linux-kernel - Re: [PATCH v3 5/7] kprobes/x86: Fix %p uses in error messages

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] [thread-next>] [day] [month] [year] [list]

Message-Id: <20180428000630.aa8584a67686dd68d1bc9f83@kernel.org>
Date:   Sat, 28 Apr 2018 00:06:30 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Ananth N Mavinakayanahalli <ananth@...ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jon Medhurst <tixy@...aro.org>,
        Will Deacon <will.deacon@....com>,
        Arnd Bergmann <arnd@...db.de>,
        David Howells <dhowells@...hat.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        "Tobin C . Harding" <me@...in.cc>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        akpm@...ux-foundation.org, acme@...nel.org, rostedt@...dmis.org,
        brueckner@...ux.vnet.ibm.com, schwidefsky@...ibm.com,
        stable@...r.kernel.org
Subject: Re: [PATCH v3 5/7] kprobes/x86: Fix %p uses in error messages

On Fri, 27 Apr 2018 08:58:17 +0200
Ingo Molnar <mingo@...nel.org> wrote:

> 
> * Masami Hiramatsu <mhiramat@...nel.org> wrote:
> 
> >  	    (addr < (u8 *) jprobe_return_end)) {
> >  		if (stack_addr(regs) != saved_sp) {
> >  			struct pt_regs *saved_regs = &kcb->jprobe_saved_regs;
> > -			printk(KERN_ERR
> > -			       "current sp %p does not match saved sp %p\n",
> > +			pr_err("current sp %pS does not match saved sp %pS\n",
> >  			       stack_addr(regs), saved_sp);
> 
> Why does this use %pS? Stack pointers are typically pointing into general kernel 
> RAM, which is totally pointless to display 'symbolically'.

That was I pointed in the last thread, but not accepted.
OK, anyway, there are no good reason to show such a dynamic value.
And now jprobes are gone. I just drop %p from this part.

Thanks,


-- 
Masami Hiramatsu <mhiramat@...nel.org>