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[BZ #4131]
2007-05-06 Ulrich Drepper <drepper@redhat.com> [BZ #4131] * elf/dl-addr.c (_dl_addr): Compare address with actual segment boundaries to work around systems with overlapping binary loading. Based on a patch by Suzuki <suzuki@in.ibm.com>.
This commit is contained in:
Ulrich Drepper
parent
30b323ab4e
commit
ffecd39b9c
@ -1,3 +1,10 @@
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2007-05-06 Ulrich Drepper <drepper@redhat.com>
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[BZ #4131]
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* elf/dl-addr.c (_dl_addr): Compare address with actual segment
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boundaries to work around systems with overlapping binary loading.
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Based on a patch by Suzuki <suzuki@in.ibm.com>.
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2007-05-04 Ulrich Drepper <drepper@redhat.com>
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* stdio-common/vfprintf.c (process_string_arg): Adjust call to
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230
elf/dl-addr.c
230
elf/dl-addr.c
@ -1,5 +1,5 @@
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/* Locate the shared object symbol nearest a given address.
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Copyright (C) 1996-2004, 2005, 2006 Free Software Foundation, Inc.
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Copyright (C) 1996-2004, 2005, 2006, 2007 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -22,137 +22,137 @@
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#include <ldsodefs.h>
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static void
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__attribute ((always_inline))
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determine_info (const ElfW(Addr) addr, struct link_map *match, Dl_info *info,
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struct link_map **mapp, const ElfW(Sym) **symbolp)
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{
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/* Now we know what object the address lies in. */
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info->dli_fname = match->l_name;
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info->dli_fbase = (void *) match->l_map_start;
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/* If this is the main program the information is incomplete. */
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if (__builtin_expect (match->l_name[0], 'a') == '\0'
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&& match->l_type == lt_executable)
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info->dli_fname = _dl_argv[0];
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const ElfW(Sym) *symtab
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= (const ElfW(Sym) *) D_PTR (match, l_info[DT_SYMTAB]);
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const char *strtab = (const char *) D_PTR (match, l_info[DT_STRTAB]);
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ElfW(Word) strtabsize = match->l_info[DT_STRSZ]->d_un.d_val;
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const ElfW(Sym) *matchsym = NULL;
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if (match->l_info[DT_ADDRTAGIDX (DT_GNU_HASH) + DT_NUM + DT_THISPROCNUM
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+ DT_VERSIONTAGNUM + DT_EXTRANUM + DT_VALNUM] != NULL)
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{
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/* We look at all symbol table entries referenced by the hash
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table. */
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for (Elf_Symndx bucket = 0; bucket < match->l_nbuckets; ++bucket)
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{
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Elf32_Word symndx = match->l_gnu_buckets[bucket];
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if (symndx != 0)
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{
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const Elf32_Word *hasharr = &match->l_gnu_chain_zero[symndx];
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do
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{
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/* The hash table never references local symbols so
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we can omit that test here. */
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if ((symtab[symndx].st_shndx != SHN_UNDEF
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|| symtab[symndx].st_value != 0)
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&& ELFW(ST_TYPE) (symtab[symndx].st_info) != STT_TLS
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&& DL_ADDR_SYM_MATCH (match, &symtab[symndx],
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matchsym, addr)
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&& symtab[symndx].st_name < strtabsize)
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matchsym = (ElfW(Sym) *) &symtab[symndx];
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++symndx;
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}
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while ((*hasharr++ & 1u) == 0);
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}
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}
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}
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else
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{
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const ElfW(Sym) *symtabend;
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if (match->l_info[DT_HASH] != NULL)
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symtabend = (symtab
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+ ((Elf_Symndx *) D_PTR (match, l_info[DT_HASH]))[1]);
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else
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/* There is no direct way to determine the number of symbols in the
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dynamic symbol table and no hash table is present. The ELF
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binary is ill-formed but what shall we do? Use the beginning of
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the string table which generally follows the symbol table. */
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symtabend = (const ElfW(Sym) *) strtab;
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for (; (void *) symtab < (void *) symtabend; ++symtab)
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if ((ELFW(ST_BIND) (symtab->st_info) == STB_GLOBAL
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|| ELFW(ST_BIND) (symtab->st_info) == STB_WEAK)
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&& ELFW(ST_TYPE) (symtab->st_info) != STT_TLS
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&& (symtab->st_shndx != SHN_UNDEF
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|| symtab->st_value != 0)
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&& DL_ADDR_SYM_MATCH (match, symtab, matchsym, addr)
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&& symtab->st_name < strtabsize)
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matchsym = (ElfW(Sym) *) symtab;
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}
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if (mapp)
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*mapp = match;
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if (symbolp)
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*symbolp = matchsym;
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if (matchsym)
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{
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/* We found a symbol close by. Fill in its name and exact
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address. */
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lookup_t matchl = LOOKUP_VALUE (match);
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info->dli_sname = strtab + matchsym->st_name;
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info->dli_saddr = DL_SYMBOL_ADDRESS (matchl, matchsym);
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}
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else
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{
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/* No symbol matches. We return only the containing object. */
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info->dli_sname = NULL;
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info->dli_saddr = NULL;
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}
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}
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int
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internal_function
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_dl_addr (const void *address, Dl_info *info,
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struct link_map **mapp, const ElfW(Sym) **symbolp)
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{
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const ElfW(Addr) addr = DL_LOOKUP_ADDRESS (address);
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int result = 0;
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/* Protect against concurrent loads and unloads. */
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__rtld_lock_lock_recursive (GL(dl_load_lock));
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/* Find the highest-addressed object that ADDRESS is not below. */
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struct link_map *match = NULL;
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for (Lmid_t ns = 0; ns < DL_NNS; ++ns)
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for (struct link_map *l = GL(dl_ns)[ns]._ns_loaded; l; l = l->l_next)
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if (addr >= l->l_map_start && addr < l->l_map_end)
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{
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/* We know ADDRESS lies within L if in any shared object.
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Make sure it isn't past the end of L's segments. */
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size_t n = l->l_phnum;
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if (n > 0)
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{
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do
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--n;
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while (l->l_phdr[n].p_type != PT_LOAD);
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if (addr >= (l->l_addr +
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l->l_phdr[n].p_vaddr + l->l_phdr[n].p_memsz))
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/* Off the end of the highest-addressed shared object. */
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continue;
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}
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match = l;
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break;
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/* Make sure it lies within one of L's segments. */
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int n = l->l_phnum;
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const ElfW(Addr) reladdr = addr - l->l_addr;
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while (--n >= 0)
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if (l->l_phdr[n].p_type == PT_LOAD)
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{
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if (reladdr - l->l_phdr[n].p_vaddr >= 0
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&& reladdr - l->l_phdr[n].p_vaddr < l->l_phdr[n].p_memsz)
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{
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determine_info (addr, l, info, mapp, symbolp);
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result = 1;
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goto out;
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}
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}
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}
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int result = 0;
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if (match != NULL)
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{
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/* Now we know what object the address lies in. */
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info->dli_fname = match->l_name;
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info->dli_fbase = (void *) match->l_map_start;
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/* If this is the main program the information is incomplete. */
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if (__builtin_expect (match->l_name[0], 'a') == '\0'
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&& match->l_type == lt_executable)
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info->dli_fname = _dl_argv[0];
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const ElfW(Sym) *symtab
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= (const ElfW(Sym) *) D_PTR (match, l_info[DT_SYMTAB]);
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const char *strtab = (const char *) D_PTR (match, l_info[DT_STRTAB]);
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ElfW(Word) strtabsize = match->l_info[DT_STRSZ]->d_un.d_val;
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const ElfW(Sym) *matchsym = NULL;
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if (match->l_info[DT_ADDRTAGIDX (DT_GNU_HASH) + DT_NUM + DT_THISPROCNUM
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+ DT_VERSIONTAGNUM + DT_EXTRANUM + DT_VALNUM] != NULL)
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{
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/* We look at all symbol table entries referenced by the
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hash table. */
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for (Elf_Symndx bucket = 0; bucket < match->l_nbuckets; ++bucket)
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{
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Elf32_Word symndx = match->l_gnu_buckets[bucket];
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if (symndx != 0)
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{
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const Elf32_Word *hasharr = &match->l_gnu_chain_zero[symndx];
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do
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{
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/* The hash table never references local symbols
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so we can omit that test here. */
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if ((symtab[symndx].st_shndx != SHN_UNDEF
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|| symtab[symndx].st_value != 0)
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&& ELFW(ST_TYPE) (symtab[symndx].st_info) != STT_TLS
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&& DL_ADDR_SYM_MATCH (match, &symtab[symndx],
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matchsym, addr)
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&& symtab[symndx].st_name < strtabsize)
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matchsym = (ElfW(Sym) *) &symtab[symndx];
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++symndx;
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}
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while ((*hasharr++ & 1u) == 0);
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}
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}
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}
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else
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{
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const ElfW(Sym) *symtabend;
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if (match->l_info[DT_HASH] != NULL)
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symtabend = (symtab
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+ ((Elf_Symndx *) D_PTR (match, l_info[DT_HASH]))[1]);
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else
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/* There is no direct way to determine the number of symbols in the
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dynamic symbol table and no hash table is present. The ELF
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binary is ill-formed but what shall we do? Use the beginning of
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the string table which generally follows the symbol table. */
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symtabend = (const ElfW(Sym) *) strtab;
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for (; (void *) symtab < (void *) symtabend; ++symtab)
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if ((ELFW(ST_BIND) (symtab->st_info) == STB_GLOBAL
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|| ELFW(ST_BIND) (symtab->st_info) == STB_WEAK)
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&& ELFW(ST_TYPE) (symtab->st_info) != STT_TLS
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&& (symtab->st_shndx != SHN_UNDEF
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|| symtab->st_value != 0)
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&& DL_ADDR_SYM_MATCH (match, symtab, matchsym, addr)
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&& symtab->st_name < strtabsize)
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matchsym = (ElfW(Sym) *) symtab;
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}
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if (mapp)
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*mapp = match;
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if (symbolp)
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*symbolp = matchsym;
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if (matchsym)
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{
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/* We found a symbol close by. Fill in its name and exact
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address. */
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lookup_t matchl = LOOKUP_VALUE (match);
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info->dli_sname = strtab + matchsym->st_name;
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info->dli_saddr = DL_SYMBOL_ADDRESS (matchl, matchsym);
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}
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else
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{
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/* No symbol matches. We return only the containing object. */
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info->dli_sname = NULL;
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info->dli_saddr = NULL;
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}
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result = 1;
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}
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out:
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__rtld_lock_unlock_recursive (GL(dl_load_lock));
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return result;
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