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(parent: 81e94a6) | patch
bpf/verifier: disallow pointer subtraction
authorAlexei Starovoitov <ast@kernel.org>
Wed, 12 Sep 2018 21:06:10 +0000 (14:06 -0700)
committerDaniel Borkmann <daniel@iogearbox.net>
Wed, 12 Sep 2018 21:30:02 +0000 (23:30 +0200)
commite02bdbad29cb30d0920bc0e486d88eee275d2d6f
treef7f40317bb1474a382035fb58a120e73c82fec46tree | snapshot
parent81e94a6433a17b8cc2a1ff627da28f9c35cf161ecommit | diff
bpf/verifier: disallow pointer subtraction

Subtraction of pointers was accidentally allowed for unpriv programs
by commit 7b36b7d56490. Revert that part of commit.

Fixes: 7b36b7d56490 ("bpf: do not allow root to mangle valid pointers")
Reported-by: Jann Horn <jannh@google.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
kernel/bpf/verifier.c diff | blob | history
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