linux-kernel - Re: [PATCH 1/4] Cache xattr security drop check for write

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Date:	Sun, 29 May 2011 13:48:26 -0400
From:	Valdis.Kletnieks@...edu
To:	Andi Kleen <ak@...ux.intel.com>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, viro@...iv.linux.org.uk,
	chris.mason@...cle.com, josef@...hat.com, agruen@...bit.com,
	"Serge E. Hallyn" <serue@...ibm.com>
Subject: Re: [PATCH 1/4] Cache xattr security drop check for write

On Sun, 29 May 2011 07:24:32 PDT, Andi Kleen said:

> These are not for selinux xattrs, but capability xattrs.

+#define S_NOSEC		4096	/* no suid or xattr security attributes */

Sorry for reading that wrong, since selinux stores stuff under security.* xattr
as well.

+	int issec = !strncmp(name, XATTR_SECURITY_PREFIX,
+				   XATTR_SECURITY_PREFIX_LEN);
 
is going to match *any* security.* attribute, including SELinux ones stored under
security.selinux.  If you wanted to be capability-specific, maybe youw anted these
two:

#define XATTR_CAPS_SUFFIX "capability"
#define XATTR_NAME_CAPS XATTR_SECURITY_PREFIX XATTR_CAPS_SUFFIX


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