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Date: Sat, 27 Aug 2022 16:09:24 +0800 From: Jiacheng Xu <578001344xu@...il.com> To: borisp@...dia.com, john.fastabend@...il.com, linux-kernel@...r.kernel.org Cc: netdev@...r.kernel.org, yin31149@...il.com Subject: refcount bug in bpf_exec_tx_verdict Hello, When using modified Syzkaller to fuzz the Linux kernel-5.19, the following crash was triggered. HEAD commit: 3d7cb6b04c3f Linux-5.19 git tree: upstream console output: https://drive.google.com/file/d/1Sdr1eSqR2fQ187gdAIn568-JBiUTgoOL/view?usp=sharing kernel config: https://drive.google.com/file/d/1wgIUDwP5ho29AM-K7HhysSTfWFpfXYkG/view?usp=sharing syz repro: https://drive.google.com/file/d/1bP0dDQfHG4yy59rHjxQxfjnDiIjXfbBU/view?usp=sharing C reproducer: https://drive.google.com/file/d/1yB50TqEIAAZibpU9G_c3ryvCCnGsBRir/view?usp=sharing Environment: Ubuntu 20.04 on Linux 5.4.0 QEMU 4.2.1: qemu-system-x86_64 \ -m 2G \ -smp 2 \ -kernel /home/workdir/bzImage \ -append "console=ttyS0 root=/dev/sda earlyprintk=serial net.ifnames=0" \ -drive file=/home/workdir/stretch.img,format=raw \ -net user,host=10.0.2.10,hostfwd=tcp:127.0.0.1:10021-:22 \ -net nic,model=e1000 \ -enable-kvm \ -nographic \ -pidfile vm.pid \ 2>&1 | tee vm.log It seems there is a similar problem(https://lore.kernel.org/bpf/20220804082913.5dac303c@kernel.org/) and patch. Is the patch applied on Linux-5.19.4? I can still trigger the bug on both 5.19 and 5.19.4. If you fix this issue, please add the following tag to the commit: Reported-by Jiacheng Xu<578001344xu@...il.com>, ----------------------------------- refcount_t: saturated; leaking memory. WARNING: CPU: 2 PID: 7393 at lib/refcount.c:19 refcount_warn_saturate+0xf4/0x1e0 lib/refcount.c:19 Modules linked in: CPU: 2 PID: 7393 Comm: syz-executor Not tainted 5.19.0 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:refcount_warn_saturate+0xf4/0x1e0 lib/refcount.c:19 Code: 1d e2 87 9d 09 31 ff 89 de e8 58 32 72 fd 84 db 75 ab e8 2f 31 72 fd 48 c7 c7 e0 34 28 8a c6 05 c2 87 9d 09 01 e8 63 7d 2d 05 <0f> 0b eb 8f e8 13 31 72 fd 0f b6 1d ac 87 9d 09 31 ff 89 de e8 23 RSP: 0018:ffffc9000856f5c0 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffffc90002949000 RSI: ffff888023841d80 RDI: fffff520010adeaa RBP: 0000000000000000 R08: ffffffff81619cd8 R09: 0000000000000000 R10: 0000000000000005 R11: ffffed100c7a4f25 R12: ffff8880259e82b8 R13: 0000000000000000 R14: 00000000912d1630 R15: ffff888014780000 FS: 00007f5a2d44f700(0000) GS:ffff888063d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5a2c30e010 CR3: 000000002555f000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __refcount_add_not_zero include/linux/refcount.h:163 [inline] __refcount_inc_not_zero include/linux/refcount.h:227 [inline] refcount_inc_not_zero include/linux/refcount.h:245 [inline] sk_psock_get include/linux/skmsg.h:439 [inline] bpf_exec_tx_verdict+0x1066/0x14d0 net/tls/tls_sw.c:809 tls_sw_sendmsg+0xe53/0x1740 net/tls/tls_sw.c:1023 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:729 sock_write_iter+0x284/0x3c0 net/socket.c:1108 call_write_iter include/linux/fs.h:2058 [inline] new_sync_write+0x393/0x570 fs/read_write.c:504 vfs_write+0x7c4/0xab0 fs/read_write.c:591 ksys_write+0x1e8/0x250 fs/read_write.c:644 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f5a2c295dfd Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5a2d44ec58 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f5a2c3bc0a0 RCX: 00007f5a2c295dfd RDX: 000000000000fdef RSI: 0000000020000100 RDI: 0000000000000003 RBP: 00007f5a2c2ff4c1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5a2c3bc0a0 R13: 00007ffce006e15f R14: 00007ffce006e300 R15: 00007f5a2d44edc0 </TASK>
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