On Thu, Jan 14, 2021 at 08:33:57PM +0100, Andrey Konovalov wrote: > As of the "arm64: expose FAR_EL1 tag bits in siginfo" patch, the address > that is passed to report_tag_fault has pointer tags in the format of 0x0X, > while KASAN uses 0xFX format (note the difference in the top 4 bits). > > Fix up the pointer tag before calling kasan_report. > > Link: https://linux-review.googlesource.com/id/I9ced973866036d8679e8f4ae325de547eb969649 > Fixes: dceec3ff7807 ("arm64: expose FAR_EL1 tag bits in siginfo") > Fixes: 4291e9ee6189 ("kasan, arm64: print report from tag fault handler") > Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx> > --- > arch/arm64/mm/fault.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c > index 3c40da479899..a218f6f2fdc8 100644 > --- a/arch/arm64/mm/fault.c > +++ b/arch/arm64/mm/fault.c > @@ -304,6 +304,8 @@ static void report_tag_fault(unsigned long addr, unsigned int esr, > { > bool is_write = ((esr & ESR_ELx_WNR) >> ESR_ELx_WNR_SHIFT) != 0; > > + /* The format of KASAN tags is 0xF<x>. */ > + addr |= (0xF0UL << MTE_TAG_SHIFT); > /* > * SAS bits aren't set for all faults reported in EL1, so we can't > * find out access size. I already replied here but I don't see any change in v2: https://lore.kernel.org/linux-arm-kernel/20210113165441.GC27045@gaia/ -- Catalin
