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| author | Florian Weimer <fweimer@redhat.com> | 2024-12-17 18:12:03 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2024-12-17 18:52:10 +0100 |
| commit | 2c8a7f14fac3628b6a06cc76cdfda54a7ac20386 (patch) | |
| tree | 8be50b23afd80e0c0aab03cac0e297dec3cb7ee3 | |
| parent | 2c882bf9c15d206aaf04766d1b8e3ae5b1002cc2 (diff) | |
| download | glibc-2c8a7f14fac3628b6a06cc76cdfda54a7ac20386.zip glibc-2c8a7f14fac3628b6a06cc76cdfda54a7ac20386.tar.gz glibc-2c8a7f14fac3628b6a06cc76cdfda54a7ac20386.tar.bz2 | |
x86: Avoid integer truncation with large cache sizes (bug 32470)release/2.39/master
Some hypervisors report 1 TiB L3 cache size. This results
in some variables incorrectly getting zeroed, causing crashes
in memcpy/memmove because invariants are violated.
(cherry picked from commit 61c3450db96dce96ad2b24b4f0b548e6a46d68e5)
| -rw-r--r-- | NEWS | 1 | ||||
| -rw-r--r-- | sysdeps/x86/dl-cacheinfo.h | 4 |
2 files changed, 3 insertions, 2 deletions
@@ -93,6 +93,7 @@ The following bugs are resolved with this release: [32052] Name space violation in fortify wrappers [32137] libio: Attempt wide backup free only for non-legacy code [32231] elf: Change ldconfig auxcache magic number + [32470] x86: Avoid integer truncation with large cache sizes Version 2.39 diff --git a/sysdeps/x86/dl-cacheinfo.h b/sysdeps/x86/dl-cacheinfo.h index 5a98f70..1f68968 100644 --- a/sysdeps/x86/dl-cacheinfo.h +++ b/sysdeps/x86/dl-cacheinfo.h @@ -959,11 +959,11 @@ dl_init_cacheinfo (struct cpu_features *cpu_features) non_temporal_threshold = maximum_non_temporal_threshold; /* NB: The REP MOVSB threshold must be greater than VEC_SIZE * 8. */ - unsigned int minimum_rep_movsb_threshold; + unsigned long int minimum_rep_movsb_threshold; /* NB: The default REP MOVSB threshold is 4096 * (VEC_SIZE / 16) for VEC_SIZE == 64 or 32. For VEC_SIZE == 16, the default REP MOVSB threshold is 2048 * (VEC_SIZE / 16). */ - unsigned int rep_movsb_threshold; + unsigned long int rep_movsb_threshold; if (CPU_FEATURE_USABLE_P (cpu_features, AVX512F) && !CPU_FEATURE_PREFERRED_P (cpu_features, Prefer_No_AVX512)) { |