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

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Message-ID: <20181112114857.2aidwlw2podpzytb@tack.einval.com>
Date:   Mon, 12 Nov 2018 11:49:05 +0000
From:   Steve McIntyre <93sam@...ian.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.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 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. :-)

Thanks,

Steve

-- 
Steve McIntyre, Cambridge, UK.                                steve@...val.com
"I suspect most samba developers are already technically insane... Of
 course, since many of them are Australians, you can't tell." -- Linus Torvalds