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authorHuacai Chen <chenhuacai@loongson.cn>2024-02-06 07:32:05 +0300
committerHuacai Chen <chenhuacai@loongson.cn>2024-02-06 07:32:05 +0300
commit639420e9f6cd9ca074732b17ac450d2518d5937f (patch)
tree97197e984a6c3ce9439dce4ea4278d175a71faf4 /arch
parent4551b30525cf3d2f026b92401ffe241eb04dfebe (diff)
downloadlinux-639420e9f6cd9ca074732b17ac450d2518d5937f.tar.xz
LoongArch: Fix earlycon parameter if KASAN enabled
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: 5aa4ac64e6add3e ("LoongArch: Add KASAN (Kernel Address Sanitizer) support") Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch')
-rw-r--r--arch/loongarch/mm/kasan_init.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/loongarch/mm/kasan_init.c b/arch/loongarch/mm/kasan_init.c
index cc3e81fe0186..c608adc99845 100644
--- a/arch/loongarch/mm/kasan_init.c
+++ b/arch/loongarch/mm/kasan_init.c
@@ -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: