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Commit 9d37c405 authored by Markos Chandras's avatar Markos Chandras Committed by Ralf Baechle
Browse files

MIPS: kernel: scalls: Skip the syscall if denied by the seccomp filter 



Signed-off-by: default avatarMarkos Chandras <markos.chandras@imgtec.com>
Reviewed-by: default avatarPaul Burton <paul.burton@imgtec.com>
Reviewed-by: default avatarJames Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6399/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 1225eb82

arch/mips/kernel/scall32-o32.S

+3 −1
Original line number Diff line number Diff line
@@ -120,6 +120,8 @@ syscall_trace_entry: 
	move	a0, sp

	jal	syscall_trace_enter



	bltz	v0, 2f			# seccomp failed? Skip syscall



	move	t0, s0

	RESTORE_STATIC

	lw	a0, PT_R4(sp)		# Restore argument registers
@@ -138,7 +140,7 @@ syscall_trace_entry: 
	sw	t1, PT_R0(sp)		# save it for syscall restarting

1:	sw	v0, PT_R2(sp)		# result



	j	syscall_exit

2:	j	syscall_exit



/* ------------------------------------------------------------------------ */

arch/mips/kernel/scall64-64.S

+3 −1
Original line number Diff line number Diff line
@@ -82,6 +82,8 @@ syscall_trace_entry: 
	move	a0, sp

	jal	syscall_trace_enter



	bltz	v0, 2f			# seccomp failed? Skip syscall



	move	t0, s0

	RESTORE_STATIC

	ld	a0, PT_R4(sp)		# Restore argument registers
@@ -102,7 +104,7 @@ syscall_trace_entry: 
	sd	t1, PT_R0(sp)		# save it for syscall restarting

1:	sd	v0, PT_R2(sp)		# result



	j	syscall_exit

2:	j	syscall_exit



illegal_syscall:

	/* This also isn't a 64-bit syscall, throw an error.  */

arch/mips/kernel/scall64-n32.S

+3 −1
Original line number Diff line number Diff line
@@ -74,6 +74,8 @@ n32_syscall_trace_entry: 
	move	a0, sp

	jal	syscall_trace_enter



	bltz	v0, 2f			# seccomp failed? Skip syscall



	move	t0, s0

	RESTORE_STATIC

	ld	a0, PT_R4(sp)		# Restore argument registers
@@ -94,7 +96,7 @@ n32_syscall_trace_entry: 
	sd	t1, PT_R0(sp)		# save it for syscall restarting

1:	sd	v0, PT_R2(sp)		# result



	j	syscall_exit

2:	j	syscall_exit



not_n32_scall:

	/* This is not an n32 compatibility syscall, pass it on to

arch/mips/kernel/scall64-o32.S

+3 −1
Original line number Diff line number Diff line
@@ -114,6 +114,8 @@ trace_a_syscall: 
	move	a0, sp

	jal	syscall_trace_enter



	bltz	v0, 2f			# seccomp failed? Skip syscall



	move	t0, s0

	RESTORE_STATIC

	ld	a0, PT_R4(sp)		# Restore argument registers
@@ -136,7 +138,7 @@ trace_a_syscall: 
	sd	t1, PT_R0(sp)		# save it for syscall restarting

1:	sd	v0, PT_R2(sp)		# result



	j	syscall_exit

2:	j	syscall_exit



/* ------------------------------------------------------------------------ */