diff options
| author | Masami Hiramatsu <mhiramat@kernel.org> | 2018-01-13 02:54:04 +0900 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2018-01-12 17:33:37 -0800 |
| commit | b4da3340eae2c3932144be3e81ccfd4e424d87b7 (patch) | |
| tree | 0a8d2bfcd4dc6a32524dc2b83d2c9169f9bf124a /kernel/trace/Kconfig | |
| parent | daaf24c634ab951cad3dcef28492001ef9c931d0 (diff) | |
tracing/kprobe: bpf: Check error injectable event is on function entry
Check whether error injectable event is on function entry or not.
Currently it checks the event is ftrace-based kprobes or not,
but that is wrong. It should check if the event is on the entry
of target function. Since error injection will override a function
to just return with modified return value, that operation must
be done before the target function starts making stackframe.
As a side effect, bpf error injection is no need to depend on
function-tracer. It can work with sw-breakpoint based kprobe
events too.
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel/trace/Kconfig')
| -rw-r--r-- | kernel/trace/Kconfig | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index ae3a2d519e50..6400e1bf97c5 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -533,9 +533,7 @@ config FUNCTION_PROFILER config BPF_KPROBE_OVERRIDE bool "Enable BPF programs to override a kprobed function" depends on BPF_EVENTS - depends on KPROBES_ON_FTRACE depends on HAVE_KPROBE_OVERRIDE - depends on DYNAMIC_FTRACE_WITH_REGS default n help Allows BPF to override the execution of a probed function and |