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SubjectRe: [PATCH] x86: always use SYSCALL_DEFINE*
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.

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