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media: v4l2-core: fix compat VIDIOC_DQEVENT for time64 ABI
The native code supports the variant of struct v4l2_event for 64-bit time_t, so add the compat version as well. Here, a new incompatibility arises: while almost all 32-bit architectures now use the same layout as 64-bit architectures and the commands can simply be passed through, on x86 the internal alignment of v4l2_event is different because of the 64-bit member in v4l2_event_ctrl. To handle all architectures, this now requires defining four different versions of the structure to cover all possible combinations. The compat handling for VIDIOC_DQEVENT32 and VIDIOC_DQEVENT32_TIME32 is now inside of an #ifdef so it does not get used on architectures other than x86. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
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@ -1028,6 +1028,15 @@ static int put_v4l2_ext_controls32(struct file *file,
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return 0;
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}
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#ifdef CONFIG_X86_64
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/*
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* x86 is the only compat architecture with different struct alignment
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* between 32-bit and 64-bit tasks.
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*
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* On all other architectures, v4l2_event32 and v4l2_event32_time32 are
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* the same as v4l2_event and v4l2_event_time32, so we can use the native
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* handlers, converting v4l2_event to v4l2_event_time32 if necessary.
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*/
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struct v4l2_event32 {
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__u32 type;
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union {
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@ -1036,7 +1045,23 @@ struct v4l2_event32 {
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} u;
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__u32 pending;
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__u32 sequence;
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struct compat_timespec timestamp;
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struct {
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compat_s64 tv_sec;
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compat_s64 tv_nsec;
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} timestamp;
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__u32 id;
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__u32 reserved[8];
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};
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struct v4l2_event32_time32 {
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__u32 type;
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union {
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compat_s64 value64;
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__u8 data[64];
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} u;
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__u32 pending;
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__u32 sequence;
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struct old_timespec32 timestamp;
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__u32 id;
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__u32 reserved[8];
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};
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@ -1057,6 +1082,23 @@ static int put_v4l2_event32(struct v4l2_event __user *p64,
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return 0;
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}
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static int put_v4l2_event32_time32(struct v4l2_event_time32 __user *p64,
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struct v4l2_event32_time32 __user *p32)
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{
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if (!access_ok(p32, sizeof(*p32)) ||
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assign_in_user(&p32->type, &p64->type) ||
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copy_in_user(&p32->u, &p64->u, sizeof(p64->u)) ||
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assign_in_user(&p32->pending, &p64->pending) ||
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assign_in_user(&p32->sequence, &p64->sequence) ||
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assign_in_user(&p32->timestamp.tv_sec, &p64->timestamp.tv_sec) ||
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assign_in_user(&p32->timestamp.tv_nsec, &p64->timestamp.tv_nsec) ||
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assign_in_user(&p32->id, &p64->id) ||
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copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved)))
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return -EFAULT;
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return 0;
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}
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#endif
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struct v4l2_edid32 {
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__u32 pad;
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__u32 start_block;
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@ -1121,6 +1163,7 @@ static int put_v4l2_edid32(struct v4l2_edid __user *p64,
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#define VIDIOC_S_EXT_CTRLS32 _IOWR('V', 72, struct v4l2_ext_controls32)
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#define VIDIOC_TRY_EXT_CTRLS32 _IOWR('V', 73, struct v4l2_ext_controls32)
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#define VIDIOC_DQEVENT32 _IOR ('V', 89, struct v4l2_event32)
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#define VIDIOC_DQEVENT32_TIME32 _IOR ('V', 89, struct v4l2_event32_time32)
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#define VIDIOC_CREATE_BUFS32 _IOWR('V', 92, struct v4l2_create_buffers32)
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#define VIDIOC_PREPARE_BUF32 _IOWR('V', 93, struct v4l2_buffer32)
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@ -1202,7 +1245,10 @@ static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long ar
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case VIDIOC_G_EXT_CTRLS32: ncmd = VIDIOC_G_EXT_CTRLS; break;
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case VIDIOC_S_EXT_CTRLS32: ncmd = VIDIOC_S_EXT_CTRLS; break;
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case VIDIOC_TRY_EXT_CTRLS32: ncmd = VIDIOC_TRY_EXT_CTRLS; break;
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#ifdef CONFIG_X86_64
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case VIDIOC_DQEVENT32: ncmd = VIDIOC_DQEVENT; break;
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case VIDIOC_DQEVENT32_TIME32: ncmd = VIDIOC_DQEVENT_TIME32; break;
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#endif
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case VIDIOC_OVERLAY32: ncmd = VIDIOC_OVERLAY; break;
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case VIDIOC_STREAMON32: ncmd = VIDIOC_STREAMON; break;
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case VIDIOC_STREAMOFF32: ncmd = VIDIOC_STREAMOFF; break;
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@ -1336,10 +1382,16 @@ static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long ar
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}
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compatible_arg = 0;
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break;
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#ifdef CONFIG_X86_64
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case VIDIOC_DQEVENT32:
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err = alloc_userspace(sizeof(struct v4l2_event), 0, &new_p64);
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compatible_arg = 0;
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break;
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case VIDIOC_DQEVENT32_TIME32:
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err = alloc_userspace(sizeof(struct v4l2_event_time32), 0, &new_p64);
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compatible_arg = 0;
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break;
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#endif
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}
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if (err)
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return err;
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@ -1404,10 +1456,16 @@ static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long ar
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err = put_v4l2_framebuffer32(new_p64, p32);
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break;
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#ifdef CONFIG_X86_64
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case VIDIOC_DQEVENT32:
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err = put_v4l2_event32(new_p64, p32);
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break;
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case VIDIOC_DQEVENT32_TIME32:
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err = put_v4l2_event32_time32(new_p64, p32);
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break;
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#endif
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case VIDIOC_G_EDID32:
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err = put_v4l2_edid32(new_p64, p32);
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break;
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