CVE-2025-38166

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.