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| author | Eric Paris <eparis@redhat.com> | 2010-12-02 22:13:40 +0100 |
|---|---|---|
| committer | Eric Paris <eparis@redhat.com> | 2010-12-02 22:14:51 +0100 |
| commit | 415103f9932d45f7927f4b17e3a9a13834cdb9a1 (patch) | |
| tree | 271746ba59ca5b19185574538b5af3e30178c04f /security | |
| parent | SELinux: merge policydb_index_classes and policydb_index_others (diff) | |
| download | linux-415103f9932d45f7927f4b17e3a9a13834cdb9a1.tar.xz linux-415103f9932d45f7927f4b17e3a9a13834cdb9a1.zip | |
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>
Diffstat (limited to 'security')
| -rw-r--r-- | security/selinux/hooks.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 65fa8bf596f5..cda18fd8ca0f 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); |