79 lines · c
1// SPDX-License-Identifier: GPL-2.02/* Converted from tools/testing/selftests/bpf/verifier/value_adj_spill.c */3 4#include <linux/bpf.h>5#include <bpf/bpf_helpers.h>6#include "bpf_misc.h"7 8#define MAX_ENTRIES 119 10struct test_val {11 unsigned int index;12 int foo[MAX_ENTRIES];13};14 15struct {16 __uint(type, BPF_MAP_TYPE_HASH);17 __uint(max_entries, 1);18 __type(key, long long);19 __type(value, struct test_val);20} map_hash_48b SEC(".maps");21 22SEC("socket")23__description("map element value is preserved across register spilling")24__success __failure_unpriv __msg_unpriv("R0 leaks addr")25__retval(0)26__naked void is_preserved_across_register_spilling(void)27{28 asm volatile (" \29 r2 = r10; \30 r2 += -8; \31 r1 = 0; \32 *(u64*)(r2 + 0) = r1; \33 r1 = %[map_hash_48b] ll; \34 call %[bpf_map_lookup_elem]; \35 if r0 == 0 goto l0_%=; \36 r1 = 42; \37 *(u64*)(r0 + 0) = r1; \38 r1 = r10; \39 r1 += -184; \40 *(u64*)(r1 + 0) = r0; \41 r3 = *(u64*)(r1 + 0); \42 r1 = 42; \43 *(u64*)(r3 + 0) = r1; \44l0_%=: exit; \45" :46 : __imm(bpf_map_lookup_elem),47 __imm_addr(map_hash_48b)48 : __clobber_all);49}50 51SEC("socket")52__description("map element value or null is marked on register spilling")53__success __failure_unpriv __msg_unpriv("R0 leaks addr")54__retval(0)55__naked void is_marked_on_register_spilling(void)56{57 asm volatile (" \58 r2 = r10; \59 r2 += -8; \60 r1 = 0; \61 *(u64*)(r2 + 0) = r1; \62 r1 = %[map_hash_48b] ll; \63 call %[bpf_map_lookup_elem]; \64 r1 = r10; \65 r1 += -152; \66 *(u64*)(r1 + 0) = r0; \67 if r0 == 0 goto l0_%=; \68 r3 = *(u64*)(r1 + 0); \69 r1 = 42; \70 *(u64*)(r3 + 0) = r1; \71l0_%=: exit; \72" :73 : __imm(bpf_map_lookup_elem),74 __imm_addr(map_hash_48b)75 : __clobber_all);76}77 78char _license[] SEC("license") = "GPL";79