glibc/glibc-upstream-2.34-91.patch
Florian Weimer 234a1c0ad2 Import glibc-2.34-24.fc35 from f35
* Tue Feb  1 2022 Florian Weimer <fweimer@redhat.com> - 2.34-24
- Sync with upstream branch release/2.34/master,
  commit 008003dc6e83439c5e04a744b7fd8197df19096e:
- tst-socket-timestamp-compat.c: Check __TIMESIZE [BZ #28837]
- Linux: Only generate 64 bit timestamps for 64 bit time_t recvmsg/recvmmsg
- linux: Fix ancillary 64-bit time timestamp conversion (BZ #28349, BZ#28350)
- support: Add support_socket_so_timestamp_time64

* Tue Feb  1 2022 Florian Weimer <fweimer@redhat.com> - 2.34-23
- Align with glibc 2.35 version of C.UTF-8

* Tue Feb  1 2022 Florian Weimer <fweimer@redhat.com> - 2.34-22
- Sync with upstream branch release/2.34/master,
  commit aa601d024424c40ae9a69b0c4e394a70ea0570c8:
- x86: Use CHECK_FEATURE_PRESENT to check HLE [BZ #27398]
- x86: Filter out more Intel CPUs for TSX [BZ #27398]
- Fix glibc 2.34 ABI omission (missing GLIBC_2.34 in dynamic loader)
- x86: Fix __wcsncmp_evex in strcmp-evex.S [BZ# 28755]
- x86: Fix __wcsncmp_avx2 in strcmp-avx2.S [BZ# 28755]

Resolves: #2037056
2022-02-01 21:15:30 +01:00

37 lines
1.3 KiB
Diff

commit b50d5b746cc0af5ad52164dcb0d3628f08b05a0d
Author: Noah Goldstein <goldstein.w.n@gmail.com>
Date: Sun Jan 9 16:02:21 2022 -0600
x86: Fix __wcsncmp_avx2 in strcmp-avx2.S [BZ# 28755]
Fixes [BZ# 28755] for wcsncmp by redirecting length >= 2^56 to
__wcscmp_avx2. For x86_64 this covers the entire address range so any
length larger could not possibly be used to bound `s1` or `s2`.
test-strcmp, test-strncmp, test-wcscmp, and test-wcsncmp all pass.
Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
(cherry picked from commit ddf0992cf57a93200e0c782e2a94d0733a5a0b87)
diff --git a/sysdeps/x86_64/multiarch/strcmp-avx2.S b/sysdeps/x86_64/multiarch/strcmp-avx2.S
index 40333010a65650f9..3dfcb1bf803cf9ec 100644
--- a/sysdeps/x86_64/multiarch/strcmp-avx2.S
+++ b/sysdeps/x86_64/multiarch/strcmp-avx2.S
@@ -87,6 +87,16 @@ ENTRY (STRCMP)
je L(char0)
jb L(zero)
# ifdef USE_AS_WCSCMP
+# ifndef __ILP32__
+ movq %rdx, %rcx
+ /* Check if length could overflow when multiplied by
+ sizeof(wchar_t). Checking top 8 bits will cover all potential
+ overflow cases as well as redirect cases where its impossible to
+ length to bound a valid memory region. In these cases just use
+ 'wcscmp'. */
+ shrq $56, %rcx
+ jnz __wcscmp_avx2
+# endif
/* Convert units: from wide to byte char. */
shl $2, %RDX_LP
# endif