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authorMasami Hiramatsu <mhiramat@kernel.org>2018-01-13 02:54:04 +0900
committerAlexei Starovoitov <ast@kernel.org>2018-01-12 17:33:37 -0800
commitb4da3340eae2c3932144be3e81ccfd4e424d87b7 (patch)
tree0a8d2bfcd4dc6a32524dc2b83d2c9169f9bf124a /arch/Kconfig
parentbpf: simplify xdp_convert_ctx_access for xdp_rxq_info (diff)
downloadlinux-dev-b4da3340eae2c3932144be3e81ccfd4e424d87b7.tar.xz
linux-dev-b4da3340eae2c3932144be3e81ccfd4e424d87b7.zip
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>
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