Ingo Molnar <[email protected]> wrote:
> * Jeff Dike <[email protected]> wrote:
>> Now, there were a couple of ways to legitimately escape from UML, and
>> they *did* involve ptrace. Things like single-stepping a system call
>> instruction or putting a breakpoint on a system call instruction and
>> single-stepping from the breakpoint. As far as I know, these were
>> discovered and fixed by UML developers before there was any outside
>> awareness of these bugs.
>
> also, UML 'ptrace clients' are allowed alot more leeway than what a
> seccomp-alike ptrace/utrace based syscall filter would allow. It would
> clearly exclude activities like 'setting a breakpoint' or
> 'single-stepping' - valid syscalls would be limited to
> read/write/sigreturn/exit.
So instead of breakpointing (using int3), you'd have to write
'mv flag I_AM_HERE;self:jmp self' and resort to polling?
This would not prevent (ab)use except for some corner cases.
--
Ich danke GMX dafür, die Verwendung meiner Adressen mittels per SPF
verbreiteten Lügen zu sabotieren.
http://david.woodhou.se/why-not-spf.html
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