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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 18:49:50 +0100 |
| commit | 61c3450db96dce96ad2b24b4f0b548e6a46d68e5 (patch) | |
| tree | e0d2086ee13ce974bf0e7b0a11266c5ec1d5f9bf | |
| parent | 77e921bc611ea56eba206354c5134af0610cf6fe (diff) | |
| download | glibc-61c3450db96dce96ad2b24b4f0b548e6a46d68e5.zip glibc-61c3450db96dce96ad2b24b4f0b548e6a46d68e5.tar.gz glibc-61c3450db96dce96ad2b24b4f0b548e6a46d68e5.tar.bz2 | |
x86: Avoid integer truncation with large cache sizes (bug 32470)
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.
| -rw-r--r-- | sysdeps/x86/dl-cacheinfo.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sysdeps/x86/dl-cacheinfo.h b/sysdeps/x86/dl-cacheinfo.h index e957950..6a0a30b 100644 --- a/sysdeps/x86/dl-cacheinfo.h +++ b/sysdeps/x86/dl-cacheinfo.h @@ -1021,11 +1021,11 @@ 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)) { |