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Commit c28218d4 authored by Diana Craciun's avatar Diana Craciun Committed by Michael Ellerman
Browse files

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



Used barrier_nospec to sanitize the syscall table.

Signed-off-by: default avatarDiana Craciun <diana.craciun@nxp.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent ebcd1bfc

arch/powerpc/kernel/entry_32.S

+10 −0
Original line number Diff line number Diff line
@@ -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