From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f205.google.com (mail-il1-f205.google.com [209.85.166.205]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 747B0205AB9 for ; Tue, 22 Apr 2025 10:12:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.205 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745316750; cv=none; b=f7f0i5d1QdRRXadm+mHt+0s5FOvVz8lOHdvJ6EQAPwZEi08yTEGyvd0yUe44FZ1+dEbDKXquEqrAk3ZByd2iJMv5d5AHICDUACpSzj2GWCE7HNwiYvUrw60S9+ZQwNHei7mcxN9iWqjaMLgZvTKAgnIVf8jVEUuLmy94VwnEgZ0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745316750; c=relaxed/simple; bh=iuw8mzz4D8FzSVR6md29ftPqG/nClczLoSlv6YIjciM=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=uvHFv8FCcYrkK5AnzGovMutCyxzBmzTGwwDqzhKwzIWGFwVBqHFfAHpQD7gY5SGen8OeZ+CSzSGAn3hRVj2Wtk7z6MlxNn0kVkSmQ4418U2fDWOW5cPxXDOu3RrdBzY9HtO7JhZyiHgED2oMH430tOZ54rS3ADGbUzNRamznuAA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.205 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f205.google.com with SMTP id e9e14a558f8ab-3d90ba11afcso26798245ab.0 for ; Tue, 22 Apr 2025 03:12:28 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1745316747; x=1745921547; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=2YAH1eGiSqMrL1f9zZlMYWKFkdmMtSRfpvjTHspDKEI=; b=juFg9yDEQDSnYqsfkbExAyQ/zvLKbjYSVXRGWmlJ59I1Id7H2tKk8qqFQQKLR7dZAn aaCMdVNvA2k56zoxzUZD3kS9zkGE+0UKxVc9D/8Dz4i1yxq26Ws5doa2N0jJmawhrM32 bmSsyCOYjTYnM5Z95KMI4yjHSL68VtYWkSPmmxan7FhFxpY87/KTtVWfL5BJyDZIWU5O 8UjIImWZHUkznKTqbPBkk7U5XZA164ptwIM19hYXcp2327+qurN9GuSnoBHqJ7rC5Pwu SObc2JItsMV8/C2SwVHwVlG16yONMOl686QnamXyoVYqtsDOIffqHFNnp7UBue9D8x+Y GiWA== X-Forwarded-Encrypted: i=1; AJvYcCVRF4gxwohFxt1LCG38QXNCxgXQ+dkYDJugRw77+jd8HWXDLfz67SQhpRBbBLLtKp2FsKi49KHBzm9weNs=@vger.kernel.org X-Gm-Message-State: AOJu0Yyfrketx2dmTPBEijP2iEdvBePKLI3lJ8IzfrTbZZEdD4hupMV4 BPfpne0pM272YTOcHpICtIuWWJIvtRyNY0e4aFHOt40aBb+xOA9j2mQAGrBvLASJcJp+Ry9PjDh NfjkfkGkUYjlqpUGfToLLmPfsax8QgK/l99BVFRLkedvNJkQaaOvaGIE= X-Google-Smtp-Source: AGHT+IEmMWNLajQ/yZ4q/Mpz1u1sc8u058gxDVsx1FnIBf0/iMnGdmA+jGVROjYyPJKr0OiMEUBFtElNvrrCvDxbLfWQG/KEXLSJ Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:19c8:b0:3cf:bc71:94f5 with SMTP id e9e14a558f8ab-3d88ee51776mr142807415ab.22.1745316747558; Tue, 22 Apr 2025 03:12:27 -0700 (PDT) Date: Tue, 22 Apr 2025 03:12:27 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68076b8b.050a0220.380c13.0088.GAE@google.com> Subject: [syzbot] [net?] [bpf?] KASAN: slab-use-after-free Read in sk_psock_verdict_data_ready (3) From: syzbot To: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, edumazet@google.com, horms@kernel.org, jakub@cloudflare.com, john.fastabend@gmail.com, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 8582d9ab3efd libbpf: Verify section type in btf_find_elf_s.. git tree: bpf-next console output: https://syzkaller.appspot.com/x/log.txt?x=13baba3f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=3b209dc5439043d2 dashboard link: https://syzkaller.appspot.com/bug?extid=c21c23281290bfafe8d5 compiler: Debian clang version 15.0.6, Debian LLD 15.0.6 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ee77ac023e33/disk-8582d9ab.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ebe52a30453e/vmlinux-8582d9ab.xz kernel image: https://storage.googleapis.com/syzbot-assets/6868f9db2e2e/bzImage-8582d9ab.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c21c23281290bfafe8d5@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in sk_psock_verdict_data_ready+0x6d/0x390 net/core/skmsg.c:1239 Read of size 8 at addr ffff888078595a20 by task syz.2.24/6005 CPU: 0 UID: 0 PID: 6005 Comm: syz.2.24 Not tainted 6.14.0-syzkaller-g8582d9ab3efd #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0x16e/0x5b0 mm/kasan/report.c:521 kasan_report+0x143/0x180 mm/kasan/report.c:634 sk_psock_verdict_data_ready+0x6d/0x390 net/core/skmsg.c:1239 unix_stream_sendmsg+0x7a3/0x1000 net/unix/af_unix.c:2329 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:727 ____sys_sendmsg+0x523/0x860 net/socket.c:2566 ___sys_sendmsg net/socket.c:2620 [inline] __sys_sendmsg+0x271/0x360 net/socket.c:2652 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6d0d98e169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6d0e7fa038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f6d0dbb5fa0 RCX: 00007f6d0d98e169 RDX: 0000000000000003 RSI: 0000200000000980 RDI: 0000000000000007 RBP: 00007f6d0da10a68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f6d0dbb5fa0 R15: 00007ffcf19f37c8 Allocated by task 6005: 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:319 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4151 [inline] slab_alloc_node mm/slub.c:4200 [inline] kmem_cache_alloc_lru_noprof+0x1e5/0x390 mm/slub.c:4219 sock_alloc_inode+0x28/0xc0 net/socket.c:309 alloc_inode+0x69/0x1b0 fs/inode.c:346 new_inode_pseudo include/linux/fs.h:3309 [inline] sock_alloc net/socket.c:622 [inline] __sock_create+0x127/0xa30 net/socket.c:1505 sock_create net/socket.c:1599 [inline] __sys_socketpair+0x34f/0x720 net/socket.c:1750 __do_sys_socketpair net/socket.c:1799 [inline] __se_sys_socketpair net/socket.c:1796 [inline] __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1796 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f 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+0x40/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2389 [inline] slab_free mm/slub.c:4646 [inline] kmem_cache_free+0x197/0x410 mm/slub.c:4748 rcu_do_batch kernel/rcu/tree.c:2568 [inline] rcu_core+0xaac/0x17a0 kernel/rcu/tree.c:2824 handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:579 run_ksoftirqd+0xcf/0x130 kernel/softirq.c:968 smpboot_thread_fn+0x576/0xaa0 kernel/smpboot.c:164 kthread+0x7b7/0x940 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 kasan_record_aux_stack+0xbf/0xd0 mm/kasan/generic.c:548 __call_rcu_common kernel/rcu/tree.c:3082 [inline] call_rcu+0x172/0xad0 kernel/rcu/tree.c:3202 destroy_inode fs/inode.c:401 [inline] evict+0x837/0x9b0 fs/inode.c:834 __dentry_kill+0x20d/0x630 fs/dcache.c:660 dput+0x19f/0x2b0 fs/dcache.c:902 __fput+0x60b/0x9f0 fs/file_table.c:473 task_work_run+0x251/0x310 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x210 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888078595a00 which belongs to the cache sock_inode_cache of size 1408 The buggy address is located 32 bytes inside of freed 1408-byte region [ffff888078595a00, ffff888078595f80) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x78590 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888030557601 anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff8881422b0dc0 0000000000000000 0000000000000001 raw: 0000000000000000 0000000000150015 00000000f5000000 ffff888030557601 head: 00fff00000000040 ffff8881422b0dc0 0000000000000000 0000000000000001 head: 0000000000000000 0000000000150015 00000000f5000000 ffff888030557601 head: 00fff00000000003 ffffea0001e16401 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Reclaimable, gfp_mask 0xd20d0(__GFP_RECLAIMABLE|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5838, tgid 5838 (syz-executor), ts 91567346475, free_ts 30811401561 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1717 prep_new_page mm/page_alloc.c:1725 [inline] get_page_from_freelist+0x352b/0x36c0 mm/page_alloc.c:3652 __alloc_frozen_pages_noprof+0x211/0x5b0 mm/page_alloc.c:4934 alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2459 [inline] allocate_slab+0x8f/0x3a0 mm/slub.c:2623 new_slab mm/slub.c:2676 [inline] ___slab_alloc+0xc3b/0x1500 mm/slub.c:3862 __slab_alloc+0x58/0xa0 mm/slub.c:3952 __slab_alloc_node mm/slub.c:4027 [inline] slab_alloc_node mm/slub.c:4188 [inline] kmem_cache_alloc_lru_noprof+0x274/0x390 mm/slub.c:4219 sock_alloc_inode+0x28/0xc0 net/socket.c:309 alloc_inode+0x69/0x1b0 fs/inode.c:346 new_inode_pseudo include/linux/fs.h:3309 [inline] sock_alloc net/socket.c:622 [inline] __sock_create+0x127/0xa30 net/socket.c:1505 sock_create net/socket.c:1599 [inline] __sys_socket_create net/socket.c:1636 [inline] __sys_socket+0x14d/0x3c0 net/socket.c:1683 __do_sys_socket net/socket.c:1697 [inline] __se_sys_socket net/socket.c:1695 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1695 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1262 [inline] __free_frozen_pages+0xde8/0x10a0 mm/page_alloc.c:2680 __free_pages mm/page_alloc.c:5044 [inline] free_contig_range+0x154/0x430 mm/page_alloc.c:6900 destroy_args+0x94/0x4b0 mm/debug_vm_pgtable.c:1017 debug_vm_pgtable+0x555/0x590 mm/debug_vm_pgtable.c:1397 do_one_initcall+0x24a/0x940 init/main.c:1257 do_initcall_level+0x157/0x210 init/main.c:1319 do_initcalls+0x71/0xd0 init/main.c:1335 kernel_init_freeable+0x432/0x5d0 init/main.c:1567 kernel_init+0x1d/0x2b0 init/main.c:1457 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff888078595900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888078595980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888078595a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888078595a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888078595b00: 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 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