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Peter Anvin" , Jaswinder Singh , Andi Kleen Subject: [PATCH] x86: always use SYSCALL_DEFINE* Thread-Topic: [PATCH] x86: always use SYSCALL_DEFINE* Thread-Index: AQHTuLIp4kJZlR4voUmoYns5SdXQ2A== Date: Sat, 10 Mar 2018 20:55:46 +0000 Message-ID: <14A5C8D0-3F9D-486F-A20C-55849D70FC80@amazon.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.43.165.246] Content-Type: text/plain; charset="us-ascii" Content-ID: <91976A686E6EEE4DB3F549E4F8BBBB3C@amazon.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Sender: linux-api-owner@vger.kernel.org X-Mailing-List: linux-api@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 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*. Signed-off-by: Michael Tautschnig Cc: Thomas Gleixner Cc: Ingo Molnar Cc: H. Peter Anvin Cc: Jaswinder Singh Cc: Andi Kleen --- arch/x86/kernel/ioport.c | 3 ++- arch/x86/kernel/signal.c | 5 +++-- 2 files changed, 5 insertions(+), 3 deletions(-) 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) { struct thread_struct *t =3D ¤t->thread; struct tss_struct *tss; diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c index b9e00e8..40ba242 100644 --- a/arch/x86/kernel/signal.c +++ b/arch/x86/kernel/signal.c @@ -25,6 +25,7 @@ #include #include #include +#include #include #include @@ -601,7 +602,7 @@ static int x32_setup_rt_frame(struct ksignal *ksig, * Do a signal return; undo the signal stack. */ #ifdef CONFIG_X86_32 -asmlinkage unsigned long sys_sigreturn(void) +SYSCALL_DEFINE0(sigreturn) { struct pt_regs *regs =3D current_pt_regs(); struct sigframe __user *frame; @@ -633,7 +634,7 @@ asmlinkage unsigned long sys_sigreturn(void) } #endif /* CONFIG_X86_32 */ -asmlinkage long sys_rt_sigreturn(void) +SYSCALL_DEFINE0(rt_sigreturn) { struct pt_regs *regs =3D current_pt_regs(); struct rt_sigframe __user *frame; -- 2.7.3.AMZN Amazon Web Services UK Limited. 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