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| author | H.J. Lu <hjl.tools@gmail.com> | 2019-01-21 11:27:25 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2019-01-21 11:27:36 -0800 |
| commit | 231c56760c1e2ded21ad96bbb860b1f08c556c7a (patch) | |
| tree | 4aca6b1947a0188731cbf37e27b307cc8603b1ef /ChangeLog | |
| parent | b304fc201d2f6baf52ea790df8643e99772243cd (diff) | |
| download | glibc-231c56760c1e2ded21ad96bbb860b1f08c556c7a.tar.gz glibc-231c56760c1e2ded21ad96bbb860b1f08c556c7a.tar.xz glibc-231c56760c1e2ded21ad96bbb860b1f08c556c7a.zip | |
x86-64 memcpy: 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 memcpy 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/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. * sysdeps/x86_64/multiarch/memmove-avx512-no-vzeroupper.S: Likewise. * sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S: Likewise. * sysdeps/x86_64/x32/Makefile (tests): Add tst-size_t-memcpy. tst-size_t-wmemchr. * sysdeps/x86_64/x32/tst-size_t-memcpy.c: New file.
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index 7865b76882..57fe1b668e 100644 --- a/ChangeLog +++ b/ChangeLog @@ -2,6 +2,21 @@ [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. + * sysdeps/x86_64/multiarch/memmove-avx512-no-vzeroupper.S: + Likewise. + * sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S: + Likewise. + * sysdeps/x86_64/x32/Makefile (tests): Add tst-size_t-memcpy. + tst-size_t-wmemchr. + * sysdeps/x86_64/x32/tst-size_t-memcpy.c: New file. + +2019-01-21 H.J. Lu <hongjiu.lu@intel.com> + + [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. |