From: Vincenzo Frascino <vincenzo.frascino@arm.com>
To: Andrey Konovalov <andreyknvl@google.com>
Cc: Linux ARM <linux-arm-kernel@lists.infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
kasan-dev <kasan-dev@googlegroups.com>,
Andrew Morton <akpm@linux-foundation.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Dmitry Vyukov <dvyukov@google.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Alexander Potapenko <glider@google.com>,
Marco Elver <elver@google.com>,
Evgenii Stepanov <eugenis@google.com>,
Branislav Rankov <Branislav.Rankov@arm.com>
Subject: Re: [PATCH v9 3/4] kasan: Add report for async mode
Date: Fri, 29 Jan 2021 17:48:12 +0000 [thread overview]
Message-ID: <77de8e48-6f68-bf27-0bed-02e49b69a12d@arm.com> (raw)
In-Reply-To: <CAAeHK+xAbsX9Zz4aKXToNTrbgrrYck23ohGJHXvgeSTyZy=Odg@mail.gmail.com>
On 1/29/21 5:40 PM, Andrey Konovalov wrote:
> On Tue, Jan 26, 2021 at 2:46 PM Vincenzo Frascino
> <vincenzo.frascino@arm.com> wrote:
>>
>> KASAN provides an asynchronous mode of execution.
>>
>> Add reporting functionality for this mode.
>>
>> Cc: Dmitry Vyukov <dvyukov@google.com>
>> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
>> Cc: Alexander Potapenko <glider@google.com>
>> Cc: Andrey Konovalov <andreyknvl@google.com>
>> Reviewed-by: Andrey Konovalov <andreyknvl@google.com>
>> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
>> ---
>> include/linux/kasan.h | 6 ++++++
>> mm/kasan/report.c | 13 +++++++++++++
>> 2 files changed, 19 insertions(+)
>>
>> diff --git a/include/linux/kasan.h b/include/linux/kasan.h
>> index bb862d1f0e15..b6c502dad54d 100644
>> --- a/include/linux/kasan.h
>> +++ b/include/linux/kasan.h
>> @@ -360,6 +360,12 @@ static inline void *kasan_reset_tag(const void *addr)
>>
>> #endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS*/
>>
>> +#ifdef CONFIG_KASAN_HW_TAGS
>> +
>> +void kasan_report_async(void);
>> +
>> +#endif /* CONFIG_KASAN_HW_TAGS */
>> +
>> #ifdef CONFIG_KASAN_SW_TAGS
>> void __init kasan_init_sw_tags(void);
>> #else
>> diff --git a/mm/kasan/report.c b/mm/kasan/report.c
>> index 87b271206163..69bad9c01aed 100644
>> --- a/mm/kasan/report.c
>> +++ b/mm/kasan/report.c
>> @@ -360,6 +360,19 @@ void kasan_report_invalid_free(void *object, unsigned long ip)
>> end_report(&flags, (unsigned long)object);
>> }
>>
>> +#ifdef CONFIG_KASAN_HW_TAGS
>> +void kasan_report_async(void)
>> +{
>> + unsigned long flags;
>> +
>> + start_report(&flags);
>> + pr_err("BUG: KASAN: invalid-access\n");
>> + pr_err("Asynchronous mode enabled: no access details available\n");
>> + dump_stack();
>> + end_report(&flags);
>
> This conflicts with "kasan: use error_report_end tracepoint" that's in mm.
>
> I suggest to call end_report(&flags, 0) here and check addr !=0 in
> end_report() before calling trace_error_report_end().
>
I just noticed and about to post a rebased version with end_report(&flags, 0).
>> +}
>> +#endif /* CONFIG_KASAN_HW_TAGS */
>> +
>> static void __kasan_report(unsigned long addr, size_t size, bool is_write,
>> unsigned long ip)
>> {
>> --
>> 2.30.0
>>
--
Regards,
Vincenzo
next prev parent reply other threads:[~2021-01-29 17:47 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-26 13:45 [PATCH v9 0/4] arm64: ARMv8.5-A: MTE: Add async mode support Vincenzo Frascino
2021-01-26 13:46 ` [PATCH v9 1/4] arm64: mte: Add asynchronous " Vincenzo Frascino
2021-01-26 13:46 ` [PATCH v9 2/4] kasan: Add KASAN mode kernel parameter Vincenzo Frascino
2021-01-26 13:46 ` [PATCH v9 3/4] kasan: Add report for async mode Vincenzo Frascino
2021-01-29 17:40 ` Andrey Konovalov
2021-01-29 17:48 ` Vincenzo Frascino [this message]
2021-01-29 17:56 ` Andrey Konovalov
2021-01-29 18:01 ` Vincenzo Frascino
2021-01-29 18:10 ` Andrey Konovalov
2021-01-29 18:18 ` Vincenzo Frascino
2021-01-29 18:00 ` Vincenzo Frascino
2021-01-29 18:09 ` Andrey Konovalov
2021-01-29 18:16 ` Vincenzo Frascino
2021-01-29 18:46 ` Vincenzo Frascino
2021-01-29 18:44 ` Andrey Konovalov
2021-01-26 13:46 ` [PATCH v9 4/4] arm64: mte: Enable async tag check fault Vincenzo Frascino
2021-01-27 20:00 ` [PATCH v9 0/4] arm64: ARMv8.5-A: MTE: Add async mode support Andrey Konovalov
2021-01-27 22:19 ` Will Deacon
2021-01-29 17:54 ` Vincenzo Frascino
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