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Date: Sun, 20 Oct 2019 21:53:19 +0200 (CEST)
From: Thomas Gleixner <tglx@linutronix.de>
To: Andreas Schwab <schwab@linux-m68k.org>
Subject: Re: passing NULL to clock_getres (VDSO): terminated by unexpected
 signal 11
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Cc: Nathan Lynch <nathanl@linux.ibm.com>,
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On Sun, 20 Oct 2019, Andreas Schwab wrote:
> On Okt 20 2019, Thomas Gleixner wrote:
> 
> > POSIX does not mention anything about the validity of the pointer handed to
> > clock_getres().
> 
> Sure it does: "If the argument res is not NULL, the resolution of the
> specified clock shall be stored in the location pointed to by res.  If
> res is NULL, the clock resolution is not returned.".

Sigh, that makes a lot of sense - NOT.

But for the sake of making a non-sensical specification happy we can add a
NULL pointer check for this. The interesting question is what should be
returned in this case. The kernel returns EFAULT which is probably not
POSIX compliant either.

Patches are welcome.

Thanks,

	tglx