From: Al Viro Date: Wed, 1 Feb 2006 10:24:20 +0000 (-0500) Subject: [PATCH] drivers/media/video __user annotations and fixes X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=5b1a43d7df65689b4c3b5a1c5c8158f1d4f74fbd;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git [PATCH] drivers/media/video __user annotations and fixes * compat_alloc_user_space() returns __user pointer * copying between two userland areas is copy_in_user(), not copy_from_user() * dereferencing userland pointers is bad * so's get_user() from local variables ... plus usual __user annotations Signed-off-by: Al Viro --- diff --git a/drivers/media/video/compat_ioctl32.c b/drivers/media/video/compat_ioctl32.c index 297c32ab51e3..840fe0177121 100644 --- a/drivers/media/video/compat_ioctl32.c +++ b/drivers/media/video/compat_ioctl32.c @@ -167,29 +167,32 @@ static int get_v4l2_window32(struct v4l2_window *kp, struct v4l2_window32 __user if (kp->clipcount > 2048) return -EINVAL; if (kp->clipcount) { - struct v4l2_clip32 *uclips = compat_ptr(up->clips); - struct v4l2_clip *kclips; + struct v4l2_clip32 __user *uclips; + struct v4l2_clip __user *kclips; int n = kp->clipcount; + compat_caddr_t p; + if (get_user(p, &up->clips)) + return -EFAULT; + uclips = compat_ptr(p); kclips = compat_alloc_user_space(n * sizeof(struct v4l2_clip)); kp->clips = kclips; while (--n >= 0) { - if (!access_ok(VERIFY_READ, &uclips->c, sizeof(uclips->c)) || - copy_from_user(&kclips->c, &uclips->c, sizeof(uclips->c))) + if (copy_in_user(&kclips->c, &uclips->c, sizeof(uclips->c))) + return -EFAULT; + if (put_user(n ? kclips + 1 : NULL, &kclips->next)) return -EFAULT; - kclips->next = n ? kclips + 1 : 0; uclips += 1; kclips += 1; } } else - kp->clips = 0; + kp->clips = NULL; return 0; } static int put_v4l2_window32(struct v4l2_window *kp, struct v4l2_window32 __user *up) { - if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_window32)) || - copy_to_user(&up->w, &kp->w, sizeof(up->w)) || + if (copy_to_user(&up->w, &kp->w, sizeof(up->w)) || put_user(kp->field, &up->field) || put_user(kp->chromakey, &up->chromakey) || put_user(kp->clipcount, &up->clipcount)) @@ -199,33 +202,29 @@ static int put_v4l2_window32(struct v4l2_window *kp, struct v4l2_window32 __user static inline int get_v4l2_pix_format(struct v4l2_pix_format *kp, struct v4l2_pix_format __user *up) { - if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_pix_format)) || - copy_from_user(kp, up, sizeof(struct v4l2_pix_format))) - return -EFAULT; + if (copy_from_user(kp, up, sizeof(struct v4l2_pix_format))) + return -EFAULT; return 0; } static inline int put_v4l2_pix_format(struct v4l2_pix_format *kp, struct v4l2_pix_format __user *up) { - if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_pix_format)) || - copy_to_user(up, kp, sizeof(struct v4l2_pix_format))) - return -EFAULT; + if (copy_to_user(up, kp, sizeof(struct v4l2_pix_format))) + return -EFAULT; return 0; } static inline int get_v4l2_vbi_format(struct v4l2_vbi_format *kp, struct v4l2_vbi_format __user *up) { - if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_vbi_format)) || - copy_from_user(kp, up, sizeof(struct v4l2_vbi_format))) - return -EFAULT; + if (copy_from_user(kp, up, sizeof(struct v4l2_vbi_format))) + return -EFAULT; return 0; } static inline int put_v4l2_vbi_format(struct v4l2_vbi_format *kp, struct v4l2_vbi_format __user *up) { - if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_vbi_format)) || - copy_to_user(up, kp, sizeof(struct v4l2_vbi_format))) - return -EFAULT; + if (copy_to_user(up, kp, sizeof(struct v4l2_vbi_format))) + return -EFAULT; return 0; } @@ -279,18 +278,16 @@ static int put_v4l2_format32(struct v4l2_format *kp, struct v4l2_format32 __user static inline int get_v4l2_standard(struct v4l2_standard *kp, struct v4l2_standard __user *up) { - if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_standard)) || - copy_from_user(kp, up, sizeof(struct v4l2_standard))) - return -EFAULT; + if (copy_from_user(kp, up, sizeof(struct v4l2_standard))) + return -EFAULT; return 0; } static inline int put_v4l2_standard(struct v4l2_standard *kp, struct v4l2_standard __user *up) { - if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_standard)) || - copy_to_user(up, kp, sizeof(struct v4l2_standard))) - return -EFAULT; + if (copy_to_user(up, kp, sizeof(struct v4l2_standard))) + return -EFAULT; return 0; } @@ -328,18 +325,16 @@ static int put_v4l2_standard32(struct v4l2_standard *kp, struct v4l2_standard32 static inline int get_v4l2_tuner(struct v4l2_tuner *kp, struct v4l2_tuner __user *up) { - if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_tuner)) || - copy_from_user(kp, up, sizeof(struct v4l2_tuner))) - return -EFAULT; + if (copy_from_user(kp, up, sizeof(struct v4l2_tuner))) + return -EFAULT; return 0; } static inline int put_v4l2_tuner(struct v4l2_tuner *kp, struct v4l2_tuner __user *up) { - if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_tuner)) || - copy_to_user(up, kp, sizeof(struct v4l2_tuner))) - return -EFAULT; + if (copy_to_user(up, kp, sizeof(struct v4l2_tuner))) + return -EFAULT; return 0; } @@ -380,11 +375,13 @@ static int get_v4l2_buffer32(struct v4l2_buffer *kp, struct v4l2_buffer32 __user break; case V4L2_MEMORY_USERPTR: { - unsigned long tmp = (unsigned long)compat_ptr(up->m.userptr); + compat_long_t tmp; - if(get_user(kp->length, &up->length) || - get_user(kp->m.userptr, &tmp)) - return -EFAULT; + if (get_user(kp->length, &up->length) || + get_user(tmp, &up->m.userptr)) + return -EFAULT; + + kp->m.userptr = (unsigned long)compat_ptr(tmp); } break; case V4L2_MEMORY_OVERLAY: @@ -468,33 +465,29 @@ static int put_v4l2_framebuffer32(struct v4l2_framebuffer *kp, struct v4l2_frame static inline int get_v4l2_input32(struct v4l2_input *kp, struct v4l2_input __user *up) { - if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_input) - 4) || - copy_from_user(kp, up, sizeof(struct v4l2_input) - 4)) - return -EFAULT; + if (copy_from_user(kp, up, sizeof(struct v4l2_input) - 4)) + return -EFAULT; return 0; } static inline int put_v4l2_input32(struct v4l2_input *kp, struct v4l2_input __user *up) { - if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_input) - 4) || - copy_to_user(up, kp, sizeof(struct v4l2_input) - 4)) - return -EFAULT; + if (copy_to_user(up, kp, sizeof(struct v4l2_input) - 4)) + return -EFAULT; return 0; } static inline int get_v4l2_input(struct v4l2_input *kp, struct v4l2_input __user *up) { - if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_input)) || - copy_from_user(kp, up, sizeof(struct v4l2_input))) - return -EFAULT; + if (copy_from_user(kp, up, sizeof(struct v4l2_input))) + return -EFAULT; return 0; } static inline int put_v4l2_input(struct v4l2_input *kp, struct v4l2_input __user *up) { - if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_input)) || - copy_to_user(up, kp, sizeof(struct v4l2_input))) - return -EFAULT; + if (copy_to_user(up, kp, sizeof(struct v4l2_input))) + return -EFAULT; return 0; } diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h index b23be44cbea8..5208b12d5550 100644 --- a/include/linux/videodev2.h +++ b/include/linux/videodev2.h @@ -549,7 +549,7 @@ struct v4l2_framebuffer struct v4l2_clip { struct v4l2_rect c; - struct v4l2_clip *next; + struct v4l2_clip __user *next; }; struct v4l2_window