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MIPS: Fix seccomp syscall argument for MIPS64

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Commit 4c21b8fd8f ("MIPS: seccomp: Handle indirect system calls (o32)")
fixed indirect system calls on O32 but it also introduced a bug for MIPS64
where it erroneously modified the v0 (syscall) register with the assumption
that the sycall offset hasn't been taken into consideration. This breaks
seccomp on MIPS64 n64 and n32 ABIs. We fix this by replacing the addition
with a move instruction.

Fixes: 4c21b8fd8f ("MIPS: seccomp: Handle indirect system calls (o32)")
Cc: <stable@vger.kernel.org> # 3.15+
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/10951/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Markos Chandras 2015-08-13 08:47:59 +01:00 committed by Ralf Baechle
parent f7644cbfcd
commit 9f161439e4
2 changed files with 2 additions and 2 deletions
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2
arch/mips/kernel/scall64-64.S
View file

@ -80,7 +80,7 @@ syscall_trace_entry:
SAVE_STATIC
move s0, t2
move a0, sp
daddiu a1, v0, __NR_64_Linux
move a1, v0
jal syscall_trace_enter
bltz v0, 2f # seccomp failed? Skip syscall

2
arch/mips/kernel/scall64-n32.S
View file

@ -72,7 +72,7 @@ n32_syscall_trace_entry:
SAVE_STATIC
move s0, t2
move a0, sp
daddiu a1, v0, __NR_N32_Linux
move a1, v0
jal syscall_trace_enter
bltz v0, 2f # seccomp failed? Skip syscall