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| author |   Florian Westphal <fw@strlen.de> | 2021-12-14 15:16:02 -0800 |
|---|---|---|
| committer |   Jakub Kicinski <kuba@kernel.org> | 2021-12-14 18:49:39 -0800 |
| commit | d6692b3b97bdc165d150f4c1505751a323a80717 (patch) | |
| tree | 03b22daae259a1058a4d1ba03b05eb9346f208ea /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | mptcp: remove tcp ulp setsockopt support (diff) | |
| download | linux-dev-d6692b3b97bdc165d150f4c1505751a323a80717.tar.xz linux-dev-d6692b3b97bdc165d150f4c1505751a323a80717.zip | |
mptcp: clear 'kern' flag from fallback sockets
The mptcp ULP extension relies on sk->sk_sock_kern being set correctly:
It prevents setsockopt(fd, IPPROTO_TCP, TCP_ULP, "mptcp", 6); from
working for plain tcp sockets (any userspace-exposed socket).
But in case of fallback, accept() can return a plain tcp sk.
In such case, sk is still tagged as 'kernel' and setsockopt will work.
This will crash the kernel, The subflow extension has a NULL ctx->conn
mptcp socket:
BUG: KASAN: null-ptr-deref in subflow_data_ready+0x181/0x2b0
Call Trace:
tcp_data_ready+0xf8/0x370
[..]
Fixes: cf7da0d66cc1 ("mptcp: Create SUBFLOW socket for incoming connections")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions