117 lines
3.8 KiB
C
117 lines
3.8 KiB
C
#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/mm.h>
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#include <linux/highmem.h>
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#include <linux/io.h>
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#include <linux/types.h>
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extern int tima_debug_modify_kernel(const char *val, struct kernel_param *kp);
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#define DEBUG_LOG_SIZE (1<<20)
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#define TIMA_DEBUG_LOGGING_START (0xB8000000)
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#define TIMA_SECURE_LOGGING_START (TIMA_DEBUG_LOGGING_START + DEBUG_LOG_SIZE)
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#define DEBUG_LOG_MAGIC (0xaabbccdd)
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#define DEBUG_LOG_ENTRY_SIZE 128
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typedef struct debug_log_entry_s {
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uint32_t timestamp; /* timestamp at which log entry was made*/
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uint32_t logger_id; /* id is 1 for tima, 2 for lkmauth app */
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#define DEBUG_LOG_MSG_SIZE (DEBUG_LOG_ENTRY_SIZE - sizeof(uint32_t) - sizeof(uint32_t))
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char log_msg[DEBUG_LOG_MSG_SIZE]; /* buffer for the entry */
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} __attribute__ ((packed)) debug_log_entry_t;
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typedef struct debug_log_header_s {
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uint32_t magic; /* magic number */
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uint32_t log_start_addr; /* address at which log starts */
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uint32_t log_write_addr; /* address at which next entry is written*/
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uint32_t num_log_entries; /* number of log entries */
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char padding[DEBUG_LOG_ENTRY_SIZE - 4 * sizeof(uint32_t)];
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} __attribute__ ((packed)) debug_log_header_t;
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#define DRIVER_DESC "A kernel module to read tima debug log"
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unsigned long *tima_log_addr;
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unsigned long *tima_debug_log_addr;
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unsigned long *tima_secure_log_addr;
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/* leave the following definithion of module param call here for the compatibility with other models */
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module_param_call(force_modify, tima_debug_modify_kernel, NULL, NULL, 0644);
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ssize_t tima_read(struct file *filep, char __user *buf, size_t size, loff_t *offset)
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{
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/* First check is to get rid of integer overflow exploits */
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if(size > DEBUG_LOG_SIZE || (*offset) + size > DEBUG_LOG_SIZE) {
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pr_err("Extra read\n");
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return -EINVAL;
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}
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if( !strcmp(filep->f_path.dentry->d_iname, "tima_debug_log"))
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tima_log_addr = tima_debug_log_addr;
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else if( !strcmp(filep->f_path.dentry->d_iname, "tima_secure_log"))
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tima_log_addr = tima_secure_log_addr;
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else {
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pr_err("NO tima*log\n");
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return -1;
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}
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if(copy_to_user(buf, (const char *)tima_log_addr + (*offset), size)) {
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pr_err("Copy to user failed\n");
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return -1;
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} else {
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*offset += size;
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return size;
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}
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}
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static const struct file_operations tima_proc_fops = {
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.read = tima_read,
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};
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/**
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* tima_debug_log_read_init - Initialization function for TIMA
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*
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* It creates and initializes tima proc entry with initialized read handler
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*/
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static int __init tima_debug_log_read_init(void)
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{
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if(proc_create("tima_debug_log", 0644, NULL, &tima_proc_fops) == NULL) {
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pr_err("tima_debug_log_read_init: Error creating proc entry\n");
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goto error_return;
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}
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if(proc_create("tima_secure_log", 0644, NULL, &tima_proc_fops) == NULL) {
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pr_err("tima_secure_log_read_init: Error creating proc entry\n");
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goto remove_debug_entry;
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}
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pr_info("%s: Registering /proc/tima_debug_log Interface\n", __func__);
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tima_debug_log_addr = (unsigned long *)phys_to_virt(TIMA_DEBUG_LOGGING_START);
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tima_secure_log_addr = (unsigned long *)phys_to_virt(TIMA_SECURE_LOGGING_START);
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return 0;
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remove_debug_entry:
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remove_proc_entry("tima_debug_log", NULL);
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error_return:
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return -1;
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}
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/**
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* tima_debug_log_read_exit - Cleanup Code for TIMA
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*
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* It removes /proc/tima proc entry and does the required cleanup operations
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*/
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static void __exit tima_debug_log_read_exit(void)
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{
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remove_proc_entry("tima_debug_log", NULL);
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remove_proc_entry("tima_secure_log", NULL);
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pr_info("Deregistering /proc/tima_debug_log Interface\n");
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}
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module_init(tima_debug_log_read_init);
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module_exit(tima_debug_log_read_exit);
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MODULE_DESCRIPTION(DRIVER_DESC);
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