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SubjectRe: [PATCH] x86: always use SYSCALL_DEFINE*
Michael,

On Tue, Mar 13, 2018 at 11:18:08PM +0000, Andy Lutomirski wrote:
> On Tue, Mar 13, 2018 at 9:16 PM, Jann Horn <jannh@google.com> wrote:
> > On Sat, Mar 10, 2018 at 12:55 PM, Tautschnig, Michael
> > <tautschn@amazon.co.uk> wrote:
> >> All syscall arguments are passed in as types of the same byte size as
> >> unsigned long (width of full registers). Using a smaller type without a
> >> cast may result in losing bits of information. SYSCALL_DEFINE* introduce
> >> adequate type casts. All definitions of syscalls in x86 except for those
> >> patched here have already been using the appropriate SYSCALL_DEFINE*.
> > [...]
> >> diff --git a/arch/x86/kernel/ioport.c b/arch/x86/kernel/ioport.c
> >> index 2f72330..d98b2a3 100644
> >> --- a/arch/x86/kernel/ioport.c
> >> +++ b/arch/x86/kernel/ioport.c
> >> @@ -23,7 +23,8 @@
> >> /*
> >> * this changes the io permissions bitmap in the current task.
> >> */
> >> -asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on)
> >> +SYSCALL_DEFINE3(sys_ioperm, unsigned long, from, unsigned long, num, int,
> >> + turn_on)
> >
> > Shouldn't this be "SYSCALL_DEFINE3(ioperm, [...]", without the "sys_"?
> > --
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>
> I think this patch will be obsoleted by a series of patches from Dominik.

... the ioperm change is already in mainline (did an equivalent change a
couple of days ago), but the sigreturn/rt_sigreturn changes still seem
useful. Could you send a fresh patch with just these two changes; and -- if
the x86 maintainers agree -- I will push it with my syscall-related changes?

Thanks,
Dominik

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