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authorEric W. Biederman <ebiederm@xmission.com>2013-01-30 19:21:14 -0800
committerEric W. Biederman <ebiederm@xmission.com>2013-02-13 06:00:53 -0800
commitd83f5901bc0cd7131a3b8534169ee889efc4c257 (patch)
treeec47947fcec33d9d373367d86b787b08be997168 /fs/coda/psdev.c
parent9fd973e085f7759f710603422b2e11ad5f2e000d (diff)
downloadlinux-d83f5901bc0cd7131a3b8534169ee889efc4c257.tar.bz2
coda: Restrict coda messages to the initial user namespace
Remove the slight chance that uids and gids in coda messages will be interpreted in the wrong user namespace. - Only allow processes in the initial user namespace to open the coda character device to communicate with coda filesystems. - Explicitly convert the uids in the coda header into the initial user namespace. - In coda_vattr_to_attr make kuids and kgids from the initial user namespace uids and gids in struct coda_vattr that just came from userspace. - In coda_iattr_to_vattr convert kuids and kgids into uids and gids in the intial user namespace and store them in struct coda_vattr for sending to coda userspace programs. Nothing needs to be changed with mounts as coda does not support being mounted in anything other than the initial user namespace. Cc: Jan Harkes <jaharkes@cs.cmu.edu> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'fs/coda/psdev.c')
-rw-r--r--fs/coda/psdev.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/coda/psdev.c b/fs/coda/psdev.c
index dd60f905d4fe..ebc2bae6c289 100644
--- a/fs/coda/psdev.c
+++ b/fs/coda/psdev.c
@@ -270,6 +270,9 @@ static int coda_psdev_open(struct inode * inode, struct file * file)
if (task_active_pid_ns(current) != &init_pid_ns)
return -EINVAL;
+ if (current_user_ns() != &init_user_ns)
+ return -EINVAL;
+
idx = iminor(inode);
if (idx < 0 || idx >= MAX_CODADEVS)
return -ENODEV;