linux/tools/testing/selftests/bpf/progs/verifier_direct_stack_access_wraparound.c

// SPDX-License-Identifier: GPL-2.0
/* Converted from tools/testing/selftests/bpf/verifier/direct_stack_access_wraparound.c */

#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"

SEC("socket")
__description("direct stack access with 32-bit wraparound. test1")
__failure __msg("fp pointer and 2147483647")
__failure_unpriv
__naked void with_32_bit_wraparound_test1(void)
{
	asm volatile ("					\
	r1 = r10;					\
	r1 += 0x7fffffff;				\
	r1 += 0x7fffffff;				\
	w0 = 0;						\
	*(u8*)(r1 + 0) = r0;				\
	exit;						\
"	::: __clobber_all);
}

SEC("socket")
__description("direct stack access with 32-bit wraparound. test2")
__failure __msg("fp pointer and 1073741823")
__failure_unpriv
__naked void with_32_bit_wraparound_test2(void)
{
	asm volatile ("					\
	r1 = r10;					\
	r1 += 0x3fffffff;				\
	r1 += 0x3fffffff;				\
	w0 = 0;						\
	*(u8*)(r1 + 0) = r0;				\
	exit;						\
"	::: __clobber_all);
}

SEC("socket")
__description("direct stack access with 32-bit wraparound. test3")
__failure __msg("fp pointer offset 1073741822")
__msg_unpriv("R1 stack pointer arithmetic goes out of range")
__naked void with_32_bit_wraparound_test3(void)
{
	asm volatile ("					\
	r1 = r10;					\
	r1 += 0x1fffffff;				\
	r1 += 0x1fffffff;				\
	w0 = 0;						\
	*(u8*)(r1 + 0) = r0;				\
	exit;						\
"	::: __clobber_all);
}

char _license[] SEC("license") = "GPL";