diff mbox series

[bpf-next,v2,1/2] bpf: Check cfi_stubs before registering a struct_ops type.

Message ID 20240216020350.2061373-2-thinker.li@gmail.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series Check cfi_stubs before registering a struct_ops type. | expand

Checks

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bpf/vmtest-bpf-next-PR fail PR summary
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1051 this patch: 1051
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers warning 9 maintainers not CCed: jolsa@kernel.org daniel@iogearbox.net john.fastabend@gmail.com yonghong.song@linux.dev netdev@vger.kernel.org sdf@google.com eddyz87@gmail.com kpsingh@kernel.org haoluo@google.com
netdev/build_clang success Errors and warnings before: 1066 this patch: 1066
netdev/verify_signedoff success Signed-off-by tag matches author and committer
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netdev/verify_fixes success No Fixes tag
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netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 32 lines checked
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netdev/source_inline success Was 0 now: 0
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Commit Message

Kui-Feng Lee Feb. 16, 2024, 2:03 a.m. UTC 
From: Kui-Feng Lee <thinker.li@gmail.com>

Recently, cfi_stubs were introduced. However, existing struct_ops types
that are not in the upstream may not be aware of this, resulting in kernel
crashes. By rejecting struct_ops types that do not provide cfi_stubs during
registration, these crashes can be avoided.

Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
---
 kernel/bpf/bpf_struct_ops.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
diff mbox series

Patch

diff --git a/kernel/bpf/bpf_struct_ops.c b/kernel/bpf/bpf_struct_ops.c
index 0d7be97a2411..9febd450d224 100644
--- a/kernel/bpf/bpf_struct_ops.c
+++ b/kernel/bpf/bpf_struct_ops.c
@@ -302,6 +302,11 @@  int bpf_struct_ops_desc_init(struct bpf_struct_ops_desc *st_ops_desc,
 	}
 	sprintf(value_name, "%s%s", VALUE_PREFIX, st_ops->name);
 
+	if (!st_ops->cfi_stubs) {
+		pr_warn("struct %s has no cfi_stubs\n", st_ops->name);
+		return -EINVAL;
+	}
+
 	type_id = btf_find_by_name_kind(btf, st_ops->name,
 					BTF_KIND_STRUCT);
 	if (type_id < 0) {
@@ -339,6 +344,7 @@  int bpf_struct_ops_desc_init(struct bpf_struct_ops_desc *st_ops_desc,
 
 	for_each_member(i, t, member) {
 		const struct btf_type *func_proto;
+		u32 moff;
 
 		mname = btf_name_by_offset(btf, member->name_off);
 		if (!*mname) {
@@ -361,6 +367,14 @@  int bpf_struct_ops_desc_init(struct bpf_struct_ops_desc *st_ops_desc,
 		if (!func_proto)
 			continue;
 
+		moff = __btf_member_bit_offset(t, member) / 8;
+		if (!*(void **)(st_ops->cfi_stubs + moff)) {
+			pr_warn("member %s in struct %s has no cfi stub function\n",
+				mname, st_ops->name);
+			err = -EINVAL;
+			goto errout;
+		}
+
 		if (btf_distill_func_proto(log, btf,
 					   func_proto, mname,
 					   &st_ops->func_models[i])) {