CVE-2023-53133

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> bpf, sockmap: Fix an infinite loop error when len is 0 in tcp_bpf_recvmsg_parser()<br /> <br /> When the buffer length of the recvmsg system call is 0, we got the<br /> flollowing soft lockup problem:<br /> <br /> watchdog: BUG: soft lockup - CPU#3 stuck for 27s! [a.out:6149]<br /> CPU: 3 PID: 6149 Comm: a.out Kdump: loaded Not tainted 6.2.0+ #30<br /> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014<br /> RIP: 0010:remove_wait_queue+0xb/0xc0<br /> Code: 5e 41 5f c3 cc cc cc cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 0f 1f 44 00 00 41 57 56 41 55 41 54 55 48 89 fd 53 48 89 f3 4c 8d 6b 18 4c 8d 73 20<br /> RSP: 0018:ffff88811b5978b8 EFLAGS: 00000246<br /> RAX: 0000000000000000 RBX: ffff88811a7d3780 RCX: ffffffffb7a4d768<br /> RDX: dffffc0000000000 RSI: ffff88811b597908 RDI: ffff888115408040<br /> RBP: 1ffff110236b2f1b R08: 0000000000000000 R09: ffff88811a7d37e7<br /> R10: ffffed10234fa6fc R11: 0000000000000001 R12: ffff88811179b800<br /> R13: 0000000000000001 R14: ffff88811a7d38a8 R15: ffff88811a7d37e0<br /> FS: 00007f6fb5398740(0000) GS:ffff888237180000(0000) knlGS:0000000000000000<br /> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033<br /> CR2: 0000000020000000 CR3: 000000010b6ba002 CR4: 0000000000370ee0<br /> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000<br /> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400<br /> Call Trace:<br /> <br /> tcp_msg_wait_data+0x279/0x2f0<br /> tcp_bpf_recvmsg_parser+0x3c6/0x490<br /> inet_recvmsg+0x280/0x290<br /> sock_recvmsg+0xfc/0x120<br /> ____sys_recvmsg+0x160/0x3d0<br /> ___sys_recvmsg+0xf0/0x180<br /> __sys_recvmsg+0xea/0x1a0<br /> do_syscall_64+0x3f/0x90<br /> entry_SYSCALL_64_after_hwframe+0x72/0xdc<br /> <br /> The logic in tcp_bpf_recvmsg_parser is as follows:<br /> <br /> msg_bytes_ready:<br /> copied = sk_msg_recvmsg(sk, psock, msg, len, flags);<br /> if (!copied) {<br /> wait data;<br /> goto msg_bytes_ready;<br /> }<br /> <br /> In this case, "copied" always is 0, the infinite loop occurs.<br /> <br /> According to the Linux system call man page, 0 should be returned in this<br /> case. Therefore, in tcp_bpf_recvmsg_parser(), if the length is 0, directly<br /> return. Also modify several other functions with the same problem.