33 lines
1.4 KiB
Diff
33 lines
1.4 KiB
Diff
commit 61c3450db96dce96ad2b24b4f0b548e6a46d68e5
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Tue Dec 17 18:12:03 2024 +0100
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x86: Avoid integer truncation with large cache sizes (bug 32470)
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Some hypervisors report 1 TiB L3 cache size. This results
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in some variables incorrectly getting zeroed, causing crashes
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in memcpy/memmove because invariants are violated.
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Conflicts:
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sysdeps/x86/dl-cacheinfo.h
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(missing backport of commit 2d651eb9265d1366d7b9e881bfddd4
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("x86: Move x86 processor cache info to cpu_features"))
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diff -Nrup a/sysdeps/x86/cacheinfo.h b/sysdeps/x86/cacheinfo.h
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--- a/sysdeps/x86/cacheinfo.h 2025-04-09 11:11:06.532319998 -0400
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+++ b/sysdeps/x86/cacheinfo.h 2025-04-09 11:17:39.493355111 -0400
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@@ -388,11 +388,11 @@ init_cacheinfo (void)
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: non_temporal_threshold);
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/* NB: The REP MOVSB threshold must be greater than VEC_SIZE * 8. */
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- unsigned int minimum_rep_movsb_threshold;
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+ unsigned long int minimum_rep_movsb_threshold;
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/* NB: The default REP MOVSB threshold is 4096 * (VEC_SIZE / 16) for
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VEC_SIZE == 64 or 32. For VEC_SIZE == 16, the default REP MOVSB
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threshold is 2048 * (VEC_SIZE / 16). */
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- unsigned int rep_movsb_threshold;
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+ unsigned long int rep_movsb_threshold;
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if (CPU_FEATURE_USABLE_P (cpu_features, AVX512F)
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&& !CPU_FEATURE_PREFERRED_P (cpu_features, Prefer_No_AVX512))
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{
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