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

Test verifier/map_ptr.c automatically converted to use inline assembly.
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20230325025524.144043-28-eddyz87@gmail.comSigned-off-by: Alexei Starovoitov <ast@kernel.org>

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

@@ -24,6 +24,7 @@
 #include "verifier_int_ptr.skel.h"
 #include "verifier_ld_ind.skel.h"
 #include "verifier_leak_ptr.skel.h"
+#include "verifier_map_ptr.skel.h"
 
 __maybe_unused
 static void run_tests_aux(const char *skel_name, skel_elf_bytes_fn elf_bytes_factory)
@@ -70,3 +71,4 @@ void test_verifier_helper_value_access(void)  { RUN(verifier_helper_value_access
 void test_verifier_int_ptr(void)              { RUN(verifier_int_ptr); }
 void test_verifier_ld_ind(void)               { RUN(verifier_ld_ind); }
 void test_verifier_leak_ptr(void)             { RUN(verifier_leak_ptr); }
+void test_verifier_map_ptr(void)              { RUN(verifier_map_ptr); }

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

+// SPDX-License-Identifier: GPL-2.0
+/* Converted from tools/testing/selftests/bpf/verifier/map_ptr.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_ARRAY);
+	__uint(max_entries, 1);
+	__type(key, int);
+	__type(value, struct test_val);
+} map_array_48b SEC(".maps");
+
+struct other_val {
+	long long foo;
+	long long bar;
+};
+
+struct {
+	__uint(type, BPF_MAP_TYPE_HASH);
+	__uint(max_entries, 1);
+	__type(key, long long);
+	__type(value, struct other_val);
+} map_hash_16b SEC(".maps");
+
+SEC("socket")
+__description("bpf_map_ptr: read with negative offset rejected")
+__failure __msg("R1 is bpf_array invalid negative access: off=-8")
+__failure_unpriv
+__msg_unpriv("access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN")
+__naked void read_with_negative_offset_rejected(void)
+{
+	asm volatile ("					\
+	r1 = r10;					\
+	r1 = %[map_array_48b] ll;			\
+	r6 = *(u64*)(r1 - 8);				\
+	r0 = 1;						\
+	exit;						\
+"	:
+	: __imm_addr(map_array_48b)
+	: __clobber_all);
+}
+
+SEC("socket")
+__description("bpf_map_ptr: write rejected")
+__failure __msg("only read from bpf_array is supported")
+__failure_unpriv
+__msg_unpriv("access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN")
+__naked void bpf_map_ptr_write_rejected(void)
+{
+	asm volatile ("					\
+	r0 = 0;						\
+	*(u64*)(r10 - 8) = r0;				\
+	r2 = r10;					\
+	r2 += -8;					\
+	r1 = %[map_array_48b] ll;			\
+	*(u64*)(r1 + 0) = r2;				\
+	r0 = 1;						\
+	exit;						\
+"	:
+	: __imm_addr(map_array_48b)
+	: __clobber_all);
+}
+
+SEC("socket")
+__description("bpf_map_ptr: read non-existent field rejected")
+__failure
+__msg("cannot access ptr member ops with moff 0 in struct bpf_map with off 1 size 4")
+__failure_unpriv
+__msg_unpriv("access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN")
+__flag(BPF_F_ANY_ALIGNMENT)
+__naked void read_non_existent_field_rejected(void)
+{
+	asm volatile ("					\
+	r6 = 0;						\
+	r1 = %[map_array_48b] ll;			\
+	r6 = *(u32*)(r1 + 1);				\
+	r0 = 1;						\
+	exit;						\
+"	:
+	: __imm_addr(map_array_48b)
+	: __clobber_all);
+}
+
+SEC("socket")
+__description("bpf_map_ptr: read ops field accepted")
+__success __failure_unpriv
+__msg_unpriv("access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN")
+__retval(1)
+__naked void ptr_read_ops_field_accepted(void)
+{
+	asm volatile ("					\
+	r6 = 0;						\
+	r1 = %[map_array_48b] ll;			\
+	r6 = *(u64*)(r1 + 0);				\
+	r0 = 1;						\
+	exit;						\
+"	:
+	: __imm_addr(map_array_48b)
+	: __clobber_all);
+}
+
+SEC("socket")
+__description("bpf_map_ptr: r = 0, map_ptr = map_ptr + r")
+__success __failure_unpriv
+__msg_unpriv("R1 has pointer with unsupported alu operation")
+__retval(0)
+__naked void map_ptr_map_ptr_r(void)
+{
+	asm volatile ("					\
+	r0 = 0;						\
+	*(u64*)(r10 - 8) = r0;				\
+	r2 = r10;					\
+	r2 += -8;					\
+	r0 = 0;						\
+	r1 = %[map_hash_16b] ll;			\
+	r1 += r0;					\
+	call %[bpf_map_lookup_elem];			\
+	r0 = 0;						\
+	exit;						\
+"	:
+	: __imm(bpf_map_lookup_elem),
+	  __imm_addr(map_hash_16b)
+	: __clobber_all);
+}
+
+SEC("socket")
+__description("bpf_map_ptr: r = 0, r = r + map_ptr")
+__success __failure_unpriv
+__msg_unpriv("R0 has pointer with unsupported alu operation")
+__retval(0)
+__naked void _0_r_r_map_ptr(void)
+{
+	asm volatile ("					\
+	r0 = 0;						\
+	*(u64*)(r10 - 8) = r0;				\
+	r2 = r10;					\
+	r2 += -8;					\
+	r1 = 0;						\
+	r0 = %[map_hash_16b] ll;			\
+	r1 += r0;					\
+	call %[bpf_map_lookup_elem];			\
+	r0 = 0;						\
+	exit;						\
+"	:
+	: __imm(bpf_map_lookup_elem),
+	  __imm_addr(map_hash_16b)
+	: __clobber_all);
+}
+
+char _license[] SEC("license") = "GPL";

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

-{
-	"bpf_map_ptr: read with negative offset rejected",
-	.insns = {
-	BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
-	BPF_LD_MAP_FD(BPF_REG_1, 0),
-	BPF_LDX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, -8),
-	BPF_MOV64_IMM(BPF_REG_0, 1),
-	BPF_EXIT_INSN(),
-	},
-	.fixup_map_array_48b = { 1 },
-	.result_unpriv = REJECT,
-	.errstr_unpriv = "access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN",
-	.result = REJECT,
-	.errstr = "R1 is bpf_array invalid negative access: off=-8",
-},
-{
-	"bpf_map_ptr: write rejected",
-	.insns = {
-	BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
-	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_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_2, 0),
-	BPF_MOV64_IMM(BPF_REG_0, 1),
-	BPF_EXIT_INSN(),
-	},
-	.fixup_map_array_48b = { 3 },
-	.result_unpriv = REJECT,
-	.errstr_unpriv = "access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN",
-	.result = REJECT,
-	.errstr = "only read from bpf_array is supported",
-},
-{
-	"bpf_map_ptr: read non-existent field rejected",
-	.insns = {
-	BPF_MOV64_IMM(BPF_REG_6, 0),
-	BPF_LD_MAP_FD(BPF_REG_1, 0),
-	BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_1, 1),
-	BPF_MOV64_IMM(BPF_REG_0, 1),
-	BPF_EXIT_INSN(),
-	},
-	.fixup_map_array_48b = { 1 },
-	.result_unpriv = REJECT,
-	.errstr_unpriv = "access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN",
-	.result = REJECT,
-	.errstr = "cannot access ptr member ops with moff 0 in struct bpf_map with off 1 size 4",
-	.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
-},
-{
-	"bpf_map_ptr: read ops field accepted",
-	.insns = {
-	BPF_MOV64_IMM(BPF_REG_6, 0),
-	BPF_LD_MAP_FD(BPF_REG_1, 0),
-	BPF_LDX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, 0),
-	BPF_MOV64_IMM(BPF_REG_0, 1),
-	BPF_EXIT_INSN(),
-	},
-	.fixup_map_array_48b = { 1 },
-	.result_unpriv = REJECT,
-	.errstr_unpriv = "access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN",
-	.result = ACCEPT,
-	.retval = 1,
-},
-{
-	"bpf_map_ptr: r = 0, map_ptr = map_ptr + r",
-	.insns = {
-	BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
-	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
-	BPF_MOV64_IMM(BPF_REG_0, 0),
-	BPF_LD_MAP_FD(BPF_REG_1, 0),
-	BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_0),
-	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
-	BPF_MOV64_IMM(BPF_REG_0, 0),
-	BPF_EXIT_INSN(),
-	},
-	.fixup_map_hash_16b = { 4 },
-	.result_unpriv = REJECT,
-	.errstr_unpriv = "R1 has pointer with unsupported alu operation",
-	.result = ACCEPT,
-},
-{
-	"bpf_map_ptr: r = 0, r = r + map_ptr",
-	.insns = {
-	BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
-	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
-	BPF_MOV64_IMM(BPF_REG_1, 0),
-	BPF_LD_MAP_FD(BPF_REG_0, 0),
-	BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_0),
-	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
-	BPF_MOV64_IMM(BPF_REG_0, 0),
-	BPF_EXIT_INSN(),
-	},
-	.fixup_map_hash_16b = { 4 },
-	.result_unpriv = REJECT,
-	.errstr_unpriv = "R0 has pointer with unsupported alu operation",
-	.result = ACCEPT,
-},