About my recent founds :)

found & posted by zer0day

tl;dr

I found a bug, memory leak on v4.16.0-rc5. (KASLR Bypass). Maybe, it works on many LKs (i didn’t check all of them yet).

(Of course, it’s not kptr_restrict stuff :))

Except this, there’re some bugs, also memleak. But i didn’t make them into useful codes :).

Demo Screen…

leak

zero@zer0day:/tmp$ uname -a
Linux zer0day 4.16.0-rc5+ #19 SMP Sun Mar 18 20:44:40 KST 2018 x86_64 GNU/Linux
zero@zer0day:/tmp$ ./leak
zero@zer0day:/tmp$ ./leak 1
[+] Found Kernel Base Address!
[+] kbase : 0xffffffff89e00000
zero@zer0day:/tmp$ su
root@zer0day:/tmp# cat /proc/kallsyms | grep _text | head -n 1
ffffffff89e00000 T _text
root@zer0day:/tmp#

[+] Today (2018-03-29), found another kaslr bypass (kaddr leak), but it seemed to be weird…

zero@zer0day:/tmp$ ./leak
...
zero@zer0day:/tmp$ ./leak 1
[+] Found Kernel Base Address!
[+] kbase : 0xffffffffb2600000
zero@zer0day:/tmp$ ls
leak  leak.c
zero@zer0day:/tmp$ su
root@zer0day:/tmp# cat /proc/kallsyms | grep _text | head -n 1
ffffffffb2600000 T _text
root@zer0day:/tmp# uname -a
Linux zer0day 4.16.0-rc7+ #22 SMP Thu Mar 29 16:46:52 KST 2018 x86_64 GNU/Linux

End