bpf/syscall: allow key to be null in map functions

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This commit adds the required logic to allow key being NULL
in case the key_size of the map is 0.

A new __bpf_copy_key function helper only copies the key from
userpsace when key_size != 0, otherwise it enforces that key must be
null.

Signed-off-by: Mauricio Vasquez B <mauricio.vasquez@polito.it>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Mauricio Vasquez B 2018-10-18 15:16:14 +02:00 • committed by Alexei Starovoitov

parent 144991602e

commit c9d29f4658

1 changed files with 15 additions and 4 deletions

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kernel/bpf/syscall.c

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