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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Fri, 31 Oct 2008 10:38:30 +0000 (UTC)
To: cvs-src-old@freebsd.org
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Subject: cvs commit: src/sys/compat/linux linux_emul.c
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kib         2008-10-31 10:38:30 UTC

  FreeBSD src repository

  Modified files:
    sys/compat/linux     linux_emul.c 
  Log:
  SVN rev 184501 on 2008-10-31 10:38:30Z by kib
  
  The code in linux_proc_exit() contains a race when multiple linux based
  processes exits at the same time.  The linux_emuldata structure is freed
  but p->p_emuldata is left as a dangling pointer to the just freed memory.
  
  The check for W_EXIT in the loop scanning the child processes isn't safe
  since the state of the child process can change right afterwards. Lock
  the process and check the W_EXIT before delivering signal.
  
  Submitted by:   tegge
  Reviewed by:    davidxu
  MFC after:      1 week
  
  Revision  Changes    Path
  1.22      +3 -3      src/sys/compat/linux/linux_emul.c