)]}'
{
  "commit": "33e0d57f5d2f079104611be9f3fccc27ef2c6b24",
  "tree": "8903edabbf327e9244f8751eff179f967344c27d",
  "parents": [
    "864ee6cb22fd64c1f4fba8ea3f390ffd8816b563"
  ],
  "author": {
    "name": "Linus Torvalds",
    "email": "torvalds@linux-foundation.org",
    "time": "Fri Nov 19 11:54:40 2010 -0800"
  },
  "committer": {
    "name": "Linus Torvalds",
    "email": "torvalds@linux-foundation.org",
    "time": "Fri Nov 19 11:54:40 2010 -0800"
  },
  "message": "Revert \"kernel: make /proc/kallsyms mode 400 to reduce ease of attacking\"\n\nThis reverts commit 59365d136d205cc20fe666ca7f89b1c5001b0d5a.\n\nIt turns out that this can break certain existing user land setups.\nQuoth Sarah Sharp:\n\n \"On Wednesday, I updated my branch to commit 460781b from linus\u0027 tree,\n  and my box would not boot.  klogd segfaulted, which stalled the whole\n  system.\n\n  At first I thought it actually hung the box, but it continued booting\n  after 5 minutes, and I was able to log in.  It dropped back to the\n  text console instead of the graphical bootup display for that period\n  of time.  dmesg surprisingly still works.  I\u0027ve bisected the problem\n  down to this commit (commit 59365d136d205cc20fe666ca7f89b1c5001b0d5a)\n\n  The box is running klogd 1.5.5ubuntu3 (from Jaunty).  Yes, I know\n  that\u0027s old.  I read the bit in the commit about changing the\n  permissions of kallsyms after boot, but if I can\u0027t boot that doesn\u0027t\n  help.\"\n\nSo let\u0027s just keep the old default, and encourage distributions to do\nthe \"chmod -r /proc/kallsyms\" in their bootup scripts.  This is not\nworth a kernel option to change default behavior, since it\u0027s so easily\ndone in user space.\n\nReported-and-bisected-by: Sarah Sharp \u003csarah.a.sharp@linux.intel.com\u003e\nCc: Marcus Meissner \u003cmeissner@suse.de\u003e\nCc: Tejun Heo \u003ctj@kernel.org\u003e\nCc: Eugene Teo \u003ceugeneteo@kernel.org\u003e\nCc: Jesper Juhl \u003cjj@chaosbits.net\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n",
  "tree_diff": [
    {
      "type": "modify",
      "old_id": "a8db2570f99a9cb094daa2e773fc74e6e23d25bb",
      "old_mode": 33188,
      "old_path": "kernel/kallsyms.c",
      "new_id": "6f6d091b57573bf37fc98fdcb2df91c08787543d",
      "new_mode": 33188,
      "new_path": "kernel/kallsyms.c"
    }
  ]
}