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authorTakashi Sakamoto <o-takashi@sakamocchi.jp>2016-03-23 08:03:59 +0900
committerTakashi Iwai <tiwai@suse.de>2016-03-23 08:06:16 +0100
commit91d2178e26fdc806f33063f9df5904a48e3b6aeb (patch)
treebba54fcb578a5fc30a8b4f953cf2e98d628786da /sound
parentc64c1437afb14ebc900e40910f31ffb20bf652ad (diff)
ALSA: timer: fix gparams ioctl compatibility for different architectures
'struct snd_timer_gparams' includes some members with 'unsigned long', therefore its size differs depending on data models of architecture. As a result, x86/x32 applications fail to execute ioctl(2) with SNDRV_TIMER_GPARAMS command on x86_64 machine. This commit fixes this bug by adding a pair of structure and ioctl command for the compatibility. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
-rw-r--r--sound/core/timer.c20
-rw-r--r--sound/core/timer_compat.c30
2 files changed, 42 insertions, 8 deletions
diff --git a/sound/core/timer.c b/sound/core/timer.c
index aa1b15c155d1..ea4d999113ef 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -1502,17 +1502,13 @@ static int snd_timer_user_ginfo(struct file *file,
return err;
}
-static int snd_timer_user_gparams(struct file *file,
- struct snd_timer_gparams __user *_gparams)
+static int timer_set_gparams(struct snd_timer_gparams *gparams)
{
- struct snd_timer_gparams gparams;
struct snd_timer *t;
int err;
- if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
- return -EFAULT;
mutex_lock(&register_mutex);
- t = snd_timer_find(&gparams.tid);
+ t = snd_timer_find(&gparams->tid);
if (!t) {
err = -ENODEV;
goto _error;
@@ -1525,12 +1521,22 @@ static int snd_timer_user_gparams(struct file *file,
err = -ENOSYS;
goto _error;
}
- err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
+ err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
_error:
mutex_unlock(&register_mutex);
return err;
}
+static int snd_timer_user_gparams(struct file *file,
+ struct snd_timer_gparams __user *_gparams)
+{
+ struct snd_timer_gparams gparams;
+
+ if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
+ return -EFAULT;
+ return timer_set_gparams(&gparams);
+}
+
static int snd_timer_user_gstatus(struct file *file,
struct snd_timer_gstatus __user *_gstatus)
{
diff --git a/sound/core/timer_compat.c b/sound/core/timer_compat.c
index 2e908225d754..6a437eb66115 100644
--- a/sound/core/timer_compat.c
+++ b/sound/core/timer_compat.c
@@ -22,6 +22,19 @@
#include <linux/compat.h>
+/*
+ * ILP32/LP64 has different size for 'long' type. Additionally, the size
+ * of storage alignment differs depending on architectures. Here, '__packed'
+ * qualifier is used so that the size of this structure is multiple of 4 and
+ * it fits to any architectures with 32 bit storage alignment.
+ */
+struct snd_timer_gparams32 {
+ struct snd_timer_id tid;
+ u32 period_num;
+ u32 period_den;
+ unsigned char reserved[32];
+} __packed;
+
struct snd_timer_info32 {
u32 flags;
s32 card;
@@ -32,6 +45,19 @@ struct snd_timer_info32 {
unsigned char reserved[64];
};
+static int snd_timer_user_gparams_compat(struct file *file,
+ struct snd_timer_gparams32 __user *user)
+{
+ struct snd_timer_gparams gparams;
+
+ if (copy_from_user(&gparams.tid, &user->tid, sizeof(gparams.tid)) ||
+ get_user(gparams.period_num, &user->period_num) ||
+ get_user(gparams.period_den, &user->period_den))
+ return -EFAULT;
+
+ return timer_set_gparams(&gparams);
+}
+
static int snd_timer_user_info_compat(struct file *file,
struct snd_timer_info32 __user *_info)
{
@@ -99,6 +125,7 @@ static int snd_timer_user_status_compat(struct file *file,
*/
enum {
+ SNDRV_TIMER_IOCTL_GPARAMS32 = _IOW('T', 0x04, struct snd_timer_gparams32),
SNDRV_TIMER_IOCTL_INFO32 = _IOR('T', 0x11, struct snd_timer_info32),
SNDRV_TIMER_IOCTL_STATUS32 = _IOW('T', 0x14, struct snd_timer_status32),
#ifdef CONFIG_X86_X32
@@ -114,7 +141,6 @@ static long snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd, uns
case SNDRV_TIMER_IOCTL_PVERSION:
case SNDRV_TIMER_IOCTL_TREAD:
case SNDRV_TIMER_IOCTL_GINFO:
- case SNDRV_TIMER_IOCTL_GPARAMS:
case SNDRV_TIMER_IOCTL_GSTATUS:
case SNDRV_TIMER_IOCTL_SELECT:
case SNDRV_TIMER_IOCTL_PARAMS:
@@ -128,6 +154,8 @@ static long snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd, uns
case SNDRV_TIMER_IOCTL_PAUSE_OLD:
case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
return snd_timer_user_ioctl(file, cmd, (unsigned long)argp);
+ case SNDRV_TIMER_IOCTL_GPARAMS32:
+ return snd_timer_user_gparams_compat(file, argp);
case SNDRV_TIMER_IOCTL_INFO32:
return snd_timer_user_info_compat(file, argp);
case SNDRV_TIMER_IOCTL_STATUS32: