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authorDaniel Borkmann <daniel@iogearbox.net>2016-04-13 00:10:54 +0200
committerDavid S. Miller <davem@davemloft.net>2016-04-14 21:40:42 -0400
commit3f2050e20e6f3a762eb08397db651dcec9498998 (patch)
tree8fe6af71ebb2dca7862b47c7514e27f2a7e12da3 /samples
parent02413cabd6b67f1444f153ea85d44076deae2056 (diff)
downloadlinux-3f2050e20e6f3a762eb08397db651dcec9498998.tar.gz
bpf, samples: add test cases for raw stack
This adds test cases mostly around ARG_PTR_TO_RAW_STACK to check the verifier behaviour. [...] #84 raw_stack: no skb_load_bytes OK #85 raw_stack: skb_load_bytes, no init OK #86 raw_stack: skb_load_bytes, init OK #87 raw_stack: skb_load_bytes, spilled regs around bounds OK #88 raw_stack: skb_load_bytes, spilled regs corruption OK #89 raw_stack: skb_load_bytes, spilled regs corruption 2 OK #90 raw_stack: skb_load_bytes, spilled regs + data OK #91 raw_stack: skb_load_bytes, invalid access 1 OK #92 raw_stack: skb_load_bytes, invalid access 2 OK #93 raw_stack: skb_load_bytes, invalid access 3 OK #94 raw_stack: skb_load_bytes, invalid access 4 OK #95 raw_stack: skb_load_bytes, invalid access 5 OK #96 raw_stack: skb_load_bytes, invalid access 6 OK #97 raw_stack: skb_load_bytes, large access OK Summary: 98 PASSED, 0 FAILED Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'samples')
-rw-r--r--samples/bpf/test_verifier.c268
1 files changed, 268 insertions, 0 deletions
diff --git a/samples/bpf/test_verifier.c b/samples/bpf/test_verifier.c
index 4b51a9039c0d..9eba8d1d9dcc 100644
--- a/samples/bpf/test_verifier.c
+++ b/samples/bpf/test_verifier.c
@@ -309,6 +309,19 @@ static struct bpf_test tests[] = {
.result_unpriv = REJECT,
},
{
+ "check valid spill/fill, skb mark",
+ .insns = {
+ BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_1),
+ BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_6, -8),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
+ BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_0,
+ offsetof(struct __sk_buff, mark)),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .result_unpriv = ACCEPT,
+ },
+ {
"check corrupted spill/fill",
.insns = {
/* spill R1(ctx) into stack */
@@ -1180,6 +1193,261 @@ static struct bpf_test tests[] = {
.result_unpriv = REJECT,
.result = ACCEPT,
},
+ {
+ "raw_stack: no skb_load_bytes",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_2, 4),
+ BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, -8),
+ BPF_MOV64_REG(BPF_REG_3, BPF_REG_6),
+ BPF_MOV64_IMM(BPF_REG_4, 8),
+ /* Call to skb_load_bytes() omitted. */
+ BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_6, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = REJECT,
+ .errstr = "invalid read from stack off -8+0 size 8",
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ },
+ {
+ "raw_stack: skb_load_bytes, no init",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_2, 4),
+ BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, -8),
+ BPF_MOV64_REG(BPF_REG_3, BPF_REG_6),
+ BPF_MOV64_IMM(BPF_REG_4, 8),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_skb_load_bytes),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_6, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ },
+ {
+ "raw_stack: skb_load_bytes, init",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_2, 4),
+ BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, -8),
+ BPF_ST_MEM(BPF_DW, BPF_REG_6, 0, 0xcafe),
+ BPF_MOV64_REG(BPF_REG_3, BPF_REG_6),
+ BPF_MOV64_IMM(BPF_REG_4, 8),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_skb_load_bytes),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_6, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ },
+ {
+ "raw_stack: skb_load_bytes, spilled regs around bounds",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_2, 4),
+ BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, -16),
+ BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, -8), /* spill ctx from R1 */
+ BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, 8), /* spill ctx from R1 */
+ BPF_MOV64_REG(BPF_REG_3, BPF_REG_6),
+ BPF_MOV64_IMM(BPF_REG_4, 8),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_skb_load_bytes),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_6, -8), /* fill ctx into R0 */
+ BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_6, 8), /* fill ctx into R2 */
+ BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_0,
+ offsetof(struct __sk_buff, mark)),
+ BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_2,
+ offsetof(struct __sk_buff, priority)),
+ BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_2),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ },
+ {
+ "raw_stack: skb_load_bytes, spilled regs corruption",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_2, 4),
+ BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, -8),
+ BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, 0), /* spill ctx from R1 */
+ BPF_MOV64_REG(BPF_REG_3, BPF_REG_6),
+ BPF_MOV64_IMM(BPF_REG_4, 8),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_skb_load_bytes),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_6, 0), /* fill ctx into R0 */
+ BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_0,
+ offsetof(struct __sk_buff, mark)),
+ BPF_EXIT_INSN(),
+ },
+ .result = REJECT,
+ .errstr = "R0 invalid mem access 'inv'",
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ },
+ {
+ "raw_stack: skb_load_bytes, spilled regs corruption 2",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_2, 4),
+ BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, -16),
+ BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, -8), /* spill ctx from R1 */
+ BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, 0), /* spill ctx from R1 */
+ BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, 8), /* spill ctx from R1 */
+ BPF_MOV64_REG(BPF_REG_3, BPF_REG_6),
+ BPF_MOV64_IMM(BPF_REG_4, 8),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_skb_load_bytes),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_6, -8), /* fill ctx into R0 */
+ BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_6, 8), /* fill ctx into R2 */
+ BPF_LDX_MEM(BPF_DW, BPF_REG_3, BPF_REG_6, 0), /* fill ctx into R3 */
+ BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_0,
+ offsetof(struct __sk_buff, mark)),
+ BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_2,
+ offsetof(struct __sk_buff, priority)),
+ BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_2),
+ BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_3,
+ offsetof(struct __sk_buff, pkt_type)),
+ BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_3),
+ BPF_EXIT_INSN(),
+ },
+ .result = REJECT,
+ .errstr = "R3 invalid mem access 'inv'",
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ },
+ {
+ "raw_stack: skb_load_bytes, spilled regs + data",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_2, 4),
+ BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, -16),
+ BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, -8), /* spill ctx from R1 */
+ BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, 0), /* spill ctx from R1 */
+ BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, 8), /* spill ctx from R1 */
+ BPF_MOV64_REG(BPF_REG_3, BPF_REG_6),
+ BPF_MOV64_IMM(BPF_REG_4, 8),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_skb_load_bytes),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_6, -8), /* fill ctx into R0 */
+ BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_6, 8), /* fill ctx into R2 */
+ BPF_LDX_MEM(BPF_DW, BPF_REG_3, BPF_REG_6, 0), /* fill data into R3 */
+ BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_0,
+ offsetof(struct __sk_buff, mark)),
+ BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_2,
+ offsetof(struct __sk_buff, priority)),
+ BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_2),
+ BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_3),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ },
+ {
+ "raw_stack: skb_load_bytes, invalid access 1",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_2, 4),
+ BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, -513),
+ BPF_MOV64_REG(BPF_REG_3, BPF_REG_6),
+ BPF_MOV64_IMM(BPF_REG_4, 8),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_skb_load_bytes),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_6, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = REJECT,
+ .errstr = "invalid stack type R3 off=-513 access_size=8",
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ },
+ {
+ "raw_stack: skb_load_bytes, invalid access 2",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_2, 4),
+ BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, -1),
+ BPF_MOV64_REG(BPF_REG_3, BPF_REG_6),
+ BPF_MOV64_IMM(BPF_REG_4, 8),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_skb_load_bytes),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_6, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = REJECT,
+ .errstr = "invalid stack type R3 off=-1 access_size=8",
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ },
+ {
+ "raw_stack: skb_load_bytes, invalid access 3",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_2, 4),
+ BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, 0xffffffff),
+ BPF_MOV64_REG(BPF_REG_3, BPF_REG_6),
+ BPF_MOV64_IMM(BPF_REG_4, 0xffffffff),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_skb_load_bytes),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_6, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = REJECT,
+ .errstr = "invalid stack type R3 off=-1 access_size=-1",
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ },
+ {
+ "raw_stack: skb_load_bytes, invalid access 4",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_2, 4),
+ BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, -1),
+ BPF_MOV64_REG(BPF_REG_3, BPF_REG_6),
+ BPF_MOV64_IMM(BPF_REG_4, 0x7fffffff),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_skb_load_bytes),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_6, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = REJECT,
+ .errstr = "invalid stack type R3 off=-1 access_size=2147483647",
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ },
+ {
+ "raw_stack: skb_load_bytes, invalid access 5",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_2, 4),
+ BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, -512),
+ BPF_MOV64_REG(BPF_REG_3, BPF_REG_6),
+ BPF_MOV64_IMM(BPF_REG_4, 0x7fffffff),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_skb_load_bytes),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_6, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = REJECT,
+ .errstr = "invalid stack type R3 off=-512 access_size=2147483647",
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ },
+ {
+ "raw_stack: skb_load_bytes, invalid access 6",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_2, 4),
+ BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, -512),
+ BPF_MOV64_REG(BPF_REG_3, BPF_REG_6),
+ BPF_MOV64_IMM(BPF_REG_4, 0),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_skb_load_bytes),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_6, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = REJECT,
+ .errstr = "invalid stack type R3 off=-512 access_size=0",
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ },
+ {
+ "raw_stack: skb_load_bytes, large access",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_2, 4),
+ BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, -512),
+ BPF_MOV64_REG(BPF_REG_3, BPF_REG_6),
+ BPF_MOV64_IMM(BPF_REG_4, 512),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_skb_load_bytes),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_6, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ },
};
static int probe_filter_length(struct bpf_insn *fp)