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[PATCH] Fix security check for joint context= and fscontext= mount options 

After some discussion on the actual meaning of the filesystem class
security check in try context mount it was determined that the checks for
the context= mount options were not correct if fscontext mount option had
already been used.

When labeling the superblock we should be checking relabel_from and
relabel_to.  But if the superblock has already been labeled (with
fscontext) then context= is actually labeling the inodes, and so we should
be checking relabel_from and associate.  This patch fixes which checks are
called depending on the mount options.

Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Acked-by: James Morris <jmorris@namei.org>
Cc: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Eric Paris 2006-07-14 00:24:33 -07:00 committed by Linus Torvalds
parent 517e7aa5b0
commit b04ea3cebf
1 changed files with 9 additions and 5 deletions
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8
security/selinux/hooks.c
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@ -523,12 +523,16 @@ static int try_context_mount(struct super_block *sb, void *data)
goto out_free;
}
if (!fscontext) {
rc = may_context_mount_sb_relabel(sid, sbsec, tsec);
if (rc)
goto out_free;
if (!fscontext)
sbsec->sid = sid;
} else {
rc = may_context_mount_inode_relabel(sid, sbsec, tsec);
if (rc)
goto out_free;
}
sbsec->mntpoint_sid = sid;
sbsec->behavior = SECURITY_FS_USE_MNTPOINT;