Re: [PATCH v2 2/5] ARM: vdso: Don't use gcc plugins for building vgettimeofday.c

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Subject: Re: [PATCH v2 2/5] ARM: vdso: Don't use gcc plugins for building vgettimeofday.c
From: Alexander Popov <alex.popov@xxxxxxxxx>
Date: Wed, 24 Jun 2020 15:56:54 +0300
Cc: Kees Cook <keescook@xxxxxxxxxxxx>, Jann Horn <jannh@xxxxxxxxxx>, Emese Revfy <re.emese@xxxxxxxxx>, Miguel Ojeda <miguel.ojeda.sandonis@xxxxxxxxx>, Masahiro Yamada <masahiroy@xxxxxxxxxx>, Michal Marek <michal.lkml@xxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>, Thiago Jung Bauermann <bauerman@xxxxxxxxxxxxx>, Jessica Yu <jeyu@xxxxxxxxxx>, Sven Schnelle <svens@xxxxxxxxxxxxxx>, Iurii Zaikin <yzaikin@xxxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Vincenzo Frascino <vincenzo.frascino@xxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Peter Collingbourne <pcc@xxxxxxxxxx>, Naohiro Aota <naohiro.aota@xxxxxxx>, Alexander Monakov <amonakov@xxxxxxxxx>, Mathias Krause <minipli@xxxxxxxxxxxxxx>, PaX Team <pageexec@xxxxxxxxxxx>, Brad Spengler <spender@xxxxxxxxxxxxxx>, Laura Abbott <labbott@xxxxxxxxxx>, Florian Weimer <fweimer@xxxxxxxxxx>, kernel-hardening@xxxxxxxxxxxxxxxxxx, linux-kbuild@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, gcc@xxxxxxxxxxx, notify@xxxxxxxxxx
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On 24.06.2020 15:52, Luis Chamberlain wrote:
> On Wed, Jun 24, 2020 at 03:33:27PM +0300, Alexander Popov wrote:
>> Don't use gcc plugins for building arch/arm/vdso/vgettimeofday.c to
>> avoid unneeded instrumentation.
>>
>> Signed-off-by: Alexander Popov <alex.popov@xxxxxxxxx>
> 
> But why is skipping it safe?

Hello Luis,

Kees and Will discussed that in detail in v1 of the series:
https://lore.kernel.org/lkml/20200610073046.GA15939@willie-the-truck/

Best regards,
Alexander

References:
- [PATCH v2 0/5] Improvements of the stackleak gcc plugin
  - From: Alexander Popov
- [PATCH v2 2/5] ARM: vdso: Don't use gcc plugins for building vgettimeofday.c
  - From: Alexander Popov
- Re: [PATCH v2 2/5] ARM: vdso: Don't use gcc plugins for building vgettimeofday.c
  - From: Luis Chamberlain

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