netdev - [PATCH bpf-next v2 0/2] bpf: fix ktls panic with sockmap and add tests

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Message-ID: <20250219052015.274405-1-jiayuan.chen@linux.dev>
Date: Wed, 19 Feb 2025 13:20:13 +0800
From: Jiayuan Chen <jiayuan.chen@...ux.dev>
To: bpf@...r.kernel.org
Cc: borisp@...dia.com,
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	Jiayuan Chen <jiayuan.chen@...ux.dev>
Subject: [PATCH bpf-next v2 0/2] 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.

---
v1->v2: Added more content to the commit message
https://lore.kernel.org/all/20250123171552.57345-1-mrpre@163.com/#r
---

Jiayuan Chen (2):
  bpf: fix ktls panic with sockmap
  selftests/bpf: add ktls selftest

 net/tls/tls_sw.c                              |   8 +-
 .../selftests/bpf/prog_tests/sockmap_ktls.c   | 174 +++++++++++++++++-
 .../selftests/bpf/progs/test_sockmap_ktls.c   |  26 +++
 3 files changed, 205 insertions(+), 3 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/progs/test_sockmap_ktls.c

-- 
2.47.1