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Revision 1.159 - (hide annotations) (download) (as text)
Sun Oct 29 16:20:54 2006 UTC (7 years, 11 months ago) by vapier
Branch: MAIN
Changes since 1.158: +4 -3 lines
File MIME type: text/x-csrc
dont output when scanning bind info on static elfs #153286

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 1.159 * $Header: /var/cvsroot/gentoo-projects/pax-utils/scanelf.c,v 1.158 2006/08/25 06:32:08 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 flameeyes 1.141
12 vapier 1.159 static const char *rcsid = "$Id: scanelf.c,v 1.158 2006/08/25 06:32:08 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 kevquinn 1.142 static int file_matches_list(const char *filename, char **matchlist);
29 vapier 1.106 static int scanelf_elfobj(elfobj *elf);
30     static int scanelf_elf(const char *filename, int fd, size_t len);
31     static int scanelf_archive(const char *filename, int fd, size_t len);
32 vapier 1.10 static void scanelf_file(const char *filename);
33     static void scanelf_dir(const char *path);
34 vapier 1.106 static void scanelf_ldpath(void);
35     static void scanelf_envpath(void);
36 vapier 1.10 static void usage(int status);
37 kevquinn 1.142 static char **get_split_env(const char *envvar);
38     static void parseenv(void);
39 vapier 1.10 static void parseargs(int argc, char *argv[]);
40 vapier 1.60 static char *xstrdup(const char *s);
41 vapier 1.41 static void *xmalloc(size_t size);
42 kevquinn 1.142 static void *xrealloc(void *ptr, size_t size);
43 vapier 1.95 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
44     #define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
45 vapier 1.41 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
46 vapier 1.10
47     /* variables to control behavior */
48 solar 1.119 static char match_etypes[126] = "";
49 vapier 1.48 static char *ldpaths[256];
50 vapier 1.10 static char scan_ldpath = 0;
51     static char scan_envpath = 0;
52 vapier 1.37 static char scan_symlink = 1;
53 vapier 1.105 static char scan_archives = 0;
54 vapier 1.10 static char dir_recurse = 0;
55 vapier 1.14 static char dir_crossmount = 1;
56 vapier 1.10 static char show_pax = 0;
57 solar 1.73 static char show_phdr = 0;
58 vapier 1.10 static char show_textrel = 0;
59     static char show_rpath = 0;
60 vapier 1.32 static char show_needed = 0;
61 vapier 1.38 static char show_interp = 0;
62 vapier 1.49 static char show_bind = 0;
63 vapier 1.84 static char show_soname = 0;
64 vapier 1.76 static char show_textrels = 0;
65 solar 1.16 static char show_banner = 1;
66 vapier 1.10 static char be_quiet = 0;
67 vapier 1.14 static char be_verbose = 0;
68 solar 1.127 static char be_wewy_wewy_quiet = 0;
69 solar 1.132 static char be_semi_verbose = 0;
70 vapier 1.39 static char *find_sym = NULL, *versioned_symname = NULL;
71 vapier 1.72 static char *find_lib = NULL;
72 solar 1.124 static char *find_section = NULL;
73 vapier 1.39 static char *out_format = NULL;
74 vapier 1.66 static char *search_path = NULL;
75 vapier 1.101 static char fix_elf = 0;
76 solar 1.86 static char gmatch = 0;
77 vapier 1.102 static char use_ldcache = 0;
78 solar 1.1
79 kevquinn 1.142 static char **qa_textrels = NULL;
80     static char **qa_execstack = NULL;
81 kevquinn 1.145 static char **qa_wx_load = NULL;
82 kevquinn 1.142
83 solar 1.120 int match_bits = 0;
84 solar 1.96 caddr_t ldcache = 0;
85     size_t ldcache_size = 0;
86 solar 1.127 unsigned long setpax = 0UL;
87 solar 1.96
88 vapier 1.152
89    
90 vapier 1.39 /* sub-funcs for scanelf_file() */
91 vapier 1.77 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
92     {
93     /* find the best SHT_DYNSYM and SHT_STRTAB sections */
94     #define GET_SYMTABS(B) \
95     if (elf->elf_class == ELFCLASS ## B) { \
96     Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
97     /* debug sections */ \
98     symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
99     strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
100     /* runtime sections */ \
101     dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
102     dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
103     if (symtab && dynsym) { \
104     *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
105     } else { \
106     *sym = (void*)(symtab ? symtab : dynsym); \
107     } \
108     if (strtab && dynstr) { \
109     *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
110     } else { \
111     *tab = (void*)(strtab ? strtab : dynstr); \
112     } \
113     }
114     GET_SYMTABS(32)
115     GET_SYMTABS(64)
116     }
117 solar 1.127
118 vapier 1.41 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
119 solar 1.6 {
120 solar 1.61 static char ret[7];
121     unsigned long i, shown;
122    
123 vapier 1.41 if (!show_pax) return NULL;
124 vapier 1.10
125 solar 1.61 shown = 0;
126     memset(&ret, 0, sizeof(ret));
127    
128     if (elf->phdr) {
129     #define SHOW_PAX(B) \
130     if (elf->elf_class == ELFCLASS ## B) { \
131     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
132     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
133     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
134     if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
135     continue; \
136 solar 1.127 if (fix_elf && setpax) { \
137     /* set the paxctl flags */ \
138     ESET(phdr[i].p_flags, setpax); \
139     } \
140 solar 1.129 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
141 solar 1.61 continue; \
142     memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
143     *found_pax = 1; \
144     ++shown; \
145     break; \
146     } \
147     }
148     SHOW_PAX(32)
149     SHOW_PAX(64)
150     }
151    
152 solar 1.128
153     if (fix_elf && setpax) {
154     /* set the chpax settings */
155 solar 1.129 if (elf->elf_class == ELFCLASS32) {
156     if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
157     ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
158     } else {
159     if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
160     ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
161     }
162 solar 1.128 }
163    
164 solar 1.61 /* fall back to EI_PAX if no PT_PAX was found */
165     if (!*ret) {
166 vapier 1.90 static char *paxflags;
167 solar 1.61 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
168     if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
169     *found_pax = 1;
170 solar 1.127 return (be_wewy_wewy_quiet ? NULL : paxflags);
171 solar 1.61 }
172     strncpy(ret, paxflags, sizeof(ret));
173 vapier 1.14 }
174 vapier 1.41
175 solar 1.127 if (be_wewy_wewy_quiet || (be_quiet && !shown))
176 solar 1.61 return NULL;
177 vapier 1.90 else
178     return ret;
179     }
180 solar 1.61
181 solar 1.73 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
182 vapier 1.39 {
183 vapier 1.71 static char ret[12];
184 vapier 1.41 char *found;
185 vapier 1.99 unsigned long i, shown, multi_stack, multi_relro, multi_load;
186     int max_pt_load;
187 vapier 1.41
188 solar 1.73 if (!show_phdr) return NULL;
189 vapier 1.41
190 vapier 1.71 memcpy(ret, "--- --- ---\0", 12);
191    
192 vapier 1.41 shown = 0;
193 vapier 1.71 multi_stack = multi_relro = multi_load = 0;
194 vapier 1.99 max_pt_load = elf_max_pt_load(elf);
195 vapier 1.44
196 vapier 1.108 #define NOTE_GNU_STACK ".note.GNU-stack"
197 solar 1.73 #define SHOW_PHDR(B) \
198 vapier 1.39 if (elf->elf_class == ELFCLASS ## B) { \
199     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
200 vapier 1.91 Elf ## B ## _Off offset; \
201     uint32_t flags, check_flags; \
202     if (elf->phdr != NULL) { \
203     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
204     for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
205     if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
206 vapier 1.152 if (multi_stack++) \
207     warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
208     if (file_matches_list(elf->filename, qa_execstack)) \
209     continue; \
210     found = found_phdr; \
211     offset = 0; \
212     check_flags = PF_X; \
213 vapier 1.91 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
214 vapier 1.152 if (multi_relro++) \
215     warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
216 vapier 1.91 found = found_relro; \
217     offset = 4; \
218     check_flags = PF_X; \
219     } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
220 solar 1.117 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
221 vapier 1.152 if (multi_load++ > max_pt_load) \
222     warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
223     if (file_matches_list(elf->filename, qa_wx_load)) \
224     continue; \
225     found = found_load; \
226     offset = 8; \
227     check_flags = PF_W|PF_X; \
228 vapier 1.91 } else \
229     continue; \
230     flags = EGET(phdr[i].p_flags); \
231     if (be_quiet && ((flags & check_flags) != check_flags)) \
232     continue; \
233 solar 1.130 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
234 vapier 1.101 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
235     ret[3] = ret[7] = '!'; \
236     flags = EGET(phdr[i].p_flags); \
237     } \
238 vapier 1.91 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
239     *found = 1; \
240     ++shown; \
241     } \
242     } else if (elf->shdr != NULL) { \
243     /* no program headers which means this is prob an object file */ \
244     Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
245     Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
246 vapier 1.108 char *str; \
247 vapier 1.118 if ((void*)strtbl > (void*)elf->data_end) \
248 vapier 1.108 goto skip_this_shdr##B; \
249 vapier 1.91 check_flags = SHF_WRITE|SHF_EXECINSTR; \
250     for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
251     if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
252     offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
253 vapier 1.108 str = elf->data + offset; \
254     if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
255     if (!strcmp(str, NOTE_GNU_STACK)) { \
256 vapier 1.91 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
257     flags = EGET(shdr[i].sh_flags); \
258     if (be_quiet && ((flags & check_flags) != check_flags)) \
259     continue; \
260     ++*found_phdr; \
261     shown = 1; \
262     if (flags & SHF_WRITE) ret[0] = 'W'; \
263     if (flags & SHF_ALLOC) ret[1] = 'A'; \
264     if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
265     if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
266     break; \
267     } \
268     } \
269 vapier 1.108 skip_this_shdr##B: \
270 vapier 1.91 if (!multi_stack) { \
271 vapier 1.158 if (file_matches_list(elf->filename, qa_execstack)) \
272     return NULL; \
273 vapier 1.91 *found_phdr = 1; \
274     shown = 1; \
275     memcpy(ret, "!WX", 3); \
276     } \
277 vapier 1.39 } \
278     }
279 solar 1.73 SHOW_PHDR(32)
280     SHOW_PHDR(64)
281 vapier 1.44
282 solar 1.127 if (be_wewy_wewy_quiet || (be_quiet && !shown))
283 vapier 1.41 return NULL;
284     else
285     return ret;
286 vapier 1.39 }
287 kevquinn 1.142
288 vapier 1.90 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
289 vapier 1.39 {
290 vapier 1.90 static const char *ret = "TEXTREL";
291 vapier 1.44 unsigned long i;
292 vapier 1.41
293 vapier 1.79 if (!show_textrel && !show_textrels) return NULL;
294 vapier 1.41
295 kevquinn 1.142 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
296    
297 vapier 1.44 if (elf->phdr) {
298 vapier 1.39 #define SHOW_TEXTREL(B) \
299     if (elf->elf_class == ELFCLASS ## B) { \
300     Elf ## B ## _Dyn *dyn; \
301     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
302     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
303 vapier 1.44 Elf ## B ## _Off offset; \
304 vapier 1.39 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
305 vapier 1.59 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
306 vapier 1.44 offset = EGET(phdr[i].p_offset); \
307     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
308     dyn = DYN ## B (elf->data + offset); \
309 vapier 1.39 while (EGET(dyn->d_tag) != DT_NULL) { \
310     if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
311     *found_textrel = 1; \
312     /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
313 solar 1.127 return (be_wewy_wewy_quiet ? NULL : ret); \
314 vapier 1.39 } \
315     ++dyn; \
316 vapier 1.26 } \
317 vapier 1.39 } }
318     SHOW_TEXTREL(32)
319     SHOW_TEXTREL(64)
320 vapier 1.44 }
321    
322 solar 1.127 if (be_quiet || be_wewy_wewy_quiet)
323 vapier 1.41 return NULL;
324     else
325 vapier 1.90 return " - ";
326 vapier 1.39 }
327 vapier 1.79 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
328 vapier 1.76 {
329 vapier 1.82 unsigned long s, r, rmax;
330     void *symtab_void, *strtab_void, *text_void;
331 vapier 1.76
332     if (!show_textrels) return NULL;
333    
334 vapier 1.79 /* don't search for TEXTREL's if the ELF doesn't have any */
335     if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
336     if (!*found_textrel) return NULL;
337    
338 vapier 1.77 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
339 vapier 1.82 text_void = elf_findsecbyname(elf, ".text");
340 vapier 1.76
341 vapier 1.82 if (symtab_void && strtab_void && text_void && elf->shdr) {
342 vapier 1.76 #define SHOW_TEXTRELS(B) \
343     if (elf->elf_class == ELFCLASS ## B) { \
344     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
345     Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
346     Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
347     Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
348 vapier 1.82 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
349     Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
350     uint ## B ## _t memsz = EGET(text->sh_size); \
351 vapier 1.76 Elf ## B ## _Rel *rel; \
352     Elf ## B ## _Rela *rela; \
353     /* search the section headers for relocations */ \
354     for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
355     uint32_t sh_type = EGET(shdr[s].sh_type); \
356     if (sh_type == SHT_REL) { \
357     rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
358     rela = NULL; \
359     rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
360     } else if (sh_type == SHT_RELA) { \
361     rel = NULL; \
362     rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
363     rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
364     } else \
365     continue; \
366 vapier 1.82 /* now see if any of the relocs are in the .text */ \
367     for (r = 0; r < rmax; ++r) { \
368     unsigned long sym_max; \
369     Elf ## B ## _Addr offset_tmp; \
370     Elf ## B ## _Sym *func; \
371     Elf ## B ## _Sym *sym; \
372     Elf ## B ## _Addr r_offset; \
373     uint ## B ## _t r_info; \
374     if (sh_type == SHT_REL) { \
375     r_offset = EGET(rel[r].r_offset); \
376     r_info = EGET(rel[r].r_info); \
377     } else { \
378     r_offset = EGET(rela[r].r_offset); \
379     r_info = EGET(rela[r].r_info); \
380     } \
381     /* make sure this relocation is inside of the .text */ \
382     if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
383     if (be_verbose <= 2) continue; \
384     } else \
385 vapier 1.78 *found_textrels = 1; \
386 vapier 1.82 /* locate this relocation symbol name */ \
387     sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
388 vapier 1.112 if ((void*)sym > (void*)elf->data_end) { \
389 vapier 1.111 warn("%s: corrupt ELF symbol", elf->filename); \
390 vapier 1.109 continue; \
391     } \
392 vapier 1.82 sym_max = ELF ## B ## _R_SYM(r_info); \
393     if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
394     sym += sym_max; \
395     else \
396     sym = NULL; \
397     sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
398     /* show the raw details about this reloc */ \
399 vapier 1.88 printf(" %s: ", elf->base_filename); \
400 vapier 1.82 if (sym && sym->st_name) \
401     printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
402     else \
403 vapier 1.88 printf("(memory/fake?)"); \
404 vapier 1.82 printf(" [0x%lX]", (unsigned long)r_offset); \
405     /* now try to find the closest symbol that this rel is probably in */ \
406     sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
407     func = NULL; \
408     offset_tmp = 0; \
409     while (sym_max--) { \
410     if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
411     func = sym; \
412     offset_tmp = EGET(sym->st_value); \
413 vapier 1.76 } \
414 vapier 1.82 ++sym; \
415 vapier 1.76 } \
416 vapier 1.82 printf(" in "); \
417     if (func && func->st_name) \
418     printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
419     else \
420     printf("(NULL: fake?)"); \
421     printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
422 vapier 1.76 } \
423     } }
424     SHOW_TEXTRELS(32)
425     SHOW_TEXTRELS(64)
426     }
427 vapier 1.82 if (!*found_textrels)
428     warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
429 vapier 1.76
430     return NULL;
431     }
432 solar 1.83
433 vapier 1.102 static void rpath_security_checks(elfobj *, char *, const char *);
434     static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
435 vapier 1.100 {
436 solar 1.83 struct stat st;
437 vapier 1.84 switch (*item) {
438 vapier 1.89 case '/': break;
439     case '.':
440 vapier 1.102 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
441 vapier 1.89 break;
442 vapier 1.100 case ':':
443 vapier 1.89 case '\0':
444 vapier 1.102 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
445 solar 1.83 break;
446     case '$':
447 vapier 1.84 if (fstat(elf->fd, &st) != -1)
448 solar 1.83 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
449 vapier 1.157 warnf("Security problem with %s='%s' in %s with mode set of %o",
450 vapier 1.102 dt_type, item, elf->filename, st.st_mode & 07777);
451 solar 1.83 break;
452     default:
453 vapier 1.102 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
454 solar 1.83 break;
455     }
456     }
457 vapier 1.41 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
458 vapier 1.39 {
459 vapier 1.48 unsigned long i, s;
460     char *rpath, *runpath, **r;
461 vapier 1.39 void *strtbl_void;
462 vapier 1.10
463 vapier 1.39 if (!show_rpath) return;
464 vapier 1.10
465 vapier 1.39 strtbl_void = elf_findsecbyname(elf, ".dynstr");
466     rpath = runpath = NULL;
467 vapier 1.10
468 vapier 1.44 if (elf->phdr && strtbl_void) {
469 vapier 1.26 #define SHOW_RPATH(B) \
470     if (elf->elf_class == ELFCLASS ## B) { \
471     Elf ## B ## _Dyn *dyn; \
472     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
473     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
474     Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
475 vapier 1.44 Elf ## B ## _Off offset; \
476 vapier 1.60 Elf ## B ## _Xword word; \
477 vapier 1.48 /* Scan all the program headers */ \
478 vapier 1.26 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
479 vapier 1.48 /* Just scan dynamic headers */ \
480 vapier 1.26 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
481 vapier 1.44 offset = EGET(phdr[i].p_offset); \
482     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
483 vapier 1.48 /* Just scan dynamic RPATH/RUNPATH headers */ \
484 vapier 1.44 dyn = DYN ## B (elf->data + offset); \
485 vapier 1.48 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
486     if (word == DT_RPATH) { \
487     r = &rpath; \
488     } else if (word == DT_RUNPATH) { \
489     r = &runpath; \
490     } else { \
491     ++dyn; \
492     continue; \
493     } \
494     /* Verify the memory is somewhat sane */ \
495     offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
496 vapier 1.69 if (offset < (Elf ## B ## _Off)elf->len) { \
497 vapier 1.48 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
498     *r = (char*)(elf->data + offset); \
499 vapier 1.103 /* cache the length in case we need to nuke this section later on */ \
500     if (fix_elf) \
501     offset = strlen(*r); \
502 vapier 1.48 /* If quiet, don't output paths in ld.so.conf */ \
503 vapier 1.69 if (be_quiet) { \
504     size_t len; \
505     char *start, *end; \
506 vapier 1.75 /* note that we only 'chop' off leading known paths. */ \
507     /* since *r is read-only memory, we can only move the ptr forward. */ \
508     start = *r; \
509     /* scan each path in : delimited list */ \
510     while (start) { \
511 vapier 1.102 rpath_security_checks(elf, start, get_elfdtype(word)); \
512 vapier 1.69 end = strchr(start, ':'); \
513 vapier 1.75 len = (end ? abs(end - start) : strlen(start)); \
514 vapier 1.102 if (use_ldcache) \
515     for (s = 0; ldpaths[s]; ++s) \
516     if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
517     *r = end; \
518     /* corner case ... if RPATH reads "/usr/lib:", we want \
519     * to show ':' rather than '' */ \
520     if (end && end[1] != '\0') \
521     (*r)++; \
522     break; \
523     } \
524 vapier 1.100 if (!*r || !end) \
525     break; \
526 vapier 1.75 else \
527     start = start + len + 1; \
528 vapier 1.69 } \
529     } \
530 vapier 1.101 if (*r) { \
531 solar 1.107 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
532 vapier 1.101 /* just nuke it */ \
533     nuke_it##B: \
534 vapier 1.103 memset(*r, 0x00, offset); \
535 vapier 1.102 *r = NULL; \
536 vapier 1.101 ESET(dyn->d_tag, DT_DEBUG); \
537 vapier 1.103 ESET(dyn->d_un.d_ptr, 0); \
538 vapier 1.101 } else if (fix_elf) { \
539     /* try to clean "bad" paths */ \
540     size_t len, tmpdir_len; \
541     char *start, *end; \
542     const char *tmpdir; \
543     start = *r; \
544     tmpdir = (getenv("TMPDIR") ? : "."); \
545     tmpdir_len = strlen(tmpdir); \
546     while (1) { \
547     end = strchr(start, ':'); \
548     if (start == end) { \
549     eat_this_path##B: \
550     len = strlen(end); \
551     memmove(start, end+1, len); \
552     start[len-1] = '\0'; \
553     end = start - 1; \
554     } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
555     if (!end) { \
556     if (start == *r) \
557     goto nuke_it##B; \
558     *--start = '\0'; \
559     } else \
560     goto eat_this_path##B; \
561     } \
562     if (!end) \
563     break; \
564     start = end + 1; \
565     } \
566 vapier 1.102 if (**r == '\0') \
567     goto nuke_it##B; \
568 vapier 1.101 } \
569 vapier 1.102 if (*r) \
570     *found_rpath = 1; \
571 vapier 1.101 } \
572 vapier 1.26 } \
573     ++dyn; \
574     } \
575     } }
576     SHOW_RPATH(32)
577     SHOW_RPATH(64)
578 vapier 1.10 }
579 vapier 1.41
580 solar 1.127 if (be_wewy_wewy_quiet) return;
581 vapier 1.70
582 vapier 1.39 if (rpath && runpath) {
583 vapier 1.41 if (!strcmp(rpath, runpath)) {
584     xstrcat(ret, runpath, ret_len);
585     } else {
586 vapier 1.39 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
587 vapier 1.41 xchrcat(ret, '{', ret_len);
588     xstrcat(ret, rpath, ret_len);
589     xchrcat(ret, ',', ret_len);
590     xstrcat(ret, runpath, ret_len);
591     xchrcat(ret, '}', ret_len);
592 vapier 1.39 }
593     } else if (rpath || runpath)
594 vapier 1.41 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
595     else if (!be_quiet)
596     xstrcat(ret, " - ", ret_len);
597 vapier 1.39 }
598 solar 1.96
599     #define LDSO_CACHE_MAGIC "ld.so-"
600     #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
601     #define LDSO_CACHE_VER "1.7.0"
602     #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
603 vapier 1.97 #define FLAG_ANY -1
604     #define FLAG_TYPE_MASK 0x00ff
605     #define FLAG_LIBC4 0x0000
606     #define FLAG_ELF 0x0001
607     #define FLAG_ELF_LIBC5 0x0002
608     #define FLAG_ELF_LIBC6 0x0003
609     #define FLAG_REQUIRED_MASK 0xff00
610     #define FLAG_SPARC_LIB64 0x0100
611     #define FLAG_IA64_LIB64 0x0200
612     #define FLAG_X8664_LIB64 0x0300
613     #define FLAG_S390_LIB64 0x0400
614     #define FLAG_POWERPC_LIB64 0x0500
615     #define FLAG_MIPS64_LIBN32 0x0600
616     #define FLAG_MIPS64_LIBN64 0x0700
617 solar 1.96
618 vapier 1.97 static char *lookup_cache_lib(elfobj *, char *);
619 vapier 1.148
620 flameeyes 1.141 #if defined(__GLIBC__) || defined(__UCLIBC__)
621 vapier 1.148
622 vapier 1.97 static char *lookup_cache_lib(elfobj *elf, char *fname)
623 solar 1.96 {
624     int fd = 0;
625     char *strs;
626 vapier 1.104 static char buf[__PAX_UTILS_PATH_MAX] = "";
627 solar 1.96 const char *cachefile = "/etc/ld.so.cache";
628     struct stat st;
629    
630     typedef struct {
631     char magic[LDSO_CACHE_MAGIC_LEN];
632     char version[LDSO_CACHE_VER_LEN];
633     int nlibs;
634     } header_t;
635 vapier 1.97 header_t *header;
636 solar 1.96
637     typedef struct {
638     int flags;
639     int sooffset;
640     int liboffset;
641     } libentry_t;
642     libentry_t *libent;
643    
644     if (fname == NULL)
645     return NULL;
646    
647     if (ldcache == 0) {
648 vapier 1.97 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
649 solar 1.96 return NULL;
650 vapier 1.97
651     /* cache these values so we only map/unmap the cache file once */
652 solar 1.96 ldcache_size = st.st_size;
653 vapier 1.97 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
654    
655     close(fd);
656 solar 1.96
657 solar 1.116 if (ldcache == (caddr_t)-1) {
658     ldcache = 0;
659 solar 1.96 return NULL;
660 solar 1.116 }
661 solar 1.96
662     if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
663     return NULL;
664     if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
665     return NULL;
666     }
667    
668     header = (header_t *) ldcache;
669     libent = (libentry_t *) (ldcache + sizeof(header_t));
670     strs = (char *) &libent[header->nlibs];
671    
672     for (fd = 0; fd < header->nlibs; fd++) {
673 vapier 1.97 /* this should be more fine grained, but for now we assume that
674     * diff arches will not be cached together. and we ignore the
675     * the different multilib mips cases. */
676     if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
677     continue;
678     if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
679     continue;
680    
681 solar 1.96 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
682     continue;
683     strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
684     }
685     return buf;
686     }
687 solar 1.154 #elif defined(__NetBSD__)
688     static char *lookup_cache_lib(elfobj *elf, char *fname)
689     {
690     static char buf[__PAX_UTILS_PATH_MAX] = "";
691     static struct stat st;
692    
693     char **ldpath;
694     for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
695     if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
696     continue; /* if the pathname is too long, or something went wrong, ignore */
697    
698     if (stat(buf, &st) != 0)
699     continue; /* if the lib doesn't exist in *ldpath, look further */
700    
701     /* NetBSD doesn't actually do sanity checks, it just loads the file
702     * and if that doesn't work, continues looking in other directories.
703     * This cannot easily be safely emulated, unfortunately. For now,
704     * just assume that if it exists, it's a valid library. */
705 vapier 1.148
706 solar 1.154 return buf;
707     }
708    
709     /* not found in any path */
710     return NULL;
711     }
712 flameeyes 1.141 #else
713 vapier 1.148 #warning Cache support not implemented for your target
714 flameeyes 1.141 static char *lookup_cache_lib(elfobj *elf, char *fname)
715     {
716     return NULL;
717     }
718     #endif
719 solar 1.96
720 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)
721 vapier 1.39 {
722 vapier 1.44 unsigned long i;
723 vapier 1.39 char *needed;
724     void *strtbl_void;
725 solar 1.96 char *p;
726 vapier 1.39
727 vapier 1.72 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
728 vapier 1.10
729 vapier 1.39 strtbl_void = elf_findsecbyname(elf, ".dynstr");
730 vapier 1.32
731 vapier 1.44 if (elf->phdr && strtbl_void) {
732 vapier 1.32 #define SHOW_NEEDED(B) \
733     if (elf->elf_class == ELFCLASS ## B) { \
734     Elf ## B ## _Dyn *dyn; \
735     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
736     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
737     Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
738 vapier 1.44 Elf ## B ## _Off offset; \
739 vapier 1.32 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
740     if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
741 vapier 1.44 offset = EGET(phdr[i].p_offset); \
742     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
743     dyn = DYN ## B (elf->data + offset); \
744 vapier 1.32 while (EGET(dyn->d_tag) != DT_NULL) { \
745     if (EGET(dyn->d_tag) == DT_NEEDED) { \
746 vapier 1.44 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
747 vapier 1.69 if (offset >= (Elf ## B ## _Off)elf->len) { \
748 vapier 1.49 ++dyn; \
749     continue; \
750     } \
751 vapier 1.44 needed = (char*)(elf->data + offset); \
752 vapier 1.72 if (op == 0) { \
753 solar 1.127 if (!be_wewy_wewy_quiet) { \
754 vapier 1.72 if (*found_needed) xchrcat(ret, ',', ret_len); \
755 vapier 1.102 if (use_ldcache) \
756 vapier 1.97 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
757 solar 1.96 needed = p; \
758 vapier 1.72 xstrcat(ret, needed, ret_len); \
759     } \
760     *found_needed = 1; \
761     } else { \
762 solar 1.86 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
763 vapier 1.81 *found_lib = 1; \
764 solar 1.127 return (be_wewy_wewy_quiet ? NULL : needed); \
765 vapier 1.81 } \
766 vapier 1.72 } \
767 vapier 1.32 } \
768     ++dyn; \
769     } \
770     } }
771     SHOW_NEEDED(32)
772     SHOW_NEEDED(64)
773 vapier 1.85 if (op == 0 && !*found_needed && be_verbose)
774 vapier 1.84 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
775 vapier 1.32 }
776 vapier 1.72
777     return NULL;
778 vapier 1.39 }
779 vapier 1.41 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
780 vapier 1.39 {
781     void *strtbl_void;
782    
783 vapier 1.41 if (!show_interp) return NULL;
784 vapier 1.32
785 vapier 1.39 strtbl_void = elf_findsecbyname(elf, ".interp");
786 vapier 1.38
787 vapier 1.39 if (strtbl_void) {
788 vapier 1.38 #define SHOW_INTERP(B) \
789     if (elf->elf_class == ELFCLASS ## B) { \
790 solar 1.40 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
791     *found_interp = 1; \
792 solar 1.127 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
793 vapier 1.38 }
794     SHOW_INTERP(32)
795     SHOW_INTERP(64)
796     }
797 vapier 1.41 return NULL;
798 vapier 1.39 }
799 vapier 1.49 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
800     {
801     unsigned long i;
802     struct stat s;
803 solar 1.131 char dynamic = 0;
804 vapier 1.49
805     if (!show_bind) return NULL;
806 vapier 1.51 if (!elf->phdr) return NULL;
807 vapier 1.49
808     #define SHOW_BIND(B) \
809     if (elf->elf_class == ELFCLASS ## B) { \
810     Elf ## B ## _Dyn *dyn; \
811     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
812     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
813     Elf ## B ## _Off offset; \
814     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
815     if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
816 solar 1.131 dynamic = 1; \
817 vapier 1.49 offset = EGET(phdr[i].p_offset); \
818     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
819     dyn = DYN ## B (elf->data + offset); \
820     while (EGET(dyn->d_tag) != DT_NULL) { \
821     if (EGET(dyn->d_tag) == DT_BIND_NOW || \
822     (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
823     { \
824     if (be_quiet) return NULL; \
825     *found_bind = 1; \
826 solar 1.127 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
827 vapier 1.49 } \
828     ++dyn; \
829     } \
830     } \
831     }
832     SHOW_BIND(32)
833     SHOW_BIND(64)
834    
835 solar 1.127 if (be_wewy_wewy_quiet) return NULL;
836 vapier 1.70
837 vapier 1.159 /* don't output anything if quiet mode and the ELF is static or not setuid */
838     if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
839 vapier 1.49 return NULL;
840     } else {
841     *found_bind = 1;
842 solar 1.131 return (char *) (dynamic ? "LAZY" : "STATIC");
843 vapier 1.49 }
844     }
845 vapier 1.84 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
846     {
847     unsigned long i;
848     char *soname;
849     void *strtbl_void;
850    
851     if (!show_soname) return NULL;
852    
853     strtbl_void = elf_findsecbyname(elf, ".dynstr");
854    
855     if (elf->phdr && strtbl_void) {
856     #define SHOW_SONAME(B) \
857     if (elf->elf_class == ELFCLASS ## B) { \
858     Elf ## B ## _Dyn *dyn; \
859     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
860     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
861     Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
862     Elf ## B ## _Off offset; \
863     /* only look for soname in shared objects */ \
864     if (ehdr->e_type != ET_DYN) \
865     return NULL; \
866     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
867     if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
868     offset = EGET(phdr[i].p_offset); \
869     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
870     dyn = DYN ## B (elf->data + offset); \
871     while (EGET(dyn->d_tag) != DT_NULL) { \
872     if (EGET(dyn->d_tag) == DT_SONAME) { \
873     offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
874     if (offset >= (Elf ## B ## _Off)elf->len) { \
875     ++dyn; \
876     continue; \
877     } \
878     soname = (char*)(elf->data + offset); \
879     *found_soname = 1; \
880 solar 1.127 return (be_wewy_wewy_quiet ? NULL : soname); \
881 vapier 1.84 } \
882     ++dyn; \
883     } \
884     } }
885     SHOW_SONAME(32)
886     SHOW_SONAME(64)
887     }
888    
889     return NULL;
890     }
891 vapier 1.72 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
892 vapier 1.39 {
893 vapier 1.44 unsigned long i;
894 vapier 1.95 char *ret;
895 vapier 1.39 void *symtab_void, *strtab_void;
896 vapier 1.38
897 vapier 1.41 if (!find_sym) return NULL;
898 vapier 1.95 ret = find_sym;
899 vapier 1.32
900 vapier 1.77 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
901 vapier 1.27
902 vapier 1.39 if (symtab_void && strtab_void) {
903 vapier 1.27 #define FIND_SYM(B) \
904     if (elf->elf_class == ELFCLASS ## B) { \
905     Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
906     Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
907     Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
908 vapier 1.115 unsigned long cnt = EGET(symtab->sh_entsize); \
909 vapier 1.27 char *symname; \
910 vapier 1.115 if (cnt) \
911     cnt = EGET(symtab->sh_size) / cnt; \
912 vapier 1.27 for (i = 0; i < cnt; ++i) { \
913     if (sym->st_name) { \
914 vapier 1.134 /* make sure the symbol name is in acceptable memory range */ \
915 vapier 1.27 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
916 vapier 1.115 if ((void*)symname > (void*)elf->data_end) { \
917     warnf("%s: corrupt ELF symbols", elf->filename); \
918 vapier 1.134 ++sym; \
919 vapier 1.111 continue; \
920     } \
921 vapier 1.134 /* debug display ... show all symbols and some extra info */ \
922     if (*ret == '*') { \
923 vapier 1.32 printf("%s(%s) %5lX %15s %s\n", \
924 vapier 1.39 ((*found_sym == 0) ? "\n\t" : "\t"), \
925 vapier 1.76 elf->base_filename, \
926 vapier 1.94 (unsigned long)sym->st_size, \
927 vapier 1.95 get_elfstttype(sym->st_info), \
928 vapier 1.32 symname); \
929 vapier 1.39 *found_sym = 1; \
930 vapier 1.95 } else { \
931 vapier 1.134 /* allow the user to specify a comma delimited list of symbols to search for */ \
932 vapier 1.156 char *this_sym, *this_sym_ver, *next_sym; \
933 vapier 1.134 this_sym = ret; \
934 vapier 1.156 this_sym_ver = versioned_symname; \
935 vapier 1.95 do { \
936     next_sym = strchr(this_sym, ','); \
937     if (next_sym == NULL) \
938     next_sym = this_sym + strlen(this_sym); \
939 vapier 1.134 /* do we want a defined symbol ? */ \
940     if (*this_sym == '+') { \
941 vapier 1.140 if (sym->st_shndx == SHN_UNDEF) \
942 vapier 1.134 goto skip_this_sym##B; \
943     ++this_sym; \
944 vapier 1.156 ++this_sym_ver; \
945 vapier 1.134 /* do we want an undefined symbol ? */ \
946     } else if (*this_sym == '-') { \
947 vapier 1.140 if (sym->st_shndx != SHN_UNDEF) \
948 vapier 1.134 goto skip_this_sym##B; \
949     ++this_sym; \
950 vapier 1.156 ++this_sym_ver; \
951 vapier 1.134 } \
952     /* ok, lets compare the name now */ \
953 vapier 1.95 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
954 vapier 1.156 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
955 solar 1.132 if (be_semi_verbose) { \
956     char buf[126]; \
957     snprintf(buf, sizeof(buf), "%lX %s %s", \
958     (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
959     ret = buf; \
960     } else \
961     ret = this_sym; \
962 vapier 1.95 (*found_sym)++; \
963     goto break_out; \
964     } \
965 vapier 1.134 skip_this_sym##B: this_sym = next_sym + 1; \
966 vapier 1.95 } while (*next_sym != '\0'); \
967     } \
968 vapier 1.27 } \
969     ++sym; \
970     } }
971     FIND_SYM(32)
972     FIND_SYM(64)
973 vapier 1.39 }
974 vapier 1.70
975 vapier 1.95 break_out:
976 solar 1.127 if (be_wewy_wewy_quiet) return NULL;
977 vapier 1.70
978 vapier 1.41 if (*find_sym != '*' && *found_sym)
979 vapier 1.95 return ret;
980 vapier 1.41 if (be_quiet)
981     return NULL;
982     else
983 solar 1.68 return (char *)" - ";
984 vapier 1.39 }
985 solar 1.119
986    
987 solar 1.124 static char *scanelf_file_sections(elfobj *elf, char *found_section)
988     {
989     if (!find_section)
990     return NULL;
991    
992     #define FIND_SECTION(B) \
993     if (elf->elf_class == ELFCLASS ## B) { \
994 solar 1.136 int invert; \
995 solar 1.124 Elf ## B ## _Shdr *section; \
996 solar 1.136 invert = (*find_section == '!' ? 1 : 0); \
997     section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
998     if ((section == NULL && invert) || (section != NULL && !invert)) \
999 solar 1.124 *found_section = 1; \
1000     }
1001     FIND_SECTION(32)
1002     FIND_SECTION(64)
1003    
1004 vapier 1.138 if (be_wewy_wewy_quiet)
1005     return NULL;
1006 solar 1.124
1007     if (*found_section)
1008     return find_section;
1009    
1010     if (be_quiet)
1011     return NULL;
1012     else
1013     return (char *)" - ";
1014     }
1015    
1016 vapier 1.39 /* scan an elf file and show all the fun stuff */
1017 solar 1.57 #define prints(str) write(fileno(stdout), str, strlen(str))
1018 vapier 1.106 static int scanelf_elfobj(elfobj *elf)
1019 vapier 1.39 {
1020 vapier 1.44 unsigned long i;
1021 solar 1.73 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1022 vapier 1.84 found_rpath, found_needed, found_interp, found_bind, found_soname,
1023 solar 1.124 found_sym, found_lib, found_file, found_textrels, found_section;
1024 vapier 1.41 static char *out_buffer = NULL;
1025     static size_t out_len;
1026 vapier 1.39
1027 vapier 1.76 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1028 vapier 1.84 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1029 solar 1.124 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1030 vapier 1.39
1031 vapier 1.114 if (be_verbose > 2)
1032 vapier 1.106 printf("%s: scanning file {%s,%s}\n", elf->filename,
1033 vapier 1.69 get_elfeitype(EI_CLASS, elf->elf_class),
1034     get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1035 vapier 1.114 else if (be_verbose > 1)
1036 vapier 1.106 printf("%s: scanning file\n", elf->filename);
1037 vapier 1.39
1038 vapier 1.41 /* init output buffer */
1039     if (!out_buffer) {
1040     out_len = sizeof(char) * 80;
1041     out_buffer = (char*)xmalloc(out_len);
1042     }
1043     *out_buffer = '\0';
1044    
1045 vapier 1.39 /* show the header */
1046     if (!be_quiet && show_banner) {
1047 vapier 1.49 for (i = 0; out_format[i]; ++i) {
1048 vapier 1.70 if (!IS_MODIFIER(out_format[i])) continue;
1049 vapier 1.41
1050     switch (out_format[++i]) {
1051 solar 1.132 case '+': break;
1052 vapier 1.41 case '%': break;
1053 vapier 1.70 case '#': break;
1054 vapier 1.66 case 'F':
1055     case 'p':
1056     case 'f': prints("FILE "); found_file = 1; break;
1057 vapier 1.41 case 'o': prints(" TYPE "); break;
1058     case 'x': prints(" PAX "); break;
1059 vapier 1.71 case 'e': prints("STK/REL/PTL "); break;
1060 vapier 1.41 case 't': prints("TEXTREL "); break;
1061     case 'r': prints("RPATH "); break;
1062     case 'n': prints("NEEDED "); break;
1063     case 'i': prints("INTERP "); break;
1064 vapier 1.49 case 'b': prints("BIND "); break;
1065 vapier 1.84 case 'S': prints("SONAME "); break;
1066 vapier 1.41 case 's': prints("SYM "); break;
1067 vapier 1.72 case 'N': prints("LIB "); break;
1068 vapier 1.76 case 'T': prints("TEXTRELS "); break;
1069 vapier 1.126 case 'k': prints("SECTION "); break;
1070 vapier 1.76 default: warnf("'%c' has no title ?", out_format[i]);
1071 vapier 1.39 }
1072 vapier 1.27 }
1073 vapier 1.49 if (!found_file) prints("FILE ");
1074 vapier 1.41 prints("\n");
1075 vapier 1.49 found_file = 0;
1076 vapier 1.39 show_banner = 0;
1077     }
1078    
1079     /* dump all the good stuff */
1080 vapier 1.49 for (i = 0; out_format[i]; ++i) {
1081 vapier 1.41 const char *out;
1082 vapier 1.66 const char *tmp;
1083 vapier 1.41
1084 vapier 1.70 if (!IS_MODIFIER(out_format[i])) {
1085 vapier 1.41 xchrcat(&out_buffer, out_format[i], &out_len);
1086     continue;
1087     }
1088 vapier 1.39
1089 vapier 1.41 out = NULL;
1090 solar 1.127 be_wewy_wewy_quiet = (out_format[i] == '#');
1091 solar 1.132 be_semi_verbose = (out_format[i] == '+');
1092 vapier 1.41 switch (out_format[++i]) {
1093 solar 1.132 case '+':
1094 vapier 1.70 case '%':
1095     case '#':
1096     xchrcat(&out_buffer, out_format[i], &out_len); break;
1097     case 'F':
1098 vapier 1.76 found_file = 1;
1099 solar 1.127 if (be_wewy_wewy_quiet) break;
1100 vapier 1.106 xstrcat(&out_buffer, elf->filename, &out_len);
1101 vapier 1.70 break;
1102 vapier 1.66 case 'p':
1103 vapier 1.76 found_file = 1;
1104 solar 1.127 if (be_wewy_wewy_quiet) break;
1105 vapier 1.106 tmp = elf->filename;
1106 vapier 1.66 if (search_path) {
1107     ssize_t len_search = strlen(search_path);
1108 vapier 1.106 ssize_t len_file = strlen(elf->filename);
1109     if (!strncmp(elf->filename, search_path, len_search) && \
1110 vapier 1.66 len_file > len_search)
1111     tmp += len_search;
1112     if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1113     }
1114     xstrcat(&out_buffer, tmp, &out_len);
1115     break;
1116     case 'f':
1117 vapier 1.76 found_file = 1;
1118 solar 1.127 if (be_wewy_wewy_quiet) break;
1119 vapier 1.106 tmp = strrchr(elf->filename, '/');
1120     tmp = (tmp == NULL ? elf->filename : tmp+1);
1121 vapier 1.66 xstrcat(&out_buffer, tmp, &out_len);
1122     break;
1123 vapier 1.41 case 'o': out = get_elfetype(elf); break;
1124     case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1125 solar 1.73 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1126 vapier 1.41 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1127 vapier 1.79 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1128 vapier 1.41 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1129 vapier 1.72 case 'n':
1130     case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1131 vapier 1.41 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1132 vapier 1.49 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1133 vapier 1.84 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1134 vapier 1.72 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1135 solar 1.124 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1136 vapier 1.76 default: warnf("'%c' has no scan code?", out_format[i]);
1137 vapier 1.29 }
1138 vapier 1.95 if (out) {
1139     /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1140     if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1141     xstrncat(&out_buffer, out, &out_len, (tmp-out));
1142     else
1143     xstrcat(&out_buffer, out, &out_len);
1144     }
1145 vapier 1.39 }
1146    
1147 vapier 1.54 #define FOUND_SOMETHING() \
1148 solar 1.73 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1149 vapier 1.76 found_rpath || found_needed || found_interp || found_bind || \
1150 solar 1.124 found_soname || found_sym || found_lib || found_textrels || found_section )
1151 vapier 1.54
1152     if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1153     xchrcat(&out_buffer, ' ', &out_len);
1154 vapier 1.106 xstrcat(&out_buffer, elf->filename, &out_len);
1155 vapier 1.27 }
1156 vapier 1.79 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1157 vapier 1.41 puts(out_buffer);
1158 vapier 1.79 fflush(stdout);
1159     }
1160 vapier 1.10
1161 vapier 1.105 return 0;
1162     }
1163    
1164 vapier 1.106 /* scan a single elf */
1165     static int scanelf_elf(const char *filename, int fd, size_t len)
1166     {
1167 solar 1.120 int ret = 1;
1168 vapier 1.106 elfobj *elf;
1169    
1170     /* verify this is real ELF */
1171     if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1172     if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1173 solar 1.120 return ret;
1174     }
1175     switch (match_bits) {
1176     case 32:
1177     if (elf->elf_class != ELFCLASS32)
1178     goto label_done;
1179     break;
1180     case 64:
1181     if (elf->elf_class != ELFCLASS64)
1182     goto label_done;
1183     break;
1184     default: break;
1185 vapier 1.106 }
1186 solar 1.119 if (strlen(match_etypes)) {
1187     char sbuf[126];
1188     strncpy(sbuf, match_etypes, sizeof(sbuf));
1189     if (strchr(match_etypes, ',') != NULL) {
1190     char *p;
1191     while((p = strrchr(sbuf, ',')) != NULL) {
1192     *p = 0;
1193 solar 1.129 if (etype_lookup(p+1) == get_etype(elf))
1194 solar 1.119 goto label_ret;
1195     }
1196     }
1197 solar 1.129 if (etype_lookup(sbuf) != get_etype(elf))
1198 solar 1.119 goto label_done;
1199     }
1200    
1201     label_ret:
1202 vapier 1.106 ret = scanelf_elfobj(elf);
1203 solar 1.119
1204     label_done:
1205 vapier 1.106 unreadelf(elf);
1206     return ret;
1207     }
1208 solar 1.119
1209 vapier 1.105 /* scan an archive of elfs */
1210 vapier 1.106 static int scanelf_archive(const char *filename, int fd, size_t len)
1211 vapier 1.105 {
1212 vapier 1.106 archive_handle *ar;
1213 vapier 1.105 archive_member *m;
1214 vapier 1.106 char *ar_buffer;
1215     elfobj *elf;
1216    
1217     ar = ar_open_fd(filename, fd);
1218     if (ar == NULL)
1219     return 1;
1220    
1221     ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1222     while ((m=ar_next(ar)) != NULL) {
1223     elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1224     if (elf) {
1225     scanelf_elfobj(elf);
1226     unreadelf(elf);
1227     }
1228     }
1229     munmap(ar_buffer, len);
1230    
1231 vapier 1.105 return 0;
1232     }
1233     /* scan a file which may be an elf or an archive or some other magical beast */
1234     static void scanelf_file(const char *filename)
1235     {
1236     struct stat st;
1237 vapier 1.106 int fd;
1238 vapier 1.105
1239     /* make sure 'filename' exists */
1240     if (lstat(filename, &st) == -1) {
1241     if (be_verbose > 2) printf("%s: does not exist\n", filename);
1242     return;
1243     }
1244    
1245     /* always handle regular files and handle symlinked files if no -y */
1246     if (S_ISLNK(st.st_mode)) {
1247     if (!scan_symlink) return;
1248     stat(filename, &st);
1249     }
1250     if (!S_ISREG(st.st_mode)) {
1251     if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1252     return;
1253     }
1254    
1255 vapier 1.106 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1256     return;
1257    
1258     if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives)
1259 vapier 1.105 /* if it isn't an ELF, maybe it's an .a archive */
1260 vapier 1.106 scanelf_archive(filename, fd, st.st_size);
1261    
1262     close(fd);
1263 solar 1.6 }
1264    
1265 solar 1.1 /* scan a directory for ET_EXEC files and print when we find one */
1266 vapier 1.10 static void scanelf_dir(const char *path)
1267 solar 1.1 {
1268 vapier 1.10 register DIR *dir;
1269     register struct dirent *dentry;
1270 vapier 1.14 struct stat st_top, st;
1271 vapier 1.104 char buf[__PAX_UTILS_PATH_MAX];
1272 vapier 1.32 size_t pathlen = 0, len = 0;
1273 vapier 1.10
1274     /* make sure path exists */
1275 vapier 1.39 if (lstat(path, &st_top) == -1) {
1276     if (be_verbose > 2) printf("%s: does not exist\n", path);
1277 vapier 1.10 return;
1278 vapier 1.39 }
1279 solar 1.11
1280 vapier 1.10 /* ok, if it isn't a directory, assume we can open it */
1281 vapier 1.14 if (!S_ISDIR(st_top.st_mode)) {
1282 vapier 1.10 scanelf_file(path);
1283     return;
1284     }
1285    
1286     /* now scan the dir looking for fun stuff */
1287     if ((dir = opendir(path)) == NULL) {
1288     warnf("could not opendir %s: %s", path, strerror(errno));
1289     return;
1290     }
1291 vapier 1.114 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1292 solar 1.11
1293 vapier 1.32 pathlen = strlen(path);
1294 vapier 1.10 while ((dentry = readdir(dir))) {
1295     if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1296     continue;
1297 vapier 1.32 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1298     if (len >= sizeof(buf)) {
1299 vapier 1.76 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1300     (unsigned long)len, (unsigned long)sizeof(buf));
1301 vapier 1.32 continue;
1302     }
1303 solar 1.143 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1304 solar 1.20 if (lstat(buf, &st) != -1) {
1305 vapier 1.10 if (S_ISREG(st.st_mode))
1306 solar 1.20 scanelf_file(buf);
1307 vapier 1.10 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1308 vapier 1.14 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1309 solar 1.20 scanelf_dir(buf);
1310 vapier 1.10 }
1311     }
1312     }
1313     closedir(dir);
1314 solar 1.1 }
1315    
1316 vapier 1.133 static int scanelf_from_file(const char *filename)
1317 vapier 1.47 {
1318 solar 1.45 FILE *fp = NULL;
1319     char *p;
1320 vapier 1.104 char path[__PAX_UTILS_PATH_MAX];
1321 solar 1.45
1322 solar 1.132 if (strcmp(filename, "-") == 0)
1323 solar 1.45 fp = stdin;
1324     else if ((fp = fopen(filename, "r")) == NULL)
1325     return 1;
1326    
1327 vapier 1.104 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1328 solar 1.45 if ((p = strchr(path, '\n')) != NULL)
1329     *p = 0;
1330 vapier 1.66 search_path = path;
1331 solar 1.45 scanelf_dir(path);
1332     }
1333     if (fp != stdin)
1334     fclose(fp);
1335     return 0;
1336     }
1337    
1338 solar 1.154 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1339 vapier 1.148
1340     static int load_ld_cache_config(int i, const char *fname)
1341 vapier 1.48 {
1342     FILE *fp = NULL;
1343     char *p;
1344 vapier 1.104 char path[__PAX_UTILS_PATH_MAX];
1345 vapier 1.48
1346 vapier 1.149 if (i + 1 == ARRAY_SIZE(ldpaths))
1347 solar 1.123 return i;
1348    
1349     if ((fp = fopen(fname, "r")) == NULL)
1350     return i;
1351 vapier 1.48
1352 vapier 1.104 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1353 vapier 1.48 if ((p = strrchr(path, '\r')) != NULL)
1354     *p = 0;
1355     if ((p = strchr(path, '\n')) != NULL)
1356     *p = 0;
1357 solar 1.154 #ifdef __linux__
1358 solar 1.123 // recursive includes of the same file will make this segfault.
1359 solar 1.129 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1360 solar 1.123 glob64_t gl;
1361     size_t x;
1362     char gpath[__PAX_UTILS_PATH_MAX];
1363    
1364 solar 1.129 memset(gpath, 0, sizeof(gpath));
1365 solar 1.123
1366     if (path[8] != '/')
1367 solar 1.129 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1368 solar 1.123 else
1369 solar 1.129 strncpy(gpath, &path[8], sizeof(gpath));
1370 solar 1.123
1371     if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1372     for (x = 0; x < gl.gl_pathc; ++x) {
1373     /* try to avoid direct loops */
1374     if (strcmp(gl.gl_pathv[x], fname) == 0)
1375     continue;
1376 vapier 1.148 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1377 vapier 1.149 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1378 solar 1.123 globfree64(&gl);
1379     return i;
1380     }
1381     }
1382     globfree64 (&gl);
1383     continue;
1384     } else
1385     abort();
1386     }
1387 solar 1.154 #endif
1388 solar 1.123 if (*path != '/')
1389     continue;
1390 vapier 1.48
1391     ldpaths[i++] = xstrdup(path);
1392    
1393 vapier 1.149 if (i + 1 == ARRAY_SIZE(ldpaths))
1394 vapier 1.48 break;
1395     }
1396     ldpaths[i] = NULL;
1397    
1398     fclose(fp);
1399 solar 1.123 return i;
1400 vapier 1.48 }
1401 flameeyes 1.141
1402 vapier 1.148 #elif defined(__FreeBSD__) || (__DragonFly__)
1403    
1404     static int load_ld_cache_config(int i, const char *fname)
1405 flameeyes 1.141 {
1406     FILE *fp = NULL;
1407     char *b = NULL, *p;
1408     struct elfhints_hdr hdr;
1409 vapier 1.152
1410 vapier 1.149 if (i + 1 == ARRAY_SIZE(ldpaths))
1411 flameeyes 1.141 return i;
1412    
1413     if ((fp = fopen(fname, "r")) == NULL)
1414     return i;
1415    
1416 vapier 1.152 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1417     hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1418     fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1419     {
1420 flameeyes 1.141 fclose(fp);
1421     return i;
1422     }
1423 vapier 1.152
1424 flameeyes 1.141 b = (char*)malloc(hdr.dirlistlen+1);
1425 vapier 1.152 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1426 flameeyes 1.141 fclose(fp);
1427     free(b);
1428     return i;
1429     }
1430 vapier 1.152
1431     while ((p = strsep(&b, ":"))) {
1432     if (*p == '\0') continue;
1433 flameeyes 1.141 ldpaths[i++] = xstrdup(p);
1434 vapier 1.152
1435 vapier 1.149 if (i + 1 == ARRAY_SIZE(ldpaths))
1436 flameeyes 1.141 break;
1437     }
1438     ldpaths[i] = NULL;
1439 vapier 1.157
1440 flameeyes 1.141 free(b);
1441     fclose(fp);
1442     return i;
1443     }
1444 vapier 1.148
1445     #else
1446    
1447     #warning Cache config support not implemented for your target
1448     static int load_ld_cache_config(int i, const char *fname)
1449     {
1450     memset(ldpaths, 0x00, sizeof(ldpaths));
1451     }
1452    
1453 flameeyes 1.141 #endif
1454 vapier 1.48
1455 vapier 1.10 /* scan /etc/ld.so.conf for paths */
1456     static void scanelf_ldpath()
1457     {
1458 vapier 1.17 char scan_l, scan_ul, scan_ull;
1459 vapier 1.48 int i = 0;
1460 vapier 1.10
1461 vapier 1.48 if (!ldpaths[0])
1462     err("Unable to load any paths from ld.so.conf");
1463 vapier 1.10
1464 vapier 1.17 scan_l = scan_ul = scan_ull = 0;
1465    
1466 vapier 1.48 while (ldpaths[i]) {
1467     if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1468     if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1469     if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1470     scanelf_dir(ldpaths[i]);
1471     ++i;
1472     }
1473 vapier 1.10
1474 vapier 1.17 if (!scan_l) scanelf_dir("/lib");
1475     if (!scan_ul) scanelf_dir("/usr/lib");
1476     if (!scan_ull) scanelf_dir("/usr/local/lib");
1477 vapier 1.10 }
1478 solar 1.1
1479 vapier 1.10 /* scan env PATH for paths */
1480     static void scanelf_envpath()
1481 solar 1.1 {
1482 solar 1.34 char *path, *p;
1483 vapier 1.10
1484     path = getenv("PATH");
1485     if (!path)
1486     err("PATH is not set in your env !");
1487 vapier 1.41 path = xstrdup(path);
1488 vapier 1.10
1489     while ((p = strrchr(path, ':')) != NULL) {
1490     scanelf_dir(p + 1);
1491     *p = 0;
1492     }
1493 vapier 1.17
1494 solar 1.34 free(path);
1495 solar 1.1 }
1496    
1497 vapier 1.10 /* usage / invocation handling functions */
1498 solar 1.127 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1499 vapier 1.27 #define a_argument required_argument
1500 vapier 1.10 static struct option const long_opts[] = {
1501     {"path", no_argument, NULL, 'p'},
1502     {"ldpath", no_argument, NULL, 'l'},
1503     {"recursive", no_argument, NULL, 'R'},
1504 vapier 1.14 {"mount", no_argument, NULL, 'm'},
1505 vapier 1.37 {"symlink", no_argument, NULL, 'y'},
1506 vapier 1.105 {"archives", no_argument, NULL, 'A'},
1507     {"ldcache", no_argument, NULL, 'L'},
1508 vapier 1.101 {"fix", no_argument, NULL, 'X'},
1509 solar 1.127 {"setpax", a_argument, NULL, 'z'},
1510 vapier 1.10 {"pax", no_argument, NULL, 'x'},
1511 solar 1.16 {"header", no_argument, NULL, 'e'},
1512 vapier 1.10 {"textrel", no_argument, NULL, 't'},
1513     {"rpath", no_argument, NULL, 'r'},
1514 vapier 1.32 {"needed", no_argument, NULL, 'n'},
1515 vapier 1.38 {"interp", no_argument, NULL, 'i'},
1516 vapier 1.49 {"bind", no_argument, NULL, 'b'},
1517 vapier 1.84 {"soname", no_argument, NULL, 'S'},
1518 vapier 1.76 {"symbol", a_argument, NULL, 's'},
1519 solar 1.124 {"section", a_argument, NULL, 'k'},
1520 vapier 1.76 {"lib", a_argument, NULL, 'N'},
1521 solar 1.86 {"gmatch", no_argument, NULL, 'g'},
1522 vapier 1.76 {"textrels", no_argument, NULL, 'T'},
1523 solar 1.119 {"etype", a_argument, NULL, 'E'},
1524 solar 1.120 {"bits", a_argument, NULL, 'M'},
1525 vapier 1.10 {"all", no_argument, NULL, 'a'},
1526     {"quiet", no_argument, NULL, 'q'},
1527 vapier 1.14 {"verbose", no_argument, NULL, 'v'},
1528 vapier 1.76 {"format", a_argument, NULL, 'F'},
1529     {"from", a_argument, NULL, 'f'},
1530     {"file", a_argument, NULL, 'o'},
1531 solar 1.16 {"nobanner", no_argument, NULL, 'B'},
1532 vapier 1.10 {"help", no_argument, NULL, 'h'},
1533     {"version", no_argument, NULL, 'V'},
1534     {NULL, no_argument, NULL, 0x0}
1535     };
1536 solar 1.57
1537 solar 1.68 static const char *opts_help[] = {
1538 vapier 1.10 "Scan all directories in PATH environment",
1539     "Scan all directories in /etc/ld.so.conf",
1540 vapier 1.14 "Scan directories recursively",
1541 vapier 1.37 "Don't recursively cross mount points",
1542 vapier 1.101 "Don't scan symlinks",
1543 vapier 1.105 "Scan archives (.a files)",
1544     "Utilize ld.so.cache information (use with -r/-n)",
1545 solar 1.127 "Try and 'fix' bad things (use with -r/-e)",
1546     "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1547 vapier 1.10 "Print PaX markings",
1548 vapier 1.71 "Print GNU_STACK/PT_LOAD markings",
1549 vapier 1.10 "Print TEXTREL information",
1550     "Print RPATH information",
1551 vapier 1.32 "Print NEEDED information",
1552 vapier 1.38 "Print INTERP information",
1553 vapier 1.49 "Print BIND information",
1554 vapier 1.84 "Print SONAME information",
1555 vapier 1.27 "Find a specified symbol",
1556 solar 1.124 "Find a specified section",
1557 vapier 1.72 "Find a specified library",
1558 solar 1.86 "Use strncmp to match libraries. (use with -N)",
1559 vapier 1.76 "Locate cause of TEXTREL",
1560 solar 1.129 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1561 solar 1.120 "Print only ELF files matching numeric bits",
1562 vapier 1.82 "Print all scanned info (-x -e -t -r -b)\n",
1563 vapier 1.14 "Only output 'bad' things",
1564     "Be verbose (can be specified more than once)",
1565 vapier 1.39 "Use specified format for output",
1566 solar 1.45 "Read input stream from a filename",
1567 vapier 1.24 "Write output stream to a filename",
1568 vapier 1.14 "Don't display the header",
1569 vapier 1.10 "Print this help and exit",
1570     "Print version and exit",
1571     NULL
1572     };
1573    
1574     /* display usage and exit */
1575     static void usage(int status)
1576 solar 1.1 {
1577 vapier 1.44 unsigned long i;
1578 solar 1.52 printf("* Scan ELF binaries for stuff\n\n"
1579 vapier 1.105 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1580 solar 1.35 printf("Options: -[%s]\n", PARSE_FLAGS);
1581 vapier 1.10 for (i = 0; long_opts[i].name; ++i)
1582 vapier 1.27 if (long_opts[i].has_arg == no_argument)
1583 vapier 1.157 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1584 vapier 1.27 long_opts[i].name, opts_help[i]);
1585     else
1586 solar 1.124 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1587 vapier 1.27 long_opts[i].name, opts_help[i]);
1588 solar 1.45
1589     if (status != EXIT_SUCCESS)
1590     exit(status);
1591 vapier 1.157
1592 vapier 1.46 puts("\nThe format modifiers for the -F option are:");
1593 vapier 1.70 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1594     puts(" t TEXTREL \tr RPATH \tn NEEDED");
1595     puts(" i INTERP \tb BIND \ts symbol");
1596 vapier 1.76 puts(" N library \to Type \tT TEXTRELs");
1597 solar 1.125 puts(" S SONAME \tk section");
1598 vapier 1.70 puts(" p filename (with search path removed)");
1599 vapier 1.88 puts(" f filename (short name/basename)");
1600 vapier 1.70 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1601 solar 1.45
1602 solar 1.121 puts("\nELF Etypes:");
1603     print_etypes(stdout);
1604    
1605 vapier 1.10 exit(status);
1606 solar 1.1 }
1607    
1608     /* parse command line arguments and preform needed actions */
1609 vapier 1.10 static void parseargs(int argc, char *argv[])
1610     {
1611 vapier 1.48 int i;
1612 vapier 1.133 const char *from_file = NULL;
1613 vapier 1.10
1614     opterr = 0;
1615 vapier 1.48 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1616     switch (i) {
1617 vapier 1.10
1618 vapier 1.39 case 'V':
1619 vapier 1.80 printf("pax-utils-%s: %s compiled %s\n%s\n"
1620     "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1621     VERSION, __FILE__, __DATE__, rcsid, argv0);
1622 vapier 1.10 exit(EXIT_SUCCESS);
1623     break;
1624     case 'h': usage(EXIT_SUCCESS); break;
1625 solar 1.45 case 'f':
1626 vapier 1.100 if (from_file) warn("You prob don't want to specify -f twice");
1627     from_file = optarg;
1628 solar 1.45 break;
1629 solar 1.119 case 'E':
1630     strncpy(match_etypes, optarg, sizeof(match_etypes));
1631     break;
1632 solar 1.120 case 'M':
1633     match_bits = atoi(optarg);
1634     break;
1635 vapier 1.24 case 'o': {
1636 vapier 1.146 if (freopen(optarg, "w", stdout) == NULL)
1637 vapier 1.24 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1638 solar 1.21 break;
1639     }
1640 solar 1.124 case 'k':
1641 vapier 1.126 if (find_section) warn("You prob don't want to specify -k twice");
1642 solar 1.124 find_section = optarg;
1643     break;
1644 vapier 1.39 case 's': {
1645 vapier 1.93 if (find_sym) warn("You prob don't want to specify -s twice");
1646     find_sym = optarg;
1647     versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1648 vapier 1.39 sprintf(versioned_symname, "%s@", find_sym);
1649     break;
1650     }
1651 vapier 1.72 case 'N': {
1652 vapier 1.93 if (find_lib) warn("You prob don't want to specify -N twice");
1653     find_lib = optarg;
1654 vapier 1.72 break;
1655     }
1656 vapier 1.39
1657     case 'F': {
1658 vapier 1.93 if (out_format) warn("You prob don't want to specify -F twice");
1659     out_format = optarg;
1660 vapier 1.39 break;
1661     }
1662 solar 1.127 case 'z': {
1663 solar 1.129 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1664 solar 1.127 size_t x;
1665 vapier 1.27
1666 solar 1.127 for (x = 0 ; x < strlen(optarg); x++) {
1667     switch(optarg[x]) {
1668     case 'p':
1669     case 'P':
1670     do_state(optarg[x], PAGEEXEC);
1671     break;
1672     case 's':
1673     case 'S':
1674     do_state(optarg[x], SEGMEXEC);
1675     break;
1676     case 'm':
1677     case 'M':
1678     do_state(optarg[x], MPROTECT);
1679     break;
1680     case 'e':
1681     case 'E':
1682     do_state(optarg[x], EMUTRAMP);
1683     break;
1684     case 'r':
1685     case 'R':
1686     do_state(optarg[x], RANDMMAP);
1687     break;
1688     case 'x':
1689     case 'X':
1690     do_state(optarg[x], RANDEXEC);
1691     break;
1692     default:
1693     break;
1694     }
1695     }
1696     if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1697     ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1698     ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1699     ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1700     ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1701     ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1702     setpax = flags;
1703     break;
1704     }
1705 vapier 1.122 case 'g': gmatch = 1; break;
1706 vapier 1.102 case 'L': use_ldcache = 1; break;
1707 vapier 1.37 case 'y': scan_symlink = 0; break;
1708 vapier 1.105 case 'A': scan_archives = 1; break;
1709 solar 1.16 case 'B': show_banner = 0; break;
1710 vapier 1.10 case 'l': scan_ldpath = 1; break;
1711     case 'p': scan_envpath = 1; break;
1712     case 'R': dir_recurse = 1; break;
1713 vapier 1.14 case 'm': dir_crossmount = 0; break;
1714 vapier 1.101 case 'X': ++fix_elf; break;
1715 vapier 1.10 case 'x': show_pax = 1; break;
1716 solar 1.73 case 'e': show_phdr = 1; break;
1717 vapier 1.10 case 't': show_textrel = 1; break;
1718     case 'r': show_rpath = 1; break;
1719 vapier 1.32 case 'n': show_needed = 1; break;
1720 vapier 1.38 case 'i': show_interp = 1; break;
1721 vapier 1.49 case 'b': show_bind = 1; break;
1722 vapier 1.84 case 'S': show_soname = 1; break;
1723 vapier 1.76 case 'T': show_textrels = 1; break;
1724 vapier 1.10 case 'q': be_quiet = 1; break;
1725 vapier 1.14 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1726 vapier 1.82 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1727 vapier 1.10
1728     case ':':
1729 vapier 1.113 err("Option '%c' is missing parameter", optopt);
1730 vapier 1.10 case '?':
1731 solar 1.119 err("Unknown option '%c' or argument missing", optopt);
1732 vapier 1.10 default:
1733 vapier 1.113 err("Unhandled option '%c'; please report this", i);
1734 vapier 1.10 }
1735     }
1736    
1737 vapier 1.39 /* let the format option override all other options */
1738     if (out_format) {
1739 solar 1.73 show_pax = show_phdr = show_textrel = show_rpath = \
1740 vapier 1.84 show_needed = show_interp = show_bind = show_soname = \
1741     show_textrels = 0;
1742 vapier 1.48 for (i = 0; out_format[i]; ++i) {
1743 vapier 1.70 if (!IS_MODIFIER(out_format[i])) continue;
1744 vapier 1.39
1745 vapier 1.48 switch (out_format[++i]) {
1746 solar 1.132 case '+': break;
1747 vapier 1.39 case '%': break;
1748 vapier 1.70 case '#': break;
1749 vapier 1.39 case 'F': break;
1750 vapier 1.66 case 'p': break;
1751     case 'f': break;
1752 solar 1.124 case 'k': break;
1753 vapier 1.39 case 's': break;
1754 vapier 1.72 case 'N': break;
1755 vapier 1.41 case 'o': break;
1756 vapier 1.39 case 'x': show_pax = 1; break;
1757 solar 1.73 case 'e': show_phdr = 1; break;
1758 vapier 1.39 case 't': show_textrel = 1; break;
1759     case 'r': show_rpath = 1; break;
1760     case 'n': show_needed = 1; break;
1761     case 'i': show_interp = 1; break;
1762 vapier 1.49 case 'b': show_bind = 1; break;
1763 vapier 1.84 case 'S': show_soname = 1; break;
1764 vapier 1.76 case 'T': show_textrels = 1; break;
1765 vapier 1.39 default:
1766     err("Invalid format specifier '%c' (byte %i)",
1767 vapier 1.48 out_format[i], i+1);
1768 vapier 1.39 }
1769     }
1770 vapier 1.41
1771     /* construct our default format */
1772     } else {
1773     size_t fmt_len = 30;
1774     out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1775 vapier 1.76 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1776     if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1777     if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1778     if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1779     if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1780     if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1781     if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1782     if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1783 vapier 1.84 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1784 vapier 1.76 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1785     if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1786 solar 1.124 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1787 vapier 1.76 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1788     if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1789 vapier 1.39 }
1790 vapier 1.41 if (be_verbose > 2) printf("Format: %s\n", out_format);
1791 vapier 1.39
1792     /* now lets actually do the scanning */
1793 vapier 1.102 if (scan_ldpath || use_ldcache)
1794 vapier 1.148 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1795 vapier 1.10 if (scan_ldpath) scanelf_ldpath();
1796     if (scan_envpath) scanelf_envpath();
1797 solar 1.153 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1798 vapier 1.133 from_file = "-";
1799 solar 1.45 if (from_file) {
1800     scanelf_from_file(from_file);
1801     from_file = *argv;
1802     }
1803     if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1804 vapier 1.25 err("Nothing to scan !?");
1805 vapier 1.66 while (optind < argc) {
1806     search_path = argv[optind++];
1807     scanelf_dir(search_path);
1808     }
1809 vapier 1.27
1810 vapier 1.39 /* clean up */
1811 vapier 1.152 free(versioned_symname);
1812 vapier 1.48 for (i = 0; ldpaths[i]; ++i)
1813     free(ldpaths[i]);
1814 solar 1.96
1815     if (ldcache != 0)
1816     munmap(ldcache, ldcache_size);
1817 vapier 1.10 }
1818    
1819 vapier 1.150 static char **get_split_env(const char *envvar)
1820     {
1821 vapier 1.152 const char *delims = " \t\n";
1822 solar 1.143 char **envvals = NULL;
1823 vapier 1.152 char *env, *s;
1824 kevquinn 1.142 int nentry;
1825    
1826 solar 1.143 if ((env = getenv(envvar)) == NULL)
1827     return NULL;
1828 kevquinn 1.142
1829 solar 1.143 env = xstrdup(env);
1830     if (env == NULL)
1831     return NULL;
1832 kevquinn 1.142
1833 vapier 1.152 s = strtok(env, delims);
1834     if (s == NULL) {
1835     free(env);
1836     return NULL;
1837     }
1838    
1839 solar 1.143 nentry = 0;
1840 vapier 1.152 while (s != NULL) {
1841     ++nentry;
1842     envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1843     envvals[nentry-1] = s;
1844     s = strtok(NULL, delims);
1845 kevquinn 1.142 }
1846 vapier 1.152 envvals[nentry] = NULL;
1847 kevquinn 1.142
1848 vapier 1.152 /* don't want to free(env) as it contains the memory that backs
1849     * the envvals array of strings */
1850 kevquinn 1.142 return envvals;
1851     }
1852 vapier 1.150 static void parseenv()
1853     {
1854     qa_textrels = get_split_env("QA_TEXTRELS");
1855     qa_execstack = get_split_env("QA_EXECSTACK");
1856     qa_wx_load = get_split_env("QA_WX_LOAD");
1857 vapier 1.41 }
1858 vapier 1.152 #ifdef __PAX_UTILS_CLEANUP
1859     static void cleanup()
1860     {
1861     free(out_format);
1862     free(qa_textrels);
1863     free(qa_execstack);
1864     free(qa_wx_load);
1865     }
1866     #endif
1867 vapier 1.41
1868    
1869 vapier 1.72
1870 vapier 1.10 int main(int argc, char *argv[])
1871 solar 1.1 {
1872 vapier 1.10 if (argc < 2)
1873     usage(EXIT_FAILURE);
1874 kevquinn 1.142 parseenv();
1875 vapier 1.10 parseargs(argc, argv);
1876 solar 1.21 fclose(stdout);
1877 vapier 1.152 #ifdef __PAX_UTILS_CLEANUP
1878     cleanup();
1879     warn("The calls to add/delete heap should be off:\n"
1880     "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1881     "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1882 solar 1.61 #endif
1883 vapier 1.10 return EXIT_SUCCESS;
1884 solar 1.1 }
1885 vapier 1.155
1886    
1887    
1888     /* utility funcs */
1889     static char *xstrdup(const char *s)
1890     {
1891     char *ret = strdup(s);
1892     if (!ret) err("Could not strdup(): %s", strerror(errno));
1893     return ret;
1894     }
1895     static void *xmalloc(size_t size)
1896     {
1897     void *ret = malloc(size);
1898     if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1899     return ret;
1900     }
1901     static void *xrealloc(void *ptr, size_t size)
1902     {
1903     void *ret = realloc(ptr, size);
1904     if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
1905     return ret;
1906     }
1907     static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1908     {
1909     size_t new_len;
1910    
1911     new_len = strlen(*dst) + strlen(src);
1912     if (*curr_len <= new_len) {
1913     *curr_len = new_len + (*curr_len / 2);
1914     *dst = realloc(*dst, *curr_len);
1915     if (!*dst)
1916     err("could not realloc() %li bytes", (unsigned long)*curr_len);
1917     }
1918    
1919     if (n)
1920     strncat(*dst, src, n);
1921     else
1922     strcat(*dst, src);
1923     }
1924     static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1925     {
1926     static char my_app[2];
1927     my_app[0] = append;
1928     my_app[1] = '\0';
1929     xstrcat(dst, my_app, curr_len);
1930     }
1931    
1932     /* Match filename against entries in matchlist, return TRUE
1933     * if the file is listed */
1934     static int file_matches_list(const char *filename, char **matchlist)
1935     {
1936     char **file;
1937     char *match;
1938     char buf[__PAX_UTILS_PATH_MAX];
1939    
1940     if (matchlist == NULL)
1941     return 0;
1942    
1943     for (file = matchlist; *file != NULL; file++) {
1944     if (search_path) {
1945     snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
1946     match = buf;
1947     } else {
1948     match = *file;
1949     }
1950     if (fnmatch(match, filename, 0) == 0)
1951     return 1;
1952     }
1953     return 0;
1954     }

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