linux-kernel - Re: [GIT PULL] x86/kaslr for v3.14

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Message-ID: <20140128210857.GA1377@redhat.com>
Date:	Tue, 28 Jan 2014 16:08:57 -0500
From:	Dave Jones <davej@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Richard Weinberger <richard@....at>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Kees Cook <keescook@...omium.org>,
	Cong Ding <dinggnu@...il.com>, Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Mathias Krause <minipli@...glemail.com>,
	Michael Davidson <md@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
Subject: Re: [GIT PULL] x86/kaslr for v3.14

On Tue, Jan 28, 2014 at 12:25:15PM -0800, Linus Torvalds wrote:
 > On Tue, Jan 28, 2014 at 12:15 PM, Borislav Petkov <bp@...en8.de> wrote:
 > >
 > > Shouldn't we hold that down in the Kconfig help text of DEBUG_INFO?
 > > Something like:
 > >
 > > "You don't need to enable this if you want symbolic names for kernel
 > > objects. Enable CONFIG_KALLSYMS instead."
 > 
 > Probably. And then we should make sure that allyesconfig/allmodconfig
 > don't pick it.
 > 
 > There *are* reasonable uses for DEBUG_INFO:
 > 
 >  - if you very actively and extensively use kgdb, DEBUG_INFO is very useful.
 > 
 >  - distros might want to build distro kernels with DEBUG_INFO for the
 > kernel debug package

- objdump -S is kind of useful. I find myself using that quite often.
  (like at least a dozen times each merge window)

pretty sure it works with DEBUG_INFO_REDUCED though, which is somewhat
faster than full DEBUG_INFO

	Dave

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