linux-kernel - Re: [PATCH] arm64: compat: Provide definition for COMPAT

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Message-ID: <20190730093938.bimxbvhd3alo3u37@willie-the-truck>
Date:   Tue, 30 Jul 2019 10:39:38 +0100
From:   Will Deacon <will@...nel.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, Will Deacon <will.deacon@....com>,
        "# 4 . 9+" <stable@...r.kernel.org>,
        Aurelien Jarno <aurelien@...el32.net>,
        Arnd Bergmann <arnd@...db.de>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Oleg Nesterov <oleg@...hat.com>,
        Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH] arm64: compat: Provide definition for COMPAT_SIGMINSTKSZ

On Tue, Jul 30, 2019 at 11:37:13AM +0200, Greg KH wrote:
> On Tue, Jul 30, 2019 at 10:25:47AM +0100, Will Deacon wrote:
> > From: Will Deacon <will.deacon@....com>
> > 
> > [ Upstream commit 24951465cbd279f60b1fdc2421b3694405bcff42 ]
> > 
> > arch/arm/ defines a SIGMINSTKSZ of 2k, so we should use the same value
> > for compat tasks.
> > 
> > Cc: <stable@...r.kernel.org> # 4.9+
> > Cc: Aurelien Jarno <aurelien@...el32.net>
> > Cc: Arnd Bergmann <arnd@...db.de>
> > Cc: Dominik Brodowski <linux@...inikbrodowski.net>
> > Cc: "Eric W. Biederman" <ebiederm@...ssion.com>
> > Cc: Andrew Morton <akpm@...ux-foundation.org>
> > Cc: Al Viro <viro@...iv.linux.org.uk>
> > Cc: Oleg Nesterov <oleg@...hat.com>
> > Reviewed-by: Dave Martin <Dave.Martin@....com>
> > Reported-by: Steve McIntyre <steve.mcintyre@....com>
> > Tested-by: Steve McIntyre <93sam@...ian.org>
> > Signed-off-by: Will Deacon <will.deacon@....com>
> > Signed-off-by: Catalin Marinas <catalin.marinas@....com>
> > ---
> > 
> > Aurelien points out that this didn't get selected for -stable despite its
> > counterpart (22839869f21a ("signal: Introduce COMPAT_SIGMINSTKSZ for use
> > in compat_sys_sigaltstack")) being backported to 4.9. Oops.
> 
> So this needs to go into 4.9.y, 4.14.y, and 4.19.y?

Yes, please.

Will