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 <[email protected]> Signed-off-by: Will Deacon <[email protected]> KernelVersion: 3.3-rc1 --- arch/arm/kernel/ptrace.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c index d001be4..e33870f 100644 --- a/arch/arm/kernel/ptrace.c +++ b/arch/arm/kernel/ptrace.c @@ -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; } -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
