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

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Reviewed-by: Paul Burton <paul.burton@imgtec.com>
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6399/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Markos Chandras 2014-01-22 14:40:02 +00:00 committed by Ralf Baechle
parent 1225eb8252
commit 9d37c405ed
4 changed files with 12 additions and 4 deletions
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4
arch/mips/kernel/scall32-o32.S
View File

@ -120,6 +120,8 @@ syscall_trace_entry:
move a0, sp move a0, sp
jal syscall_trace_enter jal syscall_trace_enter
bltz v0, 2f # seccomp failed? Skip syscall
move t0, s0 move t0, s0
RESTORE_STATIC RESTORE_STATIC
lw a0, PT_R4(sp) # Restore argument registers 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 sw t1, PT_R0(sp) # save it for syscall restarting
1: sw v0, PT_R2(sp) # result 1: sw v0, PT_R2(sp) # result
j syscall_exit 2: j syscall_exit
/* ------------------------------------------------------------------------ */ /* ------------------------------------------------------------------------ */

4
arch/mips/kernel/scall64-64.S
View File

@ -82,6 +82,8 @@ syscall_trace_entry:
move a0, sp move a0, sp
jal syscall_trace_enter jal syscall_trace_enter
bltz v0, 2f # seccomp failed? Skip syscall
move t0, s0 move t0, s0
RESTORE_STATIC RESTORE_STATIC
ld a0, PT_R4(sp) # Restore argument registers 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 sd t1, PT_R0(sp) # save it for syscall restarting
1: sd v0, PT_R2(sp) # result 1: sd v0, PT_R2(sp) # result
j syscall_exit 2: j syscall_exit
illegal_syscall: illegal_syscall:
/* This also isn't a 64-bit syscall, throw an error. */ /* This also isn't a 64-bit syscall, throw an error. */

4
arch/mips/kernel/scall64-n32.S
View File

@ -74,6 +74,8 @@ n32_syscall_trace_entry:
move a0, sp move a0, sp
jal syscall_trace_enter jal syscall_trace_enter
bltz v0, 2f # seccomp failed? Skip syscall
move t0, s0 move t0, s0
RESTORE_STATIC RESTORE_STATIC
ld a0, PT_R4(sp) # Restore argument registers 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 sd t1, PT_R0(sp) # save it for syscall restarting
1: sd v0, PT_R2(sp) # result 1: sd v0, PT_R2(sp) # result
j syscall_exit 2: j syscall_exit
not_n32_scall: not_n32_scall:
/* This is not an n32 compatibility syscall, pass it on to /* This is not an n32 compatibility syscall, pass it on to

4
arch/mips/kernel/scall64-o32.S
View File

@ -114,6 +114,8 @@ trace_a_syscall:
move a0, sp move a0, sp
jal syscall_trace_enter jal syscall_trace_enter
bltz v0, 2f # seccomp failed? Skip syscall
move t0, s0 move t0, s0
RESTORE_STATIC RESTORE_STATIC
ld a0, PT_R4(sp) # Restore argument registers 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 sd t1, PT_R0(sp) # save it for syscall restarting
1: sd v0, PT_R2(sp) # result 1: sd v0, PT_R2(sp) # result
j syscall_exit 2: j syscall_exit
/* ------------------------------------------------------------------------ */ /* ------------------------------------------------------------------------ */