From: Steven Rostedt <rostedt@goodmis.org>
To: Sami Tolvanen <samitolvanen@google.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>, X86 ML <x86@kernel.org>,
Kees Cook <keescook@chromium.org>,
Peter Zijlstra <peterz@infradead.org>,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Sedat Dilek <sedat.dilek@gmail.com>,
linux-hardening@vger.kernel.org,
LKML <linux-kernel@vger.kernel.org>,
llvm@lists.linux.dev
Subject: Re: [PATCH v4 06/15] ftrace: Use an opaque type for functions not callable from C
Date: Wed, 6 Oct 2021 12:58:09 -0400 [thread overview]
Message-ID: <20211006125809.5389b2a3@gandalf.local.home> (raw)
In-Reply-To: <CABCJKueL4Ebaan=JBUyO3oewq7RTHHXWUQpixgf2AfC_r5T3uA@mail.gmail.com>
On Wed, 6 Oct 2021 09:31:04 -0700
Sami Tolvanen <samitolvanen@google.com> wrote:
> > > On Thu, Sep 30, 2021 at 11:05:22AM -0700, Sami Tolvanen wrote:
> > > > With CONFIG_CFI_CLANG, the compiler changes function references to point
> > > > to the CFI jump table. As ftrace_call, ftrace_regs_call, and mcount_call
> > > > are not called from C, use DECLARE_ASM_FUNC_SYMBOL to declare them.
> >
> > "not called from C" is a bit confusing.
>
> Any thoughts on how to make this less confusing?
"Not called by C code, but injected by the compiler."
?
-- Steve
next prev parent reply other threads:[~2021-10-06 16:58 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-30 18:05 [PATCH v4 00/15] x86: Add support for Clang CFI Sami Tolvanen
2021-09-30 18:05 ` [PATCH v4 01/15] objtool: Add CONFIG_CFI_CLANG support Sami Tolvanen
2021-09-30 18:40 ` Nick Desaulniers
2021-10-06 3:36 ` Josh Poimboeuf
2021-10-06 16:18 ` Sami Tolvanen
2021-09-30 18:05 ` [PATCH v4 02/15] objtool: Add ASM_STACK_FRAME_NON_STANDARD Sami Tolvanen
2021-10-06 3:37 ` Josh Poimboeuf
2021-09-30 18:05 ` [PATCH v4 03/15] linkage: Add DECLARE_ASM_FUNC_SYMBOL Sami Tolvanen
2021-09-30 18:05 ` [PATCH v4 04/15] cfi: Add DEFINE_CFI_IMMEDIATE_RETURN_STUB Sami Tolvanen
2021-09-30 18:50 ` Nick Desaulniers
2021-10-01 20:07 ` Sami Tolvanen
2021-10-04 13:50 ` Peter Zijlstra
2021-10-04 19:10 ` Sami Tolvanen
2021-10-05 6:59 ` Peter Zijlstra
2021-10-05 20:29 ` Sami Tolvanen
2021-10-05 20:56 ` Peter Zijlstra
2021-10-05 21:53 ` Sami Tolvanen
2021-09-30 18:05 ` [PATCH v4 05/15] tracepoint: Exclude tp_stub_func from CFI checking Sami Tolvanen
2021-09-30 18:50 ` Nick Desaulniers
2021-10-01 20:08 ` Sami Tolvanen
2021-09-30 18:05 ` [PATCH v4 06/15] ftrace: Use an opaque type for functions not callable from C Sami Tolvanen
2021-10-06 3:29 ` Josh Poimboeuf
2021-10-06 13:02 ` Steven Rostedt
2021-10-06 13:54 ` Josh Poimboeuf
2021-10-06 14:16 ` Steven Rostedt
2021-10-06 16:31 ` Sami Tolvanen
2021-10-06 16:58 ` Steven Rostedt [this message]
2021-10-06 17:45 ` Sami Tolvanen
2021-10-06 20:43 ` Josh Poimboeuf
2021-10-06 21:10 ` Steven Rostedt
2021-10-06 21:23 ` Josh Poimboeuf
2021-10-06 23:14 ` Sami Tolvanen
2021-10-07 0:56 ` Steven Rostedt
2021-09-30 18:05 ` [PATCH v4 07/15] lkdtm: Disable UNSET_SMEP with CFI Sami Tolvanen
2021-09-30 18:05 ` [PATCH v4 08/15] lkdtm: Use an opaque type for lkdtm_rodata_do_nothing Sami Tolvanen
2021-09-30 18:05 ` [PATCH v4 09/15] x86: Use an opaque type for functions not callable from C Sami Tolvanen
2021-09-30 18:05 ` [PATCH v4 10/15] x86/purgatory: Disable CFI Sami Tolvanen
2021-09-30 19:05 ` Nick Desaulniers
2021-09-30 18:05 ` [PATCH v4 11/15] x86, relocs: Ignore __typeid__ relocations Sami Tolvanen
2021-10-06 3:31 ` Josh Poimboeuf
2021-10-06 16:17 ` Sami Tolvanen
2021-09-30 18:05 ` [PATCH v4 12/15] x86, module: " Sami Tolvanen
2021-09-30 18:05 ` [PATCH v4 13/15] x86, cpu: Use LTO for cpu.c with CFI Sami Tolvanen
2021-09-30 18:05 ` [PATCH v4 14/15] x86, kprobes: Fix optprobe_template_func type mismatch Sami Tolvanen
2021-09-30 18:05 ` [PATCH v4 15/15] x86, build: Allow CONFIG_CFI_CLANG to be selected Sami Tolvanen
2021-09-30 18:38 ` [PATCH v4 00/15] x86: Add support for Clang CFI Nick Desaulniers
2021-10-05 20:36 ` Josh Poimboeuf
2021-10-05 21:52 ` Sami Tolvanen
2021-10-06 2:42 ` Josh Poimboeuf
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