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| author | H.J. Lu <hjl.tools@gmail.com> | 2019-02-01 12:20:54 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2019-02-01 12:21:03 -0800 |
| commit | eee0a3d04b8226abd8a6ca077094afbb3559dddb (patch) | |
| tree | 08b55577b20863458d4701007063173f0f927f58 /ChangeLog | |
| parent | 781403407b3a432c8fd28cb1f630a63244eb4394 (diff) | |
| download | glibc-eee0a3d04b8226abd8a6ca077094afbb3559dddb.tar.gz | |
x86-64 memrchr: 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 memrchr 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/memrchr.S: Use RDX_LP for length.
* sysdeps/x86_64/multiarch/memrchr-avx2.S: Likewise.
* sysdeps/x86_64/x32/Makefile (tests): Add tst-size_t-memrchr.
* sysdeps/x86_64/x32/tst-size_t-memrchr.c: New file.
(cherry picked from commit ecd8b842cf37ea112e59cd9085ff1f1b6e208ae0)
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 9 |
1 files changed, 9 insertions, 0 deletions
@@ -2,6 +2,15 @@ [BZ #24097] CVE-2019-6488 + * sysdeps/x86_64/memrchr.S: Use RDX_LP for length. + * sysdeps/x86_64/multiarch/memrchr-avx2.S: Likewise. + * sysdeps/x86_64/x32/Makefile (tests): Add tst-size_t-memrchr. + * sysdeps/x86_64/x32/tst-size_t-memrchr.c: New file. + +2019-02-01 H.J. Lu <hongjiu.lu@intel.com> + + [BZ #24097] + CVE-2019-6488 * sysdeps/x86_64/multiarch/memcpy-ssse3-back.S: Use RDX_LP for length. Clear the upper 32 bits of RDX register. * sysdeps/x86_64/multiarch/memcpy-ssse3.S: Likewise. |