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libbacktrace: avoid infinite recursion

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We could get an infinite recursion in an odd case in which a
.gnu_debugdata section was added to a debug file, and mini_debuginfo
was put into the debug file, and the debug file was put into a
/usr/lib/debug directory to be found by build ID.  This combination
doesn't really make sense but we shouldn't get an infinite recursion.

	* elf.c (elf_add): Don't use .gnu_debugdata if we are already
	reading a debuginfo file.
	* Makefile.am (m2test_*): New test targets.
	(CHECK_PROGRAMS): Add m2test.
	(MAKETESTS): Add m2test_minidebug2.
	(%_minidebug2): New pattern.
	(CLEANFILES): Remove minidebug2 files.
	* Makefile.in: Regenerate.

Fixes #129
This commit is contained in:
Ian Lance Taylor
2024-07-11 19:36:00 -07:00
parent 1023a09511
commit febbb9bff9
3 changed files with 134 additions and 42 deletions
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3
elf.c
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@@ -6841,7 +6841,8 @@ elf_add (struct backtrace_state *state, const char *filename, int descriptor,
}
}
if (!gnu_debugdata_view_valid
if (!debuginfo
&& !gnu_debugdata_view_valid
&& strcmp (name, ".gnu_debugdata") == 0)
{
if (!elf_get_view (state, descriptor, memory, memory_size,