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| author |  Hao Luo <haoluo@google.com>
| 2021-12-16 16:31:48 -0800 |
|---|---|---|
| committer |  Alexei Starovoitov <ast@kernel.org>
| 2021-12-18 13:27:41 -0800 |
| commit | 20b2aff4bc15bda809f994761d5719827d66c0b4 (patch) | |
| tree | 56ef53fccf3a9be91909c3dc2cd36068043acc68 /include/linux/bpf.h | |
| parent | bpf: Replace PTR_TO_XXX_OR_NULL with PTR_TO_XXX | PTR_MAYBE_NULL (diff) | |
| download | linux-20b2aff4bc15bda809f994761d5719827d66c0b4.tar.gz linux-20b2aff4bc15bda809f994761d5719827d66c0b4.tar.bz2 linux-20b2aff4bc15bda809f994761d5719827d66c0b4.zip | |
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 'include/linux/bpf.h')
| -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 c3de62267b84..126048110bdb 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -311,7 +311,10 @@ 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. */ @@ -492,8 +495,7 @@ 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, |