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h3-20020a92c263000000b00363cdfb7fd1mr110124ild.1.1707490637906; Fri, 09 Feb 2024 06:57:17 -0800 (PST) Date: Fri, 09 Feb 2024 06:57:17 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000ee09930610f42470@google.com> Subject: [syzbot] [kernel?] KASAN: slab-use-after-free Read in __unix_gc From: syzbot To: bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, linux-kernel@vger.kernel.org, mingo@redhat.com, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, x86@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: e7689879d14e ethtool: do not use rtnl in ethnl_default_dum.. git tree: net-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=1195b6e0180000 kernel config: https://syzkaller.appspot.com/x/.config?x=ac1116e4986e7570 dashboard link: https://syzkaller.appspot.com/bug?extid=5a630f8ca0120ab43f55 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=121d9b5c180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=165f9cec180000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/c5b791d72e1e/disk-e7689879.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/472cf2131e7b/vmlinux-e7689879.xz kernel image: https://storage.googleapis.com/syzbot-assets/c1e5a4b33244/bzImage-e7689879.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5a630f8ca0120ab43f55@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in __unix_gc+0xe0f/0xf70 Read of size 8 at addr ffff8880237e3640 by task kworker/u4:4/59 CPU: 0 PID: 59 Comm: kworker/u4:4 Not tainted 6.8.0-rc3-syzkaller-00766-ge7689879d14e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Workqueue: events_unbound __unix_gc Call Trace: __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 Allocated by task 5076: 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+0x33d/0x720 net/socket.c:1773 __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 23: 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+0x903/0xd20 net/unix/af_unix.c:649 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 ffff8880237e3000 which belongs to the cache UNIX-STREAM of size 1920 The buggy address is located 1600 bytes inside of freed 1920-byte region [ffff8880237e3000, ffff8880237e3780) The buggy address belongs to the physical page: page:ffffea00008df800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x237e0 head:ffffea00008df800 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 ffff8880183aa280 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 5069, tgid 5069 (sftp-server), ts 69550911589, free_ts 69532294849 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 5069 tgid 5069 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 ksys_mmap_pgoff+0x503/0x6e0 mm/mmap.c:1425 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Memory state around the buggy address: ffff8880237e3500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880237e3580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880237e3600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880237e3680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880237e3700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup