From 2bc6b218717b9d08f466f88209251d54bc09b207 Mon Sep 17 00:00:00 2001 From: Fuad Tabba Date: Tue, 22 Sep 2026 19:14:30 +0100 Subject: arm64/boot: Disable trapping of PMZR_EL0 writes to EL2 __init_el2_fgt2() writes one mask to both HDFGRTR2_EL2 and HDFGWTR2_EL2. PMZR_EL0 is write-only, so its trap bit, nPMZR_EL0, exists only in HDFGWTR2_EL2 and is therefore never set: a PMZR_EL0 write from the host traps to EL2, where the nVHE hypervisor has no handler and BUG()s. The kernel never writes PMZR_EL0, but kernel.perf_user_access=1 has the PMU driver set PMUSERENR_EL0.UEN for a task with a user-read event, so a write from EL0 reaches the trap and takes the host down without a panic message. Accumulate the HDFGWTR2_EL2 bits separately, as __init_el2_fgt() already does for HDFGWTR_EL2, and set nPMZR_EL0 with the other FEAT_PMUv3p9 bits. Fixes: 858c7bfcb35e1 ("arm64/boot: Enable EL2 requirements for FEAT_PMUv3p9") Cc: stable@vger.kernel.org Signed-off-by: Fuad Tabba Reviewed-by: Anshuman Khandual Reviewed-by: Oliver Upton Signed-off-by: Will Deacon --- include/net/inet6_hashtables.h | 191 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 191 insertions(+) create mode 100644 include/net/inet6_hashtables.h (limited to 'include/net/inet6_hashtables.h') diff --git a/include/net/inet6_hashtables.h b/include/net/inet6_hashtables.h new file mode 100644 index 000000000..2cc5d416b --- /dev/null +++ b/include/net/inet6_hashtables.h @@ -0,0 +1,191 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * INET An implementation of the TCP/IP protocol suite for the LINUX + * operating system. INET is implemented using the BSD Socket + * interface as the means of communication with the user level. + * + * Authors: Lotsa people, from code originally in tcp + */ + +#ifndef _INET6_HASHTABLES_H +#define _INET6_HASHTABLES_H + + +#if IS_ENABLED(CONFIG_IPV6) +#include +#include +#include +#include + +#include + +#include +#include + +struct inet_hashinfo; + +void inet6_init_ehash_secret(void); + +static inline unsigned int __inet6_ehashfn(const u32 lhash, + const u16 lport, + const u32 fhash, + const __be16 fport, + const u32 initval) +{ + const u32 ports = (((u32)lport) << 16) | (__force u32)fport; + return jhash_3words(lhash, fhash, ports, initval); +} + +/* + * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so + * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM + * + * The sockhash lock must be held as a reader here. + */ +struct sock *__inet6_lookup_established(const struct net *net, + const struct in6_addr *saddr, + const __be16 sport, + const struct in6_addr *daddr, + const u16 hnum, const int dif, + const int sdif); + +typedef u32 (inet6_ehashfn_t)(const struct net *net, + const struct in6_addr *laddr, const u16 lport, + const struct in6_addr *faddr, const __be16 fport); + +inet6_ehashfn_t inet6_ehashfn; + +INDIRECT_CALLABLE_DECLARE(inet6_ehashfn_t udp6_ehashfn); + +struct sock *inet6_lookup_reuseport(const struct net *net, struct sock *sk, + struct sk_buff *skb, int doff, + const struct in6_addr *saddr, + __be16 sport, + const struct in6_addr *daddr, + unsigned short hnum, + inet6_ehashfn_t *ehashfn); + +struct sock *inet6_lookup_listener(const struct net *net, + struct sk_buff *skb, int doff, + const struct in6_addr *saddr, + const __be16 sport, + const struct in6_addr *daddr, + const unsigned short hnum, + const int dif, const int sdif); + +struct sock *inet6_lookup_run_sk_lookup(const struct net *net, + int protocol, + struct sk_buff *skb, int doff, + const struct in6_addr *saddr, + const __be16 sport, + const struct in6_addr *daddr, + const u16 hnum, const int dif, + inet6_ehashfn_t *ehashfn); + +static inline struct sock *__inet6_lookup(const struct net *net, + struct sk_buff *skb, int doff, + const struct in6_addr *saddr, + const __be16 sport, + const struct in6_addr *daddr, + const u16 hnum, + const int dif, const int sdif, + bool *refcounted) +{ + struct sock *sk = __inet6_lookup_established(net, saddr, sport, + daddr, hnum, + dif, sdif); + *refcounted = true; + if (sk) + return sk; + *refcounted = false; + return inet6_lookup_listener(net, skb, doff, saddr, sport, + daddr, hnum, dif, sdif); +} + +static inline +struct sock *inet6_steal_sock(struct net *net, struct sk_buff *skb, int doff, + const struct in6_addr *saddr, const __be16 sport, + const struct in6_addr *daddr, const __be16 dport, + bool *refcounted, inet6_ehashfn_t *ehashfn) +{ + struct sock *sk, *reuse_sk; + bool prefetched; + + sk = skb_steal_sock(skb, refcounted, &prefetched); + if (!sk) + return NULL; + + if (!prefetched || !sk_fullsock(sk)) + return sk; + + if (sk->sk_protocol == IPPROTO_TCP) { + if (sk->sk_state != TCP_LISTEN) + return sk; + } else if (sk->sk_protocol == IPPROTO_UDP) { + if (sk->sk_state != TCP_CLOSE) + return sk; + } else { + return sk; + } + + reuse_sk = inet6_lookup_reuseport(net, sk, skb, doff, + saddr, sport, daddr, ntohs(dport), + ehashfn); + if (!reuse_sk) + return sk; + + /* We've chosen a new reuseport sock which is never refcounted. This + * implies that sk also isn't refcounted. + */ + WARN_ON_ONCE(*refcounted); + + return reuse_sk; +} + +static inline struct sock *__inet6_lookup_skb(struct sk_buff *skb, int doff, + const __be16 sport, + const __be16 dport, + int iif, int sdif, + bool *refcounted) +{ + struct net *net = skb_dst_dev_net_rcu(skb); + const struct ipv6hdr *ip6h = ipv6_hdr(skb); + struct sock *sk; + + sk = inet6_steal_sock(net, skb, doff, &ip6h->saddr, sport, &ip6h->daddr, dport, + refcounted, inet6_ehashfn); + if (IS_ERR(sk)) + return NULL; + if (sk) + return sk; + + return __inet6_lookup(net, skb, doff, &ip6h->saddr, sport, + &ip6h->daddr, ntohs(dport), + iif, sdif, refcounted); +} + +struct sock *inet6_lookup(const struct net *net, struct sk_buff *skb, int doff, + const struct in6_addr *saddr, const __be16 sport, + const struct in6_addr *daddr, const __be16 dport, + const int dif); + +static inline bool inet6_match(const struct net *net, const struct sock *sk, + const struct in6_addr *saddr, + const struct in6_addr *daddr, + const __portpair ports, + const int dif, const int sdif) +{ + if (!net_eq(sock_net(sk), net) || + sk->sk_family != AF_INET6 || + READ_ONCE(sk->sk_portpair) != ports || + !ipv6_addr_equal(&sk->sk_v6_daddr, saddr) || + !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) + return false; + + /* READ_ONCE() paired with WRITE_ONCE() in sock_bindtoindex_locked() */ + return inet_sk_bound_dev_eq(net, READ_ONCE(sk->sk_bound_dev_if), dif, + sdif); +} +#endif /* IS_ENABLED(CONFIG_IPV6) */ + +#endif /* _INET6_HASHTABLES_H */ -- cgit v1.3.1