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x86: Avoid integer truncation with large cache sizes (RHEL-76387)

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Resolves: RHEL-76387
This commit is contained in:
Patsy Griffin 2025-04-23 08:36:21 -04:00
parent d72b902998
commit 01b9bca186
2 changed files with 37 additions and 1 deletions
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32
glibc-RHEL-76387.patch Normal file
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@ -0,0 +1,32 @@
commit 61c3450db96dce96ad2b24b4f0b548e6a46d68e5
Author: Florian Weimer <fweimer@redhat.com>
Date: Tue Dec 17 18:12:03 2024 +0100
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.
Conflicts:
sysdeps/x86/dl-cacheinfo.h
(missing backport of commit 2d651eb9265d1366d7b9e881bfddd4
("x86: Move x86 processor cache info to cpu_features"))
diff -Nrup a/sysdeps/x86/cacheinfo.h b/sysdeps/x86/cacheinfo.h
--- a/sysdeps/x86/cacheinfo.h 2025-04-09 11:11:06.532319998 -0400
+++ b/sysdeps/x86/cacheinfo.h 2025-04-09 11:17:39.493355111 -0400
@@ -388,11 +388,11 @@ init_cacheinfo (void)
: 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))
{

6
glibc.spec
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@ -115,7 +115,7 @@ end \
Summary: The GNU libc libraries
Name: glibc
Version: %{glibcversion}
Release: %{glibcrelease}.17
Release: %{glibcrelease}.18
# In general, GPLv2+ is used by programs, LGPLv2+ is used for
# libraries.
@ -1263,6 +1263,7 @@ Patch1028: glibc-RHEL-83306-1.patch
Patch1029: glibc-RHEL-83306-2.patch
Patch1030: glibc-RHEL-35280.patch
Patch1031: glibc-RHEL-76211.patch
Patch1032: glibc-RHEL-76387.patch
##############################################################################
# Continued list of core "glibc" package information:
@ -2924,6 +2925,9 @@ fi
%{_libdir}/libpthread_nonshared.a
%changelog
* Fri Apr 18 2025 Patsy Griffin <patsy@redhat.com> - 2.28-251.18
- x86: Avoid integer truncation with large cache sizes (RHEL-76387)
* Wed Apr 16 2025 Patsy Griffin <patsy@redhat.com> - 2.28-251.17
- x86: Check the lower byte of EAX of CPUID leaf 2 (RHEL-76211)