bpf: don't prune branches when a scalar is replaced with a pointer

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From: Jann Horn <jannh@google.com>

[ Upstream commit 179d1c5602 ]

This could be made safe by passing through a reference to env and checking
for env->allow_ptr_leaks, but it would only work one way and is probably
not worth the hassle - not doing it will not directly lead to program
rejection.

Fixes: f1174f77b5 ("bpf/verifier: rework value tracking")
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Daniel Borkmann 2017-12-22 16:23:10 +01:00 • committed by Greg Kroah-Hartman

parent c90268f7cb

commit cb56cc1b29

1 changed files with 7 additions and 8 deletions

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kernel/bpf/verifier.c

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