On Thursday 30 June 2005 16:31, Jeff Dike wrote:
> On Thu, Jun 23, 2005 at 03:36:26AM +0200, Blaisorblade wrote:
> > I specified "operations done on the host" exactly for this purpose. That
> > patch will touch SKAS3 code, but if I set all three options to "yes" the
> > code should do the same things (again, in terms of strace output).
> >
> > But however, if to keep the code clean we change (let's say) where a
> > certain signal handler is set to later in the boot process, *hoping* that
> > it does not hurt, that's against my definition.
> OK, I straced UML booting and shutting down on a skas3 host, with and
> without the skas0 patch.
Interesting, you'll tell the world how you deleted all the junk out of this...
(possibly on the Wiki but email is ok).
> I looked at the initialization, syscall interception, and page fault
> handing, and they are identical in the two runs:
> Initialization:
> access("/proc/mm", W_OK) = 0
> write(1, "Checking for /proc/mm...found\n", 30) = 30
> fork() = 25144
> wait4(25144, [WIFSTOPPED(s) && WSTOPSIG(s) == SIGSTOP], WUNTRACED,
> NULL) =
> 25144 --- SIGCHLD (Child exited) ---
> ptrace(PTRACE_???, 25144, 0, 0xbffff7e0) = 0
> write(1, "Checking for the skas3 patch in "..., 49) = 49
> ptrace(PTRACE_???, 25144, 0, 0x823c100) = 0
> ptrace(PTRACE_???, 25144, 0, 0x823c1e0) = 0
> ptrace(PTRACE_CONT, 25144, 0, SIG_0) = 0
>
> Syscall interception:
>
> wait4(25145, [WIFSTOPPED(s) && WSTOPSIG(s) == SIGSEGV], WUNTRACED,
> NULL) =
> 25145 ptrace(PTRACE_???, 25145, 0, 0x8a41888) = 0
> ptrace(PTRACE_???, 25145, 0, 0x8a41938) = 0
> ptrace(PTRACE_???, 25145, 0, 0x8a41b38) = 0
> write(14, "[EMAIL PROTECTED]"...,
> 28) = 28 ptrace(PTRACE_???, 25145, 0, 0x8a41888) = 0
> ptrace(PTRACE_???, 25145, 0, 0x8a41938) = 0
> ptrace(PTRACE_SYSCALL, 25145, 0, SIG_0) = 0
>
> Page fault:
>
> wait4(25145, [WIFSTOPPED(s) && WSTOPSIG(s) == 133], WUNTRACED, NULL) =
> 25145 ptrace(PTRACE_???, 25145, 0, 0x8a41888) = 0
> ptrace(PTRACE_???, 25145, 0, 0x8a41938) = 0
> ptrace(PTRACE_POKEUSER, 25145, 4*ORIG_EAX, 0x14) = 0
> ptrace(PTRACE_SYSCALL, 25145, 0, SIG_0) = 0
> --- SIGCHLD (Child exited) ---
> wait4(25145, [WIFSTOPPED(s) && WSTOPSIG(s) == 133], WUNTRACED, NULL) =
> 25145 ptrace(PTRACE_???, 25145, 0, 0x8a41888) = 0
> ptrace(PTRACE_???, 25145, 0, 0x8a41938) = 0
> ptrace(PTRACE_SYSCALL, 25145, 0, SIG_0) = 0
>
> With this, are you OK with skas0 being sent to Andrew?
Yes, I'm fine. Send it for -mm now
I'd also like to ship it against 2.6.12 for wider testing.
And the open question is: we (actually you) tested the whole patchset; is
there any known bug (for skas0) fixed only by patches we are leaving out?
--
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade
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