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| author |   Christophe Leroy <christophe.leroy@csgroup.eu> | 2020-05-28 10:17:04 +0000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2020-06-02 20:59:14 +1000 |
| commit | 888468ce725a4cd56d72dc7e5096078f7a9251a0 (patch) | |
| tree | 00397d08d61708c45f3c22a4807bdef1f0826257 | |
| parent | powerpc/uaccess: Don't set KUEP by default on book3s/32 (diff) | |
| download | linux-dev-888468ce725a4cd56d72dc7e5096078f7a9251a0.tar.xz linux-dev-888468ce725a4cd56d72dc7e5096078f7a9251a0.zip | |
powerpc/32: Disable KASAN with pages bigger than 16k
Mapping of early shadow area is implemented by using a single static
page table having all entries pointing to the same early shadow page.
The shadow area must therefore occupy full PGD entries.
The shadow area has a size of 128MB starting at 0xf8000000.
With 4k pages, a PGD entry is 4MB
With 16k pages, a PGD entry is 64MB
With 64k pages, a PGD entry is 1GB which is too big.
Until we rework the early shadow mapping, disable KASAN when the page
size is too big.
Fixes: 2edb16efc899 ("powerpc/32: Add KASAN support")
Cc: stable@vger.kernel.org # v5.2+
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/7195fcde7314ccbf7a081b356084a69d421b10d4.1590660977.git.christophe.leroy@csgroup.eu
| -rw-r--r-- | arch/powerpc/Kconfig | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 1e69cc299547..2d5367afbb5e 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -169,8 +169,8 @@ config PPC select HAVE_ARCH_AUDITSYSCALL select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU select HAVE_ARCH_JUMP_LABEL - select HAVE_ARCH_KASAN if PPC32 - select HAVE_ARCH_KASAN_VMALLOC if PPC32 + select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14 + select HAVE_ARCH_KASAN_VMALLOC if PPC32 && PPC_PAGE_SHIFT <= 14 select HAVE_ARCH_KGDB select HAVE_ARCH_MMAP_RND_BITS select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT |