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authorKees Cook <keescook@chromium.org>2018-07-02 18:56:21 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2018-07-03 05:00:54 +0300
commit741c5640a15a23a2ec3a0846668a82e8e3b4314d (patch)
tree69a78b8ac8f9b9ef3ee70fbc6d90ba1d0e22c146 /arch/powerpc/platforms/52xx
parentd497ebf5fb3a026c0817f8c96cde578787f24093 (diff)
downloadlinux-741c5640a15a23a2ec3a0846668a82e8e3b4314d.tar.xz
powerpc/mpc5200: Remove VLA usage
In the quest to remove all stack VLA usage from the kernel[1], this switches to using a stack size large enough for the saved routine and adds a sanity check making sure the routine doesn't overflow into the 0x600 exception handler. [1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/platforms/52xx')
-rw-r--r--arch/powerpc/platforms/52xx/mpc52xx_pm.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/52xx/mpc52xx_pm.c b/arch/powerpc/platforms/52xx/mpc52xx_pm.c
index 31d3515672f3..b1d208ded981 100644
--- a/arch/powerpc/platforms/52xx/mpc52xx_pm.c
+++ b/arch/powerpc/platforms/52xx/mpc52xx_pm.c
@@ -117,7 +117,10 @@ int mpc52xx_pm_enter(suspend_state_t state)
u32 intr_main_mask;
void __iomem * irq_0x500 = (void __iomem *)CONFIG_KERNEL_START + 0x500;
unsigned long irq_0x500_stop = (unsigned long)irq_0x500 + mpc52xx_ds_cached_size;
- char saved_0x500[mpc52xx_ds_cached_size];
+ char saved_0x500[0x600-0x500];
+
+ if (WARN_ON(mpc52xx_ds_cached_size > sizeof(saved_0x500)))
+ return -ENOMEM;
/* disable all interrupts in PIC */
intr_main_mask = in_be32(&intr->main_mask);