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Message-ID: <CAEf4BzZPt_HwFiECemTsgXsE7J418rNa554-RZoPowrEosoXQA@mail.gmail.com>
Date: Thu, 13 Jun 2019 15:09:24 -0700
From: Andrii Nakryiko <andrii.nakryiko@...il.com>
To: Alexei Starovoitov <ast@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>,
Daniel Borkmann <daniel@...earbox.net>,
Jakub Kicinski <jakub.kicinski@...ronome.com>,
Edward Cree <ecree@...arflare.com>,
john fastabend <john.fastabend@...il.com>,
Andrii Nakryiko <andriin@...com>, Jann Horn <jannh@...gle.com>,
Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
Kernel Team <kernel-team@...com>
Subject: Re: [PATCH bpf-next 2/9] selftests/bpf: fix tests due to const spill/fill
On Thu, Jun 13, 2019 at 9:50 AM Alexei Starovoitov <ast@...nel.org> wrote:
>
> fix tests that incorrectly assumed that the verifier
> cannot track constants through stack.
>
> Signed-off-by: Alexei Starovoitov <ast@...nel.org>
> ---
Acked-by: Andrii Nakryiko <andriin@...com>
> .../bpf/verifier/direct_packet_access.c | 3 +-
> .../bpf/verifier/helper_access_var_len.c | 28 ++++++++++---------
> 2 files changed, 17 insertions(+), 14 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/verifier/direct_packet_access.c b/tools/testing/selftests/bpf/verifier/direct_packet_access.c
> index d5c596fdc4b9..2c5fbe7bcd27 100644
> --- a/tools/testing/selftests/bpf/verifier/direct_packet_access.c
> +++ b/tools/testing/selftests/bpf/verifier/direct_packet_access.c
> @@ -511,7 +511,8 @@
> offsetof(struct __sk_buff, data)),
> BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
> offsetof(struct __sk_buff, data_end)),
> - BPF_MOV64_IMM(BPF_REG_0, 0xffffffff),
> + BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
> + offsetof(struct __sk_buff, mark)),
> BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -8),
> BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
> BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 0xffff),
> diff --git a/tools/testing/selftests/bpf/verifier/helper_access_var_len.c b/tools/testing/selftests/bpf/verifier/helper_access_var_len.c
> index 1f39d845c64f..67ab12410050 100644
> --- a/tools/testing/selftests/bpf/verifier/helper_access_var_len.c
> +++ b/tools/testing/selftests/bpf/verifier/helper_access_var_len.c
> @@ -29,9 +29,9 @@
> {
> "helper access to variable memory: stack, bitwise AND, zero included",
> .insns = {
> + BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_1, 8),
> BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
> BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -64),
> - BPF_MOV64_IMM(BPF_REG_2, 16),
> BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_2, -128),
> BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_1, -128),
> BPF_ALU64_IMM(BPF_AND, BPF_REG_2, 64),
> @@ -46,9 +46,9 @@
> {
> "helper access to variable memory: stack, bitwise AND + JMP, wrong max",
> .insns = {
> + BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_1, 8),
> BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
> BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -64),
> - BPF_MOV64_IMM(BPF_REG_2, 16),
> BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_2, -128),
> BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_1, -128),
> BPF_ALU64_IMM(BPF_AND, BPF_REG_2, 65),
> @@ -122,9 +122,9 @@
> {
> "helper access to variable memory: stack, JMP, bounds + offset",
> .insns = {
> + BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_1, 8),
> BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
> BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -64),
> - BPF_MOV64_IMM(BPF_REG_2, 16),
> BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_2, -128),
> BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_1, -128),
> BPF_JMP_IMM(BPF_JGT, BPF_REG_2, 64, 5),
> @@ -143,9 +143,9 @@
> {
> "helper access to variable memory: stack, JMP, wrong max",
> .insns = {
> + BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_1, 8),
> BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
> BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -64),
> - BPF_MOV64_IMM(BPF_REG_2, 16),
> BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_2, -128),
> BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_1, -128),
> BPF_JMP_IMM(BPF_JGT, BPF_REG_2, 65, 4),
> @@ -163,9 +163,9 @@
> {
> "helper access to variable memory: stack, JMP, no max check",
> .insns = {
> + BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_1, 8),
> BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
> BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -64),
> - BPF_MOV64_IMM(BPF_REG_2, 16),
> BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_2, -128),
> BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_1, -128),
> BPF_MOV64_IMM(BPF_REG_4, 0),
> @@ -183,9 +183,9 @@
> {
> "helper access to variable memory: stack, JMP, no min check",
> .insns = {
> + BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_1, 8),
> BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
> BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -64),
> - BPF_MOV64_IMM(BPF_REG_2, 16),
> BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_2, -128),
> BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_1, -128),
> BPF_JMP_IMM(BPF_JGT, BPF_REG_2, 64, 3),
> @@ -201,9 +201,9 @@
> {
> "helper access to variable memory: stack, JMP (signed), no min check",
> .insns = {
> + BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_1, 8),
> BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
> BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -64),
> - BPF_MOV64_IMM(BPF_REG_2, 16),
> BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_2, -128),
> BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_1, -128),
> BPF_JMP_IMM(BPF_JSGT, BPF_REG_2, 64, 3),
> @@ -244,6 +244,7 @@
> {
> "helper access to variable memory: map, JMP, wrong max",
> .insns = {
> + BPF_LDX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, 8),
> BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
> BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
> BPF_ST_MEM(BPF_DW, BPF_REG_2, 0, 0),
> @@ -251,7 +252,7 @@
> BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
> BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 10),
> BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
> - BPF_MOV64_IMM(BPF_REG_2, sizeof(struct test_val)),
> + BPF_MOV64_REG(BPF_REG_2, BPF_REG_6),
> BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -128),
> BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_10, -128),
> BPF_JMP_IMM(BPF_JSGT, BPF_REG_2, sizeof(struct test_val) + 1, 4),
> @@ -262,7 +263,7 @@
> BPF_MOV64_IMM(BPF_REG_0, 0),
> BPF_EXIT_INSN(),
> },
> - .fixup_map_hash_48b = { 3 },
> + .fixup_map_hash_48b = { 4 },
> .errstr = "invalid access to map value, value_size=48 off=0 size=49",
> .result = REJECT,
> .prog_type = BPF_PROG_TYPE_TRACEPOINT,
> @@ -296,6 +297,7 @@
> {
> "helper access to variable memory: map adjusted, JMP, wrong max",
> .insns = {
> + BPF_LDX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, 8),
> BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
> BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
> BPF_ST_MEM(BPF_DW, BPF_REG_2, 0, 0),
> @@ -304,7 +306,7 @@
> BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 11),
> BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
> BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 20),
> - BPF_MOV64_IMM(BPF_REG_2, sizeof(struct test_val)),
> + BPF_MOV64_REG(BPF_REG_2, BPF_REG_6),
> BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -128),
> BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_10, -128),
> BPF_JMP_IMM(BPF_JSGT, BPF_REG_2, sizeof(struct test_val) - 19, 4),
> @@ -315,7 +317,7 @@
> BPF_MOV64_IMM(BPF_REG_0, 0),
> BPF_EXIT_INSN(),
> },
> - .fixup_map_hash_48b = { 3 },
> + .fixup_map_hash_48b = { 4 },
> .errstr = "R1 min value is outside of the array range",
> .result = REJECT,
> .prog_type = BPF_PROG_TYPE_TRACEPOINT,
> @@ -337,8 +339,8 @@
> {
> "helper access to variable memory: size > 0 not allowed on NULL (ARG_PTR_TO_MEM_OR_NULL)",
> .insns = {
> + BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1, 0),
> BPF_MOV64_IMM(BPF_REG_1, 0),
> - BPF_MOV64_IMM(BPF_REG_2, 1),
> BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -128),
> BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_10, -128),
> BPF_ALU64_IMM(BPF_AND, BPF_REG_2, 64),
> @@ -562,6 +564,7 @@
> {
> "helper access to variable memory: 8 bytes leak",
> .insns = {
> + BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_1, 8),
> BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
> BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -64),
> BPF_MOV64_IMM(BPF_REG_0, 0),
> @@ -572,7 +575,6 @@
> BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -24),
> BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -16),
> BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -8),
> - BPF_MOV64_IMM(BPF_REG_2, 1),
> BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -128),
> BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_10, -128),
> BPF_ALU64_IMM(BPF_AND, BPF_REG_2, 63),
> --
> 2.20.0
>
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