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* FAILED: patch "[PATCH] ipv6: flowlabel: cap duplicate leases per socket" failed to apply to 5.15-stable tree
@ 2026-09-16 15:59 gregkh
  2026-09-17  4:08 ` [PATCH 5.15.y 1/5] ipv4: remove fib_devindex_hashfn() Sasha Levin
  0 siblings, 1 reply; 6+ messages in thread
From: gregkh @ 2026-09-16 15:59 UTC (permalink / raw)
  To: zhilinz, edumazet, idosch, kuba, vega; +Cc: stable


The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 8d6cd188508513503805c156165de38e4e4a8615
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026091657-voter-although-5ad8@gregkh' --subject-prefix 'PATCH 5.15.y' 'HEAD^..'

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 8d6cd188508513503805c156165de38e4e4a8615 Mon Sep 17 00:00:00 2001
From: Zhiling Zou <zhilinz@nebusec.ai>
Date: Thu, 3 Sep 2026 14:23:03 +0800
Subject: [PATCH] ipv6: flowlabel: cap duplicate leases per socket

ipv6_flowlabel_get() allocates an ipv6_fl_socklist entry for every
successful GET. The recheck path for a compatible existing flowlabel
links another lease without applying any lease admission check. Repeated
GET requests for one shareable label can therefore grow a socket's lease
list without bound.

Reject a new unprivileged lease once the socket already holds
FL_MAX_PER_SOCK leases. Check this on the shared recheck path so reuse
of a globally interned label, including the fl_intern() collision path,
is covered as well. New-label admission remains under the existing
mem_check() policy.

Use capable(CAP_NET_ADMIN) rather than ns_capable(), matching
mem_check(). An unprivileged user must not bypass the cap by creating a
user namespace and a netns where they have CAP_NET_ADMIN, which would
still consume host memory.

Check the capability only when the socket reaches the limit, so
successful unprivileged GET requests below the cap do not generate a
capability audit. Do the admission check before updating linger and
expires so a rejected GET does not refresh the shared label, matching
the existing socket-list allocation failure path.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Reported-by: Vega <vega@nebusec.ai>
Suggested-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Zhiling Zou <zhilinz@nebusec.ai>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/83f8535972ff6e3741548476a1d50dec24c758be.1788415194.git.zhilinz@nebusec.ai
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c
index 1ab5ad0dcf24..006585dc8b5c 100644
--- a/net/ipv6/ip6_flowlabel.c
+++ b/net/ipv6/ip6_flowlabel.c
@@ -461,6 +461,21 @@ fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq,
 	return NULL;
 }
 
+static bool fl_sock_at_lease_limit(const struct sock *sk)
+{
+	const struct ipv6_fl_socklist *sfl;
+	int count = 0;
+
+	rcu_read_lock();
+	for_each_sk_fl_rcu(sk, sfl) {
+		if (++count >= FL_MAX_PER_SOCK)
+			break;
+	}
+	rcu_read_unlock();
+
+	return count >= FL_MAX_PER_SOCK;
+}
+
 static int mem_check(struct sock *sk)
 {
 	const int unpriv_total_limit = FL_MAX_SIZE - (FL_MAX_SIZE / 4);
@@ -679,6 +694,10 @@ static int ipv6_flowlabel_get(struct sock *sk, struct in6_flowlabel_req *freq,
 			err = -ENOMEM;
 			if (!sfl1)
 				goto release;
+			err = -ENOBUFS;
+			if (fl_sock_at_lease_limit(sk) &&
+			    !capable(CAP_NET_ADMIN))
+				goto release;
 			if (fl->linger > fl1->linger)
 				fl1->linger = fl->linger;
 			if ((long)(fl->expires - fl1->expires) > 0)


^ permalink raw reply related	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2026-09-17  4:08 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-09-16 15:59 FAILED: patch "[PATCH] ipv6: flowlabel: cap duplicate leases per socket" failed to apply to 5.15-stable tree gregkh
2026-09-17  4:08 ` [PATCH 5.15.y 1/5] ipv4: remove fib_devindex_hashfn() Sasha Levin
2026-09-17  4:08   ` [PATCH 5.15.y 2/5] ipv4: use rcu in ip_fib_check_default() Sasha Levin
2026-09-17  4:08   ` [PATCH 5.15.y 3/5] ipv6: make ipv6_pinfo.saddr_cache a boolean Sasha Levin
2026-09-17  4:08   ` [PATCH 5.15.y 4/5] ipv6: Move ipv6_fl_list from ipv6_pinfo to inet_sock Sasha Levin
2026-09-17  4:08   ` [PATCH 5.15.y 5/5] ipv6: flowlabel: cap duplicate leases per socket Sasha Levin

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