diff mbox series

[bpf-next,05/29] bpf: Add bpf_check_attach_model function

Message ID 20211118112455.475349-6-jolsa@kernel.org (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series bpf: Add batch support for attaching trampolines | expand

Checks

Context Check Description
bpf/vmtest-bpf-next-PR fail PR summary
bpf/vmtest-bpf-next fail VM_Test
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 fail Series longer than 15 patches (and no cover letter)
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 41 this patch: 41
netdev/cc_maintainers warning 1 maintainers not CCed: kpsingh@kernel.org
netdev/build_clang success Errors and warnings before: 22 this patch: 22
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 45 this patch: 45
netdev/checkpatch warning WARNING: From:/Signed-off-by: email address mismatch: 'From: Jiri Olsa <jolsa@redhat.com>' != 'Signed-off-by: Jiri Olsa <jolsa@kernel.org>' WARNING: line length of 95 exceeds 80 columns
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Jiri Olsa Nov. 18, 2021, 11:24 a.m. UTC 
Adding bpf_check_attach_model function that returns
model for function specified by btf_id. It will be
used in following patches.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 include/linux/bpf_verifier.h |  4 ++++
 kernel/bpf/verifier.c        | 29 +++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)
diff mbox series

Patch

diff --git a/include/linux/bpf_verifier.h b/include/linux/bpf_verifier.h
index c8a78e830fca..b561c0b08e68 100644
--- a/include/linux/bpf_verifier.h
+++ b/include/linux/bpf_verifier.h
@@ -527,6 +527,10 @@  int bpf_check_attach_target(struct bpf_verifier_log *log,
 			    const struct bpf_prog *tgt_prog,
 			    u32 btf_id,
 			    struct bpf_attach_target_info *tgt_info);
+int bpf_check_attach_model(const struct bpf_prog *prog,
+			   const struct bpf_prog *tgt_prog,
+			   u32 btf_id,
+			   struct btf_func_model *fmodel);
 void bpf_free_kfunc_btf_tab(struct bpf_kfunc_btf_tab *tab);
 
 
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index cbbbf47e1832..fac0c3518add 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -13749,6 +13749,35 @@  static int __bpf_check_attach_target(struct bpf_verifier_log *log,
 	return 0;
 }
 
+int bpf_check_attach_model(const struct bpf_prog *prog,
+			   const struct bpf_prog *tgt_prog,
+			   u32 btf_id,
+			   struct btf_func_model *fmodel)
+{
+	struct attach_target target = { };
+	int ret;
+
+	ret = __bpf_check_attach_target(NULL, prog, tgt_prog, btf_id, &target);
+	if (ret)
+		return ret;
+
+	switch (prog->expected_attach_type) {
+	case BPF_TRACE_RAW_TP:
+		break;
+	case BPF_TRACE_ITER:
+		ret = btf_distill_func_proto(NULL, target.btf, target.t, target.tname, fmodel);
+		break;
+	default:
+	case BPF_MODIFY_RETURN:
+	case BPF_LSM_MAC:
+	case BPF_TRACE_FENTRY:
+	case BPF_TRACE_FEXIT:
+		ret = btf_distill_func_proto(NULL, target.btf, target.t, target.tname, fmodel);
+	}
+
+	return ret;
+}
+
 int bpf_check_attach_target(struct bpf_verifier_log *log,
 			    const struct bpf_prog *prog,
 			    const struct bpf_prog *tgt_prog,