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From: ebiederm@xmission.com (Eric W. Biederman)
To: Stephen Smalley <sds@tycho.nsa.gov>
Cc: Andrew Morton <akpm@osdl.org>, Ingo Molnar <mingo@elte.hu>,
tglx@linutronix.de, linux-kernel@vger.kernel.org,
selinux@tycho.nsa.gov, jmorris@namei.org
Subject: Re: [PATCH 2/2] sysctl: Restore the selinux path based label lookup for sysctls.
Date: Wed, 07 Feb 2007 18:57:34 -0700 [thread overview]
Message-ID: <m17iutmmwh.fsf@ebiederm.dsl.xmission.com> (raw)
In-Reply-To: <1170882738.11912.144.camel@moss-spartans.epoch.ncsc.mil> (Stephen Smalley's message of "Wed, 07 Feb 2007 16:12:18 -0500")
Stephen Smalley <sds@tycho.nsa.gov> writes:
>
> One related but separate issue is that the /proc/sys inode labeling is
> also affected by the sysctl patch series. Those inodes used to be
> labeled by selinux_proc_get_sid (from selinux_d_instantiate), but that
> no longer works, so they now fall back to the superblock SID (generic
> proc label). That changes the inode permission checks on an attempt to
> access a /proc/sys node and will likely cause denials under current
> policy for confined domains since one wouldn't generally be writing to
> the generic proc label. If you always called sysctl_perm from the proc
> sysctl code, we could possibly dispense with inode permission checking
> on those inodes, e.g. marking them private.
Like this?
It seems a little weird but I'm happy with it if you are.
Eric
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index b9d59c0..7d6f7c7 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -47,6 +47,7 @@ static struct inode *proc_sys_make_inode(struct inode *dir, struct ctl_table *ta
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
inode->i_op = &proc_sys_inode_operations;
inode->i_fop = &proc_sys_file_operations;
+ inode->i_flags |= S_PRIVATE; /* tell selinux to ignore this inode */
proc_sys_refresh_inode(inode, table);
out:
return inode;
next prev parent reply other threads:[~2007-02-08 1:58 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200701280106.l0S16CG3019873@shell0.pdx.osdl.net>
[not found] ` <20070127172410.2b041952.akpm@osdl.org>
[not found] ` <1169972718.17469.164.camel@localhost.localdomain>
[not found] ` <20070128003549.2ca38dc8.akpm@osdl.org>
[not found] ` <20070128093358.GA2071@elte.hu>
[not found] ` <20070128095712.GA6485@elte.hu>
[not found] ` <20070128100627.GA8416@elte.hu>
[not found] ` <20070128104548.a835d859.akpm@osdl.org>
2007-01-28 19:21 ` [PATCH] sysctl selinux: Don't look at table->de Eric W. Biederman
2007-01-29 13:04 ` Stephen Smalley
2007-01-29 15:23 ` James Morris
2007-01-29 17:55 ` Eric W. Biederman
2007-01-29 19:26 ` Stephen Smalley
2007-01-29 17:43 ` Eric W. Biederman
2007-01-29 18:43 ` Stephen Smalley
2007-01-29 19:08 ` Casey Schaufler
2007-01-29 20:07 ` Stephen Smalley
2007-01-30 10:25 ` Christoph Hellwig
2007-01-30 17:19 ` Casey Schaufler
2007-01-29 19:16 ` Eric W. Biederman
2007-01-29 23:28 ` Russell Coker
2007-02-06 21:16 ` [PATCH 1/2] sysctl: Add a parent entry to ctl_table and set the parent entry Eric W. Biederman
2007-02-06 21:21 ` [PATCH 2/2] sysctl: Restore the selinux path based label lookup for sysctls Eric W. Biederman
2007-02-07 18:24 ` Stephen Smalley
2007-02-07 21:12 ` Stephen Smalley
2007-02-07 21:54 ` Stephen Smalley
2007-02-07 22:21 ` Eric W. Biederman
2007-02-08 15:07 ` Stephen Smalley
2007-02-08 1:57 ` Eric W. Biederman [this message]
2007-02-08 15:01 ` Stephen Smalley
2007-02-08 17:53 ` Eric W. Biederman
2007-02-08 18:13 ` Stephen Smalley
2007-02-08 22:17 ` Eric W. Biederman
2007-02-08 22:51 ` [PATCH 0/5] sysctl cleanup selinux fixes Eric W. Biederman
2007-02-08 22:53 ` [PATCH 1/5] sysctl: Remove declaration of nonexistent sysctl_init() Eric W. Biederman
2007-02-08 22:54 ` [PATCH 2/5] sysctl: Set the parent field in the root sysctl table Eric W. Biederman
2007-02-08 22:55 ` [PATCH 3/5] sysctl: Fix the selinux_sysctl_get_sid Eric W. Biederman
2007-02-08 23:02 ` [PATCH 4/5] selinux: Enhance selinux to always ignore private inodes Eric W. Biederman
2007-02-08 23:04 ` [PATCH 5/5] sysctl: Hide the sysctl proc inodes from selinux Eric W. Biederman
2007-02-09 12:26 ` [PATCH 4/5] selinux: Enhance selinux to always ignore private inodes Stephen Smalley
2007-02-09 12:24 ` [PATCH 3/5] sysctl: Fix the selinux_sysctl_get_sid Stephen Smalley
2007-02-09 11:05 ` [PATCH 0/5] sysctl cleanup selinux fixes Andrew Morton
2007-02-09 18:09 ` Eric W. Biederman
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