// SPDX-License-Identifier: GPL-2.0-only #include <kunit/test.h>struct bprm_stack_limits_result {struct linux_binprm bprm;int expected_rc;unsigned long expected_argmin;static const struct bprm_stack_limits_result bprm_stack_limits_results[] = {/* Negative argc/envc counts produce -E2BIG */ /* The max value of argc or envc is MAX_ARG_STRINGS. */ /* * On 32-bit system these argc and envc counts, while likely impossible * to represent within the associated TASK_SIZE, could overflow the * limit calculation, and bypass the ptr_size <= limit check. #ifdef CONFIG_MMU/* Make sure a pathological bprm->p doesn't cause an overflow. */ sizeof (void *), .rlim_stack.rlim_cur = ULONG_MAX,#endif /* * 0 rlim_stack will get raised to ARG_MAX. With 1 string pointer, * we should see p - ARG_MAX + sizeof(void *). sizeof (void *)},/* Validate that argc is always raised to a minimum of 1. */ sizeof (void *)},/* * 0 rlim_stack will get raised to ARG_MAX. With pointers filling ARG_MAX, * we should see -E2BIG. (Note argc is always raised to at least 1.) sizeof (void *), .envc = 0 }, .expected_rc = -E2BIG },sizeof (void *) - 1 }, .expected_rc = -E2BIG },sizeof (void *) + 1, .envc = 0 }, .expected_rc = -E2BIG },sizeof (void *) }, .expected_rc = -E2BIG },/* And with one less, we see space for exactly 1 pointer. */ sizeof (void *)) - 1, .envc = 0 },sizeof (void *) },sizeof (void *)) - 2, },sizeof (void *) },/* If we raise rlim_stack / 4 to exactly ARG_MAX, nothing changes. */ sizeof (void *), .envc = 0 }, .expected_rc = -E2BIG },sizeof (void *) - 1 }, .expected_rc = -E2BIG },sizeof (void *) + 1, .envc = 0 }, .expected_rc = -E2BIG },sizeof (void *) }, .expected_rc = -E2BIG },sizeof (void *)) - 1, .envc = 0 },sizeof (void *) },sizeof (void *)) - 2, },sizeof (void *) },/* But raising it another pointer * 4 will provide space for 1 more pointer. */ sizeof (void *)) * 4,sizeof (void *), .envc = 0 },sizeof (void *) },sizeof (void *)) * 4,sizeof (void *) - 1 },sizeof (void *) },/* Raising rlim_stack / 4 to _STK_LIM / 4 * 3 will see more space. */ sizeof (void *) },sizeof (void *) },/* But raising it any further will see no increase. */ sizeof (void *)),sizeof (void *) },sizeof (void *)),sizeof (void *) },sizeof (void *) },sizeof (void *) },static void exec_test_bprm_stack_limits(struct kunit *test)/* Double-check the constants. */ for (int i = 0; i < ARRAY_SIZE(bprm_stack_limits_results); i++) {const struct bprm_stack_limits_result *result = &bprm_stack_limits_results[i];struct linux_binprm bprm = result->bprm;int rc;"on loop %d" , i);#ifdef CONFIG_MMU"on loop %d" , i);#endif static struct kunit_case exec_test_cases[] = {static struct kunit_suite exec_test_suite = {"exec" ,
Messung V0.5 C=95 H=92 G=93
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