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loop: reject binding to procfs and sysfs files #910

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loop: reject binding to procfs and sysfs files #910

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9 changes: 8 additions & 1 deletion drivers/block/loop.c
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Original file line number Diff line number Diff line change
Expand Up @@ -496,8 +496,15 @@ static int loop_validate_file(struct file *file, struct block_device *bdev)
rmb();
f = l->lo_backing_file;
}
if (!S_ISREG(inode->i_mode) && !S_ISBLK(inode->i_mode))
if (S_ISBLK(inode->i_mode))
return 0;
if (!S_ISREG(inode->i_mode))
return -EINVAL;
switch (inode->i_sb->s_magic) {
case PROC_SUPER_MAGIC: /* e.g. "losetup -f /proc/sys/kernel/version" */
case SYSFS_MAGIC: /* e.g. "losetup -f /sys/power/state" */
return -EINVAL;
}
return 0;
}

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