[grsec] [Full-disclosure] Linux NULL pointer dereference due to incorrect proto_ops initializations

[bodik]

Brad Spengler wrote:
>> on my kernels results in:
>>
>> mprotect: permission denied
>>
>> next after chpax -permsx exploit
>>
>> results in
>> mmap: Invalid argument
>>
>> but still i don't have min_mmap (2.6.19.2)
>>
>> the former wunderbar exploit with mplayer ends up with no /proc/kallsyms
>>
>>
>> well, am'i well protected or just too lame to figure out i'am not ??
> 
> If your machine is running a 32bit kernel, based on your config below 
yes

> HIDESYM also makes things more difficult (though again, not impossible) 
> for 2.6.29 and above kernels.  You can test further for your particular 
> kernel by returning 0 in the symbol lookup function instead of doing an 
> exit(0).  Symbols actually aren't needed for that old of a kernel.

i tried and it ends up with:

"unable to find a vulnerable domain, sorry"

that should be enough for me. i won't recompile kernel to add support of any
vulnerable domain to further testing. as i understood KERNEXEC should protect me
anyway ...

thanx a lot for your answer

bodik