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Date:   Tue, 30 Jul 2019 10:39:38 +0100
From:   Will Deacon <will@kernel.org>
To:     Greg KH <gregkh@linuxfoundation.org>
Cc:     linux-kernel@vger.kernel.org, Will Deacon <will.deacon@arm.com>,
        "# 4 . 9+" <stable@vger.kernel.org>,
        Aurelien Jarno <aurelien@aurel32.net>,
        Arnd Bergmann <arnd@arndb.de>,
        Dominik Brodowski <linux@dominikbrodowski.net>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Al Viro <viro@zeniv.linux.org.uk>,
        Oleg Nesterov <oleg@redhat.com>,
        Catalin Marinas <catalin.marinas@arm.com>
Subject: Re: [PATCH] arm64: compat: Provide definition for COMPAT_SIGMINSTKSZ
Message-ID: <20190730093938.bimxbvhd3alo3u37@willie-the-truck>
References: <20190730092547.1284-1-will@kernel.org>
 <20190730093713.GB15402@kroah.com>
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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@arm.com>
> > 
> > [ Upstream commit 24951465cbd279f60b1fdc2421b3694405bcff42 ]
> > 
> > arch/arm/ defines a SIGMINSTKSZ of 2k, so we should use the same value
> > for compat tasks.
> > 
> > Cc: <stable@vger.kernel.org> # 4.9+
> > Cc: Aurelien Jarno <aurelien@aurel32.net>
> > Cc: Arnd Bergmann <arnd@arndb.de>
> > Cc: Dominik Brodowski <linux@dominikbrodowski.net>
> > Cc: "Eric W. Biederman" <ebiederm@xmission.com>
> > Cc: Andrew Morton <akpm@linux-foundation.org>
> > Cc: Al Viro <viro@zeniv.linux.org.uk>
> > Cc: Oleg Nesterov <oleg@redhat.com>
> > Reviewed-by: Dave Martin <Dave.Martin@arm.com>
> > Reported-by: Steve McIntyre <steve.mcintyre@arm.com>
> > Tested-by: Steve McIntyre <93sam@debian.org>
> > Signed-off-by: Will Deacon <will.deacon@arm.com>
> > Signed-off-by: Catalin Marinas <catalin.marinas@arm.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