grsecurity forums

I enabled some og the grsecurity and PaX security features, but none of them seem to be enabled. I used paxtest v0.9.5 to test my system and all of them say I am vulnerable or there is no randomization. Do you need to enable the protections manually for them to take any effect?

I have these security options selected:

Enable different security modles
-Socket and Networking Security Hooks
-Default Linux Capabilities
-NSA SELinux Support
--NSA SELinux boot parameter

Grsecurity
-Address Space Protection
--Deny writting to /dev/kmem, /dev/mem, and dev/port
--Remove addresses from /proc/<pid>/[maps|stat]
--Hide kernel symbols
-Role Based Access Control Options
--Hide kernel processes
-Filesystem Protections
--Proc restrictions
--Additional restrictions
--Linking restrictions
--FIFO restriictions
-Executable Protections
--Enforce RLIMIT_NPROC on execs
--Dmesg(8) restriction
--Randomized PIDs
-Network Protections
--Larger entropy pools
--Truly random TCP ISN selection
--Randomized IP IDs
--Randomized TCP source ports
--Randomized RPC XIDs
-Sysctl support
--Sysctl support

Pax
-Enable various Pax Features
--Pax Control
---Support soft mode
---Use legacy ELF header marking
---Use ELF program header marking
--Non-executable pages
---Enforce non-executable pages
--Address Space Layout Randomization
---Randomize kernel stack base
---Randomize user stack base
---Randomize mmap() base
---Disable the vsyscall page

Sapient2003 wrote:I enabled some og the grsecurity and PaX security features, but none of them seem to be enabled. I used paxtest v0.9.5 to test my system and all of them say I am vulnerable or there is no randomization. Do you need to enable the protections manually for them to take any effect?

Err, what is selected here? Most common failure of users is that they forget to enable:

- Use legacy ELF header marking
- Use ELF program header marking

Further make sure you enabled mprotect and aslr and segmexec or pageexec.

ciao, Marc

I see you have sysctl enabled. Did you 'echo 1 > /proc/sys/kernel/grsecurity/setting_name'?