git: kernel - Fix SMP race against fp seek position lock

[Matthew Dillon]

commit 9f36effdbdc984a086d7ff25c484665807460d67
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Fri May 29 14:09:37 2015 -0700

    kernel - Fix SMP race against fp seek position lock
    
    * Fix a SMP race against write-appends.  Atomic ops are used on the
      struct file->f_flag field to interlock write-append operations.
      However, the fcntl() and flock() code was also modifying file->f_flag
      using non-atomic ops.
    
    * Fix fcntl() and flock() to use atomic ops.
    
    * Problem could lead to processes stuck forever in "fpoff".
    
    Reported-by: Sevan Janiyan

Summary of changes:
 sys/kern/kern_descrip.c | 18 ++++++++++++++----
 sys/kern/vfs_syscalls.c |  4 ++--
 2 files changed, 16 insertions(+), 6 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/9f36effdbdc984a086d7ff25c484665807460d67


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