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| author | Siddhesh Poyarekar <siddhesh@sourceware.org> | 2017-03-07 20:52:04 +0530 |
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| committer | Siddhesh Poyarekar <siddhesh@sourceware.org> | 2017-03-07 20:52:04 +0530 |
| commit | 1c1243b6fc33c029488add276e56570a07803bfd (patch) | |
| tree | dc024978a5a16a4bd027a4f28508ab503983fa6c /time | |
| parent | a7055e5935f7ee63d622c66a7dde16ba0de674e0 (diff) | |
| download | glibc-1c1243b6fc33c029488add276e56570a07803bfd.tar.gz glibc-1c1243b6fc33c029488add276e56570a07803bfd.tar.xz glibc-1c1243b6fc33c029488add276e56570a07803bfd.zip | |
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 For AT_SECURE process it means that if an outdated routine has a bug that would otherwise not affect newer platforms by default, LD_HWCAP_MASK will allow that bug to be exploited.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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