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x86_64/vsyscall: Restore orig_ax after vsyscall seccomp 

The vsyscall emulation code sets orig_ax for seccomp's benefit,
but it forgot to set it back.

I'm not sure that this is observable at all, but it could cause
confusion to various /proc or ptrace users, and it's possible
that it could cause minor artifacts if a signal were to be
delivered on return from vsyscall emulation.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/cdc6a564517a4df09235572ee5f530ccdcf933f7.1415144089.git.luto@amacapital.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Andy Lutomirski 2014-11-04 15:36:50 -08:00 committed by Ingo Molnar
parent 07114f0f1c
commit 26893107aa
1 changed files with 1 additions and 0 deletions
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arch/x86/kernel/vsyscall_64.c
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@ -206,6 +206,7 @@ bool emulate_vsyscall(struct pt_regs *regs, unsigned long address)
"seccomp tried to change syscall nr or ip"); "seccomp tried to change syscall nr or ip");
do_exit(SIGSYS); do_exit(SIGSYS);
} }
regs->orig_ax = -1;
if (tmp) if (tmp)
goto do_ret; /* skip requested */ goto do_ret; /* skip requested */