From 910cd32e552ea09caa89cdbe328e468979b030dd Mon Sep 17 00:00:00 2001 From: Helge Deller Date: Wed, 30 Mar 2016 14:14:31 +0200 Subject: parisc: Fix and enable seccomp filter support The seccomp filter support requires careful handling of task registers. This includes reloading of the return value (%r28) and proper syscall exit if secure_computing() returned -1. Additionally we need to sign-extend the syscall number from signed 32bit to signed 64bit in do_syscall_trace_enter() since the ptrace interface only allows storing 32bit values in compat mode. Signed-off-by: Helge Deller Cc: stable@vger.kernel.org # v4.5 --- arch/parisc/kernel/syscall.S | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch/parisc/kernel/syscall.S') diff --git a/arch/parisc/kernel/syscall.S b/arch/parisc/kernel/syscall.S index fbafa0d0e2bf..c976ebfe2269 100644 --- a/arch/parisc/kernel/syscall.S +++ b/arch/parisc/kernel/syscall.S @@ -329,6 +329,7 @@ tracesys_next: ldo -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr */ LDREG TI_TASK(%r1), %r1 + LDREG TASK_PT_GR28(%r1), %r28 /* Restore return value */ LDREG TASK_PT_GR26(%r1), %r26 /* Restore the users args */ LDREG TASK_PT_GR25(%r1), %r25 LDREG TASK_PT_GR24(%r1), %r24 @@ -342,6 +343,7 @@ tracesys_next: stw %r21, -56(%r30) /* 6th argument */ #endif + cmpib,COND(=),n -1,%r20,tracesys_exit /* seccomp may have returned -1 */ comiclr,>>= __NR_Linux_syscalls, %r20, %r0 b,n .Ltracesys_nosys -- cgit v1.2.3