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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Thu, 2 Dec 2010 12:44:51 +0000 (UTC)
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Subject: cvs commit: src/sys/fs/procfs procfs_fpregs.c procfs_regs.c
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kib         2010-12-02 12:44:51 UTC

  FreeBSD src repository

  Modified files:
    sys/fs/procfs        procfs_fpregs.c procfs_regs.c 
  Log:
  SVN rev 216120 on 2010-12-02 12:44:51Z by kib
  
  For non-stopped threads, td_frame pointer is undefined.  As a
  consequence, fill_regs() and fill_fpregs() access random data, usually
  on the thread kernel stack. Most often the td_frame points to the
  previous frame saved by last kernel entry sequence, but this is not
  guaranteed.
  
  For /proc/<pid>/{regs,fpregs} read access, require the thread to be in
  stopped state. Otherwise, return EBUSY as is done for write case.
  
  Reported and tested by: pho
  Approved by:    des (procfs maintainer)
  MFC after:      1 week
  
  Revision  Changes    Path
  1.36      +4 -0      src/sys/fs/procfs/procfs_fpregs.c
  1.35      +4 -0      src/sys/fs/procfs/procfs_regs.c