Commit 8130b9d7 authored Jan 30, 2012 by Will Deacon Committed by Russell King Feb 02, 2012

ARM: 7308/1: vfp: flush thread hwstate before copying ptrace registers



If we are context switched whilst copying into a thread's
vfp_hard_struct then the partial copy may be corrupted by the VFP
context switching code (see "ARM: vfp: flush thread hwstate before
restoring context from sigframe").

This patch updates the ptrace VFP set code so that the thread state is
flushed before the copy, therefore disabling VFP and preventing
corruption from occurring.

Cc: stable <stable@vger.kernel.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

parent 247f4993

arch/arm/kernel/ptrace.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -726,8 +726,8 @@ static int vfp_set(struct task_struct *target,
		if (ret)
		return ret;

		thread->vfpstate.hard = new_vfp;
		vfp_flush_hwstate(thread);
		thread->vfpstate.hard = new_vfp;

		return 0;
		}

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