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Date: Mon, 13 Jan 2014 15:59:32 +0000 From: Luis Henriques <luis.henriques@...onical.com> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, kernel-team@...ts.ubuntu.com Cc: Jiang Liu <jiang.liu@...wei.com>, Jiang Liu <liuj97@...il.com>, Catalin Marinas <catalin.marinas@....com>, Mark Brown <broonie@...nel.org>, Luis Henriques <luis.henriques@...onical.com> Subject: [PATCH 3.11 131/208] arm64: fix possible invalid FPSIMD initialization state 3.11.10.3 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Jiang Liu <jiang.liu@...wei.com> commit 6db83cea1c975b9a102e17def7d2795814e1ae2b upstream. If context switching happens during executing fpsimd_flush_thread(), stale value in FPSIMD registers will be saved into current thread's fpsimd_state by fpsimd_thread_switch(). That may cause invalid initialization state for the new process, so disable preemption when executing fpsimd_flush_thread(). Signed-off-by: Jiang Liu <jiang.liu@...wei.com> Cc: Jiang Liu <liuj97@...il.com> Signed-off-by: Catalin Marinas <catalin.marinas@....com> Cc: Mark Brown <broonie@...nel.org> Signed-off-by: Luis Henriques <luis.henriques@...onical.com> --- arch/arm64/kernel/fpsimd.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c index e8b8357..2fa308e 100644 --- a/arch/arm64/kernel/fpsimd.c +++ b/arch/arm64/kernel/fpsimd.c @@ -79,8 +79,10 @@ void fpsimd_thread_switch(struct task_struct *next) void fpsimd_flush_thread(void) { + preempt_disable(); memset(¤t->thread.fpsimd_state, 0, sizeof(struct fpsimd_state)); fpsimd_load_state(¤t->thread.fpsimd_state); + preempt_enable(); } /* -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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