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

Test verifier/bounds_deduction.c automatically converted to use inline assembly.
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20230325025524.144043-10-eddyz87@gmail.comSigned-off-by: Alexei Starovoitov <ast@kernel.org>

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

@@ -6,6 +6,7 @@
 #include "verifier_and.skel.h"
 #include "verifier_array_access.skel.h"
 #include "verifier_basic_stack.skel.h"
+#include "verifier_bounds_deduction.skel.h"
 
 __maybe_unused
 static void run_tests_aux(const char *skel_name, skel_elf_bytes_fn elf_bytes_factory)
@@ -34,3 +35,4 @@ 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); }
+void test_verifier_bounds_deduction(void)     { RUN(verifier_bounds_deduction); }

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

+// SPDX-License-Identifier: GPL-2.0
+/* Converted from tools/testing/selftests/bpf/verifier/bounds_deduction.c */
+
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
+
+SEC("socket")
+__description("check deducing bounds from const, 1")
+__failure __msg("R0 tried to subtract pointer from scalar")
+__msg_unpriv("R1 has pointer with unsupported alu operation")
+__naked void deducing_bounds_from_const_1(void)
+{
+	asm volatile ("					\
+	r0 = 1;						\
+	if r0 s>= 1 goto l0_%=;				\
+l0_%=:	r0 -= r1;					\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("check deducing bounds from const, 2")
+__success __failure_unpriv
+__msg_unpriv("R1 has pointer with unsupported alu operation")
+__retval(1)
+__naked void deducing_bounds_from_const_2(void)
+{
+	asm volatile ("					\
+	r0 = 1;						\
+	if r0 s>= 1 goto l0_%=;				\
+	exit;						\
+l0_%=:	if r0 s<= 1 goto l1_%=;				\
+	exit;						\
+l1_%=:	r1 -= r0;					\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("check deducing bounds from const, 3")
+__failure __msg("R0 tried to subtract pointer from scalar")
+__msg_unpriv("R1 has pointer with unsupported alu operation")
+__naked void deducing_bounds_from_const_3(void)
+{
+	asm volatile ("					\
+	r0 = 0;						\
+	if r0 s<= 0 goto l0_%=;				\
+l0_%=:	r0 -= r1;					\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("check deducing bounds from const, 4")
+__success __failure_unpriv
+__msg_unpriv("R6 has pointer with unsupported alu operation")
+__retval(0)
+__naked void deducing_bounds_from_const_4(void)
+{
+	asm volatile ("					\
+	r6 = r1;					\
+	r0 = 0;						\
+	if r0 s<= 0 goto l0_%=;				\
+	exit;						\
+l0_%=:	if r0 s>= 0 goto l1_%=;				\
+	exit;						\
+l1_%=:	r6 -= r0;					\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("check deducing bounds from const, 5")
+__failure __msg("R0 tried to subtract pointer from scalar")
+__msg_unpriv("R1 has pointer with unsupported alu operation")
+__naked void deducing_bounds_from_const_5(void)
+{
+	asm volatile ("					\
+	r0 = 0;						\
+	if r0 s>= 1 goto l0_%=;				\
+	r0 -= r1;					\
+l0_%=:	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("check deducing bounds from const, 6")
+__failure __msg("R0 tried to subtract pointer from scalar")
+__msg_unpriv("R1 has pointer with unsupported alu operation")
+__naked void deducing_bounds_from_const_6(void)
+{
+	asm volatile ("					\
+	r0 = 0;						\
+	if r0 s>= 0 goto l0_%=;				\
+	exit;						\
+l0_%=:	r0 -= r1;					\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("check deducing bounds from const, 7")
+__failure __msg("dereference of modified ctx ptr")
+__msg_unpriv("R1 has pointer with unsupported alu operation")
+__flag(BPF_F_ANY_ALIGNMENT)
+__naked void deducing_bounds_from_const_7(void)
+{
+	asm volatile ("					\
+	r0 = %[__imm_0];				\
+	if r0 s>= 0 goto l0_%=;				\
+l0_%=:	r1 -= r0;					\
+	r0 = *(u32*)(r1 + %[__sk_buff_mark]);		\
+	exit;						\
+"	:
+	: __imm_const(__imm_0, ~0),
+	  __imm_const(__sk_buff_mark, offsetof(struct __sk_buff, mark))
+	: __clobber_all);
+}
+
+SEC("socket")
+__description("check deducing bounds from const, 8")
+__failure __msg("negative offset ctx ptr R1 off=-1 disallowed")
+__msg_unpriv("R1 has pointer with unsupported alu operation")
+__flag(BPF_F_ANY_ALIGNMENT)
+__naked void deducing_bounds_from_const_8(void)
+{
+	asm volatile ("					\
+	r0 = %[__imm_0];				\
+	if r0 s>= 0 goto l0_%=;				\
+	r1 += r0;					\
+l0_%=:	r0 = *(u32*)(r1 + %[__sk_buff_mark]);		\
+	exit;						\
+"	:
+	: __imm_const(__imm_0, ~0),
+	  __imm_const(__sk_buff_mark, offsetof(struct __sk_buff, mark))
+	: __clobber_all);
+}
+
+SEC("socket")
+__description("check deducing bounds from const, 9")
+__failure __msg("R0 tried to subtract pointer from scalar")
+__msg_unpriv("R1 has pointer with unsupported alu operation")
+__naked void deducing_bounds_from_const_9(void)
+{
+	asm volatile ("					\
+	r0 = 0;						\
+	if r0 s>= 0 goto l0_%=;				\
+l0_%=:	r0 -= r1;					\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("check deducing bounds from const, 10")
+__failure
+__msg("math between ctx pointer and register with unbounded min value is not allowed")
+__failure_unpriv
+__naked void deducing_bounds_from_const_10(void)
+{
+	asm volatile ("					\
+	r0 = 0;						\
+	if r0 s<= 0 goto l0_%=;				\
+l0_%=:	/* Marks reg as unknown. */			\
+	r0 = -r0;					\
+	r0 -= r1;					\
+	exit;						\
+"	::: __clobber_all);
+}
+
+char _license[] SEC("license") = "GPL";

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

-{
-	"check deducing bounds from const, 1",
-	.insns = {
-		BPF_MOV64_IMM(BPF_REG_0, 1),
-		BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 1, 0),
-		BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
-		BPF_EXIT_INSN(),
-	},
-	.errstr_unpriv = "R1 has pointer with unsupported alu operation",
-	.errstr = "R0 tried to subtract pointer from scalar",
-	.result = REJECT,
-},
-{
-	"check deducing bounds from const, 2",
-	.insns = {
-		BPF_MOV64_IMM(BPF_REG_0, 1),
-		BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 1, 1),
-		BPF_EXIT_INSN(),
-		BPF_JMP_IMM(BPF_JSLE, BPF_REG_0, 1, 1),
-		BPF_EXIT_INSN(),
-		BPF_ALU64_REG(BPF_SUB, BPF_REG_1, BPF_REG_0),
-		BPF_EXIT_INSN(),
-	},
-	.errstr_unpriv = "R1 has pointer with unsupported alu operation",
-	.result_unpriv = REJECT,
-	.result = ACCEPT,
-	.retval = 1,
-},
-{
-	"check deducing bounds from const, 3",
-	.insns = {
-		BPF_MOV64_IMM(BPF_REG_0, 0),
-		BPF_JMP_IMM(BPF_JSLE, BPF_REG_0, 0, 0),
-		BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
-		BPF_EXIT_INSN(),
-	},
-	.errstr_unpriv = "R1 has pointer with unsupported alu operation",
-	.errstr = "R0 tried to subtract pointer from scalar",
-	.result = REJECT,
-},
-{
-	"check deducing bounds from const, 4",
-	.insns = {
-		BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
-		BPF_MOV64_IMM(BPF_REG_0, 0),
-		BPF_JMP_IMM(BPF_JSLE, BPF_REG_0, 0, 1),
-		BPF_EXIT_INSN(),
-		BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 1),
-		BPF_EXIT_INSN(),
-		BPF_ALU64_REG(BPF_SUB, BPF_REG_6, BPF_REG_0),
-		BPF_EXIT_INSN(),
-	},
-	.errstr_unpriv = "R6 has pointer with unsupported alu operation",
-	.result_unpriv = REJECT,
-	.result = ACCEPT,
-},
-{
-	"check deducing bounds from const, 5",
-	.insns = {
-		BPF_MOV64_IMM(BPF_REG_0, 0),
-		BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 1, 1),
-		BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
-		BPF_EXIT_INSN(),
-	},
-	.errstr_unpriv = "R1 has pointer with unsupported alu operation",
-	.errstr = "R0 tried to subtract pointer from scalar",
-	.result = REJECT,
-},
-{
-	"check deducing bounds from const, 6",
-	.insns = {
-		BPF_MOV64_IMM(BPF_REG_0, 0),
-		BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 1),
-		BPF_EXIT_INSN(),
-		BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
-		BPF_EXIT_INSN(),
-	},
-	.errstr_unpriv = "R1 has pointer with unsupported alu operation",
-	.errstr = "R0 tried to subtract pointer from scalar",
-	.result = REJECT,
-},
-{
-	"check deducing bounds from const, 7",
-	.insns = {
-		BPF_MOV64_IMM(BPF_REG_0, ~0),
-		BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 0),
-		BPF_ALU64_REG(BPF_SUB, BPF_REG_1, BPF_REG_0),
-		BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
-			    offsetof(struct __sk_buff, mark)),
-		BPF_EXIT_INSN(),
-	},
-	.errstr_unpriv = "R1 has pointer with unsupported alu operation",
-	.errstr = "dereference of modified ctx ptr",
-	.result = REJECT,
-	.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
-},
-{
-	"check deducing bounds from const, 8",
-	.insns = {
-		BPF_MOV64_IMM(BPF_REG_0, ~0),
-		BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 1),
-		BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_0),
-		BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
-			    offsetof(struct __sk_buff, mark)),
-		BPF_EXIT_INSN(),
-	},
-	.errstr_unpriv = "R1 has pointer with unsupported alu operation",
-	.errstr = "negative offset ctx ptr R1 off=-1 disallowed",
-	.result = REJECT,
-	.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
-},
-{
-	"check deducing bounds from const, 9",
-	.insns = {
-		BPF_MOV64_IMM(BPF_REG_0, 0),
-		BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 0),
-		BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
-		BPF_EXIT_INSN(),
-	},
-	.errstr_unpriv = "R1 has pointer with unsupported alu operation",
-	.errstr = "R0 tried to subtract pointer from scalar",
-	.result = REJECT,
-},
-{
-	"check deducing bounds from const, 10",
-	.insns = {
-		BPF_MOV64_IMM(BPF_REG_0, 0),
-		BPF_JMP_IMM(BPF_JSLE, BPF_REG_0, 0, 0),
-		/* Marks reg as unknown. */
-		BPF_ALU64_IMM(BPF_NEG, BPF_REG_0, 0),
-		BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
-		BPF_EXIT_INSN(),
-	},
-	.errstr = "math between ctx pointer and register with unbounded min value is not allowed",
-	.result = REJECT,
-},