17be09a1f0
Patches have been imported into nixpkgs and manually edited to avoid merge conflicts on ChangeLog / NEWS files.
55 lines
1.8 KiB
Diff
55 lines
1.8 KiB
Diff
From f51c8367685dc888a02f7304c729ed5277904aff Mon Sep 17 00:00:00 2001
|
|
From: Andreas Schwab <schwab@suse.de>
|
|
Date: Thu, 24 May 2018 14:39:18 +0200
|
|
Subject: [PATCH] Don't write beyond destination in
|
|
__mempcpy_avx512_no_vzeroupper (bug 23196)
|
|
|
|
When compiled as mempcpy, the return value is the end of the destination
|
|
buffer, thus it cannot be used to refer to the start of it.
|
|
|
|
(cherry picked from commit 9aaaab7c6e4176e61c59b0a63c6ba906d875dc0e)
|
|
---
|
|
ChangeLog | 9 +++++++++
|
|
NEWS | 7 +++++++
|
|
string/test-mempcpy.c | 1 +
|
|
sysdeps/x86_64/multiarch/memmove-avx512-no-vzeroupper.S | 5 +++--
|
|
4 files changed, 20 insertions(+), 2 deletions(-)
|
|
|
|
diff --git a/string/test-mempcpy.c b/string/test-mempcpy.c
|
|
index c08fba8..d98ecdd 100644
|
|
--- a/string/test-mempcpy.c
|
|
+++ b/string/test-mempcpy.c
|
|
@@ -18,6 +18,7 @@
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#define MEMCPY_RESULT(dst, len) (dst) + (len)
|
|
+#define MIN_PAGE_SIZE 131072
|
|
#define TEST_MAIN
|
|
#define TEST_NAME "mempcpy"
|
|
#include "test-string.h"
|
|
diff --git a/sysdeps/x86_64/multiarch/memmove-avx512-no-vzeroupper.S b/sysdeps/x86_64/multiarch/memmove-avx512-no-vzeroupper.S
|
|
index 23c0f7a..effc3ac 100644
|
|
--- a/sysdeps/x86_64/multiarch/memmove-avx512-no-vzeroupper.S
|
|
+++ b/sysdeps/x86_64/multiarch/memmove-avx512-no-vzeroupper.S
|
|
@@ -336,6 +336,7 @@ L(preloop_large):
|
|
vmovups (%rsi), %zmm4
|
|
vmovups 0x40(%rsi), %zmm5
|
|
|
|
+ mov %rdi, %r11
|
|
/* Align destination for access with non-temporal stores in the loop. */
|
|
mov %rdi, %r8
|
|
and $-0x80, %rdi
|
|
@@ -366,8 +367,8 @@ L(gobble_256bytes_nt_loop):
|
|
cmp $256, %rdx
|
|
ja L(gobble_256bytes_nt_loop)
|
|
sfence
|
|
- vmovups %zmm4, (%rax)
|
|
- vmovups %zmm5, 0x40(%rax)
|
|
+ vmovups %zmm4, (%r11)
|
|
+ vmovups %zmm5, 0x40(%r11)
|
|
jmp L(check)
|
|
|
|
L(preloop_large_bkw):
|
|
--
|
|
2.9.3
|
|
|