From 7b3bfead648da9a5457a639f08eefa96bf4c60d1 Mon Sep 17 00:00:00 2001 From: Ben Hutchings Date: Sun, 30 May 2010 22:50:05 -0400 Subject: [PATCH] ext4: Fix compat EXT4_IOC_ADD_GROUP commit 4d92dc0f00a775dc2e1267b0e00befb783902fe7 upstream (as of v2.6.34-git13) 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 Signed-off-by: "Theodore Ts'o" Signed-off-by: Greg Kroah-Hartman --- fs/ext4/ext4.h | 16 ++++++++++++++++ fs/ext4/ioctl.c | 25 +++++++++++++++++++++++-- 2 files changed, 39 insertions(+), 2 deletions(-) diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 9bc1a338d1f8..b762a05e3a0a 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -29,6 +29,9 @@ #include #include #include +#ifdef __KERNEL__ +#include +#endif /* * The fourth extended filesystem constants/structures @@ -403,6 +406,18 @@ 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; @@ -473,6 +488,7 @@ 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 ce2deb2b9424..bf5ae883b1bd 100644 --- 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: -- 2.39.2