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| author | H.J. Lu <hjl.tools@gmail.com> | 2019-02-01 12:19:07 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2019-02-01 12:19:20 -0800 |
| commit | f57666aa307a49950bc208269062d638b84f65b0 (patch) | |
| tree | 6a1ae6508c794324da967576c10cec8075139adc /ChangeLog | |
| parent | 492524a691f6df1f6e896d2f616ff24f15f18d86 (diff) | |
| download | glibc-f57666aa307a49950bc208269062d638b84f65b0.tar.gz glibc-f57666aa307a49950bc208269062d638b84f65b0.tar.xz glibc-f57666aa307a49950bc208269062d638b84f65b0.zip | |
x86-64 memcmp/wmemcmp: 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 memcmp/wmemcmp 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/memcmp-avx2-movbe.S: Use RDX_LP for length. Clear the upper 32 bits of RDX register. * sysdeps/x86_64/multiarch/memcmp-sse4.S: Likewise. * sysdeps/x86_64/multiarch/memcmp-ssse3.S: Likewise. * sysdeps/x86_64/x32/Makefile (tests): Add tst-size_t-memcmp and tst-size_t-wmemcmp. * sysdeps/x86_64/x32/tst-size_t-memcmp.c: New file. * sysdeps/x86_64/x32/tst-size_t-wmemcmp.c: Likewise. (cherry picked from commit b304fc201d2f6baf52ea790df8643e99772243cd)
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index 9728d6ba6c..078652c890 100644 --- a/ChangeLog +++ b/ChangeLog @@ -2,6 +2,19 @@ [BZ #24097] CVE-2019-6488 + * sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S: Use RDX_LP for + length. Clear the upper 32 bits of RDX register. + * sysdeps/x86_64/multiarch/memcmp-sse4.S: Likewise. + * sysdeps/x86_64/multiarch/memcmp-ssse3.S: Likewise. + * sysdeps/x86_64/x32/Makefile (tests): Add tst-size_t-memcmp and + tst-size_t-wmemcmp. + * sysdeps/x86_64/x32/tst-size_t-memcmp.c: New file. + * sysdeps/x86_64/x32/tst-size_t-wmemcmp.c: Likewise. + +2019-02-01 H.J. Lu <hongjiu.lu@intel.com> + + [BZ #24097] + CVE-2019-6488 * sysdeps/x86_64/memchr.S: Use RDX_LP for length. Clear the upper 32 bits of RDX register. * sysdeps/x86_64/multiarch/memchr-avx2.S: Likewise. |