shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-07 19:30:30 +09:00
Code Issues Packages Projects Releases Wiki Activity

powerpc/fsl: Sanitize the syscall table for NXP PowerPC 32 bit platforms

Browse Source 
commit c28218d4ab upstream.

Used barrier_nospec to sanitize the syscall table.

Signed-off-by: Diana Craciun <diana.craciun@nxp.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Diana Craciun
2019-04-11 21:46:12 +10:00
committed by Chris
parent 4953e67e73
commit 4d9ec6a4b7
1 changed files with 10 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
arch/powerpc/kernel/entry_32.S
View File

@@ -34,6 +34,7 @@
#include <asm/ftrace.h>
#include <asm/ptrace.h>
#include <asm/export.h>
#include <asm/barrier.h>
/*
* MSR_KERNEL is > 0x10000 on 4xx/Book-E since it include MSR_CE.
@@ -347,6 +348,15 @@ syscall_dotrace_cont:
ori r10,r10,sys_call_table@l
slwi r0,r0,2
bge- 66f
barrier_nospec_asm
/*
* Prevent the load of the handler below (based on the user-passed
* system call number) being speculatively executed until the test
* against NR_syscalls and branch to .66f above has
* committed.
*/
lwzx r10,r10,r0 /* Fetch system call handler [ptr] */
mtlr r10
addi r9,r1,STACK_FRAME_OVERHEAD