// SPDX-License-Identifier: GPL-2.0 /* Converted from tools/testing/selftests/bpf/verifier/value_or_null.c */ #include #include #include "bpf_misc.h" #define MAX_ENTRIES 11 struct test_val { unsigned int index; int foo[MAX_ENTRIES]; }; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 1); __type(key, long long); __type(value, struct test_val); } map_hash_48b SEC(".maps"); 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("tc") __description("multiple registers share map_lookup_elem result") __success __retval(0) __naked void share_map_lookup_elem_result(void) { asm volatile (" \ r1 = 10; \ *(u64*)(r10 - 8) = r1; \ r2 = r10; \ r2 += -8; \ r1 = %[map_hash_8b] ll; \ call %[bpf_map_lookup_elem]; \ r4 = r0; \ if r0 == 0 goto l0_%=; \ r1 = 0; \ *(u64*)(r4 + 0) = r1; \ l0_%=: exit; \ " : : __imm(bpf_map_lookup_elem), __imm_addr(map_hash_8b) : __clobber_all); } SEC("tc") __description("alu ops on ptr_to_map_value_or_null, 1") __failure __msg("R4 pointer arithmetic on map_value_or_null") __naked void map_value_or_null_1(void) { asm volatile (" \ r1 = 10; \ *(u64*)(r10 - 8) = r1; \ r2 = r10; \ r2 += -8; \ r1 = %[map_hash_8b] ll; \ call %[bpf_map_lookup_elem]; \ r4 = r0; \ r4 += -2; \ r4 += 2; \ if r0 == 0 goto l0_%=; \ r1 = 0; \ *(u64*)(r4 + 0) = r1; \ l0_%=: exit; \ " : : __imm(bpf_map_lookup_elem), __imm_addr(map_hash_8b) : __clobber_all); } SEC("tc") __description("alu ops on ptr_to_map_value_or_null, 2") __failure __msg("R4 pointer arithmetic on map_value_or_null") __naked void map_value_or_null_2(void) { asm volatile (" \ r1 = 10; \ *(u64*)(r10 - 8) = r1; \ r2 = r10; \ r2 += -8; \ r1 = %[map_hash_8b] ll; \ call %[bpf_map_lookup_elem]; \ r4 = r0; \ r4 &= -1; \ if r0 == 0 goto l0_%=; \ r1 = 0; \ *(u64*)(r4 + 0) = r1; \ l0_%=: exit; \ " : : __imm(bpf_map_lookup_elem), __imm_addr(map_hash_8b) : __clobber_all); } SEC("tc") __description("alu ops on ptr_to_map_value_or_null, 3") __failure __msg("R4 pointer arithmetic on map_value_or_null") __naked void map_value_or_null_3(void) { asm volatile (" \ r1 = 10; \ *(u64*)(r10 - 8) = r1; \ r2 = r10; \ r2 += -8; \ r1 = %[map_hash_8b] ll; \ call %[bpf_map_lookup_elem]; \ r4 = r0; \ r4 <<= 1; \ if r0 == 0 goto l0_%=; \ r1 = 0; \ *(u64*)(r4 + 0) = r1; \ l0_%=: exit; \ " : : __imm(bpf_map_lookup_elem), __imm_addr(map_hash_8b) : __clobber_all); } SEC("tc") __description("invalid memory access with multiple map_lookup_elem calls") __failure __msg("R4 !read_ok") __naked void multiple_map_lookup_elem_calls(void) { asm volatile (" \ r1 = 10; \ *(u64*)(r10 - 8) = r1; \ r2 = r10; \ r2 += -8; \ r1 = %[map_hash_8b] ll; \ r8 = r1; \ r7 = r2; \ call %[bpf_map_lookup_elem]; \ r4 = r0; \ r1 = r8; \ r2 = r7; \ call %[bpf_map_lookup_elem]; \ if r0 == 0 goto l0_%=; \ r1 = 0; \ *(u64*)(r4 + 0) = r1; \ l0_%=: exit; \ " : : __imm(bpf_map_lookup_elem), __imm_addr(map_hash_8b) : __clobber_all); } SEC("tc") __description("valid indirect map_lookup_elem access with 2nd lookup in branch") __success __retval(0) __naked void with_2nd_lookup_in_branch(void) { asm volatile (" \ r1 = 10; \ *(u64*)(r10 - 8) = r1; \ r2 = r10; \ r2 += -8; \ r1 = %[map_hash_8b] ll; \ r8 = r1; \ r7 = r2; \ call %[bpf_map_lookup_elem]; \ r2 = 10; \ if r2 != 0 goto l0_%=; \ r1 = r8; \ r2 = r7; \ call %[bpf_map_lookup_elem]; \ l0_%=: r4 = r0; \ if r0 == 0 goto l1_%=; \ r1 = 0; \ *(u64*)(r4 + 0) = r1; \ l1_%=: exit; \ " : : __imm(bpf_map_lookup_elem), __imm_addr(map_hash_8b) : __clobber_all); } SEC("socket") __description("invalid map access from else condition") __failure __msg("R0 unbounded memory access") __failure_unpriv __msg_unpriv("R0 leaks addr") __flag(BPF_F_ANY_ALIGNMENT) __naked void map_access_from_else_condition(void) { asm volatile (" \ r1 = 0; \ *(u64*)(r10 - 8) = r1; \ r2 = r10; \ r2 += -8; \ r1 = %[map_hash_48b] ll; \ call %[bpf_map_lookup_elem]; \ if r0 == 0 goto l0_%=; \ r1 = *(u32*)(r0 + 0); \ if r1 >= %[__imm_0] goto l1_%=; \ r1 += 1; \ l1_%=: r1 <<= 2; \ r0 += r1; \ r1 = %[test_val_foo]; \ *(u64*)(r0 + 0) = r1; \ l0_%=: exit; \ " : : __imm(bpf_map_lookup_elem), __imm_addr(map_hash_48b), __imm_const(__imm_0, MAX_ENTRIES-1), __imm_const(test_val_foo, offsetof(struct test_val, foo)) : __clobber_all); } SEC("tc") __description("map lookup and null branch prediction") __success __retval(0) __naked void lookup_and_null_branch_prediction(void) { asm volatile (" \ r1 = 10; \ *(u64*)(r10 - 8) = r1; \ r2 = r10; \ r2 += -8; \ r1 = %[map_hash_8b] ll; \ call %[bpf_map_lookup_elem]; \ r6 = r0; \ if r6 == 0 goto l0_%=; \ if r6 != 0 goto l0_%=; \ r10 += 10; \ l0_%=: exit; \ " : : __imm(bpf_map_lookup_elem), __imm_addr(map_hash_8b) : __clobber_all); } SEC("cgroup/skb") __description("MAP_VALUE_OR_NULL check_ids() in regsafe()") __failure __msg("R8 invalid mem access 'map_value_or_null'") __failure_unpriv __msg_unpriv("") __flag(BPF_F_TEST_STATE_FREQ) __naked void null_check_ids_in_regsafe(void) { asm volatile (" \ r1 = 0; \ *(u64*)(r10 - 8) = r1; \ /* r9 = map_lookup_elem(...) */ \ r2 = r10; \ r2 += -8; \ r1 = %[map_hash_8b] ll; \ call %[bpf_map_lookup_elem]; \ r9 = r0; \ /* r8 = map_lookup_elem(...) */ \ r2 = r10; \ r2 += -8; \ r1 = %[map_hash_8b] ll; \ call %[bpf_map_lookup_elem]; \ r8 = r0; \ /* r7 = ktime_get_ns() */ \ call %[bpf_ktime_get_ns]; \ r7 = r0; \ /* r6 = ktime_get_ns() */ \ call %[bpf_ktime_get_ns]; \ r6 = r0; \ /* if r6 > r7 goto +1 ; no new information about the state is derived from\ * ; this check, thus produced verifier states differ\ * ; only in 'insn_idx' \ * r9 = r8 ; optionally share ID between r9 and r8\ */ \ if r6 > r7 goto l0_%=; \ r9 = r8; \ l0_%=: /* if r9 == 0 goto */ \ if r9 == 0 goto l1_%=; \ /* read map value via r8, this is not always \ * safe because r8 might be not equal to r9. \ */ \ r0 = *(u64*)(r8 + 0); \ l1_%=: /* exit 0 */ \ r0 = 0; \ exit; \ " : : __imm(bpf_ktime_get_ns), __imm(bpf_map_lookup_elem), __imm_addr(map_hash_8b) : __clobber_all); } char _license[] SEC("license") = "GPL";