powerpc/perf: Ensure all EBB register state is cleared on fork()

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commit 3df48c981d upstream.

In commit 330a1eb "Core EBB support for 64-bit book3s" I messed up
clear_task_ebb(). It clears some but not all of the task's Event Based
Branch (EBB) registers when we duplicate a task struct.

That allows a child task to observe the EBBHR & EBBRR of its parent,
which it should not be able to do.

Fix it by clearing EBBHR & EBBRR.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Michael Ellerman 2014-06-10 16:46:21 +10:00 • committed by Greg Kroah-Hartman

parent 8ae1bea305

commit feb6334d1c

1 changed files with 2 additions and 0 deletions

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arch/powerpc/include/asm/switch_to.h

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