linux-kernel - [PATCH 1/2] security/selinux: Simplify proc inode to security label mapping

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Date:	Mon, 31 Jan 2011 05:25:28 +0200
From:	Lucian Adrian Grijincu <lucian.grijincu@...il.com>
To:	Stephen Smalley <sds@...ho.nsa.gov>,
	James Morris <jmorris@...ei.org>,
	Eric Paris <eparis@...isplace.org>,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, selinux@...ho.nsa.gov,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Octavian Purdila <opurdila@...acom.com>
Subject: [PATCH 1/2] security/selinux: Simplify proc inode to security label mapping

Currently selinux has incestuous knowledge of the implementation details
of procfs and sysctl that it uses to get a pathname from an inode. As it
happens the point we care is in the security_d_instantiate lsm hook so
we have a valid dentry that we can use to get the entire pathname on
the proc filesystem.  With the recent change to sys_sysctl to go through
proc/sys all proc and sysctl accesses go through the vfs, which
means we no longer need a sysctl special case.

So get the path for the dentry, remove the incestuous knowledge
and simplify the code.

caveat: Because the dentry may not yet be hashed I think dentry_path will
        append (deleted) and thus is not the right function to call.

Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
Signed-off-by: Lucian Adrian Grijincu <lucian.grijincu@...il.com>
---
 security/selinux/hooks.c |  114 ++++-----------------------------------------
 1 files changed, 11 insertions(+), 103 deletions(-)

View attachment "0001-security-selinux-Simplify-proc-inode-to-security-lab.patch" of type "text/x-patch" (4612 bytes)