)]}'
{
  "commit": "7bf0aee237176a3edcd054b80dba2dad3e2be7ff",
  "tree": "13ea381ebc701d1c0004ace18980530d48e3c116",
  "parents": [
    "d16beab575e17e46a4b187fb9f8211fab3adfbae"
  ],
  "author": {
    "name": "Thomas Gleixner",
    "email": "tglx@linutronix.de",
    "time": "Mon May 12 20:45:34 2014 +0000"
  },
  "committer": {
    "name": "Greg Kroah-Hartman",
    "email": "gregkh@linuxfoundation.org",
    "time": "Sat Jun 07 16:02:00 2014 -0700"
  },
  "message": "futex: Add another early deadlock detection check\n\ncommit 866293ee54227584ffcb4a42f69c1f365974ba7f upstream.\n\nDave Jones trinity syscall fuzzer exposed an issue in the deadlock\ndetection code of rtmutex:\n  http://lkml.kernel.org/r/20140429151655.GA14277@redhat.com\n\nThat underlying issue has been fixed with a patch to the rtmutex code,\nbut the futex code must not call into rtmutex in that case because\n    - it can detect that issue early\n    - it avoids a different and more complex fixup for backing out\n\nIf the user space variable got manipulated to 0x80000000 which means\nno lock holder, but the waiters bit set and an active pi_state in the\nkernel is found we can figure out the recursive locking issue by\nlooking at the pi_state owner. If that is the current task, then we\ncan safely return -EDEADLK.\n\nThe check should have been added in commit 59fa62451 (futex: Handle\nfutex_pi OWNER_DIED take over correctly) already, but I did not see\nthe above issue caused by user space manipulation back then.\n\nSigned-off-by: Thomas Gleixner \u003ctglx@linutronix.de\u003e\nCc: Dave Jones \u003cdavej@redhat.com\u003e\nCc: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\nCc: Peter Zijlstra \u003cpeterz@infradead.org\u003e\nCc: Darren Hart \u003cdarren@dvhart.com\u003e\nCc: Davidlohr Bueso \u003cdavidlohr@hp.com\u003e\nCc: Steven Rostedt \u003crostedt@goodmis.org\u003e\nCc: Clark Williams \u003cwilliams@redhat.com\u003e\nCc: Paul McKenney \u003cpaulmck@linux.vnet.ibm.com\u003e\nCc: Lai Jiangshan \u003claijs@cn.fujitsu.com\u003e\nCc: Roland McGrath \u003croland@hack.frob.com\u003e\nCc: Carlos ODonell \u003ccarlos@redhat.com\u003e\nCc: Jakub Jelinek \u003cjakub@redhat.com\u003e\nCc: Michael Kerrisk \u003cmtk.manpages@gmail.com\u003e\nCc: Sebastian Andrzej Siewior \u003cbigeasy@linutronix.de\u003e\nLink: http://lkml.kernel.org/r/20140512201701.097349971@linutronix.de\nSigned-off-by: Thomas Gleixner \u003ctglx@linutronix.de\u003e\nSigned-off-by: Greg Kroah-Hartman \u003cgregkh@linuxfoundation.org\u003e\n\n",
  "tree_diff": [
    {
      "type": "modify",
      "old_id": "e564a9a3ea2a761902e15139588cb181878afcfa",
      "old_mode": 33188,
      "old_path": "kernel/futex.c",
      "new_id": "50a02445d0ba03ba44a7acce94ffd7d1187f59a9",
      "new_mode": 33188,
      "new_path": "kernel/futex.c"
    }
  ]
}