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LoongArch: Fix earlycon parameter if KASAN enabled

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commit 639420e9f6 upstream.

The earlycon parameter is based on fixmap, and fixmap addresses are not
supposed to be shadowed by KASAN. So return the kasan_early_shadow_page
in kasan_mem_to_shadow() if the input address is above FIXADDR_START.
Otherwise earlycon cannot work after kasan_init().

Cc: stable@vger.kernel.org
Fixes: 5aa4ac64e6 ("LoongArch: Add KASAN (Kernel Address Sanitizer) support")
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Huacai Chen 2024-02-06 12:32:05 +08:00 committed by Greg Kroah-Hartman
parent 4d850ed747
commit 496273439b
1 changed files with 3 additions and 0 deletions
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3
arch/loongarch/mm/kasan_init.c
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@ -44,6 +44,9 @@ void *kasan_mem_to_shadow(const void *addr)
unsigned long xrange = (maddr >> XRANGE_SHIFT) & 0xffff;
unsigned long offset = 0;
if (maddr >= FIXADDR_START)
return (void *)(kasan_early_shadow_page);
maddr &= XRANGE_SHADOW_MASK;
switch (xrange) {
case XKPRANGE_CC_SEG: