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| author |   Aleksandr Nogikh <nogikh@google.com> | 2020-10-29 17:36:19 +0000 |
|---|---|---|
| committer |   Jakub Kicinski <kuba@kernel.org> | 2020-11-02 18:01:34 -0800 |
| commit | 6370cc3bbd8a0f9bf975b013781243ab147876c6 (patch) | |
| tree | 1d800ae66d7a5b639dd86a99532436150af97528 /lib | |
| parent | kernel: make kcov_common_handle consider the current context (diff) | |
| download | linux-dev-6370cc3bbd8a0f9bf975b013781243ab147876c6.tar.xz linux-dev-6370cc3bbd8a0f9bf975b013781243ab147876c6.zip | |
net: add kcov handle to skb extensions
Remote KCOV coverage collection enables coverage-guided fuzzing of the
code that is not reachable during normal system call execution. It is
especially helpful for fuzzing networking subsystems, where it is
common to perform packet handling in separate work queues even for the
packets that originated directly from the user space.
Enable coverage-guided frame injection by adding kcov remote handle to
skb extensions. Default initialization in __alloc_skb and
__build_skb_around ensures that no socket buffer that was generated
during a system call will be missed.
Code that is of interest and that performs packet processing should be
annotated with kcov_remote_start()/kcov_remote_stop().
An alternative approach is to determine kcov_handle solely on the
basis of the device/interface that received the specific socket
buffer. However, in this case it would be impossible to distinguish
between packets that originated during normal background network
processes or were intentionally injected from the user space.
Signed-off-by: Aleksandr Nogikh <nogikh@google.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.debug | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index d7a7bc3b6098..d171a032db78 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1870,6 +1870,7 @@ config KCOV depends on CC_HAS_SANCOV_TRACE_PC || GCC_PLUGINS select DEBUG_FS select GCC_PLUGIN_SANCOV if !CC_HAS_SANCOV_TRACE_PC + select SKB_EXTENSIONS help KCOV exposes kernel code coverage information in a form suitable for coverage-guided fuzzing (randomized testing). |