From 07094ae6f9527279de6fd0c59e88f6d0423585b1 Mon Sep 17 00:00:00 2001 From: Baolin Wang Date: Tue, 24 Apr 2018 20:06:13 +0800 Subject: ALSA: Avoid using timespec for struct snd_timer_tread The struct snd_timer_tread will use 'timespec' type variables to record timestamp, which is not year 2038 safe on 32bits system. Since the struct snd_timer_tread is passed through read() rather than ioctl(), and the read syscall has no command number that lets us pick between the 32-bit or 64-bit version of this structure. Thus we introduced one new command SNDRV_TIMER_IOCTL_TREAD64 and new struct snd_timer_tread64 replacing timespec with s64 type to handle 64bit time_t. That means we will set tu->tread = TREAD_FORMAT_64BIT when user space has a 64bit time_t, then we will copy to user with struct snd_timer_tread64. Otherwise we will use 32bit time_t variables when copying to user. Moreover this patch replaces timespec type with timespec64 type and related y2038 safe APIs. Signed-off-by: Baolin Wang Signed-off-by: Arnd Bergmann --- include/uapi/sound/asound.h | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) (limited to 'include/uapi') diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index e0ada33afa1e..ad86c5a7a1e2 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -783,7 +783,7 @@ struct snd_timer_status { #define SNDRV_TIMER_IOCTL_PVERSION _IOR('T', 0x00, int) #define SNDRV_TIMER_IOCTL_NEXT_DEVICE _IOWR('T', 0x01, struct snd_timer_id) -#define SNDRV_TIMER_IOCTL_TREAD _IOW('T', 0x02, int) +#define SNDRV_TIMER_IOCTL_TREAD_OLD _IOW('T', 0x02, int) #define SNDRV_TIMER_IOCTL_GINFO _IOWR('T', 0x03, struct snd_timer_ginfo) #define SNDRV_TIMER_IOCTL_GPARAMS _IOW('T', 0x04, struct snd_timer_gparams) #define SNDRV_TIMER_IOCTL_GSTATUS _IOWR('T', 0x05, struct snd_timer_gstatus) @@ -796,6 +796,15 @@ struct snd_timer_status { #define SNDRV_TIMER_IOCTL_STOP _IO('T', 0xa1) #define SNDRV_TIMER_IOCTL_CONTINUE _IO('T', 0xa2) #define SNDRV_TIMER_IOCTL_PAUSE _IO('T', 0xa3) +#define SNDRV_TIMER_IOCTL_TREAD64 _IOW('T', 0xa4, int) + +#if __BITS_PER_LONG == 64 +#define SNDRV_TIMER_IOCTL_TREAD SNDRV_TIMER_IOCTL_TREAD_OLD +#else +#define SNDRV_TIMER_IOCTL_TREAD ((sizeof(__kernel_long_t) >= sizeof(time_t)) ? \ + SNDRV_TIMER_IOCTL_TREAD_OLD : \ + SNDRV_TIMER_IOCTL_TREAD64) +#endif struct snd_timer_read { unsigned int resolution; @@ -821,11 +830,15 @@ enum { SNDRV_TIMER_EVENT_MRESUME = SNDRV_TIMER_EVENT_RESUME + 10, }; +#ifndef __KERNEL__ struct snd_timer_tread { int event; + __time_pad pad1; struct timespec tstamp; unsigned int val; + __time_pad pad2; }; +#endif /**************************************************************************** * * -- cgit v1.2.3