From: Linus Torvalds <torvalds@linux-foundation.org>
To: Richard Biener <rguenther@suse.de>
Cc: Markus Trippelsdorf <markus@trippelsdorf.de>,
Peter Zijlstra <peterz@infradead.org>,
"Luis R. Rodriguez" <mcgrof@kernel.org>,
Vegard Nossum <vegard.nossum@oracle.com>,
Jiri Slaby <jslaby@suse.cz>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable <stable@vger.kernel.org>,
Ming Lei <ming.lei@canonical.com>,
Steven Rostedt <srostedt@redhat.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Cesar Eduardo Barros <cesarb@cesarb.eti.br>,
Michael Matz <matz@suse.de>, David Miller <davem@davemloft.net>,
Guenter Roeck <linux@roeck-us.net>,
Fengguang Wu <fengguang.wu@intel.com>,
Borislav Petkov <bp@alien8.de>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Juergen Gross <jgross@suse.com>,
Kees Cook <keescook@chromium.org>
Subject: Re: [PATCH 01/12] extarray: define helpers for arrays defined in linker scripts
Date: Wed, 2 Nov 2016 09:02:06 -0600 [thread overview]
Message-ID: <CA+55aFxbUd6kZH0ugn-Ss5CqE=MttGD=WChzahAp1k-XFcr7xA@mail.gmail.com> (raw)
In-Reply-To: <alpine.LSU.2.11.1611021313580.5294@t29.fhfr.qr>
On Wed, Nov 2, 2016 at 6:14 AM, Richard Biener <rguenther@suse.de> wrote:
>
> Note while this change restored the old behavior this change was _not_
> intended to fix this particular fallout (it was to fix an inconsistency
> with respect to comparing addresses of symbols that can be interposed).
> It just happens that your externs can be interposed with ELF.
I think it should in general work for the kernel too, since as far as
I can tell, it fundamentally fixes the issue that linker scripts will
set symbol addresses to possibly alias other symbols.
So from a compiler standpoint, I think our "begin/end" linker script
symbols can be seen as interposing a larger array and give bounds for
it. No>
Linus
next prev parent reply other threads:[~2016-11-02 15:02 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-16 15:16 [PATCH 00/12] external array access helpers Vegard Nossum
2016-10-16 15:16 ` [PATCH 01/12] extarray: define helpers for arrays defined in linker scripts Vegard Nossum
2016-10-17 7:04 ` Greg Kroah-Hartman
2016-10-17 8:33 ` Peter Zijlstra
2016-10-17 9:01 ` Jiri Slaby
2016-10-17 9:09 ` Peter Zijlstra
2016-10-17 11:27 ` Vegard Nossum
2016-10-17 11:45 ` Peter Zijlstra
2016-10-18 8:08 ` Vegard Nossum
2016-10-18 21:18 ` Luis R. Rodriguez
2016-10-19 8:18 ` Richard Biener
2016-10-19 9:13 ` Peter Zijlstra
2016-10-19 9:33 ` Richard Biener
2016-10-19 10:25 ` Peter Zijlstra
2016-10-19 11:11 ` Richard Biener
2016-10-19 11:31 ` Peter Zijlstra
2016-11-02 12:11 ` Markus Trippelsdorf
2016-11-02 12:14 ` Richard Biener
2016-11-02 15:02 ` Linus Torvalds [this message]
2016-10-19 7:16 ` Jiri Slaby
2016-10-16 15:16 ` [PATCH 02/12] firmware: declare {__start,__end}_builtin_fw as external array Vegard Nossum
2016-10-16 15:16 ` [PATCH 03/12] ftrace: declare __{start,stop}_mcount_loc " Vegard Nossum
2016-10-16 15:16 ` [PATCH 04/12] tracing: declare __{start,stop}_{annotated_,}branch_profile " Vegard Nossum
2016-10-16 15:16 ` [PATCH 05/12] kprobes: declare __{start,stop}_kprobe_blacklist " Vegard Nossum
2016-10-17 5:53 ` Masami Hiramatsu
2016-10-16 15:16 ` [PATCH 06/12] tracing: declare __{start,stop}_ftrace_events " Vegard Nossum
2016-10-16 15:16 ` [PATCH 07/12] tracing: declare __{start,stop}_ftrace_enum_maps " Vegard Nossum
2016-10-16 15:16 ` [PATCH 08/12] tracing: declare __trace_bprintk_fmt/__tracepoint_str as external arrays Vegard Nossum
2016-10-16 15:16 ` [PATCH 09/12] tracing: declare __{start,stop}_syscalls_metadata as external array Vegard Nossum
2016-10-16 15:16 ` [PATCH 10/12] serial_core: declare __earlycon_table{,_end} " Vegard Nossum
2016-10-16 15:16 ` [PATCH 11/12] jump_label: declare jump table " Vegard Nossum
2016-10-16 16:25 ` Peter Zijlstra
2016-10-16 16:50 ` Vegard Nossum
2016-10-16 17:44 ` Peter Zijlstra
2016-10-17 21:33 ` Steven Rostedt
2016-10-16 15:16 ` [PATCH 12/12] dynamic debug: declare " Vegard Nossum
2016-10-16 16:14 ` [PATCH 00/12] external array access helpers Greg Kroah-Hartman
2016-10-16 17:05 ` Vegard Nossum
2016-10-17 7:02 ` Greg Kroah-Hartman
2016-10-17 6:26 ` Jiri Slaby
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