Hi!
>> > Anyway here is the idea. I added a new task flag PF_RESTRICTED. This bit
>> > is set by setting yourself to the PER_RESTRICTED personality like so:
>> >
>> This can already be done with the current ptrace functionality. Ptrace
>> can intercept system calls made by the traced process (strace uses this)
>> and can modify or deny them.
>>
>
>Can anyone point me to some ptrace() documentation? I've looked at the
>source to strace and several other programs. I can see how to print out
>and trace system calls, but I don't see how to change the return value.
>The manpage for PTRACE_SYSCALL looks like this:
Modify EAX. Take a look at http://subterfugue.org -- it can manipulate syscalls just fine.
>
> PTRACE_SYSCALL, PTRACE_CONT
> Restart after signal.
>
>So assuming I have a process tracing a child process, how to I change the
>return value of system calls made in the child process?
>
>Thanks,
>-Jesse
>
>
>-
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