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

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Date:   Tue, 30 Jul 2019 11:37:13 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Will Deacon <will@...nel.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 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?

thanks,

greg k-h