grsecurity forums

[root@fileserver grsec]# gradm -P admin
Warning: Unable to lock password into physical memory.
Setting up password for role admin
Warning: Unable to lock password into physical memory.
Password:

my .config (Kernel 2.6.11):
#
# Security options
#

#
# Grsecurity
#
CONFIG_GRKERNSEC=y
# CONFIG_GRKERNSEC_LOW is not set
# CONFIG_GRKERNSEC_MEDIUM is not set
# CONFIG_GRKERNSEC_HIGH is not set
CONFIG_GRKERNSEC_CUSTOM=y

#
# Address Space Protection
#
# CONFIG_GRKERNSEC_KMEM is not set
# CONFIG_GRKERNSEC_IO is not set
# CONFIG_GRKERNSEC_PROC_MEMMAP is not set
CONFIG_GRKERNSEC_BRUTE=y
CONFIG_GRKERNSEC_HIDESYM=y

#
# Role Based Access Control Options
#
CONFIG_GRKERNSEC_ACL_HIDEKERN=y
CONFIG_GRKERNSEC_ACL_MAXTRIES=3
CONFIG_GRKERNSEC_ACL_TIMEOUT=900

#
# Filesystem Protections
#
CONFIG_GRKERNSEC_PROC=y
# CONFIG_GRKERNSEC_PROC_USER is not set
CONFIG_GRKERNSEC_PROC_USERGROUP=y
CONFIG_GRKERNSEC_PROC_GID=1001
# CONFIG_GRKERNSEC_PROC_ADD is not set
CONFIG_GRKERNSEC_LINK=y
CONFIG_GRKERNSEC_FIFO=y
CONFIG_GRKERNSEC_CHROOT=y
CONFIG_GRKERNSEC_CHROOT_MOUNT=y
CONFIG_GRKERNSEC_CHROOT_DOUBLE=y
CONFIG_GRKERNSEC_CHROOT_PIVOT=y
CONFIG_GRKERNSEC_CHROOT_CHDIR=y
CONFIG_GRKERNSEC_CHROOT_CHMOD=y
CONFIG_GRKERNSEC_CHROOT_FCHDIR=y
CONFIG_GRKERNSEC_CHROOT_MKNOD=y
CONFIG_GRKERNSEC_CHROOT_SHMAT=y
CONFIG_GRKERNSEC_CHROOT_UNIX=y
CONFIG_GRKERNSEC_CHROOT_FINDTASK=y
CONFIG_GRKERNSEC_CHROOT_NICE=y
CONFIG_GRKERNSEC_CHROOT_SYSCTL=y
CONFIG_GRKERNSEC_CHROOT_CAPS=y

#
# Kernel Auditing
#
CONFIG_GRKERNSEC_AUDIT_GROUP=y
CONFIG_GRKERNSEC_AUDIT_GID=1007
CONFIG_GRKERNSEC_EXECLOG=y
CONFIG_GRKERNSEC_RESLOG=y
CONFIG_GRKERNSEC_CHROOT_EXECLOG=y
CONFIG_GRKERNSEC_AUDIT_CHDIR=y
CONFIG_GRKERNSEC_AUDIT_MOUNT=y
CONFIG_GRKERNSEC_AUDIT_IPC=y
CONFIG_GRKERNSEC_SIGNAL=y
CONFIG_GRKERNSEC_FORKFAIL=y
CONFIG_GRKERNSEC_TIME=y
CONFIG_GRKERNSEC_PROC_IPADDR=y

#
# Executable Protections
#
CONFIG_GRKERNSEC_EXECVE=y
CONFIG_GRKERNSEC_SHM=y
CONFIG_GRKERNSEC_DMESG=y
CONFIG_GRKERNSEC_RANDPID=y
CONFIG_GRKERNSEC_TPE=y
CONFIG_GRKERNSEC_TPE_ALL=y
CONFIG_GRKERNSEC_TPE_GID=1005

#
# Network Protections
#
CONFIG_GRKERNSEC_RANDNET=y
CONFIG_GRKERNSEC_RANDSRC=y
CONFIG_GRKERNSEC_SOCKET=y
# CONFIG_GRKERNSEC_SOCKET_ALL is not set
CONFIG_GRKERNSEC_SOCKET_CLIENT=y
CONFIG_GRKERNSEC_SOCKET_CLIENT_GID=1003
CONFIG_GRKERNSEC_SOCKET_SERVER=y
CONFIG_GRKERNSEC_SOCKET_SERVER_GID=1002

#
# Sysctl support
#
CONFIG_GRKERNSEC_SYSCTL=y
# CONFIG_GRKERNSEC_SYSCTL_ON is not set

#
# Logging Options
#
CONFIG_GRKERNSEC_FLOODTIME=10
CONFIG_GRKERNSEC_FLOODBURST=4

#
# PaX
#
CONFIG_PAX=y

#
# PaX Control
#
# CONFIG_PAX_SOFTMODE is not set
CONFIG_PAX_EI_PAX=y
CONFIG_PAX_PT_PAX_FLAGS=y
# CONFIG_PAX_NO_ACL_FLAGS is not set
CONFIG_PAX_HAVE_ACL_FLAGS=y
# CONFIG_PAX_HOOK_ACL_FLAGS is not set

#
# Non-executable pages
#
CONFIG_PAX_NOEXEC=y
CONFIG_PAX_PAGEEXEC=y
CONFIG_PAX_SEGMEXEC=y
# CONFIG_PAX_DEFAULT_PAGEEXEC is not set
CONFIG_PAX_DEFAULT_SEGMEXEC=y
# CONFIG_PAX_EMUTRAMP is not set
# CONFIG_PAX_MPROTECT is not set

#
# Address Space Layout Randomization
#
CONFIG_PAX_ASLR=y
# CONFIG_PAX_RANDKSTACK is not set
CONFIG_PAX_RANDUSTACK=y
CONFIG_PAX_RANDMMAP=y
CONFIG_PAX_NOVSYSCALL=y
# CONFIG_KEYS is not set
# CONFIG_SECURITY is not set


What's my problem?

What does your ulimit -l report?

That message will only appear when an mlock fails, which would happen if your resource limits don't allow locking of memory.

-Brad

ulimit -l:
32

Any hints or ideas?

Raise the limit, it should work.

-Brad

[root@proxy root]# ulimit -l 15000000
[root@proxy root]# ulimit -l
unlimited
[root@proxy root]# gradm -P
Warning: Unable to lock password into physical memory.
Setting up grsecurity RBAC password
Warning: Unable to lock password into physical memory.
Password:

That isn't the problem (dmesg is empty, no entries according to some reached limits).

I suppose there is a mistake in grsecurity (I'm using 2.6.11.5, grsecurity 2.1.3 compiled with gcc version 3.3.2).

if I choose an other kernel-configuration all works perfectly (but it's less secure):
# Grsecurity
#
CONFIG_GRKERNSEC=y
# CONFIG_GRKERNSEC_LOW is not set
# CONFIG_GRKERNSEC_MEDIUM is not set
# CONFIG_GRKERNSEC_HIGH is not set
CONFIG_GRKERNSEC_CUSTOM=y

#
# Address Space Protection
#
# CONFIG_GRKERNSEC_KMEM is not set
# CONFIG_GRKERNSEC_IO is not set
# CONFIG_GRKERNSEC_PROC_MEMMAP is not set
CONFIG_GRKERNSEC_BRUTE=y
CONFIG_GRKERNSEC_HIDESYM=y

#
# Role Based Access Control Options
#
CONFIG_GRKERNSEC_ACL_HIDEKERN=y
CONFIG_GRKERNSEC_ACL_MAXTRIES=3
CONFIG_GRKERNSEC_ACL_TIMEOUT=900

#
# Filesystem Protections
#
CONFIG_GRKERNSEC_PROC=y
# CONFIG_GRKERNSEC_PROC_USER is not set
CONFIG_GRKERNSEC_PROC_USERGROUP=y
CONFIG_GRKERNSEC_PROC_GID=1001
# CONFIG_GRKERNSEC_PROC_ADD is not set
CONFIG_GRKERNSEC_LINK=y
CONFIG_GRKERNSEC_FIFO=y
CONFIG_GRKERNSEC_CHROOT=y
CONFIG_GRKERNSEC_CHROOT_MOUNT=y
CONFIG_GRKERNSEC_CHROOT_DOUBLE=y
CONFIG_GRKERNSEC_CHROOT_PIVOT=y
CONFIG_GRKERNSEC_CHROOT_CHDIR=y
CONFIG_GRKERNSEC_CHROOT_CHMOD=y
CONFIG_GRKERNSEC_CHROOT_FCHDIR=y
CONFIG_GRKERNSEC_CHROOT_MKNOD=y
CONFIG_GRKERNSEC_CHROOT_SHMAT=y
CONFIG_GRKERNSEC_CHROOT_UNIX=y
CONFIG_GRKERNSEC_CHROOT_FINDTASK=y
CONFIG_GRKERNSEC_CHROOT_NICE=y
CONFIG_GRKERNSEC_CHROOT_SYSCTL=y
CONFIG_GRKERNSEC_CHROOT_CAPS=y

#
# Kernel Auditing
#
CONFIG_GRKERNSEC_AUDIT_GROUP=y
CONFIG_GRKERNSEC_AUDIT_GID=1007
CONFIG_GRKERNSEC_EXECLOG=y
CONFIG_GRKERNSEC_RESLOG=y
CONFIG_GRKERNSEC_CHROOT_EXECLOG=y
CONFIG_GRKERNSEC_AUDIT_CHDIR=y
CONFIG_GRKERNSEC_AUDIT_MOUNT=y
CONFIG_GRKERNSEC_AUDIT_IPC=y
CONFIG_GRKERNSEC_SIGNAL=y
CONFIG_GRKERNSEC_FORKFAIL=y
CONFIG_GRKERNSEC_TIME=y
CONFIG_GRKERNSEC_PROC_IPADDR=y

#
# Executable Protections
#
CONFIG_GRKERNSEC_EXECVE=y
CONFIG_GRKERNSEC_SHM=y
CONFIG_GRKERNSEC_DMESG=y
CONFIG_GRKERNSEC_RANDPID=y
CONFIG_GRKERNSEC_TPE=y
CONFIG_GRKERNSEC_TPE_ALL=y
CONFIG_GRKERNSEC_TPE_GID=1005

#
# Network Protections
#
CONFIG_GRKERNSEC_RANDNET=y
CONFIG_GRKERNSEC_RANDSRC=y
CONFIG_GRKERNSEC_SOCKET=y
# CONFIG_GRKERNSEC_SOCKET_ALL is not set
CONFIG_GRKERNSEC_SOCKET_CLIENT=y
CONFIG_GRKERNSEC_SOCKET_CLIENT_GID=1003
CONFIG_GRKERNSEC_SOCKET_SERVER=y
CONFIG_GRKERNSEC_SOCKET_SERVER_GID=1002

#
# Sysctl support
#
CONFIG_GRKERNSEC_SYSCTL=y
# CONFIG_GRKERNSEC_SYSCTL_ON is not set

#
# Logging Options
#
CONFIG_GRKERNSEC_FLOODTIME=10
CONFIG_GRKERNSEC_FLOODBURST=4

#
# PaX
#
CONFIG_PAX=y

#
# PaX Control
#
# CONFIG_PAX_SOFTMODE is not set
# CONFIG_PAX_EI_PAX is not set
# CONFIG_PAX_PT_PAX_FLAGS is not set
# CONFIG_PAX_NO_ACL_FLAGS is not set
CONFIG_PAX_HAVE_ACL_FLAGS=y
# CONFIG_PAX_HOOK_ACL_FLAGS is not set

#
# Non-executable pages
#
# CONFIG_PAX_NOEXEC is not set

#
# Address Space Layout Randomization
#
CONFIG_PAX_ASLR=y
# CONFIG_PAX_RANDKSTACK is not set
CONFIG_PAX_RANDUSTACK=y
CONFIG_PAX_RANDMMAP=y
CONFIG_PAX_NOVSYSCALL=y
# CONFIG_KEYS is not set
# CONFIG_SECURITY is not set

Paste an strace -e mlock,mlockall of the process

-Brad

[root@proxy root]# strace -e mlock,mlockall gradm -P
mlock(0x5b55bbb0, 256) = -1 EFAULT (Bad address)
Warning: Unable to lock password into physical memory.
Setting up grsecurity RBAC password
mlock(0x5b559900, 256) = -1 EFAULT (Bad address)
Warning: Unable to lock password into physical memory.
Password: [CRTL-C]
[root@proxy root]#

Hope that helps...

Does it work if you chpax -spmr the gradm binary?

-Brad

Now it seems to work.

But what' the problem? - Why doesn't gradm run "aout of the box"?

There is a bug in PaX with mlock if mprotect is disabled on a binary with segmexec/pageexec enabled, or if mprotect is disabled in the configuration with segmexec/pageexec enabled. The problem has been fixed, and I'll reply soon with a patch for the problem.

-Brad