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bpf, selftests: Fix up some test_verifier cases for unprivileged 

Fix up test_verifier error messages for the case where the original error
message changed, or for the case where pointer alu errors differ between
privileged and unprivileged tests. Also, add alternative tests for keeping
coverage of the original verifier rejection error message (fp alu), and
newly reject map_ptr += rX where rX == 0 given we now forbid alu on these
types for unprivileged. All test_verifier cases pass after the change. The
test case fixups were kept separate to ease backporting of core changes.

Signed-off-by: Piotr Krysiuk <piotras@gmail.com>
Co-developed-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
rM2-mainline
Piotr Krysiuk 2021-03-16 11:44:42 +01:00 committed by Daniel Borkmann
parent 1b1597e64e
commit 0a13e3537e
4 changed files with 59 additions and 10 deletions
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27
tools/testing/selftests/bpf/verifier/bounds_deduction.c
View File

@ -6,8 +6,9 @@
BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
BPF_EXIT_INSN(),
},
.result = REJECT,
.errstr_unpriv = "R0 tried to sub from different maps, paths, or prohibited types",
.errstr = "R0 tried to subtract pointer from scalar",
.result = REJECT,
},
{
"check deducing bounds from const, 2",
@ -20,6 +21,8 @@
BPF_ALU64_REG(BPF_SUB, BPF_REG_1, BPF_REG_0),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "R1 tried to sub from different maps, paths, or prohibited types",
.result_unpriv = REJECT,
.result = ACCEPT,
.retval = 1,
},
@ -31,8 +34,9 @@
BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
BPF_EXIT_INSN(),
},
.result = REJECT,
.errstr_unpriv = "R0 tried to sub from different maps, paths, or prohibited types",
.errstr = "R0 tried to subtract pointer from scalar",
.result = REJECT,
},
{
"check deducing bounds from const, 4",
@ -45,6 +49,8 @@
BPF_ALU64_REG(BPF_SUB, BPF_REG_1, BPF_REG_0),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "R1 tried to sub from different maps, paths, or prohibited types",
.result_unpriv = REJECT,
.result = ACCEPT,
},
{
@ -55,8 +61,9 @@
BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
BPF_EXIT_INSN(),
},
.result = REJECT,
.errstr_unpriv = "R0 tried to sub from different maps, paths, or prohibited types",
.errstr = "R0 tried to subtract pointer from scalar",
.result = REJECT,
},
{
"check deducing bounds from const, 6",
@ -67,8 +74,9 @@
BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
BPF_EXIT_INSN(),
},
.result = REJECT,
.errstr_unpriv = "R0 tried to sub from different maps, paths, or prohibited types",
.errstr = "R0 tried to subtract pointer from scalar",
.result = REJECT,
},
{
"check deducing bounds from const, 7",
@ -80,8 +88,9 @@
offsetof(struct __sk_buff, mark)),
BPF_EXIT_INSN(),
},
.result = REJECT,
.errstr_unpriv = "R1 tried to sub from different maps, paths, or prohibited types",
.errstr = "dereference of modified ctx ptr",
.result = REJECT,
.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
},
{
@ -94,8 +103,9 @@
offsetof(struct __sk_buff, mark)),
BPF_EXIT_INSN(),
},
.result = REJECT,
.errstr_unpriv = "R1 tried to add from different maps, paths, or prohibited types",
.errstr = "dereference of modified ctx ptr",
.result = REJECT,
.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
},
{
@ -106,8 +116,9 @@
BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
BPF_EXIT_INSN(),
},
.result = REJECT,
.errstr_unpriv = "R0 tried to sub from different maps, paths, or prohibited types",
.errstr = "R0 tried to subtract pointer from scalar",
.result = REJECT,
},
{
"check deducing bounds from const, 10",
@ -119,6 +130,6 @@
BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
BPF_EXIT_INSN(),
},
.result = REJECT,
.errstr = "math between ctx pointer and register with unbounded min value is not allowed",
.result = REJECT,
},

4
tools/testing/selftests/bpf/verifier/map_ptr.c
View File

@ -75,6 +75,8 @@
BPF_EXIT_INSN(),
},
.fixup_map_hash_16b = { 4 },
.result_unpriv = REJECT,
.errstr_unpriv = "R1 tried to add from different maps, paths, or prohibited types",
.result = ACCEPT,
},
{
@ -91,5 +93,7 @@
BPF_EXIT_INSN(),
},
.fixup_map_hash_16b = { 4 },
.result_unpriv = REJECT,
.errstr_unpriv = "R1 tried to add from different maps, paths, or prohibited types",
.result = ACCEPT,
},

15
tools/testing/selftests/bpf/verifier/unpriv.c
View File

@ -497,7 +497,7 @@
.result = ACCEPT,
},
{
"unpriv: adding of fp",
"unpriv: adding of fp, reg",
.insns = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_MOV64_IMM(BPF_REG_1, 0),
@ -505,6 +505,19 @@
BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, -8),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "R1 tried to add from different maps, paths, or prohibited types",
.result_unpriv = REJECT,
.result = ACCEPT,
},
{
"unpriv: adding of fp, imm",
.insns = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 0),
BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, -8),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "R1 stack pointer arithmetic goes out of range",
.result_unpriv = REJECT,
.result = ACCEPT,

23
tools/testing/selftests/bpf/verifier/value_ptr_arith.c
View File

@ -169,7 +169,7 @@
.fixup_map_array_48b = { 1 },
.result = ACCEPT,
.result_unpriv = REJECT,
.errstr_unpriv = "R2 tried to add from different maps or paths",
.errstr_unpriv = "R2 tried to add from different maps, paths, or prohibited types",
.retval = 0,
},
{
@ -516,6 +516,27 @@
.result = ACCEPT,
.retval = 0xabcdef12,
},
{
"map access: value_ptr += N, value_ptr -= N known scalar",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 6),
BPF_MOV32_IMM(BPF_REG_1, 0x12345678),
BPF_STX_MEM(BPF_W, BPF_REG_0, BPF_REG_1, 0),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 2),
BPF_MOV64_IMM(BPF_REG_1, 2),
BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_array_48b = { 3 },
.result = ACCEPT,
.retval = 0x12345678,
},
{
"map access: unknown scalar += value_ptr, 1",
.insns = {