linux-kernel - Re: [PATCH v2] include/uapi/linux/xfrm.h: Fix XFRM_MSG

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Message-ID: <20210915085153.GB36125@gauss3.secunet.de>
Date:   Wed, 15 Sep 2021 10:51:53 +0200
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Eugene Syromiatnikov <esyr@...hat.com>
CC:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Antony Antony <antony.antony@...unet.com>,
        "Christian Langrock" <christian.langrock@...unet.com>,
        Nicolas Dichtel <nicolas.dichtel@...nd.com>,
        <selinux@...r.kernel.org>, Paul Moore <paul@...l-moore.com>,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        "Eric Paris" <eparis@...isplace.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, "Dmitry V. Levin" <ldv@...ace.io>,
        <linux-api@...r.kernel.org>
Subject: Re: [PATCH v2] include/uapi/linux/xfrm.h: Fix XFRM_MSG_MAPPING ABI
 breakage

On Sun, Sep 12, 2021 at 02:22:34PM +0200, Eugene Syromiatnikov wrote:
> Commit 2d151d39073a ("xfrm: Add possibility to set the default to block
> if we have no policy") broke ABI by changing the value of the XFRM_MSG_MAPPING
> enum item, thus also evading the build-time check
> in security/selinux/nlmsgtab.c:selinux_nlmsg_lookup for presence of proper
> security permission checks in nlmsg_xfrm_perms.  Fix it by placing
> XFRM_MSG_SETDEFAULT/XFRM_MSG_GETDEFAULT to the end of the enum, right before
> __XFRM_MSG_MAX, and updating the nlmsg_xfrm_perms accordingly.
> 
> Fixes: 2d151d39073a ("xfrm: Add possibility to set the default to block if we have no policy")
> References: https://lore.kernel.org/netdev/20210901151402.GA2557@altlinux.org/
> Signed-off-by: Eugene Syromiatnikov <esyr@...hat.com>

Applied, thanks a lot Eugene!