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| author |   Noah Goldstein <goldstein.w.n@gmail.com> | 2022-02-15 20:27:21 -0600 |
|---|---|---|
| committer |   Andreas K. Hüttel <dilfridge@gentoo.org> | 2022-05-14 23:20:00 +0200 |
| commit | 91ca927bb0c3a158130d491fd07fb5c157deb68e (patch) | |
| tree | 72763ec7acb4153e50af250d88eb9e69ba29a4c6 /dlfcn/dlfcn.h | |
| parent | x86: Set .text section in memset-vec-unaligned-erms (diff) | |
| download | glibc-91ca927bb0c3a158130d491fd07fb5c157deb68e.tar.gz glibc-91ca927bb0c3a158130d491fd07fb5c157deb68e.tar.bz2 glibc-91ca927bb0c3a158130d491fd07fb5c157deb68e.zip | |
x86: Fix bug in strncmp-evex and strncmp-avx2 [BZ #28895]
Logic can read before the start of `s1` / `s2` if both `s1` and `s2`
are near the start of a page. To avoid having the result contimated by
these comparisons the `strcmp` variants would mask off these
comparisons. This was missing in the `strncmp` variants causing
the bug. This commit adds the masking to `strncmp` so that out of
range comparisons don't affect the result.
test-strcmp, test-strncmp, test-wcscmp, and test-wcsncmp all pass as
well a full xcheck on x86_64 linux.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
(cherry picked from commit e108c02a5e23c8c88ce66d8705d4a24bb6b9a8bf)
(cherry picked from commit 5373c90f2ea3c3fa9931a684c9b81c648dfbe8d7)
Diffstat (limited to 'dlfcn/dlfcn.h')
0 files changed, 0 insertions, 0 deletions