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Groups > linux.kernel > #1358437
| From | Kamal Mostafa <kamal@canonical.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 4.2.y-ckt 30/98] ALSA: pcm: Fix ioctls for X32 ABI |
| Date | 2016-03-16 01:00 +0100 |
| Message-ID | <rd72A-M3-59@gated-at.bofh.it> (permalink) |
| References | <rd6Jb-EH-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
4.2.8-ckt6 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: Takashi Iwai <tiwai@suse.de>
commit 513ace79b657e2022a592e77f24074e088681ecc upstream.
X32 ABI uses the 64bit timespec in addition to 64bit alignment of
64bit values. This leads to incompatibilities in some PCM ioctls
involved with snd_pcm_channel_info, snd_pcm_status and
snd_pcm_sync_ptr structs. Fix the PCM compat ABI for these ioctls
like the previous commit for ctl API.
Reported-by: Steven Newbury <steve@snewbury.org.uk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
sound/core/pcm_compat.c | 177 +++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 176 insertions(+), 1 deletion(-)
diff --git a/sound/core/pcm_compat.c b/sound/core/pcm_compat.c
index 9630e9f..1f64ab0 100644
--- a/sound/core/pcm_compat.c
+++ b/sound/core/pcm_compat.c
@@ -183,6 +183,14 @@ static int snd_pcm_ioctl_channel_info_compat(struct snd_pcm_substream *substream
return err;
}
+#ifdef CONFIG_X86_X32
+/* X32 ABI has the same struct as x86-64 for snd_pcm_channel_info */
+static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
+ struct snd_pcm_channel_info __user *src);
+#define snd_pcm_ioctl_channel_info_x32(s, p) \
+ snd_pcm_channel_info_user(s, p)
+#endif /* CONFIG_X86_X32 */
+
struct snd_pcm_status32 {
s32 state;
struct compat_timespec trigger_tstamp;
@@ -243,6 +251,71 @@ static int snd_pcm_status_user_compat(struct snd_pcm_substream *substream,
return err;
}
+#ifdef CONFIG_X86_X32
+/* X32 ABI has 64bit timespec and 64bit alignment */
+struct snd_pcm_status_x32 {
+ s32 state;
+ u32 rsvd; /* alignment */
+ struct timespec trigger_tstamp;
+ struct timespec tstamp;
+ u32 appl_ptr;
+ u32 hw_ptr;
+ s32 delay;
+ u32 avail;
+ u32 avail_max;
+ u32 overrange;
+ s32 suspended_state;
+ u32 audio_tstamp_data;
+ struct timespec audio_tstamp;
+ struct timespec driver_tstamp;
+ u32 audio_tstamp_accuracy;
+ unsigned char reserved[52-2*sizeof(struct timespec)];
+} __packed;
+
+#define put_timespec(src, dst) copy_to_user(dst, src, sizeof(*dst))
+
+static int snd_pcm_status_user_x32(struct snd_pcm_substream *substream,
+ struct snd_pcm_status_x32 __user *src,
+ bool ext)
+{
+ struct snd_pcm_status status;
+ int err;
+
+ memset(&status, 0, sizeof(status));
+ /*
+ * with extension, parameters are read/write,
+ * get audio_tstamp_data from user,
+ * ignore rest of status structure
+ */
+ if (ext && get_user(status.audio_tstamp_data,
+ (u32 __user *)(&src->audio_tstamp_data)))
+ return -EFAULT;
+ err = snd_pcm_status(substream, &status);
+ if (err < 0)
+ return err;
+
+ if (clear_user(src, sizeof(*src)))
+ return -EFAULT;
+ if (put_user(status.state, &src->state) ||
+ put_timespec(&status.trigger_tstamp, &src->trigger_tstamp) ||
+ put_timespec(&status.tstamp, &src->tstamp) ||
+ put_user(status.appl_ptr, &src->appl_ptr) ||
+ put_user(status.hw_ptr, &src->hw_ptr) ||
+ put_user(status.delay, &src->delay) ||
+ put_user(status.avail, &src->avail) ||
+ put_user(status.avail_max, &src->avail_max) ||
+ put_user(status.overrange, &src->overrange) ||
+ put_user(status.suspended_state, &src->suspended_state) ||
+ put_user(status.audio_tstamp_data, &src->audio_tstamp_data) ||
+ put_timespec(&status.audio_tstamp, &src->audio_tstamp) ||
+ put_timespec(&status.driver_tstamp, &src->driver_tstamp) ||
+ put_user(status.audio_tstamp_accuracy, &src->audio_tstamp_accuracy))
+ return -EFAULT;
+
+ return err;
+}
+#endif /* CONFIG_X86_X32 */
+
/* both for HW_PARAMS and HW_REFINE */
static int snd_pcm_ioctl_hw_params_compat(struct snd_pcm_substream *substream,
int refine,
@@ -469,6 +542,93 @@ static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream,
return 0;
}
+#ifdef CONFIG_X86_X32
+/* X32 ABI has 64bit timespec and 64bit alignment */
+struct snd_pcm_mmap_status_x32 {
+ s32 state;
+ s32 pad1;
+ u32 hw_ptr;
+ u32 pad2; /* alignment */
+ struct timespec tstamp;
+ s32 suspended_state;
+ struct timespec audio_tstamp;
+} __packed;
+
+struct snd_pcm_mmap_control_x32 {
+ u32 appl_ptr;
+ u32 avail_min;
+};
+
+struct snd_pcm_sync_ptr_x32 {
+ u32 flags;
+ u32 rsvd; /* alignment */
+ union {
+ struct snd_pcm_mmap_status_x32 status;
+ unsigned char reserved[64];
+ } s;
+ union {
+ struct snd_pcm_mmap_control_x32 control;
+ unsigned char reserved[64];
+ } c;
+} __packed;
+
+static int snd_pcm_ioctl_sync_ptr_x32(struct snd_pcm_substream *substream,
+ struct snd_pcm_sync_ptr_x32 __user *src)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ volatile struct snd_pcm_mmap_status *status;
+ volatile struct snd_pcm_mmap_control *control;
+ u32 sflags;
+ struct snd_pcm_mmap_control scontrol;
+ struct snd_pcm_mmap_status sstatus;
+ snd_pcm_uframes_t boundary;
+ int err;
+
+ if (snd_BUG_ON(!runtime))
+ return -EINVAL;
+
+ if (get_user(sflags, &src->flags) ||
+ get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
+ get_user(scontrol.avail_min, &src->c.control.avail_min))
+ return -EFAULT;
+ if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
+ err = snd_pcm_hwsync(substream);
+ if (err < 0)
+ return err;
+ }
+ status = runtime->status;
+ control = runtime->control;
+ boundary = recalculate_boundary(runtime);
+ if (!boundary)
+ boundary = 0x7fffffff;
+ snd_pcm_stream_lock_irq(substream);
+ /* FIXME: we should consider the boundary for the sync from app */
+ if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
+ control->appl_ptr = scontrol.appl_ptr;
+ else
+ scontrol.appl_ptr = control->appl_ptr % boundary;
+ if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
+ control->avail_min = scontrol.avail_min;
+ else
+ scontrol.avail_min = control->avail_min;
+ sstatus.state = status->state;
+ sstatus.hw_ptr = status->hw_ptr % boundary;
+ sstatus.tstamp = status->tstamp;
+ sstatus.suspended_state = status->suspended_state;
+ sstatus.audio_tstamp = status->audio_tstamp;
+ snd_pcm_stream_unlock_irq(substream);
+ if (put_user(sstatus.state, &src->s.status.state) ||
+ put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) ||
+ put_timespec(&sstatus.tstamp, &src->s.status.tstamp) ||
+ put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
+ put_timespec(&sstatus.audio_tstamp, &src->s.status.audio_tstamp) ||
+ put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
+ put_user(scontrol.avail_min, &src->c.control.avail_min))
+ return -EFAULT;
+
+ return 0;
+}
+#endif /* CONFIG_X86_X32 */
/*
*/
@@ -487,7 +647,12 @@ enum {
SNDRV_PCM_IOCTL_WRITEN_FRAMES32 = _IOW('A', 0x52, struct snd_xfern32),
SNDRV_PCM_IOCTL_READN_FRAMES32 = _IOR('A', 0x53, struct snd_xfern32),
SNDRV_PCM_IOCTL_SYNC_PTR32 = _IOWR('A', 0x23, struct snd_pcm_sync_ptr32),
-
+#ifdef CONFIG_X86_X32
+ SNDRV_PCM_IOCTL_CHANNEL_INFO_X32 = _IOR('A', 0x32, struct snd_pcm_channel_info),
+ SNDRV_PCM_IOCTL_STATUS_X32 = _IOR('A', 0x20, struct snd_pcm_status_x32),
+ SNDRV_PCM_IOCTL_STATUS_EXT_X32 = _IOWR('A', 0x24, struct snd_pcm_status_x32),
+ SNDRV_PCM_IOCTL_SYNC_PTR_X32 = _IOWR('A', 0x23, struct snd_pcm_sync_ptr_x32),
+#endif /* CONFIG_X86_X32 */
};
static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
@@ -559,6 +724,16 @@ static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned l
return snd_pcm_ioctl_rewind_compat(substream, argp);
case SNDRV_PCM_IOCTL_FORWARD32:
return snd_pcm_ioctl_forward_compat(substream, argp);
+#ifdef CONFIG_X86_X32
+ case SNDRV_PCM_IOCTL_STATUS_X32:
+ return snd_pcm_status_user_x32(substream, argp, false);
+ case SNDRV_PCM_IOCTL_STATUS_EXT_X32:
+ return snd_pcm_status_user_x32(substream, argp, true);
+ case SNDRV_PCM_IOCTL_SYNC_PTR_X32:
+ return snd_pcm_ioctl_sync_ptr_x32(substream, argp);
+ case SNDRV_PCM_IOCTL_CHANNEL_INFO_X32:
+ return snd_pcm_ioctl_channel_info_x32(substream, argp);
+#endif /* CONFIG_X86_X32 */
}
return -ENOIOCTLCMD;
--
2.7.0
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