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, "[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?
Jeff
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