From a801d4aa6000f7ba0ffc5ba9d841af62ec7e0bb1 Mon Sep 17 00:00:00 2001 From: Luis Araneda Date: Tue, 30 Jul 2019 00:29:03 -0400 Subject: [RFC PATCH] ARM: zynq: Use memcpy_toio instead of memcpy on smp bring-up This fixes a kernel panic (read overflow) on memcpy when FORTIFY_SOURCE is enabled. The computed size of memcpy args are: - p_size (dst): 4294967295 = (size_t) -1 - q_size (src): 1 - size (len): 8 Additionally, the memory is marked as __iomem, so one of the memcpy_* functions should be used for read/write Signed-off-by: Luis Araneda --- As of 2019-08-03, this patch is under review and waiting comments from the maintainer / author -- arch/arm/mach-zynq/platsmp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/arm/mach-zynq/platsmp.c +++ b/arch/arm/mach-zynq/platsmp.c @@ -65,7 +65,7 @@ int zynq_cpun_start(u32 address, int cpu * 0x4: Jump by mov instruction * 0x8: Jumping address */ - memcpy((__force void *)zero, &zynq_secondary_trampoline, + memcpy_toio(zero, &zynq_secondary_trampoline, trampoline_size); writel(address, zero + trampoline_size);