[PATCH v8 1/2] seccomp: add a return code to trap to userspace
oleg at redhat.com
Fri Nov 30 10:17:51 UTC 2018
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.
> It turns out this is already possible with
> SECCOMP_RET_TRAP (and probably ptrace alone,
> The question is: do we care?
I think we do not care, debugger can do anything with the tracee.
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