selftests/bpf: Add tests for reference tracking
reference tracking: leak potential reference reference tracking: leak potential reference on stack reference tracking: leak potential reference on stack 2 reference tracking: zero potential reference reference tracking: copy and zero potential references reference tracking: release reference without check reference tracking: release reference reference tracking: release reference twice reference tracking: release reference twice inside branch reference tracking: alloc, check, free in one subbranch reference tracking: alloc, check, free in both subbranches reference tracking in call: free reference in subprog reference tracking in call: free reference in subprog and outside reference tracking in call: alloc & leak reference in subprog reference tracking in call: alloc in subprog, release outside reference tracking in call: sk_ptr leak into caller stack reference tracking in call: sk_ptr spill into caller stack reference tracking: allow LD_ABS reference tracking: forbid LD_ABS while holding reference reference tracking: allow LD_IND reference tracking: forbid LD_IND while holding reference reference tracking: check reference or tail call reference tracking: release reference then tail call reference tracking: leak possible reference over tail call reference tracking: leak checked reference over tail call reference tracking: mangle and release sock_or_null reference tracking: mangle and release sock reference tracking: access member reference tracking: write to member reference tracking: invalid 64-bit access of member reference tracking: access after release reference tracking: direct access for lookup unpriv: spill/fill of different pointers stx - ctx and sock unpriv: spill/fill of different pointers stx - leak sock unpriv: spill/fill of different pointers stx - sock and ctx (read) unpriv: spill/fill of different pointers stx - sock and ctx (write) Signed-off-by: Joe Stringer <joe@wand.net.nz> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Joe Stringer
Daniel Borkmann
Родитель
0c586079f8
Коммит
b584ab8840
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@ -3,6 +3,7 @@
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*
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* Copyright (c) 2014 PLUMgrid, http://plumgrid.com
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* Copyright (c) 2017 Facebook
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* Copyright (c) 2018 Covalent IO, Inc. http://covalent.io
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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@ -178,6 +179,24 @@ static void bpf_fill_rand_ld_dw(struct bpf_test *self)
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self->retval = (uint32_t)res;
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}
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/* BPF_SK_LOOKUP contains 13 instructions, if you need to fix up maps */
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#define BPF_SK_LOOKUP \
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/* struct bpf_sock_tuple tuple = {} */ \
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BPF_MOV64_IMM(BPF_REG_2, 0), \
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BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_2, -8), \
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BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -16), \
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BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -24), \
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BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -32), \
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BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -40), \
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BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -48), \
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/* sk = sk_lookup_tcp(ctx, &tuple, sizeof tuple, 0, 0) */ \
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10), \
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -48), \
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BPF_MOV64_IMM(BPF_REG_3, sizeof(struct bpf_sock_tuple)), \
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BPF_MOV64_IMM(BPF_REG_4, 0), \
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BPF_MOV64_IMM(BPF_REG_5, 0), \
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BPF_EMIT_CALL(BPF_FUNC_sk_lookup_tcp)
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static struct bpf_test tests[] = {
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{
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"add+sub+mul",
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@ -2707,6 +2726,137 @@ static struct bpf_test tests[] = {
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.errstr = "same insn cannot be used with different pointers",
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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},
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{
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"unpriv: spill/fill of different pointers stx - ctx and sock",
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.insns = {
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BPF_MOV64_REG(BPF_REG_8, BPF_REG_1),
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/* struct bpf_sock *sock = bpf_sock_lookup(...); */
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BPF_SK_LOOKUP,
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
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/* u64 foo; */
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/* void *target = &foo; */
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BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, -8),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_8),
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/* if (skb == NULL) *target = sock; */
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 1),
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BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_2, 0),
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/* else *target = skb; */
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BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 1),
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BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, 0),
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/* struct __sk_buff *skb = *target; */
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BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_6, 0),
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/* skb->mark = 42; */
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BPF_MOV64_IMM(BPF_REG_3, 42),
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BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_3,
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offsetof(struct __sk_buff, mark)),
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/* if (sk) bpf_sk_release(sk) */
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 1),
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.result = REJECT,
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.errstr = "type=ctx expected=sock",
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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},
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{
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"unpriv: spill/fill of different pointers stx - leak sock",
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.insns = {
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BPF_MOV64_REG(BPF_REG_8, BPF_REG_1),
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/* struct bpf_sock *sock = bpf_sock_lookup(...); */
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BPF_SK_LOOKUP,
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
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/* u64 foo; */
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/* void *target = &foo; */
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BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, -8),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_8),
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/* if (skb == NULL) *target = sock; */
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 1),
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BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_2, 0),
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/* else *target = skb; */
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BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 1),
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BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, 0),
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/* struct __sk_buff *skb = *target; */
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BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_6, 0),
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/* skb->mark = 42; */
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BPF_MOV64_IMM(BPF_REG_3, 42),
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BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_3,
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offsetof(struct __sk_buff, mark)),
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BPF_EXIT_INSN(),
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},
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.result = REJECT,
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//.errstr = "same insn cannot be used with different pointers",
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.errstr = "Unreleased reference",
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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},
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{
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"unpriv: spill/fill of different pointers stx - sock and ctx (read)",
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.insns = {
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BPF_MOV64_REG(BPF_REG_8, BPF_REG_1),
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/* struct bpf_sock *sock = bpf_sock_lookup(...); */
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BPF_SK_LOOKUP,
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
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/* u64 foo; */
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/* void *target = &foo; */
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BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, -8),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_8),
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/* if (skb) *target = skb */
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 1),
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BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, 0),
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/* else *target = sock */
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BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 1),
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BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_2, 0),
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/* struct bpf_sock *sk = *target; */
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BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_6, 0),
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/* if (sk) u32 foo = sk->mark; bpf_sk_release(sk); */
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 2),
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BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
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offsetof(struct bpf_sock, mark)),
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.result = REJECT,
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.errstr = "same insn cannot be used with different pointers",
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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},
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{
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"unpriv: spill/fill of different pointers stx - sock and ctx (write)",
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.insns = {
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BPF_MOV64_REG(BPF_REG_8, BPF_REG_1),
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/* struct bpf_sock *sock = bpf_sock_lookup(...); */
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BPF_SK_LOOKUP,
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
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/* u64 foo; */
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/* void *target = &foo; */
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BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, -8),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_8),
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/* if (skb) *target = skb */
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 1),
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BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, 0),
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/* else *target = sock */
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BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 1),
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BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_2, 0),
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/* struct bpf_sock *sk = *target; */
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BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_6, 0),
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/* if (sk) sk->mark = 42; bpf_sk_release(sk); */
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 3),
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BPF_MOV64_IMM(BPF_REG_3, 42),
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BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_3,
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offsetof(struct bpf_sock, mark)),
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.result = REJECT,
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//.errstr = "same insn cannot be used with different pointers",
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.errstr = "cannot write into socket",
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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},
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{
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"unpriv: spill/fill of different pointers ldx",
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.insns = {
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@ -12557,6 +12707,214 @@ static struct bpf_test tests[] = {
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.result = ACCEPT,
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},
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{
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"reference tracking: leak potential reference",
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.insns = {
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BPF_SK_LOOKUP,
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BPF_MOV64_REG(BPF_REG_6, BPF_REG_0), /* leak reference */
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.errstr = "Unreleased reference",
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.result = REJECT,
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},
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{
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"reference tracking: leak potential reference on stack",
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.insns = {
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BPF_SK_LOOKUP,
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BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8),
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BPF_STX_MEM(BPF_DW, BPF_REG_4, BPF_REG_0, 0),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.errstr = "Unreleased reference",
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.result = REJECT,
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},
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{
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"reference tracking: leak potential reference on stack 2",
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.insns = {
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BPF_SK_LOOKUP,
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BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8),
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BPF_STX_MEM(BPF_DW, BPF_REG_4, BPF_REG_0, 0),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_ST_MEM(BPF_DW, BPF_REG_4, 0, 0),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.errstr = "Unreleased reference",
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.result = REJECT,
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},
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{
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"reference tracking: zero potential reference",
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.insns = {
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BPF_SK_LOOKUP,
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BPF_MOV64_IMM(BPF_REG_0, 0), /* leak reference */
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.errstr = "Unreleased reference",
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.result = REJECT,
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},
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{
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"reference tracking: copy and zero potential references",
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.insns = {
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BPF_SK_LOOKUP,
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BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_MOV64_IMM(BPF_REG_7, 0), /* leak reference */
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.errstr = "Unreleased reference",
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.result = REJECT,
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},
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{
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"reference tracking: release reference without check",
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.insns = {
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BPF_SK_LOOKUP,
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/* reference in r0 may be NULL */
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_MOV64_IMM(BPF_REG_2, 0),
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.errstr = "type=sock_or_null expected=sock",
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.result = REJECT,
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},
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{
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"reference tracking: release reference",
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.insns = {
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BPF_SK_LOOKUP,
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.result = ACCEPT,
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},
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{
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"reference tracking: release reference 2",
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.insns = {
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BPF_SK_LOOKUP,
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.result = ACCEPT,
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},
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{
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"reference tracking: release reference twice",
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.insns = {
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BPF_SK_LOOKUP,
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.errstr = "type=inv expected=sock",
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.result = REJECT,
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},
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{
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"reference tracking: release reference twice inside branch",
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.insns = {
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BPF_SK_LOOKUP,
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 3), /* goto end */
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.errstr = "type=inv expected=sock",
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.result = REJECT,
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},
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{
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"reference tracking: alloc, check, free in one subbranch",
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.insns = {
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BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
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offsetof(struct __sk_buff, data)),
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BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
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offsetof(struct __sk_buff, data_end)),
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BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 16),
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/* if (offsetof(skb, mark) > data_len) exit; */
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BPF_JMP_REG(BPF_JLE, BPF_REG_0, BPF_REG_3, 1),
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BPF_EXIT_INSN(),
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BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_2,
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offsetof(struct __sk_buff, mark)),
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BPF_SK_LOOKUP,
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 1), /* mark == 0? */
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/* Leak reference in R0 */
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BPF_EXIT_INSN(),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2), /* sk NULL? */
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.errstr = "Unreleased reference",
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.result = REJECT,
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},
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{
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"reference tracking: alloc, check, free in both subbranches",
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.insns = {
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BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
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offsetof(struct __sk_buff, data)),
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BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
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offsetof(struct __sk_buff, data_end)),
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BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 16),
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/* if (offsetof(skb, mark) > data_len) exit; */
|
||||
BPF_JMP_REG(BPF_JLE, BPF_REG_0, BPF_REG_3, 1),
|
||||
BPF_EXIT_INSN(),
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_2,
|
||||
offsetof(struct __sk_buff, mark)),
|
||||
BPF_SK_LOOKUP,
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 4), /* mark == 0? */
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2), /* sk NULL? */
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
||||
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
||||
BPF_EXIT_INSN(),
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2), /* sk NULL? */
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
||||
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
.result = ACCEPT,
|
||||
},
|
||||
{
|
||||
"reference tracking in call: free reference in subprog",
|
||||
.insns = {
|
||||
BPF_SK_LOOKUP,
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0), /* unchecked reference */
|
||||
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
|
||||
BPF_MOV64_IMM(BPF_REG_0, 0),
|
||||
BPF_EXIT_INSN(),
|
||||
|
||||
/* subprog 1 */
|
||||
BPF_MOV64_REG(BPF_REG_2, BPF_REG_1),
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_2, 0, 1),
|
||||
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
.result = ACCEPT,
|
||||
},
|
||||
{
|
||||
"pass modified ctx pointer to helper, 1",
|
||||
.insns = {
|
||||
|
|
@ -12627,6 +12985,407 @@ static struct bpf_test tests[] = {
|
|||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
.result = ACCEPT,
|
||||
},
|
||||
{
|
||||
"reference tracking in call: free reference in subprog and outside",
|
||||
.insns = {
|
||||
BPF_SK_LOOKUP,
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0), /* unchecked reference */
|
||||
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
||||
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
||||
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
||||
BPF_EXIT_INSN(),
|
||||
|
||||
/* subprog 1 */
|
||||
BPF_MOV64_REG(BPF_REG_2, BPF_REG_1),
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_2, 0, 1),
|
||||
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
.errstr = "type=inv expected=sock",
|
||||
.result = REJECT,
|
||||
},
|
||||
{
|
||||
"reference tracking in call: alloc & leak reference in subprog",
|
||||
.insns = {
|
||||
BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),
|
||||
BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8),
|
||||
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
||||
BPF_MOV64_IMM(BPF_REG_0, 0),
|
||||
BPF_EXIT_INSN(),
|
||||
|
||||
/* subprog 1 */
|
||||
BPF_MOV64_REG(BPF_REG_6, BPF_REG_4),
|
||||
BPF_SK_LOOKUP,
|
||||
/* spill unchecked sk_ptr into stack of caller */
|
||||
BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_0, 0),
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
.errstr = "Unreleased reference",
|
||||
.result = REJECT,
|
||||
},
|
||||
{
|
||||
"reference tracking in call: alloc in subprog, release outside",
|
||||
.insns = {
|
||||
BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),
|
||||
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 4),
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
|
||||
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
||||
BPF_EXIT_INSN(),
|
||||
|
||||
/* subprog 1 */
|
||||
BPF_SK_LOOKUP,
|
||||
BPF_EXIT_INSN(), /* return sk */
|
||||
},
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
.retval = POINTER_VALUE,
|
||||
.result = ACCEPT,
|
||||
},
|
||||
{
|
||||
"reference tracking in call: sk_ptr leak into caller stack",
|
||||
.insns = {
|
||||
BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),
|
||||
BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8),
|
||||
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
|
||||
BPF_MOV64_IMM(BPF_REG_0, 0),
|
||||
BPF_EXIT_INSN(),
|
||||
|
||||
/* subprog 1 */
|
||||
BPF_MOV64_REG(BPF_REG_5, BPF_REG_10),
|
||||
BPF_ALU64_IMM(BPF_ADD, BPF_REG_5, -8),
|
||||
BPF_STX_MEM(BPF_DW, BPF_REG_5, BPF_REG_4, 0),
|
||||
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 5),
|
||||
/* spill unchecked sk_ptr into stack of caller */
|
||||
BPF_MOV64_REG(BPF_REG_5, BPF_REG_10),
|
||||
BPF_ALU64_IMM(BPF_ADD, BPF_REG_5, -8),
|
||||
BPF_LDX_MEM(BPF_DW, BPF_REG_4, BPF_REG_5, 0),
|
||||
BPF_STX_MEM(BPF_DW, BPF_REG_4, BPF_REG_0, 0),
|
||||
BPF_EXIT_INSN(),
|
||||
|
||||
/* subprog 2 */
|
||||
BPF_SK_LOOKUP,
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
.errstr = "Unreleased reference",
|
||||
.result = REJECT,
|
||||
},
|
||||
{
|
||||
"reference tracking in call: sk_ptr spill into caller stack",
|
||||
.insns = {
|
||||
BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),
|
||||
BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8),
|
||||
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
|
||||
BPF_MOV64_IMM(BPF_REG_0, 0),
|
||||
BPF_EXIT_INSN(),
|
||||
|
||||
/* subprog 1 */
|
||||
BPF_MOV64_REG(BPF_REG_5, BPF_REG_10),
|
||||
BPF_ALU64_IMM(BPF_ADD, BPF_REG_5, -8),
|
||||
BPF_STX_MEM(BPF_DW, BPF_REG_5, BPF_REG_4, 0),
|
||||
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 8),
|
||||
/* spill unchecked sk_ptr into stack of caller */
|
||||
BPF_MOV64_REG(BPF_REG_5, BPF_REG_10),
|
||||
BPF_ALU64_IMM(BPF_ADD, BPF_REG_5, -8),
|
||||
BPF_LDX_MEM(BPF_DW, BPF_REG_4, BPF_REG_5, 0),
|
||||
BPF_STX_MEM(BPF_DW, BPF_REG_4, BPF_REG_0, 0),
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2),
|
||||
/* now the sk_ptr is verified, free the reference */
|
||||
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_4, 0),
|
||||
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
||||
BPF_EXIT_INSN(),
|
||||
|
||||
/* subprog 2 */
|
||||
BPF_SK_LOOKUP,
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
.result = ACCEPT,
|
||||
},
|
||||
{
|
||||
"reference tracking: allow LD_ABS",
|
||||
.insns = {
|
||||
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
|
||||
BPF_SK_LOOKUP,
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
|
||||
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
||||
BPF_LD_ABS(BPF_B, 0),
|
||||
BPF_LD_ABS(BPF_H, 0),
|
||||
BPF_LD_ABS(BPF_W, 0),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
.result = ACCEPT,
|
||||
},
|
||||
{
|
||||
"reference tracking: forbid LD_ABS while holding reference",
|
||||
.insns = {
|
||||
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
|
||||
BPF_SK_LOOKUP,
|
||||
BPF_LD_ABS(BPF_B, 0),
|
||||
BPF_LD_ABS(BPF_H, 0),
|
||||
BPF_LD_ABS(BPF_W, 0),
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
|
||||
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
.errstr = "BPF_LD_[ABS|IND] cannot be mixed with socket references",
|
||||
.result = REJECT,
|
||||
},
|
||||
{
|
||||
"reference tracking: allow LD_IND",
|
||||
.insns = {
|
||||
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
|
||||
BPF_SK_LOOKUP,
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
|
||||
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
||||
BPF_MOV64_IMM(BPF_REG_7, 1),
|
||||
BPF_LD_IND(BPF_W, BPF_REG_7, -0x200000),
|
||||
BPF_MOV64_REG(BPF_REG_0, BPF_REG_7),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
.result = ACCEPT,
|
||||
.retval = 1,
|
||||
},
|
||||
{
|
||||
"reference tracking: forbid LD_IND while holding reference",
|
||||
.insns = {
|
||||
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
|
||||
BPF_SK_LOOKUP,
|
||||
BPF_MOV64_REG(BPF_REG_4, BPF_REG_0),
|
||||
BPF_MOV64_IMM(BPF_REG_7, 1),
|
||||
BPF_LD_IND(BPF_W, BPF_REG_7, -0x200000),
|
||||
BPF_MOV64_REG(BPF_REG_0, BPF_REG_7),
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_4),
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 1),
|
||||
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
.errstr = "BPF_LD_[ABS|IND] cannot be mixed with socket references",
|
||||
.result = REJECT,
|
||||
},
|
||||
{
|
||||
"reference tracking: check reference or tail call",
|
||||
.insns = {
|
||||
BPF_MOV64_REG(BPF_REG_7, BPF_REG_1),
|
||||
BPF_SK_LOOKUP,
|
||||
/* if (sk) bpf_sk_release() */
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
||||
BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 7),
|
||||
/* bpf_tail_call() */
|
||||
BPF_MOV64_IMM(BPF_REG_3, 2),
|
||||
BPF_LD_MAP_FD(BPF_REG_2, 0),
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
|
||||
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
|
||||
BPF_FUNC_tail_call),
|
||||
BPF_MOV64_IMM(BPF_REG_0, 0),
|
||||
BPF_EXIT_INSN(),
|
||||
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.fixup_prog1 = { 17 },
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
.result = ACCEPT,
|
||||
},
|
||||
{
|
||||
"reference tracking: release reference then tail call",
|
||||
.insns = {
|
||||
BPF_MOV64_REG(BPF_REG_7, BPF_REG_1),
|
||||
BPF_SK_LOOKUP,
|
||||
/* if (sk) bpf_sk_release() */
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 1),
|
||||
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
||||
/* bpf_tail_call() */
|
||||
BPF_MOV64_IMM(BPF_REG_3, 2),
|
||||
BPF_LD_MAP_FD(BPF_REG_2, 0),
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
|
||||
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
|
||||
BPF_FUNC_tail_call),
|
||||
BPF_MOV64_IMM(BPF_REG_0, 0),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.fixup_prog1 = { 18 },
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
.result = ACCEPT,
|
||||
},
|
||||
{
|
||||
"reference tracking: leak possible reference over tail call",
|
||||
.insns = {
|
||||
BPF_MOV64_REG(BPF_REG_7, BPF_REG_1),
|
||||
/* Look up socket and store in REG_6 */
|
||||
BPF_SK_LOOKUP,
|
||||
/* bpf_tail_call() */
|
||||
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
||||
BPF_MOV64_IMM(BPF_REG_3, 2),
|
||||
BPF_LD_MAP_FD(BPF_REG_2, 0),
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
|
||||
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
|
||||
BPF_FUNC_tail_call),
|
||||
BPF_MOV64_IMM(BPF_REG_0, 0),
|
||||
/* if (sk) bpf_sk_release() */
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 1),
|
||||
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.fixup_prog1 = { 16 },
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
.errstr = "tail_call would lead to reference leak",
|
||||
.result = REJECT,
|
||||
},
|
||||
{
|
||||
"reference tracking: leak checked reference over tail call",
|
||||
.insns = {
|
||||
BPF_MOV64_REG(BPF_REG_7, BPF_REG_1),
|
||||
/* Look up socket and store in REG_6 */
|
||||
BPF_SK_LOOKUP,
|
||||
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
||||
/* if (!sk) goto end */
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 7),
|
||||
/* bpf_tail_call() */
|
||||
BPF_MOV64_IMM(BPF_REG_3, 0),
|
||||
BPF_LD_MAP_FD(BPF_REG_2, 0),
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
|
||||
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
|
||||
BPF_FUNC_tail_call),
|
||||
BPF_MOV64_IMM(BPF_REG_0, 0),
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
||||
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.fixup_prog1 = { 17 },
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
.errstr = "tail_call would lead to reference leak",
|
||||
.result = REJECT,
|
||||
},
|
||||
{
|
||||
"reference tracking: mangle and release sock_or_null",
|
||||
.insns = {
|
||||
BPF_SK_LOOKUP,
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
||||
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 5),
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
|
||||
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
.errstr = "R1 pointer arithmetic on sock_or_null prohibited",
|
||||
.result = REJECT,
|
||||
},
|
||||
{
|
||||
"reference tracking: mangle and release sock",
|
||||
.insns = {
|
||||
BPF_SK_LOOKUP,
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2),
|
||||
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 5),
|
||||
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
.errstr = "R1 pointer arithmetic on sock prohibited",
|
||||
.result = REJECT,
|
||||
},
|
||||
{
|
||||
"reference tracking: access member",
|
||||
.insns = {
|
||||
BPF_SK_LOOKUP,
|
||||
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 3),
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_0, 4),
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
||||
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
.result = ACCEPT,
|
||||
},
|
||||
{
|
||||
"reference tracking: write to member",
|
||||
.insns = {
|
||||
BPF_SK_LOOKUP,
|
||||
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 5),
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
||||
BPF_LD_IMM64(BPF_REG_2, 42),
|
||||
BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_2,
|
||||
offsetof(struct bpf_sock, mark)),
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
||||
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
||||
BPF_LD_IMM64(BPF_REG_0, 0),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
.errstr = "cannot write into socket",
|
||||
.result = REJECT,
|
||||
},
|
||||
{
|
||||
"reference tracking: invalid 64-bit access of member",
|
||||
.insns = {
|
||||
BPF_SK_LOOKUP,
|
||||
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 3),
|
||||
BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_0, 0),
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
||||
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
.errstr = "invalid bpf_sock access off=0 size=8",
|
||||
.result = REJECT,
|
||||
},
|
||||
{
|
||||
"reference tracking: access after release",
|
||||
.insns = {
|
||||
BPF_SK_LOOKUP,
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2),
|
||||
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1, 0),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
.errstr = "!read_ok",
|
||||
.result = REJECT,
|
||||
},
|
||||
{
|
||||
"reference tracking: direct access for lookup",
|
||||
.insns = {
|
||||
/* Check that the packet is at least 64B long */
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
|
||||
offsetof(struct __sk_buff, data)),
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
|
||||
offsetof(struct __sk_buff, data_end)),
|
||||
BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
|
||||
BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 64),
|
||||
BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 9),
|
||||
/* sk = sk_lookup_tcp(ctx, skb->data, ...) */
|
||||
BPF_MOV64_IMM(BPF_REG_3, sizeof(struct bpf_sock_tuple)),
|
||||
BPF_MOV64_IMM(BPF_REG_4, 0),
|
||||
BPF_MOV64_IMM(BPF_REG_5, 0),
|
||||
BPF_EMIT_CALL(BPF_FUNC_sk_lookup_tcp),
|
||||
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 3),
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_0, 4),
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
||||
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
.result = ACCEPT,
|
||||
},
|
||||
};
|
||||
|
||||
static int probe_filter_length(const struct bpf_insn *fp)
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче