misc/lkdtm/usercopy.c

1 // SPDX-License-Identifier: GPL-2.0
17  * into choosing the non-const path to make sure we trigger the
28  * Instead of adding -Wno-return-local-addr, just pass the stack address
51 	return trick_compiler(&buf[(128/2)-32]);  in do_usercopy_stack_callee()
71 		bad_stack -= sizeof(unsigned long);  in do_usercopy_stack()
77 	pr_info("good_stack: %px-%px\n", good_stack, good_stack + sizeof(good_stack));  in do_usercopy_stack()
78 	pr_info("bad_stack : %px-%px\n", bad_stack, bad_stack + sizeof(good_stack));  in do_usercopy_stack()
84 		pr_warn("Failed to allocate user memory\n");  in do_usercopy_stack()
130  * This checks for whole-object size validation with hardened usercopy,
136 	unsigned char *one, *two;  in do_usercopy_heap_size()  local
142 	two = kmalloc(size, GFP_KERNEL);  in do_usercopy_heap_size()
143 	if (!one || !two) {  in do_usercopy_heap_size()
152 		pr_warn("Failed to allocate user memory\n");  in do_usercopy_heap_size()
157 	memset(two, 'B', size);  in do_usercopy_heap_size()
192 	kfree(two);  in do_usercopy_heap_size()
221 	/* Allocate user memory we'll poke at. */  in do_usercopy_heap_whitelist()
226 		pr_warn("Failed to allocate user memory\n");  in do_usercopy_heap_whitelist()
245 		if (copy_to_user(user_addr, buf + offset - 1, size)) {  in do_usercopy_heap_whitelist()
257 		if (copy_from_user(buf + offset - 1, user_addr, size)) {  in do_usercopy_heap_whitelist()
314 		pr_warn("Failed to allocate user memory\n");  in lkdtm_USERCOPY_KERNEL()
343 		kmem_cache_create_usercopy("lkdtm-usercopy", cache_size,  in lkdtm_usercopy_init()