linux-kernel - Re: [PATCH 1/2] security/selinux: fix /proc/sys/ labeling

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Message-ID: <AANLkTik+N5J-MDrbMbtwRPwz==J4y8sbBkhir=1K3g=B@mail.gmail.com>
Date:	Tue, 1 Feb 2011 21:46:42 +0200
From:	Lucian Adrian Grijincu <lucian.grijincu@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Stephen Smalley <sds@...ho.nsa.gov>,
	James Morris <jmorris@...ei.org>,
	Eric Paris <eparis@...isplace.org>,
	linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH 1/2] security/selinux: fix /proc/sys/ labeling

On Tue, Feb 1, 2011 at 9:33 PM, Eric W. Biederman <ebiederm@...ssion.com> wrote:
> What kernel has a dentry_path_raw?  Perhaps you mean __dentry_path?


See the function here:
https://github.com/mirrors/linux-2.6/blob/70d1f365568e0cdbc9f4ab92428e1830fdb09ab0/fs/dcache.c

The last patches were against 2.6.38-rc2 because the dcache layer got
rewritten in 2.6.38 http://lwn.net/Articles/421784/

__dentry_path is now static (in fs/dcache.c) and does not take the
necessary locks.

dentry_path_raw is __dentry_path with locks

    ec2447c278ee973d35f38e53ca16ba7f965ae33d
    hostfs: simplify locking

    Remove dcache_lock locking from hostfs filesystem, and move it into dcache
    helpers. All that is required is a coherent path name. Protection from
    concurrent modification of the namespace after path name generation is not
    provided in current code, because dcache_lock is dropped before the path is
    used.

    Signed-off-by: Nick Piggin <npiggin@...nel.dk>



-- 
 .
..: Lucian
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