CVE-2022-49209

Summary

In the Linux kernel, the following vulnerability has been resolved:

bpf, sockmap: Fix memleak in tcp_bpf_sendmsg while sk msg is full

If tcp_bpf_sendmsg() is running while sk msg is full. When sk_msg_alloc() returns -ENOMEM error, tcp_bpf_sendmsg() goes to wait_for_memory. If partial memory has been alloced by sk_msg_alloc(), that is, msg_tx->sg.size is greater than osize after sk_msg_alloc(), memleak occurs. To fix we use sk_msg_trim() to release the allocated memory, then goto wait for memory.

Other call paths of sk_msg_alloc() have the similar issue, such as tls_sw_sendmsg(), so handle sk_msg_trim logic inside sk_msg_alloc(), as Cong Wang suggested.

This issue can cause the following info: WARNING: CPU: 3 PID: 7950 at net/core/stream.c:208 sk_stream_kill_queues+0xd4/0x1a0 Call Trace: <TASK> inet_csk_destroy_sock+0x55/0x110 __tcp_close+0x279/0x470 tcp_close+0x1f/0x60 inet_release+0x3f/0x80 __sock_release+0x3d/0xb0 sock_close+0x11/0x20 __fput+0x92/0x250 task_work_run+0x6a/0xa0 do_exit+0x33b/0xb60 do_group_exit+0x2f/0xa0 get_signal+0xb6/0x950 arch_do_signal_or_restart+0xac/0x2a0 exit_to_user_mode_prepare+0xa9/0x200 syscall_exit_to_user_mode+0x12/0x30 do_syscall_64+0x46/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae </TASK>

WARNING: CPU: 3 PID: 2094 at net/ipv4/af_inet.c:155 inet_sock_destruct+0x13c/0x260 Call Trace: <TASK> __sk_destruct+0x24/0x1f0 sk_psock_destroy+0x19b/0x1c0 process_one_work+0x1b3/0x3c0 kthread+0xe6/0x110 ret_from_fork+0x22/0x30 </TASK>

Affected Software

VendorProductVersion RangeStatus
LinuxLinux604326b41a6fb9b4a78b6179335decee0365cd8c < 6d03722c34d9603df325f67c6d30dc1b7b3c6067affected
LinuxLinux604326b41a6fb9b4a78b6179335decee0365cd8c < bec34a91eba3483e1830c02bdd36f8f968642047affected
LinuxLinux604326b41a6fb9b4a78b6179335decee0365cd8c < de3a8d8fab0710186f7864ec812836d8d70da3c9affected
LinuxLinux604326b41a6fb9b4a78b6179335decee0365cd8c < f677328f05f52d535cbdc15cb04476db49477eb4affected
LinuxLinux604326b41a6fb9b4a78b6179335decee0365cd8c < d0b85dfc6f01d26808e2576c6537c131b590e270affected
LinuxLinux604326b41a6fb9b4a78b6179335decee0365cd8c < 9c34e38c4a870eb30b13f42f5b44f42e9d19ccb8affected
LinuxLinux4.20affected
LinuxLinux0 < 4.20unaffected
LinuxLinux5.4.189 <= 5.4.*unaffected
LinuxLinux5.10.110 <= 5.10.*unaffected
LinuxLinux5.15.33 <= 5.15.*unaffected
LinuxLinux5.16.19 <= 5.16.*unaffected
LinuxLinux5.17.2 <= 5.17.*unaffected
LinuxLinux5.18 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References