diff options
| author | Hao Luo <haoluo@google.com> | 2021-12-17 03:31:48 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2021-12-19 00:27:41 +0300 |
| commit | 20b2aff4bc15bda809f994761d5719827d66c0b4 (patch) | |
| tree | 56ef53fccf3a9be91909c3dc2cd36068043acc68 /kernel/bpf/btf.c | |
| parent | c25b2ae136039ffa820c26138ed4a5e5f3ab3841 (diff) | |
| download | linux-20b2aff4bc15bda809f994761d5719827d66c0b4.tar.xz | |
bpf: Introduce MEM_RDONLY flag
This patch introduce a flag MEM_RDONLY to tag a reg value
pointing to read-only memory. It makes the following changes:
1. PTR_TO_RDWR_BUF -> PTR_TO_BUF
2. PTR_TO_RDONLY_BUF -> PTR_TO_BUF | MEM_RDONLY
Signed-off-by: Hao Luo <haoluo@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20211217003152.48334-6-haoluo@google.com
Diffstat (limited to 'kernel/bpf/btf.c')
| -rw-r--r-- | kernel/bpf/btf.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 4e2ca7bea6c4..d1447b075c73 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -4944,8 +4944,7 @@ bool btf_ctx_access(int off, int size, enum bpf_access_type type, type = base_type(ctx_arg_info->reg_type); flag = type_flag(ctx_arg_info->reg_type); - if (ctx_arg_info->offset == off && - (type == PTR_TO_RDWR_BUF || type == PTR_TO_RDONLY_BUF) && + if (ctx_arg_info->offset == off && type == PTR_TO_BUF && (flag & PTR_MAYBE_NULL)) { info->reg_type = ctx_arg_info->reg_type; return true; |