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authorJosef Bacik <jbacik@fb.com>2017-11-07 15:28:42 -0500
committerDavid S. Miller <davem@davemloft.net>2017-11-11 12:18:05 +0900
commitdd0bb688eaa241b5655d396d45366cba9225aed9 (patch)
tree80e320112959e90d474fd20e644b8377217dad0b /arch/Kconfig
parentnet: fix incorrect comment with regard to VLAN packet handling (diff)
downloadlinux-dev-dd0bb688eaa241b5655d396d45366cba9225aed9.tar.xz
linux-dev-dd0bb688eaa241b5655d396d45366cba9225aed9.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> Signed-off-by: Josef Bacik <jbacik@fb.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
-rw-r--r--arch/Kconfig3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/Kconfig b/arch/Kconfig
index 057370a0ac4e..6e8520f09bc1 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