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linux: Fix a mistake in commit fb58045145

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The change to futex_andl_smap() should have ordered stac before the
load from a user address, otherwise it does not fix anything.

Fixes:	fb58045145 ("linux: Fix SMAP-enabled futex routines")
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Mark Johnston 2021-05-16 22:17:53 -04:00
parent 5b81e2e1bc
commit 60cb98a1bd
1 changed files with 1 additions and 1 deletions
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2
sys/amd64/linux32/linux32_support.s
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@ -168,8 +168,8 @@ ENTRY(futex_andl_smap)
movq $VM_MAXUSER_ADDRESS-4,%rax
cmpq %rax,%rsi
ja futex_fault
movl (%rsi),%eax
stac
movl (%rsi),%eax
1: movl %eax,%ecx
andl %edi,%ecx
#ifdef SMP