Fix CVE-2017-8890 CVE-2017-9074 CVE-2017-9075 CVE-2017-9076 CVE-2017-9077
This commit is contained in:
Justin M. Forbes
parent
bc1e93ab0b
commit
9f8b4e17d7
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@ -0,0 +1,41 @@
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From 657831ffc38e30092a2d5f03d385d710eb88b09a Mon Sep 17 00:00:00 2001
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From: Eric Dumazet <edumazet@google.com>
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Date: Tue, 9 May 2017 06:29:19 -0700
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Subject: [PATCH] dccp/tcp: do not inherit mc_list from parent
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syzkaller found a way to trigger double frees from ip_mc_drop_socket()
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It turns out that leave a copy of parent mc_list at accept() time,
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which is very bad.
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Very similar to commit 8b485ce69876 ("tcp: do not inherit
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fastopen_req from parent")
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Initial report from Pray3r, completed by Andrey one.
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Thanks a lot to them !
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Signed-off-by: Eric Dumazet <edumazet@google.com>
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Reported-by: Pray3r <pray3r.z@gmail.com>
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Reported-by: Andrey Konovalov <andreyknvl@google.com>
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Tested-by: Andrey Konovalov <andreyknvl@google.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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net/ipv4/inet_connection_sock.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
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index 5e313c1..1054d33 100644
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--- a/net/ipv4/inet_connection_sock.c
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+++ b/net/ipv4/inet_connection_sock.c
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@@ -794,6 +794,8 @@ struct sock *inet_csk_clone_lock(const struct sock *sk,
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/* listeners have SOCK_RCU_FREE, not the children */
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sock_reset_flag(newsk, SOCK_RCU_FREE);
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+ inet_sk(newsk)->mc_list = NULL;
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+
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newsk->sk_mark = inet_rsk(req)->ir_mark;
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atomic64_set(&newsk->sk_cookie,
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atomic64_read(&inet_rsk(req)->ir_cookie));
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--
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2.9.4
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@ -0,0 +1,231 @@
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From 2423496af35d94a87156b063ea5cedffc10a70a1 Mon Sep 17 00:00:00 2001
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From: Craig Gallek <kraig@google.com>
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Date: Tue, 16 May 2017 14:36:23 -0400
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Subject: [PATCH] ipv6: Prevent overrun when parsing v6 header options
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The KASAN warning repoted below was discovered with a syzkaller
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program. The reproducer is basically:
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int s = socket(AF_INET6, SOCK_RAW, NEXTHDR_HOP);
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send(s, &one_byte_of_data, 1, MSG_MORE);
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send(s, &more_than_mtu_bytes_data, 2000, 0);
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The socket() call sets the nexthdr field of the v6 header to
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NEXTHDR_HOP, the first send call primes the payload with a non zero
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byte of data, and the second send call triggers the fragmentation path.
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The fragmentation code tries to parse the header options in order
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to figure out where to insert the fragment option. Since nexthdr points
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to an invalid option, the calculation of the size of the network header
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can made to be much larger than the linear section of the skb and data
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is read outside of it.
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This fix makes ip6_find_1stfrag return an error if it detects
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running out-of-bounds.
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[ 42.361487] ==================================================================
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[ 42.364412] BUG: KASAN: slab-out-of-bounds in ip6_fragment+0x11c8/0x3730
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[ 42.365471] Read of size 840 at addr ffff88000969e798 by task ip6_fragment-oo/3789
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[ 42.366469]
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[ 42.366696] CPU: 1 PID: 3789 Comm: ip6_fragment-oo Not tainted 4.11.0+ #41
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[ 42.367628] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.1-1ubuntu1 04/01/2014
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[ 42.368824] Call Trace:
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[ 42.369183] dump_stack+0xb3/0x10b
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[ 42.369664] print_address_description+0x73/0x290
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[ 42.370325] kasan_report+0x252/0x370
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[ 42.370839] ? ip6_fragment+0x11c8/0x3730
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[ 42.371396] check_memory_region+0x13c/0x1a0
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[ 42.371978] memcpy+0x23/0x50
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[ 42.372395] ip6_fragment+0x11c8/0x3730
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[ 42.372920] ? nf_ct_expect_unregister_notifier+0x110/0x110
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[ 42.373681] ? ip6_copy_metadata+0x7f0/0x7f0
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[ 42.374263] ? ip6_forward+0x2e30/0x2e30
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[ 42.374803] ip6_finish_output+0x584/0x990
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[ 42.375350] ip6_output+0x1b7/0x690
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[ 42.375836] ? ip6_finish_output+0x990/0x990
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[ 42.376411] ? ip6_fragment+0x3730/0x3730
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[ 42.376968] ip6_local_out+0x95/0x160
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[ 42.377471] ip6_send_skb+0xa1/0x330
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[ 42.377969] ip6_push_pending_frames+0xb3/0xe0
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[ 42.378589] rawv6_sendmsg+0x2051/0x2db0
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[ 42.379129] ? rawv6_bind+0x8b0/0x8b0
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[ 42.379633] ? _copy_from_user+0x84/0xe0
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[ 42.380193] ? debug_check_no_locks_freed+0x290/0x290
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[ 42.380878] ? ___sys_sendmsg+0x162/0x930
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[ 42.381427] ? rcu_read_lock_sched_held+0xa3/0x120
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[ 42.382074] ? sock_has_perm+0x1f6/0x290
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[ 42.382614] ? ___sys_sendmsg+0x167/0x930
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[ 42.383173] ? lock_downgrade+0x660/0x660
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[ 42.383727] inet_sendmsg+0x123/0x500
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[ 42.384226] ? inet_sendmsg+0x123/0x500
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[ 42.384748] ? inet_recvmsg+0x540/0x540
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[ 42.385263] sock_sendmsg+0xca/0x110
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[ 42.385758] SYSC_sendto+0x217/0x380
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[ 42.386249] ? SYSC_connect+0x310/0x310
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[ 42.386783] ? __might_fault+0x110/0x1d0
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[ 42.387324] ? lock_downgrade+0x660/0x660
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[ 42.387880] ? __fget_light+0xa1/0x1f0
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[ 42.388403] ? __fdget+0x18/0x20
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[ 42.388851] ? sock_common_setsockopt+0x95/0xd0
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[ 42.389472] ? SyS_setsockopt+0x17f/0x260
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[ 42.390021] ? entry_SYSCALL_64_fastpath+0x5/0xbe
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[ 42.390650] SyS_sendto+0x40/0x50
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[ 42.391103] entry_SYSCALL_64_fastpath+0x1f/0xbe
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[ 42.391731] RIP: 0033:0x7fbbb711e383
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[ 42.392217] RSP: 002b:00007ffff4d34f28 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
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[ 42.393235] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbbb711e383
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[ 42.394195] RDX: 0000000000001000 RSI: 00007ffff4d34f60 RDI: 0000000000000003
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[ 42.395145] RBP: 0000000000000046 R08: 00007ffff4d34f40 R09: 0000000000000018
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[ 42.396056] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000400aad
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[ 42.396598] R13: 0000000000000066 R14: 00007ffff4d34ee0 R15: 00007fbbb717af00
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[ 42.397257]
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[ 42.397411] Allocated by task 3789:
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[ 42.397702] save_stack_trace+0x16/0x20
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[ 42.398005] save_stack+0x46/0xd0
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[ 42.398267] kasan_kmalloc+0xad/0xe0
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[ 42.398548] kasan_slab_alloc+0x12/0x20
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[ 42.398848] __kmalloc_node_track_caller+0xcb/0x380
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[ 42.399224] __kmalloc_reserve.isra.32+0x41/0xe0
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[ 42.399654] __alloc_skb+0xf8/0x580
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[ 42.400003] sock_wmalloc+0xab/0xf0
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[ 42.400346] __ip6_append_data.isra.41+0x2472/0x33d0
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[ 42.400813] ip6_append_data+0x1a8/0x2f0
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[ 42.401122] rawv6_sendmsg+0x11ee/0x2db0
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[ 42.401505] inet_sendmsg+0x123/0x500
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[ 42.401860] sock_sendmsg+0xca/0x110
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[ 42.402209] ___sys_sendmsg+0x7cb/0x930
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[ 42.402582] __sys_sendmsg+0xd9/0x190
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[ 42.402941] SyS_sendmsg+0x2d/0x50
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[ 42.403273] entry_SYSCALL_64_fastpath+0x1f/0xbe
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[ 42.403718]
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[ 42.403871] Freed by task 1794:
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[ 42.404146] save_stack_trace+0x16/0x20
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[ 42.404515] save_stack+0x46/0xd0
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[ 42.404827] kasan_slab_free+0x72/0xc0
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[ 42.405167] kfree+0xe8/0x2b0
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[ 42.405462] skb_free_head+0x74/0xb0
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[ 42.405806] skb_release_data+0x30e/0x3a0
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[ 42.406198] skb_release_all+0x4a/0x60
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[ 42.406563] consume_skb+0x113/0x2e0
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[ 42.406910] skb_free_datagram+0x1a/0xe0
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[ 42.407288] netlink_recvmsg+0x60d/0xe40
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[ 42.407667] sock_recvmsg+0xd7/0x110
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[ 42.408022] ___sys_recvmsg+0x25c/0x580
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[ 42.408395] __sys_recvmsg+0xd6/0x190
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[ 42.408753] SyS_recvmsg+0x2d/0x50
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[ 42.409086] entry_SYSCALL_64_fastpath+0x1f/0xbe
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[ 42.409513]
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[ 42.409665] The buggy address belongs to the object at ffff88000969e780
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[ 42.409665] which belongs to the cache kmalloc-512 of size 512
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[ 42.410846] The buggy address is located 24 bytes inside of
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[ 42.410846] 512-byte region [ffff88000969e780, ffff88000969e980)
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[ 42.411941] The buggy address belongs to the page:
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[ 42.412405] page:ffffea000025a780 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0
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[ 42.413298] flags: 0x100000000008100(slab|head)
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[ 42.413729] raw: 0100000000008100 0000000000000000 0000000000000000 00000001800c000c
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[ 42.414387] raw: ffffea00002a9500 0000000900000007 ffff88000c401280 0000000000000000
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[ 42.415074] page dumped because: kasan: bad access detected
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[ 42.415604]
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[ 42.415757] Memory state around the buggy address:
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[ 42.416222] ffff88000969e880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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[ 42.416904] ffff88000969e900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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[ 42.417591] >ffff88000969e980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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[ 42.418273] ^
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[ 42.418588] ffff88000969ea00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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[ 42.419273] ffff88000969ea80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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[ 42.419882] ==================================================================
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Reported-by: Andrey Konovalov <andreyknvl@google.com>
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Signed-off-by: Craig Gallek <kraig@google.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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net/ipv6/ip6_offload.c | 2 ++
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net/ipv6/ip6_output.c | 4 ++++
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net/ipv6/output_core.c | 14 ++++++++------
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net/ipv6/udp_offload.c | 2 ++
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4 files changed, 16 insertions(+), 6 deletions(-)
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diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
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index 93e58a5..eab36ab 100644
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--- a/net/ipv6/ip6_offload.c
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+++ b/net/ipv6/ip6_offload.c
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@@ -117,6 +117,8 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
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if (udpfrag) {
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unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
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+ if (unfrag_ip6hlen < 0)
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+ return ERR_PTR(unfrag_ip6hlen);
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fptr = (struct frag_hdr *)((u8 *)ipv6h + unfrag_ip6hlen);
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fptr->frag_off = htons(offset);
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if (skb->next)
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diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
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index 58f6288..01deecd 100644
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--- a/net/ipv6/ip6_output.c
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+++ b/net/ipv6/ip6_output.c
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@@ -598,6 +598,10 @@ int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
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u8 *prevhdr, nexthdr = 0;
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hlen = ip6_find_1stfragopt(skb, &prevhdr);
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+ if (hlen < 0) {
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+ err = hlen;
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+ goto fail;
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+ }
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nexthdr = *prevhdr;
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mtu = ip6_skb_dst_mtu(skb);
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diff --git a/net/ipv6/output_core.c b/net/ipv6/output_core.c
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index cd42523..e9065b8 100644
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--- a/net/ipv6/output_core.c
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+++ b/net/ipv6/output_core.c
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@@ -79,14 +79,13 @@ EXPORT_SYMBOL(ipv6_select_ident);
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int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr)
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{
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u16 offset = sizeof(struct ipv6hdr);
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- struct ipv6_opt_hdr *exthdr =
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- (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
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unsigned int packet_len = skb_tail_pointer(skb) -
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skb_network_header(skb);
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int found_rhdr = 0;
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*nexthdr = &ipv6_hdr(skb)->nexthdr;
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- while (offset + 1 <= packet_len) {
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+ while (offset <= packet_len) {
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+ struct ipv6_opt_hdr *exthdr;
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switch (**nexthdr) {
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@@ -107,13 +106,16 @@ int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr)
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return offset;
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}
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- offset += ipv6_optlen(exthdr);
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- *nexthdr = &exthdr->nexthdr;
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+ if (offset + sizeof(struct ipv6_opt_hdr) > packet_len)
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+ return -EINVAL;
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+
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exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) +
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offset);
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+ offset += ipv6_optlen(exthdr);
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+ *nexthdr = &exthdr->nexthdr;
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}
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- return offset;
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+ return -EINVAL;
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}
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EXPORT_SYMBOL(ip6_find_1stfragopt);
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diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c
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index ac858c4..b348cff 100644
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--- a/net/ipv6/udp_offload.c
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+++ b/net/ipv6/udp_offload.c
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@@ -91,6 +91,8 @@ static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
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* bytes to insert fragment header.
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*/
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unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
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+ if (unfrag_ip6hlen < 0)
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+ return ERR_PTR(unfrag_ip6hlen);
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nexthdr = *prevhdr;
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*prevhdr = NEXTHDR_FRAGMENT;
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unfrag_len = (skb_network_header(skb) - skb_mac_header(skb)) +
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--
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2.9.4
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@ -0,0 +1,64 @@
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From 83eaddab4378db256d00d295bda6ca997cd13a52 Mon Sep 17 00:00:00 2001
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From: WANG Cong <xiyou.wangcong@gmail.com>
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Date: Tue, 9 May 2017 16:59:54 -0700
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Subject: [PATCH] ipv6/dccp: do not inherit ipv6_mc_list from parent
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Like commit 657831ffc38e ("dccp/tcp: do not inherit mc_list from parent")
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we should clear ipv6_mc_list etc. for IPv6 sockets too.
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Cc: Eric Dumazet <edumazet@google.com>
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Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
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Acked-by: Eric Dumazet <edumazet@google.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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net/dccp/ipv6.c | 6 ++++++
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net/ipv6/tcp_ipv6.c | 2 ++
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2 files changed, 8 insertions(+)
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diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
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index d9b6a4e..b6bbb71 100644
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--- a/net/dccp/ipv6.c
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+++ b/net/dccp/ipv6.c
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@@ -426,6 +426,9 @@ static struct sock *dccp_v6_request_recv_sock(const struct sock *sk,
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newsk->sk_backlog_rcv = dccp_v4_do_rcv;
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newnp->pktoptions = NULL;
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newnp->opt = NULL;
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+ newnp->ipv6_mc_list = NULL;
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+ newnp->ipv6_ac_list = NULL;
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+ newnp->ipv6_fl_list = NULL;
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newnp->mcast_oif = inet6_iif(skb);
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newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
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@@ -490,6 +493,9 @@ static struct sock *dccp_v6_request_recv_sock(const struct sock *sk,
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/* Clone RX bits */
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newnp->rxopt.all = np->rxopt.all;
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+ newnp->ipv6_mc_list = NULL;
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+ newnp->ipv6_ac_list = NULL;
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+ newnp->ipv6_fl_list = NULL;
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newnp->pktoptions = NULL;
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newnp->opt = NULL;
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newnp->mcast_oif = inet6_iif(skb);
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diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
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index aeb9497..df5a9ff 100644
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--- a/net/ipv6/tcp_ipv6.c
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+++ b/net/ipv6/tcp_ipv6.c
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@@ -1062,6 +1062,7 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *
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newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
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#endif
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+ newnp->ipv6_mc_list = NULL;
|
||||
newnp->ipv6_ac_list = NULL;
|
||||
newnp->ipv6_fl_list = NULL;
|
||||
newnp->pktoptions = NULL;
|
||||
@@ -1131,6 +1132,7 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *
|
||||
First: no IPv4 options.
|
||||
*/
|
||||
newinet->inet_opt = NULL;
|
||||
+ newnp->ipv6_mc_list = NULL;
|
||||
newnp->ipv6_ac_list = NULL;
|
||||
newnp->ipv6_fl_list = NULL;
|
||||
|
||||
--
|
||||
2.9.4
|
||||
|
||||
|
|
@ -0,0 +1,33 @@
|
|||
From fdcee2cbb8438702ea1b328fb6e0ac5e9a40c7f8 Mon Sep 17 00:00:00 2001
|
||||
From: Eric Dumazet <edumazet@google.com>
|
||||
Date: Wed, 17 May 2017 07:16:40 -0700
|
||||
Subject: [PATCH] sctp: do not inherit ipv6_{mc|ac|fl}_list from parent
|
||||
|
||||
SCTP needs fixes similar to 83eaddab4378 ("ipv6/dccp: do not inherit
|
||||
ipv6_mc_list from parent"), otherwise bad things can happen.
|
||||
|
||||
Signed-off-by: Eric Dumazet <edumazet@google.com>
|
||||
Reported-by: Andrey Konovalov <andreyknvl@google.com>
|
||||
Tested-by: Andrey Konovalov <andreyknvl@google.com>
|
||||
Signed-off-by: David S. Miller <davem@davemloft.net>
|
||||
---
|
||||
net/sctp/ipv6.c | 3 +++
|
||||
1 file changed, 3 insertions(+)
|
||||
|
||||
diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
|
||||
index 142b70e..f5b45b8 100644
|
||||
--- a/net/sctp/ipv6.c
|
||||
+++ b/net/sctp/ipv6.c
|
||||
@@ -677,6 +677,9 @@ static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
|
||||
newnp = inet6_sk(newsk);
|
||||
|
||||
memcpy(newnp, np, sizeof(struct ipv6_pinfo));
|
||||
+ newnp->ipv6_mc_list = NULL;
|
||||
+ newnp->ipv6_ac_list = NULL;
|
||||
+ newnp->ipv6_fl_list = NULL;
|
||||
|
||||
rcu_read_lock();
|
||||
opt = rcu_dereference(np->opt);
|
||||
--
|
||||
2.9.4
|
||||
|
||||
14
kernel.spec
14
kernel.spec
|
|
@ -611,6 +611,18 @@ Patch865: 0001-ipx-call-ipxitf_put-in-ioctl-error-path.patch
|
|||
Patch866: 0001-SUNRPC-Refactor-svc_set_num_threads.patch
|
||||
Patch867: 0002-NFSv4-Fix-callback-server-shutdown.patch
|
||||
|
||||
#CVE-2017-8890 rhbz 1450972
|
||||
Patch868: 0001-dccp-tcp-do-not-inherit-mc_list-from-parent.patch
|
||||
|
||||
#CVE-2017-9074 rhbz 1452679
|
||||
Patch869: 0001-ipv6-Prevent-overrun-when-parsing-v6-header-options.patch
|
||||
|
||||
#CVE-2017-9075 rhbz 1452691
|
||||
Patch870: 0001-sctp-do-not-inherit-ipv6_-mc-ac-fl-_list-from-parent.patch
|
||||
|
||||
#CVE-2017-9076 CVE-2017-9077 rhbz 1452688 1452744
|
||||
Patch871: 0001-ipv6-dccp-do-not-inherit-ipv6_mc_list-from-parent.patch
|
||||
|
||||
# END OF PATCH DEFINITIONS
|
||||
|
||||
%endif
|
||||
|
|
@ -2182,6 +2194,8 @@ fi
|
|||
%changelog
|
||||
* Mon May 22 2017 Justin M. Forbes <jforbes@fedoraproject.org> - 4.10.17-200
|
||||
- Linux v4.10.17
|
||||
- Fix CVE-2017-8890 CVE-2017-9074 CVE-2017-9075 CVE-2017-9076 CVE-2017-9077
|
||||
(rhbz 1452688 1450972 1452679 1452691 1452688 1452744)
|
||||
|
||||
* Thu May 18 2017 Justin M. Forbes <jforbes@fedoraproject.org>
|
||||
- Fix CVE-2017-9059 (rhbz 1451386 1451996)
|
||||
|
|
|
|||
Loading…
Reference in New Issue