docs/fuzz: remove mentions of fork-based fuzzing
Signed-off-by: Alexander Bulekov <alxndr@bu.edu> Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
This commit is contained in:
parent
d2e6f9272d
commit
7d9e5f18a9
|
@ -19,11 +19,6 @@ responsibility to ensure that state is reset between fuzzing-runs.
|
|||
Building the fuzzers
|
||||
--------------------
|
||||
|
||||
*NOTE*: If possible, build a 32-bit binary. When forking, the 32-bit fuzzer is
|
||||
much faster, since the page-map has a smaller size. This is due to the fact that
|
||||
AddressSanitizer maps ~20TB of memory, as part of its detection. This results
|
||||
in a large page-map, and a much slower ``fork()``.
|
||||
|
||||
To build the fuzzers, install a recent version of clang:
|
||||
Configure with (substitute the clang binaries with the version you installed).
|
||||
Here, enable-sanitizers, is optional but it allows us to reliably detect bugs
|
||||
|
@ -296,10 +291,9 @@ input. It is also responsible for manually calling ``main_loop_wait`` to ensure
|
|||
that bottom halves are executed and any cleanup required before the next input.
|
||||
|
||||
Since the same process is reused for many fuzzing runs, QEMU state needs to
|
||||
be reset at the end of each run. There are currently two implemented
|
||||
options for resetting state:
|
||||
be reset at the end of each run. For example, this can be done by rebooting the
|
||||
VM, after each run.
|
||||
|
||||
- Reboot the guest between runs.
|
||||
- *Pros*: Straightforward and fast for simple fuzz targets.
|
||||
|
||||
- *Cons*: Depending on the device, does not reset all device state. If the
|
||||
|
@ -308,15 +302,3 @@ options for resetting state:
|
|||
reboot.
|
||||
|
||||
- *Example target*: ``i440fx-qtest-reboot-fuzz``
|
||||
|
||||
- Run each test case in a separate forked process and copy the coverage
|
||||
information back to the parent. This is fairly similar to AFL's "deferred"
|
||||
fork-server mode [3]
|
||||
|
||||
- *Pros*: Relatively fast. Devices only need to be initialized once. No need to
|
||||
do slow reboots or vmloads.
|
||||
|
||||
- *Cons*: Not officially supported by libfuzzer. Does not work well for
|
||||
devices that rely on dedicated threads.
|
||||
|
||||
- *Example target*: ``virtio-net-fork-fuzz``
|
||||
|
|
Loading…
Reference in New Issue