target/linux/zynq/patches-4.19/110-ARM-zynq-Use-memcpy_toio-instead-of-memcpy.patch

   1 From a801d4aa6000f7ba0ffc5ba9d841af62ec7e0bb1 Mon Sep 17 00:00:00 2001
   2 From: Luis Araneda <luaraneda@gmail.com>
   3 Date: Tue, 30 Jul 2019 00:29:03 -0400
   4 Subject: [RFC PATCH] ARM: zynq: Use memcpy_toio instead of memcpy on smp bring-up
   5
   6 This fixes a kernel panic (read overflow) on memcpy when
   7 FORTIFY_SOURCE is enabled.
   8
   9 The computed size of memcpy args are:
  10 - p_size (dst): 4294967295 = (size_t) -1
  11 - q_size (src): 1
  12 - size (len): 8
  13
  14 Additionally, the memory is marked as __iomem, so one of
  15 the memcpy_* functions should be used for read/write
  16
  17 Signed-off-by: Luis Araneda <luaraneda@gmail.com>
  18 ---
  19 As of 2019-08-03, this patch is under review and waiting
  20 comments from the maintainer / author
  21 --
  22  arch/arm/mach-zynq/platsmp.c | 2 +-
  23  1 file changed, 1 insertion(+), 1 deletion(-)
  24
  25 --- a/arch/arm/mach-zynq/platsmp.c
  26 +++ b/arch/arm/mach-zynq/platsmp.c
  27 @@ -65,7 +65,7 @@ int zynq_cpun_start(u32 address, int cpu
  28                         * 0x4: Jump by mov instruction
  29                         * 0x8: Jumping address
  30                         */
  31 -                       memcpy((__force void *)zero, &zynq_secondary_trampoline,
  32 +                       memcpy_toio(zero, &zynq_secondary_trampoline,
  33                                                         trampoline_size);
  34                         writel(address, zero + trampoline_size);
  35