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

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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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8

include/linux/bpf.h

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3

kernel/bpf/btf.c

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4

kernel/bpf/map_iter.c

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84

kernel/bpf/verifier.c

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2

net/core/bpf_sk_storage.c

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2

net/core/sock_map.c

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