[rds-devel] [PATCH v2 net 0/5] tcp/rds: Fix use-after-free around kernel TCP reqsk.

[Kuniyuki Iwashima]

syzkaller reported an warning of netns ref tracker for RDS TCP listener,
which commit 740ea3c4a0b2 ("tcp: Clean up kernel listener's reqsk in
inet_twsk_purge()") partially fixed.

This series fixes the bug in the partial fix, reverts the partial fix,
and fixes the root cause on the RDS side.


Changes:
  v2:
    * Add patch 1, 3, 5
    * Use __sock_create() instead of converting socket
    * Drop Sowmini from CC as it's bounced (patchwork may complain)

  v1: https://lore.kernel.org/netdev/20240223172448.94084-1-kuniyu@amazon.com/


Kuniyuki Iwashima (5):
  tcp: Restart iteration after removing reqsk in inet_twsk_purge().
  Revert "tcp: Clean up kernel listener's reqsk in inet_twsk_purge()"
  net: Convert @kern of __sock_create() to enum.
  rds: tcp: Fix use-after-free of net in reqsk_timer_handler().
  tcp: Add assertion for reqsk->rsk_listener->sk_net_refcnt.

 include/linux/net.h           |  6 ++++++
 net/core/sock.c               |  2 +-
 net/ipv4/inet_timewait_sock.c | 14 +-------------
 net/ipv4/tcp_input.c          |  2 ++
 net/ipv4/tcp_minisocks.c      |  9 ++++-----
 net/rds/tcp_listen.c          |  4 ++--
 net/socket.c                  | 11 ++++++-----
 7 files changed, 22 insertions(+), 26 deletions(-)

-- 
2.30.2