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Date: Wed, 13 Jul 2022 13:14:23 +0200
From: Toke Høiland-Jørgensen <toke@...hat.com>
To: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <martin.lau@...ux.dev>,
Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...nel.org>,
Stanislav Fomichev <sdf@...gle.com>,
Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
Mykola Lysenko <mykolal@...com>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Jesper Dangaard Brouer <hawk@...nel.org>
Cc: Kumar Kartikeya Dwivedi <memxor@...il.com>, netdev@...r.kernel.org,
bpf@...r.kernel.org,
Freysteinn Alfredsson <freysteinn.alfredsson@....se>,
Cong Wang <xiyou.wangcong@...il.com>,
Toke Høiland-Jørgensen <toke@...hat.com>,
Shuah Khan <shuah@...nel.org>
Subject: [RFC PATCH 15/17] selftests/bpf: Add verifier tests for dequeue prog
From: Kumar Kartikeya Dwivedi <memxor@...il.com>
Test various cases of direct packet access (proper range propagation,
comparison of packet pointers pointing into separate xdp_frames, and
correct invalidation on packet drop (so that multiple packet pointers
are usable safely in a dequeue program)).
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@...il.com>
Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com>
---
tools/testing/selftests/bpf/test_verifier.c | 29 +++-
.../testing/selftests/bpf/verifier/dequeue.c | 160 ++++++++++++++++++
2 files changed, 180 insertions(+), 9 deletions(-)
create mode 100644 tools/testing/selftests/bpf/verifier/dequeue.c
diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index f9d553fbf68a..8d26ca96520b 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -55,7 +55,7 @@
#define MAX_UNEXPECTED_INSNS 32
#define MAX_TEST_INSNS 1000000
#define MAX_FIXUPS 8
-#define MAX_NR_MAPS 23
+#define MAX_NR_MAPS 24
#define MAX_TEST_RUNS 8
#define POINTER_VALUE 0xcafe4all
#define TEST_DATA_LEN 64
@@ -131,6 +131,7 @@ struct bpf_test {
int fixup_map_ringbuf[MAX_FIXUPS];
int fixup_map_timer[MAX_FIXUPS];
int fixup_map_kptr[MAX_FIXUPS];
+ int fixup_map_pifo[MAX_FIXUPS];
struct kfunc_btf_id_pair fixup_kfunc_btf_id[MAX_FIXUPS];
/* Expected verifier log output for result REJECT or VERBOSE_ACCEPT.
* Can be a tab-separated sequence of expected strings. An empty string
@@ -145,6 +146,7 @@ struct bpf_test {
ACCEPT,
REJECT,
VERBOSE_ACCEPT,
+ VERBOSE_REJECT,
} result, result_unpriv;
enum bpf_prog_type prog_type;
uint8_t flags;
@@ -546,11 +548,12 @@ static bool skip_unsupported_map(enum bpf_map_type map_type)
static int __create_map(uint32_t type, uint32_t size_key,
uint32_t size_value, uint32_t max_elem,
- uint32_t extra_flags)
+ uint32_t extra_flags, uint64_t map_extra)
{
LIBBPF_OPTS(bpf_map_create_opts, opts);
int fd;
+ opts.map_extra = map_extra;
opts.map_flags = (type == BPF_MAP_TYPE_HASH ? BPF_F_NO_PREALLOC : 0) | extra_flags;
fd = bpf_map_create(type, NULL, size_key, size_value, max_elem, &opts);
if (fd < 0) {
@@ -565,7 +568,7 @@ static int __create_map(uint32_t type, uint32_t size_key,
static int create_map(uint32_t type, uint32_t size_key,
uint32_t size_value, uint32_t max_elem)
{
- return __create_map(type, size_key, size_value, max_elem, 0);
+ return __create_map(type, size_key, size_value, max_elem, 0, 0);
}
static void update_map(int fd, int index)
@@ -904,6 +907,7 @@ static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type,
int *fixup_map_ringbuf = test->fixup_map_ringbuf;
int *fixup_map_timer = test->fixup_map_timer;
int *fixup_map_kptr = test->fixup_map_kptr;
+ int *fixup_map_pifo = test->fixup_map_pifo;
struct kfunc_btf_id_pair *fixup_kfunc_btf_id = test->fixup_kfunc_btf_id;
if (test->fill_helper) {
@@ -1033,7 +1037,7 @@ static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type,
if (*fixup_map_array_ro) {
map_fds[14] = __create_map(BPF_MAP_TYPE_ARRAY, sizeof(int),
sizeof(struct test_val), 1,
- BPF_F_RDONLY_PROG);
+ BPF_F_RDONLY_PROG, 0);
update_map(map_fds[14], 0);
do {
prog[*fixup_map_array_ro].imm = map_fds[14];
@@ -1043,7 +1047,7 @@ static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type,
if (*fixup_map_array_wo) {
map_fds[15] = __create_map(BPF_MAP_TYPE_ARRAY, sizeof(int),
sizeof(struct test_val), 1,
- BPF_F_WRONLY_PROG);
+ BPF_F_WRONLY_PROG, 0);
update_map(map_fds[15], 0);
do {
prog[*fixup_map_array_wo].imm = map_fds[15];
@@ -1052,7 +1056,7 @@ static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type,
}
if (*fixup_map_array_small) {
map_fds[16] = __create_map(BPF_MAP_TYPE_ARRAY, sizeof(int),
- 1, 1, 0);
+ 1, 1, 0, 0);
update_map(map_fds[16], 0);
do {
prog[*fixup_map_array_small].imm = map_fds[16];
@@ -1068,7 +1072,7 @@ static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type,
}
if (*fixup_map_event_output) {
map_fds[18] = __create_map(BPF_MAP_TYPE_PERF_EVENT_ARRAY,
- sizeof(int), sizeof(int), 1, 0);
+ sizeof(int), sizeof(int), 1, 0, 0);
do {
prog[*fixup_map_event_output].imm = map_fds[18];
fixup_map_event_output++;
@@ -1076,7 +1080,7 @@ static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type,
}
if (*fixup_map_reuseport_array) {
map_fds[19] = __create_map(BPF_MAP_TYPE_REUSEPORT_SOCKARRAY,
- sizeof(u32), sizeof(u64), 1, 0);
+ sizeof(u32), sizeof(u64), 1, 0, 0);
do {
prog[*fixup_map_reuseport_array].imm = map_fds[19];
fixup_map_reuseport_array++;
@@ -1104,6 +1108,13 @@ static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type,
fixup_map_kptr++;
} while (*fixup_map_kptr);
}
+ if (*fixup_map_pifo) {
+ map_fds[23] = __create_map(BPF_MAP_TYPE_PIFO_XDP, sizeof(u32), sizeof(u32), 1, 0, 8);
+ do {
+ prog[*fixup_map_pifo].imm = map_fds[23];
+ fixup_map_pifo++;
+ } while (*fixup_map_pifo);
+ }
/* Patch in kfunc BTF IDs */
if (fixup_kfunc_btf_id->kfunc) {
@@ -1490,7 +1501,7 @@ static void do_test_single(struct bpf_test *test, bool unpriv,
test->errstr_unpriv : test->errstr;
opts.expected_attach_type = test->expected_attach_type;
- if (verbose)
+ if (verbose || expected_ret == VERBOSE_REJECT)
opts.log_level = VERBOSE_LIBBPF_LOG_LEVEL;
else if (expected_ret == VERBOSE_ACCEPT)
opts.log_level = 2;
diff --git a/tools/testing/selftests/bpf/verifier/dequeue.c b/tools/testing/selftests/bpf/verifier/dequeue.c
new file mode 100644
index 000000000000..730f14395bcc
--- /dev/null
+++ b/tools/testing/selftests/bpf/verifier/dequeue.c
@@ -0,0 +1,160 @@
+{
+ "dequeue: non-xdp_md retval",
+ .insns = {
+ BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+ BPF_LD_MAP_FD(BPF_REG_2, 0),
+ BPF_MOV64_IMM(BPF_REG_3, 0),
+ BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8),
+ BPF_ST_MEM(BPF_DW, BPF_REG_4, 0, 0),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_packet_dequeue),
+ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_0, offsetof(struct xdp_md, data)),
+ BPF_EXIT_INSN(),
+ },
+ .prog_type = BPF_PROG_TYPE_DEQUEUE,
+ .result = REJECT,
+ .errstr = "At program exit the register R0 must be NULL or referenced ptr_xdp_md",
+ .fixup_map_pifo = { 1 },
+},
+{
+ "dequeue: NULL retval",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .runs = -1,
+ .prog_type = BPF_PROG_TYPE_DEQUEUE,
+ .result = ACCEPT,
+},
+{
+ "dequeue: cannot access except data, data_end, data_meta",
+ .insns = {
+ BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+ BPF_LD_MAP_FD(BPF_REG_2, 0),
+ BPF_MOV64_IMM(BPF_REG_3, 0),
+ BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8),
+ BPF_ST_MEM(BPF_DW, BPF_REG_4, 0, 0),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_packet_dequeue),
+ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_0, offsetof(struct xdp_md, data)),
+ BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_0, offsetof(struct xdp_md, data_end)),
+ BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_0, offsetof(struct xdp_md, data_meta)),
+ BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_0, offsetof(struct xdp_md, ingress_ifindex)),
+ BPF_EXIT_INSN(),
+ },
+ .prog_type = BPF_PROG_TYPE_DEQUEUE,
+ .result = REJECT,
+ .errstr = "no read support for xdp_md at off 12",
+ .fixup_map_pifo = { 1 },
+},
+{
+ "dequeue: pkt_uid preserved when resetting range on rX += var",
+ .insns = {
+ BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+ BPF_LD_MAP_FD(BPF_REG_2, 0),
+ BPF_MOV64_IMM(BPF_REG_3, 0),
+ BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8),
+ BPF_ST_MEM(BPF_DW, BPF_REG_4, 0, 0),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_packet_dequeue),
+ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_6, offsetof(struct dequeue_ctx, egress_ifindex)),
+ BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_0, offsetof(struct xdp_md, data)),
+ BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
+ BPF_EXIT_INSN(),
+ },
+ .prog_type = BPF_PROG_TYPE_DEQUEUE,
+ .result = VERBOSE_REJECT,
+ .errstr = "13: (0f) r0 += r1 ; R0_w=pkt(id=3,off=0,r=0,pkt_uid=2",
+ .fixup_map_pifo = { 1 },
+},
+{
+ "dequeue: dpa bad comparison",
+ .insns = {
+ BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+ BPF_LD_MAP_FD(BPF_REG_2, 0),
+ BPF_MOV64_IMM(BPF_REG_3, 0),
+ BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8),
+ BPF_ST_MEM(BPF_DW, BPF_REG_4, 0, 0),
+ BPF_MOV64_REG(BPF_REG_8, BPF_REG_4),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_packet_dequeue),
+ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
+ BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+ BPF_LD_MAP_FD(BPF_REG_2, 0),
+ BPF_MOV64_IMM(BPF_REG_3, 0),
+ BPF_MOV64_REG(BPF_REG_4, BPF_REG_8),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_packet_dequeue),
+ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
+ BPF_MOV64_REG(BPF_REG_0, BPF_REG_7),
+ BPF_EXIT_INSN(),
+ BPF_MOV64_REG(BPF_REG_8, BPF_REG_0),
+ BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_8, offsetof(struct xdp_md, data)),
+ BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_7, offsetof(struct xdp_md, data_end)),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 8),
+ BPF_JMP_REG(BPF_JGE, BPF_REG_0, BPF_REG_1, 1),
+ BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_0, 0),
+ BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+ BPF_MOV64_REG(BPF_REG_2, BPF_REG_7),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_packet_drop),
+ BPF_MOV64_REG(BPF_REG_0, BPF_REG_8),
+ BPF_EXIT_INSN(),
+ },
+ .prog_type = BPF_PROG_TYPE_DEQUEUE,
+ .result = REJECT,
+ .errstr = "R0, R1 pkt pointer comparison prohibited",
+ .fixup_map_pifo = { 1, 14 },
+},
+{
+ "dequeue: dpa scoped range propagation",
+ .insns = {
+ BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+ BPF_LD_MAP_FD(BPF_REG_2, 0),
+ BPF_MOV64_IMM(BPF_REG_3, 0),
+ BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8),
+ BPF_ST_MEM(BPF_DW, BPF_REG_4, 0, 0),
+ BPF_MOV64_REG(BPF_REG_8, BPF_REG_4),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_packet_dequeue),
+ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
+ BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+ BPF_LD_MAP_FD(BPF_REG_2, 0),
+ BPF_MOV64_IMM(BPF_REG_3, 0),
+ BPF_MOV64_REG(BPF_REG_4, BPF_REG_8),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_packet_dequeue),
+ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
+ BPF_MOV64_REG(BPF_REG_0, BPF_REG_7),
+ BPF_EXIT_INSN(),
+ BPF_MOV64_REG(BPF_REG_8, BPF_REG_0),
+ BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_8, offsetof(struct xdp_md, data)),
+ BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_8, offsetof(struct xdp_md, data_end)),
+ BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_7, offsetof(struct xdp_md, data)),
+ BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_7, offsetof(struct xdp_md, data_end)),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 8),
+ BPF_JMP_REG(BPF_JGE, BPF_REG_0, BPF_REG_1, 1),
+ BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_2, 0),
+ BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+ BPF_MOV64_REG(BPF_REG_2, BPF_REG_7),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_packet_drop),
+ BPF_MOV64_REG(BPF_REG_0, BPF_REG_8),
+ BPF_EXIT_INSN(),
+ },
+ .prog_type = BPF_PROG_TYPE_DEQUEUE,
+ .result = REJECT,
+ .errstr = "invalid access to packet, off=0 size=4, R2(id=0,off=0,r=0)",
+ .fixup_map_pifo = { 1, 14 },
+},
--
2.37.0
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