bpf: Add sanity check for upper ptr_limit

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commit 1b1597e64e upstream.

Given we know the max possible value of ptr_limit at the time of retrieving
the latter, add basic assertions, so that the verifier can bail out if
anything looks odd and reject the program. Nothing triggered this so far,
but it also does not hurt to have these.

Signed-off-by: Piotr Krysiuk <piotras@gmail.com>
Co-developed-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Piotr Krysiuk 2021-03-16 09:47:02 +01:00 • committed by Greg Kroah-Hartman

parent 6a3504bf40

commit 1010f17aaa

1 changed files with 8 additions and 3 deletions

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kernel/bpf/verifier.c

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