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

Test verifier/direct_stack_access_wraparound.c automatically converted to use inline assembly.
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20230325025524.144043-18-eddyz87@gmail.comSigned-off-by: Alexei Starovoitov <ast@kernel.org>

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

@@ -14,6 +14,7 @@
 #include "verifier_cgroup_storage.skel.h"
 #include "verifier_const_or.skel.h"
 #include "verifier_ctx_sk_msg.skel.h"
+#include "verifier_direct_stack_access_wraparound.skel.h"
 
 __maybe_unused
 static void run_tests_aux(const char *skel_name, skel_elf_bytes_fn elf_bytes_factory)
@@ -50,3 +51,4 @@ void test_verifier_cgroup_skb(void)           { RUN(verifier_cgroup_skb); }
 void test_verifier_cgroup_storage(void)       { RUN(verifier_cgroup_storage); }
 void test_verifier_const_or(void)             { RUN(verifier_const_or); }
 void test_verifier_ctx_sk_msg(void)           { RUN(verifier_ctx_sk_msg); }
+void test_verifier_direct_stack_access_wraparound(void) { RUN(verifier_direct_stack_access_wraparound); }

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

+// SPDX-License-Identifier: GPL-2.0
+/* Converted from tools/testing/selftests/bpf/verifier/direct_stack_access_wraparound.c */
+
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
+
+SEC("socket")
+__description("direct stack access with 32-bit wraparound. test1")
+__failure __msg("fp pointer and 2147483647")
+__failure_unpriv
+__naked void with_32_bit_wraparound_test1(void)
+{
+	asm volatile ("					\
+	r1 = r10;					\
+	r1 += 0x7fffffff;				\
+	r1 += 0x7fffffff;				\
+	w0 = 0;						\
+	*(u8*)(r1 + 0) = r0;				\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("direct stack access with 32-bit wraparound. test2")
+__failure __msg("fp pointer and 1073741823")
+__failure_unpriv
+__naked void with_32_bit_wraparound_test2(void)
+{
+	asm volatile ("					\
+	r1 = r10;					\
+	r1 += 0x3fffffff;				\
+	r1 += 0x3fffffff;				\
+	w0 = 0;						\
+	*(u8*)(r1 + 0) = r0;				\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("direct stack access with 32-bit wraparound. test3")
+__failure __msg("fp pointer offset 1073741822")
+__msg_unpriv("R1 stack pointer arithmetic goes out of range")
+__naked void with_32_bit_wraparound_test3(void)
+{
+	asm volatile ("					\
+	r1 = r10;					\
+	r1 += 0x1fffffff;				\
+	r1 += 0x1fffffff;				\
+	w0 = 0;						\
+	*(u8*)(r1 + 0) = r0;				\
+	exit;						\
+"	::: __clobber_all);
+}
+
+char _license[] SEC("license") = "GPL";

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

-{
-	"direct stack access with 32-bit wraparound. test1",
-	.insns = {
-	BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 0x7fffffff),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 0x7fffffff),
-	BPF_MOV32_IMM(BPF_REG_0, 0),
-	BPF_STX_MEM(BPF_B, BPF_REG_1, BPF_REG_0, 0),
-	BPF_EXIT_INSN(),
-	},
-	.errstr = "fp pointer and 2147483647",
-	.result = REJECT
-},
-{
-	"direct stack access with 32-bit wraparound. test2",
-	.insns = {
-	BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 0x3fffffff),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 0x3fffffff),
-	BPF_MOV32_IMM(BPF_REG_0, 0),
-	BPF_STX_MEM(BPF_B, BPF_REG_1, BPF_REG_0, 0),
-	BPF_EXIT_INSN(),
-	},
-	.errstr = "fp pointer and 1073741823",
-	.result = REJECT
-},
-{
-	"direct stack access with 32-bit wraparound. test3",
-	.insns = {
-	BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 0x1fffffff),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 0x1fffffff),
-	BPF_MOV32_IMM(BPF_REG_0, 0),
-	BPF_STX_MEM(BPF_B, BPF_REG_1, BPF_REG_0, 0),
-	BPF_EXIT_INSN(),
-	},
-	.errstr = "fp pointer offset 1073741822",
-	.errstr_unpriv = "R1 stack pointer arithmetic goes out of range",
-	.result = REJECT
-},