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Message-ID: <20120719194339.GA14178@altlinux.org>
Date: Thu, 19 Jul 2012 23:43:39 +0400
From: "Dmitry V. Levin" <ldv@...linux.org>
To: owl-dev@...ts.openwall.com
Subject: Re: strace with restart_syscall output
On Thu, Jul 19, 2012 at 10:56:03PM +0400, Vasily Kulikov wrote:
> On Thu, Jul 19, 2012 at 22:44 +0400, Dmitry V. Levin wrote:
> > On Thu, Jul 19, 2012 at 10:11:17PM +0400, Vasily Kulikov wrote:
> > > root@...alhost:~ # strace -d /bin/true
> > > ptrace_setoptions = 0x11
> > > new tcb for pid 1302, active tcbs:1
> > > [wait(0x137f) = 1302] WIFSTOPPED,sig=SIGSTOP
> > > pid 1302 has TCB_STARTUP, initializing it
> > > setting opts 11 on pid 1302
> > > ignored SIGSTOP on pid 1302
> > > [wait(0x857f) = 1302] WIFSTOPPED,sig=133
> > > restart_syscall(<... resuming interrupted call ...> [wait(0x4057f) = 1302] WIFSTOPPED,sig=SIGTRAP,PTRACE_EVENT_EXEC
> > > [wait(0x857f) = 1302] WIFSTOPPED,sig=133
> > > ) = 0
> > > [wait(0x857f) = 1302] WIFSTOPPED,sig=133
> > > restart_syscall(<... resuming interrupted call ...> [wait(0x0000) = 1302] WIFEXITED,exitcode=0
> > > <unfinished ...>
> > > +++ exited with 0 +++
> > > dropped tcb for pid 1302, 0 remain
> > > root@...alhost:~ #
> >
> > Either PTRACE_GETREGS doesn't work or struct pt_regs defined in
> > <asm/ptrace.h> unexpectedly changed so much that old pt_regs.orig_eax
> > offset is no longer valid. Have you tried to rebuild strace with those
> > kernel headers that match the kernel you test?
>
> Indeed, installing rebuilded strace does help. Thank you!
Then I suppose gdb needs to be recompiled as well.
I wonder why struct pt_regs could have changed so much?
--
ldv
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