bpf: Add a ARG_PTR_TO_CONST_STR argument type

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This type provides the guarantee that an argument is going to be a const
pointer to somewhere in a read-only map value. It also checks that this
pointer is followed by a zero character before the end of the map value.

Signed-off-by: Florent Revest <revest@chromium.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210419155243.1632274-3-revest@chromium.org

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Florent Revest 2021-04-19 17:52:39 +02:00 • committed by Alexei Starovoitov

parent d9c9e4db18

commit fff13c4bb6

2 changed files with 42 additions and 0 deletions

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1

include/linux/bpf.h

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41

kernel/bpf/verifier.c

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