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Revert "powerpc/kasan: Fix shadow pages allocation failure"

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commit b506923ee4 upstream.

This reverts commit d2a91cef9b.

This commit moved too much work in kasan_init(). The allocation
of shadow pages has to be moved for the reason explained in that
patch, but the allocation of page tables still need to be done
before switching to the final hash table.

First revert the incorrect commit, following patch redoes it
properly.

Fixes: d2a91cef9b ("powerpc/kasan: Fix shadow pages allocation failure")
Cc: stable@vger.kernel.org
Reported-by: Erhard F. <erhard_f@mailbox.org>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=208181
Link: https://lore.kernel.org/r/3667deb0911affbf999b99f87c31c77d5e870cd2.1593690707.git.christophe.leroy@csgroup.eu
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christophe Leroy 2020-07-02 11:52:02 +00:00 committed by Greg Kroah-Hartman
parent 11e64146dc
commit ceff42e6c1
3 changed files with 5 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
arch/powerpc/include/asm/kasan.h
View file

@ -27,9 +27,11 @@
#ifdef CONFIG_KASAN
void kasan_early_init(void);
void kasan_mmu_init(void);
void kasan_init(void);
#else
static inline void kasan_init(void) { }
static inline void kasan_mmu_init(void) { }
#endif
#endif /* __ASSEMBLY */

2
arch/powerpc/mm/init_32.c
View file

@ -175,6 +175,8 @@ void __init MMU_init(void)
btext_unmap();
#endif
kasan_mmu_init();
setup_kup();
/* Shortly after that, the entire linear mapping will be available */

4
arch/powerpc/mm/kasan/kasan_init_32.c
View file

@ -129,7 +129,7 @@ static void __init kasan_remap_early_shadow_ro(void)
flush_tlb_kernel_range(KASAN_SHADOW_START, KASAN_SHADOW_END);
}
static void __init kasan_mmu_init(void)
void __init kasan_mmu_init(void)
{
int ret;
struct memblock_region *reg;
@ -156,8 +156,6 @@ static void __init kasan_mmu_init(void)
void __init kasan_init(void)
{
kasan_mmu_init();
kasan_remap_early_shadow_ro();
clear_page(kasan_early_shadow_page);