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Message-ID: <3a2bdc07-e8c4-c340-dde7-516ab0de66f2@intel.com>
Date: Fri, 1 Feb 2019 10:22:22 +0200
From: Adrian Hunter <adrian.hunter@...el.com>
To: Thomas Garnier <thgarnie@...omium.org>,
kernel-hardening@...ts.openwall.com
Cc: 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>, 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>,
Thomas Garnier <thgarnie@...gle.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>,
linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
linux-sparse@...r.kernel.org
Subject: Re: [PATCH v6 15/27] compiler: Option to default to hidden symbols
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?
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