linux-kernel - Re: [STABLE BACKPORT v2 4.4.y, 4.9.y and 4.14.y] compiler.h: Raise minimum version of GCC to 5.1 for arm64

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Date:   Mon, 25 Jan 2021 09:45:30 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Will Deacon <will@...nel.org>, "# 3.4.x" <stable@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...nel.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Theodore Ts'o" <tytso@....edu>,
        Florian Weimer <fweimer@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>
Subject: Re: [STABLE BACKPORT v2 4.4.y, 4.9.y and 4.14.y] compiler.h: Raise
 minimum version of GCC to 5.1 for arm64

On Mon, Jan 25, 2021 at 6:34 AM Greg KH <gregkh@...uxfoundation.org> wrote:
>
> On Mon, Jan 25, 2021 at 01:24:25PM +0000, Will Deacon wrote:
> > commit dca5244d2f5b94f1809f0c02a549edf41ccd5493 upstream.
> >
> > GCC versions >= 4.9 and < 5.1 have been shown to emit memory references
> > beyond the stack pointer, resulting in memory corruption if an interrupt
> > is taken after the stack pointer has been adjusted but before the
> > reference has been executed. This leads to subtle, infrequent data
> > corruption such as the EXT4 problems reported by Russell King at the
> > link below.
> >
> > Life is too short for buggy compilers, so raise the minimum GCC version
> > required by arm64 to 5.1.
> >
> > Reported-by: Russell King <linux@...linux.org.uk>
> > Suggested-by: Arnd Bergmann <arnd@...nel.org>
> > Signed-off-by: Will Deacon <will@...nel.org>
> > Tested-by: Nathan Chancellor <natechancellor@...il.com>
> > Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
> > Reviewed-by: Nathan Chancellor <natechancellor@...il.com>
> > Acked-by: Linus Torvalds <torvalds@...ux-foundation.org>
> > Cc: <stable@...r.kernel.org> # 4.4.y, 4.9.y and 4.14.y only
> > Cc: Theodore Ts'o <tytso@....edu>
> > Cc: Florian Weimer <fweimer@...hat.com>
> > Cc: Peter Zijlstra <peterz@...radead.org>
> > Cc: Nick Desaulniers <ndesaulniers@...gle.com>
> > Cc: Nathan Chancellor <natechancellor@...il.com>
> > Cc: Naresh Kamboju <naresh.kamboju@...aro.org>
> > Link: https://lore.kernel.org/r/20210105154726.GD1551@shell.armlinux.org.uk
> > Link: https://lore.kernel.org/r/20210112224832.10980-1-will@kernel.org
> > Signed-off-by: Catalin Marinas <catalin.marinas@....com>
> > [will: backport to 4.4.y/4.9.y/4.14.y; add __clang__ check]

LGTM

> > Link: https://lore.kernel.org/r/CA+G9fYuzE9WMSB7uGjV4gTzK510SHEdJb_UXQCzsQ5MqA=h9SA@mail.gmail.com
> > Signed-off-by: Will Deacon <will@...nel.org>
> > ---
> >  include/linux/compiler-gcc.h | 6 ++++++
> >  1 file changed, 6 insertions(+)
>
> Thanks, now queued up, let's try this again :)
>
> greg k-h



-- 
Thanks,
~Nick Desaulniers