selftests/bpf: verifier/cfg.c converted to inline assembly

Test verifier/cfg.c automatically converted to use inline assembly.
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20230325025524.144043-12-eddyz87@gmail.comSigned-off-by: Alexei Starovoitov <ast@kernel.org>

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

@@ -8,6 +8,7 @@
 #include "verifier_basic_stack.skel.h"
 #include "verifier_bounds_deduction.skel.h"
 #include "verifier_bounds_mix_sign_unsign.skel.h"
+#include "verifier_cfg.skel.h"
 
 __maybe_unused
 static void run_tests_aux(const char *skel_name, skel_elf_bytes_fn elf_bytes_factory)
@@ -38,3 +39,4 @@ void test_verifier_array_access(void)         { RUN(verifier_array_access); }
 void test_verifier_basic_stack(void)          { RUN(verifier_basic_stack); }
 void test_verifier_bounds_deduction(void)     { RUN(verifier_bounds_deduction); }
 void test_verifier_bounds_mix_sign_unsign(void) { RUN(verifier_bounds_mix_sign_unsign); }
+void test_verifier_cfg(void)                  { RUN(verifier_cfg); }

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

+// SPDX-License-Identifier: GPL-2.0
+/* Converted from tools/testing/selftests/bpf/verifier/cfg.c */
+
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
+
+SEC("socket")
+__description("unreachable")
+__failure __msg("unreachable")
+__failure_unpriv
+__naked void unreachable(void)
+{
+	asm volatile ("					\
+	exit;						\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("unreachable2")
+__failure __msg("unreachable")
+__failure_unpriv
+__naked void unreachable2(void)
+{
+	asm volatile ("					\
+	goto l0_%=;					\
+	goto l0_%=;					\
+l0_%=:	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("out of range jump")
+__failure __msg("jump out of range")
+__failure_unpriv
+__naked void out_of_range_jump(void)
+{
+	asm volatile ("					\
+	goto l0_%=;					\
+	exit;						\
+l0_%=:							\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("out of range jump2")
+__failure __msg("jump out of range")
+__failure_unpriv
+__naked void out_of_range_jump2(void)
+{
+	asm volatile ("					\
+	goto -2;					\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("loop (back-edge)")
+__failure __msg("unreachable insn 1")
+__msg_unpriv("back-edge")
+__naked void loop_back_edge(void)
+{
+	asm volatile ("					\
+l0_%=:	goto l0_%=;					\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("loop2 (back-edge)")
+__failure __msg("unreachable insn 4")
+__msg_unpriv("back-edge")
+__naked void loop2_back_edge(void)
+{
+	asm volatile ("					\
+l0_%=:	r1 = r0;					\
+	r2 = r0;					\
+	r3 = r0;					\
+	goto l0_%=;					\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("conditional loop")
+__failure __msg("infinite loop detected")
+__msg_unpriv("back-edge")
+__naked void conditional_loop(void)
+{
+	asm volatile ("					\
+	r0 = r1;					\
+l0_%=:	r2 = r0;					\
+	r3 = r0;					\
+	if r1 == 0 goto l0_%=;				\
+	exit;						\
+"	::: __clobber_all);
+}
+
+char _license[] SEC("license") = "GPL";

tools/testing/selftests/bpf/verifier/cfg.c

-{
-	"unreachable",
-	.insns = {
-	BPF_EXIT_INSN(),
-	BPF_EXIT_INSN(),
-	},
-	.errstr = "unreachable",
-	.result = REJECT,
-},
-{
-	"unreachable2",
-	.insns = {
-	BPF_JMP_IMM(BPF_JA, 0, 0, 1),
-	BPF_JMP_IMM(BPF_JA, 0, 0, 0),
-	BPF_EXIT_INSN(),
-	},
-	.errstr = "unreachable",
-	.result = REJECT,
-},
-{
-	"out of range jump",
-	.insns = {
-	BPF_JMP_IMM(BPF_JA, 0, 0, 1),
-	BPF_EXIT_INSN(),
-	},
-	.errstr = "jump out of range",
-	.result = REJECT,
-},
-{
-	"out of range jump2",
-	.insns = {
-	BPF_JMP_IMM(BPF_JA, 0, 0, -2),
-	BPF_EXIT_INSN(),
-	},
-	.errstr = "jump out of range",
-	.result = REJECT,
-},
-{
-	"loop (back-edge)",
-	.insns = {
-	BPF_JMP_IMM(BPF_JA, 0, 0, -1),
-	BPF_EXIT_INSN(),
-	},
-	.errstr = "unreachable insn 1",
-	.errstr_unpriv = "back-edge",
-	.result = REJECT,
-},
-{
-	"loop2 (back-edge)",
-	.insns = {
-	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
-	BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
-	BPF_MOV64_REG(BPF_REG_3, BPF_REG_0),
-	BPF_JMP_IMM(BPF_JA, 0, 0, -4),
-	BPF_EXIT_INSN(),
-	},
-	.errstr = "unreachable insn 4",
-	.errstr_unpriv = "back-edge",
-	.result = REJECT,
-},
-{
-	"conditional loop",
-	.insns = {
-	BPF_MOV64_REG(BPF_REG_0, BPF_REG_1),
-	BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
-	BPF_MOV64_REG(BPF_REG_3, BPF_REG_0),
-	BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, -3),
-	BPF_EXIT_INSN(),
-	},
-	.errstr = "infinite loop detected",
-	.errstr_unpriv = "back-edge",
-	.result = REJECT,
-},