Skip to content

Commit

Permalink
tun: revert fix group permission check
Browse files Browse the repository at this point in the history
This reverts commit 3ca459e.

The blamed commit caused a regression when neither tun->owner nor
tun->group is set. This is intended to be allowed, but now requires
CAP_NET_ADMIN.

Discussion in the referenced thread pointed out that the original
issue that prompted this patch can be resolved in userspace.

The relaxed access control may also make a device accessible when it
previously wasn't, while existing users may depend on it to not be.

This is a clean pure git revert, except for fixing the indentation on
the gid_valid line that checkpatch correctly flagged.

Fixes: 3ca459e ("tun: fix group permission check")
Link: https://lore.kernel.org/netdev/CAFqZXNtkCBT4f+PwyVRmQGoT3p1eVa01fCG_aNtpt6dakXncUg@mail.gmail.com/
Signed-off-by: Willem de Bruijn <willemb@google.com>
Cc: Ondrej Mosnacek <omosnace@redhat.com>
Cc: Stas Sergeev <stsp2@yandex.ru>
Link: https://patch.msgid.link/20250204161015.739430-1-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
  • Loading branch information
Willem de Bruijn authored and Jakub Kicinski committed Feb 6, 2025
1 parent 02b71dc commit a70c7b3
Showing 1 changed file with 5 additions and 9 deletions.
14 changes: 5 additions & 9 deletions drivers/net/tun.c
Original file line number Diff line number Diff line change
Expand Up @@ -574,18 +574,14 @@ static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb,
return ret;
}

static inline bool tun_capable(struct tun_struct *tun)
static inline bool tun_not_capable(struct tun_struct *tun)
{
const struct cred *cred = current_cred();
struct net *net = dev_net(tun->dev);

if (ns_capable(net->user_ns, CAP_NET_ADMIN))
return 1;
if (uid_valid(tun->owner) && uid_eq(cred->euid, tun->owner))
return 1;
if (gid_valid(tun->group) && in_egroup_p(tun->group))
return 1;
return 0;
return ((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) ||
(gid_valid(tun->group) && !in_egroup_p(tun->group))) &&
!ns_capable(net->user_ns, CAP_NET_ADMIN);
}

static void tun_set_real_num_queues(struct tun_struct *tun)
Expand Down Expand Up @@ -2782,7 +2778,7 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
!!(tun->flags & IFF_MULTI_QUEUE))
return -EINVAL;

if (!tun_capable(tun))
if (tun_not_capable(tun))
return -EPERM;
err = security_tun_dev_open(tun->security);
if (err < 0)
Expand Down

0 comments on commit a70c7b3

Please sign in to comment.