[uml-devel] Re: Skas0 general testing?

[Jeff Dike <jdike@addtoit.com>]

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.

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, "6\0\0\0\0\20\0@\0\20\0\0\5\0\0\0\21\0\0\0\3\0\0\0\0p\270"..., 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?

				Jeff


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