syzbot


KASAN: slab-use-after-free Read in __unix_gc

Status: closed as dup on 2024/02/10 08:11
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+5a630f8ca0120ab43f55@syzkaller.appspotmail.com
First crash: 133d, last: 126d
Cause bisection: failed (error log, bisect log)
  
Duplicate of
Title Repro Cause bisect Fix bisect Count Last Reported
INFO: task hung in unix_dgram_sendmsg net C done 36 114d 132d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [kernel?] KASAN: slab-use-after-free Read in __unix_gc 4 (8) 2024/02/10 11:39
Last patch testing requests (3)
Created Duration User Patch Repo Result
2024/02/10 10:07 1h17m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git main OK log
2024/02/10 06:35 18m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git main report log
2024/02/10 02:25 33m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git e7689879d14e error OK

Sample crash report:
==================================================================
BUG: KASAN: slab-use-after-free in __unix_gc+0xe0f/0xf70
Read of size 8 at addr ffff88807d8e4e40 by task kworker/u4:0/11

CPU: 0 PID: 11 Comm: kworker/u4:0 Not tainted 6.8.0-rc3-syzkaller-00831-g4ec1d5fd384e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Workqueue: events_unbound __unix_gc
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x167/0x540 mm/kasan/report.c:488
 kasan_report+0x142/0x180 mm/kasan/report.c:601
 __unix_gc+0xe0f/0xf70
 process_one_work kernel/workqueue.c:2633 [inline]
 process_scheduled_works+0x913/0x1420 kernel/workqueue.c:2706
 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787
 kthread+0x2ef/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242
 </TASK>

Allocated by task 5078:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:314 [inline]
 __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:340
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3813 [inline]
 slab_alloc_node mm/slub.c:3860 [inline]
 kmem_cache_alloc+0x16f/0x340 mm/slub.c:3867
 sk_prot_alloc+0x58/0x210 net/core/sock.c:2073
 sk_alloc+0x38/0x370 net/core/sock.c:2132
 unix_create1+0xb4/0x7f0
 unix_create+0x14e/0x200 net/unix/af_unix.c:1047
 __sock_create+0x48f/0x920 net/socket.c:1571
 sock_create net/socket.c:1622 [inline]
 __sys_socketpair+0x2c9/0x720 net/socket.c:1769
 __do_sys_socketpair net/socket.c:1822 [inline]
 __se_sys_socketpair net/socket.c:1819 [inline]
 __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1819
 do_syscall_64+0xf9/0x240
 entry_SYSCALL_64_after_hwframe+0x6f/0x77

Freed by task 925:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x4e/0x60 mm/kasan/generic.c:640
 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:241
 __kasan_slab_free+0x34/0x70 mm/kasan/common.c:257
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2121 [inline]
 slab_free mm/slub.c:4299 [inline]
 kmem_cache_free+0x102/0x2a0 mm/slub.c:4363
 sk_prot_free net/core/sock.c:2113 [inline]
 __sk_destruct+0x470/0x5f0 net/core/sock.c:2207
 sock_put include/net/sock.h:1961 [inline]
 unix_release_sock+0xa90/0xd20 net/unix/af_unix.c:665
 unix_release+0x91/0xc0 net/unix/af_unix.c:1062
 __sock_release net/socket.c:659 [inline]
 sock_close+0xbc/0x240 net/socket.c:1421
 __fput+0x429/0x8a0 fs/file_table.c:376
 delayed_fput+0x59/0x80 fs/file_table.c:399
 process_one_work kernel/workqueue.c:2633 [inline]
 process_scheduled_works+0x913/0x1420 kernel/workqueue.c:2706
 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787
 kthread+0x2ef/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242

The buggy address belongs to the object at ffff88807d8e4800
 which belongs to the cache UNIX-STREAM of size 1920
The buggy address is located 1600 bytes inside of
 freed 1920-byte region [ffff88807d8e4800, ffff88807d8e4f80)

The buggy address belongs to the physical page:
page:ffffea0001f63800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7d8e0
head:ffffea0001f63800 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888017fe53c0 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5070, tgid 5070 (sshd), ts 65681955468, free_ts 65665824674
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533
 prep_new_page mm/page_alloc.c:1540 [inline]
 get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311
 __alloc_pages+0x255/0x680 mm/page_alloc.c:4567
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 alloc_slab_page+0x5f/0x160 mm/slub.c:2190
 allocate_slab mm/slub.c:2354 [inline]
 new_slab+0x84/0x2f0 mm/slub.c:2407
 ___slab_alloc+0xd17/0x13e0 mm/slub.c:3540
 __slab_alloc mm/slub.c:3625 [inline]
 __slab_alloc_node mm/slub.c:3678 [inline]
 slab_alloc_node mm/slub.c:3850 [inline]
 kmem_cache_alloc+0x24d/0x340 mm/slub.c:3867
 sk_prot_alloc+0x58/0x210 net/core/sock.c:2073
 sk_alloc+0x38/0x370 net/core/sock.c:2132
 unix_create1+0xb4/0x7f0
 unix_stream_connect+0x348/0x1110 net/unix/af_unix.c:1511
 __sys_connect_file net/socket.c:2048 [inline]
 __sys_connect+0x2df/0x310 net/socket.c:2065
 __do_sys_connect net/socket.c:2075 [inline]
 __se_sys_connect net/socket.c:2072 [inline]
 __x64_sys_connect+0x7a/0x90 net/socket.c:2072
 do_syscall_64+0xf9/0x240
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
page last free pid 5068 tgid 5068 stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1140 [inline]
 free_unref_page_prepare+0x968/0xa90 mm/page_alloc.c:2346
 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486
 discard_slab mm/slub.c:2453 [inline]
 __put_partials+0xeb/0x130 mm/slub.c:2922
 put_cpu_partial+0x17b/0x250 mm/slub.c:2997
 __slab_free+0x302/0x410 mm/slub.c:4166
 qlink_free mm/kasan/quarantine.c:160 [inline]
 qlist_free_all+0x6d/0xd0 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:324
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3813 [inline]
 slab_alloc_node mm/slub.c:3860 [inline]
 kmem_cache_alloc+0x16f/0x340 mm/slub.c:3867
 vm_area_alloc+0x24/0x1d0 kernel/fork.c:465
 mmap_region+0xbd8/0x1fa0 mm/mmap.c:2806
 do_mmap+0x7ae/0xe60 mm/mmap.c:1379
 vm_mmap_pgoff+0x1e2/0x420 mm/util.c:556
 do_syscall_64+0xf9/0x240
 entry_SYSCALL_64_after_hwframe+0x6f/0x77

Memory state around the buggy address:
 ffff88807d8e4d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807d8e4d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807d8e4e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff88807d8e4e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807d8e4f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/02/12 20:35 net-next 4ec1d5fd384e 77b23aa1 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce KASAN: slab-use-after-free Read in __unix_gc
2024/02/12 19:57 net-next 4ec1d5fd384e 77b23aa1 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce KASAN: slab-use-after-free Read in __unix_gc
2024/02/12 10:59 net-next 4ec1d5fd384e 77b23aa1 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce KASAN: slab-use-after-free Read in __unix_gc
2024/02/12 08:08 net-next 970cb1ceda17 77b23aa1 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce KASAN: slab-use-after-free Read in __unix_gc
2024/02/09 11:20 net-next e7689879d14e 7f07e9b0 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce KASAN: slab-use-after-free Read in __unix_gc
2024/02/16 10:39 net-next dfe7f12788f5 578f7538 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce KASAN: slab-use-after-free Read in __unix_gc
2024/02/15 07:45 net-next d1d77120bc28 d9b1cdd5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce KASAN: slab-use-after-free Read in __unix_gc
2024/02/13 23:31 net-next 86fe596b588f e66542d7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce KASAN: slab-use-after-free Read in __unix_gc
2024/02/12 19:29 net-next 4ec1d5fd384e 77b23aa1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce KASAN: slab-use-after-free Read in __unix_gc
2024/02/11 23:58 net-next 970cb1ceda17 77b23aa1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce KASAN: slab-use-after-free Read in __unix_gc
2024/02/10 19:02 net-next b63cc73341e0 77b23aa1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-net-next-test-gce KASAN: slab-use-after-free Read in __unix_gc
2024/02/10 00:37 net-next 4ec3b4aafc87 77b23aa1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce KASAN: slab-use-after-free Read in __unix_gc
2024/02/09 10:44 net-next e7689879d14e 7f07e9b0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce KASAN: slab-use-after-free Read in __unix_gc
2024/02/13 23:25 linux-next 46d4e2eb58e1 e66542d7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-use-after-free Read in __unix_gc
2024/02/12 00:08 linux-next 445a555e0623 77b23aa1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-use-after-free Read in __unix_gc
* Struck through repros no longer work on HEAD.