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| author | H.J. Lu <hjl.tools@gmail.com> | 2019-01-21 11:23:59 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2019-01-21 11:24:13 -0800 |
| commit | 97700a34f36721b11a754cf37a1cc40695ece1fd (patch) | |
| tree | 026802789792449adc9de3532ee8b10685086401 /NEWS | |
| parent | 6ca53a2453598804a2559a548a08424fca96434a (diff) | |
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.
Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 6 |
1 files changed, 6 insertions, 0 deletions
@@ -101,6 +101,12 @@ Security related changes: denial of service due to resource exhaustion when processing getaddrinfo calls with crafted host names. Reported by Guido Vranken. + CVE-2019-6488: On x32, the size_t parameter may be passed in the lower + 32 bits of a 64-bit register with with non-zero upper 32 bit. When it + happened, accessing the 32-bit size_t value as the full 64-bit register + in the assembly string/memory functions would cause a buffer overflow. + Reported by H.J. Lu. + The following bugs are resolved with this release: [The release manager will add the list generated by |