linux-kernel - Re: [PATCH v5 3/6] kasan: Add report for async mode

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Date:   Fri, 22 Jan 2021 13:38:38 +0000
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com, Will Deacon <will@...nel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCH v5 3/6] kasan: Add report for async mode



On 1/22/21 1:27 PM, Vincenzo Frascino wrote:
>> It looks like the original kasan_report() prototype is declared in two
>> places (second one in mm/kasan/kasan.h). I'd remove the latter and try
>> to have a consistent approach for kasan_report() and
>> kasan_report_async().
>>
> Ok, I will remove it.

I just realized that the internal interface exposes the kasan_report() interface
for the GENERIC KASAN implementation. If I remove it that does not work anymore:

/data1/Projects/LinuxKernel/linux-mte/mm/kasan/common.c: In function
‘__kasan_check_byte’:
/data1/Projects/LinuxKernel/linux-mte/mm/kasan/common.c:503:17: error: implicit
declaration of function ‘kasan_report’ [-Werror=implicit-function-declaration]
  503 |                 kasan_report((unsigned long)address, 1, false, ip);
      |                 ^~~~~~~~~~~~
/data1/Projects/LinuxKernel/linux-mte/mm/kasan/generic.c: In function
‘check_region_inline’:
/data1/Projects/LinuxKernel/linux-mte/mm/kasan/generic.c:170:25: error: implicit
declaration of function ‘kasan_report’ [-Werror=implicit-function-declaration]
  170 |                 return !kasan_report(addr, size, write, ret_ip);
      |                         ^~~~~~~~~~~~
/data1/Projects/LinuxKernel/linux-mte/mm/kasan/report_generic.c: In function
‘__asan_report_load1_noabort’:
/data1/Projects/LinuxKernel/linux-mte/mm/kasan/report_generic.c:295:9: error:
implicit declaration of function ‘kasan_report’
[-Werror=implicit-function-declaration]
  295 |         kasan_report(addr, size, false, _RET_IP_);        \
      |         ^~~~~~~~~~~~
/data1/Projects/LinuxKernel/linux-mte/mm/kasan/report_generic.c:306:1: note: in
expansion of macro ‘DEFINE_ASAN_REPORT_LOAD’
  306 | DEFINE_ASAN_REPORT_LOAD(1);

To do that cleanly few things need to be shuffled around, Andrey or I can take
care of it but if you agree we shall look into this after -rc1.

Thanks!

-- 
Regards,
Vincenzo