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Message-ID: <CAJcbSZEkc2Rc7uemA0Qw2uJhvNciLRxPrMVSQV_-O_N8zozZ_Q@mail.gmail.com>
Date: Fri, 1 Feb 2019 09:35:00 -0800
From: Thomas Garnier <thgarnie@...gle.com>
To: Adrian Hunter <adrian.hunter@...el.com>
Cc: Thomas Garnier <thgarnie@...omium.org>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>, kristen@...ux.intel.com,
Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
"H. Peter Anvin" <hpa@...or.com>, "the arch/x86 maintainers" <x86@...nel.org>, Luis Chamberlain <mcgrof@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Rafael J. Wysocki" <rafael@...nel.org>,
Arnd Bergmann <arnd@...db.de>, Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
Steven Rostedt <rostedt@...dmis.org>, Jason Baron <jbaron@...mai.com>,
Jordan Borgner <mail@...dan-borgner.de>, Masami Hiramatsu <mhiramat@...nel.org>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
"Peter Zijlstra (Intel)" <peterz@...radead.org>, Andrew Morton <akpm@...ux-foundation.org>,
Kees Cook <keescook@...omium.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Arnaldo Carvalho de Melo <acme@...hat.com>, Andi Kleen <ak@...ux.intel.com>, Jan Beulich <JBeulich@...e.com>,
Song Liu <songliubraving@...com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>, LKML <linux-kernel@...r.kernel.org>,
linux-arch <linux-arch@...r.kernel.org>,
Sparse Mailing-list <linux-sparse@...r.kernel.org>
Subject: Re: [PATCH v6 15/27] compiler: Option to default to hidden symbols
On Fri, Feb 1, 2019 at 12:24 AM Adrian Hunter <adrian.hunter@...el.com> wrote:
>
> On 31/01/19 9:24 PM, Thomas Garnier wrote:
> > Provide an option to default visibility to hidden except for key
> > symbols. This option is disabled by default and will be used by x86_64
> > PIE support to remove errors between compilation units.
> >
> > The default visibility is also enabled for external symbols that are
> > compared as they maybe equals (start/end of sections). In this case,
> > older versions of GCC will remove the comparison if the symbols are
> > hidden. This issue exists at least on gcc 4.9 and before.
>
> What does this mean, if anything, for what/how symbols appear in /proc/kallsyms?
No, they will still appear in kallsyms. Some symbols are not absolute
anymore or moved sections but still present.
--
Thomas
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