On 11/29, Tycho Andersen wrote: > > /* > * These should never be seen by user programs. To return one of ERESTART* > * codes, signal_pending() MUST be set. Note that ptrace can observe these > * at syscall exit tracing, but they will never be left for the debugged user > * process to see. > */ > #define ERESTARTSYS 512 > > So basically, if you respond with -ERESTARTSYS with no signal pending, you'll > leak it to userspace. Yes, > It turns out this is already possible with > SECCOMP_RET_TRAP (and probably ptrace alone, Yes, > The question is: do we care? I think we do not care, debugger can do anything with the tracee. Oleg.
