From 639420e9f6cd9ca074732b17ac450d2518d5937f Mon Sep 17 00:00:00 2001 From: Huacai Chen Date: Tue, 6 Feb 2024 12:32:05 +0800 Subject: 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 --- arch/loongarch/mm/kasan_init.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'arch') 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: -- cgit v1.2.3