linux-kernel - Re: [PATCH v6 17/18] khwasan: update kasan documentation

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Message-ID: <CAAeHK+wDhpX_E7cL8D4-BnM4WCT_Bb2Gp6wfqk7+P-4XAoiMOg@mail.gmail.com>
Date:   Tue, 18 Sep 2018 20:42:56 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Christoph Lameter <cl@...ux.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mark Rutland <mark.rutland@....com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Marc Zyngier <marc.zyngier@....com>,
        Dave Martin <dave.martin@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Ingo Molnar <mingo@...nel.org>,
        Paul Lawrence <paullawrence@...gle.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-sparse@...r.kernel.org, Linux-MM <linux-mm@...ck.org>,
        "open list:KERNEL BUILD + fi..." <linux-kbuild@...r.kernel.org>,
        Kostya Serebryany <kcc@...gle.com>,
        Evgeniy Stepanov <eugenis@...gle.com>,
        Lee Smith <Lee.Smith@....com>,
        Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>,
        Jacob Bramley <Jacob.Bramley@....com>,
        Ruben Ayrapetyan <Ruben.Ayrapetyan@....com>,
        Jann Horn <jannh@...gle.com>,
        Mark Brand <markbrand@...gle.com>,
        Chintan Pandya <cpandya@...eaurora.org>,
        Vishwath Mohan <vishwath@...gle.com>
Subject: Re: [PATCH v6 17/18] khwasan: update kasan documentation

On Wed, Sep 12, 2018 at 8:39 PM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
> On Wed, Aug 29, 2018 at 1:35 PM, Andrey Konovalov <andreyknvl@...gle.com> wrote:
>> This patch updates KASAN documentation to reflect the addition of KHWASAN.

>> -Currently KASAN is supported only for the x86_64 and arm64 architectures.
>> +KASAN uses compile-time instrumentation to insert validity checks before every
>> +memory access, and therefore requires a compiler version that supports that.
>> +For classic KASAN you need GCC version 4.9.2 or later. GCC 5.0 or later is
>> +required for detection of out-of-bounds accesses on stack and global variables.
>> +KHWASAN in turns is only supported in clang and requires revision 330044 or
>
> in turn?
>

>> -and choose between CONFIG_KASAN_OUTLINE and CONFIG_KASAN_INLINE. Outline and
>> -inline are compiler instrumentation types. The former produces smaller binary
>> -the latter is 1.1 - 2 times faster. Inline instrumentation requires a GCC
>> +and choose between CONFIG_KASAN_GENERIC (to enable classic KASAN) and
>> +CONFIG_KASAN_HW (to enabled KHWASAN). You also need to choose choose between
>
> to enable
>

>> +     print_address_description+0x73/0x280 mm/kasan/report.c:254
>
>
> KASAN does not print line numbers per se.
> I think we need to show unmodified output to not confuse readers
> (probably remove the useless ? lines).

Will fix all in v7.