From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/drivers/misc/lkdtm.c | 873 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 873 insertions(+) create mode 100644 kernel/drivers/misc/lkdtm.c (limited to 'kernel/drivers/misc/lkdtm.c') diff --git a/kernel/drivers/misc/lkdtm.c b/kernel/drivers/misc/lkdtm.c new file mode 100644 index 000000000..b5abe3412 --- /dev/null +++ b/kernel/drivers/misc/lkdtm.c @@ -0,0 +1,873 @@ +/* + * Kprobe module for testing crash dumps + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * Copyright (C) IBM Corporation, 2006 + * + * Author: Ankita Garg + * + * This module induces system failures at predefined crashpoints to + * evaluate the reliability of crash dumps obtained using different dumping + * solutions. + * + * It is adapted from the Linux Kernel Dump Test Tool by + * Fernando Luis Vazquez Cao + * + * Debugfs support added by Simon Kagstrom + * + * See Documentation/fault-injection/provoke-crashes.txt for instructions + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#ifdef CONFIG_IDE +#include +#endif + +/* + * Make sure our attempts to over run the kernel stack doesn't trigger + * a compiler warning when CONFIG_FRAME_WARN is set. Then make sure we + * recurse past the end of THREAD_SIZE by default. + */ +#if defined(CONFIG_FRAME_WARN) && (CONFIG_FRAME_WARN > 0) +#define REC_STACK_SIZE (CONFIG_FRAME_WARN / 2) +#else +#define REC_STACK_SIZE (THREAD_SIZE / 8) +#endif +#define REC_NUM_DEFAULT ((THREAD_SIZE / REC_STACK_SIZE) * 2) + +#define DEFAULT_COUNT 10 +#define EXEC_SIZE 64 + +enum cname { + CN_INVALID, + CN_INT_HARDWARE_ENTRY, + CN_INT_HW_IRQ_EN, + CN_INT_TASKLET_ENTRY, + CN_FS_DEVRW, + CN_MEM_SWAPOUT, + CN_TIMERADD, + CN_SCSI_DISPATCH_CMD, + CN_IDE_CORE_CP, + CN_DIRECT, +}; + +enum ctype { + CT_NONE, + CT_PANIC, + CT_BUG, + CT_WARNING, + CT_EXCEPTION, + CT_LOOP, + CT_OVERFLOW, + CT_CORRUPT_STACK, + CT_UNALIGNED_LOAD_STORE_WRITE, + CT_OVERWRITE_ALLOCATION, + CT_WRITE_AFTER_FREE, + CT_SOFTLOCKUP, + CT_HARDLOCKUP, + CT_SPINLOCKUP, + CT_HUNG_TASK, + CT_EXEC_DATA, + CT_EXEC_STACK, + CT_EXEC_KMALLOC, + CT_EXEC_VMALLOC, + CT_EXEC_USERSPACE, + CT_ACCESS_USERSPACE, + CT_WRITE_RO, + CT_WRITE_KERN, +}; + +static char* cp_name[] = { + "INT_HARDWARE_ENTRY", + "INT_HW_IRQ_EN", + "INT_TASKLET_ENTRY", + "FS_DEVRW", + "MEM_SWAPOUT", + "TIMERADD", + "SCSI_DISPATCH_CMD", + "IDE_CORE_CP", + "DIRECT", +}; + +static char* cp_type[] = { + "PANIC", + "BUG", + "WARNING", + "EXCEPTION", + "LOOP", + "OVERFLOW", + "CORRUPT_STACK", + "UNALIGNED_LOAD_STORE_WRITE", + "OVERWRITE_ALLOCATION", + "WRITE_AFTER_FREE", + "SOFTLOCKUP", + "HARDLOCKUP", + "SPINLOCKUP", + "HUNG_TASK", + "EXEC_DATA", + "EXEC_STACK", + "EXEC_KMALLOC", + "EXEC_VMALLOC", + "EXEC_USERSPACE", + "ACCESS_USERSPACE", + "WRITE_RO", + "WRITE_KERN", +}; + +static struct jprobe lkdtm; + +static int lkdtm_parse_commandline(void); +static void lkdtm_handler(void); + +static char* cpoint_name; +static char* cpoint_type; +static int cpoint_count = DEFAULT_COUNT; +static int recur_count = REC_NUM_DEFAULT; + +static enum cname cpoint = CN_INVALID; +static enum ctype cptype = CT_NONE; +static int count = DEFAULT_COUNT; +static DEFINE_SPINLOCK(count_lock); +static DEFINE_SPINLOCK(lock_me_up); + +static u8 data_area[EXEC_SIZE]; + +static const unsigned long rodata = 0xAA55AA55; + +module_param(recur_count, int, 0644); +MODULE_PARM_DESC(recur_count, " Recursion level for the stack overflow test"); +module_param(cpoint_name, charp, 0444); +MODULE_PARM_DESC(cpoint_name, " Crash Point, where kernel is to be crashed"); +module_param(cpoint_type, charp, 0444); +MODULE_PARM_DESC(cpoint_type, " Crash Point Type, action to be taken on "\ + "hitting the crash point"); +module_param(cpoint_count, int, 0644); +MODULE_PARM_DESC(cpoint_count, " Crash Point Count, number of times the "\ + "crash point is to be hit to trigger action"); + +static unsigned int jp_do_irq(unsigned int irq) +{ + lkdtm_handler(); + jprobe_return(); + return 0; +} + +static irqreturn_t jp_handle_irq_event(unsigned int irq, + struct irqaction *action) +{ + lkdtm_handler(); + jprobe_return(); + return 0; +} + +static void jp_tasklet_action(struct softirq_action *a) +{ + lkdtm_handler(); + jprobe_return(); +} + +static void jp_ll_rw_block(int rw, int nr, struct buffer_head *bhs[]) +{ + lkdtm_handler(); + jprobe_return(); +} + +struct scan_control; + +static unsigned long jp_shrink_inactive_list(unsigned long max_scan, + struct zone *zone, + struct scan_control *sc) +{ + lkdtm_handler(); + jprobe_return(); + return 0; +} + +static int jp_hrtimer_start(struct hrtimer *timer, ktime_t tim, + const enum hrtimer_mode mode) +{ + lkdtm_handler(); + jprobe_return(); + return 0; +} + +static int jp_scsi_dispatch_cmd(struct scsi_cmnd *cmd) +{ + lkdtm_handler(); + jprobe_return(); + return 0; +} + +#ifdef CONFIG_IDE +static int jp_generic_ide_ioctl(ide_drive_t *drive, struct file *file, + struct block_device *bdev, unsigned int cmd, + unsigned long arg) +{ + lkdtm_handler(); + jprobe_return(); + return 0; +} +#endif + +/* Return the crashpoint number or NONE if the name is invalid */ +static enum ctype parse_cp_type(const char *what, size_t count) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(cp_type); i++) { + if (!strcmp(what, cp_type[i])) + return i + 1; + } + + return CT_NONE; +} + +static const char *cp_type_to_str(enum ctype type) +{ + if (type == CT_NONE || type < 0 || type > ARRAY_SIZE(cp_type)) + return "None"; + + return cp_type[type - 1]; +} + +static const char *cp_name_to_str(enum cname name) +{ + if (name == CN_INVALID || name < 0 || name > ARRAY_SIZE(cp_name)) + return "INVALID"; + + return cp_name[name - 1]; +} + + +static int lkdtm_parse_commandline(void) +{ + int i; + unsigned long flags; + + if (cpoint_count < 1 || recur_count < 1) + return -EINVAL; + + spin_lock_irqsave(&count_lock, flags); + count = cpoint_count; + spin_unlock_irqrestore(&count_lock, flags); + + /* No special parameters */ + if (!cpoint_type && !cpoint_name) + return 0; + + /* Neither or both of these need to be set */ + if (!cpoint_type || !cpoint_name) + return -EINVAL; + + cptype = parse_cp_type(cpoint_type, strlen(cpoint_type)); + if (cptype == CT_NONE) + return -EINVAL; + + for (i = 0; i < ARRAY_SIZE(cp_name); i++) { + if (!strcmp(cpoint_name, cp_name[i])) { + cpoint = i + 1; + return 0; + } + } + + /* Could not find a valid crash point */ + return -EINVAL; +} + +static int recursive_loop(int remaining) +{ + char buf[REC_STACK_SIZE]; + + /* Make sure compiler does not optimize this away. */ + memset(buf, (remaining & 0xff) | 0x1, REC_STACK_SIZE); + if (!remaining) + return 0; + else + return recursive_loop(remaining - 1); +} + +static void do_nothing(void) +{ + return; +} + +/* Must immediately follow do_nothing for size calculuations to work out. */ +static void do_overwritten(void) +{ + pr_info("do_overwritten wasn't overwritten!\n"); + return; +} + +static noinline void corrupt_stack(void) +{ + /* Use default char array length that triggers stack protection. */ + char data[8]; + + memset((void *)data, 0, 64); +} + +static void execute_location(void *dst) +{ + void (*func)(void) = dst; + + pr_info("attempting ok execution at %p\n", do_nothing); + do_nothing(); + + memcpy(dst, do_nothing, EXEC_SIZE); + flush_icache_range((unsigned long)dst, (unsigned long)dst + EXEC_SIZE); + pr_info("attempting bad execution at %p\n", func); + func(); +} + +static void execute_user_location(void *dst) +{ + /* Intentionally crossing kernel/user memory boundary. */ + void (*func)(void) = dst; + + pr_info("attempting ok execution at %p\n", do_nothing); + do_nothing(); + + if (copy_to_user((void __user *)dst, do_nothing, EXEC_SIZE)) + return; + flush_icache_range((unsigned long)dst, (unsigned long)dst + EXEC_SIZE); + pr_info("attempting bad execution at %p\n", func); + func(); +} + +static void lkdtm_do_action(enum ctype which) +{ + switch (which) { + case CT_PANIC: + panic("dumptest"); + break; + case CT_BUG: + BUG(); + break; + case CT_WARNING: + WARN_ON(1); + break; + case CT_EXCEPTION: + *((int *) 0) = 0; + break; + case CT_LOOP: + for (;;) + ; + break; + case CT_OVERFLOW: + (void) recursive_loop(recur_count); + break; + case CT_CORRUPT_STACK: + corrupt_stack(); + break; + case CT_UNALIGNED_LOAD_STORE_WRITE: { + static u8 data[5] __attribute__((aligned(4))) = {1, 2, + 3, 4, 5}; + u32 *p; + u32 val = 0x12345678; + + p = (u32 *)(data + 1); + if (*p == 0) + val = 0x87654321; + *p = val; + break; + } + case CT_OVERWRITE_ALLOCATION: { + size_t len = 1020; + u32 *data = kmalloc(len, GFP_KERNEL); + + data[1024 / sizeof(u32)] = 0x12345678; + kfree(data); + break; + } + case CT_WRITE_AFTER_FREE: { + size_t len = 1024; + u32 *data = kmalloc(len, GFP_KERNEL); + + kfree(data); + schedule(); + memset(data, 0x78, len); + break; + } + case CT_SOFTLOCKUP: + preempt_disable(); + for (;;) + cpu_relax(); + break; + case CT_HARDLOCKUP: + local_irq_disable(); + for (;;) + cpu_relax(); + break; + case CT_SPINLOCKUP: + /* Must be called twice to trigger. */ + spin_lock(&lock_me_up); + /* Let sparse know we intended to exit holding the lock. */ + __release(&lock_me_up); + break; + case CT_HUNG_TASK: + set_current_state(TASK_UNINTERRUPTIBLE); + schedule(); + break; + case CT_EXEC_DATA: + execute_location(data_area); + break; + case CT_EXEC_STACK: { + u8 stack_area[EXEC_SIZE]; + execute_location(stack_area); + break; + } + case CT_EXEC_KMALLOC: { + u32 *kmalloc_area = kmalloc(EXEC_SIZE, GFP_KERNEL); + execute_location(kmalloc_area); + kfree(kmalloc_area); + break; + } + case CT_EXEC_VMALLOC: { + u32 *vmalloc_area = vmalloc(EXEC_SIZE); + execute_location(vmalloc_area); + vfree(vmalloc_area); + break; + } + case CT_EXEC_USERSPACE: { + unsigned long user_addr; + + user_addr = vm_mmap(NULL, 0, PAGE_SIZE, + PROT_READ | PROT_WRITE | PROT_EXEC, + MAP_ANONYMOUS | MAP_PRIVATE, 0); + if (user_addr >= TASK_SIZE) { + pr_warn("Failed to allocate user memory\n"); + return; + } + execute_user_location((void *)user_addr); + vm_munmap(user_addr, PAGE_SIZE); + break; + } + case CT_ACCESS_USERSPACE: { + unsigned long user_addr, tmp; + unsigned long *ptr; + + user_addr = vm_mmap(NULL, 0, PAGE_SIZE, + PROT_READ | PROT_WRITE | PROT_EXEC, + MAP_ANONYMOUS | MAP_PRIVATE, 0); + if (user_addr >= TASK_SIZE) { + pr_warn("Failed to allocate user memory\n"); + return; + } + + ptr = (unsigned long *)user_addr; + + pr_info("attempting bad read at %p\n", ptr); + tmp = *ptr; + tmp += 0xc0dec0de; + + pr_info("attempting bad write at %p\n", ptr); + *ptr = tmp; + + vm_munmap(user_addr, PAGE_SIZE); + + break; + } + case CT_WRITE_RO: { + unsigned long *ptr; + + ptr = (unsigned long *)&rodata; + + pr_info("attempting bad write at %p\n", ptr); + *ptr ^= 0xabcd1234; + + break; + } + case CT_WRITE_KERN: { + size_t size; + unsigned char *ptr; + + size = (unsigned long)do_overwritten - + (unsigned long)do_nothing; + ptr = (unsigned char *)do_overwritten; + + pr_info("attempting bad %zu byte write at %p\n", size, ptr); + memcpy(ptr, (unsigned char *)do_nothing, size); + flush_icache_range((unsigned long)ptr, + (unsigned long)(ptr + size)); + + do_overwritten(); + break; + } + case CT_NONE: + default: + break; + } + +} + +static void lkdtm_handler(void) +{ + unsigned long flags; + bool do_it = false; + + spin_lock_irqsave(&count_lock, flags); + count--; + pr_info("Crash point %s of type %s hit, trigger in %d rounds\n", + cp_name_to_str(cpoint), cp_type_to_str(cptype), count); + + if (count == 0) { + do_it = true; + count = cpoint_count; + } + spin_unlock_irqrestore(&count_lock, flags); + + if (do_it) + lkdtm_do_action(cptype); +} + +static int lkdtm_register_cpoint(enum cname which) +{ + int ret; + + cpoint = CN_INVALID; + if (lkdtm.entry != NULL) + unregister_jprobe(&lkdtm); + + switch (which) { + case CN_DIRECT: + lkdtm_do_action(cptype); + return 0; + case CN_INT_HARDWARE_ENTRY: + lkdtm.kp.symbol_name = "do_IRQ"; + lkdtm.entry = (kprobe_opcode_t*) jp_do_irq; + break; + case CN_INT_HW_IRQ_EN: + lkdtm.kp.symbol_name = "handle_IRQ_event"; + lkdtm.entry = (kprobe_opcode_t*) jp_handle_irq_event; + break; + case CN_INT_TASKLET_ENTRY: + lkdtm.kp.symbol_name = "tasklet_action"; + lkdtm.entry = (kprobe_opcode_t*) jp_tasklet_action; + break; + case CN_FS_DEVRW: + lkdtm.kp.symbol_name = "ll_rw_block"; + lkdtm.entry = (kprobe_opcode_t*) jp_ll_rw_block; + break; + case CN_MEM_SWAPOUT: + lkdtm.kp.symbol_name = "shrink_inactive_list"; + lkdtm.entry = (kprobe_opcode_t*) jp_shrink_inactive_list; + break; + case CN_TIMERADD: + lkdtm.kp.symbol_name = "hrtimer_start"; + lkdtm.entry = (kprobe_opcode_t*) jp_hrtimer_start; + break; + case CN_SCSI_DISPATCH_CMD: + lkdtm.kp.symbol_name = "scsi_dispatch_cmd"; + lkdtm.entry = (kprobe_opcode_t*) jp_scsi_dispatch_cmd; + break; + case CN_IDE_CORE_CP: +#ifdef CONFIG_IDE + lkdtm.kp.symbol_name = "generic_ide_ioctl"; + lkdtm.entry = (kprobe_opcode_t*) jp_generic_ide_ioctl; +#else + pr_info("Crash point not available\n"); + return -EINVAL; +#endif + break; + default: + pr_info("Invalid Crash Point\n"); + return -EINVAL; + } + + cpoint = which; + if ((ret = register_jprobe(&lkdtm)) < 0) { + pr_info("Couldn't register jprobe\n"); + cpoint = CN_INVALID; + } + + return ret; +} + +static ssize_t do_register_entry(enum cname which, struct file *f, + const char __user *user_buf, size_t count, loff_t *off) +{ + char *buf; + int err; + + if (count >= PAGE_SIZE) + return -EINVAL; + + buf = (char *)__get_free_page(GFP_KERNEL); + if (!buf) + return -ENOMEM; + if (copy_from_user(buf, user_buf, count)) { + free_page((unsigned long) buf); + return -EFAULT; + } + /* NULL-terminate and remove enter */ + buf[count] = '\0'; + strim(buf); + + cptype = parse_cp_type(buf, count); + free_page((unsigned long) buf); + + if (cptype == CT_NONE) + return -EINVAL; + + err = lkdtm_register_cpoint(which); + if (err < 0) + return err; + + *off += count; + + return count; +} + +/* Generic read callback that just prints out the available crash types */ +static ssize_t lkdtm_debugfs_read(struct file *f, char __user *user_buf, + size_t count, loff_t *off) +{ + char *buf; + int i, n, out; + + buf = (char *)__get_free_page(GFP_KERNEL); + if (buf == NULL) + return -ENOMEM; + + n = snprintf(buf, PAGE_SIZE, "Available crash types:\n"); + for (i = 0; i < ARRAY_SIZE(cp_type); i++) + n += snprintf(buf + n, PAGE_SIZE - n, "%s\n", cp_type[i]); + buf[n] = '\0'; + + out = simple_read_from_buffer(user_buf, count, off, + buf, n); + free_page((unsigned long) buf); + + return out; +} + +static int lkdtm_debugfs_open(struct inode *inode, struct file *file) +{ + return 0; +} + + +static ssize_t int_hardware_entry(struct file *f, const char __user *buf, + size_t count, loff_t *off) +{ + return do_register_entry(CN_INT_HARDWARE_ENTRY, f, buf, count, off); +} + +static ssize_t int_hw_irq_en(struct file *f, const char __user *buf, + size_t count, loff_t *off) +{ + return do_register_entry(CN_INT_HW_IRQ_EN, f, buf, count, off); +} + +static ssize_t int_tasklet_entry(struct file *f, const char __user *buf, + size_t count, loff_t *off) +{ + return do_register_entry(CN_INT_TASKLET_ENTRY, f, buf, count, off); +} + +static ssize_t fs_devrw_entry(struct file *f, const char __user *buf, + size_t count, loff_t *off) +{ + return do_register_entry(CN_FS_DEVRW, f, buf, count, off); +} + +static ssize_t mem_swapout_entry(struct file *f, const char __user *buf, + size_t count, loff_t *off) +{ + return do_register_entry(CN_MEM_SWAPOUT, f, buf, count, off); +} + +static ssize_t timeradd_entry(struct file *f, const char __user *buf, + size_t count, loff_t *off) +{ + return do_register_entry(CN_TIMERADD, f, buf, count, off); +} + +static ssize_t scsi_dispatch_cmd_entry(struct file *f, + const char __user *buf, size_t count, loff_t *off) +{ + return do_register_entry(CN_SCSI_DISPATCH_CMD, f, buf, count, off); +} + +static ssize_t ide_core_cp_entry(struct file *f, const char __user *buf, + size_t count, loff_t *off) +{ + return do_register_entry(CN_IDE_CORE_CP, f, buf, count, off); +} + +/* Special entry to just crash directly. Available without KPROBEs */ +static ssize_t direct_entry(struct file *f, const char __user *user_buf, + size_t count, loff_t *off) +{ + enum ctype type; + char *buf; + + if (count >= PAGE_SIZE) + return -EINVAL; + if (count < 1) + return -EINVAL; + + buf = (char *)__get_free_page(GFP_KERNEL); + if (!buf) + return -ENOMEM; + if (copy_from_user(buf, user_buf, count)) { + free_page((unsigned long) buf); + return -EFAULT; + } + /* NULL-terminate and remove enter */ + buf[count] = '\0'; + strim(buf); + + type = parse_cp_type(buf, count); + free_page((unsigned long) buf); + if (type == CT_NONE) + return -EINVAL; + + pr_info("Performing direct entry %s\n", cp_type_to_str(type)); + lkdtm_do_action(type); + *off += count; + + return count; +} + +struct crash_entry { + const char *name; + const struct file_operations fops; +}; + +static const struct crash_entry crash_entries[] = { + {"DIRECT", {.read = lkdtm_debugfs_read, + .llseek = generic_file_llseek, + .open = lkdtm_debugfs_open, + .write = direct_entry} }, + {"INT_HARDWARE_ENTRY", {.read = lkdtm_debugfs_read, + .llseek = generic_file_llseek, + .open = lkdtm_debugfs_open, + .write = int_hardware_entry} }, + {"INT_HW_IRQ_EN", {.read = lkdtm_debugfs_read, + .llseek = generic_file_llseek, + .open = lkdtm_debugfs_open, + .write = int_hw_irq_en} }, + {"INT_TASKLET_ENTRY", {.read = lkdtm_debugfs_read, + .llseek = generic_file_llseek, + .open = lkdtm_debugfs_open, + .write = int_tasklet_entry} }, + {"FS_DEVRW", {.read = lkdtm_debugfs_read, + .llseek = generic_file_llseek, + .open = lkdtm_debugfs_open, + .write = fs_devrw_entry} }, + {"MEM_SWAPOUT", {.read = lkdtm_debugfs_read, + .llseek = generic_file_llseek, + .open = lkdtm_debugfs_open, + .write = mem_swapout_entry} }, + {"TIMERADD", {.read = lkdtm_debugfs_read, + .llseek = generic_file_llseek, + .open = lkdtm_debugfs_open, + .write = timeradd_entry} }, + {"SCSI_DISPATCH_CMD", {.read = lkdtm_debugfs_read, + .llseek = generic_file_llseek, + .open = lkdtm_debugfs_open, + .write = scsi_dispatch_cmd_entry} }, + {"IDE_CORE_CP", {.read = lkdtm_debugfs_read, + .llseek = generic_file_llseek, + .open = lkdtm_debugfs_open, + .write = ide_core_cp_entry} }, +}; + +static struct dentry *lkdtm_debugfs_root; + +static int __init lkdtm_module_init(void) +{ + int ret = -EINVAL; + int n_debugfs_entries = 1; /* Assume only the direct entry */ + int i; + + /* Register debugfs interface */ + lkdtm_debugfs_root = debugfs_create_dir("provoke-crash", NULL); + if (!lkdtm_debugfs_root) { + pr_err("creating root dir failed\n"); + return -ENODEV; + } + +#ifdef CONFIG_KPROBES + n_debugfs_entries = ARRAY_SIZE(crash_entries); +#endif + + for (i = 0; i < n_debugfs_entries; i++) { + const struct crash_entry *cur = &crash_entries[i]; + struct dentry *de; + + de = debugfs_create_file(cur->name, 0644, lkdtm_debugfs_root, + NULL, &cur->fops); + if (de == NULL) { + pr_err("could not create %s\n", cur->name); + goto out_err; + } + } + + if (lkdtm_parse_commandline() == -EINVAL) { + pr_info("Invalid command\n"); + goto out_err; + } + + if (cpoint != CN_INVALID && cptype != CT_NONE) { + ret = lkdtm_register_cpoint(cpoint); + if (ret < 0) { + pr_info("Invalid crash point %d\n", cpoint); + goto out_err; + } + pr_info("Crash point %s of type %s registered\n", + cpoint_name, cpoint_type); + } else { + pr_info("No crash points registered, enable through debugfs\n"); + } + + return 0; + +out_err: + debugfs_remove_recursive(lkdtm_debugfs_root); + return ret; +} + +static void __exit lkdtm_module_exit(void) +{ + debugfs_remove_recursive(lkdtm_debugfs_root); + + unregister_jprobe(&lkdtm); + pr_info("Crash point unregistered\n"); +} + +module_init(lkdtm_module_init); +module_exit(lkdtm_module_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Kprobe module for testing crash dumps"); -- cgit 1.2.3-korg