diff mbox series

[bpf-next,2/2] selftests/bpf: check null propagation only neither reg is PTR_TO_BTF_ID

Message ID 20221212041547.12775-1-sunhao.th@gmail.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series [bpf-next,1/2] bpf: fix nullness propagation for reg to reg comparisons | expand

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bpf/vmtest-bpf-next-PR success PR summary
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 Single patches do not need cover letters
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 4 maintainers not CCed: eddyz87@gmail.com linux-kselftest@vger.kernel.org shuah@kernel.org mykolal@fb.com
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 success total: 0 errors, 0 warnings, 0 checks, 25 lines checked
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Commit Message

Hao Sun Dec. 12, 2022, 4:15 a.m. UTC 
Verify that nullness information is not porpagated in the branches
of register to register JEQ and JNE operations if one of them is
PTR_TO_BTF_ID.

Signed-off-by: Hao Sun <sunhao.th@gmail.com>
---
 .../bpf/verifier/jeq_infer_not_null.c         | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)

Comments

Yonghong Song Dec. 12, 2022, 11:22 p.m. UTC | #1 
On 12/11/22 8:15 PM, Hao Sun wrote:
> Verify that nullness information is not porpagated in the branches
> of register to register JEQ and JNE operations if one of them is
> PTR_TO_BTF_ID.
> 
> Signed-off-by: Hao Sun <sunhao.th@gmail.com>

Acked-by: Yonghong Song <yhs@fb.com>
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/verifier/jeq_infer_not_null.c b/tools/testing/selftests/bpf/verifier/jeq_infer_not_null.c
index 67a1c07ead34..b2b215227d97 100644
--- a/tools/testing/selftests/bpf/verifier/jeq_infer_not_null.c
+++ b/tools/testing/selftests/bpf/verifier/jeq_infer_not_null.c
@@ -172,3 +172,25 @@ 
 	.prog_type = BPF_PROG_TYPE_XDP,
 	.result = ACCEPT,
 },
+{
+	"jne/jeq infer not null, PTR_TO_MAP_OR_NULL unchanged with PTR_TO_BTF_ID reg",
+	.insns = {
+	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),
+	BPF_LD_MAP_FD(BPF_REG_1, 0),
+	/* r6 = bpf_map->inner_map_meta; */
+	BPF_LDX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, 8),
+	/* r0 = map_lookup_elem(r1, r2); */
+	BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
+	/* if (r0 == r6) read *r0; */
+	BPF_JMP_REG(BPF_JEQ, BPF_REG_6, BPF_REG_0, 1),
+	BPF_EXIT_INSN(),
+	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_0, 0),
+	BPF_EXIT_INSN(),
+	},
+	.fixup_map_hash_8b = { 3 },
+	.prog_type = BPF_PROG_TYPE_XDP,
+	.result = REJECT,
+	.errstr = "R0 invalid mem access 'map_value_or_null'",
+},