diff options
| author | Ralf Baechle <ralf@linux-mips.org> | 2005-08-23 10:11:45 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2005-08-23 10:11:45 -0700 |
| commit | 01d7dd0e9f8c5f1888619d2649c7da389232b408 (patch) | |
| tree | ee4f22a33557bae4883eb2f4fb1359e97ac74186 /net/rose | |
| parent | 53b924b31fa53ac3007df3fef6870d5074a9adf8 (diff) | |
| download | linux-01d7dd0e9f8c5f1888619d2649c7da389232b408.tar.gz linux-01d7dd0e9f8c5f1888619d2649c7da389232b408.tar.bz2 linux-01d7dd0e9f8c5f1888619d2649c7da389232b408.zip | |
[AX25]: UID fixes
o Brown paperbag bug - ax25_findbyuid() was always returning a NULL pointer
as the result. Breaks ROSE completly and AX.25 if UID policy set to deny.
o While the list structure of AX.25's UID to callsign mapping table was
properly protected by a spinlock, it's elements were not refcounted
resulting in a race between removal and usage of an element.
Signed-off-by: Ralf Baechle DL5RB <ralf@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rose')
| -rw-r--r-- | net/rose/af_rose.c | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/net/rose/af_rose.c b/net/rose/af_rose.c index 3fe7e562125a..5480caf8ccc2 100644 --- a/net/rose/af_rose.c +++ b/net/rose/af_rose.c @@ -626,7 +626,8 @@ static int rose_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) struct rose_sock *rose = rose_sk(sk); struct sockaddr_rose *addr = (struct sockaddr_rose *)uaddr; struct net_device *dev; - ax25_address *user, *source; + ax25_address *source; + ax25_uid_assoc *user; int n; if (!sock_flag(sk, SOCK_ZAPPED)) @@ -651,14 +652,17 @@ static int rose_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) source = &addr->srose_call; - if ((user = ax25_findbyuid(current->euid)) == NULL) { + user = ax25_findbyuid(current->euid); + if (user) { + rose->source_call = user->call; + ax25_uid_put(user); + } else { if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) return -EACCES; - user = source; + rose->source_call = *source; } rose->source_addr = addr->srose_addr; - rose->source_call = *user; rose->device = dev; rose->source_ndigis = addr->srose_ndigis; @@ -685,8 +689,8 @@ static int rose_connect(struct socket *sock, struct sockaddr *uaddr, int addr_le struct rose_sock *rose = rose_sk(sk); struct sockaddr_rose *addr = (struct sockaddr_rose *)uaddr; unsigned char cause, diagnostic; - ax25_address *user; struct net_device *dev; + ax25_uid_assoc *user; int n; if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { @@ -736,12 +740,14 @@ static int rose_connect(struct socket *sock, struct sockaddr *uaddr, int addr_le if ((dev = rose_dev_first()) == NULL) return -ENETUNREACH; - if ((user = ax25_findbyuid(current->euid)) == NULL) + user = ax25_findbyuid(current->euid); + if (!user) return -EINVAL; memcpy(&rose->source_addr, dev->dev_addr, ROSE_ADDR_LEN); - rose->source_call = *user; + rose->source_call = user->call; rose->device = dev; + ax25_uid_put(user); rose_insert_socket(sk); /* Finish the bind */ } |