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authorDavid Herrmann <dh.herrmann@gmail.com>2017-07-17 11:35:54 +0200
committerDavid S. Miller <davem@davemloft.net>2017-07-17 08:57:59 -0700
commit27eac47b00789522ba00501b0838026e1ecb6f05 (patch)
tree8346a2f39052b1b3d3d06179dfe091555ddffe61 /net/unix/af_unix.c
parent3ccc6c6faaa93da70989177b91c7c3ef0df10937 (diff)
net/unix: drop obsolete fd-recursion limits
All unix sockets now account inflight FDs to the respective sender. This was introduced in: commit 712f4aad406bb1ed67f3f98d04c044191f0ff593 Author: willy tarreau <w@1wt.eu> Date: Sun Jan 10 07:54:56 2016 +0100 unix: properly account for FDs passed over unix sockets and further refined in: commit 415e3d3e90ce9e18727e8843ae343eda5a58fad6 Author: Hannes Frederic Sowa <hannes@stressinduktion.org> Date: Wed Feb 3 02:11:03 2016 +0100 unix: correctly track in-flight fds in sending process user_struct Hence, regardless of the stacking depth of FDs, the total number of inflight FDs is limited, and accounted. There is no known way for a local user to exceed those limits or exploit the accounting. Furthermore, the GC logic is independent of the recursion/stacking depth as well. It solely depends on the total number of inflight FDs, regardless of their layout. Lastly, the current `recursion_level' suffers a TOCTOU race, since it checks and inherits depths only at queue time. If we consider `A<-B' to mean `queue-B-on-A', the following sequence circumvents the recursion level easily: A<-B B<-C C<-D ... Y<-Z resulting in: A<-B<-C<-...<-Z With all of this in mind, lets drop the recursion limit. It has no additional security value, anymore. On the contrary, it randomly confuses message brokers that try to forward file-descriptors, since any sendmsg(2) call can fail spuriously with ETOOMANYREFS if a client maliciously modifies the FD while inflight. Cc: Alban Crequy <alban.crequy@collabora.co.uk> Cc: Simon McVittie <simon.mcvittie@collabora.co.uk> Signed-off-by: David Herrmann <dh.herrmann@gmail.com> Reviewed-by: Tom Gundersen <teg@jklm.no> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/unix/af_unix.c')
-rw-r--r--net/unix/af_unix.c24
1 files changed, 1 insertions, 23 deletions
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 7b52a380d710..5c53f22d62e8 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -1528,26 +1528,13 @@ static inline bool too_many_unix_fds(struct task_struct *p)
return false;
}
-#define MAX_RECURSION_LEVEL 4
-
static int unix_attach_fds(struct scm_cookie *scm, struct sk_buff *skb)
{
int i;
- unsigned char max_level = 0;
if (too_many_unix_fds(current))
return -ETOOMANYREFS;
- for (i = scm->fp->count - 1; i >= 0; i--) {
- struct sock *sk = unix_get_socket(scm->fp->fp[i]);
-
- if (sk)
- max_level = max(max_level,
- unix_sk(sk)->recursion_level);
- }
- if (unlikely(max_level > MAX_RECURSION_LEVEL))
- return -ETOOMANYREFS;
-
/*
* Need to duplicate file references for the sake of garbage
* collection. Otherwise a socket in the fps might become a
@@ -1559,7 +1546,7 @@ static int unix_attach_fds(struct scm_cookie *scm, struct sk_buff *skb)
for (i = scm->fp->count - 1; i >= 0; i--)
unix_inflight(scm->fp->user, scm->fp->fp[i]);
- return max_level;
+ return 0;
}
static int unix_scm_to_skb(struct scm_cookie *scm, struct sk_buff *skb, bool send_fds)
@@ -1649,7 +1636,6 @@ static int unix_dgram_sendmsg(struct socket *sock, struct msghdr *msg,
struct sk_buff *skb;
long timeo;
struct scm_cookie scm;
- int max_level;
int data_len = 0;
int sk_locked;
@@ -1701,7 +1687,6 @@ static int unix_dgram_sendmsg(struct socket *sock, struct msghdr *msg,
err = unix_scm_to_skb(&scm, skb, true);
if (err < 0)
goto out_free;
- max_level = err + 1;
skb_put(skb, len - data_len);
skb->data_len = data_len;
@@ -1819,8 +1804,6 @@ restart_locked:
__net_timestamp(skb);
maybe_add_creds(skb, sock, other);
skb_queue_tail(&other->sk_receive_queue, skb);
- if (max_level > unix_sk(other)->recursion_level)
- unix_sk(other)->recursion_level = max_level;
unix_state_unlock(other);
other->sk_data_ready(other);
sock_put(other);
@@ -1855,7 +1838,6 @@ static int unix_stream_sendmsg(struct socket *sock, struct msghdr *msg,
int sent = 0;
struct scm_cookie scm;
bool fds_sent = false;
- int max_level;
int data_len;
wait_for_unix_gc();
@@ -1905,7 +1887,6 @@ static int unix_stream_sendmsg(struct socket *sock, struct msghdr *msg,
kfree_skb(skb);
goto out_err;
}
- max_level = err + 1;
fds_sent = true;
skb_put(skb, size - data_len);
@@ -1925,8 +1906,6 @@ static int unix_stream_sendmsg(struct socket *sock, struct msghdr *msg,
maybe_add_creds(skb, sock, other);
skb_queue_tail(&other->sk_receive_queue, skb);
- if (max_level > unix_sk(other)->recursion_level)
- unix_sk(other)->recursion_level = max_level;
unix_state_unlock(other);
other->sk_data_ready(other);
sent += size;
@@ -2324,7 +2303,6 @@ redo:
last_len = last ? last->len : 0;
again:
if (skb == NULL) {
- unix_sk(sk)->recursion_level = 0;
if (copied >= target)
goto unlock;