powerpc/fsl: Flush the branch predictor at each kernel entry (64bit)

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In order to protect against speculation attacks on
indirect branches, the branch predictor is flushed at
kernel entry to protect for the following situations:
- userspace process attacking another userspace process
- userspace process attacking the kernel
Basically when the privillege level change (i.e. the
kernel is entered), the branch predictor state is flushed.

Signed-off-by: Diana Craciun <diana.craciun@nxp.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Diana Craciun 2018-12-12 16:03:05 +02:00 • committed by Michael Ellerman

parent f633a8ad63

commit 10c5e83afd

3 changed files with 37 additions and 1 deletions

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5

arch/powerpc/kernel/entry_64.S

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26

arch/powerpc/kernel/exceptions-64e.S

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7

arch/powerpc/mm/tlb_low_64e.S

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