#define DEFAULT_COUNT 10
-static int lkdtm_parse_commandline(void);
static void lkdtm_handler(void);
+static int lkdtm_debugfs_open(struct inode *inode, struct file *file);
+static ssize_t lkdtm_debugfs_read(struct file *f, char __user *user_buf,
+ size_t count, loff_t *off);
+static ssize_t direct_entry(struct file *f, const char __user *user_buf,
+ size_t count, loff_t *off);
+static ssize_t lkdtm_debugfs_entry(struct file *f,
+ const char __user *user_buf,
+ size_t count, loff_t *off);
+
/* jprobe entry point handlers. */
static unsigned int jp_do_irq(unsigned int irq)
}
#endif
-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,
+
+/* Crash points */
+struct crashpoint {
+ const char *name;
+ const struct file_operations fops;
+ struct jprobe jprobe;
};
-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_READ_AFTER_FREE,
- CT_WRITE_BUDDY_AFTER_FREE,
- CT_READ_BUDDY_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_RODATA,
- CT_EXEC_USERSPACE,
- CT_ACCESS_USERSPACE,
- CT_WRITE_RO,
- CT_WRITE_RO_AFTER_INIT,
- CT_WRITE_KERN,
- CT_ATOMIC_UNDERFLOW,
- CT_ATOMIC_OVERFLOW,
- CT_USERCOPY_HEAP_SIZE_TO,
- CT_USERCOPY_HEAP_SIZE_FROM,
- CT_USERCOPY_HEAP_FLAG_TO,
- CT_USERCOPY_HEAP_FLAG_FROM,
- CT_USERCOPY_STACK_FRAME_TO,
- CT_USERCOPY_STACK_FRAME_FROM,
- CT_USERCOPY_STACK_BEYOND,
- CT_USERCOPY_KERNEL,
+#define CRASHPOINT(_name, _write, _symbol, _entry) \
+ { \
+ .name = _name, \
+ .fops = { \
+ .read = lkdtm_debugfs_read, \
+ .llseek = generic_file_llseek, \
+ .open = lkdtm_debugfs_open, \
+ .write = _write, \
+ }, \
+ .jprobe = { \
+ .kp.symbol_name = _symbol, \
+ .entry = (kprobe_opcode_t *)_entry, \
+ }, \
+ }
+
+/* Define the possible places where we can trigger a crash point. */
+struct crashpoint crashpoints[] = {
+ CRASHPOINT("DIRECT", direct_entry,
+ NULL, NULL),
+#ifdef CONFIG_KPROBES
+ CRASHPOINT("INT_HARDWARE_ENTRY", lkdtm_debugfs_entry,
+ "do_IRQ", jp_do_irq),
+ CRASHPOINT("INT_HW_IRQ_EN", lkdtm_debugfs_entry,
+ "handle_IRQ_event", jp_handle_irq_event),
+ CRASHPOINT("INT_TASKLET_ENTRY", lkdtm_debugfs_entry,
+ "tasklet_action", jp_tasklet_action),
+ CRASHPOINT("FS_DEVRW", lkdtm_debugfs_entry,
+ "ll_rw_block", jp_ll_rw_block),
+ CRASHPOINT("MEM_SWAPOUT", lkdtm_debugfs_entry,
+ "shrink_inactive_list", jp_shrink_inactive_list),
+ CRASHPOINT("TIMERADD", lkdtm_debugfs_entry,
+ "hrtimer_start", jp_hrtimer_start),
+ CRASHPOINT("SCSI_DISPATCH_CMD", lkdtm_debugfs_entry,
+ "scsi_dispatch_cmd", jp_scsi_dispatch_cmd),
+# ifdef CONFIG_IDE
+ CRASHPOINT("IDE_CORE_CP", lkdtm_debugfs_entry,
+ "generic_ide_ioctl", jp_generic_ide_ioctl),
+# endif
+#endif
};
-static char* cp_name[] = {
- "INVALID",
- "INT_HARDWARE_ENTRY",
- "INT_HW_IRQ_EN",
- "INT_TASKLET_ENTRY",
- "FS_DEVRW",
- "MEM_SWAPOUT",
- "TIMERADD",
- "SCSI_DISPATCH_CMD",
- "IDE_CORE_CP",
- "DIRECT",
+
+/* Crash types. */
+struct crashtype {
+ const char *name;
+ void (*func)(void);
};
-static char* cp_type[] = {
- "NONE",
- "PANIC",
- "BUG",
- "WARNING",
- "EXCEPTION",
- "LOOP",
- "OVERFLOW",
- "CORRUPT_STACK",
- "UNALIGNED_LOAD_STORE_WRITE",
- "OVERWRITE_ALLOCATION",
- "WRITE_AFTER_FREE",
- "READ_AFTER_FREE",
- "WRITE_BUDDY_AFTER_FREE",
- "READ_BUDDY_AFTER_FREE",
- "SOFTLOCKUP",
- "HARDLOCKUP",
- "SPINLOCKUP",
- "HUNG_TASK",
- "EXEC_DATA",
- "EXEC_STACK",
- "EXEC_KMALLOC",
- "EXEC_VMALLOC",
- "EXEC_RODATA",
- "EXEC_USERSPACE",
- "ACCESS_USERSPACE",
- "WRITE_RO",
- "WRITE_RO_AFTER_INIT",
- "WRITE_KERN",
- "ATOMIC_UNDERFLOW",
- "ATOMIC_OVERFLOW",
- "USERCOPY_HEAP_SIZE_TO",
- "USERCOPY_HEAP_SIZE_FROM",
- "USERCOPY_HEAP_FLAG_TO",
- "USERCOPY_HEAP_FLAG_FROM",
- "USERCOPY_STACK_FRAME_TO",
- "USERCOPY_STACK_FRAME_FROM",
- "USERCOPY_STACK_BEYOND",
- "USERCOPY_KERNEL",
+#define CRASHTYPE(_name) \
+ { \
+ .name = __stringify(_name), \
+ .func = lkdtm_ ## _name, \
+ }
+
+/* Define the possible types of crashes that can be triggered. */
+struct crashtype crashtypes[] = {
+ CRASHTYPE(PANIC),
+ CRASHTYPE(BUG),
+ CRASHTYPE(WARNING),
+ CRASHTYPE(EXCEPTION),
+ CRASHTYPE(LOOP),
+ CRASHTYPE(OVERFLOW),
+ CRASHTYPE(CORRUPT_STACK),
+ CRASHTYPE(UNALIGNED_LOAD_STORE_WRITE),
+ CRASHTYPE(OVERWRITE_ALLOCATION),
+ CRASHTYPE(WRITE_AFTER_FREE),
+ CRASHTYPE(READ_AFTER_FREE),
+ CRASHTYPE(WRITE_BUDDY_AFTER_FREE),
+ CRASHTYPE(READ_BUDDY_AFTER_FREE),
+ CRASHTYPE(SOFTLOCKUP),
+ CRASHTYPE(HARDLOCKUP),
+ CRASHTYPE(SPINLOCKUP),
+ CRASHTYPE(HUNG_TASK),
+ CRASHTYPE(EXEC_DATA),
+ CRASHTYPE(EXEC_STACK),
+ CRASHTYPE(EXEC_KMALLOC),
+ CRASHTYPE(EXEC_VMALLOC),
+ CRASHTYPE(EXEC_RODATA),
+ CRASHTYPE(EXEC_USERSPACE),
+ CRASHTYPE(ACCESS_USERSPACE),
+ CRASHTYPE(WRITE_RO),
+ CRASHTYPE(WRITE_RO_AFTER_INIT),
+ CRASHTYPE(WRITE_KERN),
+ CRASHTYPE(ATOMIC_UNDERFLOW),
+ CRASHTYPE(ATOMIC_OVERFLOW),
+ CRASHTYPE(USERCOPY_HEAP_SIZE_TO),
+ CRASHTYPE(USERCOPY_HEAP_SIZE_FROM),
+ CRASHTYPE(USERCOPY_HEAP_FLAG_TO),
+ CRASHTYPE(USERCOPY_HEAP_FLAG_FROM),
+ CRASHTYPE(USERCOPY_STACK_FRAME_TO),
+ CRASHTYPE(USERCOPY_STACK_FRAME_FROM),
+ CRASHTYPE(USERCOPY_STACK_BEYOND),
+ CRASHTYPE(USERCOPY_KERNEL),
};
+
/* Global jprobe entry and crashtype. */
-static struct jprobe lkdtm_jprobe;
-static enum cname lkdtm_crashpoint = CN_INVALID;
-static enum ctype lkdtm_crashtype = CT_NONE;
+static struct jprobe *lkdtm_jprobe;
+struct crashpoint *lkdtm_crashpoint;
+struct crashtype *lkdtm_crashtype;
/* Global crash counter and spinlock. */
static int crash_count = DEFAULT_COUNT;
MODULE_PARM_DESC(cpoint_count, " Crash Point Count, number of times the "\
"crash point is to be hit to trigger action");
-/* 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;
- }
-
- 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];
-}
-
-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];
-}
-
-static int lkdtm_parse_commandline(void)
+/* Return the crashtype number or NULL if the name is invalid */
+static struct crashtype *find_crashtype(const char *name)
{
int i;
- unsigned long flags;
-
- if (cpoint_count < 1 || recur_count < 1)
- return -EINVAL;
-
- spin_lock_irqsave(&crash_count_lock, flags);
- crash_count = cpoint_count;
- spin_unlock_irqrestore(&crash_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;
-
- lkdtm_crashtype = parse_cp_type(cpoint_type, strlen(cpoint_type));
- if (lkdtm_crashtype == CT_NONE)
- return -EINVAL;
-
- /* Refuse INVALID as a selectable crashpoint name. */
- if (!strcmp(cpoint_name, "INVALID"))
- return -EINVAL;
-
- for (i = 0; i < ARRAY_SIZE(cp_name); i++) {
- if (!strcmp(cpoint_name, cp_name[i])) {
- lkdtm_crashpoint = i;
- return 0;
- }
+ for (i = 0; i < ARRAY_SIZE(crashtypes); i++) {
+ if (!strcmp(name, crashtypes[i].name))
+ return &crashtypes[i];
}
- /* Could not find a valid crash point */
- return -EINVAL;
+ return NULL;
}
-static void lkdtm_do_action(enum ctype which)
+/*
+ * This is forced noinline just so it distinctly shows up in the stackdump
+ * which makes validation of expected lkdtm crashes easier.
+ */
+static noinline void lkdtm_do_action(struct crashtype *crashtype)
{
- switch (which) {
- case CT_PANIC:
- lkdtm_PANIC();
- break;
- case CT_BUG:
- lkdtm_BUG();
- break;
- case CT_WARNING:
- lkdtm_WARNING();
- break;
- case CT_EXCEPTION:
- lkdtm_EXCEPTION();
- break;
- case CT_LOOP:
- lkdtm_LOOP();
- break;
- case CT_OVERFLOW:
- lkdtm_OVERFLOW();
- break;
- case CT_CORRUPT_STACK:
- lkdtm_CORRUPT_STACK();
- break;
- case CT_UNALIGNED_LOAD_STORE_WRITE:
- lkdtm_UNALIGNED_LOAD_STORE_WRITE();
- break;
- case CT_OVERWRITE_ALLOCATION:
- lkdtm_OVERWRITE_ALLOCATION();
- break;
- case CT_WRITE_AFTER_FREE:
- lkdtm_WRITE_AFTER_FREE();
- break;
- case CT_READ_AFTER_FREE:
- lkdtm_READ_AFTER_FREE();
- break;
- case CT_WRITE_BUDDY_AFTER_FREE:
- lkdtm_WRITE_BUDDY_AFTER_FREE();
- break;
- case CT_READ_BUDDY_AFTER_FREE:
- lkdtm_READ_BUDDY_AFTER_FREE();
- break;
- case CT_SOFTLOCKUP:
- lkdtm_SOFTLOCKUP();
- break;
- case CT_HARDLOCKUP:
- lkdtm_HARDLOCKUP();
- break;
- case CT_SPINLOCKUP:
- lkdtm_SPINLOCKUP();
- break;
- case CT_HUNG_TASK:
- lkdtm_HUNG_TASK();
- break;
- case CT_EXEC_DATA:
- lkdtm_EXEC_DATA();
- break;
- case CT_EXEC_STACK:
- lkdtm_EXEC_STACK();
- break;
- case CT_EXEC_KMALLOC:
- lkdtm_EXEC_KMALLOC();
- break;
- case CT_EXEC_VMALLOC:
- lkdtm_EXEC_VMALLOC();
- break;
- case CT_EXEC_RODATA:
- lkdtm_EXEC_RODATA();
- break;
- case CT_EXEC_USERSPACE:
- lkdtm_EXEC_USERSPACE();
- break;
- case CT_ACCESS_USERSPACE:
- lkdtm_ACCESS_USERSPACE();
- break;
- case CT_WRITE_RO:
- lkdtm_WRITE_RO();
- break;
- case CT_WRITE_RO_AFTER_INIT:
- lkdtm_WRITE_RO_AFTER_INIT();
- break;
- case CT_WRITE_KERN:
- lkdtm_WRITE_KERN();
- break;
- case CT_ATOMIC_UNDERFLOW:
- lkdtm_ATOMIC_UNDERFLOW();
- break;
- case CT_ATOMIC_OVERFLOW:
- lkdtm_ATOMIC_OVERFLOW();
- break;
- case CT_USERCOPY_HEAP_SIZE_TO:
- lkdtm_USERCOPY_HEAP_SIZE_TO();
- break;
- case CT_USERCOPY_HEAP_SIZE_FROM:
- lkdtm_USERCOPY_HEAP_SIZE_FROM();
- break;
- case CT_USERCOPY_HEAP_FLAG_TO:
- lkdtm_USERCOPY_HEAP_FLAG_TO();
- break;
- case CT_USERCOPY_HEAP_FLAG_FROM:
- lkdtm_USERCOPY_HEAP_FLAG_FROM();
- break;
- case CT_USERCOPY_STACK_FRAME_TO:
- lkdtm_USERCOPY_STACK_FRAME_TO();
- break;
- case CT_USERCOPY_STACK_FRAME_FROM:
- lkdtm_USERCOPY_STACK_FRAME_FROM();
- break;
- case CT_USERCOPY_STACK_BEYOND:
- lkdtm_USERCOPY_STACK_BEYOND();
- break;
- case CT_USERCOPY_KERNEL:
- lkdtm_USERCOPY_KERNEL();
- break;
- case CT_NONE:
- default:
- break;
- }
-
+ BUG_ON(!crashtype || !crashtype->func);
+ crashtype->func();
}
+/* Called by jprobe entry points. */
static void lkdtm_handler(void)
{
unsigned long flags;
bool do_it = false;
+ BUG_ON(!lkdtm_crashpoint || !lkdtm_crashtype);
+
spin_lock_irqsave(&crash_count_lock, flags);
crash_count--;
pr_info("Crash point %s of type %s hit, trigger in %d rounds\n",
- cp_name_to_str(lkdtm_crashpoint),
- cp_type_to_str(lkdtm_crashtype), crash_count);
+ lkdtm_crashpoint->name, lkdtm_crashtype->name, crash_count);
if (crash_count == 0) {
do_it = true;
lkdtm_do_action(lkdtm_crashtype);
}
-static int lkdtm_register_cpoint(enum cname which)
+static int lkdtm_register_cpoint(struct crashpoint *crashpoint,
+ struct crashtype *crashtype)
{
int ret;
- lkdtm_crashpoint = CN_INVALID;
- if (lkdtm_jprobe.entry != NULL)
- unregister_jprobe(&lkdtm_jprobe);
-
- switch (which) {
- case CN_DIRECT:
- lkdtm_do_action(lkdtm_crashtype);
+ /* If this doesn't have a symbol, just call immediately. */
+ if (!crashpoint->jprobe.kp.symbol_name) {
+ lkdtm_do_action(crashtype);
return 0;
- case CN_INT_HARDWARE_ENTRY:
- lkdtm_jprobe.kp.symbol_name = "do_IRQ";
- lkdtm_jprobe.entry = (kprobe_opcode_t*) jp_do_irq;
- break;
- case CN_INT_HW_IRQ_EN:
- lkdtm_jprobe.kp.symbol_name = "handle_IRQ_event";
- lkdtm_jprobe.entry = (kprobe_opcode_t*) jp_handle_irq_event;
- break;
- case CN_INT_TASKLET_ENTRY:
- lkdtm_jprobe.kp.symbol_name = "tasklet_action";
- lkdtm_jprobe.entry = (kprobe_opcode_t*) jp_tasklet_action;
- break;
- case CN_FS_DEVRW:
- lkdtm_jprobe.kp.symbol_name = "ll_rw_block";
- lkdtm_jprobe.entry = (kprobe_opcode_t*) jp_ll_rw_block;
- break;
- case CN_MEM_SWAPOUT:
- lkdtm_jprobe.kp.symbol_name = "shrink_inactive_list";
- lkdtm_jprobe.entry = (kprobe_opcode_t*) jp_shrink_inactive_list;
- break;
- case CN_TIMERADD:
- lkdtm_jprobe.kp.symbol_name = "hrtimer_start";
- lkdtm_jprobe.entry = (kprobe_opcode_t*) jp_hrtimer_start;
- break;
- case CN_SCSI_DISPATCH_CMD:
- lkdtm_jprobe.kp.symbol_name = "scsi_dispatch_cmd";
- lkdtm_jprobe.entry = (kprobe_opcode_t*) jp_scsi_dispatch_cmd;
- break;
- case CN_IDE_CORE_CP:
-#ifdef CONFIG_IDE
- lkdtm_jprobe.kp.symbol_name = "generic_ide_ioctl";
- lkdtm_jprobe.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;
}
- lkdtm_crashpoint = which;
- if ((ret = register_jprobe(&lkdtm_jprobe)) < 0) {
- pr_info("Couldn't register jprobe\n");
- lkdtm_crashpoint = CN_INVALID;
+ if (lkdtm_jprobe != NULL)
+ unregister_jprobe(lkdtm_jprobe);
+
+ lkdtm_crashpoint = crashpoint;
+ lkdtm_crashtype = crashtype;
+ lkdtm_jprobe = &crashpoint->jprobe;
+ ret = register_jprobe(lkdtm_jprobe);
+ if (ret < 0) {
+ pr_info("Couldn't register jprobe %s\n",
+ crashpoint->jprobe.kp.symbol_name);
+ lkdtm_jprobe = NULL;
+ lkdtm_crashpoint = NULL;
+ lkdtm_crashtype = NULL;
}
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)
+static ssize_t lkdtm_debugfs_entry(struct file *f,
+ const char __user *user_buf,
+ size_t count, loff_t *off)
{
+ struct crashpoint *crashpoint = file_inode(f)->i_private;
+ struct crashtype *crashtype = NULL;
char *buf;
int err;
buf[count] = '\0';
strim(buf);
- lkdtm_crashtype = parse_cp_type(buf, count);
- free_page((unsigned long) buf);
+ crashtype = find_crashtype(buf);
+ free_page((unsigned long)buf);
- if (lkdtm_crashtype == CT_NONE)
+ if (!crashtype)
return -EINVAL;
- err = lkdtm_register_cpoint(which);
+ err = lkdtm_register_cpoint(crashpoint, crashtype);
if (err < 0)
return err;
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]);
+ for (i = 0; i < ARRAY_SIZE(crashtypes); i++) {
+ n += snprintf(buf + n, PAGE_SIZE - n, "%s\n",
+ crashtypes[i].name);
+ }
buf[n] = '\0';
out = simple_read_from_buffer(user_buf, count, off,
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;
+ struct crashtype *crashtype;
char *buf;
if (count >= PAGE_SIZE)
buf[count] = '\0';
strim(buf);
- type = parse_cp_type(buf, count);
+ crashtype = find_crashtype(buf);
free_page((unsigned long) buf);
- if (type == CT_NONE)
+ if (!crashtype)
return -EINVAL;
- pr_info("Performing direct entry %s\n", cp_type_to_str(type));
- lkdtm_do_action(type);
+ pr_info("Performing direct entry %s\n", crashtype->name);
+ lkdtm_do_action(crashtype);
*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)
{
+ struct crashpoint *crashpoint = NULL;
+ struct crashtype *crashtype = NULL;
int ret = -EINVAL;
- int n_debugfs_entries = 1; /* Assume only the direct entry */
int i;
+ /* Neither or both of these need to be set */
+ if ((cpoint_type || cpoint_name) && !(cpoint_type && cpoint_name)) {
+ pr_err("Need both cpoint_type and cpoint_name or neither\n");
+ return -EINVAL;
+ }
+
+ if (cpoint_type) {
+ crashtype = find_crashtype(cpoint_type);
+ if (!crashtype) {
+ pr_err("Unknown crashtype '%s'\n", cpoint_type);
+ return -EINVAL;
+ }
+ }
+
+ if (cpoint_name) {
+ for (i = 0; i < ARRAY_SIZE(crashpoints); i++) {
+ if (!strcmp(cpoint_name, crashpoints[i].name))
+ crashpoint = &crashpoints[i];
+ }
+
+ /* Refuse unknown crashpoints. */
+ if (!crashpoint) {
+ pr_err("Invalid crashpoint %s\n", cpoint_name);
+ return -EINVAL;
+ }
+ }
+
+ /* Set crash count. */
+ crash_count = cpoint_count;
+
/* Handle test-specific initialization. */
lkdtm_bugs_init(&recur_count);
lkdtm_perms_init();
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];
+ /* Install debugfs trigger files. */
+ for (i = 0; i < ARRAY_SIZE(crashpoints); i++) {
+ struct crashpoint *cur = &crashpoints[i];
struct dentry *de;
de = debugfs_create_file(cur->name, 0644, lkdtm_debugfs_root,
- NULL, &cur->fops);
+ cur, &cur->fops);
if (de == NULL) {
- pr_err("could not create %s\n", cur->name);
+ pr_err("could not create crashpoint %s\n", cur->name);
goto out_err;
}
}
- if (lkdtm_parse_commandline() == -EINVAL) {
- pr_info("Invalid command\n");
- goto out_err;
- }
-
- if (lkdtm_crashpoint != CN_INVALID && lkdtm_crashtype != CT_NONE) {
- ret = lkdtm_register_cpoint(lkdtm_crashpoint);
+ /* Install crashpoint if one was selected. */
+ if (crashpoint) {
+ ret = lkdtm_register_cpoint(crashpoint, crashtype);
if (ret < 0) {
- pr_info("Invalid crash point %d\n", lkdtm_crashpoint);
+ pr_info("Invalid crashpoint %s\n", crashpoint->name);
goto out_err;
}
pr_info("Crash point %s of type %s registered\n",
- cpoint_name, cpoint_type);
+ crashpoint->name, cpoint_type);
} else {
pr_info("No crash points registered, enable through debugfs\n");
}
/* Handle test-specific clean-up. */
lkdtm_usercopy_exit();
- unregister_jprobe(&lkdtm_jprobe);
+ unregister_jprobe(lkdtm_jprobe);
pr_info("Crash point unregistered\n");
}
module_exit(lkdtm_module_exit);
MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("Kprobe module for testing crash dumps");
+MODULE_DESCRIPTION("Kernel crash testing module");
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff