Hi All,

I am writing a skeleton LSM module to only print the message at boot time, but I could not see any printk message in the dmesg.

Below are steps i did to enable the printk messages in the LSM module.

What i did is download linux kernel 2.6.33.3.

1) added the line source security/lsmcustommod/Kconfig        in linuxsrc/security/Kconfig near ima/Kconfig.
2) added "subdir-$(CONFIG_SECURITY_LSMCUSTOMMOD)         += lsmcustommod" line at linuxsrc/security/Makefile
3) created a directory in linuxsrc/security/lsmcustommod and putted three files

            i) lsmcustommod.c
           ii) Kconfig
           iii) Makefile

Kconfig file contents

config SECURITY_LSMCUSTOMMOD
        bool "LSMCUSTOMMOD Support"
        depends on SECURITY
        select NETWORK_SECMARK
        default n
        help

Makefile Contents

obj-$(CONFIG_SECURITY_LSMCUSTOMMOD) := lsmcustommod.o

lsmcustommod.c contents

static __init lsmcustommod_init(void){
        /* register the hooks */

        if (register_security(&lsmcustommod_ops))
                panic("lsmcustommod: Unable to register lsmcustommod with kernel.\n");
        else
                printk("lsmcustommod: registered with the kernel\n");

        return 0;
}

static void __exit lsmcustommod_exit (void)
{
        return;
}

module_init (lsmcustommod_init);
module_exit (lsmcustommod_exit);

MODULE_DESCRIPTION("lsmcustommod");
MODULE_LICENSE("GPL");
#endif /* CONFIG_SECURITY_LSMCUSTOMMOD */

After that I also added some return 0 and printk statments in the lsmcustommod_ops stucture.

lastly disabled all modules in make menuconfig and select LSMCUTOMMOD in security sections of the menufile and compile the kernel by the following command.

make && make modules && make modules_install && make install
updategrub2

--
Toqeer Ali Syed

Red Hat Certified Engineer

mob:     +60166205504
mob:    +92 321 9059916