From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- net/ipv6/ipcomp6.c | 224 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 224 insertions(+) create mode 100644 net/ipv6/ipcomp6.c (limited to 'net/ipv6/ipcomp6.c') diff --git a/net/ipv6/ipcomp6.c b/net/ipv6/ipcomp6.c new file mode 100644 index 000000000..b340d67eb --- /dev/null +++ b/net/ipv6/ipcomp6.c @@ -0,0 +1,224 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173 + * + * Copyright (C)2003 USAGI/WIDE Project + * + * Author Mitsuru KANDA + */ +/* + * [Memo] + * + * Outbound: + * The compression of IP datagram MUST be done before AH/ESP processing, + * fragmentation, and the addition of Hop-by-Hop/Routing header. + * + * Inbound: + * The decompression of IP datagram MUST be done after the reassembly, + * AH/ESP processing. + */ + +#define pr_fmt(fmt) "IPv6: " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static int ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, + u8 type, u8 code, int offset, __be32 info) +{ + struct net *net = dev_net(skb->dev); + __be32 spi; + const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; + struct ip_comp_hdr *ipcomph = + (struct ip_comp_hdr *)(skb->data + offset); + struct xfrm_state *x; + + if (type != ICMPV6_PKT_TOOBIG && + type != NDISC_REDIRECT) + return 0; + + spi = htonl(ntohs(ipcomph->cpi)); + x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, + spi, IPPROTO_COMP, AF_INET6); + if (!x) + return 0; + + if (type == NDISC_REDIRECT) + ip6_redirect(skb, net, skb->dev->ifindex, 0, + sock_net_uid(net, NULL)); + else + ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); + xfrm_state_put(x); + + return 0; +} + +static struct lock_class_key xfrm_state_lock_key; +static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x) +{ + struct net *net = xs_net(x); + struct xfrm_state *t = NULL; + + t = xfrm_state_alloc(net); + if (!t) + goto out; + lockdep_set_class(&t->lock, &xfrm_state_lock_key); + + t->id.proto = IPPROTO_IPV6; + t->id.spi = xfrm6_tunnel_alloc_spi(net, (xfrm_address_t *)&x->props.saddr); + if (!t->id.spi) + goto error; + + memcpy(t->id.daddr.a6, x->id.daddr.a6, sizeof(struct in6_addr)); + memcpy(&t->sel, &x->sel, sizeof(t->sel)); + t->props.family = AF_INET6; + t->props.mode = x->props.mode; + memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr)); + memcpy(&t->mark, &x->mark, sizeof(t->mark)); + t->if_id = x->if_id; + + if (xfrm_init_state(t, NULL)) + goto error; + + atomic_set(&t->tunnel_users, 1); + +out: + return t; + +error: + t->km.state = XFRM_STATE_DEAD; + xfrm_state_put(t); + t = NULL; + goto out; +} + +static int ipcomp6_tunnel_attach(struct xfrm_state *x) +{ + struct net *net = xs_net(x); + int err = 0; + struct xfrm_state *t = NULL; + __be32 spi; + u32 mark = x->mark.m & x->mark.v; + + spi = xfrm6_tunnel_spi_lookup(net, (xfrm_address_t *)&x->props.saddr); + if (spi) + t = xfrm_state_lookup(net, mark, (xfrm_address_t *)&x->id.daddr, + spi, IPPROTO_IPV6, AF_INET6); + if (!t) { + t = ipcomp6_tunnel_create(x); + if (!t) { + err = -EINVAL; + goto out; + } + xfrm_state_insert(t); + xfrm_state_hold(t); + } + x->tunnel = t; + atomic_inc(&t->tunnel_users); + +out: + return err; +} + +static int ipcomp6_init_state(struct xfrm_state *x, + struct netlink_ext_ack *extack) +{ + int err = -EINVAL; + + x->props.header_len = 0; + switch (x->props.mode) { + case XFRM_MODE_TRANSPORT: + break; + case XFRM_MODE_TUNNEL: + x->props.header_len += sizeof(struct ipv6hdr); + break; + default: + NL_SET_ERR_MSG(extack, "Unsupported XFRM mode for IPcomp"); + goto out; + } + + err = ipcomp_init_state(x, extack); + if (err) + goto out; + + if (x->props.mode == XFRM_MODE_TUNNEL) { + err = ipcomp6_tunnel_attach(x); + if (err) { + NL_SET_ERR_MSG(extack, "Kernel error: failed to initialize the associated state"); + goto out; + } + } + + err = 0; +out: + return err; +} + +static int ipcomp6_rcv_cb(struct sk_buff *skb, int err) +{ + return 0; +} + +static const struct xfrm_type ipcomp6_type = { + .owner = THIS_MODULE, + .proto = IPPROTO_COMP, + .init_state = ipcomp6_init_state, + .destructor = ipcomp_destroy, + .input = ipcomp_input, + .output = ipcomp_output, +}; + +static struct xfrm6_protocol ipcomp6_protocol = { + .handler = xfrm6_rcv, + .input_handler = xfrm_input, + .cb_handler = ipcomp6_rcv_cb, + .err_handler = ipcomp6_err, + .priority = 0, +}; + +static int __init ipcomp6_init(void) +{ + if (xfrm_register_type(&ipcomp6_type, AF_INET6) < 0) { + pr_info("%s: can't add xfrm type\n", __func__); + return -EAGAIN; + } + if (xfrm6_protocol_register(&ipcomp6_protocol, IPPROTO_COMP) < 0) { + pr_info("%s: can't add protocol\n", __func__); + xfrm_unregister_type(&ipcomp6_type, AF_INET6); + return -EAGAIN; + } + return 0; +} + +static void __exit ipcomp6_fini(void) +{ + if (xfrm6_protocol_deregister(&ipcomp6_protocol, IPPROTO_COMP) < 0) + pr_info("%s: can't remove protocol\n", __func__); + xfrm_unregister_type(&ipcomp6_type, AF_INET6); +} + +module_init(ipcomp6_init); +module_exit(ipcomp6_fini); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173"); +MODULE_AUTHOR("Mitsuru KANDA "); + +MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_COMP); 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