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[bpf-next,v2,2/4] selftests/bpf: check if verifier tracks constants spilled by BPF_ST_MEM

Message ID 20230214232030.1502829-3-eddyz87@gmail.com (mailing list archive)
State Accepted
Commit 1a24af65bb5fed673a9377e794ee3cf416fec64d
Delegated to: BPF
Headers show
Series Improvements for BPF_ST tracking by verifier | expand

Checks

Context Check Description
netdev/tree_selection success Clearly marked for bpf-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/cc_maintainers warning 9 maintainers not CCed: linux-kselftest@vger.kernel.org john.fastabend@gmail.com sdf@google.com shuah@kernel.org jolsa@kernel.org song@kernel.org mykolal@fb.com haoluo@google.com kpsingh@kernel.org
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
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netdev/checkpatch warning WARNING: Missing or malformed SPDX-License-Identifier tag in line 1 WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
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bpf/vmtest-bpf-next-PR success PR summary

Commit Message

Eduard Zingerman Feb. 14, 2023, 11:20 p.m. UTC
Check that verifier tracks the value of 'imm' spilled to stack by
BPF_ST_MEM instruction. Cover the following cases:
- write of non-zero constant to stack;
- write of a zero constant to stack.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
---
 .../selftests/bpf/verifier/bpf_st_mem.c       | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/verifier/bpf_st_mem.c
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/verifier/bpf_st_mem.c b/tools/testing/selftests/bpf/verifier/bpf_st_mem.c
new file mode 100644
index 000000000000..932903f9e585
--- /dev/null
+++ b/tools/testing/selftests/bpf/verifier/bpf_st_mem.c
@@ -0,0 +1,37 @@ 
+{
+	"BPF_ST_MEM stack imm non-zero",
+	.insns = {
+	BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 42),
+	BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, -42),
+	/* if value is tracked correctly R0 is zero */
+	BPF_EXIT_INSN(),
+	},
+	.result = ACCEPT,
+	/* Use prog type that requires return value in range [0, 1] */
+	.prog_type = BPF_PROG_TYPE_SK_LOOKUP,
+	.expected_attach_type = BPF_SK_LOOKUP,
+	.runs = -1,
+},
+{
+	"BPF_ST_MEM stack imm zero",
+	.insns = {
+	/* mark stack 0000 0000 */
+	BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
+	/* read and sum a few bytes */
+	BPF_MOV64_IMM(BPF_REG_0, 0),
+	BPF_LDX_MEM(BPF_B, BPF_REG_1, BPF_REG_10, -8),
+	BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
+	BPF_LDX_MEM(BPF_B, BPF_REG_1, BPF_REG_10, -4),
+	BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
+	BPF_LDX_MEM(BPF_B, BPF_REG_1, BPF_REG_10, -1),
+	BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
+	/* if value is tracked correctly R0 is zero */
+	BPF_EXIT_INSN(),
+	},
+	.result = ACCEPT,
+	/* Use prog type that requires return value in range [0, 1] */
+	.prog_type = BPF_PROG_TYPE_SK_LOOKUP,
+	.expected_attach_type = BPF_SK_LOOKUP,
+	.runs = -1,
+},