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

Test verifier/uninit.c automatically converted to use inline assembly.
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20230325025524.144043-37-eddyz87@gmail.comSigned-off-by: Alexei Starovoitov <ast@kernel.org>

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

@@ -33,6 +33,7 @@
 #include "verifier_ringbuf.skel.h"
 #include "verifier_spill_fill.skel.h"
 #include "verifier_stack_ptr.skel.h"
+#include "verifier_uninit.skel.h"
 
 __maybe_unused
 static void run_tests_aux(const char *skel_name, skel_elf_bytes_fn elf_bytes_factory)
@@ -88,3 +89,4 @@ void test_verifier_raw_tp_writable(void)      { RUN(verifier_raw_tp_writable); }
 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); }

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

+// SPDX-License-Identifier: GPL-2.0
+/* Converted from tools/testing/selftests/bpf/verifier/uninit.c */
+
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include "../../../include/linux/filter.h"
+#include "bpf_misc.h"
+
+SEC("socket")
+__description("read uninitialized register")
+__failure __msg("R2 !read_ok")
+__failure_unpriv
+__naked void read_uninitialized_register(void)
+{
+	asm volatile ("					\
+	r0 = r2;					\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("read invalid register")
+__failure __msg("R15 is invalid")
+__failure_unpriv
+__naked void read_invalid_register(void)
+{
+	asm volatile ("					\
+	.8byte %[mov64_reg];				\
+	exit;						\
+"	:
+	: __imm_insn(mov64_reg, BPF_MOV64_REG(BPF_REG_0, -1))
+	: __clobber_all);
+}
+
+SEC("socket")
+__description("program doesn't init R0 before exit")
+__failure __msg("R0 !read_ok")
+__failure_unpriv
+__naked void t_init_r0_before_exit(void)
+{
+	asm volatile ("					\
+	r2 = r1;					\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("socket")
+__description("program doesn't init R0 before exit in all branches")
+__failure __msg("R0 !read_ok")
+__msg_unpriv("R1 pointer comparison")
+__naked void before_exit_in_all_branches(void)
+{
+	asm volatile ("					\
+	if r1 >= 0 goto l0_%=;				\
+	r0 = 1;						\
+	r0 += 2;					\
+l0_%=:	exit;						\
+"	::: __clobber_all);
+}
+
+char _license[] SEC("license") = "GPL";

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

-{
-	"read uninitialized register",
-	.insns = {
-	BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
-	BPF_EXIT_INSN(),
-	},
-	.errstr = "R2 !read_ok",
-	.result = REJECT,
-},
-{
-	"read invalid register",
-	.insns = {
-	BPF_MOV64_REG(BPF_REG_0, -1),
-	BPF_EXIT_INSN(),
-	},
-	.errstr = "R15 is invalid",
-	.result = REJECT,
-},
-{
-	"program doesn't init R0 before exit",
-	.insns = {
-	BPF_ALU64_REG(BPF_MOV, BPF_REG_2, BPF_REG_1),
-	BPF_EXIT_INSN(),
-	},
-	.errstr = "R0 !read_ok",
-	.result = REJECT,
-},
-{
-	"program doesn't init R0 before exit in all branches",
-	.insns = {
-	BPF_JMP_IMM(BPF_JGE, BPF_REG_1, 0, 2),
-	BPF_MOV64_IMM(BPF_REG_0, 1),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 2),
-	BPF_EXIT_INSN(),
-	},
-	.errstr = "R0 !read_ok",
-	.errstr_unpriv = "R1 pointer comparison",
-	.result = REJECT,
-},