Chen Jingpiao's GSoC status report - #1 of #13

[Chen Jingpiao]

On 05/22 03:56, Masatake YAMATO wrote:

Thank you.

> Hi,
>
> I tried on my Fedora 28 system but it was not reproduced here.
>
>     [yamato at master]/tmp/x/strace% ./strace -eclone ./a.out
>     ./strace -eclone ./a.out
>     clone(child_stack=NULL,
flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD,
child_tidptr=0x7f598063d790) = 23793
>     23793

Sorry, it seems I use -eclone option misleading you. Here I want to check
the tracee output.  The tracee output different from directly run it.
The expected output is:
$ ./strace -eclone -o/dev/null ./a.out (use -eclone for enable seccomp
filter)
23793
0

If add -f option the child process will work properly. It seems child
process
also set seccomp filter. Because strace do not trace it, they do not work
correctly. I will do more research. Thank you.

>     +++ exited with 0 +++
>
> I wonder what happens if you don't use strace like?
>
>     $ gcc fork.c
>     $ ./a.out
>     ???
>
> I also wonder what happens if you remove the 'fprintf' statement from
fork.c.

--
Chen Jingpiao
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