From: "Oleinik, Alexander" <alxndr@bu.edu>
To: "stefanha@redhat.com" <stefanha@redhat.com>
Cc: "pbonzini@redhat.com" <pbonzini@redhat.com>,
"bsd@redhat.com" <bsd@redhat.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
"rth@twiddle.net" <rth@twiddle.net>
Subject: Re: [Qemu-devel] [PATCH v3 17/22] fuzz: add support for fork-based fuzzing.
Date: Thu, 19 Sep 2019 14:01:53 +0000 [thread overview]
Message-ID: <e90af06e25d1a98300002c5f6326307e4fd242d9.camel@bu.edu> (raw)
In-Reply-To: <20190919125416.GR3606@stefanha-x1.localdomain>
On Thu, 2019-09-19 at 13:54 +0100, Stefan Hajnoczi wrote:
> On Wed, Sep 18, 2019 at 11:19:44PM +0000, Oleinik, Alexander wrote:
> > diff --git a/exec.c b/exec.c
> > index 235d6bc883..d3838f4ea4 100644
> > --- a/exec.c
> > +++ b/exec.c
> > @@ -2295,7 +2295,9 @@ static void ram_block_add(RAMBlock
> > *new_block, Error **errp, bool shared)
> > qemu_ram_setup_dump(new_block->host, new_block-
> > >max_length);
> > qemu_madvise(new_block->host, new_block->max_length,
> > QEMU_MADV_HUGEPAGE);
> > /* MADV_DONTFORK is also needed by KVM in absence of
> > synchronous MMU */
> > +#ifndef CONFIG_FUZZ /* This conflicts with fork-based fuzzing */
> > qemu_madvise(new_block->host, new_block->max_length,
> > QEMU_MADV_DONTFORK);
> > +#endif
> > ram_block_notify_add(new_block->host, new_block-
> > >max_length);
> > }
> > }
>
> I didn't check Makefile changes but regular softmmu binaries should
> continue to work with --enable-fuzzing so we cannot use #ifdef here.
> Perhaps this should be a runtime check similar to qtest_enabled()
Yes - I'll add a runtime check. The makefile requires a make clean
between softmmu and fuzzer builds, since the ".o"s for the fuzzer build
are compiled with fsanitize=fuzzer(must be linked against libfuzzer).
I can see that the #ifndef CONFIG_FUZZ is a proper softmmu builds with
--enable-fuzzer are currently broken due to the ifndef CONFIG_FUZZ
check.
next prev parent reply other threads:[~2019-09-19 14:17 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-18 23:19 [Qemu-devel] [PATCH v3 00/22] Add virtual device fuzzing support Oleinik, Alexander
2019-09-18 23:19 ` [Qemu-devel] [PATCH v3 01/22] softmmu: split off vl.c:main() into main.c Oleinik, Alexander
2019-09-19 10:03 ` Stefan Hajnoczi
2019-09-19 13:01 ` Oleinik, Alexander
2019-09-18 23:19 ` [Qemu-devel] [PATCH v3 02/22] libqos: Rename i2c_send and i2c_recv Oleinik, Alexander
2019-09-19 6:01 ` Thomas Huth
2019-09-19 10:05 ` Stefan Hajnoczi
2019-09-19 11:15 ` Paolo Bonzini
2019-09-19 13:23 ` Oleinik, Alexander
2019-09-18 23:19 ` [Qemu-devel] [PATCH v3 03/22] fuzz: Add FUZZ_TARGET module type Oleinik, Alexander
2019-09-19 10:06 ` Stefan Hajnoczi
2019-09-18 23:19 ` [Qemu-devel] [PATCH v3 04/22] qtest: add qtest_server_send abstraction Oleinik, Alexander
2019-09-19 10:10 ` Stefan Hajnoczi
2019-09-18 23:19 ` [Qemu-devel] [PATCH v3 05/22] libqtest: Add a layer of abstraciton to send/recv Oleinik, Alexander
2019-09-19 10:24 ` Stefan Hajnoczi
2019-09-19 11:18 ` Paolo Bonzini
2019-09-19 13:27 ` Oleinik, Alexander
2019-09-19 14:27 ` Paolo Bonzini
2019-09-18 23:19 ` [Qemu-devel] [PATCH v3 06/22] fuzz: add configure flag --enable-fuzzing Oleinik, Alexander
2019-09-19 10:28 ` Stefan Hajnoczi
2019-09-19 13:07 ` Oleinik, Alexander
2019-09-18 23:19 ` [Qemu-devel] [PATCH v3 07/22] fuzz: Add target/fuzz makefile rules Oleinik, Alexander
2019-09-18 23:19 ` [Qemu-devel] [PATCH v3 08/22] module: check module wasn't already initialized Oleinik, Alexander
2019-09-19 10:30 ` Stefan Hajnoczi
2019-09-18 23:19 ` [Qemu-devel] [PATCH v3 09/22] qtest: add in-process incoming command handler Oleinik, Alexander
2019-09-19 10:31 ` Stefan Hajnoczi
2019-09-18 23:19 ` [Qemu-devel] [PATCH v3 10/22] tests: provide test variables to other targets Oleinik, Alexander
2019-09-18 23:19 ` [Qemu-devel] [PATCH v3 11/22] libqos: split qos-test and libqos makefile vars Oleinik, Alexander
2019-09-26 12:04 ` Thomas Huth
2019-09-18 23:19 ` [Qemu-devel] [PATCH v3 12/22] libqos: move useful qos-test funcs to qos_external Oleinik, Alexander
2019-09-19 10:34 ` Stefan Hajnoczi
2019-09-18 23:19 ` [Qemu-devel] [PATCH v3 13/22] libqtest: make qtest_bufwrite send "atomic" Oleinik, Alexander
2019-09-19 10:37 ` Stefan Hajnoczi
2019-09-19 18:56 ` John Snow
2019-09-19 19:36 ` Oleinik, Alexander
2019-09-20 0:49 ` John Snow
2019-09-19 19:50 ` Alexander Oleinik
2019-09-18 23:19 ` [Qemu-devel] [PATCH v3 14/22] libqtest: add in-process qtest.c tx/rx handlers Oleinik, Alexander
2019-09-19 10:42 ` Stefan Hajnoczi
2019-09-19 13:22 ` Oleinik, Alexander
2019-09-18 23:19 ` [Qemu-devel] [PATCH v3 15/22] fuzz: Add target/fuzz makefile rules Oleinik, Alexander
2019-09-18 23:19 ` [Qemu-devel] [PATCH v3 16/22] fuzz: add fuzzer skeleton Oleinik, Alexander
2019-09-19 12:48 ` Stefan Hajnoczi
2019-09-19 13:49 ` Oleinik, Alexander
2019-09-20 9:30 ` Stefan Hajnoczi
2019-09-23 14:55 ` Darren Kenny
2019-09-18 23:19 ` [Qemu-devel] [PATCH v3 17/22] fuzz: add support for fork-based fuzzing Oleinik, Alexander
2019-09-19 12:54 ` Stefan Hajnoczi
2019-09-19 14:01 ` Oleinik, Alexander [this message]
2019-09-20 9:33 ` Stefan Hajnoczi
2019-09-30 15:17 ` Alexander Oleinik
2019-09-18 23:19 ` [Qemu-devel] [PATCH v3 18/22] fuzz: expose fuzz target name Oleinik, Alexander
2019-09-24 7:49 ` Darren Kenny
2019-09-18 23:19 ` [Qemu-devel] [PATCH v3 19/22] fuzz: add support for qos-assisted fuzz targets Oleinik, Alexander
2019-09-18 23:19 ` [Qemu-devel] [PATCH v3 20/22] fuzz: add i440fx " Oleinik, Alexander
2019-09-19 13:08 ` Stefan Hajnoczi
2019-09-18 23:19 ` [Qemu-devel] [PATCH v3 21/22] fuzz: add virtio-net fuzz target Oleinik, Alexander
2019-09-18 23:19 ` [Qemu-devel] [PATCH v3 22/22] fuzz: add documentation to docs/devel/ Oleinik, Alexander
2019-09-23 14:54 ` Darren Kenny
2019-09-19 10:33 ` [Qemu-devel] [PATCH v3 00/22] Add virtual device fuzzing support Stefan Hajnoczi
2019-09-19 13:10 ` Stefan Hajnoczi
2019-09-20 0:19 ` no-reply
2019-09-20 0:19 ` no-reply
2019-09-20 0:21 ` no-reply
2019-09-20 0:24 ` no-reply
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