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authorEric W. Biederman <ebiederm@xmission.com>2013-01-31 07:21:14 +0400
committerEric W. Biederman <ebiederm@xmission.com>2013-02-13 18:00:53 +0400
commitd83f5901bc0cd7131a3b8534169ee889efc4c257 (patch)
treeec47947fcec33d9d373367d86b787b08be997168 /fs/coda/upcall.c
parent9fd973e085f7759f710603422b2e11ad5f2e000d (diff)
downloadlinux-d83f5901bc0cd7131a3b8534169ee889efc4c257.tar.xz
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/upcall.c')
-rw-r--r--fs/coda/upcall.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/coda/upcall.c b/fs/coda/upcall.c
index 5c6d2cd6ee86..3a731976dc5e 100644
--- a/fs/coda/upcall.c
+++ b/fs/coda/upcall.c
@@ -52,7 +52,7 @@ static void *alloc_upcall(int opcode, int size)
inp->ih.opcode = opcode;
inp->ih.pid = task_pid_nr_ns(current, &init_pid_ns);
inp->ih.pgid = task_pgrp_nr_ns(current, &init_pid_ns);
- inp->ih.uid = current_fsuid();
+ inp->ih.uid = from_kuid(&init_user_ns, current_fsuid());
return (void*)inp;
}
@@ -157,7 +157,7 @@ int venus_lookup(struct super_block *sb, struct CodaFid *fid,
}
int venus_close(struct super_block *sb, struct CodaFid *fid, int flags,
- vuid_t uid)
+ kuid_t uid)
{
union inputArgs *inp;
union outputArgs *outp;
@@ -166,7 +166,7 @@ int venus_close(struct super_block *sb, struct CodaFid *fid, int flags,
insize = SIZE(release);
UPARG(CODA_CLOSE);
- inp->ih.uid = uid;
+ inp->ih.uid = from_kuid(&init_user_ns, uid);
inp->coda_close.VFid = *fid;
inp->coda_close.flags = flags;