From: Rich Felker <dalias@libc.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: ALSA Development Mailing List <alsa-devel@alsa-project.org>,
Baolin Wang <baolin.wang@linaro.org>,
Takashi Iwai <tiwai@suse.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
musl@lists.openwall.com, Takashi Iwai <tiwai@suse.com>,
Michael Forney <mforney@mforney.org>,
y2038 Mailman List <y2038@lists.linaro.org>,
Mark Brown <broonie@kernel.org>,
Baolin Wang <baolin.wang7@gmail.com>
Subject: Re: [musl] Re: [alsa-devel] [PATCH v7 8/9] ALSA: add new 32-bit layout for snd_pcm_mmap_status/control
Date: Mon, 18 Oct 2021 16:42:04 -0400 [thread overview]
Message-ID: <20211018204203.GM7074@brightrain.aerifal.cx> (raw)
In-Reply-To: <CAK8P3a1RAk5WRtMjqV6QZ1eHtFu_sxhSBJn0Uv-MhRA5WGiJqQ@mail.gmail.com>
On Mon, Oct 18, 2021 at 05:26:35PM +0200, Arnd Bergmann wrote:
> On Mon, Oct 18, 2021 at 5:08 PM Rich Felker <dalias@libc.org> wrote:
> > On Mon, Oct 18, 2021 at 04:58:03PM +0200, Takashi Iwai wrote:
> > > On Mon, 18 Oct 2021 16:43:00 +0200, Rich Felker wrote:
> >
> > No, I don't think so. The musl translator is to translate between the
> > time64 ioctl structures and the old time32 ones for the sake of
> > executing on an old kernel. Up til now, it has been broken comparably
> > to how 32-bit binaries running in compat mode on a 64-bit kernel were
> > broken: the code in musl translated the time64 structure to (and back
> > from) the time32 one assuming the intended padding. But the
> > application was using the actual kernel uapi struct where the padding
> > was (and still is) illogical. Thus, nothing was built with the wrong
> > ABI; it's only the musl-internal translation logic that was wrong (and
> > only pre-time64 kernels are affected).
> >
> > The attached patch should fix it, I think.
> >
> > + int adj = BYTE_ORDER==BIG_ENDIAN ? 4 : 0;
> > + if (dir==W) {
> > + memcpy(old+68, new+72+adj, 4);
> > + memcpy(old+72, new+72+4+2*adj, 4);
>
> I think that should be "new+72+4+3*adj": the "2*adj" would
> be what the code does already for the originally intended
> format.
Well for little endian either would work (because adj is 0 :) but yes
there are 3 such paddings before the second member on big endian, so
it should be 3.
Rich
next prev parent reply other threads:[~2021-10-18 20:43 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-11 21:20 [alsa-devel] [PATCH v7 0/8] Fix year 2038 issue for sound subsystem Arnd Bergmann
2019-12-11 21:20 ` [alsa-devel] [PATCH v7 1/9] ALSA: Replace timespec with timespec64 Arnd Bergmann
2019-12-11 21:20 ` [alsa-devel] [PATCH v7 2/9] ALSA: Avoid using timespec for struct snd_timer_status Arnd Bergmann
2019-12-11 21:20 ` [alsa-devel] [PATCH v7 3/9] ALSA: Avoid using timespec for struct snd_ctl_elem_value Arnd Bergmann
2019-12-11 21:20 ` [alsa-devel] [PATCH v7 4/9] ALSA: Avoid using timespec for struct snd_pcm_status Arnd Bergmann
2019-12-11 21:20 ` [alsa-devel] [PATCH v7 5/9] ALSA: Avoid using timespec for struct snd_rawmidi_status Arnd Bergmann
2019-12-11 21:20 ` [alsa-devel] [PATCH v7 6/9] ALSA: Avoid using timespec for struct snd_timer_tread Arnd Bergmann
2019-12-12 0:14 ` [alsa-devel] [Y2038] " Ben Hutchings
2019-12-12 9:57 ` Arnd Bergmann
2019-12-12 14:27 ` Ben Hutchings
2019-12-13 10:25 ` Arnd Bergmann
2019-12-11 21:20 ` [alsa-devel] [PATCH v7 7/9] ALSA: move snd_pcm_ioctl_sync_ptr_compat into pcm_native.c Arnd Bergmann
2019-12-11 21:20 ` [alsa-devel] [PATCH v7 8/9] ALSA: add new 32-bit layout for snd_pcm_mmap_status/control Arnd Bergmann
2021-10-06 17:49 ` Michael Forney
2021-10-07 10:52 ` Takashi Iwai
2021-10-07 11:48 ` Arnd Bergmann
2021-10-07 12:43 ` Takashi Iwai
2021-10-07 13:02 ` Takashi Iwai
2021-10-07 13:11 ` Arnd Bergmann
2021-10-07 15:33 ` Takashi Iwai
2021-10-07 16:06 ` [musl] " Rich Felker
2021-10-07 16:18 ` Takashi Iwai
2021-10-07 16:51 ` Rich Felker
2021-10-08 8:43 ` Takashi Iwai
2021-10-08 8:44 ` Takashi Iwai
2021-10-08 9:24 ` Arnd Bergmann
2021-10-08 11:11 ` Takashi Iwai
2021-10-08 11:45 ` Arnd Bergmann
2021-10-08 11:53 ` Takashi Iwai
2021-10-08 12:13 ` Arnd Bergmann
2021-10-08 12:07 ` Rich Felker
2021-10-10 7:53 ` Takashi Iwai
2021-10-18 14:43 ` Rich Felker
2021-10-18 14:58 ` Takashi Iwai
2021-10-18 15:08 ` Rich Felker
2021-10-18 15:26 ` Arnd Bergmann
2021-10-18 20:42 ` Rich Felker [this message]
2021-10-19 14:16 ` Rich Felker
2021-10-19 14:23 ` Arnd Bergmann
2021-10-08 12:06 ` Rich Felker
2021-10-08 12:37 ` Arnd Bergmann
2021-10-08 17:20 ` Rich Felker
2019-12-11 21:20 ` [alsa-devel] [PATCH v7 9/9] ALSA: bump uapi version numbers Arnd Bergmann
2019-12-17 10:42 ` [alsa-devel] [PATCH v7 0/8] Fix year 2038 issue for sound subsystem Takashi Iwai
2019-12-17 21:15 ` Arnd Bergmann
2019-12-17 21:16 ` [alsa-devel] [GIT PULL, v8] " Arnd Bergmann
2019-12-17 22:22 ` [alsa-devel] [PATCH v7 0/8] " Takashi Iwai
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