From: george anzinger <george@mvista.com>
To: Richard Henderson <rth@twiddle.net>,
Mikael Pettersson <mikpe@csd.uu.se>,
Daniel Jacobowitz <dan@debian.org>,
Brian Gerst <bgerst@didntduck.org>,
Petr Vandrovec <VANDROVE@vc.cvut.cz>,
"Richard B. Johnson" <root@chaos.analogic.com>,
dvorak <dvorak@xs4all.nl>,
linux-kernel@vger.kernel.org
Subject: CHECKER bate: Syscall changes registers beyond %eax, on linux-i386
Date: Tue, 24 Sep 2002 11:02:41 -0700 [thread overview]
Message-ID: <3D90A8C1.5390CD82@mvista.com> (raw)
In-Reply-To: 3D8C2928.EC37FEC7@mvista.com
george anzinger wrote:
>
> Richard Henderson wrote:
> >
> > On Fri, Sep 20, 2002 at 01:32:05AM -0700, george anzinger wrote:
> > > So, is there a problem? Yes, neither the call stub macros
> > > in asm/unistd.h nor those in glibc bother to list the used
> > > registers beyond the third ":".
> >
> > No, this is not the real problem. The real problem is that if
> > the program receives a signal during a system call, the kernel
> > will return all the way up to entry.S, deliver the signal and
> > then restart the syscall.
> >
> > Except the syscall will restart with the corrupted registers.
> >
> > Hilarity ensues.
> >
> I submit that BOTH of these are problems. And only the
> kernel can fix the latter.
>
Sounds like a job for the CHECKER. Should be easy to verify
that a system call does not modify its call parameters.
--
George Anzinger george@mvista.com
High-res-timers:
http://sourceforge.net/projects/high-res-timers/
Preemption patch:
http://www.kernel.org/pub/linux/kernel/people/rml
prev parent reply other threads:[~2002-09-24 17:59 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-19 17:44 Syscall changes registers beyond %eax, on linux-i386 Petr Vandrovec
2002-09-19 18:04 ` Brian Gerst
2002-09-19 18:30 ` Richard Henderson
2002-09-19 18:51 ` Brian Gerst
2002-09-19 18:57 ` Richard Henderson
2002-09-19 19:40 ` Richard B. Johnson
2002-09-19 19:41 ` Richard Henderson
2002-09-19 19:53 ` Richard B. Johnson
2002-09-19 22:46 ` J.A. Magallon
2002-09-20 12:27 ` Richard B. Johnson
2002-09-20 17:16 ` Richard Henderson
2002-09-22 1:33 ` Pavel Machek
2002-09-23 13:11 ` Richard B. Johnson
2002-09-23 18:31 ` Pavel Machek
2002-09-19 19:18 ` Richard B. Johnson
2002-09-19 19:24 ` Daniel Jacobowitz
2002-09-19 20:25 ` Mikael Pettersson
2002-09-20 8:32 ` george anzinger
2002-09-21 6:19 ` Richard Henderson
2002-09-21 8:09 ` george anzinger
2002-09-21 15:08 ` Richard Henderson
2002-09-24 18:02 ` george anzinger [this message]
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