linux-kernel - [PATCH v2 0/4] Make fprobe + rethook immune to recursion

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Message-Id: <20230516071830.8190-1-zegao@tencent.com>
Date:   Tue, 16 May 2023 15:18:26 +0800
From:   Ze Gao <zegao2021@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Albert Ou <aou@...s.berkeley.edu>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vasily Gorbik <gor@...ux.ibm.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        bpf@...r.kernel.org, Conor Dooley <conor@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>, Yonghong Song <yhs@...com>,
        Ze Gao <zegao@...cent.com>
Subject: [PATCH v2 0/4] Make fprobe + rethook immune to recursion

Hi all,

This is the 2nd version of patch series to fix the ftrace rethook recursion problem.

v1: https://lore.kernel.org/linux-trace-kernel/cover.1684120990.git.zegao@tencent.com/T/                                 +++#md4c0bae6a6cae28dadf2a2c6105ff140b35fddea

As Steven suggested, this version removes unnecessary notrace annotations from fprobe
and rethook functions from v1 [PATCH 2,3,4/4] and replaces with makefile changes to filter
out compiler flags which ftrace depends upon for rethook related objects.

Ze Gao (4):
  rethook: use preempt_{disable, enable}_notrace in
    rethook_trampoline_handler
  fprobe: make fprobe_kprobe_handler recursion free
  fprobe: add recursion detection in fprobe_exit_handler
  rehook, fprobe: do not trace rethook related functions

 arch/riscv/kernel/probes/Makefile |  2 +
 arch/s390/kernel/Makefile         |  1 +
 arch/x86/kernel/Makefile          |  1 +
 kernel/trace/fprobe.c             | 72 ++++++++++++++++++++++++-------
 kernel/trace/rethook.c            |  4 +-
 5 files changed, 63 insertions(+), 17 deletions(-)

-- 
2.40.1