diff mbox series

[RFC,bpf-next,v4,1/6] bpf: Allow PTR_TO_BTF_ID even for pointers to int.

Message ID 20240202220516.1165466-2-thinker.li@gmail.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series Support PTR_MAYBE_NULL for struct_ops arguments. | expand

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Commit Message

Kui-Feng Lee Feb. 2, 2024, 10:05 p.m. UTC 
From: Kui-Feng Lee <thinker.li@gmail.com>

Pointers to int are always accepted when checking accesses of a context in
btf_ctx_access(). However, we are going to support pointers to scalar types
with PTR_TO_BTF_ID.  Changing the order of checking prog->aux->ctx_arg_info
and checking is_int_ptr() enables the extension in the following patches.

Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
---
 kernel/bpf/btf.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index ef380e546952..0847035bba99 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -6252,9 +6252,6 @@  bool btf_ctx_access(int off, int size, enum bpf_access_type type,
 		 */
 		return true;
 
-	if (is_int_ptr(btf, t))
-		return true;
-
 	/* this is a pointer to another type */
 	for (i = 0; i < prog->aux->ctx_arg_info_size; i++) {
 		const struct bpf_ctx_arg_aux *ctx_arg_info = &prog->aux->ctx_arg_info[i];
@@ -6272,6 +6269,9 @@  bool btf_ctx_access(int off, int size, enum bpf_access_type type,
 		}
 	}
 
+	if (is_int_ptr(btf, t))
+		return true;
+
 	info->reg_type = PTR_TO_BTF_ID;
 	if (prog_args_trusted(prog))
 		info->reg_type |= PTR_TRUSTED;