[GitHub/LineageOS/android_kernel_samsung_universal7580.git] / drivers / misc / tima_debug_log.c

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/io.h>
#include <linux/types.h>

#define	SECURE_LOG	0
#define	DEBUG_LOG	1

#define	DEBUG_LOG_START			(0x47402000)
#define	SECURE_LOG_START		(0x47502000)
#define DEBUG_RKP_LOG_START		(0x52300000)
#define SECURE_RKP_LOG_START		(0x52400000)

#define	DEBUG_LOG_SIZE	(1<<20)
#define	DEBUG_LOG_MAGIC	(0xaabbccdd)
#define	DEBUG_LOG_ENTRY_SIZE	128

#define TIMA_DEBUG_LOG_SIZE 1<<18
#define TIMA_SEC_LOG_SIZE 0x7000

typedef struct debug_log_entry_s
{
	uint32_t	timestamp;          /* timestamp at which log entry was made*/
	uint32_t	logger_id;          /* id is 1 for tima, 2 for lkmauth app  */
#define	DEBUG_LOG_MSG_SIZE	(DEBUG_LOG_ENTRY_SIZE - sizeof(uint32_t) - sizeof(uint32_t))
	char	log_msg[DEBUG_LOG_MSG_SIZE];      /* buffer for the entry                 */
} __attribute__ ((packed)) debug_log_entry_t;

typedef struct debug_log_header_s
{
	uint32_t	magic;              /* magic number                         */
	uint32_t	log_start_addr;     /* address at which log starts          */
	uint32_t	log_write_addr;     /* address at which next entry is written*/
	uint32_t	num_log_entries;    /* number of log entries                */
	char	padding[DEBUG_LOG_ENTRY_SIZE - 4 * sizeof(uint32_t)];
} __attribute__ ((packed)) debug_log_header_t;

#define DRIVER_DESC   "A kernel module to read tima debug log"

unsigned long *tima_log_addr = 0;
unsigned long *tima_debug_log_addr = 0;
unsigned long *tima_secure_log_addr = 0;
unsigned long *tima_debug_rkp_log_addr = 0;
unsigned long *tima_secure_rkp_log_addr = 0;

ssize_t	tima_read(struct file *filep, char __user *buf, size_t size, loff_t *offset)
{
	/* First check is to get rid of integer overflow exploits */
	if (size > DEBUG_LOG_SIZE || (*offset) + size > DEBUG_LOG_SIZE) {
		printk(KERN_ERR"Extra read\n");
		return -EINVAL;
	}

	if (!strcmp(filep->f_path.dentry->d_iname, "tima_secure_log"))
		tima_log_addr = tima_secure_log_addr;
	else if( !strcmp(filep->f_path.dentry->d_iname, "tima_debug_log"))
		tima_log_addr = tima_debug_log_addr;
	else if(!strcmp(filep->f_path.dentry->d_iname, "tima_debug_rkp_log")) {
		if (*offset >= TIMA_DEBUG_LOG_SIZE) {
			return -EINVAL;
		} else if (*offset + size > TIMA_DEBUG_LOG_SIZE) {
			size = (TIMA_DEBUG_LOG_SIZE) - *offset;
		}
		tima_log_addr = tima_debug_rkp_log_addr;
	}
	else if(!strcmp(filep->f_path.dentry->d_iname, "tima_secure_rkp_log")) {
		if (*offset >= TIMA_SEC_LOG_SIZE) {
			return -EINVAL;
		} else if (*offset + size > TIMA_SEC_LOG_SIZE) {
			size = (TIMA_SEC_LOG_SIZE) - *offset;
		}
		tima_log_addr = tima_secure_rkp_log_addr;
	}

	if (copy_to_user(buf, (const char *)tima_log_addr + (*offset), size)) {
		printk(KERN_ERR"Copy to user failed\n");
		return -1;
	} else {
		*offset += size;
		return size;
	}
}

static const struct file_operations tima_proc_fops = {
	.read		= tima_read,
};

/**
 *      tima_debug_log_read_init -  Initialization function for TIMA
 *
 *      It creates and initializes tima proc entry with initialized read handler 
 */
static int __init tima_debug_log_read_init(void)
{
	if (proc_create("tima_debug_log", 0644,NULL, &tima_proc_fops) == NULL) {
		printk(KERN_ERR"tima_debug_log_read_init: Error creating proc entry\n");
		goto error_return;
	}
	if (proc_create("tima_secure_log", 0644,NULL, &tima_proc_fops) == NULL) {
		printk(KERN_ERR"tima_secure_log_read_init: Error creating proc entry\n");
		goto remove_debug_entry;
	}
	printk(KERN_INFO"tima_debug_log_read_init: Registering /proc/tima_debug_log Interface \n");

	if (proc_create("tima_debug_rkp_log", 0644,NULL, &tima_proc_fops) == NULL) {
		printk(KERN_ERR"tima_debug_rkp_log_read_init: Error creating proc entry\n");
		goto remove_secure_entry;
	}
	if (proc_create("tima_secure_rkp_log", 0644,NULL, &tima_proc_fops) == NULL) {
		printk(KERN_ERR"tima_secure_rkp_log_read_init: Error creating proc entry\n");
		goto remove_debug_rkp_entry;
	}

	tima_debug_log_addr = (unsigned long *)phys_to_virt(DEBUG_LOG_START);
	tima_secure_log_addr = (unsigned long *)phys_to_virt(SECURE_LOG_START);
	tima_debug_rkp_log_addr  = (unsigned long *)phys_to_virt(DEBUG_RKP_LOG_START);
	tima_secure_rkp_log_addr = (unsigned long *)phys_to_virt(SECURE_RKP_LOG_START);
	return 0;

remove_debug_rkp_entry:
	remove_proc_entry("tima_debug_rkp_log", NULL);
remove_secure_entry:
	remove_proc_entry("tima_secure_log", NULL);
remove_debug_entry:
	remove_proc_entry("tima_debug_log", NULL);
error_return:
	return -1;
}

/**
 *      tima_debug_log_read_exit -  Cleanup Code for TIMA
 *
 *      It removes /proc/tima proc entry and does the required cleanup operations 
 */
static void __exit tima_debug_log_read_exit(void)
{
	remove_proc_entry("tima_debug_log", NULL);
	remove_proc_entry("tima_secure_log", NULL);
	remove_proc_entry("tima_debug_rkp_log", NULL);
	remove_proc_entry("tima_secure_rkp_log", NULL);
	printk(KERN_INFO"Deregistering /proc/tima_debug_log Interface\n");
}

module_init(tima_debug_log_read_init);
module_exit(tima_debug_log_read_exit);

MODULE_DESCRIPTION(DRIVER_DESC);
Commit	Line	Data
3c2a0909 S	1	#include <linux/module.h>
	2	#include <linux/kernel.h>
	3	#include <linux/init.h>
	4	#include <linux/types.h>
	5	#include <linux/proc_fs.h>
	6	#include <linux/seq_file.h>
	7	#include <linux/mm.h>
	8	#include <linux/highmem.h>
	9	#include <linux/io.h>
	10	#include <linux/types.h>
	11
	12	#define SECURE_LOG 0
	13	#define DEBUG_LOG 1
	14
	15	#define DEBUG_LOG_START (0x47402000)
	16	#define SECURE_LOG_START (0x47502000)
	17	#define DEBUG_RKP_LOG_START (0x52300000)
	18	#define SECURE_RKP_LOG_START (0x52400000)
	19
	20	#define DEBUG_LOG_SIZE (1<<20)
	21	#define DEBUG_LOG_MAGIC (0xaabbccdd)
	22	#define DEBUG_LOG_ENTRY_SIZE 128
	23
9aaf89b0 S	24	#define TIMA_DEBUG_LOG_SIZE 1<<18
	25	#define TIMA_SEC_LOG_SIZE 0x7000
	26
3c2a0909 S	27	typedef struct debug_log_entry_s
	28	{
	29	uint32_t timestamp; /* timestamp at which log entry was made*/
	30	uint32_t logger_id; /* id is 1 for tima, 2 for lkmauth app */
	31	#define DEBUG_LOG_MSG_SIZE (DEBUG_LOG_ENTRY_SIZE - sizeof(uint32_t) - sizeof(uint32_t))
	32	char log_msg[DEBUG_LOG_MSG_SIZE]; /* buffer for the entry */
	33	} __attribute__ ((packed)) debug_log_entry_t;
	34
	35	typedef struct debug_log_header_s
	36	{
	37	uint32_t magic; /* magic number */
	38	uint32_t log_start_addr; /* address at which log starts */
	39	uint32_t log_write_addr; /* address at which next entry is written*/
	40	uint32_t num_log_entries; /* number of log entries */
	41	char padding[DEBUG_LOG_ENTRY_SIZE - 4 * sizeof(uint32_t)];
	42	} __attribute__ ((packed)) debug_log_header_t;
	43
	44	#define DRIVER_DESC "A kernel module to read tima debug log"
	45
	46	unsigned long *tima_log_addr = 0;
	47	unsigned long *tima_debug_log_addr = 0;
	48	unsigned long *tima_secure_log_addr = 0;
	49	unsigned long *tima_debug_rkp_log_addr = 0;
	50	unsigned long *tima_secure_rkp_log_addr = 0;
	51
	52	ssize_t tima_read(struct file filep, char __user buf, size_t size, loff_t *offset)
	53	{
	54	/* First check is to get rid of integer overflow exploits */
	55	if (size > DEBUG_LOG_SIZE \|\| (*offset) + size > DEBUG_LOG_SIZE) {
	56	printk(KERN_ERR"Extra read\n");
	57	return -EINVAL;
	58	}
	59
	60	if (!strcmp(filep->f_path.dentry->d_iname, "tima_secure_log"))
	61	tima_log_addr = tima_secure_log_addr;
	62	else if( !strcmp(filep->f_path.dentry->d_iname, "tima_debug_log"))
	63	tima_log_addr = tima_debug_log_addr;
	64	else if(!strcmp(filep->f_path.dentry->d_iname, "tima_debug_rkp_log")) {
	65	if (*offset >= TIMA_DEBUG_LOG_SIZE) {
	66	return -EINVAL;
	67	} else if (*offset + size > TIMA_DEBUG_LOG_SIZE) {
	68	size = (TIMA_DEBUG_LOG_SIZE) - *offset;
	69	}
	70	tima_log_addr = tima_debug_rkp_log_addr;
	71	}
	72	else if(!strcmp(filep->f_path.dentry->d_iname, "tima_secure_rkp_log")) {
	73	if (*offset >= TIMA_SEC_LOG_SIZE) {
	74	return -EINVAL;
	75	} else if (*offset + size > TIMA_SEC_LOG_SIZE) {
	76	size = (TIMA_SEC_LOG_SIZE) - *offset;
	77	}
	78	tima_log_addr = tima_secure_rkp_log_addr;
	79	}
	80
	81	if (copy_to_user(buf, (const char )tima_log_addr + (offset), size)) {
	82	printk(KERN_ERR"Copy to user failed\n");
	83	return -1;
	84	} else {
	85	*offset += size;
	86	return size;
	87	}
	88	}
	89
	90	static const struct file_operations tima_proc_fops = {
91	.read = tima_read,
92	};
93
94	/**
95	* tima_debug_log_read_init - Initialization function for TIMA
96	*
97	* It creates and initializes tima proc entry with initialized read handler
98	*/
99	static int __init tima_debug_log_read_init(void)
100	{
101	if (proc_create("tima_debug_log", 0644,NULL, &tima_proc_fops) == NULL) {
102	printk(KERN_ERR"tima_debug_log_read_init: Error creating proc entry\n");
103	goto error_return;
104	}
105	if (proc_create("tima_secure_log", 0644,NULL, &tima_proc_fops) == NULL) {
106	printk(KERN_ERR"tima_secure_log_read_init: Error creating proc entry\n");
107	goto remove_debug_entry;
108	}
109	printk(KERN_INFO"tima_debug_log_read_init: Registering /proc/tima_debug_log Interface \n");
110
111	if (proc_create("tima_debug_rkp_log", 0644,NULL, &tima_proc_fops) == NULL) {
112	printk(KERN_ERR"tima_debug_rkp_log_read_init: Error creating proc entry\n");
113	goto remove_secure_entry;
114	}
115	if (proc_create("tima_secure_rkp_log", 0644,NULL, &tima_proc_fops) == NULL) {
116	printk(KERN_ERR"tima_secure_rkp_log_read_init: Error creating proc entry\n");
117	goto remove_debug_rkp_entry;
118	}
119
120	tima_debug_log_addr = (unsigned long *)phys_to_virt(DEBUG_LOG_START);
121	tima_secure_log_addr = (unsigned long *)phys_to_virt(SECURE_LOG_START);
122	tima_debug_rkp_log_addr = (unsigned long *)phys_to_virt(DEBUG_RKP_LOG_START);
123	tima_secure_rkp_log_addr = (unsigned long *)phys_to_virt(SECURE_RKP_LOG_START);
124	return 0;
125
126	remove_debug_rkp_entry:
127	remove_proc_entry("tima_debug_rkp_log", NULL);
128	remove_secure_entry:
129	remove_proc_entry("tima_secure_log", NULL);
130	remove_debug_entry:
131	remove_proc_entry("tima_debug_log", NULL);
132	error_return:
133	return -1;
134	}
135
136	/**
137	* tima_debug_log_read_exit - Cleanup Code for TIMA
138	*
139	* It removes /proc/tima proc entry and does the required cleanup operations
140	*/
141	static void __exit tima_debug_log_read_exit(void)
142	{
143	remove_proc_entry("tima_debug_log", NULL);
144	remove_proc_entry("tima_secure_log", NULL);
145	remove_proc_entry("tima_debug_rkp_log", NULL);
146	remove_proc_entry("tima_secure_rkp_log", NULL);
147	printk(KERN_INFO"Deregistering /proc/tima_debug_log Interface\n");
148	}
149
150	module_init(tima_debug_log_read_init);
151	module_exit(tima_debug_log_read_exit);
152
153	MODULE_DESCRIPTION(DRIVER_DESC);