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

Test verifier/value_adj_spill.c automatically converted to use inline assembly.
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20230325025524.144043-38-eddyz87@gmail.comSigned-off-by: Alexei Starovoitov <ast@kernel.org>

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

@@ -34,6 +34,7 @@
 #include "verifier_spill_fill.skel.h"
 #include "verifier_stack_ptr.skel.h"
 #include "verifier_uninit.skel.h"
+#include "verifier_value_adj_spill.skel.h"
 
 __maybe_unused
 static void run_tests_aux(const char *skel_name, skel_elf_bytes_fn elf_bytes_factory)
@@ -90,3 +91,4 @@ void test_verifier_ringbuf(void)              { RUN(verifier_ringbuf); }
 void test_verifier_spill_fill(void)           { RUN(verifier_spill_fill); }
 void test_verifier_stack_ptr(void)            { RUN(verifier_stack_ptr); }
 void test_verifier_uninit(void)               { RUN(verifier_uninit); }
+void test_verifier_value_adj_spill(void)      { RUN(verifier_value_adj_spill); }

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

+// SPDX-License-Identifier: GPL-2.0
+/* Converted from tools/testing/selftests/bpf/verifier/value_adj_spill.c */
+
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
+
+#define MAX_ENTRIES 11
+
+struct test_val {
+	unsigned int index;
+	int foo[MAX_ENTRIES];
+};
+
+struct {
+	__uint(type, BPF_MAP_TYPE_HASH);
+	__uint(max_entries, 1);
+	__type(key, long long);
+	__type(value, struct test_val);
+} map_hash_48b SEC(".maps");
+
+SEC("socket")
+__description("map element value is preserved across register spilling")
+__success __failure_unpriv __msg_unpriv("R0 leaks addr")
+__retval(0)
+__naked void is_preserved_across_register_spilling(void)
+{
+	asm volatile ("					\
+	r2 = r10;					\
+	r2 += -8;					\
+	r1 = 0;						\
+	*(u64*)(r2 + 0) = r1;				\
+	r1 = %[map_hash_48b] ll;			\
+	call %[bpf_map_lookup_elem];			\
+	if r0 == 0 goto l0_%=;				\
+	r1 = 42;					\
+	*(u64*)(r0 + 0) = r1;				\
+	r1 = r10;					\
+	r1 += -184;					\
+	*(u64*)(r1 + 0) = r0;				\
+	r3 = *(u64*)(r1 + 0);				\
+	r1 = 42;					\
+	*(u64*)(r3 + 0) = r1;				\
+l0_%=:	exit;						\
+"	:
+	: __imm(bpf_map_lookup_elem),
+	  __imm_addr(map_hash_48b)
+	: __clobber_all);
+}
+
+SEC("socket")
+__description("map element value or null is marked on register spilling")
+__success __failure_unpriv __msg_unpriv("R0 leaks addr")
+__retval(0)
+__naked void is_marked_on_register_spilling(void)
+{
+	asm volatile ("					\
+	r2 = r10;					\
+	r2 += -8;					\
+	r1 = 0;						\
+	*(u64*)(r2 + 0) = r1;				\
+	r1 = %[map_hash_48b] ll;			\
+	call %[bpf_map_lookup_elem];			\
+	r1 = r10;					\
+	r1 += -152;					\
+	*(u64*)(r1 + 0) = r0;				\
+	if r0 == 0 goto l0_%=;				\
+	r3 = *(u64*)(r1 + 0);				\
+	r1 = 42;					\
+	*(u64*)(r3 + 0) = r1;				\
+l0_%=:	exit;						\
+"	:
+	: __imm(bpf_map_lookup_elem),
+	  __imm_addr(map_hash_48b)
+	: __clobber_all);
+}
+
+char _license[] SEC("license") = "GPL";

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

-{
-	"map element value is preserved across register spilling",
-	.insns = {
-	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
-	BPF_ST_MEM(BPF_DW, BPF_REG_2, 0, 0),
-	BPF_LD_MAP_FD(BPF_REG_1, 0),
-	BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
-	BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 6),
-	BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 42),
-	BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -184),
-	BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, 0),
-	BPF_LDX_MEM(BPF_DW, BPF_REG_3, BPF_REG_1, 0),
-	BPF_ST_MEM(BPF_DW, BPF_REG_3, 0, 42),
-	BPF_EXIT_INSN(),
-	},
-	.fixup_map_hash_48b = { 3 },
-	.errstr_unpriv = "R0 leaks addr",
-	.result = ACCEPT,
-	.result_unpriv = REJECT,
-},
-{
-	"map element value or null is marked on register spilling",
-	.insns = {
-	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
-	BPF_ST_MEM(BPF_DW, BPF_REG_2, 0, 0),
-	BPF_LD_MAP_FD(BPF_REG_1, 0),
-	BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
-	BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -152),
-	BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, 0),
-	BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2),
-	BPF_LDX_MEM(BPF_DW, BPF_REG_3, BPF_REG_1, 0),
-	BPF_ST_MEM(BPF_DW, BPF_REG_3, 0, 42),
-	BPF_EXIT_INSN(),
-	},
-	.fixup_map_hash_48b = { 3 },
-	.errstr_unpriv = "R0 leaks addr",
-	.result = ACCEPT,
-	.result_unpriv = REJECT,
-},