kmod-nokeyctl
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Comment:Updated to print UID of user invoking keyctl()
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SHA1: 6546477ed59c71f6a0f47e3b10f25f373a7c92ea
User & Date: rkeene on 2016-01-20 15:26:56
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Context
2016-01-20
15:48
Updated with better search for sys_call_table address in files Leaf check-in: a0ad8fcf5e user: rkeene tags: trunk
15:26
Updated to print UID of user invoking keyctl() check-in: 6546477ed5 user: rkeene tags: trunk, 1
15:26
Added extra clean operations check-in: 3c8ede0b8b user: rkeene tags: trunk
Changes
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Modified nokeyctl.c from [4f334e08a5] to [c5e833d508].

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#include <linux/init.h>

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/syscalls.h>
#include <linux/sched.h>
#include <linux/cred.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Alessandro Ghedini and Mike Perry");
MODULE_DESCRIPTION("disable the keyctl() system call");

/* ia32 entry */
#define __NR_compat_keyctl 311

static asmlinkage long (*o_ptr)(int cmd, ...);
#if defined(__enable_32bits_support)
static asmlinkage long (*o_ptr32)(int cmd, ...);
#endif

asmlinkage long nokeyctl(int cmd, ...) {
	printk("[nokeyctl] keyctl() invoked by process %i\n", current->pid);
	printk("[nokeyctl] keyctl() invoked by process %llu, user id = %llu\n", \
		(unsigned long long) current->pid, \
		(unsigned long long) (get_current_user()->uid.val)
	);

	return(-EPERM);
}

static void sys_call_table_make_rw(void **addr);
static void sys_call_table_make_ro(void **addr);
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