From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f197.google.com (mail-il1-f197.google.com [209.85.166.197]) (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 91C5413AA4D for ; Thu, 4 Apr 2024 21:19:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.197 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712265564; cv=none; b=oSOYswDKOn80vKWSOV8ARabAuHiznkBdaVLLFDoVDdp0bYxQzriLSo7a+Qd/scwCQXFJPR5ga2uyJK3k8d1Na4gzTp7LS9qty/Y5SRViZ6MWjD5NJQ1sN4J7WV1ba+YZnIJahDlHbR9IQEaXEvyExktm9eFhcqBglO9/9xz3P38= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712265564; c=relaxed/simple; bh=4gFKZJsZkOva5xsvIHI7fyp7h0DEuI0hQrqWNykS+24=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=hNpH69O0Y8Int7+vP3svR3wS3S72oUe1UHOPN3P5BXkoRAl73MSNd7g8IxHgYna+BMiu5Wt9z2Dwr83G48YqYOjpWM6k7d9kp2oxqPXwkyzNJn4oraXAgmkCZjvqOmhTEu8B+LQAB+EX1zVk9Tz3KGhq7L1LFus18uYNhJjZ4KQ= 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=209.85.166.197 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-f197.google.com with SMTP id e9e14a558f8ab-369f9e8863dso12379275ab.3 for ; Thu, 04 Apr 2024 14:19:22 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1712265562; x=1712870362; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=lmuL5umgLBhd+rm0dXh3QIj4ggH/x0UfN42sBdpvmi8=; b=tVMU05G2XfpYeUqQDS5KTbRKc2jX3dg0hspvclg/JFRaZDL2hgrTLcN9ZfQB1Fdhpr Yfe4GeM3wal140+2P8GEwbkz0u/cWwpkaEfNKa51Kb+JvCxZjMdl2k12vKAQkuXgPM3z kwMmPOaLqJ3oxV0xur73aj8CWyjWlCoxm8VYMqxkcm3B+6Sz0kHa1glO0rdPXcN9BWCr UDjuDfrwjf6Lax6T2ulAZcKsIdSY0eivG1DXizzUjaHBgUuuFIABotBbuwOOraAYin4s 0T1nvBPuXxjxt0Kim/QN75Fg+RnF4JjgYi5d1KW+FYR7ZIKphhPx7PjVGbOPneQPcFw/ pLOg== X-Forwarded-Encrypted: i=1; AJvYcCWASoUhwmbU6rsZGB7F33zZG6Oeo24ezcmyjx9S1qrENa8ecmAz2FSn51X9qPVKfzlSQodGgVbHE8es9Mcx7Uos1XbiCofCo8sfGlOW X-Gm-Message-State: AOJu0YyseIuTVmfM7bJDNKRsgXj+LSMTws3wbaCQHfWOt4P3ssocGC3P soKTihuDMAFIamSPMMRaLpwPq5DoyYmP+0mEB4Kzuq6bmc5hd05R3RQAxBFxH3zWSMhsdnPSUpq k/52piDU/D6jbB3kWeHR6CCfYcrEjnhkgos9vLJiXVt/KOnZ7aVfszQw= X-Google-Smtp-Source: AGHT+IFpWi12crOHRPanJuUOTFP7XpK1ck2Kei6mG934s1CzWQFVtEGzAkuCCdpWGi8AsF58g8s4w5KmXmAJ46DlEo3LlAXWndnF Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:368b:b0:369:f7ca:a358 with SMTP id cj11-20020a056e02368b00b00369f7caa358mr31937ilb.0.1712265561814; Thu, 04 Apr 2024 14:19:21 -0700 (PDT) Date: Thu, 04 Apr 2024 14:19:21 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000092c8da06154be4f5@google.com> Subject: [syzbot] [bpf?] KASAN: slab-use-after-free Read in bpf_link_free From: syzbot To: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, eddyz87@gmail.com, haoluo@google.com, john.fastabend@gmail.com, jolsa@kernel.org, kpsingh@kernel.org, linux-kernel@vger.kernel.org, martin.lau@linux.dev, sdf@google.com, song@kernel.org, syzkaller-bugs@googlegroups.com, yonghong.song@linux.dev Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 727900b675b7 Add linux-next specific files for 20240403 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=17bf53c5180000 kernel config: https://syzkaller.appspot.com/x/.config?x=afcaf46d374cec8c dashboard link: https://syzkaller.appspot.com/bug?extid=b3851d693eb8edda5c7d compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f8fb4daa7a83/disk-727900b6.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d2a6994aee53/vmlinux-727900b6.xz kernel image: https://storage.googleapis.com/syzbot-assets/6759e5411c39/bzImage-727900b6.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b3851d693eb8edda5c7d@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in bpf_link_free+0x234/0x2d0 kernel/bpf/syscall.c:3065 Read of size 8 at addr ffff88802e688c10 by task syz-executor.3/5206 CPU: 0 PID: 5206 Comm: syz-executor.3 Not tainted 6.9.0-rc2-next-20240403-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 bpf_link_free+0x234/0x2d0 kernel/bpf/syscall.c:3065 bpf_link_put_direct kernel/bpf/syscall.c:3093 [inline] bpf_link_release+0x7b/0x90 kernel/bpf/syscall.c:3100 __fput+0x429/0x8a0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa1b/0x27e0 kernel/exit.c:878 do_group_exit+0x207/0x2c0 kernel/exit.c:1027 get_signal+0x16a1/0x1740 kernel/signal.c:2911 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xc9/0x360 kernel/entry/common.c:218 do_syscall_64+0x10a/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x72/0x7a RIP: 0033:0x7f803547dde9 Code: Unable to access opcode bytes at 0x7f803547ddbf. RSP: 002b:00007f80361c80c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: 0000000000000006 RBX: 00007f80355abf80 RCX: 00007f803547dde9 RDX: 0000000000000010 RSI: 0000000020000040 RDI: 0000000000000011 RBP: 00007f80354ca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f80355abf80 R15: 00007fff8c6d4fc8 Allocated by task 5206: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace_noprof+0x19c/0x2b0 mm/slub.c:4100 kmalloc_noprof include/linux/slab.h:660 [inline] kzalloc_noprof include/linux/slab.h:775 [inline] bpf_raw_tp_link_attach+0x2a0/0x6e0 kernel/bpf/syscall.c:3845 bpf_raw_tracepoint_open+0x1c2/0x240 kernel/bpf/syscall.c:3892 __sys_bpf+0x3c0/0x810 kernel/bpf/syscall.c:5702 __do_sys_bpf kernel/bpf/syscall.c:5767 [inline] __se_sys_bpf kernel/bpf/syscall.c:5765 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5765 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x72/0x7a Freed by task 24: 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:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2180 [inline] slab_free mm/slub.c:4384 [inline] kfree+0x149/0x350 mm/slub.c:4505 rcu_do_batch kernel/rcu/tree.c:2559 [inline] rcu_core+0xafd/0x1830 kernel/rcu/tree.c:2833 __do_softirq+0x2c6/0x980 kernel/softirq.c:554 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541 __call_rcu_common kernel/rcu/tree.c:3096 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:3200 bpf_link_free+0x1f8/0x2d0 kernel/bpf/syscall.c:3063 bpf_link_put_direct kernel/bpf/syscall.c:3093 [inline] bpf_link_release+0x7b/0x90 kernel/bpf/syscall.c:3100 __fput+0x429/0x8a0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa1b/0x27e0 kernel/exit.c:878 do_group_exit+0x207/0x2c0 kernel/exit.c:1027 get_signal+0x16a1/0x1740 kernel/signal.c:2911 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xc9/0x360 kernel/entry/common.c:218 do_syscall_64+0x10a/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x72/0x7a The buggy address belongs to the object at ffff88802e688c00 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 16 bytes inside of freed 128-byte region [ffff88802e688c00, ffff88802e688c80) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2e688 flags: 0xfff80000000000(node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffefff(slab) raw: 00fff80000000000 ffff8880150418c0 ffffea0000b40100 dead000000000002 raw: 0000000000000000 0000000000100010 00000001ffffefff 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 4551, tgid 587604050 (udevadm), ts 4551, free_ts 25547020786 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1490 prep_new_page mm/page_alloc.c:1498 [inline] get_page_from_freelist+0x2e7e/0x2f40 mm/page_alloc.c:3454 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4712 __alloc_pages_node_noprof include/linux/gfp.h:244 [inline] alloc_pages_node_noprof include/linux/gfp.h:271 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2249 allocate_slab+0x5a/0x2e0 mm/slub.c:2412 new_slab mm/slub.c:2465 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3615 __slab_alloc+0x58/0xa0 mm/slub.c:3705 __slab_alloc_node mm/slub.c:3758 [inline] slab_alloc_node mm/slub.c:3936 [inline] kmalloc_trace_noprof+0x1d5/0x2b0 mm/slub.c:4095 kmalloc_noprof include/linux/slab.h:660 [inline] kzalloc_noprof include/linux/slab.h:775 [inline] kernfs_get_open_node fs/kernfs/file.c:525 [inline] kernfs_fop_open+0x800/0xcd0 fs/kernfs/file.c:693 do_dentry_open+0x907/0x15a0 fs/open.c:955 do_open fs/namei.c:3642 [inline] path_openat+0x2860/0x3240 fs/namei.c:3799 do_filp_open+0x235/0x490 fs/namei.c:3826 do_sys_openat2+0x13e/0x1d0 fs/open.c:1406 do_sys_open fs/open.c:1421 [inline] __do_sys_openat fs/open.c:1437 [inline] __se_sys_openat fs/open.c:1432 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1432 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x72/0x7a page last free pid 4544 tgid 4544 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1110 [inline] free_unref_page+0xd3c/0xec0 mm/page_alloc.c:2617 discard_slab mm/slub.c:2511 [inline] __put_partials+0xeb/0x130 mm/slub.c:2980 put_cpu_partial+0x17c/0x250 mm/slub.c:3055 __slab_free+0x2ea/0x3d0 mm/slub.c:4254 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3888 [inline] slab_alloc_node mm/slub.c:3948 [inline] kmem_cache_alloc_node_noprof+0x16b/0x310 mm/slub.c:3991 kmalloc_reserve+0xa8/0x2a0 net/core/skbuff.c:577 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:668 netlink_sendmsg+0x637/0xcb0 net/netlink/af_netlink.c:1880 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x72/0x7a Memory state around the buggy address: ffff88802e688b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ffff88802e688b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802e688c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802e688c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802e688d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== --- 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