[PATCH 3/5] sysctl: Fix the selinux_sysctl_get_sid

[ebiederm@xmission.com (Eric W. Biederman)]

I goofed and when reenabling the fine grained selinux labels for
sysctls and forgot to add the "/sys" prefix before consulting
the policy database.  When computing the same path using
proc_dir_entries we got the "/sys" for free as it was part
of the tree, but it isn't true for clt_table trees.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
---
 security/selinux/hooks.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 47fb937..de16b9f 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1445,6 +1445,12 @@ static int selinux_sysctl_get_sid(ctl_table *table, u16 tclass, u32 *sid)
 		path = end;
 		table = table->parent;
 	}
+	buflen -= 4;
+	if (buflen < 0)
+		goto out_free;
+	end -= 4;
+	memcpy(end, "/sys", 4);
+	path = end;
 	rc = security_genfs_sid("proc", path, tclass, sid);
 out_free:
 	free_page((unsigned long)buffer);
-- 
1.4.4.1.g278f

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