linux-kernel - Re: BUG at security/selinux/avc.c:883 (was: Re: linux-next: Tree for July 17: early crash on x86-64)

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Date:	Tue, 29 Jul 2008 07:38:17 +1000 (EST)
From:	James Morris <jmorris@...ei.org>
To:	Stephen Smalley <sds@...ho.nsa.gov>
cc:	Al Viro <viro@...IV.linux.org.uk>, Thomas Meyer <thomas@...3r.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Alexander Beregalov <a.beregalov@...il.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Eric Paris <eparis@...isplace.org>,
	linux-security-module@...r.kernel.org
Subject: Re: BUG at security/selinux/avc.c:883 (was: Re: linux-next: Tree
 for July 17: early crash on x86-64)

On Mon, 28 Jul 2008, Stephen Smalley wrote:

> SELinux needs MAY_APPEND to be passed down to the security hook.
> Otherwise, we get permission denials when only append permission is
> granted by policy even if the opening process specified O_APPEND.
> Shows up as a regression in the ltp selinux testsuite, fixed by
> this patch.
> 
> Signed-off-by:  Stephen Smalley <sds@...ho.nsa.gov>

Applied to  
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6#hotfixes


Al, holler if you want to push this through your tree.


---

 fs/namei.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/namei.c b/fs/namei.c
index a7b0a0b..b91e973 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -274,7 +274,7 @@ int inode_permission(struct inode *inode, int mask)
                return retval;
 
        return security_inode_permission(inode,
-                       mask & (MAY_READ|MAY_WRITE|MAY_EXEC));
+                       mask & (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND));
 }
 
 /**



- James
-- 
James Morris
<jmorris@...ei.org>
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