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authorJosef Bacik <jbacik@fb.com>2017-11-07 23:28:42 +0300
committerDavid S. Miller <davem@davemloft.net>2017-11-11 06:18:05 +0300
commitdd0bb688eaa241b5655d396d45366cba9225aed9 (patch)
tree80e320112959e90d474fd20e644b8377217dad0b /include/linux/trace_events.h
parent54985120a1c461b74f9510e5d730971f2a2383b1 (diff)
downloadlinux-dd0bb688eaa241b5655d396d45366cba9225aed9.tar.xz
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 'include/linux/trace_events.h')
-rw-r--r--include/linux/trace_events.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
index 84014ecfa67f..17e5e820a84c 100644
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -523,6 +523,7 @@ do { \
struct perf_event;
DECLARE_PER_CPU(struct pt_regs, perf_trace_regs);
+DECLARE_PER_CPU(int, bpf_kprobe_override);
extern int perf_trace_init(struct perf_event *event);
extern void perf_trace_destroy(struct perf_event *event);