From: James Morris <jmorris@namei.org>
Date: Tue, 15 Jul 2008 08:32:49 +0000 (+1000)
Subject: Revert "SELinux: allow fstype unknown to policy to use xattrs if present"
X-Git-Tag: v2.6.27-rc1~1089^2
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=089be43e403a78cd6889cde2fba164fefe9dfd89;p=linux-2.6

Revert "SELinux: allow fstype unknown to policy to use xattrs if present"

This reverts commit 811f3799279e567aa354c649ce22688d949ac7a9.

From Eric Paris:

"Please drop this patch for now.  It deadlocks on ntfs-3g.  I need to
rework it to handle fuse filesystems better.  (casey was right)"
---

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 91200feb3f..63f131fc42 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -555,15 +555,13 @@ static int selinux_set_mnt_opts(struct super_block *sb,
 	struct task_security_struct *tsec = current->security;
 	struct superblock_security_struct *sbsec = sb->s_security;
 	const char *name = sb->s_type->name;
-	struct dentry *root = sb->s_root;
-	struct inode *root_inode = root->d_inode;
-	struct inode_security_struct *root_isec = root_inode->i_security;
+	struct inode *inode = sbsec->sb->s_root->d_inode;
+	struct inode_security_struct *root_isec = inode->i_security;
 	u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0;
 	u32 defcontext_sid = 0;
 	char **mount_options = opts->mnt_opts;
 	int *flags = opts->mnt_opts_flags;
 	int num_opts = opts->num_mnt_opts;
-	bool can_xattr = false;
 
 	mutex_lock(&sbsec->lock);
 
@@ -667,24 +665,14 @@ static int selinux_set_mnt_opts(struct super_block *sb,
 		goto out;
 	}
 
-	if (strcmp(name, "proc") == 0)
+	if (strcmp(sb->s_type->name, "proc") == 0)
 		sbsec->proc = 1;
 
-	/*
-	 * test if the fs supports xattrs, fs_use might make use of this if the
-	 * fs has no definition in policy.
-	 */
-	if (root_inode->i_op->getxattr) {
-		rc = root_inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0);
-		if (rc >= 0 || rc == -ENODATA)
-			can_xattr = true;
-	}
-
 	/* Determine the labeling behavior to use for this filesystem type. */
-	rc = security_fs_use(name, &sbsec->behavior, &sbsec->sid, can_xattr);
+	rc = security_fs_use(sb->s_type->name, &sbsec->behavior, &sbsec->sid);
 	if (rc) {
 		printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n",
-		       __func__, name, rc);
+		       __func__, sb->s_type->name, rc);
 		goto out;
 	}
 
diff --git a/security/selinux/include/security.h b/security/selinux/include/security.h
index 44cba2e21d..7c543003d6 100644
--- a/security/selinux/include/security.h
+++ b/security/selinux/include/security.h
@@ -136,7 +136,7 @@ int security_get_allow_unknown(void);
 #define SECURITY_FS_USE_MNTPOINT	6 /* use mountpoint labeling */
 
 int security_fs_use(const char *fstype, unsigned int *behavior,
-	u32 *sid, bool can_xattr);
+	u32 *sid);
 
 int security_genfs_sid(const char *fstype, char *name, u16 sclass,
 	u32 *sid);
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index 8e42da1201..b52f923ce6 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -1934,8 +1934,7 @@ out:
 int security_fs_use(
 	const char *fstype,
 	unsigned int *behavior,
-	u32 *sid,
-	bool can_xattr)
+	u32 *sid)
 {
 	int rc = 0;
 	struct ocontext *c;
@@ -1949,7 +1948,6 @@ int security_fs_use(
 		c = c->next;
 	}
 
-	/* look for labeling behavior defined in policy */
 	if (c) {
 		*behavior = c->v.behavior;
 		if (!c->sid[0]) {
@@ -1960,23 +1958,14 @@ int security_fs_use(
 				goto out;
 		}
 		*sid = c->sid[0];
-		goto out;
-	}
-
-	/* labeling behavior not in policy, use xattrs if possible */
-	if (can_xattr) {
-		*behavior = SECURITY_FS_USE_XATTR;
-		*sid = SECINITSID_FS;
-		goto out;
-	}
-
-	/* no behavior in policy and can't use xattrs, try GENFS */
-	rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid);
-	if (rc) {
-		*behavior = SECURITY_FS_USE_NONE;
-		rc = 0;
 	} else {
-		*behavior = SECURITY_FS_USE_GENFS;
+		rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid);
+		if (rc) {
+			*behavior = SECURITY_FS_USE_NONE;
+			rc = 0;
+		} else {
+			*behavior = SECURITY_FS_USE_GENFS;
+		}
 	}
 
 out: