linux-kernel - [PATCH v13 bpf-next 0/1] fprobe: Introduce fprobe function entry/exit probe

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Date:   Wed, 23 Mar 2022 11:34:46 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        "Naveen N . Rao" <naveen.n.rao@...ux.ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        "David S . Miller" <davem@...emloft.net>
Subject: [PATCH v13 bpf-next 0/1] fprobe: Introduce fprobe function entry/exit probe 

Hi,

Here is the 13th version of rethook x86 port. This is developed for a part
of fprobe series [1] for hooking function return. But since I forgot to send
it to arch maintainers, that caused conflict with IBT and SLS mitigation series.
Now I picked the x86 rethook part and send it to x86 maintainers to be
reviewed.

[1] https://lore.kernel.org/all/164735281449.1084943.12438881786173547153.stgit@devnote2/T/#u

Note that this patch is still for the bpf-next since the rethook itself
is on the bpf-next tree. But since this also uses the ANNOTATE_NOENDBR
macro which has been introduced by IBT/ENDBR patch, to build this series
you need to merge the tip/master branch with the bpf-next.
(hopefully, it is rebased soon)

The fprobe itself is for providing the function entry/exit probe
with multiple probe point. The rethook is a sub-feature to hook the
function return as same as kretprobe does. Eventually, I would like
to replace the kretprobe's trampoline with this rethook.

Thank you,

---

Masami Hiramatsu (1):
      rethook: x86: Add rethook x86 implementation

 arch/x86/Kconfig                 |    1 
 arch/x86/include/asm/unwind.h    |    8 ++-
 arch/x86/kernel/Makefile         |    1 
 arch/x86/kernel/kprobes/common.h |    1 
 arch/x86/kernel/rethook.c        |  121 ++++++++++++++++++++++++++++++++++++++
 5 files changed, 131 insertions(+), 1 deletion(-)
 create mode 100644 arch/x86/kernel/rethook.c

--
Masami Hiramatsu (Linaro) <mhiramat@...nel.org>