| 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-2023-52772: af_unix: fix use-after-free in unix_stream_read_actor() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| af_unix: fix use-after-free in unix_stream_read_actor() |
| |
| syzbot reported the following crash [1] |
| |
| After releasing unix socket lock, u->oob_skb can be changed |
| by another thread. We must temporarily increase skb refcount |
| to make sure this other thread will not free the skb under us. |
| |
| [1] |
| |
| BUG: KASAN: slab-use-after-free in unix_stream_read_actor+0xa7/0xc0 net/unix/af_unix.c:2866 |
| Read of size 4 at addr ffff88801f3b9cc4 by task syz-executor107/5297 |
| |
| CPU: 1 PID: 5297 Comm: syz-executor107 Not tainted 6.6.0-syzkaller-15910-gb8e3a87a627b #0 |
| Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 |
| Call Trace: |
| <TASK> |
| __dump_stack lib/dump_stack.c:88 [inline] |
| dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 |
| print_address_description mm/kasan/report.c:364 [inline] |
| print_report+0xc4/0x620 mm/kasan/report.c:475 |
| kasan_report+0xda/0x110 mm/kasan/report.c:588 |
| unix_stream_read_actor+0xa7/0xc0 net/unix/af_unix.c:2866 |
| unix_stream_recv_urg net/unix/af_unix.c:2587 [inline] |
| unix_stream_read_generic+0x19a5/0x2480 net/unix/af_unix.c:2666 |
| unix_stream_recvmsg+0x189/0x1b0 net/unix/af_unix.c:2903 |
| sock_recvmsg_nosec net/socket.c:1044 [inline] |
| sock_recvmsg+0xe2/0x170 net/socket.c:1066 |
| ____sys_recvmsg+0x21f/0x5c0 net/socket.c:2803 |
| ___sys_recvmsg+0x115/0x1a0 net/socket.c:2845 |
| __sys_recvmsg+0x114/0x1e0 net/socket.c:2875 |
| do_syscall_x64 arch/x86/entry/common.c:51 [inline] |
| do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 |
| entry_SYSCALL_64_after_hwframe+0x63/0x6b |
| RIP: 0033:0x7fc67492c559 |
| Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 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 b0 ff ff ff f7 d8 64 89 01 48 |
| RSP: 002b:00007fc6748ab228 EFLAGS: 00000246 ORIG_RAX: 000000000000002f |
| RAX: ffffffffffffffda RBX: 000000000000001c RCX: 00007fc67492c559 |
| RDX: 0000000040010083 RSI: 0000000020000140 RDI: 0000000000000004 |
| RBP: 00007fc6749b6348 R08: 00007fc6748ab6c0 R09: 00007fc6748ab6c0 |
| R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc6749b6340 |
| R13: 00007fc6749b634c R14: 00007ffe9fac52a0 R15: 00007ffe9fac5388 |
| </TASK> |
| |
| Allocated by task 5295: |
| kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 |
| kasan_set_track+0x25/0x30 mm/kasan/common.c:52 |
| __kasan_slab_alloc+0x81/0x90 mm/kasan/common.c:328 |
| kasan_slab_alloc include/linux/kasan.h:188 [inline] |
| slab_post_alloc_hook mm/slab.h:763 [inline] |
| slab_alloc_node mm/slub.c:3478 [inline] |
| kmem_cache_alloc_node+0x180/0x3c0 mm/slub.c:3523 |
| __alloc_skb+0x287/0x330 net/core/skbuff.c:641 |
| alloc_skb include/linux/skbuff.h:1286 [inline] |
| alloc_skb_with_frags+0xe4/0x710 net/core/skbuff.c:6331 |
| sock_alloc_send_pskb+0x7e4/0x970 net/core/sock.c:2780 |
| sock_alloc_send_skb include/net/sock.h:1884 [inline] |
| queue_oob net/unix/af_unix.c:2147 [inline] |
| unix_stream_sendmsg+0xb5f/0x10a0 net/unix/af_unix.c:2301 |
| sock_sendmsg_nosec net/socket.c:730 [inline] |
| __sock_sendmsg+0xd5/0x180 net/socket.c:745 |
| ____sys_sendmsg+0x6ac/0x940 net/socket.c:2584 |
| ___sys_sendmsg+0x135/0x1d0 net/socket.c:2638 |
| __sys_sendmsg+0x117/0x1e0 net/socket.c:2667 |
| do_syscall_x64 arch/x86/entry/common.c:51 [inline] |
| do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 |
| entry_SYSCALL_64_after_hwframe+0x63/0x6b |
| |
| Freed by task 5295: |
| kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 |
| kasan_set_track+0x25/0x30 mm/kasan/common.c:52 |
| kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522 |
| ____kasan_slab_free mm/kasan/common.c:236 [inline] |
| ____kasan_slab_free+0x15b/0x1b0 mm/kasan/common.c:200 |
| kasan_slab_free include/linux/kasan.h:164 [inline] |
| slab_free_hook mm/slub.c:1800 [inline] |
| slab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1826 |
| slab_free mm/slub.c:3809 [inline] |
| kmem_cache_free+0xf8/0x340 mm/slub.c:3831 |
| kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:1015 |
| __kfree_skb net/core/skbuff.c:1073 [inline] |
| consume_skb net/core/skbuff.c:1288 [inline] |
| consume_skb+0xdf/0x170 net/core/skbuff.c:1282 |
| queue_oob net/unix/af_unix.c:2178 [inline] |
| unix_stream_sendmsg+0xd49/0x10a0 net/unix/af_unix.c:2301 |
| sock_sendmsg_nosec net/socket.c:730 [inline] |
| __sock_sendmsg+0xd5/0x180 net/socket.c:745 |
| ____sys_sendmsg+0x6ac/0x940 net/socket.c:2584 |
| ___sys_sendmsg+0x135/0x1d0 net/socket.c:2638 |
| __sys_sendmsg+0x117/0x1e0 net/socket.c:2667 |
| do_syscall_x64 arch/x86/entry/common.c:51 [inline] |
| do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 |
| entry_SYSCALL_64_after_hwframe+0x63/0x6b |
| |
| The buggy address belongs to the object at ffff88801f3b9c80 |
| which belongs to the cache skbuff_head_cache of size 240 |
| The buggy address is located 68 bytes inside of |
| freed 240-byte region [ffff88801f3b9c80, ffff88801f3b9d70) |
| |
| The buggy address belongs to the physical page: |
| page:ffffea00007cee40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1f3b9 |
| flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) |
| page_type: 0xffffffff() |
| raw: 00fff00000000800 ffff888142a60640 dead000000000122 0000000000000000 |
| raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000 |
| page dumped because: kasan: bad access detected |
| page_owner tracks the page as allocated |
| page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 5299, tgid 5283 (syz-executor107), ts 103803840339, free_ts 103600093431 |
| set_page_owner include/linux/page_owner.h:31 [inline] |
| post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1537 |
| prep_new_page mm/page_alloc.c:1544 [inline] |
| get_page_from_freelist+0xa25/0x36c0 mm/page_alloc.c:3312 |
| __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4568 |
| alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133 |
| alloc_slab_page mm/slub.c:1870 [inline] |
| allocate_slab+0x251/0x380 mm/slub.c:2017 |
| new_slab mm/slub.c:2070 [inline] |
| ___slab_alloc+0x8c7/0x1580 mm/slub.c:3223 |
| __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3322 |
| __slab_alloc_node mm/slub.c:3375 [inline] |
| slab_alloc_node mm/slub.c:3468 [inline] |
| kmem_cache_alloc_node+0x132/0x3c0 mm/slub.c:3523 |
| __alloc_skb+0x287/0x330 net/core/skbuff.c:641 |
| alloc_skb include/linux/skbuff.h:1286 [inline] |
| alloc_skb_with_frags+0xe4/0x710 net/core/skbuff.c:6331 |
| sock_alloc_send_pskb+0x7e4/0x970 net/core/sock.c:2780 |
| sock_alloc_send_skb include/net/sock.h:1884 [inline] |
| queue_oob net/unix/af_unix.c:2147 [inline] |
| unix_stream_sendmsg+0xb5f/0x10a0 net/unix/af_unix.c:2301 |
| sock_sendmsg_nosec net/socket.c:730 [inline] |
| __sock_sendmsg+0xd5/0x180 net/socket.c:745 |
| ____sys_sendmsg+0x6ac/0x940 net/socket.c:2584 |
| ___sys_sendmsg+0x135/0x1d0 net/socket.c:2638 |
| __sys_sendmsg+0x117/0x1e0 net/socket.c:2667 |
| page last free stack trace: |
| reset_page_owner include/linux/page_owner.h:24 [inline] |
| free_pages_prepare mm/page_alloc.c:1137 [inline] |
| free_unref_page_prepare+0x4f8/0xa90 mm/page_alloc.c:2347 |
| free_unref_page+0x33/0x3b0 mm/page_alloc.c:2487 |
| __unfreeze_partials+0x21d/0x240 mm/slub.c:2655 |
| qlink_free mm/kasan/quarantine.c:168 [inline] |
| qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 |
| kasan_quarantine_reduce+0x18e/0x1d0 mm/kasan/quarantine.c:294 |
| __kasan_slab_alloc+0x65/0x90 mm/kasan/common.c:305 |
| kasan_slab_alloc include/linux/kasan.h:188 [inline] |
| slab_post_alloc_hook mm/slab.h:763 [inline] |
| slab_alloc_node mm/slub.c:3478 [inline] |
| slab_alloc mm/slub.c:3486 [inline] |
| __kmem_cache_alloc_lru mm/slub.c:3493 [inline] |
| kmem_cache_alloc+0x15d/0x380 mm/slub.c:3502 |
| vm_area_dup+0x21/0x2f0 kernel/fork.c:500 |
| __split_vma+0x17d/0x1070 mm/mmap.c:2365 |
| split_vma mm/mmap.c:2437 [inline] |
| vma_modify+0x25d/0x450 mm/mmap.c:2472 |
| vma_modify_flags include/linux/mm.h:3271 [inline] |
| mprotect_fixup+0x228/0xc80 mm/mprotect.c:635 |
| do_mprotect_pkey+0x852/0xd60 mm/mprotect.c:809 |
| __do_sys_mprotect mm/mprotect.c:830 [inline] |
| __se_sys_mprotect mm/mprotect.c:827 [inline] |
| __x64_sys_mprotect+0x78/0xb0 mm/mprotect.c:827 |
| do_syscall_x64 arch/x86/entry/common.c:51 [inline] |
| do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 |
| entry_SYSCALL_64_after_hwframe+0x63/0x6b |
| |
| Memory state around the buggy address: |
| ffff88801f3b9b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb |
| ffff88801f3b9c00: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc |
| >ffff88801f3b9c80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb |
| ^ |
| ffff88801f3b9d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc |
| ffff88801f3b9d80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb |
| |
| The Linux kernel CVE team has assigned CVE-2023-52772 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15 with commit 876c14ad014d0e39c57cbfde53e13d17cdb6d645 and fixed in 5.15.140 with commit 75bcfc188abf4fae9c1d5f5dc0a03540be602eef |
| Issue introduced in 5.15 with commit 876c14ad014d0e39c57cbfde53e13d17cdb6d645 and fixed in 6.1.64 with commit d179189eec426fe4801e4b91efa1889faed12700 |
| Issue introduced in 5.15 with commit 876c14ad014d0e39c57cbfde53e13d17cdb6d645 and fixed in 6.5.13 with commit eae0b295ce16d8c8b4114c3037993191b4bb92f0 |
| Issue introduced in 5.15 with commit 876c14ad014d0e39c57cbfde53e13d17cdb6d645 and fixed in 6.6.3 with commit 069a3ec329ff43e7869a3d94c62cd03203016bce |
| Issue introduced in 5.15 with commit 876c14ad014d0e39c57cbfde53e13d17cdb6d645 and fixed in 6.7 with commit 4b7b492615cf3017190f55444f7016812b66611d |
| |
| 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-2023-52772 |
| 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/unix/af_unix.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/75bcfc188abf4fae9c1d5f5dc0a03540be602eef |
| https://git.kernel.org/stable/c/d179189eec426fe4801e4b91efa1889faed12700 |
| https://git.kernel.org/stable/c/eae0b295ce16d8c8b4114c3037993191b4bb92f0 |
| https://git.kernel.org/stable/c/069a3ec329ff43e7869a3d94c62cd03203016bce |
| https://git.kernel.org/stable/c/4b7b492615cf3017190f55444f7016812b66611d |
