101 lines · c
1// SPDX-License-Identifier: GPL-2.02/* Converted from tools/testing/selftests/bpf/verifier/basic_stack.c */3 4#include <linux/bpf.h>5#include <bpf/bpf_helpers.h>6#include "bpf_misc.h"7 8struct {9 __uint(type, BPF_MAP_TYPE_HASH);10 __uint(max_entries, 1);11 __type(key, long long);12 __type(value, long long);13} map_hash_8b SEC(".maps");14 15SEC("socket")16__description("stack out of bounds")17__failure __msg("invalid write to stack")18__failure_unpriv19__naked void stack_out_of_bounds(void)20{21 asm volatile (" \22 r1 = 0; \23 *(u64*)(r10 + 8) = r1; \24 exit; \25" ::: __clobber_all);26}27 28SEC("socket")29__description("uninitialized stack1")30__success __log_level(4) __msg("stack depth 8")31__failure_unpriv __msg_unpriv("invalid indirect read from stack")32__naked void uninitialized_stack1(void)33{34 asm volatile (" \35 r2 = r10; \36 r2 += -8; \37 r1 = %[map_hash_8b] ll; \38 call %[bpf_map_lookup_elem]; \39 exit; \40" :41 : __imm(bpf_map_lookup_elem),42 __imm_addr(map_hash_8b)43 : __clobber_all);44}45 46SEC("socket")47__description("uninitialized stack2")48__success __log_level(4) __msg("stack depth 8")49__failure_unpriv __msg_unpriv("invalid read from stack")50__naked void uninitialized_stack2(void)51{52 asm volatile (" \53 r2 = r10; \54 r0 = *(u64*)(r2 - 8); \55 exit; \56" ::: __clobber_all);57}58 59SEC("socket")60__description("invalid fp arithmetic")61__failure __msg("R1 subtraction from stack pointer")62__failure_unpriv63__naked void invalid_fp_arithmetic(void)64{65 /* If this gets ever changed, make sure JITs can deal with it. */66 asm volatile (" \67 r0 = 0; \68 r1 = r10; \69 r1 -= 8; \70 *(u64*)(r1 + 0) = r0; \71 exit; \72" ::: __clobber_all);73}74 75SEC("socket")76__description("non-invalid fp arithmetic")77__success __success_unpriv __retval(0)78__naked void non_invalid_fp_arithmetic(void)79{80 asm volatile (" \81 r0 = 0; \82 *(u64*)(r10 - 8) = r0; \83 exit; \84" ::: __clobber_all);85}86 87SEC("socket")88__description("misaligned read from stack")89__failure __msg("misaligned stack access")90__failure_unpriv91__naked void misaligned_read_from_stack(void)92{93 asm volatile (" \94 r2 = r10; \95 r0 = *(u64*)(r2 - 4); \96 exit; \97" ::: __clobber_all);98}99 100char _license[] SEC("license") = "GPL";101