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

Test verifier/basic_stack.c automatically converted to use inline assembly.
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20230325025524.144043-9-eddyz87@gmail.comSigned-off-by: Alexei Starovoitov <ast@kernel.org>

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

@@ -5,6 +5,7 @@
 #include "cap_helpers.h"
 #include "verifier_and.skel.h"
 #include "verifier_array_access.skel.h"
+#include "verifier_basic_stack.skel.h"
 
 __maybe_unused
 static void run_tests_aux(const char *skel_name, skel_elf_bytes_fn elf_bytes_factory)
@@ -32,3 +33,4 @@ static void run_tests_aux(const char *skel_name, skel_elf_bytes_fn elf_bytes_fac
 
 void test_verifier_and(void)                  { RUN(verifier_and); }
 void test_verifier_array_access(void)         { RUN(verifier_array_access); }
+void test_verifier_basic_stack(void)          { RUN(verifier_basic_stack); }

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

+// SPDX-License-Identifier: GPL-2.0
+/* Converted from tools/testing/selftests/bpf/verifier/basic_stack.c */
+
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
+
+struct {
+	__uint(type, BPF_MAP_TYPE_HASH);
+	__uint(max_entries, 1);
+	__type(key, long long);
+	__type(value, long long);
+} map_hash_8b SEC(".maps");
+
+SEC("socket")
+__description("stack out of bounds")
+__failure __msg("invalid write to stack")
+__failure_unpriv
+__naked void stack_out_of_bounds(void)
+{
+	asm volatile ("					\
+	r1 = 0;						\
+	*(u64*)(r10 + 8) = r1;				\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("uninitialized stack1")
+__failure __msg("invalid indirect read from stack")
+__failure_unpriv
+__naked void uninitialized_stack1(void)
+{
+	asm volatile ("					\
+	r2 = r10;					\
+	r2 += -8;					\
+	r1 = %[map_hash_8b] ll;				\
+	call %[bpf_map_lookup_elem];			\
+	exit;						\
+"	:
+	: __imm(bpf_map_lookup_elem),
+	  __imm_addr(map_hash_8b)
+	: __clobber_all);
+}
+
+SEC("socket")
+__description("uninitialized stack2")
+__failure __msg("invalid read from stack")
+__failure_unpriv
+__naked void uninitialized_stack2(void)
+{
+	asm volatile ("					\
+	r2 = r10;					\
+	r0 = *(u64*)(r2 - 8);				\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("invalid fp arithmetic")
+__failure __msg("R1 subtraction from stack pointer")
+__failure_unpriv
+__naked void invalid_fp_arithmetic(void)
+{
+	/* If this gets ever changed, make sure JITs can deal with it. */
+	asm volatile ("					\
+	r0 = 0;						\
+	r1 = r10;					\
+	r1 -= 8;					\
+	*(u64*)(r1 + 0) = r0;				\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("non-invalid fp arithmetic")
+__success __success_unpriv __retval(0)
+__naked void non_invalid_fp_arithmetic(void)
+{
+	asm volatile ("					\
+	r0 = 0;						\
+	*(u64*)(r10 - 8) = r0;				\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("misaligned read from stack")
+__failure __msg("misaligned stack access")
+__failure_unpriv
+__naked void misaligned_read_from_stack(void)
+{
+	asm volatile ("					\
+	r2 = r10;					\
+	r0 = *(u64*)(r2 - 4);				\
+	exit;						\
+"	::: __clobber_all);
+}
+
+char _license[] SEC("license") = "GPL";

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

-{
-	"stack out of bounds",
-	.insns = {
-	BPF_ST_MEM(BPF_DW, BPF_REG_10, 8, 0),
-	BPF_EXIT_INSN(),
-	},
-	.errstr = "invalid write to stack",
-	.result = REJECT,
-},
-{
-	"uninitialized stack1",
-	.insns = {
-	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
-	BPF_LD_MAP_FD(BPF_REG_1, 0),
-	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
-	BPF_EXIT_INSN(),
-	},
-	.fixup_map_hash_8b = { 2 },
-	.errstr = "invalid indirect read from stack",
-	.result = REJECT,
-},
-{
-	"uninitialized stack2",
-	.insns = {
-	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
-	BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_2, -8),
-	BPF_EXIT_INSN(),
-	},
-	.errstr = "invalid read from stack",
-	.result = REJECT,
-},
-{
-	"invalid fp arithmetic",
-	/* If this gets ever changed, make sure JITs can deal with it. */
-	.insns = {
-	BPF_MOV64_IMM(BPF_REG_0, 0),
-	BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
-	BPF_ALU64_IMM(BPF_SUB, BPF_REG_1, 8),
-	BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, 0),
-	BPF_EXIT_INSN(),
-	},
-	.errstr = "R1 subtraction from stack pointer",
-	.result = REJECT,
-},
-{
-	"non-invalid fp arithmetic",
-	.insns = {
-	BPF_MOV64_IMM(BPF_REG_0, 0),
-	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -8),
-	BPF_EXIT_INSN(),
-	},
-	.result = ACCEPT,
-},
-{
-	"misaligned read from stack",
-	.insns = {
-	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
-	BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_2, -4),
-	BPF_EXIT_INSN(),
-	},
-	.errstr = "misaligned stack access",
-	.result = REJECT,
-},