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author | H.J. Lu <hjl.tools@gmail.com> | 2019-01-21 11:32:24 -0800 |
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committer | H.J. Lu <hjl.tools@gmail.com> | 2019-01-21 11:32:37 -0800 |
commit | 82d0b4a4d76db554eb6757acb790fcea30b19965 (patch) | |
tree | a3cb4225e0d8370936489c41be107825ba20a301 /sysdeps/x86_64/multiarch/strcmp-avx2.S | |
parent | ecd8b842cf37ea112e59cd9085ff1f1b6e208ae0 (diff) | |
download | glibc-82d0b4a4d76db554eb6757acb790fcea30b19965.tar.gz glibc-82d0b4a4d76db554eb6757acb790fcea30b19965.tar.xz glibc-82d0b4a4d76db554eb6757acb790fcea30b19965.zip |
x86-64 memset/wmemset: Properly handle the length parameter [BZ# 24097]
On x32, the size_t parameter may be passed in the lower 32 bits of a 64-bit register with the non-zero upper 32 bits. The string/memory functions written in assembly can only use the lower 32 bits of a 64-bit register as length or must clear the upper 32 bits before using the full 64-bit register for length. This pach fixes memset/wmemset for x32. Tested on x86-64 and x32. On x86-64, libc.so is the same with and withou the fix. [BZ# 24097] CVE-2019-6488 * sysdeps/x86_64/multiarch/memset-avx512-no-vzeroupper.S: Use RDX_LP for length. Clear the upper 32 bits of RDX register. * sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S: Likewise. * sysdeps/x86_64/x32/Makefile (tests): Add tst-size_t-wmemset. * sysdeps/x86_64/x32/tst-size_t-memset.c: New file. * sysdeps/x86_64/x32/tst-size_t-wmemset.c: Likewise.
Diffstat (limited to 'sysdeps/x86_64/multiarch/strcmp-avx2.S')
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