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lkdtm: drop "alloc_size" parameter
There is no good reason to have the alloc_size parameter currently. The compiler-tricking value used to exercise the stack can just use a stack address instead. Similarly hard-code cache_size. Signed-off-by: Kees Cook <keescook@chromium.org>
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parent
6c3521400c
commit
0edca7b5af
1 changed files with 5 additions and 10 deletions
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@ -184,8 +184,6 @@ static char* cpoint_name;
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static char* cpoint_type;
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static int cpoint_count = DEFAULT_COUNT;
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static int recur_count = REC_NUM_DEFAULT;
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static int alloc_size = 1024;
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static size_t cache_size;
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static enum cname cpoint = CN_INVALID;
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static enum ctype cptype = CT_NONE;
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@ -194,6 +192,8 @@ static DEFINE_SPINLOCK(count_lock);
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static DEFINE_SPINLOCK(lock_me_up);
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static u8 data_area[EXEC_SIZE];
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static size_t cache_size = 1024;
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static struct kmem_cache *bad_cache;
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static const unsigned char test_text[] = "This is a test.\n";
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@ -210,9 +210,6 @@ MODULE_PARM_DESC(cpoint_type, " Crash Point Type, action to be taken on "\
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module_param(cpoint_count, int, 0644);
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MODULE_PARM_DESC(cpoint_count, " Crash Point Count, number of times the "\
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"crash point is to be hit to trigger action");
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module_param(alloc_size, int, 0644);
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MODULE_PARM_DESC(alloc_size, " Size of allocation for user copy tests "\
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"(from 1 to PAGE_SIZE)");
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static unsigned int jp_do_irq(unsigned int irq)
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{
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@ -441,7 +438,7 @@ static noinline void do_usercopy_stack(bool to_user, bool bad_frame)
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/* This is a pointer to outside our current stack frame. */
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if (bad_frame) {
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bad_stack = do_usercopy_stack_callee(alloc_size);
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bad_stack = do_usercopy_stack_callee((uintptr_t)bad_stack);
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} else {
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/* Put start address just inside stack. */
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bad_stack = task_stack_page(current) + THREAD_SIZE;
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@ -530,7 +527,7 @@ static void do_usercopy_heap_size(bool to_user)
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{
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unsigned long user_addr;
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unsigned char *one, *two;
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size_t size = clamp_t(int, alloc_size, 1, PAGE_SIZE);
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size_t size = 1024;
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one = kmalloc(size, GFP_KERNEL);
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two = kmalloc(size, GFP_KERNEL);
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@ -564,8 +561,7 @@ static void do_usercopy_heap_size(bool to_user)
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}
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} else {
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pr_info("attempting good copy_from_user of correct size\n");
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if (copy_from_user(one, (void __user *)user_addr,
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size)) {
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if (copy_from_user(one, (void __user *)user_addr, size)) {
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pr_warn("copy_from_user failed unexpectedly?!\n");
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goto free_user;
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}
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@ -1284,7 +1280,6 @@ static int __init lkdtm_module_init(void)
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ro_after_init |= 0xAA;
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/* Prepare cache that lacks SLAB_USERCOPY flag. */
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cache_size = clamp_t(int, alloc_size, 1, PAGE_SIZE);
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bad_cache = kmem_cache_create("lkdtm-no-usercopy", cache_size, 0,
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0, NULL);
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