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| author |   Diana Craciun <diana.craciun@nxp.com> | 2018-07-28 09:06:38 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2018-08-08 00:32:24 +1000 |
| commit | c28218d4abbf4f2035495334d8bfcba64bda4787 (patch) | |
| tree | 3a07d01fe381d4d2a5221933aa47efe88a8b5b90 /arch/powerpc/kernel/entry_32.S | |
| parent | powerpc/fsl: Add barrier_nospec implementation for NXP PowerPC Book3E (diff) | |
| download | linux-dev-c28218d4abbf4f2035495334d8bfcba64bda4787.tar.xz linux-dev-c28218d4abbf4f2035495334d8bfcba64bda4787.zip | |
powerpc/fsl: Sanitize the syscall table for NXP PowerPC 32 bit platforms
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>
Diffstat (limited to 'arch/powerpc/kernel/entry_32.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_32.S | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S index 3bd097be90d9..e58c3f467db5 100644 --- a/arch/powerpc/kernel/entry_32.S +++ b/arch/powerpc/kernel/entry_32.S @@ -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 |