)]}'
{
  "commit": "38275658d2c28f4d44e3c62690b4fa595f002e46",
  "tree": "ce0a9ef7ea091a6e4c7e69a71384ef412650aea9",
  "parents": [
    "b703b29f5e0de8cf18064348d40f5a5ae83fa9ec"
  ],
  "author": {
    "name": "Kees Cook",
    "email": "keescook@chromium.org",
    "time": "Wed Jan 17 16:40:03 2024 -0800"
  },
  "committer": {
    "name": "Kees Cook",
    "email": "keescook@chromium.org",
    "time": "Mon Jan 22 15:47:04 2024 -0800"
  },
  "message": "virtio: Refactor intentional wrap-around test\n\nIn an effort to separate intentional arithmetic wrap-around from\nunexpected wrap-around, we need to refactor places that depend on this\nkind of math. One of the most common code patterns of this is:\n\n\tVAR + value \u003c VAR\n\nNotably, this is considered \"undefined behavior\" for signed and pointer\ntypes, which the kernel works around by using the -fno-strict-overflow\noption in the build[1] (which used to just be -fwrapv). Regardless, we\nwant to get the kernel source to the position where we can meaningfully\ninstrument arithmetic wrap-around conditions and catch them when they\nare unexpected, regardless of whether they are signed[2], unsigned[3],\nor pointer[4] types.\n\nRefactor open-coded wrap-around addition test to use add_would_overflow().\nThis paves the way to enabling the wrap-around sanitizers in the future.\n\nLink: https://git.kernel.org/linus/68df3755e383e6fecf2354a67b08f92f18536594 [1]\nLink: https://github.com/KSPP/linux/issues/26 [2]\nLink: https://github.com/KSPP/linux/issues/27 [3]\nLink: https://github.com/KSPP/linux/issues/344 [4]\nCc: \"Michael S. Tsirkin\" \u003cmst@redhat.com\u003e\nCc: Jason Wang \u003cjasowang@redhat.com\u003e\nCc: Xuan Zhuo \u003cxuanzhuo@linux.alibaba.com\u003e\nCc: virtualization@lists.linux.dev\nSigned-off-by: Kees Cook \u003ckeescook@chromium.org\u003e\n",
  "tree_diff": [
    {
      "type": "modify",
      "old_id": "0d3dbfaf4b236910530b967a3fb9de25b68bcd36",
      "old_mode": 33188,
      "old_path": "drivers/virtio/virtio_pci_modern_dev.c",
      "new_id": "710d3bd45b4f13471cb1042dc4b2bf8dba6dac07",
      "new_mode": 33188,
      "new_path": "drivers/virtio/virtio_pci_modern_dev.c"
    }
  ]
}