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bpf: Update selftests to reflect new error states

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commit d7a5091351756d0ae8e63134313c455624e36a13 upstream.

Update various selftest error messages:

 * The 'Rx tried to sub from different maps, paths, or prohibited types'
   is reworked into more specific/differentiated error messages for better
   guidance.

 * The change into 'value -4294967168 makes map_value pointer be out of
   bounds' is due to moving the mixed bounds check into the speculation
   handling and thus occuring slightly later than above mentioned sanity
   check.

 * The change into 'math between map_value pointer and register with
   unbounded min value' is similarly due to register sanity check coming
   before the mixed bounds check.

 * The case of 'map access: known scalar += value_ptr from different maps'
   now loads fine given masks are the same from the different paths (despite
   max map value size being different).

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
[fllinden@amazon - skip bounds.c test mods, they won't change error msg on 5.4]
Signed-off-by: Frank van der Linden <fllinden@amazon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Daniel Borkmann 2021-04-29 22:08:39 +00:00 committed by Greg Kroah-Hartman
parent ef4e68f0af
commit e23967af13
4 changed files with 14 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
tools/testing/selftests/bpf/verifier/bounds_deduction.c
View File

@ -6,7 +6,7 @@
BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "R0 tried to sub from different maps, paths, or prohibited types",
.errstr_unpriv = "R1 has pointer with unsupported alu operation",
.errstr = "R0 tried to subtract pointer from scalar",
.result = REJECT,
},
@ -21,7 +21,7 @@
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",
.errstr_unpriv = "R1 has pointer with unsupported alu operation",
.result_unpriv = REJECT,
.result = ACCEPT,
.retval = 1,
@ -34,22 +34,23 @@
BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "R0 tried to sub from different maps, paths, or prohibited types",
.errstr_unpriv = "R1 has pointer with unsupported alu operation",
.errstr = "R0 tried to subtract pointer from scalar",
.result = REJECT,
},
{
"check deducing bounds from const, 4",
.insns = {
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_JMP_IMM(BPF_JSLE, BPF_REG_0, 0, 1),
BPF_EXIT_INSN(),
BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 1),
BPF_EXIT_INSN(),
BPF_ALU64_REG(BPF_SUB, BPF_REG_1, BPF_REG_0),
BPF_ALU64_REG(BPF_SUB, BPF_REG_6, BPF_REG_0),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "R1 tried to sub from different maps, paths, or prohibited types",
.errstr_unpriv = "R6 has pointer with unsupported alu operation",
.result_unpriv = REJECT,
.result = ACCEPT,
},
@ -61,7 +62,7 @@
BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "R0 tried to sub from different maps, paths, or prohibited types",
.errstr_unpriv = "R1 has pointer with unsupported alu operation",
.errstr = "R0 tried to subtract pointer from scalar",
.result = REJECT,
},
@ -74,7 +75,7 @@
BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "R0 tried to sub from different maps, paths, or prohibited types",
.errstr_unpriv = "R1 has pointer with unsupported alu operation",
.errstr = "R0 tried to subtract pointer from scalar",
.result = REJECT,
},
@ -88,7 +89,7 @@
offsetof(struct __sk_buff, mark)),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "R1 tried to sub from different maps, paths, or prohibited types",
.errstr_unpriv = "R1 has pointer with unsupported alu operation",
.errstr = "dereference of modified ctx ptr",
.result = REJECT,
.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
@ -103,7 +104,7 @@
offsetof(struct __sk_buff, mark)),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "R1 tried to add from different maps, paths, or prohibited types",
.errstr_unpriv = "R1 has pointer with unsupported alu operation",
.errstr = "dereference of modified ctx ptr",
.result = REJECT,
.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
@ -116,7 +117,7 @@
BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "R0 tried to sub from different maps, paths, or prohibited types",
.errstr_unpriv = "R1 has pointer with unsupported alu operation",
.errstr = "R0 tried to subtract pointer from scalar",
.result = REJECT,
},

13
tools/testing/selftests/bpf/verifier/bounds_mix_sign_unsign.c
View File

@ -19,7 +19,6 @@
},
.fixup_map_hash_8b = { 3 },
.errstr = "unbounded min value",
.errstr_unpriv = "R1 has unknown scalar with mixed signed bounds",
.result = REJECT,
},
{
@ -43,7 +42,6 @@
},
.fixup_map_hash_8b = { 3 },
.errstr = "unbounded min value",
.errstr_unpriv = "R1 has unknown scalar with mixed signed bounds",
.result = REJECT,
},
{
@ -69,7 +67,6 @@
},
.fixup_map_hash_8b = { 3 },
.errstr = "unbounded min value",
.errstr_unpriv = "R8 has unknown scalar with mixed signed bounds",
.result = REJECT,
},
{
@ -94,7 +91,6 @@
},
.fixup_map_hash_8b = { 3 },
.errstr = "unbounded min value",
.errstr_unpriv = "R8 has unknown scalar with mixed signed bounds",
.result = REJECT,
},
{
@ -141,7 +137,6 @@
},
.fixup_map_hash_8b = { 3 },
.errstr = "unbounded min value",
.errstr_unpriv = "R1 has unknown scalar with mixed signed bounds",
.result = REJECT,
},
{
@ -210,7 +205,6 @@
},
.fixup_map_hash_8b = { 3 },
.errstr = "unbounded min value",
.errstr_unpriv = "R1 has unknown scalar with mixed signed bounds",
.result = REJECT,
},
{
@ -260,7 +254,6 @@
},
.fixup_map_hash_8b = { 3 },
.errstr = "unbounded min value",
.errstr_unpriv = "R1 has unknown scalar with mixed signed bounds",
.result = REJECT,
},
{
@ -287,7 +280,6 @@
},
.fixup_map_hash_8b = { 3 },
.errstr = "unbounded min value",
.errstr_unpriv = "R1 has unknown scalar with mixed signed bounds",
.result = REJECT,
},
{
@ -313,7 +305,6 @@
},
.fixup_map_hash_8b = { 3 },
.errstr = "unbounded min value",
.errstr_unpriv = "R1 has unknown scalar with mixed signed bounds",
.result = REJECT,
},
{
@ -342,7 +333,6 @@
},
.fixup_map_hash_8b = { 3 },
.errstr = "unbounded min value",
.errstr_unpriv = "R7 has unknown scalar with mixed signed bounds",
.result = REJECT,
},
{
@ -372,7 +362,6 @@
},
.fixup_map_hash_8b = { 4 },
.errstr = "unbounded min value",
.errstr_unpriv = "R1 has unknown scalar with mixed signed bounds",
.result = REJECT,
},
{
@ -400,7 +389,5 @@
},
.fixup_map_hash_8b = { 3 },
.errstr = "unbounded min value",
.errstr_unpriv = "R1 has unknown scalar with mixed signed bounds",
.result = REJECT,
.result_unpriv = REJECT,
},

2
tools/testing/selftests/bpf/verifier/unpriv.c
View File

@ -503,7 +503,7 @@
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",
.errstr_unpriv = "R1 stack pointer arithmetic goes out of range",
.result_unpriv = REJECT,
.result = ACCEPT,
},

6
tools/testing/selftests/bpf/verifier/value_ptr_arith.c
View File

@ -21,8 +21,6 @@
.fixup_map_hash_16b = { 5 },
.fixup_map_array_48b = { 8 },
.result = ACCEPT,
.result_unpriv = REJECT,
.errstr_unpriv = "R1 tried to add from different maps",
.retval = 1,
},
{
@ -122,7 +120,7 @@
.fixup_map_array_48b = { 1 },
.result = ACCEPT,
.result_unpriv = REJECT,
.errstr_unpriv = "R2 tried to add from different pointers or scalars",
.errstr_unpriv = "R2 tried to add from different maps, paths or scalars",
.retval = 0,
},
{
@ -169,7 +167,7 @@
.fixup_map_array_48b = { 1 },
.result = ACCEPT,
.result_unpriv = REJECT,
.errstr_unpriv = "R2 tried to add from different maps, paths, or prohibited types",
.errstr_unpriv = "R2 tried to add from different maps, paths or scalars",
.retval = 0,
},
{