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

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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>
This commit is contained in:
Diana Craciun 2018-07-28 09:06:38 +10:00 committed by Michael Ellerman
parent ebcd1bfc33
commit c28218d4ab
1 changed files with 10 additions and 0 deletions
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arch/powerpc/kernel/entry_32.S
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@ -35,6 +35,7 @@
#include <asm/export.h>
#include <asm/asm-405.h>
#include <asm/feature-fixups.h>
#include <asm/barrier.h>
/*
* MSR_KERNEL is > 0x10000 on 4xx/Book-E since it include MSR_CE.
@ -360,6 +361,15 @@ 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