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Breakpad Linux dumper: STABS reader incorrectly assumes a single compilation unit

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The stabs reading code in google-breakpad incorrectly assumes that the
stabs data is a single compilation unit. Specifically, it ignores
N_UNDF stabs and assumes that all string indices are relative to the
beginning of the .stabstr section.

This is true when linking with the GNU linker by default, because the
GNU linker optimizes stabs debug info. The gold linker does not do
this optimization. It can be disabled when using the GNU linker with
the --traditional-format command line option.

For more details of the problem, see:

http://sourceware.org/bugzilla/show_bug.cgi?id=10338
http://code.google.com/p/google-breakpad/issues/detail?id=359

This patch adds unit tests that reproduce the failure, and fixes the
stabs parser.

a=jimblandy, r=nealsid


git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@490 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
jimblandy 2010-01-14 17:19:34 +00:00
parent 7b873221e6
commit 5251e64f48
3 changed files with 194 additions and 35 deletions
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7
src/common/linux/stabs_reader.h
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@ -96,6 +96,13 @@ class StabsReader {
StabsHandler *handler_;
// The offset of the current compilation unit's strings within stabstr_.
size_t string_offset_;
// The value string_offset_ should have for the next compilation unit,
// as established by N_UNDF entries.
size_t next_cu_string_offset_;
// The current symbol we're processing.
const struct nlist *symbol_;