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| author | Andreas Schwab <schwab@suse.de> | 2018-05-22 10:37:59 +0200 |
|---|---|---|
| committer | Andreas Schwab <schwab@suse.de> | 2018-05-23 09:50:57 +0200 |
| commit | 9aaaab7c6e4176e61c59b0a63c6ba906d875dc0e (patch) | |
| tree | 8ce316f806948a2b6f3c29335d39e861dc91df84 /sysdeps/x86_64 | |
| parent | 8f145c77123a565b816f918969e0e35ee5b89153 (diff) | |
| download | glibc-9aaaab7c6e4176e61c59b0a63c6ba906d875dc0e.tar.gz glibc-9aaaab7c6e4176e61c59b0a63c6ba906d875dc0e.tar.xz glibc-9aaaab7c6e4176e61c59b0a63c6ba906d875dc0e.zip | |
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.
Diffstat (limited to 'sysdeps/x86_64')
| -rw-r--r-- | sysdeps/x86_64/multiarch/memmove-avx512-no-vzeroupper.S | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/sysdeps/x86_64/multiarch/memmove-avx512-no-vzeroupper.S b/sysdeps/x86_64/multiarch/memmove-avx512-no-vzeroupper.S index 23c0f7a9ed..effc3ac2de 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): |