// SPDX-License-Identifier: GPL-2.0 /* Converted from tools/testing/selftests/bpf/verifier/basic_stack.c */ #include <linux/bpf.h> #include <bpf/bpf_helpers.h> #include "bpf_misc.h" struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 1); __type(key, long long); __type(value, long long); } map_hash_8b SEC(".maps"); SEC("socket") __description("stack out of bounds") __failure __msg("invalid write to stack") __failure_unpriv __naked void stack_out_of_bounds(void) { asm volatile (" \ r1 = 0; \ *(u64*)(r10 + 8) = r1; \ exit; \ " ::: __clobber_all); } SEC("socket") __description("uninitialized stack1") __success __log_level(4) __msg("stack depth 8") __failure_unpriv __msg_unpriv("invalid read from stack") __naked void uninitialized_stack1(void) { asm volatile (" \ r2 = r10; \ r2 += -8; \ r1 = %[map_hash_8b] ll; \ call %[bpf_map_lookup_elem]; \ exit; \ " : : __imm(bpf_map_lookup_elem), __imm_addr(map_hash_8b) : __clobber_all); } SEC("socket") __description("uninitialized stack2") __success __log_level(4) __msg("stack depth 8") __failure_unpriv __msg_unpriv("invalid read from stack") __naked void uninitialized_stack2(void) { asm volatile (" \ r2 = r10; \ r0 = *(u64*)(r2 - 8); \ exit; \ " ::: __clobber_all); } SEC("socket") __description("invalid fp arithmetic") __failure __msg("R1 subtraction from stack pointer") __failure_unpriv __naked void invalid_fp_arithmetic(void) { /* If this gets ever changed, make sure JITs can deal with it. */ asm volatile (" \ r0 = 0; \ r1 = r10; \ r1 -= 8; \ *(u64*)(r1 + 0) = r0; \ exit; \ " ::: __clobber_all); } SEC("socket") __description("non-invalid fp arithmetic") __success __success_unpriv __retval(0) __naked void non_invalid_fp_arithmetic(void) { asm volatile (" \ r0 = 0; \ *(u64*)(r10 - 8) = r0; \ exit; \ " ::: __clobber_all); } SEC("socket") __description("misaligned read from stack") __failure __msg("misaligned stack access") __failure_unpriv __naked void misaligned_read_from_stack(void) { asm volatile (" \ r2 = r10; \ r0 = *(u64*)(r2 - 4); \ exit; \ " ::: __clobber_all); } char _license[] SEC("license") = "GPL";