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authorFlorian Westphal <fw@strlen.de>2021-02-13 02:59:59 +0300
committerDavid S. Miller <davem@davemloft.net>2021-02-13 03:31:46 +0300
commit4d54cc32112d8d8b0667559c9309f1a6f764f70b (patch)
tree05ec63a09dc8ed396f0ff2694a4d25fd752beba5 /net/netlink
parent6c714f1b547feb0402520357c91024375a4236f7 (diff)
downloadlinux-4d54cc32112d8d8b0667559c9309f1a6f764f70b.tar.xz
mptcp: avoid lock_fast usage in accept path
Once event support is added this may need to allocate memory while msk lock is held with softirqs disabled. Not using lock_fast also allows to do the allocation with GFP_KERNEL. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netlink')
-rw-r--r--net/netlink/genetlink.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index c992424e4d63..2d6fdf40df66 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -1360,11 +1360,43 @@ static struct genl_family genl_ctrl __ro_after_init = {
.netnsok = true,
};
+static int genl_bind(struct net *net, int group)
+{
+ const struct genl_family *family;
+ unsigned int id;
+ int ret = 0;
+
+ genl_lock_all();
+
+ idr_for_each_entry(&genl_fam_idr, family, id) {
+ const struct genl_multicast_group *grp;
+ int i;
+
+ if (family->n_mcgrps == 0)
+ continue;
+
+ i = group - family->mcgrp_offset;
+ if (i < 0 || i >= family->n_mcgrps)
+ continue;
+
+ grp = &family->mcgrps[i];
+ if ((grp->flags & GENL_UNS_ADMIN_PERM) &&
+ !ns_capable(net->user_ns, CAP_NET_ADMIN))
+ ret = -EPERM;
+
+ break;
+ }
+
+ genl_unlock_all();
+ return ret;
+}
+
static int __net_init genl_pernet_init(struct net *net)
{
struct netlink_kernel_cfg cfg = {
.input = genl_rcv,
.flags = NL_CFG_F_NONROOT_RECV,
+ .bind = genl_bind,
};
/* we'll bump the group number right afterwards */