CVE: CVE-2025-38166
Published: 2025-07-03
Description: In the Linux kernel, the following vulnerability has been resolved:

bpf: fix ktls panic with sockmap

[ 2172.936997] ------------[ cut here ]------------
[ 2172.936999] kernel BUG at lib/iov_iter.c:629!
......
[ 2172.944996] PKRU: 55555554
[ 2172.945155] Call Trace:
[ 2172.945299]  <TASK>
[ 2172.945428]  ? die+0x36/0x90
[ 2172.945601]  ? do_trap+0xdd/0x100
[ 2172.945795]  ? iov_iter_revert+0x178/0x180
[ 2172.946031]  ? iov_iter_revert+0x178/0x180
[ 2172.946267]  ? do_error_trap+0x7d/0x110
[ 2172.946499]  ? iov_iter_revert+0x178/0x180
[ 2172.946736]  ? exc_invalid_op+0x50/0x70
[ 2172.946961]  ? iov_iter_revert+0x178/0x180
[ 2172.947197]  ? asm_exc_invalid_op+0x1a/0x20
[ 2172.947446]  ? iov_iter_revert+0x178/0x180
[ 2172.947683]  ? iov_iter_revert+0x5c/0x180
[ 2172.947913]  tls_sw_sendmsg_locked.isra.0+0x794/0x840
[ 2172.948206]  tls_sw_sendmsg+0x52/0x80
[ 2172.948420]  ? inet_sendmsg+0x1f/0x70
[ 2172.948634]  __sys_sendto+0x1cd/0x200
[ 2172.948848]  ? find_held_lock+0x2b/0x80
[ 2172.949072]  ? syscall_trace_enter+0x140/0x270
[ 2172.949330]  ? __lock_release.isra.0+0x5e/0x170
[ 2172.949595]  ? find_held_lock+0x2b/0x80
[ 2172.949817]  ? syscall_trace_enter+0x140/0x270
[ 2172.950211]  ? lockdep_hardirqs_on_prepare+0xda/0x190
[ 2172.950632]  ? ktime_get_coarse_real_ts64+0xc2/0xd0
[ 2172.951036]  __x64_sys_sendto+0x24/0x30
[ 2172.951382]  do_syscall_64+0x90/0x170
......

After calling bpf_exec_tx_verdict(), the size of msg_pl->sg may increase,
e.g., when the BPF program executes bpf_msg_push_data().

If the BPF program sets cork_bytes and sg.size is smaller than cork_bytes,
it will return -ENOSPC and attempt to roll back to the non-zero copy
logic. However, during rollback, msg->msg_iter is reset, but since
msg_pl->sg.size has been increased, subsequent executions will exceed the
actual size of msg_iter.
'''
iov_iter_revert(&msg->msg_iter, msg_pl->sg.size - orig_size);
'''

The changes in this commit are based on the following considerations:

1. When cork_bytes is set, rolling back to non-zero copy logic is
pointless and can directly go to zero-copy logic.

2. We can not calculate the correct number of bytes to revert msg_iter.

Assume the original data is "abcdefgh" (8 bytes), and after 3 pushes
by the BPF program, it becomes 11-byte data: "abc?de?fgh?".
Then, we set cork_bytes to 6, which means the first 6 bytes have been
processed, and the remaining 5 bytes "?fgh?" will be cached until the
length meets the cork_bytes requirement.

However, some data in "?fgh?" is not within 'sg->msg_iter'
(but in msg_pl instead), especially the data "?" we pushed.

So it doesn't seem as simple as just reverting through an offset of
msg_iter.

3. For non-TLS sockets in tcp_bpf_sendmsg, when a "cork" situation occurs,
the user-space send() doesn't return an error, and the returned length is
the same as the input length parameter, even if some data is cached.

Additionally, I saw that the current non-zero-copy logic for handling
corking is written as:
'''
line 1177
else if (ret != -EAGAIN) {
	if (ret == -ENOSPC)
		ret = 0;
	goto send_end;
'''

So it's ok to just return 'copied' without error when a "cork" situation
occurs.
CVSS Score: 5.5 (MEDIUM)
References: https://git.kernel.org/stable/c/2e36a81d388ec9c3f78b6223f7eda2088cd40adb; https://git.kernel.org/stable/c/328cac3f9f8ae394748485e769a527518a9137c8; https://git.kernel.org/stable/c/54a3ecaeeeae8176da8badbd7d72af1017032c39