diff options
| author | Hao Luo <haoluo@google.com> | 2022-04-29 02:57:46 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-05-01 18:22:24 +0300 |
| commit | b453361384c2db1c703dacb806d5fd36aec4ceca (patch) | |
| tree | 5bc0e18260fa913ac73d1eebf43f713748b236a1 /include/linux | |
| parent | 8d38cde47a7e17b646401fa92d916503caa5375e (diff) | |
| download | linux-b453361384c2db1c703dacb806d5fd36aec4ceca.tar.xz | |
bpf: Introduce MEM_RDONLY flag
commit 20b2aff4bc15bda809f994761d5719827d66c0b4 upstream.
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
Cc: stable@vger.kernel.org # 5.15.x
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/bpf.h | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 7249f5e2480e..83c28c683b6d 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -307,7 +307,10 @@ enum bpf_type_flag { /* PTR may be NULL. */ PTR_MAYBE_NULL = BIT(0 + BPF_BASE_TYPE_BITS), - __BPF_TYPE_LAST_FLAG = PTR_MAYBE_NULL, + /* MEM is read-only. */ + MEM_RDONLY = BIT(1 + BPF_BASE_TYPE_BITS), + + __BPF_TYPE_LAST_FLAG = MEM_RDONLY, }; /* Max number of base types. */ @@ -488,8 +491,7 @@ enum bpf_reg_type { * an explicit null check is required for this struct. */ PTR_TO_MEM, /* reg points to valid memory region */ - PTR_TO_RDONLY_BUF, /* reg points to a readonly buffer */ - PTR_TO_RDWR_BUF, /* reg points to a read/write buffer */ + PTR_TO_BUF, /* reg points to a read/write buffer */ PTR_TO_PERCPU_BTF_ID, /* reg points to a percpu kernel variable */ PTR_TO_FUNC, /* reg points to a bpf program function */ __BPF_REG_TYPE_MAX, |