/*
* Copyright 2003-2006 Gentoo Foundation
* Distributed under the terms of the GNU General Public License v2
* $Header: /var/cvsroot/gentoo-projects/pax-utils/scanelf.c,v 1.166 2006/12/11 03:31:54 vapier Exp $
*
* Copyright 2003-2006 Ned Ludd - <solar@gentoo.org>
* Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org>
*/
#include "paxinc.h"
static const char *rcsid = "$Id: scanelf.c,v 1.166 2006/12/11 03:31:54 vapier Exp $";
#define argv0 "scanelf"
#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
/* prototypes */
static int file_matches_list(const char *filename, char **matchlist);
static int scanelf_elfobj(elfobj *elf);
static int scanelf_elf(const char *filename, int fd, size_t len);
static int scanelf_archive(const char *filename, int fd, size_t len);
static int scanelf_file(const char *filename, const struct stat *st_cache);
static int scanelf_dir(const char *path);
static void scanelf_ldpath(void);
static void scanelf_envpath(void);
static void usage(int status);
static char **get_split_env(const char *envvar);
static void parseenv(void);
static int parseargs(int argc, char *argv[]);
static char *xstrdup(const char *s);
static void *xmalloc(size_t size);
static void *xrealloc(void *ptr, size_t size);
static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
static inline void xchrcat(char **dst, const char append, size_t *curr_len);
/* variables to control behavior */
static char match_etypes[126] = "";
static char *ldpaths[256];
static char scan_ldpath = 0;
static char scan_envpath = 0;
static char scan_symlink = 1;
static char scan_archives = 0;
static char dir_recurse = 0;
static char dir_crossmount = 1;
static char show_pax = 0;
static char show_phdr = 0;
static char show_textrel = 0;
static char show_rpath = 0;
static char show_needed = 0;
static char show_interp = 0;
static char show_bind = 0;
static char show_soname = 0;
static char show_textrels = 0;
static char show_banner = 1;
static char be_quiet = 0;
static char be_verbose = 0;
static char be_wewy_wewy_quiet = 0;
static char be_semi_verbose = 0;
static char *find_sym = NULL, *versioned_symname = NULL;
static char *find_lib = NULL;
static char *find_section = NULL;
static char *out_format = NULL;
static char *search_path = NULL;
static char fix_elf = 0;
static char gmatch = 0;
static char use_ldcache = 0;
static char **qa_textrels = NULL;
static char **qa_execstack = NULL;
static char **qa_wx_load = NULL;
int match_bits = 0;
caddr_t ldcache = 0;
size_t ldcache_size = 0;
unsigned long setpax = 0UL;
/* sub-funcs for scanelf_file() */
static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
{
/* find the best SHT_DYNSYM and SHT_STRTAB sections */
#define GET_SYMTABS(B) \
if (elf->elf_class == ELFCLASS ## B) { \
Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
/* debug sections */ \
symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
/* runtime sections */ \
dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
if (symtab && dynsym) { \
*sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
} else { \
*sym = (void*)(symtab ? symtab : dynsym); \
} \
if (strtab && dynstr) { \
*tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
} else { \
*tab = (void*)(strtab ? strtab : dynstr); \
} \
}
GET_SYMTABS(32)
GET_SYMTABS(64)
}
static char *scanelf_file_pax(elfobj *elf, char *found_pax)
{
static char ret[7];
unsigned long i, shown;
if (!show_pax) return NULL;
shown = 0;
memset(&ret, 0, sizeof(ret));
if (elf->phdr) {
#define SHOW_PAX(B) \
if (elf->elf_class == ELFCLASS ## B) { \
Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
continue; \
if (fix_elf && setpax) { \
/* set the paxctl flags */ \
ESET(phdr[i].p_flags, setpax); \
} \
if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
continue; \
memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
*found_pax = 1; \
++shown; \
break; \
} \
}
SHOW_PAX(32)
SHOW_PAX(64)
}
if (fix_elf && setpax) {
/* set the chpax settings */
if (elf->elf_class == ELFCLASS32) {
if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
} else {
if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
}
}
/* fall back to EI_PAX if no PT_PAX was found */
if (!*ret) {
static char *paxflags;
paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
*found_pax = 1;
return (be_wewy_wewy_quiet ? NULL : paxflags);
}
strncpy(ret, paxflags, sizeof(ret));
}
if (be_wewy_wewy_quiet || (be_quiet && !shown))
return NULL;
else
return ret;
}
static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
{
static char ret[12];
char *found;
unsigned long i, shown, multi_stack, multi_relro, multi_load;
int max_pt_load;
if (!show_phdr) return NULL;
memcpy(ret, "--- --- ---\0", 12);
shown = 0;
multi_stack = multi_relro = multi_load = 0;
max_pt_load = elf_max_pt_load(elf);
#define NOTE_GNU_STACK ".note.GNU-stack"
#define SHOW_PHDR(B) \
if (elf->elf_class == ELFCLASS ## B) { \
Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
Elf ## B ## _Off offset; \
uint32_t flags, check_flags; \
if (elf->phdr != NULL) { \
Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
if (multi_stack++) \
warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
if (file_matches_list(elf->filename, qa_execstack)) \
continue; \
found = found_phdr; \
offset = 0; \
check_flags = PF_X; \
} else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
if (multi_relro++) \
warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
found = found_relro; \
offset = 4; \
check_flags = PF_X; \
} else if (EGET(phdr[i].p_type) == PT_LOAD) { \
if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
if (multi_load++ > max_pt_load) \
warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
if (file_matches_list(elf->filename, qa_wx_load)) \
continue; \
found = found_load; \
offset = 8; \
check_flags = PF_W|PF_X; \
} else \
continue; \
flags = EGET(phdr[i].p_flags); \
if (be_quiet && ((flags & check_flags) != check_flags)) \
continue; \
if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
ret[3] = ret[7] = '!'; \
flags = EGET(phdr[i].p_flags); \
} \
memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
*found = 1; \
++shown; \
} \
} else if (elf->shdr != NULL) { \
/* no program headers which means this is prob an object file */ \
Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
char *str; \
if ((void*)strtbl > (void*)elf->data_end) \
goto skip_this_shdr##B; \
check_flags = SHF_WRITE|SHF_EXECINSTR; \
for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
str = elf->data + offset; \
if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
if (!strcmp(str, NOTE_GNU_STACK)) { \
if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
flags = EGET(shdr[i].sh_flags); \
if (be_quiet && ((flags & check_flags) != check_flags)) \
continue; \
++*found_phdr; \
shown = 1; \
if (flags & SHF_WRITE) ret[0] = 'W'; \
if (flags & SHF_ALLOC) ret[1] = 'A'; \
if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
break; \
} \
} \
skip_this_shdr##B: \
if (!multi_stack) { \
if (file_matches_list(elf->filename, qa_execstack)) \
return NULL; \
*found_phdr = 1; \
shown = 1; \
memcpy(ret, "!WX", 3); \
} \
} \
}
SHOW_PHDR(32)
SHOW_PHDR(64)
if (be_wewy_wewy_quiet || (be_quiet && !shown))
return NULL;
else
return ret;
}
static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
{
static const char *ret = "TEXTREL";
unsigned long i;
if (!show_textrel && !show_textrels) return NULL;
if (file_matches_list(elf->filename, qa_textrels)) return NULL;
if (elf->phdr) {
#define SHOW_TEXTREL(B) \
if (elf->elf_class == ELFCLASS ## B) { \
Elf ## B ## _Dyn *dyn; \
Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
Elf ## B ## _Off offset; \
for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
offset = EGET(phdr[i].p_offset); \
if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
dyn = DYN ## B (elf->data + offset); \
while (EGET(dyn->d_tag) != DT_NULL) { \
if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
*found_textrel = 1; \
/*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
return (be_wewy_wewy_quiet ? NULL : ret); \
} \
++dyn; \
} \
} }
SHOW_TEXTREL(32)
SHOW_TEXTREL(64)
}
if (be_quiet || be_wewy_wewy_quiet)
return NULL;
else
return " - ";
}
static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
{
unsigned long s, r, rmax;
void *symtab_void, *strtab_void, *text_void;
if (!show_textrels) return NULL;
/* don't search for TEXTREL's if the ELF doesn't have any */
if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
if (!*found_textrel) return NULL;
scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
text_void = elf_findsecbyname(elf, ".text");
if (symtab_void && strtab_void && text_void && elf->shdr) {
#define SHOW_TEXTRELS(B) \
if (elf->elf_class == ELFCLASS ## B) { \
Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
uint ## B ## _t memsz = EGET(text->sh_size); \
Elf ## B ## _Rel *rel; \
Elf ## B ## _Rela *rela; \
/* search the section headers for relocations */ \
for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
uint32_t sh_type = EGET(shdr[s].sh_type); \
if (sh_type == SHT_REL) { \
rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
rela = NULL; \
rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
} else if (sh_type == SHT_RELA) { \
rel = NULL; \
rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
} else \
continue; \
/* now see if any of the relocs are in the .text */ \
for (r = 0; r < rmax; ++r) { \
unsigned long sym_max; \
Elf ## B ## _Addr offset_tmp; \
Elf ## B ## _Sym *func; \
Elf ## B ## _Sym *sym; \
Elf ## B ## _Addr r_offset; \
uint ## B ## _t r_info; \
if (sh_type == SHT_REL) { \
r_offset = EGET(rel[r].r_offset); \
r_info = EGET(rel[r].r_info); \
} else { \
r_offset = EGET(rela[r].r_offset); \
r_info = EGET(rela[r].r_info); \
} \
/* make sure this relocation is inside of the .text */ \
if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
if (be_verbose <= 2) continue; \
} else \
*found_textrels = 1; \
/* locate this relocation symbol name */ \
sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
if ((void*)sym > (void*)elf->data_end) { \
warn("%s: corrupt ELF symbol", elf->filename); \
continue; \
} \
sym_max = ELF ## B ## _R_SYM(r_info); \
if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
sym += sym_max; \
else \
sym = NULL; \
sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
/* show the raw details about this reloc */ \
printf(" %s: ", elf->base_filename); \
if (sym && sym->st_name) \
printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
else \
printf("(memory/fake?)"); \
printf(" [0x%lX]", (unsigned long)r_offset); \
/* now try to find the closest symbol that this rel is probably in */ \
sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
func = NULL; \
offset_tmp = 0; \
while (sym_max--) { \
if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
func = sym; \
offset_tmp = EGET(sym->st_value); \
} \
++sym; \
} \
printf(" in "); \
if (func && func->st_name) \
printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
else \
printf("(NULL: fake?)"); \
printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
} \
} }
SHOW_TEXTRELS(32)
SHOW_TEXTRELS(64)
}
if (!*found_textrels)
warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
return NULL;
}
static void rpath_security_checks(elfobj *, char *, const char *);
static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
{
struct stat st;
switch (*item) {
case '/': break;
case '.':
warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
break;
case ':':
case '\0':
warnf("Security problem NULL %s in %s", dt_type, elf->filename);
break;
case '$':
if (fstat(elf->fd, &st) != -1)
if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
warnf("Security problem with %s='%s' in %s with mode set of %o",
dt_type, item, elf->filename, st.st_mode & 07777);
break;
default:
warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
break;
}
}
static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
{
unsigned long i, s;
char *rpath, *runpath, **r;
void *strtbl_void;
if (!show_rpath) return;
strtbl_void = elf_findsecbyname(elf, ".dynstr");
rpath = runpath = NULL;
if (elf->phdr && strtbl_void) {
#define SHOW_RPATH(B) \
if (elf->elf_class == ELFCLASS ## B) { \
Elf ## B ## _Dyn *dyn; \
Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
Elf ## B ## _Off offset; \
Elf ## B ## _Xword word; \
/* Scan all the program headers */ \
for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
/* Just scan dynamic headers */ \
if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
offset = EGET(phdr[i].p_offset); \
if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
/* Just scan dynamic RPATH/RUNPATH headers */ \
dyn = DYN ## B (elf->data + offset); \
while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
if (word == DT_RPATH) { \
r = &rpath; \
} else if (word == DT_RUNPATH) { \
r = &runpath; \
} else { \
++dyn; \
continue; \
} \
/* Verify the memory is somewhat sane */ \
offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
if (offset < (Elf ## B ## _Off)elf->len) { \
if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
*r = (char*)(elf->data + offset); \
/* cache the length in case we need to nuke this section later on */ \
if (fix_elf) \
offset = strlen(*r); \
/* If quiet, don't output paths in ld.so.conf */ \
if (be_quiet) { \
size_t len; \
char *start, *end; \
/* note that we only 'chop' off leading known paths. */ \
/* since *r is read-only memory, we can only move the ptr forward. */ \
start = *r; \
/* scan each path in : delimited list */ \
while (start) { \
rpath_security_checks(elf, start, get_elfdtype(word)); \
end = strchr(start, ':'); \
len = (end ? abs(end - start) : strlen(start)); \
if (use_ldcache) \
for (s = 0; ldpaths[s]; ++s) \
if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
*r = end; \
/* corner case ... if RPATH reads "/usr/lib:", we want \
* to show ':' rather than '' */ \
if (end && end[1] != '\0') \
(*r)++; \
break; \
} \
if (!*r || !end) \
break; \
else \
start = start + len + 1; \
} \
} \
if (*r) { \
if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
/* just nuke it */ \
nuke_it##B: \
memset(*r, 0x00, offset); \
*r = NULL; \
ESET(dyn->d_tag, DT_DEBUG); \
ESET(dyn->d_un.d_ptr, 0); \
} else if (fix_elf) { \
/* try to clean "bad" paths */ \
size_t len, tmpdir_len; \
char *start, *end; \
const char *tmpdir; \
start = *r; \
tmpdir = (getenv("TMPDIR") ? : "."); \
tmpdir_len = strlen(tmpdir); \
while (1) { \
end = strchr(start, ':'); \
if (start == end) { \
eat_this_path##B: \
len = strlen(end); \
memmove(start, end+1, len); \
start[len-1] = '\0'; \
end = start - 1; \
} else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
if (!end) { \
if (start == *r) \
goto nuke_it##B; \
*--start = '\0'; \
} else \
goto eat_this_path##B; \
} \
if (!end) \
break; \
start = end + 1; \
} \
if (**r == '\0') \
goto nuke_it##B; \
} \
if (*r) \
*found_rpath = 1; \
} \
} \
++dyn; \
} \
} }
SHOW_RPATH(32)
SHOW_RPATH(64)
}
if (be_wewy_wewy_quiet) return;
if (rpath && runpath) {
if (!strcmp(rpath, runpath)) {
xstrcat(ret, runpath, ret_len);
} else {
fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
xchrcat(ret, '{', ret_len);
xstrcat(ret, rpath, ret_len);
xchrcat(ret, ',', ret_len);
xstrcat(ret, runpath, ret_len);
xchrcat(ret, '}', ret_len);
}
} else if (rpath || runpath)
xstrcat(ret, (runpath ? runpath : rpath), ret_len);
else if (!be_quiet)
xstrcat(ret, " - ", ret_len);
}
#define LDSO_CACHE_MAGIC "ld.so-"
#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
#define LDSO_CACHE_VER "1.7.0"
#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
#define FLAG_ANY -1
#define FLAG_TYPE_MASK 0x00ff
#define FLAG_LIBC4 0x0000
#define FLAG_ELF 0x0001
#define FLAG_ELF_LIBC5 0x0002
#define FLAG_ELF_LIBC6 0x0003
#define FLAG_REQUIRED_MASK 0xff00
#define FLAG_SPARC_LIB64 0x0100
#define FLAG_IA64_LIB64 0x0200
#define FLAG_X8664_LIB64 0x0300
#define FLAG_S390_LIB64 0x0400
#define FLAG_POWERPC_LIB64 0x0500
#define FLAG_MIPS64_LIBN32 0x0600
#define FLAG_MIPS64_LIBN64 0x0700
static char *lookup_cache_lib(elfobj *, char *);
#if defined(__GLIBC__) || defined(__UCLIBC__)
static char *lookup_cache_lib(elfobj *elf, char *fname)
{
int fd = 0;
char *strs;
static char buf[__PAX_UTILS_PATH_MAX] = "";
const char *cachefile = "/etc/ld.so.cache";
struct stat st;
typedef struct {
char magic[LDSO_CACHE_MAGIC_LEN];
char version[LDSO_CACHE_VER_LEN];
int nlibs;
} header_t;
header_t *header;
typedef struct {
int flags;
int sooffset;
int liboffset;
} libentry_t;
libentry_t *libent;
if (fname == NULL)
return NULL;
if (ldcache == 0) {
if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
return NULL;
/* cache these values so we only map/unmap the cache file once */
ldcache_size = st.st_size;
ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
close(fd);
if (ldcache == (caddr_t)-1) {
ldcache = 0;
return NULL;
}
if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
return NULL;
if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
return NULL;
}
header = (header_t *) ldcache;
libent = (libentry_t *) (ldcache + sizeof(header_t));
strs = (char *) &libent[header->nlibs];
for (fd = 0; fd < header->nlibs; fd++) {
/* this should be more fine grained, but for now we assume that
* diff arches will not be cached together. and we ignore the
* the different multilib mips cases. */
if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
continue;
if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
continue;
if (strcmp(fname, strs + libent[fd].sooffset) != 0)
continue;
strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
}
return buf;
}
#elif defined(__NetBSD__)
static char *lookup_cache_lib(elfobj *elf, char *fname)
{
static char buf[__PAX_UTILS_PATH_MAX] = "";
static struct stat st;
char **ldpath;
for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
continue; /* if the pathname is too long, or something went wrong, ignore */
if (stat(buf, &st) != 0)
continue; /* if the lib doesn't exist in *ldpath, look further */
/* NetBSD doesn't actually do sanity checks, it just loads the file
* and if that doesn't work, continues looking in other directories.
* This cannot easily be safely emulated, unfortunately. For now,
* just assume that if it exists, it's a valid library. */
return buf;
}
/* not found in any path */
return NULL;
}
#else
#warning Cache support not implemented for your target
static char *lookup_cache_lib(elfobj *elf, char *fname)
{
return NULL;
}
#endif
static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
{
unsigned long i;
char *needed;
void *strtbl_void;
char *p;
if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
strtbl_void = elf_findsecbyname(elf, ".dynstr");
if (elf->phdr && strtbl_void) {
#define SHOW_NEEDED(B) \
if (elf->elf_class == ELFCLASS ## B) { \
Elf ## B ## _Dyn *dyn; \
Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
Elf ## B ## _Off offset; \
for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
offset = EGET(phdr[i].p_offset); \
if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
dyn = DYN ## B (elf->data + offset); \
while (EGET(dyn->d_tag) != DT_NULL) { \
if (EGET(dyn->d_tag) == DT_NEEDED) { \
offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
if (offset >= (Elf ## B ## _Off)elf->len) { \
++dyn; \
continue; \
} \
needed = (char*)(elf->data + offset); \
if (op == 0) { \
if (!be_wewy_wewy_quiet) { \
if (*found_needed) xchrcat(ret, ',', ret_len); \
if (use_ldcache) \
if ((p = lookup_cache_lib(elf, needed)) != NULL) \
needed = p; \
xstrcat(ret, needed, ret_len); \
} \
*found_needed = 1; \
} else { \
if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
*found_lib = 1; \
return (be_wewy_wewy_quiet ? NULL : needed); \
} \
} \
} \
++dyn; \
} \
} }
SHOW_NEEDED(32)
SHOW_NEEDED(64)
if (op == 0 && !*found_needed && be_verbose)
warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
}
return NULL;
}
static char *scanelf_file_interp(elfobj *elf, char *found_interp)
{
void *strtbl_void;
if (!show_interp) return NULL;
strtbl_void = elf_findsecbyname(elf, ".interp");
if (strtbl_void) {
#define SHOW_INTERP(B) \
if (elf->elf_class == ELFCLASS ## B) { \
Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
*found_interp = 1; \
return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
}
SHOW_INTERP(32)
SHOW_INTERP(64)
}
return NULL;
}
static char *scanelf_file_bind(elfobj *elf, char *found_bind)
{
unsigned long i;
struct stat s;
char dynamic = 0;
if (!show_bind) return NULL;
if (!elf->phdr) return NULL;
#define SHOW_BIND(B) \
if (elf->elf_class == ELFCLASS ## B) { \
Elf ## B ## _Dyn *dyn; \
Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
Elf ## B ## _Off offset; \
for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
dynamic = 1; \
offset = EGET(phdr[i].p_offset); \
if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
dyn = DYN ## B (elf->data + offset); \
while (EGET(dyn->d_tag) != DT_NULL) { \
if (EGET(dyn->d_tag) == DT_BIND_NOW || \
(EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
{ \
if (be_quiet) return NULL; \
*found_bind = 1; \
return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
} \
++dyn; \
} \
} \
}
SHOW_BIND(32)
SHOW_BIND(64)
if (be_wewy_wewy_quiet) return NULL;
/* don't output anything if quiet mode and the ELF is static or not setuid */
if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
return NULL;
} else {
*found_bind = 1;
return (char *) (dynamic ? "LAZY" : "STATIC");
}
}
static char *scanelf_file_soname(elfobj *elf, char *found_soname)
{
unsigned long i;
char *soname;
void *strtbl_void;
if (!show_soname) return NULL;
strtbl_void = elf_findsecbyname(elf, ".dynstr");
if (elf->phdr && strtbl_void) {
#define SHOW_SONAME(B) \
if (elf->elf_class == ELFCLASS ## B) { \
Elf ## B ## _Dyn *dyn; \
Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
Elf ## B ## _Off offset; \
/* only look for soname in shared objects */ \
if (ehdr->e_type != ET_DYN) \
return NULL; \
for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
offset = EGET(phdr[i].p_offset); \
if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
dyn = DYN ## B (elf->data + offset); \
while (EGET(dyn->d_tag) != DT_NULL) { \
if (EGET(dyn->d_tag) == DT_SONAME) { \
offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
if (offset >= (Elf ## B ## _Off)elf->len) { \
++dyn; \
continue; \
} \
soname = (char*)(elf->data + offset); \
*found_soname = 1; \
return (be_wewy_wewy_quiet ? NULL : soname); \
} \
++dyn; \
} \
} }
SHOW_SONAME(32)
SHOW_SONAME(64)
}
return NULL;
}
static char *scanelf_file_sym(elfobj *elf, char *found_sym)
{
unsigned long i;
char *ret;
void *symtab_void, *strtab_void;
if (!find_sym) return NULL;
ret = find_sym;
scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
if (symtab_void && strtab_void) {
#define FIND_SYM(B) \
if (elf->elf_class == ELFCLASS ## B) { \
Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
unsigned long cnt = EGET(symtab->sh_entsize); \
char *symname; \
if (cnt) \
cnt = EGET(symtab->sh_size) / cnt; \
for (i = 0; i < cnt; ++i) { \
if (sym->st_name) { \
/* make sure the symbol name is in acceptable memory range */ \
symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
if ((void*)symname > (void*)elf->data_end) { \
warnf("%s: corrupt ELF symbols", elf->filename); \
++sym; \
continue; \
} \
/* debug display ... show all symbols and some extra info */ \
if (*ret == '*') { \
printf("%s(%s) %5lX %15s %s\n", \
((*found_sym == 0) ? "\n\t" : "\t"), \
elf->base_filename, \
(unsigned long)sym->st_size, \
get_elfstttype(sym->st_info), \
symname); \
*found_sym = 1; \
} else { \
/* allow the user to specify a comma delimited list of symbols to search for */ \
char *this_sym, *this_sym_ver, *next_sym; \
this_sym = ret; \
this_sym_ver = versioned_symname; \
do { \
next_sym = strchr(this_sym, ','); \
if (next_sym == NULL) \
next_sym = this_sym + strlen(this_sym); \
/* do we want a defined symbol ? */ \
if (*this_sym == '+') { \
if (sym->st_shndx == SHN_UNDEF) \
goto skip_this_sym##B; \
++this_sym; \
++this_sym_ver; \
/* do we want an undefined symbol ? */ \
} else if (*this_sym == '-') { \
if (sym->st_shndx != SHN_UNDEF) \
goto skip_this_sym##B; \
++this_sym; \
++this_sym_ver; \
} \
/* ok, lets compare the name now */ \
if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
(strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
if (be_semi_verbose) { \
char buf[126]; \
snprintf(buf, sizeof(buf), "%lX %s %s", \
(unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
ret = buf; \
} else \
ret = this_sym; \
(*found_sym)++; \
goto break_out; \
} \
skip_this_sym##B: this_sym = next_sym + 1; \
} while (*next_sym != '\0'); \
} \
} \
++sym; \
} }
FIND_SYM(32)
FIND_SYM(64)
}
break_out:
if (be_wewy_wewy_quiet) return NULL;
if (*find_sym != '*' && *found_sym)
return ret;
if (be_quiet)
return NULL;
else
return (char *)" - ";
}
static char *scanelf_file_sections(elfobj *elf, char *found_section)
{
if (!find_section)
return NULL;
#define FIND_SECTION(B) \
if (elf->elf_class == ELFCLASS ## B) { \
int invert; \
Elf ## B ## _Shdr *section; \
invert = (*find_section == '!' ? 1 : 0); \
section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
if ((section == NULL && invert) || (section != NULL && !invert)) \
*found_section = 1; \
}
FIND_SECTION(32)
FIND_SECTION(64)
if (be_wewy_wewy_quiet)
return NULL;
if (*found_section)
return find_section;
if (be_quiet)
return NULL;
else
return (char *)" - ";
}
/* scan an elf file and show all the fun stuff */
#define prints(str) write(fileno(stdout), str, strlen(str))
static int scanelf_elfobj(elfobj *elf)
{
unsigned long i;
char found_pax, found_phdr, found_relro, found_load, found_textrel,
found_rpath, found_needed, found_interp, found_bind, found_soname,
found_sym, found_lib, found_file, found_textrels, found_section;
static char *out_buffer = NULL;
static size_t out_len;
found_pax = found_phdr = found_relro = found_load = found_textrel = \
found_rpath = found_needed = found_interp = found_bind = found_soname = \
found_sym = found_lib = found_file = found_textrels = found_section = 0;
if (be_verbose > 2)
printf("%s: scanning file {%s,%s}\n", elf->filename,
get_elfeitype(EI_CLASS, elf->elf_class),
get_elfeitype(EI_DATA, elf->data[EI_DATA]));
else if (be_verbose > 1)
printf("%s: scanning file\n", elf->filename);
/* init output buffer */
if (!out_buffer) {
out_len = sizeof(char) * 80;
out_buffer = (char*)xmalloc(out_len);
}
*out_buffer = '\0';
/* show the header */
if (!be_quiet && show_banner) {
for (i = 0; out_format[i]; ++i) {
if (!IS_MODIFIER(out_format[i])) continue;
switch (out_format[++i]) {
case '+': break;
case '%': break;
case '#': break;
case 'F':
case 'p':
case 'f': prints("FILE "); found_file = 1; break;
case 'o': prints(" TYPE "); break;
case 'x': prints(" PAX "); break;
case 'e': prints("STK/REL/PTL "); break;
case 't': prints("TEXTREL "); break;
case 'r': prints("RPATH "); break;
case 'n': prints("NEEDED "); break;
case 'i': prints("INTERP "); break;
case 'b': prints("BIND "); break;
case 'S': prints("SONAME "); break;
case 's': prints("SYM "); break;
case 'N': prints("LIB "); break;
case 'T': prints("TEXTRELS "); break;
case 'k': prints("SECTION "); break;
case 'a': prints("ARCH "); break;
default: warnf("'%c' has no title ?", out_format[i]);
}
}
if (!found_file) prints("FILE ");
prints("\n");
found_file = 0;
show_banner = 0;
}
/* dump all the good stuff */
for (i = 0; out_format[i]; ++i) {
const char *out;
const char *tmp;
if (!IS_MODIFIER(out_format[i])) {
xchrcat(&out_buffer, out_format[i], &out_len);
continue;
}
out = NULL;
be_wewy_wewy_quiet = (out_format[i] == '#');
be_semi_verbose = (out_format[i] == '+');
switch (out_format[++i]) {
case '+':
case '%':
case '#':
xchrcat(&out_buffer, out_format[i], &out_len); break;
case 'F':
found_file = 1;
if (be_wewy_wewy_quiet) break;
xstrcat(&out_buffer, elf->filename, &out_len);
break;
case 'p':
found_file = 1;
if (be_wewy_wewy_quiet) break;
tmp = elf->filename;
if (search_path) {
ssize_t len_search = strlen(search_path);
ssize_t len_file = strlen(elf->filename);
if (!strncmp(elf->filename, search_path, len_search) && \
len_file > len_search)
tmp += len_search;
if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
}
xstrcat(&out_buffer, tmp, &out_len);
break;
case 'f':
found_file = 1;
if (be_wewy_wewy_quiet) break;
tmp = strrchr(elf->filename, '/');
tmp = (tmp == NULL ? elf->filename : tmp+1);
xstrcat(&out_buffer, tmp, &out_len);
break;
case 'o': out = get_elfetype(elf); break;
case 'x': out = scanelf_file_pax(elf, &found_pax); break;
case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
case 'n':
case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
case 'i': out = scanelf_file_interp(elf, &found_interp); break;
case 'b': out = scanelf_file_bind(elf, &found_bind); break;
case 'S': out = scanelf_file_soname(elf, &found_soname); break;
case 's': out = scanelf_file_sym(elf, &found_sym); break;
case 'k': out = scanelf_file_sections(elf, &found_section); break;
case 'a': out = get_elfemtype(elf); break;
default: warnf("'%c' has no scan code?", out_format[i]);
}
if (out) {
/* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
xstrncat(&out_buffer, out, &out_len, (tmp-out));
else
xstrcat(&out_buffer, out, &out_len);
}
}
#define FOUND_SOMETHING() \
(found_pax || found_phdr || found_relro || found_load || found_textrel || \
found_rpath || found_needed || found_interp || found_bind || \
found_soname || found_sym || found_lib || found_textrels || found_section )
if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
xchrcat(&out_buffer, ' ', &out_len);
xstrcat(&out_buffer, elf->filename, &out_len);
}
if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
puts(out_buffer);
fflush(stdout);
}
return 0;
}
/* scan a single elf */
static int scanelf_elf(const char *filename, int fd, size_t len)
{
int ret = 1;
elfobj *elf;
/* verify this is real ELF */
if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
if (be_verbose > 2) printf("%s: not an ELF\n", filename);
return ret;
}
switch (match_bits) {
case 32:
if (elf->elf_class != ELFCLASS32)
goto label_done;
break;
case 64:
if (elf->elf_class != ELFCLASS64)
goto label_done;
break;
default: break;
}
if (strlen(match_etypes)) {
char sbuf[126];
strncpy(sbuf, match_etypes, sizeof(sbuf));
if (strchr(match_etypes, ',') != NULL) {
char *p;
while((p = strrchr(sbuf, ',')) != NULL) {
*p = 0;
if (etype_lookup(p+1) == get_etype(elf))
goto label_ret;
}
}
if (etype_lookup(sbuf) != get_etype(elf))
goto label_done;
}
label_ret:
ret = scanelf_elfobj(elf);
label_done:
unreadelf(elf);
return ret;
}
/* scan an archive of elfs */
static int scanelf_archive(const char *filename, int fd, size_t len)
{
archive_handle *ar;
archive_member *m;
char *ar_buffer;
elfobj *elf;
ar = ar_open_fd(filename, fd);
if (ar == NULL)
return 1;
ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
while ((m=ar_next(ar)) != NULL) {
elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
if (elf) {
scanelf_elfobj(elf);
unreadelf(elf);
}
}
munmap(ar_buffer, len);
return 0;
}
/* scan a file which may be an elf or an archive or some other magical beast */
static int scanelf_file(const char *filename, const struct stat *st_cache)
{
const struct stat *st = st_cache;
struct stat symlink_st;
int fd;
/* always handle regular files and handle symlinked files if no -y */
if (S_ISLNK(st->st_mode)) {
if (!scan_symlink) return 1;
stat(filename, &symlink_st);
st = &symlink_st;
}
if (!S_ISREG(st->st_mode)) {
if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
return 1;
}
if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
return 1;
if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
/* if it isn't an ELF, maybe it's an .a archive */
scanelf_archive(filename, fd, st->st_size);
close(fd);
return 0;
}
/* scan a directory for ET_EXEC files and print when we find one */
static int scanelf_dir(const char *path)
{
register DIR *dir;
register struct dirent *dentry;
struct stat st_top, st;
char buf[__PAX_UTILS_PATH_MAX];
size_t pathlen = 0, len = 0;
int ret = 0;
/* make sure path exists */
if (lstat(path, &st_top) == -1) {
if (be_verbose > 2) printf("%s: does not exist\n", path);
return 1;
}
/* ok, if it isn't a directory, assume we can open it */
if (!S_ISDIR(st_top.st_mode)) {
return scanelf_file(path, &st_top);
}
/* now scan the dir looking for fun stuff */
if ((dir = opendir(path)) == NULL) {
warnf("could not opendir %s: %s", path, strerror(errno));
return 1;
}
if (be_verbose > 1) printf("%s: scanning dir\n", path);
pathlen = strlen(path);
while ((dentry = readdir(dir))) {
if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
continue;
len = (pathlen + 1 + strlen(dentry->d_name) + 1);
if (len >= sizeof(buf)) {
warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
(unsigned long)len, (unsigned long)sizeof(buf));
continue;
}
snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
if (lstat(buf, &st) != -1) {
if (S_ISREG(st.st_mode))
ret = scanelf_file(buf, &st);
else if (dir_recurse && S_ISDIR(st.st_mode)) {
if (dir_crossmount || (st_top.st_dev == st.st_dev))
ret = scanelf_dir(buf);
}
}
}
closedir(dir);
return ret;
}
static int scanelf_from_file(const char *filename)
{
FILE *fp = NULL;
char *p;
char path[__PAX_UTILS_PATH_MAX];
int ret = 0;
if (strcmp(filename, "-") == 0)
fp = stdin;
else if ((fp = fopen(filename, "r")) == NULL)
return 1;
while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
if ((p = strchr(path, '\n')) != NULL)
*p = 0;
search_path = path;
ret = scanelf_dir(path);
}
if (fp != stdin)
fclose(fp);
return ret;
}
#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
static int load_ld_cache_config(int i, const char *fname)
{
FILE *fp = NULL;
char *p;
char path[__PAX_UTILS_PATH_MAX];
if (i + 1 == ARRAY_SIZE(ldpaths))
return i;
if ((fp = fopen(fname, "r")) == NULL)
return i;
while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
if ((p = strrchr(path, '\r')) != NULL)
*p = 0;
if ((p = strchr(path, '\n')) != NULL)
*p = 0;
#ifdef __linux__
// recursive includes of the same file will make this segfault.
if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
glob64_t gl;
size_t x;
char gpath[__PAX_UTILS_PATH_MAX];
memset(gpath, 0, sizeof(gpath));
if (path[8] != '/')
snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
else
strncpy(gpath, &path[8], sizeof(gpath));
if ((glob64(gpath, 0, NULL, &gl)) == 0) {
for (x = 0; x < gl.gl_pathc; ++x) {
/* try to avoid direct loops */
if (strcmp(gl.gl_pathv[x], fname) == 0)
continue;
i = load_ld_cache_config(i, gl.gl_pathv[x]);
if (i + 1 >= ARRAY_SIZE(ldpaths)) {
globfree64(&gl);
return i;
}
}
globfree64 (&gl);
continue;
}
}
#endif
if (*path != '/')
continue;
ldpaths[i++] = xstrdup(path);
if (i + 1 == ARRAY_SIZE(ldpaths))
break;
}
ldpaths[i] = NULL;
fclose(fp);
return i;
}
#elif defined(__FreeBSD__) || (__DragonFly__)
static int load_ld_cache_config(int i, const char *fname)
{
FILE *fp = NULL;
char *b = NULL, *p;
struct elfhints_hdr hdr;
if (i + 1 == ARRAY_SIZE(ldpaths))
return i;
if ((fp = fopen(fname, "r")) == NULL)
return i;
if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
{
fclose(fp);
return i;
}
b = (char*)malloc(hdr.dirlistlen+1);
if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
fclose(fp);
free(b);
return i;
}
while ((p = strsep(&b, ":"))) {
if (*p == '\0') continue;
ldpaths[i++] = xstrdup(p);
if (i + 1 == ARRAY_SIZE(ldpaths))
break;
}
ldpaths[i] = NULL;
free(b);
fclose(fp);
return i;
}
#else
#warning Cache config support not implemented for your target
static int load_ld_cache_config(int i, const char *fname)
{
memset(ldpaths, 0x00, sizeof(ldpaths));
}
#endif
/* scan /etc/ld.so.conf for paths */
static void scanelf_ldpath()
{
char scan_l, scan_ul, scan_ull;
int i = 0;
if (!ldpaths[0])
err("Unable to load any paths from ld.so.conf");
scan_l = scan_ul = scan_ull = 0;
while (ldpaths[i]) {
if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
scanelf_dir(ldpaths[i]);
++i;
}
if (!scan_l) scanelf_dir("/lib");
if (!scan_ul) scanelf_dir("/usr/lib");
if (!scan_ull) scanelf_dir("/usr/local/lib");
}
/* scan env PATH for paths */
static void scanelf_envpath()
{
char *path, *p;
path = getenv("PATH");
if (!path)
err("PATH is not set in your env !");
path = xstrdup(path);
while ((p = strrchr(path, ':')) != NULL) {
scanelf_dir(p + 1);
*p = 0;
}
free(path);
}
/* usage / invocation handling functions */
#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
#define a_argument required_argument
static struct option const long_opts[] = {
{"path", no_argument, NULL, 'p'},
{"ldpath", no_argument, NULL, 'l'},
{"recursive", no_argument, NULL, 'R'},
{"mount", no_argument, NULL, 'm'},
{"symlink", no_argument, NULL, 'y'},
{"archives", no_argument, NULL, 'A'},
{"ldcache", no_argument, NULL, 'L'},
{"fix", no_argument, NULL, 'X'},
{"setpax", a_argument, NULL, 'z'},
{"pax", no_argument, NULL, 'x'},
{"header", no_argument, NULL, 'e'},
{"textrel", no_argument, NULL, 't'},
{"rpath", no_argument, NULL, 'r'},
{"needed", no_argument, NULL, 'n'},
{"interp", no_argument, NULL, 'i'},
{"bind", no_argument, NULL, 'b'},
{"soname", no_argument, NULL, 'S'},
{"symbol", a_argument, NULL, 's'},
{"section", a_argument, NULL, 'k'},
{"lib", a_argument, NULL, 'N'},
{"gmatch", no_argument, NULL, 'g'},
{"textrels", no_argument, NULL, 'T'},
{"etype", a_argument, NULL, 'E'},
{"bits", a_argument, NULL, 'M'},
{"all", no_argument, NULL, 'a'},
{"quiet", no_argument, NULL, 'q'},
{"verbose", no_argument, NULL, 'v'},
{"format", a_argument, NULL, 'F'},
{"from", a_argument, NULL, 'f'},
{"file", a_argument, NULL, 'o'},
{"nobanner", no_argument, NULL, 'B'},
{"help", no_argument, NULL, 'h'},
{"version", no_argument, NULL, 'V'},
{NULL, no_argument, NULL, 0x0}
};
static const char *opts_help[] = {
"Scan all directories in PATH environment",
"Scan all directories in /etc/ld.so.conf",
"Scan directories recursively",
"Don't recursively cross mount points",
"Don't scan symlinks",
"Scan archives (.a files)",
"Utilize ld.so.cache information (use with -r/-n)",
"Try and 'fix' bad things (use with -r/-e)",
"Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
"Print PaX markings",
"Print GNU_STACK/PT_LOAD markings",
"Print TEXTREL information",
"Print RPATH information",
"Print NEEDED information",
"Print INTERP information",
"Print BIND information",
"Print SONAME information",
"Find a specified symbol",
"Find a specified section",
"Find a specified library",
"Use strncmp to match libraries. (use with -N)",
"Locate cause of TEXTREL",
"Print only ELF files matching etype ET_DYN,ET_EXEC ...",
"Print only ELF files matching numeric bits",
"Print all scanned info (-x -e -t -r -b)\n",
"Only output 'bad' things",
"Be verbose (can be specified more than once)",
"Use specified format for output",
"Read input stream from a filename",
"Write output stream to a filename",
"Don't display the header",
"Print this help and exit",
"Print version and exit",
NULL
};
/* display usage and exit */
static void usage(int status)
{
unsigned long i;
printf("* Scan ELF binaries for stuff\n\n"
"Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
printf("Options: -[%s]\n", PARSE_FLAGS);
for (i = 0; long_opts[i].name; ++i)
if (long_opts[i].has_arg == no_argument)
printf(" -%c, --%-14s* %s\n", long_opts[i].val,
long_opts[i].name, opts_help[i]);
else
printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
long_opts[i].name, opts_help[i]);
if (status != EXIT_SUCCESS)
exit(status);
puts("\nThe format modifiers for the -F option are:");
puts(" F Filename \tx PaX Flags \te STACK/RELRO");
puts(" t TEXTREL \tr RPATH \tn NEEDED");
puts(" i INTERP \tb BIND \ts symbol");
puts(" N library \to Type \tT TEXTRELs");
puts(" S SONAME \tk section \ta arch");
puts(" p filename (with search path removed)");
puts(" f filename (short name/basename)");
puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
puts("\nELF Etypes:");
print_etypes(stdout);
exit(status);
}
/* parse command line arguments and preform needed actions */
#define do_pax_state(option, flag) \
if (islower(option)) { \
flags &= ~PF_##flag; \
flags |= PF_NO##flag; \
} else { \
flags &= ~PF_NO##flag; \
flags |= PF_##flag; \
}
static int parseargs(int argc, char *argv[])
{
int i;
const char *from_file = NULL;
int ret = 0;
opterr = 0;
while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
switch (i) {
case 'V':
printf("pax-utils-%s: %s compiled %s\n%s\n"
"%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
VERSION, __FILE__, __DATE__, rcsid, argv0);
exit(EXIT_SUCCESS);
break;
case 'h': usage(EXIT_SUCCESS); break;
case 'f':
if (from_file) warn("You prob don't want to specify -f twice");
from_file = optarg;
break;
case 'E':
strncpy(match_etypes, optarg, sizeof(match_etypes));
break;
case 'M':
match_bits = atoi(optarg);
break;
case 'o': {
if (freopen(optarg, "w", stdout) == NULL)
err("Could not open output stream '%s': %s", optarg, strerror(errno));
break;
}
case 'k':
if (find_section) warn("You prob don't want to specify -k twice");
find_section = optarg;
break;
case 's': {
if (find_sym) warn("You prob don't want to specify -s twice");
find_sym = optarg;
versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
sprintf(versioned_symname, "%s@", find_sym);
break;
}
case 'N': {
if (find_lib) warn("You prob don't want to specify -N twice");
find_lib = optarg;
break;
}
case 'F': {
if (out_format) warn("You prob don't want to specify -F twice");
out_format = optarg;
break;
}
case 'z': {
unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
size_t x;
for (x = 0 ; x < strlen(optarg); x++) {
switch(optarg[x]) {
case 'p':
case 'P':
do_pax_state(optarg[x], PAGEEXEC);
break;
case 's':
case 'S':
do_pax_state(optarg[x], SEGMEXEC);
break;
case 'm':
case 'M':
do_pax_state(optarg[x], MPROTECT);
break;
case 'e':
case 'E':
do_pax_state(optarg[x], EMUTRAMP);
break;
case 'r':
case 'R':
do_pax_state(optarg[x], RANDMMAP);
break;
case 'x':
case 'X':
do_pax_state(optarg[x], RANDEXEC);
break;
default:
break;
}
}
if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
setpax = flags;
break;
}
case 'g': gmatch = 1; break;
case 'L': use_ldcache = 1; break;
case 'y': scan_symlink = 0; break;
case 'A': scan_archives = 1; break;
case 'B': show_banner = 0; break;
case 'l': scan_ldpath = 1; break;
case 'p': scan_envpath = 1; break;
case 'R': dir_recurse = 1; break;
case 'm': dir_crossmount = 0; break;
case 'X': ++fix_elf; break;
case 'x': show_pax = 1; break;
case 'e': show_phdr = 1; break;
case 't': show_textrel = 1; break;
case 'r': show_rpath = 1; break;
case 'n': show_needed = 1; break;
case 'i': show_interp = 1; break;
case 'b': show_bind = 1; break;
case 'S': show_soname = 1; break;
case 'T': show_textrels = 1; break;
case 'q': be_quiet = 1; break;
case 'v': be_verbose = (be_verbose % 20) + 1; break;
case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
case ':':
err("Option '%c' is missing parameter", optopt);
case '?':
err("Unknown option '%c' or argument missing", optopt);
default:
err("Unhandled option '%c'; please report this", i);
}
}
/* let the format option override all other options */
if (out_format) {
show_pax = show_phdr = show_textrel = show_rpath = \
show_needed = show_interp = show_bind = show_soname = \
show_textrels = 0;
for (i = 0; out_format[i]; ++i) {
if (!IS_MODIFIER(out_format[i])) continue;
switch (out_format[++i]) {
case '+': break;
case '%': break;
case '#': break;
case 'F': break;
case 'p': break;
case 'f': break;
case 'k': break;
case 's': break;
case 'N': break;
case 'o': break;
case 'a': break;
case 'x': show_pax = 1; break;
case 'e': show_phdr = 1; break;
case 't': show_textrel = 1; break;
case 'r': show_rpath = 1; break;
case 'n': show_needed = 1; break;
case 'i': show_interp = 1; break;
case 'b': show_bind = 1; break;
case 'S': show_soname = 1; break;
case 'T': show_textrels = 1; break;
default:
err("Invalid format specifier '%c' (byte %i)",
out_format[i], i+1);
}
}
/* construct our default format */
} else {
size_t fmt_len = 30;
out_format = (char*)xmalloc(sizeof(char) * fmt_len);
if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
}
if (be_verbose > 2) printf("Format: %s\n", out_format);
/* now lets actually do the scanning */
if (scan_ldpath || use_ldcache)
load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
if (scan_ldpath) scanelf_ldpath();
if (scan_envpath) scanelf_envpath();
if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
from_file = "-";
if (from_file) {
scanelf_from_file(from_file);
from_file = *argv;
}
if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
err("Nothing to scan !?");
while (optind < argc) {
search_path = argv[optind++];
ret = scanelf_dir(search_path);
}
/* clean up */
free(versioned_symname);
for (i = 0; ldpaths[i]; ++i)
free(ldpaths[i]);
if (ldcache != 0)
munmap(ldcache, ldcache_size);
return ret;
}
static char **get_split_env(const char *envvar)
{
const char *delims = " \t\n";
char **envvals = NULL;
char *env, *s;
int nentry;
if ((env = getenv(envvar)) == NULL)
return NULL;
env = xstrdup(env);
if (env == NULL)
return NULL;
s = strtok(env, delims);
if (s == NULL) {
free(env);
return NULL;
}
nentry = 0;
while (s != NULL) {
++nentry;
envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
envvals[nentry-1] = s;
s = strtok(NULL, delims);
}
envvals[nentry] = NULL;
/* don't want to free(env) as it contains the memory that backs
* the envvals array of strings */
return envvals;
}
static void parseenv()
{
qa_textrels = get_split_env("QA_TEXTRELS");
qa_execstack = get_split_env("QA_EXECSTACK");
qa_wx_load = get_split_env("QA_WX_LOAD");
}
#ifdef __PAX_UTILS_CLEANUP
static void cleanup()
{
free(out_format);
free(qa_textrels);
free(qa_execstack);
free(qa_wx_load);
}
#endif
int main(int argc, char *argv[])
{
int ret;
if (argc < 2)
usage(EXIT_FAILURE);
parseenv();
ret = parseargs(argc, argv);
fclose(stdout);
#ifdef __PAX_UTILS_CLEANUP
cleanup();
warn("The calls to add/delete heap should be off:\n"
"\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
"\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
#endif
return ret;
}
/* utility funcs */
static char *xstrdup(const char *s)
{
char *ret = strdup(s);
if (!ret) err("Could not strdup(): %s", strerror(errno));
return ret;
}
static void *xmalloc(size_t size)
{
void *ret = malloc(size);
if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
return ret;
}
static void *xrealloc(void *ptr, size_t size)
{
void *ret = realloc(ptr, size);
if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
return ret;
}
static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
{
size_t new_len;
new_len = strlen(*dst) + strlen(src);
if (*curr_len <= new_len) {
*curr_len = new_len + (*curr_len / 2);
*dst = realloc(*dst, *curr_len);
if (!*dst)
err("could not realloc() %li bytes", (unsigned long)*curr_len);
}
if (n)
strncat(*dst, src, n);
else
strcat(*dst, src);
}
static inline void xchrcat(char **dst, const char append, size_t *curr_len)
{
static char my_app[2];
my_app[0] = append;
my_app[1] = '\0';
xstrcat(dst, my_app, curr_len);
}
/* Match filename against entries in matchlist, return TRUE
* if the file is listed */
static int file_matches_list(const char *filename, char **matchlist)
{
char **file;
char *match;
char buf[__PAX_UTILS_PATH_MAX];
if (matchlist == NULL)
return 0;
for (file = matchlist; *file != NULL; file++) {
if (search_path) {
snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
match = buf;
} else {
match = *file;
}
if (fnmatch(match, filename, 0) == 0)
return 1;
}
return 0;
}
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