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authorSiddhesh Poyarekar <siddhesh@sourceware.org>2017-03-07 20:52:04 +0530
committerSiddhesh Poyarekar <siddhesh@sourceware.org>2017-03-07 20:52:04 +0530
commit1c1243b6fc33c029488add276e56570a07803bfd (patch)
treedc024978a5a16a4bd027a4f28508ab503983fa6c /manual/conf.texi
parenta7055e5935f7ee63d622c66a7dde16ba0de674e0 (diff)
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Ignore and remove LD_HWCAP_MASK for AT_SECURE programs (bug #21209)
The LD_HWCAP_MASK environment variable may alter the selection of
function variants for some architectures.  For AT_SECURE process it
means that if an outdated routine has a bug that would otherwise not
affect newer platforms by default, LD_HWCAP_MASK will allow that bug
to be exploited.

To be on the safe side, ignore and disable LD_HWCAP_MASK for setuid
binaries.

	[BZ #21209]
	* elf/rtld.c (process_envvars): Ignore LD_HWCAP_MASK for
	AT_SECURE processes.
	* sysdeps/generic/unsecvars.h: Add LD_HWCAP_MASK.
	* elf/tst-env-setuid.c (test_parent): Test LD_HWCAP_MASK.
	(test_child): Likewise.
	* elf/Makefile (tst-env-setuid-ENV): Add LD_HWCAP_MASK.
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