Merge branch 'bpf-fix-ktls-panic-with-sockmap-and-add-tests'

Merge branch 'bpf-fix-ktls-panic-with-sockmap-and-add-tests'

Jiayuan Chen says:

====================
bpf: fix ktls panic with sockmap and add tests

We can reproduce the issue using the existing test program:
'./test_sockmap --ktls'
Or use the selftest I provided, which will cause a panic:

------------[ cut here ]------------
kernel BUG at lib/iov_iter.c:629!

PKRU: 55555554
Call Trace:
 <TASK>
 ? die+0x36/0x90
 ? do_trap+0xdd/0x100
 ? iov_iter_revert+0x178/0x180
 ? iov_iter_revert+0x178/0x180
 ? do_error_trap+0x7d/0x110
 ? iov_iter_revert+0x178/0x180
 ? exc_invalid_op+0x50/0x70
 ? iov_iter_revert+0x178/0x180
 ? asm_exc_invalid_op+0x1a/0x20
 ? iov_iter_revert+0x178/0x180
 ? iov_iter_revert+0x5c/0x180
 tls_sw_sendmsg_locked.isra.0+0x794/0x840
 tls_sw_sendmsg+0x52/0x80
 ? inet_sendmsg+0x1f/0x70
 __sys_sendto+0x1cd/0x200
 ? find_held_lock+0x2b/0x80
 ? syscall_trace_enter+0x140/0x270
 ? __lock_release.isra.0+0x5e/0x170
 ? find_held_lock+0x2b/0x80
 ? syscall_trace_enter+0x140/0x270
 ? lockdep_hardirqs_on_prepare+0xda/0x190
 ? ktime_get_coarse_real_ts64+0xc2/0xd0
 __x64_sys_sendto+0x24/0x30
 do_syscall_64+0x90/0x170

1. It looks like the issue started occurring after bpf being introduced to
ktls and later the addition of assertions to iov_iter has caused a panic.
If my fix tag is incorrect, please assist me in correcting the fix tag.

2. I make minimal changes for now, it's enough to make ktls work
correctly.
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v1->v2: Added more content to the commit message
https://lore.kernel.org/all/20250123171552.57345-1-mrpre@163.com/#r
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====================

Link: https://patch.msgid.link/20250219052015.274405-1-jiayuan.chen@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>