Messages in this thread Patch in this message | | | From | Andrey Konovalov <> | Subject | [PATCH v4 08/17] khwasan, arm64: fix up fault handling logic | Date | Tue, 26 Jun 2018 15:15:18 +0200 |
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show_pte in arm64 fault handling relies on the fact that the top byte of a kernel pointer is 0xff, which isn't always the case with KHWASAN enabled. Reset the top byte.
Signed-off-by: Andrey Konovalov <andreyknvl@google.com> --- arch/arm64/mm/fault.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index b8eecc7b9531..b7b152783d54 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -32,6 +32,7 @@ #include <linux/perf_event.h> #include <linux/preempt.h> #include <linux/hugetlb.h> +#include <linux/kasan.h> #include <asm/bug.h> #include <asm/cmpxchg.h> @@ -134,6 +135,8 @@ void show_pte(unsigned long addr) pgd_t *pgdp; pgd_t pgd; + addr = (unsigned long)khwasan_reset_tag((void *)addr); + if (addr < TASK_SIZE) { /* TTBR0 */ mm = current->active_mm; -- 2.18.0.rc2.346.g013aa6912e-goog
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