commit: 4c4bbbce81aa627f494af184dd6edc3ed2cb4fd4 Author: Mike Pagano <mpagano <AT> gentoo <DOT> org> AuthorDate: Thu Feb 1 23:18:32 2024 +0000 Commit: Mike Pagano <mpagano <AT> gentoo <DOT> org> CommitDate: Thu Feb 1 23:18:32 2024 +0000 URL: https://gitweb.gentoo.org/proj/linux-patches.git/commit/?id=4c4bbbce
ipmr: fix kernel panic when forwarding mcast packets Bug: https://bugs.gentoo.org/923372 Signed-off-by: Mike Pagano <mpagano <AT> gentoo.org> 0000_README | 4 + ...-kern-panic-when-forwarding-mcast-packets.patch | 165 +++++++++++++++++++++ 2 files changed, 169 insertions(+) diff --git a/0000_README b/0000_README index f27cebb4..94c47ec5 100644 --- a/0000_README +++ b/0000_README @@ -119,6 +119,10 @@ Patch: 2000_BT-Check-key-sizes-only-if-Secure-Simple-Pairing-enabled.patch From: https://lore.kernel.org/linux-bluetooth/[email protected]/raw Desc: Bluetooth: Check key sizes only when Secure Simple Pairing is enabled. See bug #686758 +Patch: 2010_ipmr-fix-kern-panic-when-forwarding-mcast-packets.patch +From: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git +Desc: ipmr: fix kernel panic when forwarding mcast packets + Patch: 2800_amdgpu-Adj-kmalloc-array-calls-for-new-Walloc-size.patch From: [email protected] Desc: amdgpu: Adjust kmalloc_array calls for new -Walloc-size diff --git a/2010_ipmr-fix-kern-panic-when-forwarding-mcast-packets.patch b/2010_ipmr-fix-kern-panic-when-forwarding-mcast-packets.patch new file mode 100644 index 00000000..b8b48252 --- /dev/null +++ b/2010_ipmr-fix-kern-panic-when-forwarding-mcast-packets.patch @@ -0,0 +1,165 @@ +From e622502c310f1069fd9f41cd38210553115f610a Mon Sep 17 00:00:00 2001 +From: Nicolas Dichtel <[email protected]> +Date: Thu, 25 Jan 2024 15:18:47 +0100 +Subject: ipmr: fix kernel panic when forwarding mcast packets + +The stacktrace was: +[ 86.305548] BUG: kernel NULL pointer dereference, address: 0000000000000092 +[ 86.306815] #PF: supervisor read access in kernel mode +[ 86.307717] #PF: error_code(0x0000) - not-present page +[ 86.308624] PGD 0 P4D 0 +[ 86.309091] Oops: 0000 [#1] PREEMPT SMP NOPTI +[ 86.309883] CPU: 2 PID: 3139 Comm: pimd Tainted: G U 6.8.0-6wind-knet #1 +[ 86.311027] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.11.1-0-g0551a4be2c-prebuilt.qemu-project.org 04/01/2014 +[ 86.312728] RIP: 0010:ip_mr_forward (/build/work/knet/net/ipv4/ipmr.c:1985) +[ 86.313399] Code: f9 1f 0f 87 85 03 00 00 48 8d 04 5b 48 8d 04 83 49 8d 44 c5 00 48 8b 40 70 48 39 c2 0f 84 d9 00 00 00 49 8b 46 58 48 83 e0 fe <80> b8 92 00 00 00 00 0f 84 55 ff ff ff 49 83 47 38 01 45 85 e4 0f +[ 86.316565] RSP: 0018:ffffad21c0583ae0 EFLAGS: 00010246 +[ 86.317497] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 +[ 86.318596] RDX: ffff9559cb46c000 RSI: 0000000000000000 RDI: 0000000000000000 +[ 86.319627] RBP: ffffad21c0583b30 R08: 0000000000000000 R09: 0000000000000000 +[ 86.320650] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 +[ 86.321672] R13: ffff9559c093a000 R14: ffff9559cc00b800 R15: ffff9559c09c1d80 +[ 86.322873] FS: 00007f85db661980(0000) GS:ffff955a79d00000(0000) knlGS:0000000000000000 +[ 86.324291] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 +[ 86.325314] CR2: 0000000000000092 CR3: 000000002f13a000 CR4: 0000000000350ef0 +[ 86.326589] Call Trace: +[ 86.327036] <TASK> +[ 86.327434] ? show_regs (/build/work/knet/arch/x86/kernel/dumpstack.c:479) +[ 86.328049] ? __die (/build/work/knet/arch/x86/kernel/dumpstack.c:421 /build/work/knet/arch/x86/kernel/dumpstack.c:434) +[ 86.328508] ? page_fault_oops (/build/work/knet/arch/x86/mm/fault.c:707) +[ 86.329107] ? do_user_addr_fault (/build/work/knet/arch/x86/mm/fault.c:1264) +[ 86.329756] ? srso_return_thunk (/build/work/knet/arch/x86/lib/retpoline.S:223) +[ 86.330350] ? __irq_work_queue_local (/build/work/knet/kernel/irq_work.c:111 (discriminator 1)) +[ 86.331013] ? exc_page_fault (/build/work/knet/./arch/x86/include/asm/paravirt.h:693 /build/work/knet/arch/x86/mm/fault.c:1515 /build/work/knet/arch/x86/mm/fault.c:1563) +[ 86.331702] ? asm_exc_page_fault (/build/work/knet/./arch/x86/include/asm/idtentry.h:570) +[ 86.332468] ? ip_mr_forward (/build/work/knet/net/ipv4/ipmr.c:1985) +[ 86.333183] ? srso_return_thunk (/build/work/knet/arch/x86/lib/retpoline.S:223) +[ 86.333920] ipmr_mfc_add (/build/work/knet/./include/linux/rcupdate.h:782 /build/work/knet/net/ipv4/ipmr.c:1009 /build/work/knet/net/ipv4/ipmr.c:1273) +[ 86.334583] ? __pfx_ipmr_hash_cmp (/build/work/knet/net/ipv4/ipmr.c:363) +[ 86.335357] ip_mroute_setsockopt (/build/work/knet/net/ipv4/ipmr.c:1470) +[ 86.336135] ? srso_return_thunk (/build/work/knet/arch/x86/lib/retpoline.S:223) +[ 86.336854] ? ip_mroute_setsockopt (/build/work/knet/net/ipv4/ipmr.c:1470) +[ 86.337679] do_ip_setsockopt (/build/work/knet/net/ipv4/ip_sockglue.c:944) +[ 86.338408] ? __pfx_unix_stream_read_actor (/build/work/knet/net/unix/af_unix.c:2862) +[ 86.339232] ? srso_return_thunk (/build/work/knet/arch/x86/lib/retpoline.S:223) +[ 86.339809] ? aa_sk_perm (/build/work/knet/security/apparmor/include/cred.h:153 /build/work/knet/security/apparmor/net.c:181) +[ 86.340342] ip_setsockopt (/build/work/knet/net/ipv4/ip_sockglue.c:1415) +[ 86.340859] raw_setsockopt (/build/work/knet/net/ipv4/raw.c:836) +[ 86.341408] ? security_socket_setsockopt (/build/work/knet/security/security.c:4561 (discriminator 13)) +[ 86.342116] sock_common_setsockopt (/build/work/knet/net/core/sock.c:3716) +[ 86.342747] do_sock_setsockopt (/build/work/knet/net/socket.c:2313) +[ 86.343363] __sys_setsockopt (/build/work/knet/./include/linux/file.h:32 /build/work/knet/net/socket.c:2336) +[ 86.344020] __x64_sys_setsockopt (/build/work/knet/net/socket.c:2340) +[ 86.344766] do_syscall_64 (/build/work/knet/arch/x86/entry/common.c:52 /build/work/knet/arch/x86/entry/common.c:83) +[ 86.345433] ? srso_return_thunk (/build/work/knet/arch/x86/lib/retpoline.S:223) +[ 86.346161] ? syscall_exit_work (/build/work/knet/./include/linux/audit.h:357 /build/work/knet/kernel/entry/common.c:160) +[ 86.346938] ? srso_return_thunk (/build/work/knet/arch/x86/lib/retpoline.S:223) +[ 86.347657] ? syscall_exit_to_user_mode (/build/work/knet/kernel/entry/common.c:215) +[ 86.348538] ? srso_return_thunk (/build/work/knet/arch/x86/lib/retpoline.S:223) +[ 86.349262] ? do_syscall_64 (/build/work/knet/./arch/x86/include/asm/cpufeature.h:171 /build/work/knet/arch/x86/entry/common.c:98) +[ 86.349971] entry_SYSCALL_64_after_hwframe (/build/work/knet/arch/x86/entry/entry_64.S:129) + +The original packet in ipmr_cache_report() may be queued and then forwarded +with ip_mr_forward(). This last function has the assumption that the skb +dst is set. + +After the below commit, the skb dst is dropped by ipv4_pktinfo_prepare(), +which causes the oops. + +Fixes: bb7403655b3c ("ipmr: support IP_PKTINFO on cache report IGMP msg") +Signed-off-by: Nicolas Dichtel <[email protected]> +Reviewed-by: Eric Dumazet <[email protected]> +Link: https://lore.kernel.org/r/[email protected] +Signed-off-by: Jakub Kicinski <[email protected]> +--- + include/net/ip.h | 2 +- + net/ipv4/ip_sockglue.c | 6 ++++-- + net/ipv4/ipmr.c | 2 +- + net/ipv4/raw.c | 2 +- + net/ipv4/udp.c | 2 +- + 5 files changed, 8 insertions(+), 6 deletions(-) + +diff --git a/include/net/ip.h b/include/net/ip.h +index de0c69c57e3cb..25cb688bdc623 100644 +--- a/include/net/ip.h ++++ b/include/net/ip.h +@@ -767,7 +767,7 @@ int ip_options_rcv_srr(struct sk_buff *skb, struct net_device *dev); + * Functions provided by ip_sockglue.c + */ + +-void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb); ++void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb, bool drop_dst); + void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, + struct sk_buff *skb, int tlen, int offset); + int ip_cmsg_send(struct sock *sk, struct msghdr *msg, +diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c +index 7aa9dc0e6760d..21d2ffa919e98 100644 +--- a/net/ipv4/ip_sockglue.c ++++ b/net/ipv4/ip_sockglue.c +@@ -1363,12 +1363,13 @@ e_inval: + * ipv4_pktinfo_prepare - transfer some info from rtable to skb + * @sk: socket + * @skb: buffer ++ * @drop_dst: if true, drops skb dst + * + * To support IP_CMSG_PKTINFO option, we store rt_iif and specific + * destination in skb->cb[] before dst drop. + * This way, receiver doesn't make cache line misses to read rtable. + */ +-void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) ++void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb, bool drop_dst) + { + struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); + bool prepare = inet_test_bit(PKTINFO, sk) || +@@ -1397,7 +1398,8 @@ void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) + pktinfo->ipi_ifindex = 0; + pktinfo->ipi_spec_dst.s_addr = 0; + } +- skb_dst_drop(skb); ++ if (drop_dst) ++ skb_dst_drop(skb); + } + + int ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, +diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c +index 9d6f59531b3a0..3622298365105 100644 +--- a/net/ipv4/ipmr.c ++++ b/net/ipv4/ipmr.c +@@ -1073,7 +1073,7 @@ static int ipmr_cache_report(const struct mr_table *mrt, + msg = (struct igmpmsg *)skb_network_header(skb); + msg->im_vif = vifi; + msg->im_vif_hi = vifi >> 8; +- ipv4_pktinfo_prepare(mroute_sk, pkt); ++ ipv4_pktinfo_prepare(mroute_sk, pkt, false); + memcpy(skb->cb, pkt->cb, sizeof(skb->cb)); + /* Add our header */ + igmp = skb_put(skb, sizeof(struct igmphdr)); +diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c +index 27da9d7294c0b..aea89326c6979 100644 +--- a/net/ipv4/raw.c ++++ b/net/ipv4/raw.c +@@ -292,7 +292,7 @@ static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb) + + /* Charge it to the socket. */ + +- ipv4_pktinfo_prepare(sk, skb); ++ ipv4_pktinfo_prepare(sk, skb, true); + if (sock_queue_rcv_skb_reason(sk, skb, &reason) < 0) { + kfree_skb_reason(skb, reason); + return NET_RX_DROP; +diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c +index 148ffb007969f..f631b0a21af4c 100644 +--- a/net/ipv4/udp.c ++++ b/net/ipv4/udp.c +@@ -2169,7 +2169,7 @@ static int udp_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb) + + udp_csum_pull_header(skb); + +- ipv4_pktinfo_prepare(sk, skb); ++ ipv4_pktinfo_prepare(sk, skb, true); + return __udp_queue_rcv_skb(sk, skb); + + csum_error: +-- +cgit 1.2.3-korg +
