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authorJosef Bacik <jbacik@fb.com>2017-12-11 11:36:48 -0500
committerAlexei Starovoitov <ast@kernel.org>2017-12-12 09:02:34 -0800
commit9802d86585db91655c7d1929a4f6bbe0952ea88e (patch)
tree53b334864518dd27b243eafc9ab510ac56ee3b74 /arch/Kconfig
parentbtrfs: make open_ctree error injectable (diff)
downloadlinux-dev-9802d86585db91655c7d1929a4f6bbe0952ea88e.tar.xz
linux-dev-9802d86585db91655c7d1929a4f6bbe0952ea88e.zip
bpf: add a bpf_override_function helper
Error injection is sloppy and very ad-hoc. BPF could fill this niche perfectly with it's kprobe functionality. We could make sure errors are only triggered in specific call chains that we care about with very specific situations. Accomplish this with the bpf_override_funciton helper. This will modify the probe'd callers return value to the specified value and set the PC to an override function that simply returns, bypassing the originally probed function. This gives us a nice clean way to implement systematic error injection for all of our code paths. Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to '')
-rw-r--r--arch/Kconfig3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/Kconfig b/arch/Kconfig
index 400b9e1b2f27..d3f4aaf9cb7a 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -196,6 +196,9 @@ config HAVE_OPTPROBES
config HAVE_KPROBES_ON_FTRACE
bool
+config HAVE_KPROBE_OVERRIDE
+ bool
+
config HAVE_NMI
bool