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Date: Mon, 6 Jan 2014 14:39:11 -0800 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Jiang Liu <jiang.liu@...wei.com>, Jiang Liu <liuj97@...il.com>, Catalin Marinas <catalin.marinas@....com>, Mark Brown <broonie@...nel.org> Subject: [PATCH 3.10 122/129] arm64: fix possible invalid FPSIMD initialization state 3.10-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: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- arch/arm64/kernel/fpsimd.c | 2 ++ 1 file changed, 2 insertions(+) --- a/arch/arm64/kernel/fpsimd.c +++ b/arch/arm64/kernel/fpsimd.c @@ -79,8 +79,10 @@ void fpsimd_thread_switch(struct task_st 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(); } /* -- 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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