1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Testsuite for eBPF verifier
   4 *
   5 * Copyright (c) 2014 PLUMgrid, http://plumgrid.com
   6 * Copyright (c) 2017 Facebook
   7 * Copyright (c) 2018 Covalent IO, Inc. http://covalent.io
 
 
   8 */
   9
  10#include <endian.h>
  11#include <asm/types.h>
  12#include <linux/types.h>
  13#include <stdint.h>
  14#include <stdio.h>
  15#include <stdlib.h>
  16#include <unistd.h>
  17#include <errno.h>
  18#include <string.h>
  19#include <stddef.h>
  20#include <stdbool.h>
  21#include <sched.h>
  22#include <limits.h>
  23#include <assert.h>
  24
  25#include <linux/unistd.h>
  26#include <linux/filter.h>
  27#include <linux/bpf_perf_event.h>
  28#include <linux/bpf.h>
  29#include <linux/if_ether.h>
  30#include <linux/btf.h>
  31
  32#include <bpf/btf.h>
  33#include <bpf/bpf.h>
  34#include <bpf/libbpf.h>
  35
  36#include "autoconf_helper.h"
  37#include "unpriv_helpers.h"
  38#include "cap_helpers.h"
  39#include "bpf_rand.h"
  40#include "bpf_util.h"
  41#include "test_btf.h"
  42#include "../../../include/linux/filter.h"
  43#include "testing_helpers.h"
  44
  45#define MAX_INSNS	BPF_MAXINSNS
  46#define MAX_EXPECTED_INSNS	32
  47#define MAX_UNEXPECTED_INSNS	32
  48#define MAX_TEST_INSNS	1000000
 
 
 
  49#define MAX_FIXUPS	8
  50#define MAX_NR_MAPS	23
  51#define MAX_TEST_RUNS	8
  52#define POINTER_VALUE	0xcafe4all
  53#define TEST_DATA_LEN	64
  54#define MAX_FUNC_INFOS	8
  55#define MAX_BTF_STRINGS	256
  56#define MAX_BTF_TYPES	256
  57
  58#define INSN_OFF_MASK	((__s16)0xFFFF)
  59#define INSN_IMM_MASK	((__s32)0xFFFFFFFF)
  60#define SKIP_INSNS()	BPF_RAW_INSN(0xde, 0xa, 0xd, 0xbeef, 0xdeadbeef)
  61
  62#define DEFAULT_LIBBPF_LOG_LEVEL	4
  63
  64#define F_NEEDS_EFFICIENT_UNALIGNED_ACCESS	(1 << 0)
  65#define F_LOAD_WITH_STRICT_ALIGNMENT		(1 << 1)
  66#define F_NEEDS_JIT_ENABLED			(1 << 2)
  67
  68/* need CAP_BPF, CAP_NET_ADMIN, CAP_PERFMON to load progs */
  69#define ADMIN_CAPS (1ULL << CAP_NET_ADMIN |	\
  70		    1ULL << CAP_PERFMON |	\
  71		    1ULL << CAP_BPF)
  72#define UNPRIV_SYSCTL "kernel/unprivileged_bpf_disabled"
  73static bool unpriv_disabled = false;
  74static bool jit_disabled;
  75static int skips;
  76static bool verbose = false;
  77static int verif_log_level = 0;
  78
  79struct kfunc_btf_id_pair {
  80	const char *kfunc;
  81	int insn_idx;
  82};
  83
  84struct bpf_test {
  85	const char *descr;
  86	struct bpf_insn	insns[MAX_INSNS];
  87	struct bpf_insn	*fill_insns;
  88	/* If specified, test engine looks for this sequence of
  89	 * instructions in the BPF program after loading. Allows to
  90	 * test rewrites applied by verifier.  Use values
  91	 * INSN_OFF_MASK and INSN_IMM_MASK to mask `off` and `imm`
  92	 * fields if content does not matter.  The test case fails if
  93	 * specified instructions are not found.
  94	 *
  95	 * The sequence could be split into sub-sequences by adding
  96	 * SKIP_INSNS instruction at the end of each sub-sequence. In
  97	 * such case sub-sequences are searched for one after another.
  98	 */
  99	struct bpf_insn expected_insns[MAX_EXPECTED_INSNS];
 100	/* If specified, test engine applies same pattern matching
 101	 * logic as for `expected_insns`. If the specified pattern is
 102	 * matched test case is marked as failed.
 103	 */
 104	struct bpf_insn unexpected_insns[MAX_UNEXPECTED_INSNS];
 105	int fixup_map_hash_8b[MAX_FIXUPS];
 106	int fixup_map_hash_48b[MAX_FIXUPS];
 107	int fixup_map_hash_16b[MAX_FIXUPS];
 108	int fixup_map_array_48b[MAX_FIXUPS];
 109	int fixup_map_sockmap[MAX_FIXUPS];
 110	int fixup_map_sockhash[MAX_FIXUPS];
 111	int fixup_map_xskmap[MAX_FIXUPS];
 112	int fixup_map_stacktrace[MAX_FIXUPS];
 113	int fixup_prog1[MAX_FIXUPS];
 114	int fixup_prog2[MAX_FIXUPS];
 115	int fixup_map_in_map[MAX_FIXUPS];
 116	int fixup_cgroup_storage[MAX_FIXUPS];
 117	int fixup_percpu_cgroup_storage[MAX_FIXUPS];
 118	int fixup_map_spin_lock[MAX_FIXUPS];
 119	int fixup_map_array_ro[MAX_FIXUPS];
 120	int fixup_map_array_wo[MAX_FIXUPS];
 121	int fixup_map_array_small[MAX_FIXUPS];
 122	int fixup_sk_storage_map[MAX_FIXUPS];
 123	int fixup_map_event_output[MAX_FIXUPS];
 124	int fixup_map_reuseport_array[MAX_FIXUPS];
 125	int fixup_map_ringbuf[MAX_FIXUPS];
 126	int fixup_map_timer[MAX_FIXUPS];
 127	int fixup_map_kptr[MAX_FIXUPS];
 128	struct kfunc_btf_id_pair fixup_kfunc_btf_id[MAX_FIXUPS];
 129	/* Expected verifier log output for result REJECT or VERBOSE_ACCEPT.
 130	 * Can be a tab-separated sequence of expected strings. An empty string
 131	 * means no log verification.
 132	 */
 133	const char *errstr;
 134	const char *errstr_unpriv;
 135	uint32_t insn_processed;
 136	int prog_len;
 137	enum {
 138		UNDEF,
 139		ACCEPT,
 140		REJECT,
 141		VERBOSE_ACCEPT,
 142	} result, result_unpriv;
 143	enum bpf_prog_type prog_type;
 144	uint8_t flags;
 145	void (*fill_helper)(struct bpf_test *self);
 146	int runs;
 147#define bpf_testdata_struct_t					\
 148	struct {						\
 149		uint32_t retval, retval_unpriv;			\
 150		union {						\
 151			__u8 data[TEST_DATA_LEN];		\
 152			__u64 data64[TEST_DATA_LEN / 8];	\
 153		};						\
 154	}
 155	union {
 156		bpf_testdata_struct_t;
 157		bpf_testdata_struct_t retvals[MAX_TEST_RUNS];
 158	};
 159	enum bpf_attach_type expected_attach_type;
 160	const char *kfunc;
 161	struct bpf_func_info func_info[MAX_FUNC_INFOS];
 162	int func_info_cnt;
 163	char btf_strings[MAX_BTF_STRINGS];
 164	/* A set of BTF types to load when specified,
 165	 * use macro definitions from test_btf.h,
 166	 * must end with BTF_END_RAW
 167	 */
 168	__u32 btf_types[MAX_BTF_TYPES];
 169};
 170
 171/* Note we want this to be 64 bit aligned so that the end of our array is
 172 * actually the end of the structure.
 173 */
 174#define MAX_ENTRIES 11
 175
 176struct test_val {
 177	unsigned int index;
 178	int foo[MAX_ENTRIES];
 179};
 180
 181struct other_val {
 182	long long foo;
 183	long long bar;
 184};
 185
 186static void bpf_fill_ld_abs_vlan_push_pop(struct bpf_test *self)
 187{
 188	/* test: {skb->data[0], vlan_push} x 51 + {skb->data[0], vlan_pop} x 51 */
 189#define PUSH_CNT 51
 190	/* jump range is limited to 16 bit. PUSH_CNT of ld_abs needs room */
 191	unsigned int len = (1 << 15) - PUSH_CNT * 2 * 5 * 6;
 192	struct bpf_insn *insn = self->fill_insns;
 193	int i = 0, j, k = 0;
 194
 195	insn[i++] = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1);
 196loop:
 197	for (j = 0; j < PUSH_CNT; j++) {
 198		insn[i++] = BPF_LD_ABS(BPF_B, 0);
 199		/* jump to error label */
 200		insn[i] = BPF_JMP32_IMM(BPF_JNE, BPF_REG_0, 0x34, len - i - 3);
 201		i++;
 202		insn[i++] = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6);
 203		insn[i++] = BPF_MOV64_IMM(BPF_REG_2, 1);
 204		insn[i++] = BPF_MOV64_IMM(BPF_REG_3, 2);
 205		insn[i++] = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
 206					 BPF_FUNC_skb_vlan_push);
 207		insn[i] = BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, len - i - 3);
 208		i++;
 209	}
 210
 211	for (j = 0; j < PUSH_CNT; j++) {
 212		insn[i++] = BPF_LD_ABS(BPF_B, 0);
 213		insn[i] = BPF_JMP32_IMM(BPF_JNE, BPF_REG_0, 0x34, len - i - 3);
 214		i++;
 215		insn[i++] = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6);
 216		insn[i++] = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
 217					 BPF_FUNC_skb_vlan_pop);
 218		insn[i] = BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, len - i - 3);
 219		i++;
 220	}
 221	if (++k < 5)
 222		goto loop;
 223
 224	for (; i < len - 3; i++)
 225		insn[i] = BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 0xbef);
 226	insn[len - 3] = BPF_JMP_A(1);
 227	/* error label */
 228	insn[len - 2] = BPF_MOV32_IMM(BPF_REG_0, 0);
 229	insn[len - 1] = BPF_EXIT_INSN();
 230	self->prog_len = len;
 231}
 232
 233static void bpf_fill_jump_around_ld_abs(struct bpf_test *self)
 234{
 235	struct bpf_insn *insn = self->fill_insns;
 236	/* jump range is limited to 16 bit. every ld_abs is replaced by 6 insns,
 237	 * but on arches like arm, ppc etc, there will be one BPF_ZEXT inserted
 238	 * to extend the error value of the inlined ld_abs sequence which then
 239	 * contains 7 insns. so, set the dividend to 7 so the testcase could
 240	 * work on all arches.
 241	 */
 242	unsigned int len = (1 << 15) / 7;
 243	int i = 0;
 244
 245	insn[i++] = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1);
 246	insn[i++] = BPF_LD_ABS(BPF_B, 0);
 247	insn[i] = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 10, len - i - 2);
 248	i++;
 249	while (i < len - 1)
 250		insn[i++] = BPF_LD_ABS(BPF_B, 1);
 251	insn[i] = BPF_EXIT_INSN();
 252	self->prog_len = i + 1;
 253}
 254
 255static void bpf_fill_rand_ld_dw(struct bpf_test *self)
 256{
 257	struct bpf_insn *insn = self->fill_insns;
 258	uint64_t res = 0;
 259	int i = 0;
 260
 261	insn[i++] = BPF_MOV32_IMM(BPF_REG_0, 0);
 262	while (i < self->retval) {
 263		uint64_t val = bpf_semi_rand_get();
 264		struct bpf_insn tmp[2] = { BPF_LD_IMM64(BPF_REG_1, val) };
 265
 266		res ^= val;
 267		insn[i++] = tmp[0];
 268		insn[i++] = tmp[1];
 269		insn[i++] = BPF_ALU64_REG(BPF_XOR, BPF_REG_0, BPF_REG_1);
 270	}
 271	insn[i++] = BPF_MOV64_REG(BPF_REG_1, BPF_REG_0);
 272	insn[i++] = BPF_ALU64_IMM(BPF_RSH, BPF_REG_1, 32);
 273	insn[i++] = BPF_ALU64_REG(BPF_XOR, BPF_REG_0, BPF_REG_1);
 274	insn[i] = BPF_EXIT_INSN();
 275	self->prog_len = i + 1;
 276	res ^= (res >> 32);
 277	self->retval = (uint32_t)res;
 278}
 279
 280#define MAX_JMP_SEQ 8192
 281
 282/* test the sequence of 8k jumps */
 283static void bpf_fill_scale1(struct bpf_test *self)
 284{
 285	struct bpf_insn *insn = self->fill_insns;
 286	int i = 0, k = 0;
 287
 288	insn[i++] = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1);
 289	/* test to check that the long sequence of jumps is acceptable */
 290	while (k++ < MAX_JMP_SEQ) {
 291		insn[i++] = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
 292					 BPF_FUNC_get_prandom_u32);
 293		insn[i++] = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, bpf_semi_rand_get(), 2);
 294		insn[i++] = BPF_MOV64_REG(BPF_REG_1, BPF_REG_10);
 295		insn[i++] = BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_6,
 296					-8 * (k % 64 + 1));
 297	}
 298	/* is_state_visited() doesn't allocate state for pruning for every jump.
 299	 * Hence multiply jmps by 4 to accommodate that heuristic
 300	 */
 301	while (i < MAX_TEST_INSNS - MAX_JMP_SEQ * 4)
 302		insn[i++] = BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 42);
 303	insn[i] = BPF_EXIT_INSN();
 304	self->prog_len = i + 1;
 305	self->retval = 42;
 306}
 307
 308/* test the sequence of 8k jumps in inner most function (function depth 8)*/
 309static void bpf_fill_scale2(struct bpf_test *self)
 310{
 311	struct bpf_insn *insn = self->fill_insns;
 312	int i = 0, k = 0;
 313
 314#define FUNC_NEST 7
 315	for (k = 0; k < FUNC_NEST; k++) {
 316		insn[i++] = BPF_CALL_REL(1);
 317		insn[i++] = BPF_EXIT_INSN();
 318	}
 319	insn[i++] = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1);
 320	/* test to check that the long sequence of jumps is acceptable */
 321	k = 0;
 322	while (k++ < MAX_JMP_SEQ) {
 323		insn[i++] = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
 324					 BPF_FUNC_get_prandom_u32);
 325		insn[i++] = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, bpf_semi_rand_get(), 2);
 326		insn[i++] = BPF_MOV64_REG(BPF_REG_1, BPF_REG_10);
 327		insn[i++] = BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_6,
 328					-8 * (k % (64 - 4 * FUNC_NEST) + 1));
 329	}
 330	while (i < MAX_TEST_INSNS - MAX_JMP_SEQ * 4)
 331		insn[i++] = BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 42);
 332	insn[i] = BPF_EXIT_INSN();
 333	self->prog_len = i + 1;
 334	self->retval = 42;
 335}
 336
 337static void bpf_fill_scale(struct bpf_test *self)
 338{
 339	switch (self->retval) {
 340	case 1:
 341		return bpf_fill_scale1(self);
 342	case 2:
 343		return bpf_fill_scale2(self);
 344	default:
 345		self->prog_len = 0;
 346		break;
 347	}
 348}
 349
 350static int bpf_fill_torturous_jumps_insn_1(struct bpf_insn *insn)
 351{
 352	unsigned int len = 259, hlen = 128;
 353	int i;
 354
 355	insn[0] = BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32);
 356	for (i = 1; i <= hlen; i++) {
 357		insn[i]        = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, i, hlen);
 358		insn[i + hlen] = BPF_JMP_A(hlen - i);
 359	}
 360	insn[len - 2] = BPF_MOV64_IMM(BPF_REG_0, 1);
 361	insn[len - 1] = BPF_EXIT_INSN();
 362
 363	return len;
 364}
 365
 366static int bpf_fill_torturous_jumps_insn_2(struct bpf_insn *insn)
 367{
 368	unsigned int len = 4100, jmp_off = 2048;
 369	int i, j;
 370
 371	insn[0] = BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32);
 372	for (i = 1; i <= jmp_off; i++) {
 373		insn[i] = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, i, jmp_off);
 374	}
 375	insn[i++] = BPF_JMP_A(jmp_off);
 376	for (; i <= jmp_off * 2 + 1; i+=16) {
 377		for (j = 0; j < 16; j++) {
 378			insn[i + j] = BPF_JMP_A(16 - j - 1);
 379		}
 380	}
 381
 382	insn[len - 2] = BPF_MOV64_IMM(BPF_REG_0, 2);
 383	insn[len - 1] = BPF_EXIT_INSN();
 384
 385	return len;
 386}
 387
 388static void bpf_fill_torturous_jumps(struct bpf_test *self)
 389{
 390	struct bpf_insn *insn = self->fill_insns;
 391	int i = 0;
 392
 393	switch (self->retval) {
 394	case 1:
 395		self->prog_len = bpf_fill_torturous_jumps_insn_1(insn);
 396		return;
 397	case 2:
 398		self->prog_len = bpf_fill_torturous_jumps_insn_2(insn);
 399		return;
 400	case 3:
 401		/* main */
 402		insn[i++] = BPF_RAW_INSN(BPF_JMP|BPF_CALL, 0, 1, 0, 4);
 403		insn[i++] = BPF_RAW_INSN(BPF_JMP|BPF_CALL, 0, 1, 0, 262);
 404		insn[i++] = BPF_ST_MEM(BPF_B, BPF_REG_10, -32, 0);
 405		insn[i++] = BPF_MOV64_IMM(BPF_REG_0, 3);
 406		insn[i++] = BPF_EXIT_INSN();
 407
 408		/* subprog 1 */
 409		i += bpf_fill_torturous_jumps_insn_1(insn + i);
 410
 411		/* subprog 2 */
 412		i += bpf_fill_torturous_jumps_insn_2(insn + i);
 413
 414		self->prog_len = i;
 415		return;
 416	default:
 417		self->prog_len = 0;
 418		break;
 419	}
 420}
 421
 422static void bpf_fill_big_prog_with_loop_1(struct bpf_test *self)
 423{
 424	struct bpf_insn *insn = self->fill_insns;
 425	/* This test was added to catch a specific use after free
 426	 * error, which happened upon BPF program reallocation.
 427	 * Reallocation is handled by core.c:bpf_prog_realloc, which
 428	 * reuses old memory if page boundary is not crossed. The
 429	 * value of `len` is chosen to cross this boundary on bpf_loop
 430	 * patching.
 431	 */
 432	const int len = getpagesize() - 25;
 433	int callback_load_idx;
 434	int callback_idx;
 435	int i = 0;
 436
 437	insn[i++] = BPF_ALU64_IMM(BPF_MOV, BPF_REG_1, 1);
 438	callback_load_idx = i;
 439	insn[i++] = BPF_RAW_INSN(BPF_LD | BPF_IMM | BPF_DW,
 440				 BPF_REG_2, BPF_PSEUDO_FUNC, 0,
 441				 777 /* filled below */);
 442	insn[i++] = BPF_RAW_INSN(0, 0, 0, 0, 0);
 443	insn[i++] = BPF_ALU64_IMM(BPF_MOV, BPF_REG_3, 0);
 444	insn[i++] = BPF_ALU64_IMM(BPF_MOV, BPF_REG_4, 0);
 445	insn[i++] = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_loop);
 446
 447	while (i < len - 3)
 448		insn[i++] = BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 0);
 449	insn[i++] = BPF_EXIT_INSN();
 450
 451	callback_idx = i;
 452	insn[i++] = BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 0);
 453	insn[i++] = BPF_EXIT_INSN();
 454
 455	insn[callback_load_idx].imm = callback_idx - callback_load_idx - 1;
 456	self->func_info[1].insn_off = callback_idx;
 457	self->prog_len = i;
 458	assert(i == len);
 459}
 460
 461/* BPF_SK_LOOKUP contains 13 instructions, if you need to fix up maps */
 462#define BPF_SK_LOOKUP(func)						\
 463	/* struct bpf_sock_tuple tuple = {} */				\
 464	BPF_MOV64_IMM(BPF_REG_2, 0),					\
 465	BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_2, -8),			\
 466	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -16),		\
 467	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -24),		\
 468	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -32),		\
 469	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -40),		\
 470	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -48),		\
 471	/* sk = func(ctx, &tuple, sizeof tuple, 0, 0) */		\
 472	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),				\
 473	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -48),				\
 474	BPF_MOV64_IMM(BPF_REG_3, sizeof(struct bpf_sock_tuple)),	\
 475	BPF_MOV64_IMM(BPF_REG_4, 0),					\
 476	BPF_MOV64_IMM(BPF_REG_5, 0),					\
 477	BPF_EMIT_CALL(BPF_FUNC_ ## func)
 478
 479/* BPF_DIRECT_PKT_R2 contains 7 instructions, it initializes default return
 480 * value into 0 and does necessary preparation for direct packet access
 481 * through r2. The allowed access range is 8 bytes.
 482 */
 483#define BPF_DIRECT_PKT_R2						\
 484	BPF_MOV64_IMM(BPF_REG_0, 0),					\
 485	BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,			\
 486		    offsetof(struct __sk_buff, data)),			\
 487	BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,			\
 488		    offsetof(struct __sk_buff, data_end)),		\
 489	BPF_MOV64_REG(BPF_REG_4, BPF_REG_2),				\
 490	BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, 8),				\
 491	BPF_JMP_REG(BPF_JLE, BPF_REG_4, BPF_REG_3, 1),			\
 492	BPF_EXIT_INSN()
 493
 494/* BPF_RAND_UEXT_R7 contains 4 instructions, it initializes R7 into a random
 495 * positive u32, and zero-extend it into 64-bit.
 496 */
 497#define BPF_RAND_UEXT_R7						\
 498	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,			\
 499		     BPF_FUNC_get_prandom_u32),				\
 500	BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),				\
 501	BPF_ALU64_IMM(BPF_LSH, BPF_REG_7, 33),				\
 502	BPF_ALU64_IMM(BPF_RSH, BPF_REG_7, 33)
 503
 504/* BPF_RAND_SEXT_R7 contains 5 instructions, it initializes R7 into a random
 505 * negative u32, and sign-extend it into 64-bit.
 506 */
 507#define BPF_RAND_SEXT_R7						\
 508	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,			\
 509		     BPF_FUNC_get_prandom_u32),				\
 510	BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),				\
 511	BPF_ALU64_IMM(BPF_OR, BPF_REG_7, 0x80000000),			\
 512	BPF_ALU64_IMM(BPF_LSH, BPF_REG_7, 32),				\
 513	BPF_ALU64_IMM(BPF_ARSH, BPF_REG_7, 32)
 514
 515static struct bpf_test tests[] = {
 516#define FILL_ARRAY
 517#include <verifier/tests.h>
 518#undef FILL_ARRAY
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 519};
 520
 521static int probe_filter_length(const struct bpf_insn *fp)
 522{
 523	int len;
 524
 525	for (len = MAX_INSNS - 1; len > 0; --len)
 526		if (fp[len].code != 0 || fp[len].imm != 0)
 527			break;
 528	return len + 1;
 529}
 530
 531static bool skip_unsupported_map(enum bpf_map_type map_type)
 532{
 533	if (!libbpf_probe_bpf_map_type(map_type, NULL)) {
 534		printf("SKIP (unsupported map type %d)\n", map_type);
 535		skips++;
 536		return true;
 537	}
 538	return false;
 539}
 540
 541static int __create_map(uint32_t type, uint32_t size_key,
 542			uint32_t size_value, uint32_t max_elem,
 543			uint32_t extra_flags)
 544{
 545	LIBBPF_OPTS(bpf_map_create_opts, opts);
 546	int fd;
 547
 548	opts.map_flags = (type == BPF_MAP_TYPE_HASH ? BPF_F_NO_PREALLOC : 0) | extra_flags;
 549	fd = bpf_map_create(type, NULL, size_key, size_value, max_elem, &opts);
 550	if (fd < 0) {
 551		if (skip_unsupported_map(type))
 552			return -1;
 553		printf("Failed to create hash map '%s'!\n", strerror(errno));
 554	}
 555
 556	return fd;
 557}
 558
 559static int create_map(uint32_t type, uint32_t size_key,
 560		      uint32_t size_value, uint32_t max_elem)
 561{
 562	return __create_map(type, size_key, size_value, max_elem, 0);
 563}
 564
 565static void update_map(int fd, int index)
 566{
 567	struct test_val value = {
 568		.index = (6 + 1) * sizeof(int),
 569		.foo[6] = 0xabcdef12,
 570	};
 571
 572	assert(!bpf_map_update_elem(fd, &index, &value, 0));
 573}
 574
 575static int create_prog_dummy_simple(enum bpf_prog_type prog_type, int ret)
 576{
 577	struct bpf_insn prog[] = {
 578		BPF_MOV64_IMM(BPF_REG_0, ret),
 579		BPF_EXIT_INSN(),
 580	};
 581
 582	return bpf_prog_load(prog_type, NULL, "GPL", prog, ARRAY_SIZE(prog), NULL);
 583}
 584
 585static int create_prog_dummy_loop(enum bpf_prog_type prog_type, int mfd,
 586				  int idx, int ret)
 587{
 588	struct bpf_insn prog[] = {
 589		BPF_MOV64_IMM(BPF_REG_3, idx),
 590		BPF_LD_MAP_FD(BPF_REG_2, mfd),
 591		BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
 592			     BPF_FUNC_tail_call),
 593		BPF_MOV64_IMM(BPF_REG_0, ret),
 594		BPF_EXIT_INSN(),
 595	};
 596
 597	return bpf_prog_load(prog_type, NULL, "GPL", prog, ARRAY_SIZE(prog), NULL);
 598}
 599
 600static int create_prog_array(enum bpf_prog_type prog_type, uint32_t max_elem,
 601			     int p1key, int p2key, int p3key)
 602{
 603	int mfd, p1fd, p2fd, p3fd;
 604
 605	mfd = bpf_map_create(BPF_MAP_TYPE_PROG_ARRAY, NULL, sizeof(int),
 606			     sizeof(int), max_elem, NULL);
 607	if (mfd < 0) {
 608		if (skip_unsupported_map(BPF_MAP_TYPE_PROG_ARRAY))
 609			return -1;
 610		printf("Failed to create prog array '%s'!\n", strerror(errno));
 611		return -1;
 612	}
 613
 614	p1fd = create_prog_dummy_simple(prog_type, 42);
 615	p2fd = create_prog_dummy_loop(prog_type, mfd, p2key, 41);
 616	p3fd = create_prog_dummy_simple(prog_type, 24);
 617	if (p1fd < 0 || p2fd < 0 || p3fd < 0)
 618		goto err;
 619	if (bpf_map_update_elem(mfd, &p1key, &p1fd, BPF_ANY) < 0)
 620		goto err;
 621	if (bpf_map_update_elem(mfd, &p2key, &p2fd, BPF_ANY) < 0)
 622		goto err;
 623	if (bpf_map_update_elem(mfd, &p3key, &p3fd, BPF_ANY) < 0) {
 624err:
 625		close(mfd);
 626		mfd = -1;
 627	}
 628	close(p3fd);
 629	close(p2fd);
 630	close(p1fd);
 631	return mfd;
 632}
 633
 634static int create_map_in_map(void)
 635{
 636	LIBBPF_OPTS(bpf_map_create_opts, opts);
 637	int inner_map_fd, outer_map_fd;
 638
 639	inner_map_fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, NULL, sizeof(int),
 640				      sizeof(int), 1, NULL);
 641	if (inner_map_fd < 0) {
 642		if (skip_unsupported_map(BPF_MAP_TYPE_ARRAY))
 643			return -1;
 644		printf("Failed to create array '%s'!\n", strerror(errno));
 645		return inner_map_fd;
 646	}
 647
 648	opts.inner_map_fd = inner_map_fd;
 649	outer_map_fd = bpf_map_create(BPF_MAP_TYPE_ARRAY_OF_MAPS, NULL,
 650				      sizeof(int), sizeof(int), 1, &opts);
 651	if (outer_map_fd < 0) {
 652		if (skip_unsupported_map(BPF_MAP_TYPE_ARRAY_OF_MAPS))
 653			return -1;
 654		printf("Failed to create array of maps '%s'!\n",
 655		       strerror(errno));
 656	}
 657
 658	close(inner_map_fd);
 659
 660	return outer_map_fd;
 661}
 662
 663static int create_cgroup_storage(bool percpu)
 664{
 665	enum bpf_map_type type = percpu ? BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE :
 666		BPF_MAP_TYPE_CGROUP_STORAGE;
 667	int fd;
 668
 669	fd = bpf_map_create(type, NULL, sizeof(struct bpf_cgroup_storage_key),
 670			    TEST_DATA_LEN, 0, NULL);
 671	if (fd < 0) {
 672		if (skip_unsupported_map(type))
 673			return -1;
 674		printf("Failed to create cgroup storage '%s'!\n",
 675		       strerror(errno));
 676	}
 677
 678	return fd;
 679}
 680
 681/* struct bpf_spin_lock {
 682 *   int val;
 683 * };
 684 * struct val {
 685 *   int cnt;
 686 *   struct bpf_spin_lock l;
 687 * };
 688 * struct bpf_timer {
 689 *   __u64 :64;
 690 *   __u64 :64;
 691 * } __attribute__((aligned(8)));
 692 * struct timer {
 693 *   struct bpf_timer t;
 694 * };
 695 * struct btf_ptr {
 696 *   struct prog_test_ref_kfunc __kptr_untrusted *ptr;
 697 *   struct prog_test_ref_kfunc __kptr *ptr;
 698 *   struct prog_test_member __kptr *ptr;
 699 * }
 700 */
 701static const char btf_str_sec[] = "\0bpf_spin_lock\0val\0cnt\0l\0bpf_timer\0timer\0t"
 702				  "\0btf_ptr\0prog_test_ref_kfunc\0ptr\0kptr\0kptr_untrusted"
 703				  "\0prog_test_member";
 704static __u32 btf_raw_types[] = {
 705	/* int */
 706	BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4),  /* [1] */
 707	/* struct bpf_spin_lock */                      /* [2] */
 708	BTF_TYPE_ENC(1, BTF_INFO_ENC(BTF_KIND_STRUCT, 0, 1), 4),
 709	BTF_MEMBER_ENC(15, 1, 0), /* int val; */
 710	/* struct val */                                /* [3] */
 711	BTF_TYPE_ENC(15, BTF_INFO_ENC(BTF_KIND_STRUCT, 0, 2), 8),
 712	BTF_MEMBER_ENC(19, 1, 0), /* int cnt; */
 713	BTF_MEMBER_ENC(23, 2, 32),/* struct bpf_spin_lock l; */
 714	/* struct bpf_timer */                          /* [4] */
 715	BTF_TYPE_ENC(25, BTF_INFO_ENC(BTF_KIND_STRUCT, 0, 0), 16),
 716	/* struct timer */                              /* [5] */
 717	BTF_TYPE_ENC(35, BTF_INFO_ENC(BTF_KIND_STRUCT, 0, 1), 16),
 718	BTF_MEMBER_ENC(41, 4, 0), /* struct bpf_timer t; */
 719	/* struct prog_test_ref_kfunc */		/* [6] */
 720	BTF_STRUCT_ENC(51, 0, 0),
 721	BTF_STRUCT_ENC(95, 0, 0),			/* [7] */
 722	/* type tag "kptr_untrusted" */
 723	BTF_TYPE_TAG_ENC(80, 6),			/* [8] */
 724	/* type tag "kptr" */
 725	BTF_TYPE_TAG_ENC(75, 6),			/* [9] */
 726	BTF_TYPE_TAG_ENC(75, 7),			/* [10] */
 727	BTF_PTR_ENC(8),					/* [11] */
 728	BTF_PTR_ENC(9),					/* [12] */
 729	BTF_PTR_ENC(10),				/* [13] */
 730	/* struct btf_ptr */				/* [14] */
 731	BTF_STRUCT_ENC(43, 3, 24),
 732	BTF_MEMBER_ENC(71, 11, 0), /* struct prog_test_ref_kfunc __kptr_untrusted *ptr; */
 733	BTF_MEMBER_ENC(71, 12, 64), /* struct prog_test_ref_kfunc __kptr *ptr; */
 734	BTF_MEMBER_ENC(71, 13, 128), /* struct prog_test_member __kptr *ptr; */
 735};
 736
 737static char bpf_vlog[UINT_MAX >> 8];
 738
 739static int load_btf_spec(__u32 *types, int types_len,
 740			 const char *strings, int strings_len)
 741{
 742	struct btf_header hdr = {
 743		.magic = BTF_MAGIC,
 744		.version = BTF_VERSION,
 745		.hdr_len = sizeof(struct btf_header),
 746		.type_len = types_len,
 747		.str_off = types_len,
 748		.str_len = strings_len,
 749	};
 750	void *ptr, *raw_btf;
 751	int btf_fd;
 752	LIBBPF_OPTS(bpf_btf_load_opts, opts,
 753		    .log_buf = bpf_vlog,
 754		    .log_size = sizeof(bpf_vlog),
 755		    .log_level = (verbose
 756				  ? verif_log_level
 757				  : DEFAULT_LIBBPF_LOG_LEVEL),
 758	);
 759
 760	raw_btf = malloc(sizeof(hdr) + types_len + strings_len);
 761
 762	ptr = raw_btf;
 763	memcpy(ptr, &hdr, sizeof(hdr));
 764	ptr += sizeof(hdr);
 765	memcpy(ptr, types, hdr.type_len);
 766	ptr += hdr.type_len;
 767	memcpy(ptr, strings, hdr.str_len);
 768	ptr += hdr.str_len;
 769
 770	btf_fd = bpf_btf_load(raw_btf, ptr - raw_btf, &opts);
 771	if (btf_fd < 0)
 772		printf("Failed to load BTF spec: '%s'\n", strerror(errno));
 773
 774	free(raw_btf);
 775
 776	return btf_fd < 0 ? -1 : btf_fd;
 777}
 778
 779static int load_btf(void)
 780{
 781	return load_btf_spec(btf_raw_types, sizeof(btf_raw_types),
 782			     btf_str_sec, sizeof(btf_str_sec));
 783}
 784
 785static int load_btf_for_test(struct bpf_test *test)
 786{
 787	int types_num = 0;
 788
 789	while (types_num < MAX_BTF_TYPES &&
 790	       test->btf_types[types_num] != BTF_END_RAW)
 791		++types_num;
 792
 793	int types_len = types_num * sizeof(test->btf_types[0]);
 794
 795	return load_btf_spec(test->btf_types, types_len,
 796			     test->btf_strings, sizeof(test->btf_strings));
 797}
 798
 799static int create_map_spin_lock(void)
 800{
 801	LIBBPF_OPTS(bpf_map_create_opts, opts,
 802		.btf_key_type_id = 1,
 803		.btf_value_type_id = 3,
 804	);
 805	int fd, btf_fd;
 806
 807	btf_fd = load_btf();
 808	if (btf_fd < 0)
 809		return -1;
 810	opts.btf_fd = btf_fd;
 811	fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, "test_map", 4, 8, 1, &opts);
 812	if (fd < 0)
 813		printf("Failed to create map with spin_lock\n");
 814	return fd;
 815}
 816
 817static int create_sk_storage_map(void)
 818{
 819	LIBBPF_OPTS(bpf_map_create_opts, opts,
 820		.map_flags = BPF_F_NO_PREALLOC,
 821		.btf_key_type_id = 1,
 822		.btf_value_type_id = 3,
 823	);
 824	int fd, btf_fd;
 825
 826	btf_fd = load_btf();
 827	if (btf_fd < 0)
 828		return -1;
 829	opts.btf_fd = btf_fd;
 830	fd = bpf_map_create(BPF_MAP_TYPE_SK_STORAGE, "test_map", 4, 8, 0, &opts);
 831	close(opts.btf_fd);
 832	if (fd < 0)
 833		printf("Failed to create sk_storage_map\n");
 834	return fd;
 835}
 836
 837static int create_map_timer(void)
 838{
 839	LIBBPF_OPTS(bpf_map_create_opts, opts,
 840		.btf_key_type_id = 1,
 841		.btf_value_type_id = 5,
 842	);
 843	int fd, btf_fd;
 844
 845	btf_fd = load_btf();
 846	if (btf_fd < 0)
 847		return -1;
 848
 849	opts.btf_fd = btf_fd;
 850	fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, "test_map", 4, 16, 1, &opts);
 851	if (fd < 0)
 852		printf("Failed to create map with timer\n");
 853	return fd;
 854}
 855
 856static int create_map_kptr(void)
 857{
 858	LIBBPF_OPTS(bpf_map_create_opts, opts,
 859		.btf_key_type_id = 1,
 860		.btf_value_type_id = 14,
 861	);
 862	int fd, btf_fd;
 863
 864	btf_fd = load_btf();
 865	if (btf_fd < 0)
 866		return -1;
 867
 868	opts.btf_fd = btf_fd;
 869	fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, "test_map", 4, 24, 1, &opts);
 870	if (fd < 0)
 871		printf("Failed to create map with btf_id pointer\n");
 872	return fd;
 873}
 874
 875static void set_root(bool set)
 876{
 877	__u64 caps;
 878
 879	if (set) {
 880		if (cap_enable_effective(1ULL << CAP_SYS_ADMIN, &caps))
 881			perror("cap_disable_effective(CAP_SYS_ADMIN)");
 882	} else {
 883		if (cap_disable_effective(1ULL << CAP_SYS_ADMIN, &caps))
 884			perror("cap_disable_effective(CAP_SYS_ADMIN)");
 885	}
 886}
 887
 888static __u64 ptr_to_u64(const void *ptr)
 889{
 890	return (uintptr_t) ptr;
 891}
 892
 893static struct btf *btf__load_testmod_btf(struct btf *vmlinux)
 894{
 895	struct bpf_btf_info info;
 896	__u32 len = sizeof(info);
 897	struct btf *btf = NULL;
 898	char name[64];
 899	__u32 id = 0;
 900	int err, fd;
 901
 902	/* Iterate all loaded BTF objects and find bpf_testmod,
 903	 * we need SYS_ADMIN cap for that.
 904	 */
 905	set_root(true);
 906
 907	while (true) {
 908		err = bpf_btf_get_next_id(id, &id);
 909		if (err) {
 910			if (errno == ENOENT)
 911				break;
 912			perror("bpf_btf_get_next_id failed");
 913			break;
 914		}
 915
 916		fd = bpf_btf_get_fd_by_id(id);
 917		if (fd < 0) {
 918			if (errno == ENOENT)
 919				continue;
 920			perror("bpf_btf_get_fd_by_id failed");
 921			break;
 922		}
 923
 924		memset(&info, 0, sizeof(info));
 925		info.name_len = sizeof(name);
 926		info.name = ptr_to_u64(name);
 927		len = sizeof(info);
 928
 929		err = bpf_obj_get_info_by_fd(fd, &info, &len);
 930		if (err) {
 931			close(fd);
 932			perror("bpf_obj_get_info_by_fd failed");
 933			break;
 934		}
 935
 936		if (strcmp("bpf_testmod", name)) {
 937			close(fd);
 938			continue;
 939		}
 940
 941		btf = btf__load_from_kernel_by_id_split(id, vmlinux);
 942		if (!btf) {
 943			close(fd);
 944			break;
 945		}
 946
 947		/* We need the fd to stay open so it can be used in fd_array.
 948		 * The final cleanup call to btf__free will free btf object
 949		 * and close the file descriptor.
 950		 */
 951		btf__set_fd(btf, fd);
 952		break;
 953	}
 954
 955	set_root(false);
 956	return btf;
 957}
 958
 959static struct btf *testmod_btf;
 960static struct btf *vmlinux_btf;
 961
 962static void kfuncs_cleanup(void)
 963{
 964	btf__free(testmod_btf);
 965	btf__free(vmlinux_btf);
 966}
 967
 968static void fixup_prog_kfuncs(struct bpf_insn *prog, int *fd_array,
 969			      struct kfunc_btf_id_pair *fixup_kfunc_btf_id)
 970{
 971	/* Patch in kfunc BTF IDs */
 972	while (fixup_kfunc_btf_id->kfunc) {
 973		int btf_id = 0;
 974
 975		/* try to find kfunc in kernel BTF */
 976		vmlinux_btf = vmlinux_btf ?: btf__load_vmlinux_btf();
 977		if (vmlinux_btf) {
 978			btf_id = btf__find_by_name_kind(vmlinux_btf,
 979							fixup_kfunc_btf_id->kfunc,
 980							BTF_KIND_FUNC);
 981			btf_id = btf_id < 0 ? 0 : btf_id;
 982		}
 983
 984		/* kfunc not found in kernel BTF, try bpf_testmod BTF */
 985		if (!btf_id) {
 986			testmod_btf = testmod_btf ?: btf__load_testmod_btf(vmlinux_btf);
 987			if (testmod_btf) {
 988				btf_id = btf__find_by_name_kind(testmod_btf,
 989								fixup_kfunc_btf_id->kfunc,
 990								BTF_KIND_FUNC);
 991				btf_id = btf_id < 0 ? 0 : btf_id;
 992				if (btf_id) {
 993					/* We put bpf_testmod module fd into fd_array
 994					 * and its index 1 into instruction 'off'.
 995					 */
 996					*fd_array = btf__fd(testmod_btf);
 997					prog[fixup_kfunc_btf_id->insn_idx].off = 1;
 998				}
 999			}
1000		}
1001
1002		prog[fixup_kfunc_btf_id->insn_idx].imm = btf_id;
1003		fixup_kfunc_btf_id++;
1004	}
1005}
1006
1007static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type,
1008			  struct bpf_insn *prog, int *map_fds, int *fd_array)
1009{
1010	int *fixup_map_hash_8b = test->fixup_map_hash_8b;
1011	int *fixup_map_hash_48b = test->fixup_map_hash_48b;
1012	int *fixup_map_hash_16b = test->fixup_map_hash_16b;
1013	int *fixup_map_array_48b = test->fixup_map_array_48b;
1014	int *fixup_map_sockmap = test->fixup_map_sockmap;
1015	int *fixup_map_sockhash = test->fixup_map_sockhash;
1016	int *fixup_map_xskmap = test->fixup_map_xskmap;
1017	int *fixup_map_stacktrace = test->fixup_map_stacktrace;
1018	int *fixup_prog1 = test->fixup_prog1;
1019	int *fixup_prog2 = test->fixup_prog2;
1020	int *fixup_map_in_map = test->fixup_map_in_map;
1021	int *fixup_cgroup_storage = test->fixup_cgroup_storage;
1022	int *fixup_percpu_cgroup_storage = test->fixup_percpu_cgroup_storage;
1023	int *fixup_map_spin_lock = test->fixup_map_spin_lock;
1024	int *fixup_map_array_ro = test->fixup_map_array_ro;
1025	int *fixup_map_array_wo = test->fixup_map_array_wo;
1026	int *fixup_map_array_small = test->fixup_map_array_small;
1027	int *fixup_sk_storage_map = test->fixup_sk_storage_map;
1028	int *fixup_map_event_output = test->fixup_map_event_output;
1029	int *fixup_map_reuseport_array = test->fixup_map_reuseport_array;
1030	int *fixup_map_ringbuf = test->fixup_map_ringbuf;
1031	int *fixup_map_timer = test->fixup_map_timer;
1032	int *fixup_map_kptr = test->fixup_map_kptr;
1033
1034	if (test->fill_helper) {
1035		test->fill_insns = calloc(MAX_TEST_INSNS, sizeof(struct bpf_insn));
1036		test->fill_helper(test);
1037	}
1038
1039	/* Allocating HTs with 1 elem is fine here, since we only test
1040	 * for verifier and not do a runtime lookup, so the only thing
1041	 * that really matters is value size in this case.
1042	 */
1043	if (*fixup_map_hash_8b) {
1044		map_fds[0] = create_map(BPF_MAP_TYPE_HASH, sizeof(long long),
1045					sizeof(long long), 1);
1046		do {
1047			prog[*fixup_map_hash_8b].imm = map_fds[0];
1048			fixup_map_hash_8b++;
1049		} while (*fixup_map_hash_8b);
1050	}
1051
1052	if (*fixup_map_hash_48b) {
1053		map_fds[1] = create_map(BPF_MAP_TYPE_HASH, sizeof(long long),
1054					sizeof(struct test_val), 1);
1055		do {
1056			prog[*fixup_map_hash_48b].imm = map_fds[1];
1057			fixup_map_hash_48b++;
1058		} while (*fixup_map_hash_48b);
1059	}
1060
1061	if (*fixup_map_hash_16b) {
1062		map_fds[2] = create_map(BPF_MAP_TYPE_HASH, sizeof(long long),
1063					sizeof(struct other_val), 1);
1064		do {
1065			prog[*fixup_map_hash_16b].imm = map_fds[2];
1066			fixup_map_hash_16b++;
1067		} while (*fixup_map_hash_16b);
1068	}
1069
1070	if (*fixup_map_array_48b) {
1071		map_fds[3] = create_map(BPF_MAP_TYPE_ARRAY, sizeof(int),
1072					sizeof(struct test_val), 1);
1073		update_map(map_fds[3], 0);
1074		do {
1075			prog[*fixup_map_array_48b].imm = map_fds[3];
1076			fixup_map_array_48b++;
1077		} while (*fixup_map_array_48b);
1078	}
1079
1080	if (*fixup_prog1) {
1081		map_fds[4] = create_prog_array(prog_type, 4, 0, 1, 2);
1082		do {
1083			prog[*fixup_prog1].imm = map_fds[4];
1084			fixup_prog1++;
1085		} while (*fixup_prog1);
1086	}
1087
1088	if (*fixup_prog2) {
1089		map_fds[5] = create_prog_array(prog_type, 8, 7, 1, 2);
1090		do {
1091			prog[*fixup_prog2].imm = map_fds[5];
1092			fixup_prog2++;
1093		} while (*fixup_prog2);
1094	}
1095
1096	if (*fixup_map_in_map) {
1097		map_fds[6] = create_map_in_map();
1098		do {
1099			prog[*fixup_map_in_map].imm = map_fds[6];
1100			fixup_map_in_map++;
1101		} while (*fixup_map_in_map);
1102	}
1103
1104	if (*fixup_cgroup_storage) {
1105		map_fds[7] = create_cgroup_storage(false);
1106		do {
1107			prog[*fixup_cgroup_storage].imm = map_fds[7];
1108			fixup_cgroup_storage++;
1109		} while (*fixup_cgroup_storage);
1110	}
1111
1112	if (*fixup_percpu_cgroup_storage) {
1113		map_fds[8] = create_cgroup_storage(true);
1114		do {
1115			prog[*fixup_percpu_cgroup_storage].imm = map_fds[8];
1116			fixup_percpu_cgroup_storage++;
1117		} while (*fixup_percpu_cgroup_storage);
1118	}
1119	if (*fixup_map_sockmap) {
1120		map_fds[9] = create_map(BPF_MAP_TYPE_SOCKMAP, sizeof(int),
1121					sizeof(int), 1);
1122		do {
1123			prog[*fixup_map_sockmap].imm = map_fds[9];
1124			fixup_map_sockmap++;
1125		} while (*fixup_map_sockmap);
1126	}
1127	if (*fixup_map_sockhash) {
1128		map_fds[10] = create_map(BPF_MAP_TYPE_SOCKHASH, sizeof(int),
1129					sizeof(int), 1);
1130		do {
1131			prog[*fixup_map_sockhash].imm = map_fds[10];
1132			fixup_map_sockhash++;
1133		} while (*fixup_map_sockhash);
1134	}
1135	if (*fixup_map_xskmap) {
1136		map_fds[11] = create_map(BPF_MAP_TYPE_XSKMAP, sizeof(int),
1137					sizeof(int), 1);
1138		do {
1139			prog[*fixup_map_xskmap].imm = map_fds[11];
1140			fixup_map_xskmap++;
1141		} while (*fixup_map_xskmap);
1142	}
1143	if (*fixup_map_stacktrace) {
1144		map_fds[12] = create_map(BPF_MAP_TYPE_STACK_TRACE, sizeof(u32),
1145					 sizeof(u64), 1);
1146		do {
1147			prog[*fixup_map_stacktrace].imm = map_fds[12];
1148			fixup_map_stacktrace++;
1149		} while (*fixup_map_stacktrace);
1150	}
1151	if (*fixup_map_spin_lock) {
1152		map_fds[13] = create_map_spin_lock();
1153		do {
1154			prog[*fixup_map_spin_lock].imm = map_fds[13];
1155			fixup_map_spin_lock++;
1156		} while (*fixup_map_spin_lock);
1157	}
1158	if (*fixup_map_array_ro) {
1159		map_fds[14] = __create_map(BPF_MAP_TYPE_ARRAY, sizeof(int),
1160					   sizeof(struct test_val), 1,
1161					   BPF_F_RDONLY_PROG);
1162		update_map(map_fds[14], 0);
1163		do {
1164			prog[*fixup_map_array_ro].imm = map_fds[14];
1165			fixup_map_array_ro++;
1166		} while (*fixup_map_array_ro);
1167	}
1168	if (*fixup_map_array_wo) {
1169		map_fds[15] = __create_map(BPF_MAP_TYPE_ARRAY, sizeof(int),
1170					   sizeof(struct test_val), 1,
1171					   BPF_F_WRONLY_PROG);
1172		update_map(map_fds[15], 0);
1173		do {
1174			prog[*fixup_map_array_wo].imm = map_fds[15];
1175			fixup_map_array_wo++;
1176		} while (*fixup_map_array_wo);
1177	}
1178	if (*fixup_map_array_small) {
1179		map_fds[16] = __create_map(BPF_MAP_TYPE_ARRAY, sizeof(int),
1180					   1, 1, 0);
1181		update_map(map_fds[16], 0);
1182		do {
1183			prog[*fixup_map_array_small].imm = map_fds[16];
1184			fixup_map_array_small++;
1185		} while (*fixup_map_array_small);
1186	}
1187	if (*fixup_sk_storage_map) {
1188		map_fds[17] = create_sk_storage_map();
1189		do {
1190			prog[*fixup_sk_storage_map].imm = map_fds[17];
1191			fixup_sk_storage_map++;
1192		} while (*fixup_sk_storage_map);
1193	}
1194	if (*fixup_map_event_output) {
1195		map_fds[18] = __create_map(BPF_MAP_TYPE_PERF_EVENT_ARRAY,
1196					   sizeof(int), sizeof(int), 1, 0);
1197		do {
1198			prog[*fixup_map_event_output].imm = map_fds[18];
1199			fixup_map_event_output++;
1200		} while (*fixup_map_event_output);
1201	}
1202	if (*fixup_map_reuseport_array) {
1203		map_fds[19] = __create_map(BPF_MAP_TYPE_REUSEPORT_SOCKARRAY,
1204					   sizeof(u32), sizeof(u64), 1, 0);
1205		do {
1206			prog[*fixup_map_reuseport_array].imm = map_fds[19];
1207			fixup_map_reuseport_array++;
1208		} while (*fixup_map_reuseport_array);
1209	}
1210	if (*fixup_map_ringbuf) {
1211		map_fds[20] = create_map(BPF_MAP_TYPE_RINGBUF, 0,
1212					 0, getpagesize());
1213		do {
1214			prog[*fixup_map_ringbuf].imm = map_fds[20];
1215			fixup_map_ringbuf++;
1216		} while (*fixup_map_ringbuf);
1217	}
1218	if (*fixup_map_timer) {
1219		map_fds[21] = create_map_timer();
1220		do {
1221			prog[*fixup_map_timer].imm = map_fds[21];
1222			fixup_map_timer++;
1223		} while (*fixup_map_timer);
1224	}
1225	if (*fixup_map_kptr) {
1226		map_fds[22] = create_map_kptr();
1227		do {
1228			prog[*fixup_map_kptr].imm = map_fds[22];
1229			fixup_map_kptr++;
1230		} while (*fixup_map_kptr);
1231	}
1232
1233	fixup_prog_kfuncs(prog, fd_array, test->fixup_kfunc_btf_id);
1234}
1235
1236static int set_admin(bool admin)
1237{
1238	int err;
1239
1240	if (admin) {
1241		err = cap_enable_effective(ADMIN_CAPS, NULL);
1242		if (err)
1243			perror("cap_enable_effective(ADMIN_CAPS)");
1244	} else {
1245		err = cap_disable_effective(ADMIN_CAPS, NULL);
1246		if (err)
1247			perror("cap_disable_effective(ADMIN_CAPS)");
1248	}
1249
1250	return err;
1251}
1252
1253static int do_prog_test_run(int fd_prog, bool unpriv, uint32_t expected_val,
1254			    void *data, size_t size_data)
1255{
1256	__u8 tmp[TEST_DATA_LEN << 2];
1257	__u32 size_tmp = sizeof(tmp);
1258	int err, saved_errno;
1259	LIBBPF_OPTS(bpf_test_run_opts, topts,
1260		.data_in = data,
1261		.data_size_in = size_data,
1262		.data_out = tmp,
1263		.data_size_out = size_tmp,
1264		.repeat = 1,
1265	);
1266
1267	if (unpriv)
1268		set_admin(true);
1269	err = bpf_prog_test_run_opts(fd_prog, &topts);
1270	saved_errno = errno;
1271
1272	if (unpriv)
1273		set_admin(false);
1274
1275	if (err) {
1276		switch (saved_errno) {
1277		case ENOTSUPP:
1278			printf("Did not run the program (not supported) ");
1279			return 0;
1280		case EPERM:
1281			if (unpriv) {
1282				printf("Did not run the program (no permission) ");
1283				return 0;
1284			}
1285			/* fallthrough; */
1286		default:
1287			printf("FAIL: Unexpected bpf_prog_test_run error (%s) ",
1288				strerror(saved_errno));
1289			return err;
1290		}
1291	}
1292
1293	if (topts.retval != expected_val && expected_val != POINTER_VALUE) {
1294		printf("FAIL retval %d != %d ", topts.retval, expected_val);
1295		return 1;
1296	}
1297
1298	return 0;
1299}
1300
1301/* Returns true if every part of exp (tab-separated) appears in log, in order.
1302 *
1303 * If exp is an empty string, returns true.
1304 */
1305static bool cmp_str_seq(const char *log, const char *exp)
1306{
1307	char needle[200];
1308	const char *p, *q;
1309	int len;
1310
1311	do {
1312		if (!strlen(exp))
1313			break;
1314		p = strchr(exp, '\t');
1315		if (!p)
1316			p = exp + strlen(exp);
1317
1318		len = p - exp;
1319		if (len >= sizeof(needle) || !len) {
1320			printf("FAIL\nTestcase bug\n");
1321			return false;
1322		}
1323		strncpy(needle, exp, len);
1324		needle[len] = 0;
1325		q = strstr(log, needle);
1326		if (!q) {
1327			printf("FAIL\nUnexpected verifier log!\n"
1328			       "EXP: %s\nRES:\n", needle);
1329			return false;
1330		}
1331		log = q + len;
1332		exp = p + 1;
1333	} while (*p);
1334	return true;
1335}
1336
1337static bool is_null_insn(struct bpf_insn *insn)
1338{
1339	struct bpf_insn null_insn = {};
1340
1341	return memcmp(insn, &null_insn, sizeof(null_insn)) == 0;
1342}
1343
1344static bool is_skip_insn(struct bpf_insn *insn)
1345{
1346	struct bpf_insn skip_insn = SKIP_INSNS();
1347
1348	return memcmp(insn, &skip_insn, sizeof(skip_insn)) == 0;
1349}
1350
1351static int null_terminated_insn_len(struct bpf_insn *seq, int max_len)
1352{
1353	int i;
1354
1355	for (i = 0; i < max_len; ++i) {
1356		if (is_null_insn(&seq[i]))
1357			return i;
1358	}
1359	return max_len;
1360}
1361
1362static bool compare_masked_insn(struct bpf_insn *orig, struct bpf_insn *masked)
1363{
1364	struct bpf_insn orig_masked;
1365
1366	memcpy(&orig_masked, orig, sizeof(orig_masked));
1367	if (masked->imm == INSN_IMM_MASK)
1368		orig_masked.imm = INSN_IMM_MASK;
1369	if (masked->off == INSN_OFF_MASK)
1370		orig_masked.off = INSN_OFF_MASK;
1371
1372	return memcmp(&orig_masked, masked, sizeof(orig_masked)) == 0;
1373}
1374
1375static int find_insn_subseq(struct bpf_insn *seq, struct bpf_insn *subseq,
1376			    int seq_len, int subseq_len)
1377{
1378	int i, j;
1379
1380	if (subseq_len > seq_len)
1381		return -1;
1382
1383	for (i = 0; i < seq_len - subseq_len + 1; ++i) {
1384		bool found = true;
1385
1386		for (j = 0; j < subseq_len; ++j) {
1387			if (!compare_masked_insn(&seq[i + j], &subseq[j])) {
1388				found = false;
1389				break;
1390			}
1391		}
1392		if (found)
1393			return i;
1394	}
1395
1396	return -1;
1397}
1398
1399static int find_skip_insn_marker(struct bpf_insn *seq, int len)
1400{
1401	int i;
1402
1403	for (i = 0; i < len; ++i)
1404		if (is_skip_insn(&seq[i]))
1405			return i;
1406
1407	return -1;
1408}
1409
1410/* Return true if all sub-sequences in `subseqs` could be found in
1411 * `seq` one after another. Sub-sequences are separated by a single
1412 * nil instruction.
1413 */
1414static bool find_all_insn_subseqs(struct bpf_insn *seq, struct bpf_insn *subseqs,
1415				  int seq_len, int max_subseqs_len)
1416{
1417	int subseqs_len = null_terminated_insn_len(subseqs, max_subseqs_len);
1418
1419	while (subseqs_len > 0) {
1420		int skip_idx = find_skip_insn_marker(subseqs, subseqs_len);
1421		int cur_subseq_len = skip_idx < 0 ? subseqs_len : skip_idx;
1422		int subseq_idx = find_insn_subseq(seq, subseqs,
1423						  seq_len, cur_subseq_len);
1424
1425		if (subseq_idx < 0)
1426			return false;
1427		seq += subseq_idx + cur_subseq_len;
1428		seq_len -= subseq_idx + cur_subseq_len;
1429		subseqs += cur_subseq_len + 1;
1430		subseqs_len -= cur_subseq_len + 1;
1431	}
1432
1433	return true;
1434}
1435
1436static void print_insn(struct bpf_insn *buf, int cnt)
1437{
1438	int i;
1439
1440	printf("  addr  op d s off  imm\n");
1441	for (i = 0; i < cnt; ++i) {
1442		struct bpf_insn *insn = &buf[i];
1443
1444		if (is_null_insn(insn))
1445			break;
1446
1447		if (is_skip_insn(insn))
1448			printf("  ...\n");
1449		else
1450			printf("  %04x: %02x %1x %x %04hx %08x\n",
1451			       i, insn->code, insn->dst_reg,
1452			       insn->src_reg, insn->off, insn->imm);
1453	}
1454}
1455
1456static bool check_xlated_program(struct bpf_test *test, int fd_prog)
1457{
1458	struct bpf_insn *buf;
1459	unsigned int cnt;
1460	bool result = true;
1461	bool check_expected = !is_null_insn(test->expected_insns);
1462	bool check_unexpected = !is_null_insn(test->unexpected_insns);
1463
1464	if (!check_expected && !check_unexpected)
1465		goto out;
1466
1467	if (get_xlated_program(fd_prog, &buf, &cnt)) {
1468		printf("FAIL: can't get xlated program\n");
1469		result = false;
1470		goto out;
1471	}
1472
1473	if (check_expected &&
1474	    !find_all_insn_subseqs(buf, test->expected_insns,
1475				   cnt, MAX_EXPECTED_INSNS)) {
1476		printf("FAIL: can't find expected subsequence of instructions\n");
1477		result = false;
1478		if (verbose) {
1479			printf("Program:\n");
1480			print_insn(buf, cnt);
1481			printf("Expected subsequence:\n");
1482			print_insn(test->expected_insns, MAX_EXPECTED_INSNS);
1483		}
1484	}
1485
1486	if (check_unexpected &&
1487	    find_all_insn_subseqs(buf, test->unexpected_insns,
1488				  cnt, MAX_UNEXPECTED_INSNS)) {
1489		printf("FAIL: found unexpected subsequence of instructions\n");
1490		result = false;
1491		if (verbose) {
1492			printf("Program:\n");
1493			print_insn(buf, cnt);
1494			printf("Un-expected subsequence:\n");
1495			print_insn(test->unexpected_insns, MAX_UNEXPECTED_INSNS);
1496		}
1497	}
1498
1499	free(buf);
1500 out:
1501	return result;
1502}
1503
1504static void do_test_single(struct bpf_test *test, bool unpriv,
1505			   int *passes, int *errors)
1506{
1507	int fd_prog, btf_fd, expected_ret, alignment_prevented_execution;
1508	int prog_len, prog_type = test->prog_type;
1509	struct bpf_insn *prog = test->insns;
1510	LIBBPF_OPTS(bpf_prog_load_opts, opts);
1511	int run_errs, run_successes;
1512	int map_fds[MAX_NR_MAPS];
 
1513	const char *expected_err;
1514	int fd_array[2] = { -1, -1 };
1515	int saved_errno;
1516	int fixup_skips;
1517	__u32 pflags;
1518	int i, err;
1519
1520	if ((test->flags & F_NEEDS_JIT_ENABLED) && jit_disabled) {
1521		printf("SKIP (requires BPF JIT)\n");
1522		skips++;
1523		sched_yield();
1524		return;
1525	}
1526
1527	fd_prog = -1;
1528	for (i = 0; i < MAX_NR_MAPS; i++)
1529		map_fds[i] = -1;
1530	btf_fd = -1;
1531
1532	if (!prog_type)
1533		prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
1534	fixup_skips = skips;
1535	do_test_fixup(test, prog_type, prog, map_fds, &fd_array[1]);
1536	if (test->fill_insns) {
1537		prog = test->fill_insns;
1538		prog_len = test->prog_len;
1539	} else {
1540		prog_len = probe_filter_length(prog);
1541	}
1542	/* If there were some map skips during fixup due to missing bpf
1543	 * features, skip this test.
1544	 */
1545	if (fixup_skips != skips)
1546		return;
1547
1548	pflags = testing_prog_flags();
1549	if (test->flags & F_LOAD_WITH_STRICT_ALIGNMENT)
1550		pflags |= BPF_F_STRICT_ALIGNMENT;
1551	if (test->flags & F_NEEDS_EFFICIENT_UNALIGNED_ACCESS)
1552		pflags |= BPF_F_ANY_ALIGNMENT;
1553	if (test->flags & ~3)
1554		pflags |= test->flags;
1555
1556	expected_ret = unpriv && test->result_unpriv != UNDEF ?
1557		       test->result_unpriv : test->result;
1558	expected_err = unpriv && test->errstr_unpriv ?
1559		       test->errstr_unpriv : test->errstr;
1560
1561	opts.expected_attach_type = test->expected_attach_type;
1562	if (verbose)
1563		opts.log_level = verif_log_level | 4; /* force stats */
1564	else if (expected_ret == VERBOSE_ACCEPT)
1565		opts.log_level = 2;
1566	else
1567		opts.log_level = DEFAULT_LIBBPF_LOG_LEVEL;
1568	opts.prog_flags = pflags;
1569	if (fd_array[1] != -1)
1570		opts.fd_array = &fd_array[0];
1571
1572	if ((prog_type == BPF_PROG_TYPE_TRACING ||
1573	     prog_type == BPF_PROG_TYPE_LSM) && test->kfunc) {
1574		int attach_btf_id;
1575
1576		attach_btf_id = libbpf_find_vmlinux_btf_id(test->kfunc,
1577						opts.expected_attach_type);
1578		if (attach_btf_id < 0) {
1579			printf("FAIL\nFailed to find BTF ID for '%s'!\n",
1580				test->kfunc);
1581			(*errors)++;
1582			return;
1583		}
1584
1585		opts.attach_btf_id = attach_btf_id;
1586	}
1587
1588	if (test->btf_types[0] != 0) {
1589		btf_fd = load_btf_for_test(test);
1590		if (btf_fd < 0)
1591			goto fail_log;
1592		opts.prog_btf_fd = btf_fd;
1593	}
1594
1595	if (test->func_info_cnt != 0) {
1596		opts.func_info = test->func_info;
1597		opts.func_info_cnt = test->func_info_cnt;
1598		opts.func_info_rec_size = sizeof(test->func_info[0]);
1599	}
1600
1601	opts.log_buf = bpf_vlog;
1602	opts.log_size = sizeof(bpf_vlog);
1603	fd_prog = bpf_prog_load(prog_type, NULL, "GPL", prog, prog_len, &opts);
1604	saved_errno = errno;
1605
1606	/* BPF_PROG_TYPE_TRACING requires more setup and
1607	 * bpf_probe_prog_type won't give correct answer
1608	 */
1609	if (fd_prog < 0 && prog_type != BPF_PROG_TYPE_TRACING &&
1610	    !libbpf_probe_bpf_prog_type(prog_type, NULL)) {
1611		printf("SKIP (unsupported program type %d)\n", prog_type);
1612		skips++;
1613		goto close_fds;
1614	}
1615
1616	if (fd_prog < 0 && saved_errno == ENOTSUPP) {
1617		printf("SKIP (program uses an unsupported feature)\n");
1618		skips++;
1619		goto close_fds;
1620	}
1621
1622	alignment_prevented_execution = 0;
1623
1624	if (expected_ret == ACCEPT || expected_ret == VERBOSE_ACCEPT) {
1625		if (fd_prog < 0) {
1626			printf("FAIL\nFailed to load prog '%s'!\n",
1627			       strerror(saved_errno));
1628			goto fail_log;
1629		}
1630#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1631		if (fd_prog >= 0 &&
1632		    (test->flags & F_NEEDS_EFFICIENT_UNALIGNED_ACCESS))
1633			alignment_prevented_execution = 1;
1634#endif
1635		if (expected_ret == VERBOSE_ACCEPT && !cmp_str_seq(bpf_vlog, expected_err)) {
1636			goto fail_log;
1637		}
1638	} else {
1639		if (fd_prog >= 0) {
1640			printf("FAIL\nUnexpected success to load!\n");
1641			goto fail_log;
1642		}
1643		if (!expected_err || !cmp_str_seq(bpf_vlog, expected_err)) {
1644			printf("FAIL\nUnexpected error message!\n\tEXP: %s\n\tRES: %s\n",
1645			      expected_err, bpf_vlog);
1646			goto fail_log;
1647		}
1648	}
1649
1650	if (!unpriv && test->insn_processed) {
1651		uint32_t insn_processed;
1652		char *proc;
1653
1654		proc = strstr(bpf_vlog, "processed ");
1655		insn_processed = atoi(proc + 10);
1656		if (test->insn_processed != insn_processed) {
1657			printf("FAIL\nUnexpected insn_processed %u vs %u\n",
1658			       insn_processed, test->insn_processed);
1659			goto fail_log;
1660		}
1661	}
1662
1663	if (verbose)
1664		printf(", verifier log:\n%s", bpf_vlog);
1665
1666	if (!check_xlated_program(test, fd_prog))
1667		goto fail_log;
1668
1669	run_errs = 0;
1670	run_successes = 0;
1671	if (!alignment_prevented_execution && fd_prog >= 0 && test->runs >= 0) {
1672		uint32_t expected_val;
1673		int i;
1674
1675		if (!test->runs)
1676			test->runs = 1;
1677
1678		for (i = 0; i < test->runs; i++) {
1679			if (unpriv && test->retvals[i].retval_unpriv)
1680				expected_val = test->retvals[i].retval_unpriv;
1681			else
1682				expected_val = test->retvals[i].retval;
1683
1684			err = do_prog_test_run(fd_prog, unpriv, expected_val,
1685					       test->retvals[i].data,
1686					       sizeof(test->retvals[i].data));
1687			if (err) {
1688				printf("(run %d/%d) ", i + 1, test->runs);
1689				run_errs++;
1690			} else {
1691				run_successes++;
1692			}
1693		}
1694	}
1695
1696	if (!run_errs) {
1697		(*passes)++;
1698		if (run_successes > 1)
1699			printf("%d cases ", run_successes);
1700		printf("OK");
1701		if (alignment_prevented_execution)
1702			printf(" (NOTE: not executed due to unknown alignment)");
1703		printf("\n");
1704	} else {
1705		printf("\n");
1706		goto fail_log;
1707	}
1708close_fds:
1709	if (test->fill_insns)
1710		free(test->fill_insns);
1711	close(fd_prog);
1712	close(btf_fd);
1713	for (i = 0; i < MAX_NR_MAPS; i++)
1714		close(map_fds[i]);
1715	sched_yield();
1716	return;
1717fail_log:
1718	(*errors)++;
1719	printf("%s", bpf_vlog);
1720	goto close_fds;
1721}
1722
1723static bool is_admin(void)
1724{
1725	__u64 caps;
1726
1727	/* The test checks for finer cap as CAP_NET_ADMIN,
1728	 * CAP_PERFMON, and CAP_BPF instead of CAP_SYS_ADMIN.
1729	 * Thus, disable CAP_SYS_ADMIN at the beginning.
1730	 */
1731	if (cap_disable_effective(1ULL << CAP_SYS_ADMIN, &caps)) {
1732		perror("cap_disable_effective(CAP_SYS_ADMIN)");
1733		return false;
1734	}
1735
1736	return (caps & ADMIN_CAPS) == ADMIN_CAPS;
1737}
1738
1739static bool test_as_unpriv(struct bpf_test *test)
1740{
1741#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1742	/* Some architectures have strict alignment requirements. In
1743	 * that case, the BPF verifier detects if a program has
1744	 * unaligned accesses and rejects them. A user can pass
1745	 * BPF_F_ANY_ALIGNMENT to a program to override this
1746	 * check. That, however, will only work when a privileged user
1747	 * loads a program. An unprivileged user loading a program
1748	 * with this flag will be rejected prior entering the
1749	 * verifier.
1750	 */
1751	if (test->flags & F_NEEDS_EFFICIENT_UNALIGNED_ACCESS)
1752		return false;
1753#endif
1754	return !test->prog_type ||
1755	       test->prog_type == BPF_PROG_TYPE_SOCKET_FILTER ||
1756	       test->prog_type == BPF_PROG_TYPE_CGROUP_SKB;
1757}
1758
1759static int do_test(bool unpriv, unsigned int from, unsigned int to)
1760{
1761	int i, passes = 0, errors = 0;
1762
1763	/* ensure previous instance of the module is unloaded */
1764	unload_bpf_testmod(verbose);
1765
1766	if (load_bpf_testmod(verbose))
1767		return EXIT_FAILURE;
1768
1769	for (i = from; i < to; i++) {
1770		struct bpf_test *test = &tests[i];
1771
1772		/* Program types that are not supported by non-root we
1773		 * skip right away.
1774		 */
1775		if (test_as_unpriv(test) && unpriv_disabled) {
1776			printf("#%d/u %s SKIP\n", i, test->descr);
1777			skips++;
1778		} else if (test_as_unpriv(test)) {
1779			if (!unpriv)
1780				set_admin(false);
1781			printf("#%d/u %s ", i, test->descr);
1782			do_test_single(test, true, &passes, &errors);
1783			if (!unpriv)
1784				set_admin(true);
1785		}
1786
1787		if (unpriv) {
1788			printf("#%d/p %s SKIP\n", i, test->descr);
1789			skips++;
1790		} else {
1791			printf("#%d/p %s ", i, test->descr);
1792			do_test_single(test, false, &passes, &errors);
1793		}
1794	}
1795
1796	unload_bpf_testmod(verbose);
1797	kfuncs_cleanup();
1798
1799	printf("Summary: %d PASSED, %d SKIPPED, %d FAILED\n", passes,
1800	       skips, errors);
1801	return errors ? EXIT_FAILURE : EXIT_SUCCESS;
1802}
1803
1804int main(int argc, char **argv)
1805{
 
 
1806	unsigned int from = 0, to = ARRAY_SIZE(tests);
1807	bool unpriv = !is_admin();
1808	int arg = 1;
1809
1810	if (argc > 1 && strcmp(argv[1], "-v") == 0) {
1811		arg++;
1812		verbose = true;
1813		verif_log_level = 1;
1814		argc--;
1815	}
1816	if (argc > 1 && strcmp(argv[1], "-vv") == 0) {
1817		arg++;
1818		verbose = true;
1819		verif_log_level = 2;
1820		argc--;
1821	}
1822
1823	if (argc == 3) {
1824		unsigned int l = atoi(argv[arg]);
1825		unsigned int u = atoi(argv[arg + 1]);
1826
1827		if (l < to && u < to) {
1828			from = l;
1829			to   = u + 1;
1830		}
1831	} else if (argc == 2) {
1832		unsigned int t = atoi(argv[arg]);
1833
1834		if (t < to) {
1835			from = t;
1836			to   = t + 1;
1837		}
1838	}
1839
1840	unpriv_disabled = get_unpriv_disabled();
1841	if (unpriv && unpriv_disabled) {
1842		printf("Cannot run as unprivileged user with sysctl %s.\n",
1843		       UNPRIV_SYSCTL);
1844		return EXIT_FAILURE;
1845	}
1846
1847	jit_disabled = !is_jit_enabled();
1848
1849	/* Use libbpf 1.0 API mode */
1850	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
1851
1852	bpf_semi_rand_init();
1853	return do_test(unpriv, from, to);
1854}