bpf: Protect probed address based on kptr_restrict setting

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The probed address can be accessed by userspace through querying the task
file descriptor (fd). However, it is crucial to adhere to the kptr_restrict
setting and refrain from exposing the address if it is not permitted.

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20230709025630.3735-5-laoar.shao@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Yafang Shao 2023-07-09 02:56:24 +00:00 • committed by Alexei Starovoitov

parent edd7f49bb8

commit f1a414537e

1 changed files with 4 additions and 1 deletions

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kernel/trace/trace_kprobe.c

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