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Diffstat (limited to 'tools/testing/selftests/bpf/test_verifier.c')
-rw-r--r--tools/testing/selftests/bpf/test_verifier.c215
1 files changed, 181 insertions, 34 deletions
diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index 477a9dcf9fff..ccd896b98cac 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -47,11 +47,13 @@
#include "bpf_rlimit.h"
#include "bpf_rand.h"
#include "bpf_util.h"
+#include "test_btf.h"
#include "../../../include/linux/filter.h"
#define MAX_INSNS BPF_MAXINSNS
+#define MAX_TEST_INSNS 1000000
#define MAX_FIXUPS 8
-#define MAX_NR_MAPS 14
+#define MAX_NR_MAPS 18
#define MAX_TEST_RUNS 8
#define POINTER_VALUE 0xcafe4all
#define TEST_DATA_LEN 64
@@ -66,6 +68,7 @@ static int skips;
struct bpf_test {
const char *descr;
struct bpf_insn insns[MAX_INSNS];
+ struct bpf_insn *fill_insns;
int fixup_map_hash_8b[MAX_FIXUPS];
int fixup_map_hash_48b[MAX_FIXUPS];
int fixup_map_hash_16b[MAX_FIXUPS];
@@ -80,9 +83,14 @@ struct bpf_test {
int fixup_cgroup_storage[MAX_FIXUPS];
int fixup_percpu_cgroup_storage[MAX_FIXUPS];
int fixup_map_spin_lock[MAX_FIXUPS];
+ int fixup_map_array_ro[MAX_FIXUPS];
+ int fixup_map_array_wo[MAX_FIXUPS];
+ int fixup_map_array_small[MAX_FIXUPS];
+ int fixup_sk_storage_map[MAX_FIXUPS];
const char *errstr;
const char *errstr_unpriv;
uint32_t retval, retval_unpriv, insn_processed;
+ int prog_len;
enum {
UNDEF,
ACCEPT,
@@ -119,10 +127,11 @@ struct other_val {
static void bpf_fill_ld_abs_vlan_push_pop(struct bpf_test *self)
{
- /* test: {skb->data[0], vlan_push} x 68 + {skb->data[0], vlan_pop} x 68 */
+ /* test: {skb->data[0], vlan_push} x 51 + {skb->data[0], vlan_pop} x 51 */
#define PUSH_CNT 51
- unsigned int len = BPF_MAXINSNS;
- struct bpf_insn *insn = self->insns;
+ /* jump range is limited to 16 bit. PUSH_CNT of ld_abs needs room */
+ unsigned int len = (1 << 15) - PUSH_CNT * 2 * 5 * 6;
+ struct bpf_insn *insn = self->fill_insns;
int i = 0, j, k = 0;
insn[i++] = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1);
@@ -156,12 +165,14 @@ loop:
for (; i < len - 1; i++)
insn[i] = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, 0xbef);
insn[len - 1] = BPF_EXIT_INSN();
+ self->prog_len = len;
}
static void bpf_fill_jump_around_ld_abs(struct bpf_test *self)
{
- struct bpf_insn *insn = self->insns;
- unsigned int len = BPF_MAXINSNS;
+ struct bpf_insn *insn = self->fill_insns;
+ /* jump range is limited to 16 bit. every ld_abs is replaced by 6 insns */
+ unsigned int len = (1 << 15) / 6;
int i = 0;
insn[i++] = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1);
@@ -171,11 +182,12 @@ static void bpf_fill_jump_around_ld_abs(struct bpf_test *self)
while (i < len - 1)
insn[i++] = BPF_LD_ABS(BPF_B, 1);
insn[i] = BPF_EXIT_INSN();
+ self->prog_len = i + 1;
}
static void bpf_fill_rand_ld_dw(struct bpf_test *self)
{
- struct bpf_insn *insn = self->insns;
+ struct bpf_insn *insn = self->fill_insns;
uint64_t res = 0;
int i = 0;
@@ -193,12 +205,83 @@ static void bpf_fill_rand_ld_dw(struct bpf_test *self)
insn[i++] = BPF_ALU64_IMM(BPF_RSH, BPF_REG_1, 32);
insn[i++] = BPF_ALU64_REG(BPF_XOR, BPF_REG_0, BPF_REG_1);
insn[i] = BPF_EXIT_INSN();
+ self->prog_len = i + 1;
res ^= (res >> 32);
self->retval = (uint32_t)res;
}
+/* test the sequence of 1k jumps */
+static void bpf_fill_scale1(struct bpf_test *self)
+{
+ struct bpf_insn *insn = self->fill_insns;
+ int i = 0, k = 0;
+
+ insn[i++] = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1);
+ /* test to check that the sequence of 1024 jumps is acceptable */
+ while (k++ < 1024) {
+ insn[i++] = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+ BPF_FUNC_get_prandom_u32);
+ insn[i++] = BPF_JMP_IMM(BPF_JGT, BPF_REG_0, bpf_semi_rand_get(), 2);
+ insn[i++] = BPF_MOV64_REG(BPF_REG_1, BPF_REG_10);
+ insn[i++] = BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_6,
+ -8 * (k % 64 + 1));
+ }
+ /* every jump adds 1024 steps to insn_processed, so to stay exactly
+ * within 1m limit add MAX_TEST_INSNS - 1025 MOVs and 1 EXIT
+ */
+ while (i < MAX_TEST_INSNS - 1025)
+ insn[i++] = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, 42);
+ insn[i] = BPF_EXIT_INSN();
+ self->prog_len = i + 1;
+ self->retval = 42;
+}
+
+/* test the sequence of 1k jumps in inner most function (function depth 8)*/
+static void bpf_fill_scale2(struct bpf_test *self)
+{
+ struct bpf_insn *insn = self->fill_insns;
+ int i = 0, k = 0;
+
+#define FUNC_NEST 7
+ for (k = 0; k < FUNC_NEST; k++) {
+ insn[i++] = BPF_CALL_REL(1);
+ insn[i++] = BPF_EXIT_INSN();
+ }
+ insn[i++] = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1);
+ /* test to check that the sequence of 1024 jumps is acceptable */
+ while (k++ < 1024) {
+ insn[i++] = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+ BPF_FUNC_get_prandom_u32);
+ insn[i++] = BPF_JMP_IMM(BPF_JGT, BPF_REG_0, bpf_semi_rand_get(), 2);
+ insn[i++] = BPF_MOV64_REG(BPF_REG_1, BPF_REG_10);
+ insn[i++] = BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_6,
+ -8 * (k % (64 - 4 * FUNC_NEST) + 1));
+ }
+ /* every jump adds 1024 steps to insn_processed, so to stay exactly
+ * within 1m limit add MAX_TEST_INSNS - 1025 MOVs and 1 EXIT
+ */
+ while (i < MAX_TEST_INSNS - 1025)
+ insn[i++] = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, 42);
+ insn[i] = BPF_EXIT_INSN();
+ self->prog_len = i + 1;
+ self->retval = 42;
+}
+
+static void bpf_fill_scale(struct bpf_test *self)
+{
+ switch (self->retval) {
+ case 1:
+ return bpf_fill_scale1(self);
+ case 2:
+ return bpf_fill_scale2(self);
+ default:
+ self->prog_len = 0;
+ break;
+ }
+}
+
/* BPF_SK_LOOKUP contains 13 instructions, if you need to fix up maps */
-#define BPF_SK_LOOKUP \
+#define BPF_SK_LOOKUP(func) \
/* struct bpf_sock_tuple tuple = {} */ \
BPF_MOV64_IMM(BPF_REG_2, 0), \
BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_2, -8), \
@@ -207,13 +290,13 @@ static void bpf_fill_rand_ld_dw(struct bpf_test *self)
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -32), \
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -40), \
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -48), \
- /* sk = sk_lookup_tcp(ctx, &tuple, sizeof tuple, 0, 0) */ \
+ /* sk = func(ctx, &tuple, sizeof tuple, 0, 0) */ \
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10), \
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -48), \
BPF_MOV64_IMM(BPF_REG_3, sizeof(struct bpf_sock_tuple)), \
BPF_MOV64_IMM(BPF_REG_4, 0), \
BPF_MOV64_IMM(BPF_REG_5, 0), \
- BPF_EMIT_CALL(BPF_FUNC_sk_lookup_tcp)
+ BPF_EMIT_CALL(BPF_FUNC_ ## func)
/* BPF_DIRECT_PKT_R2 contains 7 instructions, it initializes default return
* value into 0 and does necessary preparation for direct packet access
@@ -277,13 +360,15 @@ static bool skip_unsupported_map(enum bpf_map_type map_type)
return false;
}
-static int create_map(uint32_t type, uint32_t size_key,
- uint32_t size_value, uint32_t max_elem)
+static int __create_map(uint32_t type, uint32_t size_key,
+ uint32_t size_value, uint32_t max_elem,
+ uint32_t extra_flags)
{
int fd;
fd = bpf_create_map(type, size_key, size_value, max_elem,
- type == BPF_MAP_TYPE_HASH ? BPF_F_NO_PREALLOC : 0);
+ (type == BPF_MAP_TYPE_HASH ?
+ BPF_F_NO_PREALLOC : 0) | extra_flags);
if (fd < 0) {
if (skip_unsupported_map(type))
return -1;
@@ -293,6 +378,12 @@ static int create_map(uint32_t type, uint32_t size_key,
return fd;
}
+static int create_map(uint32_t type, uint32_t size_key,
+ uint32_t size_value, uint32_t max_elem)
+{
+ return __create_map(type, size_key, size_value, max_elem, 0);
+}
+
static void update_map(int fd, int index)
{
struct test_val value = {
@@ -408,24 +499,6 @@ static int create_cgroup_storage(bool percpu)
return fd;
}
-#define BTF_INFO_ENC(kind, kind_flag, vlen) \
- ((!!(kind_flag) << 31) | ((kind) << 24) | ((vlen) & BTF_MAX_VLEN))
-#define BTF_TYPE_ENC(name, info, size_or_type) \
- (name), (info), (size_or_type)
-#define BTF_INT_ENC(encoding, bits_offset, nr_bits) \
- ((encoding) << 24 | (bits_offset) << 16 | (nr_bits))
-#define BTF_TYPE_INT_ENC(name, encoding, bits_offset, bits, sz) \
- BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_INT, 0, 0), sz), \
- BTF_INT_ENC(encoding, bits_offset, bits)
-#define BTF_MEMBER_ENC(name, type, bits_offset) \
- (name), (type), (bits_offset)
-
-struct btf_raw_data {
- __u32 raw_types[64];
- const char *str_sec;
- __u32 str_sec_size;
-};
-
/* struct bpf_spin_lock {
* int val;
* };
@@ -500,6 +573,31 @@ static int create_map_spin_lock(void)
return fd;
}
+static int create_sk_storage_map(void)
+{
+ struct bpf_create_map_attr attr = {
+ .name = "test_map",
+ .map_type = BPF_MAP_TYPE_SK_STORAGE,
+ .key_size = 4,
+ .value_size = 8,
+ .max_entries = 0,
+ .map_flags = BPF_F_NO_PREALLOC,
+ .btf_key_type_id = 1,
+ .btf_value_type_id = 3,
+ };
+ int fd, btf_fd;
+
+ btf_fd = load_btf();
+ if (btf_fd < 0)
+ return -1;
+ attr.btf_fd = btf_fd;
+ fd = bpf_create_map_xattr(&attr);
+ close(attr.btf_fd);
+ if (fd < 0)
+ printf("Failed to create sk_storage_map\n");
+ return fd;
+}
+
static char bpf_vlog[UINT_MAX >> 8];
static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type,
@@ -519,9 +617,15 @@ static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type,
int *fixup_cgroup_storage = test->fixup_cgroup_storage;
int *fixup_percpu_cgroup_storage = test->fixup_percpu_cgroup_storage;
int *fixup_map_spin_lock = test->fixup_map_spin_lock;
+ int *fixup_map_array_ro = test->fixup_map_array_ro;
+ int *fixup_map_array_wo = test->fixup_map_array_wo;
+ int *fixup_map_array_small = test->fixup_map_array_small;
+ int *fixup_sk_storage_map = test->fixup_sk_storage_map;
- if (test->fill_helper)
+ if (test->fill_helper) {
+ test->fill_insns = calloc(MAX_TEST_INSNS, sizeof(struct bpf_insn));
test->fill_helper(test);
+ }
/* Allocating HTs with 1 elem is fine here, since we only test
* for verifier and not do a runtime lookup, so the only thing
@@ -642,6 +746,42 @@ static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type,
fixup_map_spin_lock++;
} while (*fixup_map_spin_lock);
}
+ if (*fixup_map_array_ro) {
+ map_fds[14] = __create_map(BPF_MAP_TYPE_ARRAY, sizeof(int),
+ sizeof(struct test_val), 1,
+ BPF_F_RDONLY_PROG);
+ update_map(map_fds[14], 0);
+ do {
+ prog[*fixup_map_array_ro].imm = map_fds[14];
+ fixup_map_array_ro++;
+ } while (*fixup_map_array_ro);
+ }
+ if (*fixup_map_array_wo) {
+ map_fds[15] = __create_map(BPF_MAP_TYPE_ARRAY, sizeof(int),
+ sizeof(struct test_val), 1,
+ BPF_F_WRONLY_PROG);
+ update_map(map_fds[15], 0);
+ do {
+ prog[*fixup_map_array_wo].imm = map_fds[15];
+ fixup_map_array_wo++;
+ } while (*fixup_map_array_wo);
+ }
+ if (*fixup_map_array_small) {
+ map_fds[16] = __create_map(BPF_MAP_TYPE_ARRAY, sizeof(int),
+ 1, 1, 0);
+ update_map(map_fds[16], 0);
+ do {
+ prog[*fixup_map_array_small].imm = map_fds[16];
+ fixup_map_array_small++;
+ } while (*fixup_map_array_small);
+ }
+ if (*fixup_sk_storage_map) {
+ map_fds[17] = create_sk_storage_map();
+ do {
+ prog[*fixup_sk_storage_map].imm = map_fds[17];
+ fixup_sk_storage_map++;
+ } while (*fixup_sk_storage_map);
+ }
}
static int set_admin(bool admin)
@@ -718,12 +858,17 @@ static void do_test_single(struct bpf_test *test, bool unpriv,
prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
fixup_skips = skips;
do_test_fixup(test, prog_type, prog, map_fds);
+ if (test->fill_insns) {
+ prog = test->fill_insns;
+ prog_len = test->prog_len;
+ } else {
+ prog_len = probe_filter_length(prog);
+ }
/* If there were some map skips during fixup due to missing bpf
* features, skip this test.
*/
if (fixup_skips != skips)
return;
- prog_len = probe_filter_length(prog);
pflags = 0;
if (test->flags & F_LOAD_WITH_STRICT_ALIGNMENT)
@@ -731,7 +876,7 @@ static void do_test_single(struct bpf_test *test, bool unpriv,
if (test->flags & F_NEEDS_EFFICIENT_UNALIGNED_ACCESS)
pflags |= BPF_F_ANY_ALIGNMENT;
fd_prog = bpf_verify_program(prog_type, prog, prog_len, pflags,
- "GPL", 0, bpf_vlog, sizeof(bpf_vlog), 1);
+ "GPL", 0, bpf_vlog, sizeof(bpf_vlog), 4);
if (fd_prog < 0 && !bpf_probe_prog_type(prog_type, 0)) {
printf("SKIP (unsupported program type %d)\n", prog_type);
skips++;
@@ -830,6 +975,8 @@ static void do_test_single(struct bpf_test *test, bool unpriv,
goto fail_log;
}
close_fds:
+ if (test->fill_insns)
+ free(test->fill_insns);
close(fd_prog);
for (i = 0; i < MAX_NR_MAPS; i++)
close(map_fds[i]);