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Re: [PATCH] fuzz: avoid double-fetches by default
From: |
Darren Kenny |
Subject: |
Re: [PATCH] fuzz: avoid double-fetches by default |
Date: |
Thu, 03 Dec 2020 14:27:08 +0000 |
On Wednesday, 2020-12-02 at 11:42:14 -05, Alexander Bulekov wrote:
> The generic fuzzer can find double-fetch bugs. However:
> * We currently have no good way of producing qemu-system reproducers for
> double-fetch bugs. Even if we can get developers to run the binary-blob
> reproducers with the qemu-fuzz builds, we currently don't have a minimizer
> for
> these reproducers, so they are usually not easy to follow.
> * Often times the fuzzer will provide a reproducer containing a
> double-fetch for a bug that can be reproduced without double-fetching.
>
> Until we find a way to build nice double-fetch reproducers that
> developers are willing to look at, lets tell OSS-Fuzz to avoid
> double-fetches.
>
> Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
> ---
> tests/qtest/fuzz/generic_fuzz.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/tests/qtest/fuzz/generic_fuzz.c b/tests/qtest/fuzz/generic_fuzz.c
> index 262a963d2e..07ad690683 100644
> --- a/tests/qtest/fuzz/generic_fuzz.c
> +++ b/tests/qtest/fuzz/generic_fuzz.c
> @@ -916,6 +916,7 @@ static GString
> *generic_fuzz_predefined_config_cmdline(FuzzTarget *t)
> g_assert(t->opaque);
>
> config = t->opaque;
> + setenv("QEMU_AVOID_DOUBLE_FETCH", "1", 1);
> setenv("QEMU_FUZZ_ARGS", config->args, 1);
> setenv("QEMU_FUZZ_OBJECTS", config->objects, 1);
> return generic_fuzz_cmdline(t);
> --
> 2.28.0