linux-kernel - [PATCH v2 0/2] x86: kprobes: Fix CFI

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Message-Id: <168904023542.116016.10540228903086100726.stgit@devnote2>
Date:   Tue, 11 Jul 2023 10:50:35 +0900
From:   "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Petr Pavlu <petr.pavlu@...e.com>, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        hpa@...or.com, samitolvanen@...gle.com, x86@...nel.org,
        linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: [PATCH v2 0/2] x86: kprobes: Fix CFI_CLANG related issues

Hi,

Here is the 2nd version of the kprobe patches for kernel CFI.
Previous version is here;

https://lore.kernel.org/all/168899125356.80889.17967397360941194229.stgit@devnote2/

In this version "__pfx_" prefix symbols also are prohibited and that check
is done unconditionally [1/2].

- Prohibit probing on __cfi_* and __pfx_* preamble symbols, which have CFI info.
- Prohibit probing on compiler generated movl/addl which is used for
  detecting typeid on x86.

Thank you,

---

Masami Hiramatsu (Google) (2):
      kprobes: Prohibit probing on CFI preamble symbol
      x86/kprobes: Prohibit probing on compiler generated CFI checking code


 arch/x86/kernel/kprobes/core.c |   34 ++++++++++++++++++++++++++++++++++
 kernel/kprobes.c               |   14 +++++++++++++-
 2 files changed, 47 insertions(+), 1 deletion(-)

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