[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen stable-4.14] x86/pv: Don't deliver #GP for a SYSENTER with NT set
commit 64c39517b5d2c2f324b87e7d663b184fca528d39 Author: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> AuthorDate: Tue Oct 20 14:41:48 2020 +0200 Commit: Jan Beulich <jbeulich@xxxxxxxx> CommitDate: Tue Oct 20 14:41:48 2020 +0200 x86/pv: Don't deliver #GP for a SYSENTER with NT set It is a matter of guest kernel policy what to do with offending userspace, and terminating said userspace may not be the action chosen. Linux explicitly tolerates this case. Reported-by: Andy Lutomirski <luto@xxxxxxxxxx> Fixes: fdac951560 ("x86: clear EFLAGS.NT in SYSENTER entry path") Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx> master commit: 61d4a04349895edc5a5868274b906ba61ef24f47 master date: 2020-09-24 21:02:35 +0100 --- xen/arch/x86/x86_64/entry.S | 1 - 1 file changed, 1 deletion(-) diff --git a/xen/arch/x86/x86_64/entry.S b/xen/arch/x86/x86_64/entry.S index 7510212956..000eb9722b 100644 --- a/xen/arch/x86/x86_64/entry.S +++ b/xen/arch/x86/x86_64/entry.S @@ -313,7 +313,6 @@ UNLIKELY_START(nz, sysenter_nt_set) pushfq andl $~X86_EFLAGS_NT,(%rsp) popfq - xorl %eax,%eax UNLIKELY_END(sysenter_nt_set) testq %rax,%rax leal (,%rcx,TBF_INTERRUPT),%ecx -- generated by git-patchbot for /home/xen/git/xen.git#stable-4.14
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