Commit-ID: 246f2d2ee1d715e1077fc47d61c394569c8ee692 Gitweb: http://git.kernel.org/tip/246f2d2ee1d715e1077fc47d61c394569c8ee692 Author: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx> AuthorDate: Wed, 30 Apr 2014 14:03:25 -0700 Committer: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx> CommitDate: Wed, 30 Apr 2014 14:14:49 -0700 x86-32, espfix: Remove filter for espfix32 due to race It is not safe to use LAR to filter when to go down the espfix path, because the LDT is per-process (rather than per-thread) and another thread might change the descriptors behind our back. Fortunately it is always *safe* (if a bit slow) to go down the espfix path, and a 32-bit LDT stack segment is extremely rare. Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx> Link: http://lkml.kernel.org/r/1398816946-3351-1-git-send-email-hpa@xxxxxxxxxxxxxxx Cc: <stable@xxxxxxxxxxxxxxx> # consider after upstream merge --- arch/x86/kernel/entry_32.S | 5 ----- 1 file changed, 5 deletions(-) diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S index a2a4f46..2780b8f 100644 --- a/arch/x86/kernel/entry_32.S +++ b/arch/x86/kernel/entry_32.S @@ -551,11 +551,6 @@ ENTRY(iret_exc) CFI_RESTORE_STATE ldt_ss: - larl PT_OLDSS(%esp), %eax - jnz restore_nocheck - testl $0x00400000, %eax # returning to 32bit stack? - jnz restore_nocheck # allright, normal return - #ifdef CONFIG_PARAVIRT /* * The kernel can't run on a non-flat stack if paravirt mode -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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