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

[Andrey Konovalov <andreyknvl@google.com>]

On Wed, Sep 12, 2018 at 8:39 PM, Dmitry Vyukov <dvyukov@google.com> wrote:
> On Wed, Aug 29, 2018 at 1:35 PM, Andrey Konovalov <andreyknvl@google.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.