Linux kernel ASLR Implementation

See here:

http://xorl.wordpress.com/2011/01/16/linux-kernel-aslr-implementation/

linux2.6.27下的地址随机分布：
cat /proc/self/maps|egrep '(libc|heap|stack)'
09a2c000-09a4d000 rw-p 09a2c000 00:00 0 [heap]
b7df1000-b7f49000 r-xp 00000000 08:01 409505 /lib/tls/i686/cmov/libc-2.8.90.so
b7f49000-b7f4b000 r--p 00158000 08:01 409505 /lib/tls/i686/cmov/libc-2.8.90.so
b7f4b000-b7f4c000 rw-p 0015a000 08:01 409505 /lib/tls/i686/cmov/libc-2.8.90.so
bff6d000-bff82000 rw-p bffeb000 00:00 0 [stack]

cat /proc/self/maps|egrep '(libc|heap|stack)'
09b25000-09b46000 rw-p 09b25000 00:00 0 [heap]
b7f15000-b806d000 r-xp 00000000 08:01 409505 /lib/tls/i686/cmov/libc-2.8.90.so
b806d000-b806f000 r--p 00158000 08:01 409505 /lib/tls/i686/cmov/libc-2.8.90.so
b806f000-b8070000 rw-p 0015a000 08:01 409505 /lib/tls/i686/cmov/libc-2.8.90.so
bf990000-bf9a5000 rw-p bffeb000 00:00 0 [stack]

How to turn off ASLR in Ubuntu 9.10

$ sysctl -w kernel.randomize_va_space=0

or

$ sudo -s
# echo 0 > /proc/sys/kernel/randomize_va_space