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selftests/bpf: add verifier per-cpu cgroup storage tests
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This commits adds verifier tests covering per-cpu cgroup storage
functionality. There are 6 new tests, which are exactly the same
as for shared cgroup storage, but do use per-cpu cgroup storage
map.

Expected output:
  $ ./test_verifier
  #0/u add+sub+mul OK
  #0/p add+sub+mul OK
  ...
  torvalds#286/p invalid cgroup storage access 6 OK
  torvalds#287/p valid per-cpu cgroup storage access OK
  torvalds#288/p invalid per-cpu cgroup storage access 1 OK
  torvalds#289/p invalid per-cpu cgroup storage access 2 OK
  torvalds#290/p invalid per-cpu cgroup storage access 3 OK
  torvalds#291/p invalid per-cpu cgroup storage access 4 OK
  torvalds#292/p invalid per-cpu cgroup storage access 5 OK
  torvalds#293/p invalid per-cpu cgroup storage access 6 OK
  torvalds#294/p multiple registers share map_lookup_elem result OK
  ...
  torvalds#662/p mov64 src == dst OK
  torvalds#663/p mov64 src != dst OK
  Summary: 914 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: Roman Gushchin <guro@fb.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Alexei Starovoitov <ast@kernel.org>
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@rgushchin @intel-lab-lkp
rgushchin authored and intel-lab-lkp committed Sep 23, 2018
1 parent 079e356 commit 3505f73
Showing 1 changed file with 133 additions and 6 deletions.
139 changes: 133 additions & 6 deletions tools/testing/selftests/bpf/test_verifier.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -68,6 +68,7 @@ struct bpf_test {
int fixup_prog2[MAX_FIXUPS];
int fixup_map_in_map[MAX_FIXUPS];
int fixup_cgroup_storage[MAX_FIXUPS];
int fixup_percpu_cgroup_storage[MAX_FIXUPS];
const char *errstr;
const char *errstr_unpriv;
uint32_t retval;
Expand Down Expand Up @@ -4676,7 +4677,7 @@ static struct bpf_test tests[] = {
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
},
{
"invalid per-cgroup storage access 3",
"invalid cgroup storage access 3",
.insns = {
BPF_MOV64_IMM(BPF_REG_2, 0),
BPF_LD_MAP_FD(BPF_REG_1, 0),
Expand Down Expand Up @@ -4743,6 +4744,121 @@ static struct bpf_test tests[] = {
.errstr = "get_local_storage() doesn't support non-zero flags",
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
},
{
"valid per-cpu cgroup storage access",
.insns = {
BPF_MOV64_IMM(BPF_REG_2, 0),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_get_local_storage),
BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_0, BPF_REG_1),
BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 1),
BPF_EXIT_INSN(),
},
.fixup_percpu_cgroup_storage = { 1 },
.result = ACCEPT,
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
},
{
"invalid per-cpu cgroup storage access 1",
.insns = {
BPF_MOV64_IMM(BPF_REG_2, 0),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_get_local_storage),
BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_0, BPF_REG_1),
BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 1),
BPF_EXIT_INSN(),
},
.fixup_map1 = { 1 },
.result = REJECT,
.errstr = "cannot pass map_type 1 into func bpf_get_local_storage",
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
},
{
"invalid per-cpu cgroup storage access 2",
.insns = {
BPF_MOV64_IMM(BPF_REG_2, 0),
BPF_LD_MAP_FD(BPF_REG_1, 1),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_get_local_storage),
BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 1),
BPF_EXIT_INSN(),
},
.result = REJECT,
.errstr = "fd 1 is not pointing to valid bpf_map",
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
},
{
"invalid per-cpu cgroup storage access 3",
.insns = {
BPF_MOV64_IMM(BPF_REG_2, 0),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_get_local_storage),
BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_0, 256),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 1),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_percpu_cgroup_storage = { 1 },
.result = REJECT,
.errstr = "invalid access to map value, value_size=64 off=256 size=4",
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
},
{
"invalid per-cpu cgroup storage access 4",
.insns = {
BPF_MOV64_IMM(BPF_REG_2, 0),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_get_local_storage),
BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_0, -2),
BPF_MOV64_REG(BPF_REG_0, BPF_REG_1),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 1),
BPF_EXIT_INSN(),
},
.fixup_cgroup_storage = { 1 },
.result = REJECT,
.errstr = "invalid access to map value, value_size=64 off=-2 size=4",
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
},
{
"invalid per-cpu cgroup storage access 5",
.insns = {
BPF_MOV64_IMM(BPF_REG_2, 7),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_get_local_storage),
BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_0, BPF_REG_1),
BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 1),
BPF_EXIT_INSN(),
},
.fixup_percpu_cgroup_storage = { 1 },
.result = REJECT,
.errstr = "get_local_storage() doesn't support non-zero flags",
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
},
{
"invalid per-cpu cgroup storage access 6",
.insns = {
BPF_MOV64_REG(BPF_REG_2, BPF_REG_1),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_get_local_storage),
BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_0, BPF_REG_1),
BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 1),
BPF_EXIT_INSN(),
},
.fixup_percpu_cgroup_storage = { 1 },
.result = REJECT,
.errstr = "get_local_storage() doesn't support non-zero flags",
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
},
{
"multiple registers share map_lookup_elem result",
.insns = {
Expand Down Expand Up @@ -12615,15 +12731,17 @@ static int create_map_in_map(void)
return outer_map_fd;
}

static int create_cgroup_storage(void)
static int create_cgroup_storage(bool percpu)
{
enum bpf_map_type type = percpu ? BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE :
BPF_MAP_TYPE_CGROUP_STORAGE;
int fd;

fd = bpf_create_map(BPF_MAP_TYPE_CGROUP_STORAGE,
sizeof(struct bpf_cgroup_storage_key),
fd = bpf_create_map(type, sizeof(struct bpf_cgroup_storage_key),
TEST_DATA_LEN, 0, 0);
if (fd < 0)
printf("Failed to create array '%s'!\n", strerror(errno));
printf("Failed to create cgroup storage '%s'!\n",
strerror(errno));

return fd;
}
Expand All @@ -12641,6 +12759,7 @@ static void do_test_fixup(struct bpf_test *test, struct bpf_insn *prog,
int *fixup_prog2 = test->fixup_prog2;
int *fixup_map_in_map = test->fixup_map_in_map;
int *fixup_cgroup_storage = test->fixup_cgroup_storage;
int *fixup_percpu_cgroup_storage = test->fixup_percpu_cgroup_storage;

if (test->fill_helper)
test->fill_helper(test);
Expand Down Expand Up @@ -12710,12 +12829,20 @@ static void do_test_fixup(struct bpf_test *test, struct bpf_insn *prog,
}

if (*fixup_cgroup_storage) {
map_fds[7] = create_cgroup_storage();
map_fds[7] = create_cgroup_storage(false);
do {
prog[*fixup_cgroup_storage].imm = map_fds[7];
fixup_cgroup_storage++;
} while (*fixup_cgroup_storage);
}

if (*fixup_percpu_cgroup_storage) {
map_fds[8] = create_cgroup_storage(true);
do {
prog[*fixup_percpu_cgroup_storage].imm = map_fds[8];
fixup_percpu_cgroup_storage++;
} while (*fixup_percpu_cgroup_storage);
}
}

static void do_test_single(struct bpf_test *test, bool unpriv,
Expand Down

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