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bpf: Introduce MEM_RDONLY flag

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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
This commit is contained in:
Hao Luo
2021-12-16 16:31:48 -08:00
committed by Alexei Starovoitov
parent c25b2ae136
commit 20b2aff4bc
6 changed files with 60 additions and 43 deletions
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2
net/core/sock_map.c
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@@ -1564,7 +1564,7 @@ static struct bpf_iter_reg sock_map_iter_reg = {
.ctx_arg_info_size = 2,
.ctx_arg_info = {
{ offsetof(struct bpf_iter__sockmap, key),
PTR_TO_RDONLY_BUF | PTR_MAYBE_NULL },
PTR_TO_BUF | PTR_MAYBE_NULL | MEM_RDONLY },
{ offsetof(struct bpf_iter__sockmap, sk),
PTR_TO_BTF_ID_OR_NULL },
},