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bpf: Introduce MEM_RDONLY flag

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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>
This commit is contained in:
Hao Luo
2022-04-28 16:57:46 -07:00
committed by Greg Kroah-Hartman
parent 8d38cde47a
commit b453361384
6 changed files with 60 additions and 43 deletions
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8
include/linux/bpf.h
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@@ -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,