From: Maciej W. Rozycki Date: Thu, 12 May 2016 09:18:27 +0000 (+0100) Subject: MIPS: ptrace: Fix FP context restoration FCSR regression X-Git-Tag: v4.7~225^2~72 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4249548454f7ba4581aeee26bd83f42b48a14d15;p=platform%2Fkernel%2Flinux-amlogic.git MIPS: ptrace: Fix FP context restoration FCSR regression Fix a floating-point context restoration regression introduced with commit 9b26616c8d9d ("MIPS: Respect the ISA level in FCSR handling") that causes a Floating Point exception and consequently a kernel oops with hard float configurations when one or more FCSR Enable and their corresponding Cause bits are set both at a time via a ptrace(2) call. To do so reinstate Cause bit masking originally introduced with commit b1442d39fac2 ("MIPS: Prevent user from setting FCSR cause bits") to address this exact problem and then inadvertently removed from the PTRACE_SETFPREGS request with the commit referred above. Signed-off-by: Maciej W. Rozycki Cc: stable@vger.kernel.org # v4.0+ Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/13238/ Signed-off-by: Ralf Baechle --- diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c index 48c0534..88a1920 100644 --- a/arch/mips/kernel/ptrace.c +++ b/arch/mips/kernel/ptrace.c @@ -176,6 +176,7 @@ int ptrace_setfpregs(struct task_struct *child, __u32 __user *data) } __get_user(value, data + 64); + value &= ~FPU_CSR_ALL_X; fcr31 = child->thread.fpu.fcr31; mask = boot_cpu_data.fpu_msk31; child->thread.fpu.fcr31 = (value & ~mask) | (fcr31 & mask);