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  1. May 01, 2012
  3. Apr 30, 2012
  5. Apr 28, 2012
    • Neil Horman's avatar
      drop_monitor: Make updating data->skb smp safe · 3885ca78
      Neil Horman authored 
      

Eric Dumazet pointed out to me that the drop_monitor protocol has some holes in
its smp protections.  Specifically, its possible to replace data->skb while its
being written.  This patch corrects that by making data->skb an rcu protected
variable.  That will prevent it from being overwritten while a tracepoint is
modifying it.

Signed-off-by: default avatarNeil Horman <nhorman@tuxdriver.com>
Reported-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
CC: David Miller <davem@davemloft.net>
Acked-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      3885ca78
    • Neil Horman's avatar
      drop_monitor: fix sleeping in invalid context warning · cde2e9a6
      Neil Horman authored 
      

Eric Dumazet pointed out this warning in the drop_monitor protocol to me:

[   38.352571] BUG: sleeping function called from invalid context at kernel/mutex.c:85
[   38.352576] in_atomic(): 1, irqs_disabled(): 0, pid: 4415, name: dropwatch
[   38.352580] Pid: 4415, comm: dropwatch Not tainted 3.4.0-rc2+ #71
[   38.352582] Call Trace:
[   38.352592]  [<ffffffff8153aaf0>] ? trace_napi_poll_hit+0xd0/0xd0
[   38.352599]  [<ffffffff81063f2a>] __might_sleep+0xca/0xf0
[   38.352606]  [<ffffffff81655b16>] mutex_lock+0x26/0x50
[   38.352610]  [<ffffffff8153aaf0>] ? trace_napi_poll_hit+0xd0/0xd0
[   38.352616]  [<ffffffff810b72d9>] tracepoint_probe_register+0x29/0x90
[   38.352621]  [<ffffffff8153a585>] set_all_monitor_traces+0x105/0x170
[   38.352625]  [<ffffffff8153a8ca>] net_dm_cmd_trace+0x2a/0x40
[   38.352630]  [<ffffffff8154a81a>] genl_rcv_msg+0x21a/0x2b0
[   38.352636]  [<ffffffff810f8029>] ? zone_statistics+0x99/0xc0
[   38.352640]  [<ffffffff8154a600>] ? genl_rcv+0x30/0x30
[   38.352645]  [<ffffffff8154a059>] netlink_rcv_skb+0xa9/0xd0
[   38.352649]  [<ffffffff8154a5f0>] genl_rcv+0x20/0x30
[   38.352653]  [<ffffffff81549a7e>] netlink_unicast+0x1ae/0x1f0
[   38.352658]  [<ffffffff81549d76>] netlink_sendmsg+0x2b6/0x310
[   38.352663]  [<ffffffff8150824f>] sock_sendmsg+0x10f/0x130
[   38.352668]  [<ffffffff8150abe0>] ? move_addr_to_kernel+0x60/0xb0
[   38.352673]  [<ffffffff81515f04>] ? verify_iovec+0x64/0xe0
[   38.352677]  [<ffffffff81509c46>] __sys_sendmsg+0x386/0x390
[   38.352682]  [<ffffffff810ffaf9>] ? handle_mm_fault+0x139/0x210
[   38.352687]  [<ffffffff8165b5bc>] ? do_page_fault+0x1ec/0x4f0
[   38.352693]  [<ffffffff8106ba4d>] ? set_next_entity+0x9d/0xb0
[   38.352699]  [<ffffffff81310b49>] ? tty_ldisc_deref+0x9/0x10
[   38.352703]  [<ffffffff8106d363>] ? pick_next_task_fair+0x63/0x140
[   38.352708]  [<ffffffff8150b8d4>] sys_sendmsg+0x44/0x80
[   38.352713]  [<ffffffff8165f8e2>] system_call_fastpath+0x16/0x1b

It stems from holding a spinlock (trace_state_lock) while attempting to register
or unregister tracepoint hooks, making in_atomic() true in this context, leading
to the warning when the tracepoint calls might_sleep() while its taking a mutex.
Since we only use the trace_state_lock to prevent trace protocol state races, as
well as hardware stat list updates on an rcu write side, we can just convert the
spinlock to a mutex to avoid this problem.

Signed-off-by: default avatarNeil Horman <nhorman@tuxdriver.com>
Reported-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
CC: David Miller <davem@davemloft.net>
Acked-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      cde2e9a6
    • Neal Cardwell's avatar
      tcp: clean up use of jiffies in tcp_rcv_rtt_measure() · 651913ce
      Neal Cardwell authored 
      

Clean up a reference to jiffies in tcp_rcv_rtt_measure() that should
instead reference tcp_time_stamp. Since the result of the subtraction
is passed into a function taking u32, this should not change any
behavior (and indeed the generated assembly does not change on
x86_64). However, it seems worth cleaning this up for consistency and
clarity (and perhaps to avoid bugs if this is copied and pasted
somewhere else).

Signed-off-by: default avatarNeal Cardwell <ncardwell@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      651913ce
  7. Apr 27, 2012
  9. Apr 26, 2012