[Xen-changelog] [linux-2.6.18-xen] x86/64: Fix syscall return code when ptrace or audit is active

["Xen patchbot-linux-2.6.18-xen" <patchbot-linux-2.6.18-xen@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1214838844 -3600
# Node ID 3643a33de27793969bd701669ca35ea534712072
# Parent  b29a06ba7a5ff8c85054d56a4135ac38925422c0
x86/64: Fix syscall return code when ptrace or audit is active

Fix the return value from the 64-bit kernel when you call with a bad
system call number with tracing enabled (for either ptrace or audit).
What should happen is that the user process gets a -ENOSYS return
call from the syscall; what actually happens (only in the 64-bit
kernel) is that you get back the system call number. The 32-bit
kernel does not suffer from this bug.

Signed-off-by: Chris Lalancette <clalance@xxxxxxxxxx>
---
 arch/x86_64/kernel/entry-xen.S |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff -r b29a06ba7a5f -r 3643a33de277 arch/x86_64/kernel/entry-xen.S
--- a/arch/x86_64/kernel/entry-xen.S    Fri Jun 27 16:07:56 2008 +0100
+++ b/arch/x86_64/kernel/entry-xen.S    Mon Jun 30 16:14:04 2008 +0100
@@ -334,10 +334,10 @@ tracesys:
        LOAD_ARGS ARGOFFSET  /* reload args from stack in case ptrace changed 
it */
        RESTORE_REST
        cmpq $__NR_syscall_max,%rax
-       ja  1f
+       ja  int_ret_from_sys_call
        movq %r10,%rcx  /* fixup for C */
        call *sys_call_table(,%rax,8)
-1:     movq %rax,RAX-ARGOFFSET(%rsp)
+       movq %rax,RAX-ARGOFFSET(%rsp)
        /* Use IRET because user could have changed frame */
        jmp int_ret_from_sys_call
        CFI_ENDPROC

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