     }
1525 solar 1.124 case 'k':
1526 vapier 1.126 if (find_section) warn("You prob don't want to specify -k twice");
1527 solar 1.124 find_section = optarg;
1528     break;
1529 vapier 1.39 case 's': {
1530 vapier 1.93 if (find_sym) warn("You prob don't want to specify -s twice");
1531     find_sym = optarg;
1532     versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1533 vapier 1.39 sprintf(versioned_symname, "%s@", find_sym);
1534     break;
1535     }
1536 vapier 1.72 case 'N': {
1537 vapier 1.93 if (find_lib) warn("You prob don't want to specify -N twice");
1538     find_lib = optarg;
1539 vapier 1.72 break;
1540     }
1541 vapier 1.39
1542     case 'F': {
1543 vapier 1.93 if (out_format) warn("You prob don't want to specify -F twice");
1544     out_format = optarg;
1545 vapier 1.39 break;
1546     }
1547 solar 1.127 case 'z': {
1548 solar 1.129 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1549 solar 1.127 size_t x;
1550 vapier 1.27
1551 solar 1.127 for (x = 0 ; x < strlen(optarg); x++) {
1552     switch(optarg[x]) {
1553     case 'p':
1554     case 'P':
1555     do_state(optarg[x], PAGEEXEC);
1556     break;
1557     case 's':
1558     case 'S':
1559     do_state(optarg[x], SEGMEXEC);
1560     break;
1561     case 'm':
1562     case 'M':
1563     do_state(optarg[x], MPROTECT);
1564     break;
1565     case 'e':
1566     case 'E':
1567     do_state(optarg[x], EMUTRAMP);
1568     break;
1569     case 'r':
1570     case 'R':
1571     do_state(optarg[x], RANDMMAP);
1572     break;
1573     case 'x':
1574     case 'X':
1575     do_state(optarg[x], RANDEXEC);
1576     break;
1577     default:
1578     break;
1579     }
1580     }
1581     if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1582     ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1583     ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1584     ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1585     ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1586     ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1587     setpax = flags;
1588     break;
1589     }
1590 vapier 1.122 case 'g': gmatch = 1; break;
1591 vapier 1.102 case 'L': use_ldcache = 1; break;
1592 vapier 1.37 case 'y': scan_symlink = 0; break;
1593 vapier 1.105 case 'A': scan_archives = 1; break;
1594 solar 1.16 case 'B': show_banner = 0; break;
1595 vapier 1.10 case 'l': scan_ldpath = 1; break;
1596     case 'p': scan_envpath = 1; break;
1597     case 'R': dir_recurse = 1; break;
1598 vapier 1.14 case 'm': dir_crossmount = 0; break;
1599 vapier 1.101 case 'X': ++fix_elf; break;
1600 vapier 1.10 case 'x': show_pax = 1; break;
1601 solar 1.73 case 'e': show_phdr = 1; break;
1602 vapier 1.10 case 't': show_textrel = 1; break;
1603     case 'r': show_rpath = 1; break;
1604 vapier 1.32 case 'n': show_needed = 1; break;
1605 vapier 1.38 case 'i': show_interp = 1; break;
1606 vapier 1.49 case 'b': show_bind = 1; break;
1607 vapier 1.84 case 'S': show_soname = 1; break;
1608 vapier 1.76 case 'T': show_textrels = 1; break;
1609 vapier 1.10 case 'q': be_quiet = 1; break;
1610 vapier 1.14 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1611 vapier 1.82 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1612 vapier 1.10
1613     case ':':
1614 vapier 1.113 err("Option '%c' is missing parameter", optopt);
1615 vapier 1.10 case '?':
1616 solar 1.119 err("Unknown option '%c' or argument missing", optopt);
1617 vapier 1.10 default:
1618 vapier 1.113 err("Unhandled option '%c'; please report this", i);
1619 vapier 1.10 }
1620     }
1621    
1622 vapier 1.39 /* let the format option override all other options */
1623     if (out_format) {
1624 solar 1.73 show_pax = show_phdr = show_textrel = show_rpath = \
1625 vapier 1.84 show_needed = show_interp = show_bind = show_soname = \
1626     show_textrels = 0;
1627 vapier 1.48 for (i = 0; out_format[i]; ++i) {
1628 vapier 1.70 if (!IS_MODIFIER(out_format[i])) continue;
1629 vapier 1.39
1630 vapier 1.48 switch (out_format[++i]) {
1631 solar 1.132 case '+': break;
1632 vapier 1.39 case '%': break;
1633 vapier 1.70 case '#': break;
1634 vapier 1.39 case 'F': break;
1635 vapier 1.66 case 'p': break;
1636     case 'f': break;
1637 solar 1.124 case 'k': break;
1638 vapier 1.39 case 's': break;
1639 vapier 1.72 case 'N': break;
1640 vapier 1.41 case 'o': break;
1641 vapier 1.39 case 'x': show_pax = 1; break;
1642 solar 1.73 case 'e': show_phdr = 1; break;
1643 vapier 1.39 case 't': show_textrel = 1; break;
1644     case 'r': show_rpath = 1; break;
1645     case 'n': show_needed = 1; break;
1646     case 'i': show_interp = 1; break;
1647 vapier 1.49 case 'b': show_bind = 1; break;
1648 vapier 1.84 case 'S': show_soname = 1; break;
1649 vapier 1.76 case 'T': show_textrels = 1; break;
1650 vapier 1.39 default:
1651     err("Invalid format specifier '%c' (byte %i)",
1652 vapier 1.48 out_format[i], i+1);
1653 vapier 1.39 }
1654     }
1655 vapier 1.41
1656     /* construct our default format */
1657     } else {
1658     size_t fmt_len = 30;
1659     out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1660 vapier 1.76 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1661     if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1662     if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1663     if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1664     if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1665     if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1666     if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1667     if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1668 vapier 1.84 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1669 vapier 1.76 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1670     if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1671 solar 1.124 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1672 vapier 1.76 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1673     if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1674 vapier 1.39 }
1675 vapier 1.41 if (be_verbose > 2) printf("Format: %s\n", out_format);
1676 vapier 1.39
1677     /* now lets actually do the scanning */
1678 vapier 1.102 if (scan_ldpath || use_ldcache)
1679 solar 1.123 load_ld_so_conf(0, "/etc/ld.so.conf");
1680 vapier 1.10 if (scan_ldpath) scanelf_ldpath();
1681     if (scan_envpath) scanelf_envpath();
1682 solar 1.132 if (!from_file && ttyname(0) == NULL)
1683 vapier 1.133 from_file = "-";
1684 solar 1.45 if (from_file) {
1685     scanelf_from_file(from_file);
1686     from_file = *argv;
1687     }
1688     if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1689 vapier 1.25 err("Nothing to scan !?");
1690 vapier 1.66 while (optind < argc) {
1691     search_path = argv[optind++];
1692     scanelf_dir(search_path);
1693     }
1694 vapier 1.27
1695 vapier 1.39 /* clean up */
1696 vapier 1.93 if (versioned_symname) free(versioned_symname);
1697 vapier 1.48 for (i = 0; ldpaths[i]; ++i)
1698     free(ldpaths[i]);
1699 solar 1.96
1700     if (ldcache != 0)
1701     munmap(ldcache, ldcache_size);
1702 vapier 1.10 }
1703    
1704    
1705    
1706 vapier 1.41 /* utility funcs */
1707 vapier 1.60 static char *xstrdup(const char *s)
1708 vapier 1.41 {
1709     char *ret = strdup(s);
1710     if (!ret) err("Could not strdup(): %s", strerror(errno));
1711     return ret;
1712     }
1713     static void *xmalloc(size_t size)
1714     {
1715     void *ret = malloc(size);
1716     if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1717     return ret;
1718     }
1719 vapier 1.95 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1720 vapier 1.41 {
1721 vapier 1.69 size_t new_len;
1722 vapier 1.41
1723     new_len = strlen(*dst) + strlen(src);
1724     if (*curr_len <= new_len) {
1725     *curr_len = new_len + (*curr_len / 2);
1726     *dst = realloc(*dst, *curr_len);
1727     if (!*dst)
1728 vapier 1.95 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1729 vapier 1.41 }
1730    
1731 vapier 1.95 if (n)
1732     strncat(*dst, src, n);
1733     else
1734     strcat(*dst, src);
1735 vapier 1.41 }
1736     static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1737     {
1738     static char my_app[2];
1739     my_app[0] = append;
1740     my_app[1] = '\0';
1741     xstrcat(dst, my_app, curr_len);
1742     }
1743    
1744    
1745 vapier 1.72
1746 vapier 1.10 int main(int argc, char *argv[])
1747 solar 1.1 {
1748 vapier 1.10 if (argc < 2)
1749     usage(EXIT_FAILURE);
1750     parseargs(argc, argv);
1751 solar 1.21 fclose(stdout);
1752 solar 1.61 #ifdef __BOUNDS_CHECKING_ON
1753 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()");
1754 solar 1.61 #endif
1755 vapier 1.10 return EXIT_SUCCESS;
1756 solar 1.1 }

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