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[libbacktrace] Fix .gnu_debugaltlink build-id check

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The 'debugaltlink_name_len =+ 1' bug reported in PR89136 exposes the fact that
the build-id is not verified for the .gnu_debugaltlink.

Fix both problems.

2019-01-31  Tom de Vries  <tdevries@suse.de>

	PR libbacktrace/89136
	* elf.c (elf_add): Read build-id if with_buildid_data.  Fix
	'debugaltlink_name_len =+ 1'.

From-SVN: r268419
This commit is contained in:
Tom de Vries 2019-01-31 12:17:32 +00:00 committed by Tom de Vries
parent 7ad97d1777
commit 3a3f5dd1af
2 changed files with 8 additions and 2 deletions
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6
libbacktrace/ChangeLog
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@ -1,3 +1,9 @@
2019-01-31 Tom de Vries <tdevries@suse.de>
PR libbacktrace/89136
* elf.c (elf_add): Read build-id if with_buildid_data. Fix
'debugaltlink_name_len =+ 1'.
2019-01-29 Tom de Vries <tdevries@suse.de>
* install-debuginfo-for-buildid.sh.in: New script.

4
libbacktrace/elf.c
View File

@ -2864,7 +2864,7 @@ elf_add (struct backtrace_state *state, const char *filename, int descriptor,
/* Read the build ID if present. This could check for any
SHT_NOTE section with the right note name and type, but gdb
looks for a specific section name. */
if (!debuginfo
if ((!debuginfo || with_buildid_data != NULL)
&& !buildid_view_valid
&& strcmp (name, ".note.gnu.build-id") == 0)
{
@ -2938,7 +2938,7 @@ elf_add (struct backtrace_state *state, const char *filename, int descriptor,
if (debugaltlink_name_len < shdr->sh_size)
{
/* Include terminating zero. */
debugaltlink_name_len =+ 1;
debugaltlink_name_len += 1;
debugaltlink_buildid_data
= debugaltlink_data + debugaltlink_name_len;