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Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

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Conflicting commits, all resolutions pretty trivial:

drivers/bus/mhi/pci_generic.c
  5c2c853159 ("bus: mhi: pci-generic: configurable network interface MRU")
  56f6f4c4eb ("bus: mhi: pci_generic: Apply no-op for wake using sideband wake boolean")

drivers/nfc/s3fwrn5/firmware.c
  a0302ff590 ("nfc: s3fwrn5: remove unnecessary label")
  46573e3ab0 ("nfc: s3fwrn5: fix undefined parameter values in dev_err()")
  801e541c79 ("nfc: s3fwrn5: fix undefined parameter values in dev_err()")

MAINTAINERS
  7d901a1e87 ("net: phy: add Maxlinear GPY115/21x/24x driver")
  8a7b46fa79 ("MAINTAINERS: add Yasushi SHOJI as reviewer for the Microchip CAN BUS Analyzer Tool driver")

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2021-07-31 09:14:46 -07:00
commit d2e11fd2b7
426 changed files with 4470 additions and 2569 deletions
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51
net/unix/af_unix.c
View file

@ -1543,6 +1543,53 @@ out:
return err;
}
static void unix_peek_fds(struct scm_cookie *scm, struct sk_buff *skb)
{
scm->fp = scm_fp_dup(UNIXCB(skb).fp);
/*
* Garbage collection of unix sockets starts by selecting a set of
* candidate sockets which have reference only from being in flight
* (total_refs == inflight_refs). This condition is checked once during
* the candidate collection phase, and candidates are marked as such, so
* that non-candidates can later be ignored. While inflight_refs is
* protected by unix_gc_lock, total_refs (file count) is not, hence this
* is an instantaneous decision.
*
* Once a candidate, however, the socket must not be reinstalled into a
* file descriptor while the garbage collection is in progress.
*
* If the above conditions are met, then the directed graph of
* candidates (*) does not change while unix_gc_lock is held.
*
* Any operations that changes the file count through file descriptors
* (dup, close, sendmsg) does not change the graph since candidates are
* not installed in fds.
*
* Dequeing a candidate via recvmsg would install it into an fd, but
* that takes unix_gc_lock to decrement the inflight count, so it's
* serialized with garbage collection.
*
* MSG_PEEK is special in that it does not change the inflight count,
* yet does install the socket into an fd. The following lock/unlock
* pair is to ensure serialization with garbage collection. It must be
* done between incrementing the file count and installing the file into
* an fd.
*
* If garbage collection starts after the barrier provided by the
* lock/unlock, then it will see the elevated refcount and not mark this
* as a candidate. If a garbage collection is already in progress
* before the file count was incremented, then the lock/unlock pair will
* ensure that garbage collection is finished before progressing to
* installing the fd.
*
* (*) A -> B where B is on the queue of A or B is on the queue of C
* which is on the queue of listening socket A.
*/
spin_lock(&unix_gc_lock);
spin_unlock(&unix_gc_lock);
}
static int unix_scm_to_skb(struct scm_cookie *scm, struct sk_buff *skb, bool send_fds)
{
int err = 0;
@ -2192,7 +2239,7 @@ int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
sk_peek_offset_fwd(sk, size);
if (UNIXCB(skb).fp)
scm.fp = scm_fp_dup(UNIXCB(skb).fp);
unix_peek_fds(&scm, skb);
}
err = (flags & MSG_TRUNC) ? skb->len - skip : size;
@ -2482,7 +2529,7 @@ unlock:
/* It is questionable, see note in unix_dgram_recvmsg.
*/
if (UNIXCB(skb).fp)
scm.fp = scm_fp_dup(UNIXCB(skb).fp);
unix_peek_fds(&scm, skb);
sk_peek_offset_fwd(sk, chunk);