linux-kernel - Re: [PATCH 4/5] x86-64: Replace vsyscall gettimeofday fallback with int 0xcc

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: <alpine.LNX.2.00.1105292152310.4411@swampdragon.chaosbits.net>
Date:	Sun, 29 May 2011 21:54:18 +0200 (CEST)
From:	Jesper Juhl <jj@...osbits.net>
To:	Andy Lutomirski <luto@....EDU>
cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] x86-64: Replace vsyscall gettimeofday fallback with
 int 0xcc

On Sun, 29 May 2011, Jesper Juhl wrote:

> On Fri, 27 May 2011, Andy Lutomirski wrote:
> 
> > Now the only way to issue a syscall with side effects through the
> > vsyscall page is to call a misaligned instruction.  I haven't
> > checked for that.
> > 
> > Signed-off-by: Andy Lutomirski <luto@....edu>
> > ---
> >  arch/x86/include/asm/traps.h    |    4 +++
> >  arch/x86/include/asm/vsyscall.h |    6 +++++
> >  arch/x86/kernel/entry_64.S      |    2 +
> >  arch/x86/kernel/traps.c         |    4 +++
> >  arch/x86/kernel/vsyscall_64.c   |   47 ++++++++++++++++++++++++++++++++++-----
> >  5 files changed, 57 insertions(+), 6 deletions(-)
> > 
> 
> one very tiny nit below.
> 
> [...]
> > diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
> > index b9b6716..d34894e 100644
> > --- a/arch/x86/kernel/traps.c
> > +++ b/arch/x86/kernel/traps.c
> > @@ -872,6 +872,10 @@ void __init trap_init(void)
> >  	set_bit(SYSCALL_VECTOR, used_vectors);
> >  #endif
> >  
> > +	set_system_intr_gate(0xCC, &intcc);
> > +	set_bit(0xCC, used_vectors);
> > +	printk(KERN_ERR "intcc gate isntalled\n");
> 
> Let's spell the error message correctly:
> 
> 	printk(KERN_ERR "intcc gate installed\n");
> 
Hmm, why is this KERN_ERR btw? Shouldn't it just be KERN_NOTICE or 
KERN_INFO ?

-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
Don't top-post http://www.catb.org/jargon/html/T/top-post.html
Plain text mails only, please.

--
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/