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dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=JcizD01U3GUGoJVEvEGzqOvMpF6PFVNLSkrranuF0EM=; b=ywZA6Rjpw6EmkVuI5zrhvAH2W 06JG3Cc2lhwbxwLjEBdfNU74pQje9JgpBt/5zmF4Ibyig9m7mkZLaaL6LZjLTf8HidhDz7/baWVP/ R1bllqgNtqavEqd8O0DqVqu9hw74V4oAs09Yo9BRLJXDO/Ymm78y+9+MiH2pkqDJBQCLFza9NNpIA QCuPnafQeEe5D87wowtuqZu+mHcWXNXtLY+fgwj/JLSNnshTT0fVCsKsGjxJ/nS5/2QTQ2TUc69BM RIRMOP5i94K3A1bbg13ICIKu/EkVDAbSoPBAfmth+I1rOmHb86APFbQv5a2w6//tE6iB8PAMgb1pI MRnLUNKBQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1l5Y1p-0005bh-8p; Fri, 29 Jan 2021 17:57:53 +0000 Received: from foss.arm.com ([217.140.110.172]) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1l5Y1m-0005b9-RQ for linux-arm-kernel@lists.infradead.org; Fri, 29 Jan 2021 17:57:51 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id AD3C913A1; Fri, 29 Jan 2021 09:57:38 -0800 (PST) Received: from [10.37.12.11] (unknown [10.37.12.11]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 956A93F885; Fri, 29 Jan 2021 09:57:36 -0800 (PST) Subject: Re: [PATCH v9 3/4] kasan: Add report for async mode To: Andrey Konovalov References: <20210126134603.49759-1-vincenzo.frascino@arm.com> <20210126134603.49759-4-vincenzo.frascino@arm.com> <77de8e48-6f68-bf27-0bed-02e49b69a12d@arm.com> From: Vincenzo Frascino Message-ID: <7da762df-6df3-e526-bec1-dc770709c00c@arm.com> Date: Fri, 29 Jan 2021 18:01:32 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210129_125751_029873_E6A79A1C X-CRM114-Status: GOOD ( 18.21 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Branislav Rankov , Marco Elver , Catalin Marinas , Evgenii Stepanov , LKML , kasan-dev , Alexander Potapenko , Dmitry Vyukov , Andrey Ryabinin , Andrew Morton , Will Deacon , Linux ARM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 1/29/21 5:56 PM, Andrey Konovalov wrote: > On Fri, Jan 29, 2021 at 6:44 PM Vincenzo Frascino > wrote: >> >> >> >> On 1/29/21 5:40 PM, Andrey Konovalov wrote: >>> On Tue, Jan 26, 2021 at 2:46 PM Vincenzo Frascino >>> wrote: >>>> >>>> KASAN provides an asynchronous mode of execution. >>>> >>>> Add reporting functionality for this mode. >>>> >>>> Cc: Dmitry Vyukov >>>> Cc: Andrey Ryabinin >>>> Cc: Alexander Potapenko >>>> Cc: Andrey Konovalov >>>> Reviewed-by: Andrey Konovalov >>>> Signed-off-by: Vincenzo Frascino >>>> --- >>>> 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"); > > Could you also add an empty line here before the stack trace while at it? > Sure no problem. >>>> + 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 -- Regards, Vincenzo _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel