Hao Luo 1cd4928129 UPSTREAM: 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>
(cherry picked from commit b453361384)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ic4fa4f9f5832c9d2b65ea0272367fbbb8007f24c

2022-06-18 18:28:44 +00:00

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