bpf: rename BPF_F_TEST_SANITY_STRICT to BPF_F_TEST_REG_INVARIANTS

Rename verifier internal flag BPF_F_TEST_SANITY_STRICT to more neutral
BPF_F_TEST_REG_INVARIANTS. This is a follow up to [0].

A few selftests and veristat need to be adjusted in the same patch as
well.

  [0] https://patchwork.kernel.org/project/netdevbpf/patch/20231112010609.848406-5-andrii@kernel.org/

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20231117171404.225508-1-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

include/linux/bpf_verifier.h

@@ -602,7 +602,7 @@ struct bpf_verifier_env {
 	int stack_size;			/* number of states to be processed */
 	bool strict_alignment;		/* perform strict pointer alignment checks */
 	bool test_state_freq;		/* test verifier with different pruning frequency */
-	bool test_sanity_strict;	/* fail verification on sanity violations */
+	bool test_reg_invariants;	/* fail verification on register invariants violations */
 	struct bpf_verifier_state *cur_state; /* current verifier state */
 	struct bpf_verifier_state_list **explored_states; /* search pruning optimization */
 	struct bpf_verifier_state_list *free_list;

include/uapi/linux/bpf.h

@@ -1201,7 +1201,7 @@ enum bpf_perf_event_type {
 #define BPF_F_XDP_DEV_BOUND_ONLY	(1U << 6)
 
 /* The verifier internal test flag. Behavior is undefined */
-#define BPF_F_TEST_SANITY_STRICT	(1U << 7)
+#define BPF_F_TEST_REG_INVARIANTS	(1U << 7)
 
 /* link_create.kprobe_multi.flags used in LINK_CREATE command for
  * BPF_TRACE_KPROBE_MULTI attach type to create return probe.

kernel/bpf/syscall.c

@@ -2574,7 +2574,7 @@ static int bpf_prog_load(union bpf_attr *attr, bpfptr_t uattr, u32 uattr_size)
 				 BPF_F_TEST_RND_HI32 |
 				 BPF_F_XDP_HAS_FRAGS |
 				 BPF_F_XDP_DEV_BOUND_ONLY |
-				 BPF_F_TEST_SANITY_STRICT))
+				 BPF_F_TEST_REG_INVARIANTS))
 		return -EINVAL;
 
 	if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&

kernel/bpf/verifier.c

@@ -2608,14 +2608,14 @@ static int reg_bounds_sanity_check(struct bpf_verifier_env *env,
 
 	return 0;
 out:
-	verbose(env, "REG SANITY VIOLATION (%s): %s u64=[%#llx, %#llx] "
+	verbose(env, "REG INVARIANTS VIOLATION (%s): %s u64=[%#llx, %#llx] "
 		"s64=[%#llx, %#llx] u32=[%#x, %#x] s32=[%#x, %#x] var_off=(%#llx, %#llx)\n",
 		ctx, msg, reg->umin_value, reg->umax_value,
 		reg->smin_value, reg->smax_value,
 		reg->u32_min_value, reg->u32_max_value,
 		reg->s32_min_value, reg->s32_max_value,
 		reg->var_off.value, reg->var_off.mask);
-	if (env->test_sanity_strict)
+	if (env->test_reg_invariants)
 		return -EFAULT;
 	__mark_reg_unbounded(reg);
 	return 0;
@@ -20791,7 +20791,7 @@ int bpf_check(struct bpf_prog **prog, union bpf_attr *attr, bpfptr_t uattr, __u3
 
 	if (is_priv)
 		env->test_state_freq = attr->prog_flags & BPF_F_TEST_STATE_FREQ;
-	env->test_sanity_strict = attr->prog_flags & BPF_F_TEST_SANITY_STRICT;
+	env->test_reg_invariants = attr->prog_flags & BPF_F_TEST_REG_INVARIANTS;
 
 	env->explored_states = kvcalloc(state_htab_size(env),
 				       sizeof(struct bpf_verifier_state_list *),

tools/include/uapi/linux/bpf.h

@@ -1201,7 +1201,7 @@ enum bpf_perf_event_type {
 #define BPF_F_XDP_DEV_BOUND_ONLY	(1U << 6)
 
 /* The verifier internal test flag. Behavior is undefined */
-#define BPF_F_TEST_SANITY_STRICT	(1U << 7)
+#define BPF_F_TEST_REG_INVARIANTS	(1U << 7)
 
 /* link_create.kprobe_multi.flags used in LINK_CREATE command for
  * BPF_TRACE_KPROBE_MULTI attach type to create return probe.

tools/testing/selftests/bpf/prog_tests/bpf_verif_scale.c

@@ -35,7 +35,7 @@ static int check_load(const char *file, enum bpf_prog_type type)
 	}
 
 	bpf_program__set_type(prog, type);
-	bpf_program__set_flags(prog, BPF_F_TEST_RND_HI32 | BPF_F_TEST_SANITY_STRICT);
+	bpf_program__set_flags(prog, BPF_F_TEST_RND_HI32 | BPF_F_TEST_REG_INVARIANTS);
 	bpf_program__set_log_level(prog, 4 | extra_prog_load_log_flags);
 
 	err = bpf_object__load(obj);

tools/testing/selftests/bpf/prog_tests/reg_bounds.c

@@ -838,7 +838,7 @@ static int load_range_cmp_prog(struct range x, struct range y, enum op op,
 		.log_level = 2,
 		.log_buf = log_buf,
 		.log_size = log_sz,
-		.prog_flags = BPF_F_TEST_SANITY_STRICT,
+		.prog_flags = BPF_F_TEST_REG_INVARIANTS,
 	);
 
 	/* ; skip exit block below

tools/testing/selftests/bpf/progs/verifier_bounds.c

@@ -965,7 +965,7 @@ l0_%=:	r0 = 0;						\
 SEC("xdp")
 __description("bound check with JMP_JSLT for crossing 64-bit signed boundary")
 __success __retval(0)
-__flag(!BPF_F_TEST_SANITY_STRICT) /* known sanity violation */
+__flag(!BPF_F_TEST_REG_INVARIANTS) /* known invariants violation */
 __naked void crossing_64_bit_signed_boundary_2(void)
 {
 	asm volatile ("					\
@@ -1047,7 +1047,7 @@ l0_%=:	r0 = 0;						\
 SEC("xdp")
 __description("bound check with JMP32_JSLT for crossing 32-bit signed boundary")
 __success __retval(0)
-__flag(!BPF_F_TEST_SANITY_STRICT) /* known sanity violation */
+__flag(!BPF_F_TEST_REG_INVARIANTS) /* known invariants violation */
 __naked void crossing_32_bit_signed_boundary_2(void)
 {
 	asm volatile ("					\

tools/testing/selftests/bpf/test_loader.c

@@ -179,7 +179,7 @@ static int parse_test_spec(struct test_loader *tester,
 	memset(spec, 0, sizeof(*spec));
 
 	spec->prog_name = bpf_program__name(prog);
-	spec->prog_flags = BPF_F_TEST_SANITY_STRICT; /* by default be strict */
+	spec->prog_flags = BPF_F_TEST_REG_INVARIANTS; /* by default be strict */
 
 	btf = bpf_object__btf(obj);
 	if (!btf) {
@@ -280,8 +280,8 @@ static int parse_test_spec(struct test_loader *tester,
 				update_flags(&spec->prog_flags, BPF_F_SLEEPABLE, clear);
 			} else if (strcmp(val, "BPF_F_XDP_HAS_FRAGS") == 0) {
 				update_flags(&spec->prog_flags, BPF_F_XDP_HAS_FRAGS, clear);
-			} else if (strcmp(val, "BPF_F_TEST_SANITY_STRICT") == 0) {
-				update_flags(&spec->prog_flags, BPF_F_TEST_SANITY_STRICT, clear);
+			} else if (strcmp(val, "BPF_F_TEST_REG_INVARIANTS") == 0) {
+				update_flags(&spec->prog_flags, BPF_F_TEST_REG_INVARIANTS, clear);
 			} else /* assume numeric value */ {
 				err = parse_int(val, &flags, "test prog flags");
 				if (err)

tools/testing/selftests/bpf/test_sock_addr.c

@@ -679,8 +679,7 @@ static int load_path(const struct sock_addr_test *test, const char *path)
 
 	bpf_program__set_type(prog, BPF_PROG_TYPE_CGROUP_SOCK_ADDR);
 	bpf_program__set_expected_attach_type(prog, test->expected_attach_type);
-	bpf_program__set_flags(prog, BPF_F_TEST_RND_HI32);
-	bpf_program__set_flags(prog, BPF_F_TEST_SANITY_STRICT);
+	bpf_program__set_flags(prog, BPF_F_TEST_RND_HI32 | BPF_F_TEST_REG_INVARIANTS);
 
 	err = bpf_object__load(obj);
 	if (err) {

tools/testing/selftests/bpf/test_verifier.c

@@ -1588,7 +1588,7 @@ static void do_test_single(struct bpf_test *test, bool unpriv,
 	if (fixup_skips != skips)
 		return;
 
-	pflags = BPF_F_TEST_RND_HI32 | BPF_F_TEST_SANITY_STRICT;
+	pflags = BPF_F_TEST_RND_HI32 | BPF_F_TEST_REG_INVARIANTS;
 	if (test->flags & F_LOAD_WITH_STRICT_ALIGNMENT)
 		pflags |= BPF_F_STRICT_ALIGNMENT;
 	if (test->flags & F_NEEDS_EFFICIENT_UNALIGNED_ACCESS)

tools/testing/selftests/bpf/testing_helpers.c

@@ -276,7 +276,7 @@ int bpf_prog_test_load(const char *file, enum bpf_prog_type type,
 	if (type != BPF_PROG_TYPE_UNSPEC && bpf_program__type(prog) != type)
 		bpf_program__set_type(prog, type);
 
-	flags = bpf_program__flags(prog) | BPF_F_TEST_RND_HI32 | BPF_F_TEST_SANITY_STRICT;
+	flags = bpf_program__flags(prog) | BPF_F_TEST_RND_HI32 | BPF_F_TEST_REG_INVARIANTS;
 	bpf_program__set_flags(prog, flags);
 
 	err = bpf_object__load(obj);
@@ -299,7 +299,7 @@ int bpf_test_load_program(enum bpf_prog_type type, const struct bpf_insn *insns,
 {
 	LIBBPF_OPTS(bpf_prog_load_opts, opts,
 		.kern_version = kern_version,
-		.prog_flags = BPF_F_TEST_RND_HI32 | BPF_F_TEST_SANITY_STRICT,
+		.prog_flags = BPF_F_TEST_RND_HI32 | BPF_F_TEST_REG_INVARIANTS,
 		.log_level = extra_prog_load_log_flags,
 		.log_buf = log_buf,
 		.log_size = log_buf_sz,

tools/testing/selftests/bpf/veristat.c

@@ -145,7 +145,7 @@ static struct env {
 	bool debug;
 	bool quiet;
 	bool force_checkpoints;
-	bool strict_range_sanity;
+	bool force_reg_invariants;
 	enum resfmt out_fmt;
 	bool show_version;
 	bool comparison_mode;
@@ -225,8 +225,8 @@ static const struct argp_option opts[] = {
 	{ "filter", 'f', "FILTER", 0, "Filter expressions (or @filename for file with expressions)." },
 	{ "test-states", 't', NULL, 0,
 	  "Force frequent BPF verifier state checkpointing (set BPF_F_TEST_STATE_FREQ program flag)" },
-	{ "test-sanity", 'r', NULL, 0,
-	  "Force strict BPF verifier register sanity behavior (BPF_F_TEST_SANITY_STRICT program flag)" },
+	{ "test-reg-invariants", 'r', NULL, 0,
+	  "Force BPF verifier failure on register invariant violation (BPF_F_TEST_REG_INVARIANTS program flag)" },
 	{},
 };
 
@@ -299,7 +299,7 @@ static error_t parse_arg(int key, char *arg, struct argp_state *state)
 		env.force_checkpoints = true;
 		break;
 	case 'r':
-		env.strict_range_sanity = true;
+		env.force_reg_invariants = true;
 		break;
 	case 'n':
 		errno = 0;
@@ -1028,8 +1028,8 @@ static int process_prog(const char *filename, struct bpf_object *obj, struct bpf
 
 	if (env.force_checkpoints)
 		bpf_program__set_flags(prog, bpf_program__flags(prog) | BPF_F_TEST_STATE_FREQ);
-	if (env.strict_range_sanity)
-		bpf_program__set_flags(prog, bpf_program__flags(prog) | BPF_F_TEST_SANITY_STRICT);
+	if (env.force_reg_invariants)
+		bpf_program__set_flags(prog, bpf_program__flags(prog) | BPF_F_TEST_REG_INVARIANTS);
 
 	err = bpf_object__load(obj);
 	env.progs_processed++;