Re: [Xen-devel] [PATCH]: Fix syscall return code when ptrace or audit is active

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 30/6/08 15:08, "Chris Lalancette" <clalance@xxxxxxxxxx> wrote:

> Attached is a simple patch to 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, and the pv-ops implementation in the upstream Linux kernel also does
> not have this bug.  The attached patch makes the tracesys path look the same
> as
> it does in upstream Linux, and ensures that we return -ENOSYS on this path.

Thanks. The removal of 'jmp int_ret_from_sys_call' is not part of the
bugfix, and also I think the code is clearer if we keep it. So I've applied
all of this patch except the removal of that jmp.

 -- Keir



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