linux-kernel - Re: [2.6.26 patch] fat_valid

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Message-ID: <484C83D9.2020402@kernel.org>
Date:	Sun, 08 Jun 2008 18:14:01 -0700
From:	"H. Peter Anvin" <hpa@...nel.org>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
CC:	Adrian Bunk <bunk@...nel.org>,
	"S.Çağlar Onur" <caglar@...dus.org.tr>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Frank Seidel <fseidel@...e.de>,
	Onur Küçük <onur@...dus.org.tr>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [2.6.26 patch] fat_valid_media() isn't for userspace

OGAWA Hirofumi wrote:
> 
> Yes. This is new one, so it shouldn't have any users of that.
> Looks more better. Thanks.
> 

The other thing about this header that needs to be fixed is the 
definition of the following ioctls:

#define VFAT_IOCTL_READDIR_BOTH         _IOR('r', 1, struct dirent [2])
#define VFAT_IOCTL_READDIR_SHORT        _IOR('r', 2, struct dirent [2])

"struct dirent" is a kernel type here, but is a **different type** in 
userspace!  This means both the structure and the IOCTL number is wrong!

We need to make this either __kernel_dirent_t[*] or something like 
struct __msdos_fs_dirent.

	-hpa

[*] Yes, typedefs suck, but unfortunately C doesn't allow aliases in the 
structure tag namespace.
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