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| author | Aurelien Jarno <aurelien@aurel32.net> | 2022-01-17 19:41:40 +0100 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2022-01-17 19:49:44 +0100 |
| commit | a51b76b71e8190a50b0e0c0b32f313888b930108 (patch) | |
| tree | 11f3cb6646f262308a731d7715b08d023262e1be /NEWS | |
| parent | 55b99e9ed07688019609bd4dcd17d3ebf4572948 (diff) | |
| download | glibc-a51b76b71e8190a50b0e0c0b32f313888b930108.tar.gz glibc-a51b76b71e8190a50b0e0c0b32f313888b930108.tar.xz glibc-a51b76b71e8190a50b0e0c0b32f313888b930108.zip | |
x86: use default cache size if it cannot be determined [BZ #28784]
In some cases (e.g QEMU, non-Intel/AMD CPU) the cache information can
not be retrieved and the corresponding values are set to 0.
Commit 2d651eb9265d ("x86: Move x86 processor cache info to
cpu_features") changed the behaviour in such case by defining the
__x86_shared_cache_size and __x86_data_cache_size variables to 0 instead
of using the default values. This cause an issue with the i686 SSE2
optimized bzero/routine which assumes that the cache size is at least
128 bytes, and otherwise tries to zero/set the whole address space minus
128 bytes.
Fix that by restoring the original code to only update
__x86_shared_cache_size and __x86_data_cache_size variables if the
corresponding cache sizes are not zero.
Fixes bug 28784
Fixes commit 2d651eb9265d
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
(cherry picked from commit c242fcce06e3102ca663b2f992611d0bda4f2668)
Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/NEWS b/NEWS index 6091d5bd82..6e4221ca86 100644 --- a/NEWS +++ b/NEWS @@ -271,6 +271,7 @@ The following bugs are resolved with this release: [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module related to combining characters (CVE-2021-3326) + [28784] x86: crash in 32bit memset-sse2.s when the cache size can not be determined Version 2.32 |