linux-kernel - Re: [PATCH 4.19 087/361] signal: Introduce COMPAT_SIGMINSTKSZ for use in compat_sys

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Date:   Mon, 19 Nov 2018 16:15:51 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Steve McIntyre <93sam@...ian.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        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>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 4.19 087/361] signal: Introduce COMPAT_SIGMINSTKSZ for
 use in compat_sys_sigaltstack

On Mon, Nov 12, 2018 at 11:49:05AM +0000, Steve McIntyre wrote:
> On Sun, Nov 11, 2018 at 02:17:14PM -0800, Greg Kroah-Hartman wrote:
> >4.19-stable review patch.  If anyone has any objections, please let me know.
> >
> >------------------
> >
> >From: Will Deacon <will.deacon@....com>
> >
> >[ Upstream commit 22839869f21ab3850fbbac9b425ccc4c0023926f ]
> >
> >The sigaltstack(2) system call fails with -ENOMEM if the new alternative
> >signal stack is found to be smaller than SIGMINSTKSZ. On architectures
> >such as arm64, where the native value for SIGMINSTKSZ is larger than
> >the compat value, this can result in an unexpected error being reported
> >to a compat task. See, for example:
> >
> >  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=904385
> 
> ...
> 
> Thanks Greg! If it's not too much effort, could you also take this for
> 4.9-stable as well please? That would get it into our next Debian
> stable update too. :-)

Does not apply to 4.9.y, can you provide a working backport?

thanks,

greg k-h