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| author | H.J. Lu <hjl.tools@gmail.com> | 2019-02-01 12:17:09 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2019-02-01 15:32:53 -0800 |
| commit | bff8346b0184b15fbb80863112133f48a7bd62a9 (patch) | |
| tree | b0dcd6025eba0540bfb2019ab2a6b116a1bc8cc3 /nptl/tst-robustpi6.c | |
| parent | 7ab39c6a3cd4a61a2be3d2e6a2a56f4dccca9750 (diff) | |
| download | glibc-bff8346b0184b15fbb80863112133f48a7bd62a9.tar.gz | |
x86-64 memchr/wmemchr: 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 memchr/wmemchr 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/memchr.S: Use RDX_LP for length. Clear the
upper 32 bits of RDX register.
* sysdeps/x86_64/multiarch/memchr-avx2.S: Likewise.
* sysdeps/x86_64/x32/Makefile (tests): Add tst-size_t-memchr and
tst-size_t-wmemchr.
* sysdeps/x86_64/x32/test-size_t.h: New file.
* sysdeps/x86_64/x32/tst-size_t-memchr.c: Likewise.
* sysdeps/x86_64/x32/tst-size_t-wmemchr.c: Likewise.
(cherry picked from commit 97700a34f36721b11a754cf37a1cc40695ece1fd)
Diffstat (limited to 'nptl/tst-robustpi6.c')
0 files changed, 0 insertions, 0 deletions