• David Howells's avatar
    SELinux: Fix RCU deref check warning in sel_netport_insert() · 50345f1e
    David Howells authored
    Fix the following bug in sel_netport_insert() where rcu_dereference() should
    be rcu_dereference_protected() as sel_netport_lock is held.
    
    ===================================================
    [ INFO: suspicious rcu_dereference_check() usage. ]
    ---------------------------------------------------
    security/selinux/netport.c:127 invoked rcu_dereference_check() without protection!
    
    other info that might help us debug this:
    
    rcu_scheduler_active = 1, debug_locks = 0
    1 lock held by ossec-rootcheck/3323:
     #0:  (sel_netport_lock){+.....}, at: [<ffffffff8117d775>] sel_netport_sid+0xbb/0x226
    
    stack backtrace:
    Pid: 3323, comm: ossec-rootcheck Not tainted 3.1.0-rc8-fsdevel+ #1095
    Call Trace:
     [<ffffffff8105cfb7>] lockdep_rcu_dereference+0xa7/0xb0
     [<ffffffff8117d871>] sel_netport_sid+0x1b7/0x226
     [<ffffffff8117d6ba>] ? sel_netport_avc_callback+0xbc/0xbc
     [<ffffffff8117556c>] selinux_socket_bind+0x115/0x230
     [<ffffffff810a5388>] ? might_fault+0x4e/0x9e
     [<ffffffff810a53d1>] ? might_fault+0x97/0x9e
     [<ffffffff81171cf4>] security_socket_bind+0x11/0x13
     [<ffffffff812ba967>] sys_bind+0x56/0x95
     [<ffffffff81380dac>] ? sysret_check+0x27/0x62
     [<ffffffff8105b767>] ? trace_hardirqs_on_caller+0x11e/0x155
     [<ffffffff81076fcd>] ? audit_syscall_entry+0x17b/0x1ae
     [<ffffffff811b5eae>] ? trace_hardirqs_on_thunk+0x3a/0x3f
     [<ffffffff81380d7b>] system_call_fastpath+0x16/0x1b
    Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
    Acked-by: default avatarPaul Moore <paul@paul-moore.com>
    Acked-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
    Cc: stable@kernel.org
    Signed-off-by: default avatarJames Morris <jmorris@namei.org>
    50345f1e
netport.c 6.73 KB