lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date:	Sun, 17 Nov 2013 16:21:27 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	virtualization@...ts.linux-foundation.org,
	Ingo Molnar <mingo@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Seiji Aguchi <seiji.aguchi@....com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: Re: [PATCH -tip RFC v2 01/22] kprobes: Prohibit probing on
 .entry.text code

(2013/11/16 2:46), Geert Uytterhoeven wrote:
> On Fri, Nov 15, 2013 at 5:43 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
>> On Fri, 15 Nov 2013 04:53:18 +0000
>> Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:
>>
>>> .entry.text is a code area which is used for interrupt/syscall
>>> entries, and there are many sensitive codes.
>>> Thus, it is better to prohibit probing on all of such codes
>>> instead of a part of that.
>>> Since some symbols are already registered on kprobe blacklist,
>>> this also removes them from the blacklist.
>>
>> This change only works with x86. On other archs, I get this:
>>
>> kernel/built-in.o: In function `register_kprobe':
>> (.kprobes.text+0x9f4): undefined reference to `__entry_text_start'
>> kernel/built-in.o: In function `register_kprobe':
>> (.kprobes.text+0x9f8): undefined reference to `__entry_text_end'
>> make[1]: *** [vmlinux] Error 1
>> make: *** [sub-make] Error 2
> 
> X86 is the sole architecture that has ENTRY_TEXT in its
> arch/*/kernel/vmlinux.lds.S.

Ah, thanks! I'll fix that.
BTW, should I add CONFIG_HAVE_ENTRY_TEXT for x86 and use it
or just use CONFIG_X86 to detect it?

Thank you,

-- 
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists