xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

MIPS: Sanitize restart logics

Browse Source 
Put the original syscall number into ->regs[0] when we leave syscall
with error.  Use it in restart logics.  Everything else will have
it 0 since we pass through SAVE_SOME on all the ways in.  Note that
in places like bad_stack and inllegal_syscall we leave it 0 - it's not
restartable.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: linux-kernel@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1698/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Al Viro
2010-09-28 18:50:37 +01:00
committed by Ralf Baechle
parent e5b377a8fb
commit 8f5a00eb42
7 changed files with 34 additions and 35 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
arch/mips/kernel/scall64-64.S
View File

@@ -66,9 +66,9 @@ NESTED(handle_sys64, PT_SIZE, sp)
sd t0, PT_R7(sp) # set error flag
beqz t0, 1f
ld t1, PT_R2(sp) # syscall number
dnegu v0 # error
sd v0, PT_R0(sp) # set flag for syscall
# restarting
sd t1, PT_R0(sp) # save it for syscall restarting
1: sd v0, PT_R2(sp) # result
n64_syscall_exit:
@@ -109,8 +109,9 @@ syscall_trace_entry:
sd t0, PT_R7(sp) # set error flag
beqz t0, 1f
ld t1, PT_R2(sp) # syscall number
dnegu v0 # error
sd v0, PT_R0(sp) # set flag for syscall restarting
sd t1, PT_R0(sp) # save it for syscall restarting
1: sd v0, PT_R2(sp) # result
j syscall_exit