[lkml]   [2018]   [Sep]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH v6 03/18] khwasan: add CONFIG_KASAN_GENERIC and CONFIG_KASAN_HW
On Wed, Sep 12, 2018 at 4:47 PM, Dmitry Vyukov <> wrote:
> On Wed, Aug 29, 2018 at 1:35 PM, Andrey Konovalov <> wrote:

>> #define __no_sanitize_address __attribute__((no_sanitize("address")))
>> +#define __no_sanitize_hwaddress __attribute__((no_sanitize("hwaddress")))
> It seems that it would be better to have just 1 attribute for both types.
> Currently __no_sanitize_address is used just in a single place. But if
> it ever used more, people will need to always spell both which looks
> unnecessary, or, worse will only fix asan but forget about khwasan.
> If we do just:
> #define __no_sanitize_address __attribute__((no_sanitize("address",
> "hwaddress")))
> Then we don't need any changes in compiler-gcc.h nor in compiler.h,
> and no chance or forgetting one of them.

Will do in v7.

>> config KASAN
>> - bool "KASan: runtime memory debugger"
>> + bool "KASAN: runtime memory debugger"
>> + help
>> + Enables KASAN (KernelAddressSANitizer) - runtime memory debugger,
>> + designed to find out-of-bounds accesses and use-after-free bugs.
> Perhaps also give link to Documentation/dev-tools/kasan.rst while we are here.

Will do in v7.

>> +
>> +choice
>> + prompt "KASAN mode"
>> + depends on KASAN
>> + default KASAN_GENERIC
>> + help
>> + KASAN has two modes: KASAN (a classic version, similar to userspace
> In these few sentences we call the old mode with 3 different terms:
> "generic", "classic" and "KASAN" :)
> This is somewhat confusing. Let's call it "generic" throughout (here
> and in the docs patch). "Generic" as in "supported on multiple arch
> and not-dependent on hardware features". "Classic" makes sense for
> people who knew KASAN before, but for future readers in won't make
> sense.

Will use "generic" in v7.

> This choice looks somewhat weird on non-arm64. It's kinda a choice
> menu, but one can't really choose anything. Should we put the whole
> choice under HAVE_ARCH_KASAN_HW, and just select KASAN_GENERIC
> otherwise? I don't know what't the practice here. Andrey R?

I think having one option that is auto selected is fine.

>> +config KASAN_HW
>> + bool "KHWASAN: the hardware assisted mode"

Do we need a hyphen here? hardware-assisted?

Yes, will fix in v7.

 \ /
  Last update: 2018-09-17 20:43    [W:0.076 / U:0.216 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site