From a3dff71c1c88fc184a1ae5e425ba621d547d16ec Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Sun, 26 Jun 2016 08:46:23 -0700 Subject: lkdtm: split usercopy tests to separate file This splits the USERCOPY_* tests into the new lkdtm_usercopy.c file to help separate things better for readability. Signed-off-by: Kees Cook --- drivers/misc/lkdtm_usercopy.c | 315 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 315 insertions(+) create mode 100644 drivers/misc/lkdtm_usercopy.c (limited to 'drivers/misc/lkdtm_usercopy.c') diff --git a/drivers/misc/lkdtm_usercopy.c b/drivers/misc/lkdtm_usercopy.c new file mode 100644 index 000000000000..9c748e819a35 --- /dev/null +++ b/drivers/misc/lkdtm_usercopy.c @@ -0,0 +1,315 @@ +/* + * This is for all the tests related to copy_to_user() and copy_from_user() + * hardening. + */ +#define pr_fmt(fmt) "lkdtm: " fmt + +#include +#include +#include +#include +#include +#include + +static size_t cache_size = 1024; +static struct kmem_cache *bad_cache; + +static const unsigned char test_text[] = "This is a test.\n"; + +/* + * Instead of adding -Wno-return-local-addr, just pass the stack address + * through a function to obfuscate it from the compiler. + */ +static noinline unsigned char *trick_compiler(unsigned char *stack) +{ + return stack + 0; +} + +static noinline unsigned char *do_usercopy_stack_callee(int value) +{ + unsigned char buf[32]; + int i; + + /* Exercise stack to avoid everything living in registers. */ + for (i = 0; i < sizeof(buf); i++) { + buf[i] = value & 0xff; + } + + return trick_compiler(buf); +} + +static noinline void do_usercopy_stack(bool to_user, bool bad_frame) +{ + unsigned long user_addr; + unsigned char good_stack[32]; + unsigned char *bad_stack; + int i; + + /* Exercise stack to avoid everything living in registers. */ + for (i = 0; i < sizeof(good_stack); i++) + good_stack[i] = test_text[i % sizeof(test_text)]; + + /* This is a pointer to outside our current stack frame. */ + if (bad_frame) { + bad_stack = do_usercopy_stack_callee((uintptr_t)bad_stack); + } else { + /* Put start address just inside stack. */ + bad_stack = task_stack_page(current) + THREAD_SIZE; + bad_stack -= sizeof(unsigned long); + } + + 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; + } + + if (to_user) { + pr_info("attempting good copy_to_user of local stack\n"); + if (copy_to_user((void __user *)user_addr, good_stack, + sizeof(good_stack))) { + pr_warn("copy_to_user failed unexpectedly?!\n"); + goto free_user; + } + + pr_info("attempting bad copy_to_user of distant stack\n"); + if (copy_to_user((void __user *)user_addr, bad_stack, + sizeof(good_stack))) { + pr_warn("copy_to_user failed, but lacked Oops\n"); + goto free_user; + } + } else { + /* + * There isn't a safe way to not be protected by usercopy + * if we're going to write to another thread's stack. + */ + if (!bad_frame) + goto free_user; + + pr_info("attempting good copy_from_user of local stack\n"); + if (copy_from_user(good_stack, (void __user *)user_addr, + sizeof(good_stack))) { + pr_warn("copy_from_user failed unexpectedly?!\n"); + goto free_user; + } + + pr_info("attempting bad copy_from_user of distant stack\n"); + if (copy_from_user(bad_stack, (void __user *)user_addr, + sizeof(good_stack))) { + pr_warn("copy_from_user failed, but lacked Oops\n"); + goto free_user; + } + } + +free_user: + vm_munmap(user_addr, PAGE_SIZE); +} + +static void do_usercopy_heap_size(bool to_user) +{ + unsigned long user_addr; + unsigned char *one, *two; + const size_t size = 1024; + + one = kmalloc(size, GFP_KERNEL); + two = kmalloc(size, GFP_KERNEL); + if (!one || !two) { + pr_warn("Failed to allocate kernel memory\n"); + goto free_kernel; + } + + 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"); + goto free_kernel; + } + + memset(one, 'A', size); + memset(two, 'B', size); + + if (to_user) { + pr_info("attempting good copy_to_user of correct size\n"); + if (copy_to_user((void __user *)user_addr, one, size)) { + pr_warn("copy_to_user failed unexpectedly?!\n"); + goto free_user; + } + + pr_info("attempting bad copy_to_user of too large size\n"); + if (copy_to_user((void __user *)user_addr, one, 2 * size)) { + pr_warn("copy_to_user failed, but lacked Oops\n"); + goto free_user; + } + } else { + pr_info("attempting good copy_from_user of correct size\n"); + if (copy_from_user(one, (void __user *)user_addr, size)) { + pr_warn("copy_from_user failed unexpectedly?!\n"); + goto free_user; + } + + pr_info("attempting bad copy_from_user of too large size\n"); + if (copy_from_user(one, (void __user *)user_addr, 2 * size)) { + pr_warn("copy_from_user failed, but lacked Oops\n"); + goto free_user; + } + } + +free_user: + vm_munmap(user_addr, PAGE_SIZE); +free_kernel: + kfree(one); + kfree(two); +} + +static void do_usercopy_heap_flag(bool to_user) +{ + unsigned long user_addr; + unsigned char *good_buf = NULL; + unsigned char *bad_buf = NULL; + + /* Make sure cache was prepared. */ + if (!bad_cache) { + pr_warn("Failed to allocate kernel cache\n"); + return; + } + + /* + * Allocate one buffer from each cache (kmalloc will have the + * SLAB_USERCOPY flag already, but "bad_cache" won't). + */ + good_buf = kmalloc(cache_size, GFP_KERNEL); + bad_buf = kmem_cache_alloc(bad_cache, GFP_KERNEL); + if (!good_buf || !bad_buf) { + pr_warn("Failed to allocate buffers from caches\n"); + goto free_alloc; + } + + /* Allocate user memory we'll poke at. */ + 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"); + goto free_alloc; + } + + memset(good_buf, 'A', cache_size); + memset(bad_buf, 'B', cache_size); + + if (to_user) { + pr_info("attempting good copy_to_user with SLAB_USERCOPY\n"); + if (copy_to_user((void __user *)user_addr, good_buf, + cache_size)) { + pr_warn("copy_to_user failed unexpectedly?!\n"); + goto free_user; + } + + pr_info("attempting bad copy_to_user w/o SLAB_USERCOPY\n"); + if (copy_to_user((void __user *)user_addr, bad_buf, + cache_size)) { + pr_warn("copy_to_user failed, but lacked Oops\n"); + goto free_user; + } + } else { + pr_info("attempting good copy_from_user with SLAB_USERCOPY\n"); + if (copy_from_user(good_buf, (void __user *)user_addr, + cache_size)) { + pr_warn("copy_from_user failed unexpectedly?!\n"); + goto free_user; + } + + pr_info("attempting bad copy_from_user w/o SLAB_USERCOPY\n"); + if (copy_from_user(bad_buf, (void __user *)user_addr, + cache_size)) { + pr_warn("copy_from_user failed, but lacked Oops\n"); + goto free_user; + } + } + +free_user: + vm_munmap(user_addr, PAGE_SIZE); +free_alloc: + if (bad_buf) + kmem_cache_free(bad_cache, bad_buf); + kfree(good_buf); +} + +/* Callable tests. */ +void lkdtm_USERCOPY_HEAP_SIZE_TO(void) +{ + do_usercopy_heap_size(true); +} + +void lkdtm_USERCOPY_HEAP_SIZE_FROM(void) +{ + do_usercopy_heap_size(false); +} + +void lkdtm_USERCOPY_HEAP_FLAG_TO(void) +{ + do_usercopy_heap_flag(true); +} + +void lkdtm_USERCOPY_HEAP_FLAG_FROM(void) +{ + do_usercopy_heap_flag(false); +} + +void lkdtm_USERCOPY_STACK_FRAME_TO(void) +{ + do_usercopy_stack(true, true); +} + +void lkdtm_USERCOPY_STACK_FRAME_FROM(void) +{ + do_usercopy_stack(false, true); +} + +void lkdtm_USERCOPY_STACK_BEYOND(void) +{ + do_usercopy_stack(true, false); +} + +void lkdtm_USERCOPY_KERNEL(void) +{ + 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; + } + + pr_info("attempting good copy_to_user from kernel rodata\n"); + if (copy_to_user((void __user *)user_addr, test_text, + sizeof(test_text))) { + pr_warn("copy_to_user failed unexpectedly?!\n"); + goto free_user; + } + + pr_info("attempting bad copy_to_user from kernel text\n"); + if (copy_to_user((void __user *)user_addr, vm_mmap, PAGE_SIZE)) { + pr_warn("copy_to_user failed, but lacked Oops\n"); + goto free_user; + } + +free_user: + vm_munmap(user_addr, PAGE_SIZE); +} + +void __init lkdtm_usercopy_init(void) +{ + /* Prepare cache that lacks SLAB_USERCOPY flag. */ + bad_cache = kmem_cache_create("lkdtm-no-usercopy", cache_size, 0, + 0, NULL); +} + +void __exit lkdtm_usercopy_exit(void) +{ + kmem_cache_destroy(bad_cache); +} -- cgit v1.2.3