diff options
Diffstat (limited to 'drivers/misc/lkdtm')
| -rw-r--r-- | drivers/misc/lkdtm/bugs.c | 11 | ||||
| -rw-r--r-- | drivers/misc/lkdtm/cfi.c | 3 | ||||
| -rw-r--r-- | drivers/misc/lkdtm/core.c | 58 | ||||
| -rw-r--r-- | drivers/misc/lkdtm/fortify.c | 3 | ||||
| -rw-r--r-- | drivers/misc/lkdtm/heap.c | 97 | ||||
| -rw-r--r-- | drivers/misc/lkdtm/lkdtm.h | 46 | ||||
| -rw-r--r-- | drivers/misc/lkdtm/stackleak.c | 4 | ||||
| -rw-r--r-- | drivers/misc/lkdtm/usercopy.c | 7 |
8 files changed, 213 insertions, 16 deletions
diff --git a/drivers/misc/lkdtm/bugs.c b/drivers/misc/lkdtm/bugs.c index a164896dc6d4..88c218a9f8b3 100644 --- a/drivers/misc/lkdtm/bugs.c +++ b/drivers/misc/lkdtm/bugs.c @@ -161,6 +161,9 @@ void lkdtm_UNALIGNED_LOAD_STORE_WRITE(void) if (*p == 0) val = 0x87654321; *p = val; + + if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) + pr_err("XFAIL: arch has CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS\n"); } void lkdtm_SOFTLOCKUP(void) @@ -300,8 +303,10 @@ void lkdtm_CORRUPT_LIST_ADD(void) if (target[0] == NULL && target[1] == NULL) pr_err("Overwrite did not happen, but no BUG?!\n"); - else + else { pr_err("list_add() corruption not detected!\n"); + pr_expected_config(CONFIG_DEBUG_LIST); + } } void lkdtm_CORRUPT_LIST_DEL(void) @@ -325,8 +330,10 @@ void lkdtm_CORRUPT_LIST_DEL(void) if (target[0] == NULL && target[1] == NULL) pr_err("Overwrite did not happen, but no BUG?!\n"); - else + else { pr_err("list_del() corruption not detected!\n"); + pr_expected_config(CONFIG_DEBUG_LIST); + } } /* Test that VMAP_STACK is actually allocating with a leading guard page */ diff --git a/drivers/misc/lkdtm/cfi.c b/drivers/misc/lkdtm/cfi.c index e73ebdbfa806..c9aeddef1044 100644 --- a/drivers/misc/lkdtm/cfi.c +++ b/drivers/misc/lkdtm/cfi.c @@ -38,5 +38,6 @@ void lkdtm_CFI_FORWARD_PROTO(void) func = (void *)lkdtm_increment_int; func(&called_count); - pr_info("Fail: survived mismatched prototype function call!\n"); + pr_err("FAIL: survived mismatched prototype function call!\n"); + pr_expected_config(CONFIG_CFI_CLANG); } diff --git a/drivers/misc/lkdtm/core.c b/drivers/misc/lkdtm/core.c index 8024b6a5cc7f..9dda87c6b54a 100644 --- a/drivers/misc/lkdtm/core.c +++ b/drivers/misc/lkdtm/core.c @@ -26,6 +26,7 @@ #include <linux/init.h> #include <linux/slab.h> #include <linux/debugfs.h> +#include <linux/init.h> #define DEFAULT_COUNT 10 @@ -120,11 +121,14 @@ static const struct crashtype crashtypes[] = { CRASHTYPE(UNALIGNED_LOAD_STORE_WRITE), CRASHTYPE(FORTIFY_OBJECT), CRASHTYPE(FORTIFY_SUBOBJECT), - CRASHTYPE(OVERWRITE_ALLOCATION), + 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), @@ -177,9 +181,7 @@ static const struct crashtype crashtypes[] = { CRASHTYPE(STACKLEAK_ERASING), CRASHTYPE(CFI_FORWARD_PROTO), CRASHTYPE(FORTIFIED_STRSCPY), -#ifdef CONFIG_X86_32 CRASHTYPE(DOUBLE_FAULT), -#endif #ifdef CONFIG_PPC_BOOK3S_64 CRASHTYPE(PPC_SLB_MULTIHIT), #endif @@ -399,6 +401,56 @@ static ssize_t direct_entry(struct file *f, const char __user *user_buf, return count; } +#ifndef MODULE +/* + * To avoid needing to export parse_args(), just don't use this code + * when LKDTM is built as a module. + */ +struct check_cmdline_args { + const char *param; + int value; +}; + +static int lkdtm_parse_one(char *param, char *val, + const char *unused, void *arg) +{ + struct check_cmdline_args *args = arg; + + /* short circuit if we already found a value. */ + if (args->value != -ESRCH) + return 0; + if (strncmp(param, args->param, strlen(args->param)) == 0) { + bool bool_result; + int ret; + + ret = kstrtobool(val, &bool_result); + if (ret == 0) + args->value = bool_result; + } + return 0; +} + +int lkdtm_check_bool_cmdline(const char *param) +{ + char *command_line; + struct check_cmdline_args args = { + .param = param, + .value = -ESRCH, + }; + + command_line = kstrdup(saved_command_line, GFP_KERNEL); + if (!command_line) + return -ENOMEM; + + parse_args("Setting sysctl args", command_line, + NULL, 0, -1, -1, &args, lkdtm_parse_one); + + kfree(command_line); + + return args.value; +} +#endif + static struct dentry *lkdtm_debugfs_root; static int __init lkdtm_module_init(void) diff --git a/drivers/misc/lkdtm/fortify.c b/drivers/misc/lkdtm/fortify.c index faf29cf04baa..0f51d31b57ca 100644 --- a/drivers/misc/lkdtm/fortify.c +++ b/drivers/misc/lkdtm/fortify.c @@ -76,7 +76,8 @@ void lkdtm_FORTIFIED_STRSCPY(void) */ strscpy(dst, src, strlen(src)); - pr_warn("FAIL: No overflow in above strscpy()\n"); + pr_err("FAIL: strscpy() overflow not detected!\n"); + pr_expected_config(CONFIG_FORTIFY_SOURCE); kfree(src); } diff --git a/drivers/misc/lkdtm/heap.c b/drivers/misc/lkdtm/heap.c index 1323bc16f113..3d9aae5821a0 100644 --- a/drivers/misc/lkdtm/heap.c +++ b/drivers/misc/lkdtm/heap.c @@ -5,6 +5,7 @@ */ #include "lkdtm.h" #include <linux/slab.h> +#include <linux/vmalloc.h> #include <linux/sched.h> static struct kmem_cache *double_free_cache; @@ -12,17 +13,36 @@ static struct kmem_cache *a_cache; static struct kmem_cache *b_cache; /* + * If there aren't guard pages, it's likely that a consecutive allocation will + * let us overflow into the second allocation without overwriting something real. + */ +void lkdtm_VMALLOC_LINEAR_OVERFLOW(void) +{ + char *one, *two; + + one = vzalloc(PAGE_SIZE); + two = vzalloc(PAGE_SIZE); + + pr_info("Attempting vmalloc linear overflow ...\n"); + memset(one, 0xAA, PAGE_SIZE + 1); + + vfree(two); + vfree(one); +} + +/* * This tries to stay within the next largest power-of-2 kmalloc cache * to avoid actually overwriting anything important if it's not detected * correctly. */ -void lkdtm_OVERWRITE_ALLOCATION(void) +void lkdtm_SLAB_LINEAR_OVERFLOW(void) { size_t len = 1020; u32 *data = kmalloc(len, GFP_KERNEL); if (!data) return; + pr_info("Attempting slab linear overflow ...\n"); data[1024 / sizeof(u32)] = 0x12345678; kfree(data); } @@ -89,9 +109,10 @@ void lkdtm_READ_AFTER_FREE(void) if (saw != *val) { /* Good! Poisoning happened, so declare a win. */ pr_info("Memory correctly poisoned (%x)\n", saw); - BUG(); + } else { + pr_err("FAIL: Memory was not poisoned!\n"); + pr_expected_config_param(CONFIG_INIT_ON_FREE_DEFAULT_ON, "init_on_free"); } - pr_info("Memory was not poisoned\n"); kfree(val); } @@ -145,13 +166,79 @@ void lkdtm_READ_BUDDY_AFTER_FREE(void) if (saw != *val) { /* Good! Poisoning happened, so declare a win. */ pr_info("Memory correctly poisoned (%x)\n", saw); - BUG(); + } else { + pr_err("FAIL: Buddy page was not poisoned!\n"); + pr_expected_config_param(CONFIG_INIT_ON_FREE_DEFAULT_ON, "init_on_free"); + } + + kfree(val); +} + +void lkdtm_SLAB_INIT_ON_ALLOC(void) +{ + u8 *first; + u8 *val; + + first = kmalloc(512, GFP_KERNEL); + if (!first) { + pr_info("Unable to allocate 512 bytes the first time.\n"); + return; + } + + memset(first, 0xAB, 512); + kfree(first); + + val = kmalloc(512, GFP_KERNEL); + if (!val) { + pr_info("Unable to allocate 512 bytes the second time.\n"); + return; + } + if (val != first) { + pr_warn("Reallocation missed clobbered memory.\n"); } - pr_info("Buddy page was not poisoned\n"); + if (memchr(val, 0xAB, 512) == NULL) { + pr_info("Memory appears initialized (%x, no earlier values)\n", *val); + } else { + pr_err("FAIL: Slab was not initialized\n"); + pr_expected_config_param(CONFIG_INIT_ON_ALLOC_DEFAULT_ON, "init_on_alloc"); + } kfree(val); } +void lkdtm_BUDDY_INIT_ON_ALLOC(void) +{ + u8 *first; + u8 *val; + + first = (u8 *)__get_free_page(GFP_KERNEL); + if (!first) { + pr_info("Unable to allocate first free page\n"); + return; + } + + memset(first, 0xAB, PAGE_SIZE); + free_page((unsigned long)first); + + val = (u8 *)__get_free_page(GFP_KERNEL); + if (!val) { + pr_info("Unable to allocate second free page\n"); + return; + } + + if (val != first) { + pr_warn("Reallocation missed clobbered memory.\n"); + } + + if (memchr(val, 0xAB, PAGE_SIZE) == NULL) { + pr_info("Memory appears initialized (%x, no earlier values)\n", *val); + } else { + pr_err("FAIL: Slab was not initialized\n"); + pr_expected_config_param(CONFIG_INIT_ON_ALLOC_DEFAULT_ON, "init_on_alloc"); + } + free_page((unsigned long)val); +} + void lkdtm_SLAB_FREE_DOUBLE(void) { int *val; diff --git a/drivers/misc/lkdtm/lkdtm.h b/drivers/misc/lkdtm/lkdtm.h index 99f90d3e5e9c..6a30b60519f3 100644 --- a/drivers/misc/lkdtm/lkdtm.h +++ b/drivers/misc/lkdtm/lkdtm.h @@ -6,6 +6,47 @@ #include <linux/kernel.h> +#define pr_expected_config(kconfig) \ +{ \ + if (IS_ENABLED(kconfig)) \ + pr_err("Unexpected! This kernel was built with " #kconfig "=y\n"); \ + else \ + pr_warn("This is probably expected, since this kernel was built *without* " #kconfig "=y\n"); \ +} + +#ifndef MODULE +int lkdtm_check_bool_cmdline(const char *param); +#define pr_expected_config_param(kconfig, param) \ +{ \ + if (IS_ENABLED(kconfig)) { \ + switch (lkdtm_check_bool_cmdline(param)) { \ + case 0: \ + pr_warn("This is probably expected, since this kernel was built with " #kconfig "=y but booted with '" param "=N'\n"); \ + break; \ + case 1: \ + pr_err("Unexpected! This kernel was built with " #kconfig "=y and booted with '" param "=Y'\n"); \ + break; \ + default: \ + pr_err("Unexpected! This kernel was built with " #kconfig "=y (and booted without '" param "' specified)\n"); \ + } \ + } else { \ + switch (lkdtm_check_bool_cmdline(param)) { \ + case 0: \ + pr_warn("This is probably expected, as kernel was built *without* " #kconfig "=y and booted with '" param "=N'\n"); \ + break; \ + case 1: \ + pr_err("Unexpected! This kernel was built *without* " #kconfig "=y but booted with '" param "=Y'\n"); \ + break; \ + default: \ + pr_err("This is probably expected, since this kernel was built *without* " #kconfig "=y (and booted without '" param "' specified)\n"); \ + break; \ + } \ + } \ +} +#else +#define pr_expected_config_param(kconfig, param) pr_expected_config(kconfig) +#endif + /* bugs.c */ void __init lkdtm_bugs_init(int *recur_param); void lkdtm_PANIC(void); @@ -39,11 +80,14 @@ void lkdtm_FORTIFY_SUBOBJECT(void); /* heap.c */ void __init lkdtm_heap_init(void); void __exit lkdtm_heap_exit(void); -void lkdtm_OVERWRITE_ALLOCATION(void); +void lkdtm_VMALLOC_LINEAR_OVERFLOW(void); +void lkdtm_SLAB_LINEAR_OVERFLOW(void); void lkdtm_WRITE_AFTER_FREE(void); void lkdtm_READ_AFTER_FREE(void); void lkdtm_WRITE_BUDDY_AFTER_FREE(void); void lkdtm_READ_BUDDY_AFTER_FREE(void); +void lkdtm_SLAB_INIT_ON_ALLOC(void); +void lkdtm_BUDDY_INIT_ON_ALLOC(void); void lkdtm_SLAB_FREE_DOUBLE(void); void lkdtm_SLAB_FREE_CROSS(void); void lkdtm_SLAB_FREE_PAGE(void); diff --git a/drivers/misc/lkdtm/stackleak.c b/drivers/misc/lkdtm/stackleak.c index d1a5c0705be3..00db21ff115e 100644 --- a/drivers/misc/lkdtm/stackleak.c +++ b/drivers/misc/lkdtm/stackleak.c @@ -74,8 +74,8 @@ void lkdtm_STACKLEAK_ERASING(void) end: if (test_failed) { - pr_err("FAIL: the thread stack is NOT properly erased\n"); - dump_stack(); + pr_err("FAIL: the thread stack is NOT properly erased!\n"); + pr_expected_config(CONFIG_GCC_PLUGIN_STACKLEAK); } else { pr_info("OK: the rest of the thread stack is properly erased\n"); } diff --git a/drivers/misc/lkdtm/usercopy.c b/drivers/misc/lkdtm/usercopy.c index 15d220ef35a5..9161ce7ed47a 100644 --- a/drivers/misc/lkdtm/usercopy.c +++ b/drivers/misc/lkdtm/usercopy.c @@ -173,6 +173,8 @@ static void do_usercopy_heap_size(bool to_user) goto free_user; } } + pr_err("FAIL: bad usercopy not detected!\n"); + pr_expected_config_param(CONFIG_HARDENED_USERCOPY, "hardened_usercopy"); free_user: vm_munmap(user_addr, PAGE_SIZE); @@ -248,6 +250,8 @@ static void do_usercopy_heap_whitelist(bool to_user) goto free_user; } } + pr_err("FAIL: bad usercopy not detected!\n"); + pr_expected_config_param(CONFIG_HARDENED_USERCOPY, "hardened_usercopy"); free_user: vm_munmap(user_alloc, PAGE_SIZE); @@ -319,7 +323,8 @@ void lkdtm_USERCOPY_KERNEL(void) pr_warn("copy_to_user failed, but lacked Oops\n"); goto free_user; } - pr_err("FAIL: survived bad copy_to_user()\n"); + pr_err("FAIL: bad copy_to_user() not detected!\n"); + pr_expected_config_param(CONFIG_HARDENED_USERCOPY, "hardened_usercopy"); free_user: vm_munmap(user_addr, PAGE_SIZE); |