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(parent: 8f696cf) | 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)
commitb4de62fe063cd42a6020a71c32f24fa1eedbac4a
treef7f40317bb1474a382035fb58a120e73c82fec46tree | snapshot
parent8f696cf9aaa4f9f3aee05138d01b9f08b3fc3748commit | diff
bpf/verifier: disallow pointer subtraction

Subtraction of pointers was accidentally allowed for unpriv programs
by commit b201d4e1762b. Revert that part of commit.

Fixes: b201d4e1762b ("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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