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Message-ID: <Pine.BSM.4.64L.2403192046020.21682@herc.mirbsd.org>
Date: Tue, 19 Mar 2024 20:47:00 +0000 (UTC)
From: Thorsten Glaser <tg@...bsd.de>
To: musl@...ts.openwall.com
Subject: Re: Potential bug in __res_msend_rc() wrt to union initialization.
Jₑₙₛ Gustedt dixit:
>seems to be to always put the biggest union member first, or to even
>add an artificial first one `char [size-of-the-union] __dummy;`, such
>that this is always 0-byte initialized if there is any initialization
But then you can just memset the union and then initialise any
known pointer members to NULL/nullptr manually afterwards in the
union’s member you actually need.
(IIRC, POSIX actively specifies the possible pointer members in
these structs for that reason.)
bye,
//mirabilos
--
15:41⎜<Lo-lan-do:#fusionforge> Somebody write a testsuite for helloworld :-)
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