diff options
Diffstat (limited to 'tools/testing/selftests/bpf/progs/verifier_map_ptr.c')
| -rw-r--r-- | tools/testing/selftests/bpf/progs/verifier_map_ptr.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/verifier_map_ptr.c b/tools/testing/selftests/bpf/progs/verifier_map_ptr.c new file mode 100644 index 000000000000..11a079145966 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/verifier_map_ptr.c @@ -0,0 +1,159 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Converted from tools/testing/selftests/bpf/verifier/map_ptr.c */ + +#include <linux/bpf.h> +#include <bpf/bpf_helpers.h> +#include "bpf_misc.h" + +#define MAX_ENTRIES 11 + +struct test_val { + unsigned int index; + int foo[MAX_ENTRIES]; +}; + +struct { + __uint(type, BPF_MAP_TYPE_ARRAY); + __uint(max_entries, 1); + __type(key, int); + __type(value, struct test_val); +} map_array_48b SEC(".maps"); + +struct other_val { + long long foo; + long long bar; +}; + +struct { + __uint(type, BPF_MAP_TYPE_HASH); + __uint(max_entries, 1); + __type(key, long long); + __type(value, struct other_val); +} map_hash_16b SEC(".maps"); + +SEC("socket") +__description("bpf_map_ptr: read with negative offset rejected") +__failure __msg("R1 is bpf_array invalid negative access: off=-8") +__failure_unpriv +__msg_unpriv("access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN") +__naked void read_with_negative_offset_rejected(void) +{ + asm volatile (" \ + r1 = r10; \ + r1 = %[map_array_48b] ll; \ + r6 = *(u64*)(r1 - 8); \ + r0 = 1; \ + exit; \ +" : + : __imm_addr(map_array_48b) + : __clobber_all); +} + +SEC("socket") +__description("bpf_map_ptr: write rejected") +__failure __msg("only read from bpf_array is supported") +__failure_unpriv +__msg_unpriv("access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN") +__naked void bpf_map_ptr_write_rejected(void) +{ + asm volatile (" \ + r0 = 0; \ + *(u64*)(r10 - 8) = r0; \ + r2 = r10; \ + r2 += -8; \ + r1 = %[map_array_48b] ll; \ + *(u64*)(r1 + 0) = r2; \ + r0 = 1; \ + exit; \ +" : + : __imm_addr(map_array_48b) + : __clobber_all); +} + +SEC("socket") +__description("bpf_map_ptr: read non-existent field rejected") +__failure +__msg("cannot access ptr member ops with moff 0 in struct bpf_map with off 1 size 4") +__failure_unpriv +__msg_unpriv("access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN") +__flag(BPF_F_ANY_ALIGNMENT) +__naked void read_non_existent_field_rejected(void) +{ + asm volatile (" \ + r6 = 0; \ + r1 = %[map_array_48b] ll; \ + r6 = *(u32*)(r1 + 1); \ + r0 = 1; \ + exit; \ +" : + : __imm_addr(map_array_48b) + : __clobber_all); +} + +SEC("socket") +__description("bpf_map_ptr: read ops field accepted") +__success __failure_unpriv +__msg_unpriv("access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN") +__retval(1) +__naked void ptr_read_ops_field_accepted(void) +{ + asm volatile (" \ + r6 = 0; \ + r1 = %[map_array_48b] ll; \ + r6 = *(u64*)(r1 + 0); \ + r0 = 1; \ + exit; \ +" : + : __imm_addr(map_array_48b) + : __clobber_all); +} + +SEC("socket") +__description("bpf_map_ptr: r = 0, map_ptr = map_ptr + r") +__success __failure_unpriv +__msg_unpriv("R1 has pointer with unsupported alu operation") +__retval(0) +__naked void map_ptr_map_ptr_r(void) +{ + asm volatile (" \ + r0 = 0; \ + *(u64*)(r10 - 8) = r0; \ + r2 = r10; \ + r2 += -8; \ + r0 = 0; \ + r1 = %[map_hash_16b] ll; \ + r1 += r0; \ + call %[bpf_map_lookup_elem]; \ + r0 = 0; \ + exit; \ +" : + : __imm(bpf_map_lookup_elem), + __imm_addr(map_hash_16b) + : __clobber_all); +} + +SEC("socket") +__description("bpf_map_ptr: r = 0, r = r + map_ptr") +__success __failure_unpriv +__msg_unpriv("R0 has pointer with unsupported alu operation") +__retval(0) +__naked void _0_r_r_map_ptr(void) +{ + asm volatile (" \ + r0 = 0; \ + *(u64*)(r10 - 8) = r0; \ + r2 = r10; \ + r2 += -8; \ + r1 = 0; \ + r0 = %[map_hash_16b] ll; \ + r1 += r0; \ + call %[bpf_map_lookup_elem]; \ + r0 = 0; \ + exit; \ +" : + : __imm(bpf_map_lookup_elem), + __imm_addr(map_hash_16b) + : __clobber_all); +} + +char _license[] SEC("license") = "GPL"; |