Re: [PATCH v3] powerpc/kasan: Fix shadow memory protection with CONFIG_KASAN_VMALLOC
From: Michael Ellerman <hidden>
Date: 2020-03-21 11:37:57
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On Fri, 2020-03-06 at 16:49:49 UTC, Christophe Leroy wrote:
With CONFIG_KASAN_VMALLOC, new page tables are created at the time
shadow memory for vmalloc area in unmapped. If some parts of the
page table still has entries to the zero page shadow memory, the
entries are wrongly marked RW.
With CONFIG_KASAN_VMALLOC, almost the entire kernel address space
is managed by KASAN. To make it simple, just create KASAN page tables
for the entire kernel space at kasan_init(). That doesn't use much
more space, and that's anyway already done for hash platforms.
Fixes: 3d4247fcc938 ("powerpc/32: Add support of KASAN_VMALLOC")
Signed-off-by: Christophe Leroy <redacted>Applied to powerpc fixes, thanks. https://git.kernel.org/powerpc/c/af3d0a68698c7e5df8b72267086b23422a3954bb cheers