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Commit 941d935a authored by Amir Goldstein's avatar Amir Goldstein Committed by Miklos Szeredi
Browse files

ovl: fix wrong flags check in FS_IOC_FS[SG]ETXATTR ioctls 



The ioctl argument was parsed as the wrong type.

Fixes: b21d9c43 ("ovl: support the FS_IOC_FS[SG]ETXATTR ioctls")
Signed-off-by: default avatarAmir Goldstein <amir73il@gmail.com>
Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
parent d1fdb6d8

fs/overlayfs/file.c

+65 −26
Original line number Diff line number Diff line
@@ -409,37 +409,16 @@ static long ovl_real_ioctl(struct file *file, unsigned int cmd, 
	return ret;

}



static unsigned int ovl_get_inode_flags(struct inode *inode)

{

	unsigned int flags = READ_ONCE(inode->i_flags);

	unsigned int ovl_iflags = 0;



	if (flags & S_SYNC)

		ovl_iflags |= FS_SYNC_FL;

	if (flags & S_APPEND)

		ovl_iflags |= FS_APPEND_FL;

	if (flags & S_IMMUTABLE)

		ovl_iflags |= FS_IMMUTABLE_FL;

	if (flags & S_NOATIME)

		ovl_iflags |= FS_NOATIME_FL;



	return ovl_iflags;

}



static long ovl_ioctl_set_flags(struct file *file, unsigned int cmd,

				unsigned long arg)

				unsigned long arg, unsigned int iflags)

{

	long ret;

	struct inode *inode = file_inode(file);

	unsigned int flags;

	unsigned int old_flags;

	unsigned int old_iflags;



	if (!inode_owner_or_capable(inode))

		return -EACCES;



	if (get_user(flags, (int __user *) arg))

		return -EFAULT;



	ret = mnt_want_write_file(file);

	if (ret)

		return ret;
@@ -448,8 +427,8 @@ static long ovl_ioctl_set_flags(struct file *file, unsigned int cmd, 


	/* Check the capability before cred override */

	ret = -EPERM;

	old_flags = ovl_get_inode_flags(inode);

	if (((flags ^ old_flags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) &&

	old_iflags = READ_ONCE(inode->i_flags);

	if (((iflags ^ old_iflags) & (S_APPEND | S_IMMUTABLE)) &&

	    !capable(CAP_LINUX_IMMUTABLE))

		goto unlock;
@@ -469,6 +448,63 @@ static long ovl_ioctl_set_flags(struct file *file, unsigned int cmd, 


}



static unsigned int ovl_fsflags_to_iflags(unsigned int flags)

{

	unsigned int iflags = 0;



	if (flags & FS_SYNC_FL)

		iflags |= S_SYNC;

	if (flags & FS_APPEND_FL)

		iflags |= S_APPEND;

	if (flags & FS_IMMUTABLE_FL)

		iflags |= S_IMMUTABLE;

	if (flags & FS_NOATIME_FL)

		iflags |= S_NOATIME;



	return iflags;

}



static long ovl_ioctl_set_fsflags(struct file *file, unsigned int cmd,

				  unsigned long arg)

{

	unsigned int flags;



	if (get_user(flags, (int __user *) arg))

		return -EFAULT;



	return ovl_ioctl_set_flags(file, cmd, arg,

				   ovl_fsflags_to_iflags(flags));

}



static unsigned int ovl_fsxflags_to_iflags(unsigned int xflags)

{

	unsigned int iflags = 0;



	if (xflags & FS_XFLAG_SYNC)

		iflags |= S_SYNC;

	if (xflags & FS_XFLAG_APPEND)

		iflags |= S_APPEND;

	if (xflags & FS_XFLAG_IMMUTABLE)

		iflags |= S_IMMUTABLE;

	if (xflags & FS_XFLAG_NOATIME)

		iflags |= S_NOATIME;



	return iflags;

}



static long ovl_ioctl_set_fsxflags(struct file *file, unsigned int cmd,

				   unsigned long arg)

{

	struct fsxattr fa;



	memset(&fa, 0, sizeof(fa));

	if (copy_from_user(&fa, (void __user *) arg, sizeof(fa)))

		return -EFAULT;



	return ovl_ioctl_set_flags(file, cmd, arg,

				   ovl_fsxflags_to_iflags(fa.fsx_xflags));

}



static long ovl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)

{

	long ret;
@@ -480,8 +516,11 @@ static long ovl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 
		break;



	case FS_IOC_SETFLAGS:

		ret = ovl_ioctl_set_fsflags(file, cmd, arg);

		break;



	case FS_IOC_FSSETXATTR:

		ret = ovl_ioctl_set_flags(file, cmd, arg);

		ret = ovl_ioctl_set_fsxflags(file, cmd, arg);

		break;



	default: