Messages in this thread | | | From | Andrey Konovalov <> | Date | Fri, 15 Jan 2021 13:48:38 +0100 | Subject | Re: [PATCH v2 2/2] kasan, arm64: fix pointer tags in KASAN reports |
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On Fri, Jan 15, 2021 at 11:49 AM Catalin Marinas <catalin.marinas@arm.com> wrote: > > 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@google.com> > > --- > > 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/
Hi Catalin,
Sorry, Gmail decided to mark all your emails as spam for some reason, so I didn't see any of them :(
I'll fix this in v3.
Thanks!
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