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Have dump_syms output the full symbol table.

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Some of the symbols in the stack trace are not found in the .dynsym
section but were located in the full symbol table .symtab section
instead. This was causing some of our stack traces to be incomplete or
point to incorrect function names.

Since we only output function names, there are actually not that many
more symbols located in .symtab that aren't in .dynsym. It is better to
simply output all symbols found so our stack traces are complete.

R=mark@chromium.org, thestig@chromium.org
BUG=561447

Review URL: https://codereview.chromium.org/1824063002 .

Patch from David Yen <dyen@chromium.org>.
This commit is contained in:
David Yen 2016-03-23 13:17:41 -04:00 committed by Mark Mentovai
parent 85b27e4a69
commit 512cac3a1b
1 changed files with 47 additions and 18 deletions
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65
src/common/linux/dump_symbols.cc
View File

@ -684,32 +684,61 @@ bool LoadSymbols(const string& obj_file,
}
// See if there are export symbols available.
const Shdr* dynsym_section =
FindElfSectionByName<ElfClass>(".dynsym", SHT_DYNSYM,
sections, names, names_end,
elf_header->e_shnum);
const Shdr* dynstr_section =
FindElfSectionByName<ElfClass>(".dynstr", SHT_STRTAB,
sections, names, names_end,
elf_header->e_shnum);
if (dynsym_section && dynstr_section) {
info->LoadedSection(".dynsym");
const Shdr* symtab_section =
FindElfSectionByName<ElfClass>(".symtab", SHT_SYMTAB,
sections, names, names_end,
elf_header->e_shnum);
const Shdr* strtab_section =
FindElfSectionByName<ElfClass>(".strtab", SHT_STRTAB,
sections, names, names_end,
elf_header->e_shnum);
if (symtab_section && strtab_section) {
info->LoadedSection(".symtab");
const uint8_t* dynsyms =
const uint8_t* symtab =
GetOffset<ElfClass, uint8_t>(elf_header,
dynsym_section->sh_offset);
const uint8_t* dynstrs =
symtab_section->sh_offset);
const uint8_t* strtab =
GetOffset<ElfClass, uint8_t>(elf_header,
dynstr_section->sh_offset);
strtab_section->sh_offset);
bool result =
ELFSymbolsToModule(dynsyms,
dynsym_section->sh_size,
dynstrs,
dynstr_section->sh_size,
ELFSymbolsToModule(symtab,
symtab_section->sh_size,
strtab,
strtab_section->sh_size,
big_endian,
ElfClass::kAddrSize,
module);
found_usable_info = found_usable_info || result;
} else {
// Look in dynsym only if full symbol table was not available.
const Shdr* dynsym_section =
FindElfSectionByName<ElfClass>(".dynsym", SHT_DYNSYM,
sections, names, names_end,
elf_header->e_shnum);
const Shdr* dynstr_section =
FindElfSectionByName<ElfClass>(".dynstr", SHT_STRTAB,
sections, names, names_end,
elf_header->e_shnum);
if (dynsym_section && dynstr_section) {
info->LoadedSection(".dynsym");
const uint8_t* dynsyms =
GetOffset<ElfClass, uint8_t>(elf_header,
dynsym_section->sh_offset);
const uint8_t* dynstrs =
GetOffset<ElfClass, uint8_t>(elf_header,
dynstr_section->sh_offset);
bool result =
ELFSymbolsToModule(dynsyms,
dynsym_section->sh_size,
dynstrs,
dynstr_section->sh_size,
big_endian,
ElfClass::kAddrSize,
module);
found_usable_info = found_usable_info || result;
}
}
}