diff options
| -rw-r--r-- | drivers/misc/lkdtm.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/drivers/misc/lkdtm.c b/drivers/misc/lkdtm.c index 8bc7f0bcd945..2fc0586ce3bb 100644 --- a/drivers/misc/lkdtm.c +++ b/drivers/misc/lkdtm.c @@ -43,6 +43,7 @@ #include <linux/slab.h> #include <scsi/scsi_cmnd.h> #include <linux/debugfs.h> +#include <linux/vmalloc.h> #ifdef CONFIG_IDE #include <linux/ide.h> @@ -50,6 +51,7 @@ #define DEFAULT_COUNT 10 #define REC_NUM_DEFAULT 10 +#define EXEC_SIZE 64 enum cname { CN_INVALID, @@ -80,6 +82,10 @@ enum ctype { CT_HARDLOCKUP, CT_SPINLOCKUP, CT_HUNG_TASK, + CT_EXEC_DATA, + CT_EXEC_STACK, + CT_EXEC_KMALLOC, + CT_EXEC_VMALLOC, }; static char* cp_name[] = { @@ -109,6 +115,10 @@ static char* cp_type[] = { "HARDLOCKUP", "SPINLOCKUP", "HUNG_TASK", + "EXEC_DATA", + "EXEC_STACK", + "EXEC_KMALLOC", + "EXEC_VMALLOC", }; static struct jprobe lkdtm; @@ -127,6 +137,8 @@ static int count = DEFAULT_COUNT; static DEFINE_SPINLOCK(count_lock); static DEFINE_SPINLOCK(lock_me_up); +static u8 data_area[EXEC_SIZE]; + module_param(recur_count, int, 0644); MODULE_PARM_DESC(recur_count, " Recursion level for the stack overflow test, "\ "default is 10"); @@ -280,6 +292,19 @@ static int recursive_loop(int a) return recursive_loop(a); } +static void do_nothing(void) +{ + return; +} + +static void execute_location(void *dst) +{ + void (*func)(void) = dst; + + memcpy(dst, do_nothing, EXEC_SIZE); + func(); +} + static void lkdtm_do_action(enum ctype which) { switch (which) { @@ -356,6 +381,26 @@ static void lkdtm_do_action(enum ctype which) 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_NONE: default: break; |