[PATCH bpf 0/3] bpf: Make BPF trampoline friendly to ftrace · Alexei Starovoitov <ast@kernel.org> · 2019-12-09
[PATCH bpf 1/3] ftrace: Fix function_graph tracer interaction with BPF trampoline · Alexei Starovoitov <ast@kernel.org> · 2019-12-09
Re: [PATCH bpf 1/3] ftrace: Fix function_graph tracer interaction with BPF trampoline · Alexei Starovoitov <hidden> · 2019-12-10
Re: [PATCH bpf 1/3] ftrace: Fix function_graph tracer interaction with BPF trampoline · Steven Rostedt <rostedt@goodmis.org> · 2019-12-10
Re: [PATCH bpf 1/3] ftrace: Fix function_graph tracer interaction with BPF trampoline · Steven Rostedt <rostedt@goodmis.org> · 2019-12-10
Re: [PATCH bpf 1/3] ftrace: Fix function_graph tracer interaction with BPF trampoline · Alexei Starovoitov <hidden> · 2019-12-10
[PATCH bpf 2/3] bpf: Make BPF trampoline use register_ftrace_direct() API · Alexei Starovoitov <ast@kernel.org> · 2019-12-09
[PATCH bpf 3/3] selftests/bpf: test function_graph tracer and bpf trampoline together · Alexei Starovoitov <ast@kernel.org> · 2019-12-09
Re: [PATCH bpf 0/3] bpf: Make BPF trampoline friendly to ftrace · Martin Lau <hidden> · 2019-12-09

Re: [PATCH bpf 1/3] ftrace: Fix function_graph tracer interaction with BPF trampoline

From: Alexei Starovoitov <hidden>
Date: 2019-12-10 16:19:56
Also in: bpf

On Sun, Dec 8, 2019 at 4:03 PM Alexei Starovoitov [off-list ref] wrote:

Depending on type of BPF programs served by BPF trampoline it can call original
function. In such case the trampoline will skip one stack frame while
returning. That will confuse function_graph tracer and will cause crashes with
bad RIP. Teach graph tracer to skip functions that have BPF trampoline attached.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>

Steven, please take a look.

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