diff options
| author | Kees Cook <keescook@chromium.org> | 2018-07-02 18:56:21 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-07-03 05:00:54 +0300 |
| commit | 741c5640a15a23a2ec3a0846668a82e8e3b4314d (patch) | |
| tree | 69a78b8ac8f9b9ef3ee70fbc6d90ba1d0e22c146 /arch | |
| parent | d497ebf5fb3a026c0817f8c96cde578787f24093 (diff) | |
| download | linux-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')
| -rw-r--r-- | arch/powerpc/platforms/52xx/mpc52xx_pm.c | 5 |
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); |