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authorEric Paris <eparis@redhat.com>2010-12-02 16:13:40 -0500
committerEric Paris <eparis@redhat.com>2010-12-02 16:14:51 -0500
commit415103f9932d45f7927f4b17e3a9a13834cdb9a1 (patch)
tree271746ba59ca5b19185574538b5af3e30178c04f
parent1d9bc6dc5b6b9cc9299739f0245ce4841f066b92 (diff)
downloadlinux-linaro-415103f9932d45f7927f4b17e3a9a13834cdb9a1.tar.gz
SELinux: do not compute transition labels on mountpoint labeled filesystems
selinux_inode_init_security computes transitions sids even for filesystems that use mount point labeling. It shouldn't do that. It should just use the mount point label always and no matter what. This causes 2 problems. 1) it makes file creation slower than it needs to be since we calculate the transition sid and 2) it allows files to be created with a different label than the mount point! # id -Z staff_u:sysadm_r:sysadm_t:s0-s0:c0.c1023 # sesearch --type --class file --source sysadm_t --target tmp_t Found 1 semantic te rules: type_transition sysadm_t tmp_t : file user_tmp_t; # mount -o loop,context="system_u:object_r:tmp_t:s0" /tmp/fs /mnt/tmp # ls -lZ /mnt/tmp drwx------. root root system_u:object_r:tmp_t:s0 lost+found # touch /mnt/tmp/file1 # ls -lZ /mnt/tmp -rw-r--r--. root root staff_u:object_r:user_tmp_t:s0 file1 drwx------. root root system_u:object_r:tmp_t:s0 lost+found Whoops, we have a mount point labeled filesystem tmp_t with a user_tmp_t labeled file! Signed-off-by: Eric Paris <eparis@redhat.com> Reviewed-by: Reviewed-by: James Morris <jmorris@namei.org>
-rw-r--r--security/selinux/hooks.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 65fa8bf596f..cda18fd8ca0 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2525,7 +2525,10 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
sid = tsec->sid;
newsid = tsec->create_sid;
- if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) {
+ if ((sbsec->flags & SE_SBINITIALIZED) &&
+ (sbsec->behavior == SECURITY_FS_USE_MNTPOINT))
+ newsid = sbsec->mntpoint_sid;
+ else if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) {
rc = security_transition_sid(sid, dsec->sid,
inode_mode_to_security_class(inode->i_mode),
&newsid);