[PATCH v3 2/2] tests: Workaroud for buggy glibc in ipc_msg test on ppc64

[Eugene Syromyatnikov]

On Tue, Sep 13, 2016 at 7:32 AM, Andreas Schwab <schwab at suse.de> wrote:
> On Sep 13 2016, Eugene Syromyatnikov <evgsyr-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org> wrote:
>
>> glibc before 2.23 (glibc-2.22-122-gbe48165? to be more precise) tried to access
>> data pointed by third argument of msgctl call on 64-bit PowerPC which led to
>> segmentataion fault (instead of EFAULT from kernel).
>
> Which is a perfectly valid thing to do, as passing an invalid pointer to
> msgctl (the libc function) invokes undefined behaviour.  If you want to
> test the kernel behaviour you need to talk to the kernel directly.
Well, http://man7.org/linux/man-pages/man2/msgctl.2.html documents
this case as EFAULT (and I assume it documents glibc wrapper since it
usually does so and kernel interface is architecture-dependent).

> Andreas.
>
> --
> Andreas Schwab, SUSE Labs, schwab at suse.de
> GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
> "And now for something completely different."
>
> ------------------------------------------------------------------------------
> _______________________________________________
> Strace-devel mailing list
> Strace-devel at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/strace-devel



-- 
Eugene "eSyr" Syromyatnikov
mailto:evgSyr at gmail.com
xmpp:eSyr at jabber.{ru|org}