| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2022-48956: ipv6: avoid use-after-free in ip6_fragment() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ipv6: avoid use-after-free in ip6_fragment() |
| |
| Blamed commit claimed rcu_read_lock() was held by ip6_fragment() callers. |
| |
| It seems to not be always true, at least for UDP stack. |
| |
| syzbot reported: |
| |
| BUG: KASAN: use-after-free in ip6_dst_idev include/net/ip6_fib.h:245 [inline] |
| BUG: KASAN: use-after-free in ip6_fragment+0x2724/0x2770 net/ipv6/ip6_output.c:951 |
| Read of size 8 at addr ffff88801d403e80 by task syz-executor.3/7618 |
| |
| CPU: 1 PID: 7618 Comm: syz-executor.3 Not tainted 6.1.0-rc6-syzkaller-00012-g4312098baf37 #0 |
| Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 |
| Call Trace: |
| <TASK> |
| __dump_stack lib/dump_stack.c:88 [inline] |
| dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 |
| print_address_description mm/kasan/report.c:284 [inline] |
| print_report+0x15e/0x45d mm/kasan/report.c:395 |
| kasan_report+0xbf/0x1f0 mm/kasan/report.c:495 |
| ip6_dst_idev include/net/ip6_fib.h:245 [inline] |
| ip6_fragment+0x2724/0x2770 net/ipv6/ip6_output.c:951 |
| __ip6_finish_output net/ipv6/ip6_output.c:193 [inline] |
| ip6_finish_output+0x9a3/0x1170 net/ipv6/ip6_output.c:206 |
| NF_HOOK_COND include/linux/netfilter.h:291 [inline] |
| ip6_output+0x1f1/0x540 net/ipv6/ip6_output.c:227 |
| dst_output include/net/dst.h:445 [inline] |
| ip6_local_out+0xb3/0x1a0 net/ipv6/output_core.c:161 |
| ip6_send_skb+0xbb/0x340 net/ipv6/ip6_output.c:1966 |
| udp_v6_send_skb+0x82a/0x18a0 net/ipv6/udp.c:1286 |
| udp_v6_push_pending_frames+0x140/0x200 net/ipv6/udp.c:1313 |
| udpv6_sendmsg+0x18da/0x2c80 net/ipv6/udp.c:1606 |
| inet6_sendmsg+0x9d/0xe0 net/ipv6/af_inet6.c:665 |
| sock_sendmsg_nosec net/socket.c:714 [inline] |
| sock_sendmsg+0xd3/0x120 net/socket.c:734 |
| sock_write_iter+0x295/0x3d0 net/socket.c:1108 |
| call_write_iter include/linux/fs.h:2191 [inline] |
| new_sync_write fs/read_write.c:491 [inline] |
| vfs_write+0x9ed/0xdd0 fs/read_write.c:584 |
| ksys_write+0x1ec/0x250 fs/read_write.c:637 |
| do_syscall_x64 arch/x86/entry/common.c:50 [inline] |
| do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 |
| entry_SYSCALL_64_after_hwframe+0x63/0xcd |
| RIP: 0033:0x7fde3588c0d9 |
| Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 |
| RSP: 002b:00007fde365b6168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 |
| RAX: ffffffffffffffda RBX: 00007fde359ac050 RCX: 00007fde3588c0d9 |
| RDX: 000000000000ffdc RSI: 00000000200000c0 RDI: 000000000000000a |
| RBP: 00007fde358e7ae9 R08: 0000000000000000 R09: 0000000000000000 |
| R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 |
| R13: 00007fde35acfb1f R14: 00007fde365b6300 R15: 0000000000022000 |
| </TASK> |
| |
| Allocated by task 7618: |
| kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 |
| kasan_set_track+0x25/0x30 mm/kasan/common.c:52 |
| __kasan_slab_alloc+0x82/0x90 mm/kasan/common.c:325 |
| kasan_slab_alloc include/linux/kasan.h:201 [inline] |
| slab_post_alloc_hook mm/slab.h:737 [inline] |
| slab_alloc_node mm/slub.c:3398 [inline] |
| slab_alloc mm/slub.c:3406 [inline] |
| __kmem_cache_alloc_lru mm/slub.c:3413 [inline] |
| kmem_cache_alloc+0x2b4/0x3d0 mm/slub.c:3422 |
| dst_alloc+0x14a/0x1f0 net/core/dst.c:92 |
| ip6_dst_alloc+0x32/0xa0 net/ipv6/route.c:344 |
| ip6_rt_pcpu_alloc net/ipv6/route.c:1369 [inline] |
| rt6_make_pcpu_route net/ipv6/route.c:1417 [inline] |
| ip6_pol_route+0x901/0x1190 net/ipv6/route.c:2254 |
| pol_lookup_func include/net/ip6_fib.h:582 [inline] |
| fib6_rule_lookup+0x52e/0x6f0 net/ipv6/fib6_rules.c:121 |
| ip6_route_output_flags_noref+0x2e6/0x380 net/ipv6/route.c:2625 |
| ip6_route_output_flags+0x76/0x320 net/ipv6/route.c:2638 |
| ip6_route_output include/net/ip6_route.h:98 [inline] |
| ip6_dst_lookup_tail+0x5ab/0x1620 net/ipv6/ip6_output.c:1092 |
| ip6_dst_lookup_flow+0x90/0x1d0 net/ipv6/ip6_output.c:1222 |
| ip6_sk_dst_lookup_flow+0x553/0x980 net/ipv6/ip6_output.c:1260 |
| udpv6_sendmsg+0x151d/0x2c80 net/ipv6/udp.c:1554 |
| inet6_sendmsg+0x9d/0xe0 net/ipv6/af_inet6.c:665 |
| sock_sendmsg_nosec net/socket.c:714 [inline] |
| sock_sendmsg+0xd3/0x120 net/socket.c:734 |
| __sys_sendto+0x23a/0x340 net/socket.c:2117 |
| __do_sys_sendto net/socket.c:2129 [inline] |
| __se_sys_sendto net/socket.c:2125 [inline] |
| __x64_sys_sendto+0xe1/0x1b0 net/socket.c:2125 |
| do_syscall_x64 arch/x86/entry/common.c:50 [inline] |
| do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 |
| entry_SYSCALL_64_after_hwframe+0x63/0xcd |
| |
| Freed by task 7599: |
| kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 |
| kasan_set_track+0x25/0x30 mm/kasan/common.c:52 |
| kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:511 |
| ____kasan_slab_free mm/kasan/common.c:236 [inline] |
| ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 |
| kasan_slab_free include/linux/kasan.h:177 [inline] |
| slab_free_hook mm/slub.c:1724 [inline] |
| slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1750 |
| slab_free mm/slub.c:3661 [inline] |
| kmem_cache_free+0xee/0x5c0 mm/slub.c:3683 |
| dst_destroy+0x2ea/0x400 net/core/dst.c:127 |
| rcu_do_batch kernel/rcu/tree.c:2250 [inline] |
| rcu_core+0x81f/0x1980 kernel/rcu/tree.c:2510 |
| __do_softirq+0x1fb/0xadc kernel/softirq.c:571 |
| |
| Last potentially related work creation: |
| kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 |
| __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:481 |
| call_rcu+0x9d/0x820 kernel/rcu/tree.c:2798 |
| dst_release net/core/dst.c:177 [inline] |
| dst_release+0x7d/0xe0 net/core/dst.c:167 |
| refdst_drop include/net/dst.h:256 [inline] |
| skb_dst_drop include/net/dst.h:268 [inline] |
| skb_release_head_state+0x250/0x2a0 net/core/skbuff.c:838 |
| skb_release_all net/core/skbuff.c:852 [inline] |
| __kfree_skb net/core/skbuff.c:868 [inline] |
| kfree_skb_reason+0x151/0x4b0 net/core/skbuff.c:891 |
| kfree_skb_list_reason+0x4b/0x70 net/core/skbuff.c:901 |
| kfree_skb_list include/linux/skbuff.h:1227 [inline] |
| ip6_fragment+0x2026/0x2770 net/ipv6/ip6_output.c:949 |
| __ip6_finish_output net/ipv6/ip6_output.c:193 [inline] |
| ip6_finish_output+0x9a3/0x1170 net/ipv6/ip6_output.c:206 |
| NF_HOOK_COND include/linux/netfilter.h:291 [inline] |
| ip6_output+0x1f1/0x540 net/ipv6/ip6_output.c:227 |
| dst_output include/net/dst.h:445 [inline] |
| ip6_local_out+0xb3/0x1a0 net/ipv6/output_core.c:161 |
| ip6_send_skb+0xbb/0x340 net/ipv6/ip6_output.c:1966 |
| udp_v6_send_skb+0x82a/0x18a0 net/ipv6/udp.c:1286 |
| udp_v6_push_pending_frames+0x140/0x200 net/ipv6/udp.c:1313 |
| udpv6_sendmsg+0x18da/0x2c80 net/ipv6/udp.c:1606 |
| inet6_sendmsg+0x9d/0xe0 net/ipv6/af_inet6.c:665 |
| sock_sendmsg_nosec net/socket.c:714 [inline] |
| sock_sendmsg+0xd3/0x120 net/socket.c:734 |
| sock_write_iter+0x295/0x3d0 net/socket.c:1108 |
| call_write_iter include/linux/fs.h:2191 [inline] |
| new_sync_write fs/read_write.c:491 [inline] |
| vfs_write+0x9ed/0xdd0 fs/read_write.c:584 |
| ksys_write+0x1ec/0x250 fs/read_write.c:637 |
| do_syscall_x64 arch/x86/entry/common.c:50 [inline] |
| do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 |
| entry_SYSCALL_64_after_hwframe+0x63/0xcd |
| |
| Second to last potentially related work creation: |
| kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 |
| __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:481 |
| call_rcu+0x9d/0x820 kernel/rcu/tree.c:2798 |
| dst_release net/core/dst.c:177 [inline] |
| dst_release+0x7d/0xe0 net/core/dst.c:167 |
| refdst_drop include/net/dst.h:256 [inline] |
| skb_dst_drop include/net/dst.h:268 [inline] |
| __dev_queue_xmit+0x1b9d/0x3ba0 net/core/dev.c:4211 |
| dev_queue_xmit include/linux/netdevice.h:3008 [inline] |
| neigh_resolve_output net/core/neighbour.c:1552 [inline] |
| neigh_resolve_output+0x51b/0x840 net/core/neighbour.c:1532 |
| neigh_output include/net/neighbour.h:546 [inline] |
| ip6_finish_output2+0x56c/0x1530 net/ipv6/ip6_output.c:134 |
| __ip6_finish_output net/ipv6/ip6_output.c:195 [inline] |
| ip6_finish_output+0x694/0x1170 net/ipv6/ip6_output.c:206 |
| NF_HOOK_COND include/linux/netfilter.h:291 [inline] |
| ip6_output+0x1f1/0x540 net/ipv6/ip6_output.c:227 |
| dst_output include/net/dst.h:445 [inline] |
| NF_HOOK include/linux/netfilter.h:302 [inline] |
| NF_HOOK include/linux/netfilter.h:296 [inline] |
| mld_sendpack+0xa09/0xe70 net/ipv6/mcast.c:1820 |
| mld_send_cr net/ipv6/mcast.c:2121 [inline] |
| mld_ifc_work+0x720/0xdc0 net/ipv6/mcast.c:2653 |
| process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 |
| worker_thread+0x669/0x1090 kernel/workqueue.c:2436 |
| kthread+0x2e8/0x3a0 kernel/kthread.c:376 |
| ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 |
| |
| The buggy address belongs to the object at ffff88801d403dc0 |
| which belongs to the cache ip6_dst_cache of size 240 |
| The buggy address is located 192 bytes inside of |
| 240-byte region [ffff88801d403dc0, ffff88801d403eb0) |
| |
| The buggy address belongs to the physical page: |
| page:ffffea00007500c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1d403 |
| memcg:ffff888022f49c81 |
| flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) |
| raw: 00fff00000000200 ffffea0001ef6580 dead000000000002 ffff88814addf640 |
| raw: 0000000000000000 00000000800c000c 00000001ffffffff ffff888022f49c81 |
| page dumped because: kasan: bad access detected |
| page_owner tracks the page as allocated |
| page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 3719, tgid 3719 (kworker/0:6), ts 136223432244, free_ts 136222971441 |
| prep_new_page mm/page_alloc.c:2539 [inline] |
| get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4288 |
| __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5555 |
| alloc_pages+0x1aa/0x270 mm/mempolicy.c:2285 |
| alloc_slab_page mm/slub.c:1794 [inline] |
| allocate_slab+0x213/0x300 mm/slub.c:1939 |
| new_slab mm/slub.c:1992 [inline] |
| ___slab_alloc+0xa91/0x1400 mm/slub.c:3180 |
| __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3279 |
| slab_alloc_node mm/slub.c:3364 [inline] |
| slab_alloc mm/slub.c:3406 [inline] |
| __kmem_cache_alloc_lru mm/slub.c:3413 [inline] |
| kmem_cache_alloc+0x31a/0x3d0 mm/slub.c:3422 |
| dst_alloc+0x14a/0x1f0 net/core/dst.c:92 |
| ip6_dst_alloc+0x32/0xa0 net/ipv6/route.c:344 |
| icmp6_dst_alloc+0x71/0x680 net/ipv6/route.c:3261 |
| mld_sendpack+0x5de/0xe70 net/ipv6/mcast.c:1809 |
| mld_send_cr net/ipv6/mcast.c:2121 [inline] |
| mld_ifc_work+0x720/0xdc0 net/ipv6/mcast.c:2653 |
| process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 |
| worker_thread+0x669/0x1090 kernel/workqueue.c:2436 |
| kthread+0x2e8/0x3a0 kernel/kthread.c:376 |
| ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 |
| page last free stack trace: |
| reset_page_owner include/linux/page_owner.h:24 [inline] |
| free_pages_prepare mm/page_alloc.c:1459 [inline] |
| free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1509 |
| free_unref_page_prepare mm/page_alloc.c:3387 [inline] |
| free_unref_page+0x1d/0x4d0 mm/page_alloc.c:3483 |
| __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2586 |
| qlink_free mm/kasan/quarantine.c:168 [inline] |
| qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 |
| kasan_quarantine_reduce+0x184/0x210 mm/kasan/quarantine.c:294 |
| __kasan_slab_alloc+0x66/0x90 mm/kasan/common.c:302 |
| kasan_slab_alloc include/linux/kasan.h:201 [inline] |
| slab_post_alloc_hook mm/slab.h:737 [inline] |
| slab_alloc_node mm/slub.c:3398 [inline] |
| kmem_cache_alloc_node+0x304/0x410 mm/slub.c:3443 |
| __alloc_skb+0x214/0x300 net/core/skbuff.c:497 |
| alloc_skb include/linux/skbuff.h:1267 [inline] |
| netlink_alloc_large_skb net/netlink/af_netlink.c:1191 [inline] |
| netlink_sendmsg+0x9a6/0xe10 net/netlink/af_netlink.c:1896 |
| sock_sendmsg_nosec net/socket.c:714 [inline] |
| sock_sendmsg+0xd3/0x120 net/socket.c:734 |
| __sys_sendto+0x23a/0x340 net/socket.c:2117 |
| __do_sys_sendto net/socket.c:2129 [inline] |
| __se_sys_sendto net/socket.c:2125 [inline] |
| __x64_sys_sendto+0xe1/0x1b0 net/socket.c:2125 |
| do_syscall_x64 arch/x86/entry/common.c:50 [inline] |
| do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 |
| entry_SYSCALL_64_after_hwframe+0x63/0xcd |
| |
| The Linux kernel CVE team has assigned CVE-2022-48956 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.13 with commit 1758fd4688eb92c796e75bdb1d256dc558ef9581 and fixed in 4.14.302 with commit b3d7ff8c04a83279fb7641fc4d5aa82a602df7c0 |
| Issue introduced in 4.13 with commit 1758fd4688eb92c796e75bdb1d256dc558ef9581 and fixed in 4.19.269 with commit 7e0dcd5f3ade221a6126278aca60c8ab4cc3bce9 |
| Issue introduced in 4.13 with commit 1758fd4688eb92c796e75bdb1d256dc558ef9581 and fixed in 5.4.227 with commit 6b6d3be3661bff2746cab26147bd629aa034e094 |
| Issue introduced in 4.13 with commit 1758fd4688eb92c796e75bdb1d256dc558ef9581 and fixed in 5.10.159 with commit 8208d7e56b1e579320b9ff3712739ad2e63e1f86 |
| Issue introduced in 4.13 with commit 1758fd4688eb92c796e75bdb1d256dc558ef9581 and fixed in 5.15.83 with commit 7390c70bd431cbfa6951477e2c80a301643e284b |
| Issue introduced in 4.13 with commit 1758fd4688eb92c796e75bdb1d256dc558ef9581 and fixed in 6.0.13 with commit 9b1a468a455d8319041528778d0e684a4c062792 |
| Issue introduced in 4.13 with commit 1758fd4688eb92c796e75bdb1d256dc558ef9581 and fixed in 6.1 with commit 803e84867de59a1e5d126666d25eb4860cfd2ebe |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2022-48956 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| net/ipv6/ip6_output.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/b3d7ff8c04a83279fb7641fc4d5aa82a602df7c0 |
| https://git.kernel.org/stable/c/7e0dcd5f3ade221a6126278aca60c8ab4cc3bce9 |
| https://git.kernel.org/stable/c/6b6d3be3661bff2746cab26147bd629aa034e094 |
| https://git.kernel.org/stable/c/8208d7e56b1e579320b9ff3712739ad2e63e1f86 |
| https://git.kernel.org/stable/c/7390c70bd431cbfa6951477e2c80a301643e284b |
| https://git.kernel.org/stable/c/9b1a468a455d8319041528778d0e684a4c062792 |
| https://git.kernel.org/stable/c/803e84867de59a1e5d126666d25eb4860cfd2ebe |
