* 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.
Ingo
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