diff options
Diffstat (limited to 'drivers/misc/lkdtm/core.c')
| -rw-r--r-- | drivers/misc/lkdtm/core.c | 180 |
1 files changed, 62 insertions, 118 deletions
diff --git a/drivers/misc/lkdtm/core.c b/drivers/misc/lkdtm/core.c index 9dda87c6b54a..5732fd59a227 100644 --- a/drivers/misc/lkdtm/core.c +++ b/drivers/misc/lkdtm/core.c @@ -26,7 +26,7 @@ #include <linux/init.h> #include <linux/slab.h> #include <linux/debugfs.h> -#include <linux/init.h> +#include <linux/utsname.h> #define DEFAULT_COUNT 10 @@ -79,115 +79,28 @@ static struct crashpoint crashpoints[] = { CRASHPOINT("INT_HARDWARE_ENTRY", "do_IRQ"), CRASHPOINT("INT_HW_IRQ_EN", "handle_irq_event"), CRASHPOINT("INT_TASKLET_ENTRY", "tasklet_action"), - CRASHPOINT("FS_DEVRW", "ll_rw_block"), + CRASHPOINT("FS_SUBMIT_BH", "submit_bh"), CRASHPOINT("MEM_SWAPOUT", "shrink_inactive_list"), CRASHPOINT("TIMERADD", "hrtimer_start"), - CRASHPOINT("SCSI_DISPATCH_CMD", "scsi_dispatch_cmd"), - CRASHPOINT("IDE_CORE_CP", "generic_ide_ioctl"), + CRASHPOINT("SCSI_QUEUE_RQ", "scsi_queue_rq"), #endif }; - -/* Crash types. */ -struct crashtype { - const char *name; - void (*func)(void); -}; - -#define CRASHTYPE(_name) \ - { \ - .name = __stringify(_name), \ - .func = lkdtm_ ## _name, \ - } - -/* Define the possible types of crashes that can be triggered. */ -static const struct crashtype crashtypes[] = { - CRASHTYPE(PANIC), - CRASHTYPE(BUG), - CRASHTYPE(WARNING), - CRASHTYPE(WARNING_MESSAGE), - CRASHTYPE(EXCEPTION), - CRASHTYPE(LOOP), - CRASHTYPE(EXHAUST_STACK), - CRASHTYPE(CORRUPT_STACK), - CRASHTYPE(CORRUPT_STACK_STRONG), - CRASHTYPE(REPORT_STACK), - CRASHTYPE(CORRUPT_LIST_ADD), - CRASHTYPE(CORRUPT_LIST_DEL), - CRASHTYPE(STACK_GUARD_PAGE_LEADING), - CRASHTYPE(STACK_GUARD_PAGE_TRAILING), - CRASHTYPE(UNSET_SMEP), - CRASHTYPE(CORRUPT_PAC), - CRASHTYPE(UNALIGNED_LOAD_STORE_WRITE), - CRASHTYPE(FORTIFY_OBJECT), - CRASHTYPE(FORTIFY_SUBOBJECT), - CRASHTYPE(SLAB_LINEAR_OVERFLOW), - CRASHTYPE(VMALLOC_LINEAR_OVERFLOW), - CRASHTYPE(WRITE_AFTER_FREE), - CRASHTYPE(READ_AFTER_FREE), - CRASHTYPE(WRITE_BUDDY_AFTER_FREE), - CRASHTYPE(READ_BUDDY_AFTER_FREE), - CRASHTYPE(SLAB_INIT_ON_ALLOC), - CRASHTYPE(BUDDY_INIT_ON_ALLOC), - CRASHTYPE(SLAB_FREE_DOUBLE), - CRASHTYPE(SLAB_FREE_CROSS), - CRASHTYPE(SLAB_FREE_PAGE), - CRASHTYPE(SOFTLOCKUP), - CRASHTYPE(HARDLOCKUP), - CRASHTYPE(SPINLOCKUP), - CRASHTYPE(HUNG_TASK), - CRASHTYPE(OVERFLOW_SIGNED), - CRASHTYPE(OVERFLOW_UNSIGNED), - CRASHTYPE(ARRAY_BOUNDS), - CRASHTYPE(EXEC_DATA), - CRASHTYPE(EXEC_STACK), - CRASHTYPE(EXEC_KMALLOC), - CRASHTYPE(EXEC_VMALLOC), - CRASHTYPE(EXEC_RODATA), - CRASHTYPE(EXEC_USERSPACE), - CRASHTYPE(EXEC_NULL), - CRASHTYPE(ACCESS_USERSPACE), - CRASHTYPE(ACCESS_NULL), - CRASHTYPE(WRITE_RO), - CRASHTYPE(WRITE_RO_AFTER_INIT), - CRASHTYPE(WRITE_KERN), - CRASHTYPE(REFCOUNT_INC_OVERFLOW), - CRASHTYPE(REFCOUNT_ADD_OVERFLOW), - CRASHTYPE(REFCOUNT_INC_NOT_ZERO_OVERFLOW), - CRASHTYPE(REFCOUNT_ADD_NOT_ZERO_OVERFLOW), - CRASHTYPE(REFCOUNT_DEC_ZERO), - CRASHTYPE(REFCOUNT_DEC_NEGATIVE), - CRASHTYPE(REFCOUNT_DEC_AND_TEST_NEGATIVE), - CRASHTYPE(REFCOUNT_SUB_AND_TEST_NEGATIVE), - CRASHTYPE(REFCOUNT_INC_ZERO), - CRASHTYPE(REFCOUNT_ADD_ZERO), - CRASHTYPE(REFCOUNT_INC_SATURATED), - CRASHTYPE(REFCOUNT_DEC_SATURATED), - CRASHTYPE(REFCOUNT_ADD_SATURATED), - CRASHTYPE(REFCOUNT_INC_NOT_ZERO_SATURATED), - CRASHTYPE(REFCOUNT_ADD_NOT_ZERO_SATURATED), - CRASHTYPE(REFCOUNT_DEC_AND_TEST_SATURATED), - CRASHTYPE(REFCOUNT_SUB_AND_TEST_SATURATED), - CRASHTYPE(REFCOUNT_TIMING), - CRASHTYPE(ATOMIC_TIMING), - CRASHTYPE(USERCOPY_HEAP_SIZE_TO), - CRASHTYPE(USERCOPY_HEAP_SIZE_FROM), - CRASHTYPE(USERCOPY_HEAP_WHITELIST_TO), - CRASHTYPE(USERCOPY_HEAP_WHITELIST_FROM), - CRASHTYPE(USERCOPY_STACK_FRAME_TO), - CRASHTYPE(USERCOPY_STACK_FRAME_FROM), - CRASHTYPE(USERCOPY_STACK_BEYOND), - CRASHTYPE(USERCOPY_KERNEL), - CRASHTYPE(STACKLEAK_ERASING), - CRASHTYPE(CFI_FORWARD_PROTO), - CRASHTYPE(FORTIFIED_STRSCPY), - CRASHTYPE(DOUBLE_FAULT), -#ifdef CONFIG_PPC_BOOK3S_64 - CRASHTYPE(PPC_SLB_MULTIHIT), +/* List of possible types for crashes that can be triggered. */ +static const struct crashtype_category *crashtype_categories[] = { + &bugs_crashtypes, + &heap_crashtypes, + &perms_crashtypes, + &refcount_crashtypes, + &usercopy_crashtypes, + &stackleak_crashtypes, + &cfi_crashtypes, + &fortify_crashtypes, +#ifdef CONFIG_PPC_64S_HASH_MMU + &powerpc_crashtypes, #endif }; - /* Global kprobe entry and crashtype. */ static struct kprobe *lkdtm_kprobe; static struct crashpoint *lkdtm_crashpoint; @@ -212,15 +125,26 @@ 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"); +/* + * For test debug reporting when CI systems provide terse summaries. + * TODO: Remove this once reasonable reporting exists in most CI systems: + * https://lore.kernel.org/lkml/CAHk-=wiFvfkoFixTapvvyPMN9pq5G-+Dys2eSyBa1vzDGAO5+A@mail.gmail.com + */ +char *lkdtm_kernel_info; /* Return the crashtype number or NULL if the name is invalid */ static const struct crashtype *find_crashtype(const char *name) { - int i; + int cat, idx; + + for (cat = 0; cat < ARRAY_SIZE(crashtype_categories); cat++) { + for (idx = 0; idx < crashtype_categories[cat]->len; idx++) { + struct crashtype *crashtype; - for (i = 0; i < ARRAY_SIZE(crashtypes); i++) { - if (!strcmp(name, crashtypes[i].name)) - return &crashtypes[i]; + crashtype = &crashtype_categories[cat]->crashtypes[idx]; + if (!strcmp(name, crashtype->name)) + return crashtype; + } } return NULL; @@ -229,12 +153,17 @@ static const struct crashtype *find_crashtype(const char *name) /* * This is forced noinline just so it distinctly shows up in the stackdump * which makes validation of expected lkdtm crashes easier. + * + * NOTE: having a valid return value helps prevent the compiler from doing + * tail call optimizations and taking this out of the stack trace. */ -static noinline void lkdtm_do_action(const struct crashtype *crashtype) +static noinline int lkdtm_do_action(const struct crashtype *crashtype) { if (WARN_ON(!crashtype || !crashtype->func)) - return; + return -EINVAL; crashtype->func(); + + return 0; } static int lkdtm_register_cpoint(struct crashpoint *crashpoint, @@ -243,10 +172,8 @@ static int lkdtm_register_cpoint(struct crashpoint *crashpoint, int ret; /* If this doesn't have a symbol, just call immediately. */ - if (!crashpoint->kprobe.symbol_name) { - lkdtm_do_action(crashtype); - return 0; - } + if (!crashpoint->kprobe.symbol_name) + return lkdtm_do_action(crashtype); if (lkdtm_kprobe != NULL) unregister_kprobe(lkdtm_kprobe); @@ -292,7 +219,7 @@ static int lkdtm_kprobe_handler(struct kprobe *kp, struct pt_regs *regs) spin_unlock_irqrestore(&crash_count_lock, flags); if (do_it) - lkdtm_do_action(lkdtm_crashtype); + return lkdtm_do_action(lkdtm_crashtype); return 0; } @@ -340,17 +267,24 @@ static ssize_t lkdtm_debugfs_entry(struct file *f, static ssize_t lkdtm_debugfs_read(struct file *f, char __user *user_buf, size_t count, loff_t *off) { + int n, cat, idx; + ssize_t out; char *buf; - int i, n, out; buf = (char *)__get_free_page(GFP_KERNEL); if (buf == NULL) return -ENOMEM; n = scnprintf(buf, PAGE_SIZE, "Available crash types:\n"); - for (i = 0; i < ARRAY_SIZE(crashtypes); i++) { - n += scnprintf(buf + n, PAGE_SIZE - n, "%s\n", - crashtypes[i].name); + + for (cat = 0; cat < ARRAY_SIZE(crashtype_categories); cat++) { + for (idx = 0; idx < crashtype_categories[cat]->len; idx++) { + struct crashtype *crashtype; + + crashtype = &crashtype_categories[cat]->crashtypes[idx]; + n += scnprintf(buf + n, PAGE_SIZE - n, "%s\n", + crashtype->name); + } } buf[n] = '\0'; @@ -372,6 +306,7 @@ static ssize_t direct_entry(struct file *f, const char __user *user_buf, { const struct crashtype *crashtype; char *buf; + int err; if (count >= PAGE_SIZE) return -EINVAL; @@ -395,9 +330,11 @@ static ssize_t direct_entry(struct file *f, const char __user *user_buf, return -EINVAL; pr_info("Performing direct entry %s\n", crashtype->name); - lkdtm_do_action(crashtype); + err = lkdtm_do_action(crashtype); *off += count; + if (err) + return err; return count; } @@ -492,6 +429,11 @@ static int __init lkdtm_module_init(void) crash_count = cpoint_count; #endif + /* Common initialization. */ + lkdtm_kernel_info = kasprintf(GFP_KERNEL, "kernel (%s %s)", + init_uts_ns.name.release, + init_uts_ns.name.machine); + /* Handle test-specific initialization. */ lkdtm_bugs_init(&recur_count); lkdtm_perms_init(); @@ -540,6 +482,8 @@ static void __exit lkdtm_module_exit(void) if (lkdtm_kprobe != NULL) unregister_kprobe(lkdtm_kprobe); + kfree(lkdtm_kernel_info); + pr_info("Crash point unregistered\n"); } |