selftests/bpf: verifier/loops1 converted to inline assembly

Test verifier/loops1 automatically converted to use inline assembly.

There are a few modifications for the converted tests.
"tracepoint" programs do not support test execution, change program
type to "xdp" (which supports test execution) for the following tests
that have __retval tags:
- bounded loop, count to 4
- bonded loop containing forward jump

Also, remove the __retval tag for test:
- bounded loop, count from positive unknown to 4

As it's return value is a random number.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20230421174234.2391278-10-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

3 files changed, 261 insertions, 206 deletions

diff --git a/tools/testing/selftests/bpf/prog_tests/verifier.c b/tools/testing/selftests/bpf/prog_tests/verifier.c
index 6585432e088f..632546912627 100644
--- a/tools/testing/selftests/bpf/prog_tests/verifier.c
+++ b/tools/testing/selftests/bpf/prog_tests/verifier.c
@@ -32,6 +32,7 @@
 #include "verifier_jeq_infer_not_null.skel.h"
 #include "verifier_ld_ind.skel.h"
 #include "verifier_leak_ptr.skel.h"
+#include "verifier_loops1.skel.h"
 #include "verifier_map_ptr.skel.h"
 #include "verifier_map_ret_val.skel.h"
 #include "verifier_masking.skel.h"
@@ -115,6 +116,7 @@ void test_verifier_int_ptr(void)              { RUN(verifier_int_ptr); }
 void test_verifier_jeq_infer_not_null(void)   { RUN(verifier_jeq_infer_not_null); }
 void test_verifier_ld_ind(void)               { RUN(verifier_ld_ind); }
 void test_verifier_leak_ptr(void)             { RUN(verifier_leak_ptr); }
+void test_verifier_loops1(void)               { RUN(verifier_loops1); }
 void test_verifier_map_ptr(void)              { RUN(verifier_map_ptr); }
 void test_verifier_map_ret_val(void)          { RUN(verifier_map_ret_val); }
 void test_verifier_masking(void)              { RUN(verifier_masking); }
diff --git a/tools/testing/selftests/bpf/progs/verifier_loops1.c b/tools/testing/selftests/bpf/progs/verifier_loops1.c
new file mode 100644
index 000000000000..5bc86af80a9a
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/verifier_loops1.c
@@ -0,0 +1,259 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Converted from tools/testing/selftests/bpf/verifier/loops1.c */
+
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
+
+SEC("xdp")
+__description("bounded loop, count to 4")
+__success __retval(4)
+__naked void bounded_loop_count_to_4(void)
+{
+	asm volatile ("					\
+	r0 = 0;						\
+l0_%=:	r0 += 1;					\
+	if r0 < 4 goto l0_%=;				\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("tracepoint")
+__description("bounded loop, count to 20")
+__success
+__naked void bounded_loop_count_to_20(void)
+{
+	asm volatile ("					\
+	r0 = 0;						\
+l0_%=:	r0 += 3;					\
+	if r0 < 20 goto l0_%=;				\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("tracepoint")
+__description("bounded loop, count from positive unknown to 4")
+__success
+__naked void from_positive_unknown_to_4(void)
+{
+	asm volatile ("					\
+	call %[bpf_get_prandom_u32];			\
+	if r0 s< 0 goto l0_%=;				\
+l1_%=:	r0 += 1;					\
+	if r0 < 4 goto l1_%=;				\
+l0_%=:	exit;						\
+"	:
+	: __imm(bpf_get_prandom_u32)
+	: __clobber_all);
+}
+
+SEC("tracepoint")
+__description("bounded loop, count from totally unknown to 4")
+__success
+__naked void from_totally_unknown_to_4(void)
+{
+	asm volatile ("					\
+	call %[bpf_get_prandom_u32];			\
+l0_%=:	r0 += 1;					\
+	if r0 < 4 goto l0_%=;				\
+	exit;						\
+"	:
+	: __imm(bpf_get_prandom_u32)
+	: __clobber_all);
+}
+
+SEC("tracepoint")
+__description("bounded loop, count to 4 with equality")
+__success
+__naked void count_to_4_with_equality(void)
+{
+	asm volatile ("					\
+	r0 = 0;						\
+l0_%=:	r0 += 1;					\
+	if r0 != 4 goto l0_%=;				\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("tracepoint")
+__description("bounded loop, start in the middle")
+__failure __msg("back-edge")
+__naked void loop_start_in_the_middle(void)
+{
+	asm volatile ("					\
+	r0 = 0;						\
+	goto l0_%=;					\
+l1_%=:	r0 += 1;					\
+l0_%=:	if r0 < 4 goto l1_%=;				\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("xdp")
+__description("bounded loop containing a forward jump")
+__success __retval(4)
+__naked void loop_containing_a_forward_jump(void)
+{
+	asm volatile ("					\
+	r0 = 0;						\
+l1_%=:	r0 += 1;					\
+	if r0 == r0 goto l0_%=;				\
+l0_%=:	if r0 < 4 goto l1_%=;				\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("tracepoint")
+__description("bounded loop that jumps out rather than in")
+__success
+__naked void jumps_out_rather_than_in(void)
+{
+	asm volatile ("					\
+	r6 = 0;						\
+l1_%=:	r6 += 1;					\
+	if r6 > 10000 goto l0_%=;			\
+	call %[bpf_get_prandom_u32];			\
+	goto l1_%=;					\
+l0_%=:	exit;						\
+"	:
+	: __imm(bpf_get_prandom_u32)
+	: __clobber_all);
+}
+
+SEC("tracepoint")
+__description("infinite loop after a conditional jump")
+__failure __msg("program is too large")
+__naked void loop_after_a_conditional_jump(void)
+{
+	asm volatile ("					\
+	r0 = 5;						\
+	if r0 < 4 goto l0_%=;				\
+l1_%=:	r0 += 1;					\
+	goto l1_%=;					\
+l0_%=:	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("tracepoint")
+__description("bounded recursion")
+__failure __msg("back-edge")
+__naked void bounded_recursion(void)
+{
+	asm volatile ("					\
+	r1 = 0;						\
+	call bounded_recursion__1;			\
+	exit;						\
+"	::: __clobber_all);
+}
+
+static __naked __noinline __attribute__((used))
+void bounded_recursion__1(void)
+{
+	asm volatile ("					\
+	r1 += 1;					\
+	r0 = r1;					\
+	if r1 < 4 goto l0_%=;				\
+	exit;						\
+l0_%=:	call bounded_recursion__1;			\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("tracepoint")
+__description("infinite loop in two jumps")
+__failure __msg("loop detected")
+__naked void infinite_loop_in_two_jumps(void)
+{
+	asm volatile ("					\
+	r0 = 0;						\
+l1_%=:	goto l0_%=;					\
+l0_%=:	if r0 < 4 goto l1_%=;				\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("tracepoint")
+__description("infinite loop: three-jump trick")
+__failure __msg("loop detected")
+__naked void infinite_loop_three_jump_trick(void)
+{
+	asm volatile ("					\
+	r0 = 0;						\
+l2_%=:	r0 += 1;					\
+	r0 &= 1;					\
+	if r0 < 2 goto l0_%=;				\
+	exit;						\
+l0_%=:	r0 += 1;					\
+	r0 &= 1;					\
+	if r0 < 2 goto l1_%=;				\
+	exit;						\
+l1_%=:	r0 += 1;					\
+	r0 &= 1;					\
+	if r0 < 2 goto l2_%=;				\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("xdp")
+__description("not-taken loop with back jump to 1st insn")
+__success __retval(123)
+__naked void back_jump_to_1st_insn_1(void)
+{
+	asm volatile ("					\
+l0_%=:	r0 = 123;					\
+	if r0 == 4 goto l0_%=;				\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("xdp")
+__description("taken loop with back jump to 1st insn")
+__success __retval(55)
+__naked void back_jump_to_1st_insn_2(void)
+{
+	asm volatile ("					\
+	r1 = 10;					\
+	r2 = 0;						\
+	call back_jump_to_1st_insn_2__1;		\
+	exit;						\
+"	::: __clobber_all);
+}
+
+static __naked __noinline __attribute__((used))
+void back_jump_to_1st_insn_2__1(void)
+{
+	asm volatile ("					\
+l0_%=:	r2 += r1;					\
+	r1 -= 1;					\
+	if r1 != 0 goto l0_%=;				\
+	r0 = r2;					\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("xdp")
+__description("taken loop with back jump to 1st insn, 2")
+__success __retval(55)
+__naked void jump_to_1st_insn_2(void)
+{
+	asm volatile ("					\
+	r1 = 10;					\
+	r2 = 0;						\
+	call jump_to_1st_insn_2__1;			\
+	exit;						\
+"	::: __clobber_all);
+}
+
+static __naked __noinline __attribute__((used))
+void jump_to_1st_insn_2__1(void)
+{
+	asm volatile ("					\
+l0_%=:	r2 += r1;					\
+	r1 -= 1;					\
+	if w1 != 0 goto l0_%=;				\
+	r0 = r2;					\
+	exit;						\
+"	::: __clobber_all);
+}
+
+char _license[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/bpf/verifier/loops1.c b/tools/testing/selftests/bpf/verifier/loops1.c
deleted file mode 100644
index 1af37187dc12..000000000000
--- a/tools/testing/selftests/bpf/verifier/loops1.c
+++ /dev/null
@@ -1,206 +0,0 @@
-{
-	"bounded loop, count to 4",
-	.insns = {
-	BPF_MOV64_IMM(BPF_REG_0, 0),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
-	BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -2),
-	BPF_EXIT_INSN(),
-	},
-	.result = ACCEPT,
-	.prog_type = BPF_PROG_TYPE_TRACEPOINT,
-	.retval = 4,
-},
-{
-	"bounded loop, count to 20",
-	.insns = {
-	BPF_MOV64_IMM(BPF_REG_0, 0),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 3),
-	BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 20, -2),
-	BPF_EXIT_INSN(),
-	},
-	.result = ACCEPT,
-	.prog_type = BPF_PROG_TYPE_TRACEPOINT,
-},
-{
-	"bounded loop, count from positive unknown to 4",
-	.insns = {
-	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_prandom_u32),
-	BPF_JMP_IMM(BPF_JSLT, BPF_REG_0, 0, 2),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
-	BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -2),
-	BPF_EXIT_INSN(),
-	},
-	.result = ACCEPT,
-	.prog_type = BPF_PROG_TYPE_TRACEPOINT,
-	.retval = 4,
-},
-{
-	"bounded loop, count from totally unknown to 4",
-	.insns = {
-	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_prandom_u32),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
-	BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -2),
-	BPF_EXIT_INSN(),
-	},
-	.result = ACCEPT,
-	.prog_type = BPF_PROG_TYPE_TRACEPOINT,
-},
-{
-	"bounded loop, count to 4 with equality",
-	.insns = {
-		BPF_MOV64_IMM(BPF_REG_0, 0),
-		BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
-		BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 4, -2),
-		BPF_EXIT_INSN(),
-	},
-	.result = ACCEPT,
-	.prog_type = BPF_PROG_TYPE_TRACEPOINT,
-},
-{
-	"bounded loop, start in the middle",
-	.insns = {
-		BPF_MOV64_IMM(BPF_REG_0, 0),
-		BPF_JMP_A(1),
-		BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
-		BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -2),
-		BPF_EXIT_INSN(),
-	},
-	.result = REJECT,
-	.errstr = "back-edge",
-	.prog_type = BPF_PROG_TYPE_TRACEPOINT,
-	.retval = 4,
-},
-{
-	"bounded loop containing a forward jump",
-	.insns = {
-		BPF_MOV64_IMM(BPF_REG_0, 0),
-		BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
-		BPF_JMP_REG(BPF_JEQ, BPF_REG_0, BPF_REG_0, 0),
-		BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -3),
-		BPF_EXIT_INSN(),
-	},
-	.result = ACCEPT,
-	.prog_type = BPF_PROG_TYPE_TRACEPOINT,
-	.retval = 4,
-},
-{
-	"bounded loop that jumps out rather than in",
-	.insns = {
-	BPF_MOV64_IMM(BPF_REG_6, 0),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, 1),
-	BPF_JMP_IMM(BPF_JGT, BPF_REG_6, 10000, 2),
-	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_prandom_u32),
-	BPF_JMP_A(-4),
-	BPF_EXIT_INSN(),
-	},
-	.result = ACCEPT,
-	.prog_type = BPF_PROG_TYPE_TRACEPOINT,
-},
-{
-	"infinite loop after a conditional jump",
-	.insns = {
-	BPF_MOV64_IMM(BPF_REG_0, 5),
-	BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, 2),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
-	BPF_JMP_A(-2),
-	BPF_EXIT_INSN(),
-	},
-	.result = REJECT,
-	.errstr = "program is too large",
-	.prog_type = BPF_PROG_TYPE_TRACEPOINT,
-},
-{
-	"bounded recursion",
-	.insns = {
-	BPF_MOV64_IMM(BPF_REG_1, 0),
-	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
-	BPF_EXIT_INSN(),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 1),
-	BPF_MOV64_REG(BPF_REG_0, BPF_REG_1),
-	BPF_JMP_IMM(BPF_JLT, BPF_REG_1, 4, 1),
-	BPF_EXIT_INSN(),
-	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, -5),
-	BPF_EXIT_INSN(),
-	},
-	.result = REJECT,
-	.errstr = "back-edge",
-	.prog_type = BPF_PROG_TYPE_TRACEPOINT,
-},
-{
-	"infinite loop in two jumps",
-	.insns = {
-	BPF_MOV64_IMM(BPF_REG_0, 0),
-	BPF_JMP_A(0),
-	BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -2),
-	BPF_EXIT_INSN(),
-	},
-	.result = REJECT,
-	.errstr = "loop detected",
-	.prog_type = BPF_PROG_TYPE_TRACEPOINT,
-},
-{
-	"infinite loop: three-jump trick",
-	.insns = {
-	BPF_MOV64_IMM(BPF_REG_0, 0),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
-	BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 1),
-	BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 2, 1),
-	BPF_EXIT_INSN(),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
-	BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 1),
-	BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 2, 1),
-	BPF_EXIT_INSN(),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
-	BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 1),
-	BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 2, -11),
-	BPF_EXIT_INSN(),
-	},
-	.result = REJECT,
-	.errstr = "loop detected",
-	.prog_type = BPF_PROG_TYPE_TRACEPOINT,
-},
-{
-	"not-taken loop with back jump to 1st insn",
-	.insns = {
-	BPF_MOV64_IMM(BPF_REG_0, 123),
-	BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 4, -2),
-	BPF_EXIT_INSN(),
-	},
-	.result = ACCEPT,
-	.prog_type = BPF_PROG_TYPE_XDP,
-	.retval = 123,
-},
-{
-	"taken loop with back jump to 1st insn",
-	.insns = {
-	BPF_MOV64_IMM(BPF_REG_1, 10),
-	BPF_MOV64_IMM(BPF_REG_2, 0),
-	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
-	BPF_EXIT_INSN(),
-	BPF_ALU64_REG(BPF_ADD, BPF_REG_2, BPF_REG_1),
-	BPF_ALU64_IMM(BPF_SUB, BPF_REG_1, 1),
-	BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, -3),
-	BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
-	BPF_EXIT_INSN(),
-	},
-	.result = ACCEPT,
-	.prog_type = BPF_PROG_TYPE_XDP,
-	.retval = 55,
-},
-{
-	"taken loop with back jump to 1st insn, 2",
-	.insns = {
-	BPF_MOV64_IMM(BPF_REG_1, 10),
-	BPF_MOV64_IMM(BPF_REG_2, 0),
-	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
-	BPF_EXIT_INSN(),
-	BPF_ALU64_REG(BPF_ADD, BPF_REG_2, BPF_REG_1),
-	BPF_ALU64_IMM(BPF_SUB, BPF_REG_1, 1),
-	BPF_JMP32_IMM(BPF_JNE, BPF_REG_1, 0, -3),
-	BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
-	BPF_EXIT_INSN(),
-	},
-	.result = ACCEPT,
-	.prog_type = BPF_PROG_TYPE_XDP,
-	.retval = 55,
-},