ext4: Fix compat EXT4_IOC_ADD_GROUP

struct ext4_new_group_input needs to be converted because u64 has
only 32-bit alignment on some 32-bit architectures, notably i386.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index d8c28f6..2c1165f 100644 (file)
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -29,6 +29,9 @@
 #include <linux/wait.h>
 #include <linux/blockgroup_lock.h>
 #include <linux/percpu_counter.h>
+#ifdef __KERNEL__
+#include <linux/compat.h>
+#endif
 
 /*
  * The fourth extended filesystem constants/structures
@@ -432,6 +435,18 @@ struct ext4_new_group_input {
        __u16 unused;
 };
 
+#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
+struct compat_ext4_new_group_input {
+       u32 group;
+       compat_u64 block_bitmap;
+       compat_u64 inode_bitmap;
+       compat_u64 inode_table;
+       u32 blocks_count;
+       u16 reserved_blocks;
+       u16 unused;
+};
+#endif
+
 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 struct ext4_new_group_data {
        __u32 group;
@@ -509,6 +524,7 @@ struct ext4_new_group_data {
 #define EXT4_IOC32_GETRSVSZ            _IOR('f', 5, int)
 #define EXT4_IOC32_SETRSVSZ            _IOW('f', 6, int)
 #define EXT4_IOC32_GROUP_EXTEND                _IOW('f', 7, unsigned int)
+#define EXT4_IOC32_GROUP_ADD           _IOW('f', 8, struct compat_ext4_new_group_input)
 #ifdef CONFIG_JBD2_DEBUG
 #define EXT4_IOC32_WAIT_FOR_READONLY   _IOR('f', 99, int)
 #endif

diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 66fa0b0..6ddec84 100644 (file)
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -373,8 +373,29 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
        case EXT4_IOC32_SETRSVSZ:
                cmd = EXT4_IOC_SETRSVSZ;
                break;
-       case EXT4_IOC_GROUP_ADD:
-               break;
+       case EXT4_IOC32_GROUP_ADD: {
+               struct compat_ext4_new_group_input __user *uinput;
+               struct ext4_new_group_input input;
+               mm_segment_t old_fs;
+               int err;
+
+               uinput = compat_ptr(arg);
+               err = get_user(input.group, &uinput->group);
+               err |= get_user(input.block_bitmap, &uinput->block_bitmap);
+               err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
+               err |= get_user(input.inode_table, &uinput->inode_table);
+               err |= get_user(input.blocks_count, &uinput->blocks_count);
+               err |= get_user(input.reserved_blocks,
+                               &uinput->reserved_blocks);
+               if (err)
+                       return -EFAULT;
+               old_fs = get_fs();
+               set_fs(KERNEL_DS);
+               err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
+                                (unsigned long) &input);
+               set_fs(old_fs);
+               return err;
+       }
        case EXT4_IOC_MOVE_EXT:
                break;
        default: