1 files changed, 33 insertions, 18 deletions

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 3d806820280e..1e888c9e85b3 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -161,17 +161,19 @@ static struct loop_func_table *xfer_funcs[MAX_LO_CRYPT] = {
         &xor_funcs
 };
 
-static loff_t get_loop_size(struct loop_device *lo, struct file *file)
+static loff_t get_size(loff_t offset, loff_t sizelimit, struct file *file)
 {
-        loff_t size, offset, loopsize;
+        loff_t size, loopsize;
 
         /* Compute loopsize in bytes */
         size = i_size_read(file->f_mapping->host);
-        offset = lo->lo_offset;
         loopsize = size - offset;
-        if (lo->lo_sizelimit > 0 && lo->lo_sizelimit < loopsize)
-                loopsize = lo->lo_sizelimit;
+        /* offset is beyond i_size, wierd but possible */
+        if (loopsize < 0)
+                return 0;
 
+        if (sizelimit > 0 && sizelimit < loopsize)
+                loopsize = sizelimit;
         /*
          * Unfortunately, if we want to do I/O on the device,
          * the number of 512-byte sectors has to fit into a sector_t.
@@ -179,17 +181,25 @@ static loff_t get_loop_size(struct loop_device *lo, struct file *file)
         return loopsize >> 9;
 }
 
+static loff_t get_loop_size(struct loop_device *lo, struct file *file)
+{
+        return get_size(lo->lo_offset, lo->lo_sizelimit, file);
+}
+
 static int
-figure_loop_size(struct loop_device *lo)
+figure_loop_size(struct loop_device *lo, loff_t offset, loff_t sizelimit)
 {
-        loff_t size = get_loop_size(lo, lo->lo_backing_file);
+        loff_t size = get_size(offset, sizelimit, lo->lo_backing_file);
         sector_t x = (sector_t)size;
 
         if (unlikely((loff_t)x != size))
                 return -EFBIG;
-
+        if (lo->lo_offset != offset)
+                lo->lo_offset = offset;
+        if (lo->lo_sizelimit != sizelimit)
+                lo->lo_sizelimit = sizelimit;
         set_capacity(lo->lo_disk, x);
-        return 0;                                       
+        return 0;
 }
 
 static inline int
@@ -372,7 +382,8 @@ do_lo_receive(struct loop_device *lo,
 
         if (retval < 0)
                 return retval;
-
+        if (retval != bvec->bv_len)
+                return -EIO;
         return 0;
 }
 
@@ -411,7 +422,7 @@ static int do_bio_filebacked(struct loop_device *lo, struct bio *bio)
 
                 /*
                  * We use punch hole to reclaim the free space used by the
-                 * image a.k.a. discard. However we do support discard if
+                 * image a.k.a. discard. However we do not support discard if
                  * encryption is enabled, because it may give an attacker
                  * useful information.
                  */
@@ -786,7 +797,7 @@ static void loop_config_discard(struct loop_device *lo)
         }
 
         q->limits.discard_granularity = inode->i_sb->s_blocksize;
-        q->limits.discard_alignment = inode->i_sb->s_blocksize;
+        q->limits.discard_alignment = 0;
         q->limits.max_discard_sectors = UINT_MAX >> 9;
         q->limits.discard_zeroes_data = 1;
         queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
@@ -1058,9 +1069,7 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
 
         if (lo->lo_offset != info->lo_offset ||
             lo->lo_sizelimit != info->lo_sizelimit) {
-                lo->lo_offset = info->lo_offset;
-                lo->lo_sizelimit = info->lo_sizelimit;
-                if (figure_loop_size(lo))
+                if (figure_loop_size(lo, info->lo_offset, info->lo_sizelimit))
                         return -EFBIG;
         }
         loop_config_discard(lo);
@@ -1246,7 +1255,7 @@ static int loop_set_capacity(struct loop_device *lo, struct block_device *bdev)
         err = -ENXIO;
         if (unlikely(lo->lo_state != Lo_bound))
                 goto out;
-        err = figure_loop_size(lo);
+        err = figure_loop_size(lo, lo->lo_offset, lo->lo_sizelimit);
         if (unlikely(err))
                 goto out;
         sec = get_capacity(lo->lo_disk);
@@ -1284,13 +1293,19 @@ static int lo_ioctl(struct block_device *bdev, fmode_t mode,
                         goto out_unlocked;
                 break;
         case LOOP_SET_STATUS:
-                err = loop_set_status_old(lo, (struct loop_info __user *) arg);
+                err = -EPERM;
+                if ((mode & FMODE_WRITE) || capable(CAP_SYS_ADMIN))
+                        err = loop_set_status_old(lo,
+                                        (struct loop_info __user *)arg);
                 break;
         case LOOP_GET_STATUS:
                 err = loop_get_status_old(lo, (struct loop_info __user *) arg);
                 break;
         case LOOP_SET_STATUS64:
-                err = loop_set_status64(lo, (struct loop_info64 __user *) arg);
+                err = -EPERM;
+                if ((mode & FMODE_WRITE) || capable(CAP_SYS_ADMIN))
+                        err = loop_set_status64(lo,
+                                        (struct loop_info64 __user *) arg);
                 break;
         case LOOP_GET_STATUS64:
                 err = loop_get_status64(lo, (struct loop_info64 __user *) arg);