linux-kernel - [PATCH -v3] Only honor the FIGETBSZ ioctl for regular files and directories

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Date:	Mon, 14 Jun 2010 10:17:57 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Linux Kernel Developers List <linux-kernel@...r.kernel.org>
Cc:	Theodore Ts'o <tytso@....edu>, Al Viro <viro@...IV.linux.org.uk>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Johannes Stezenbach <js@...21.net>
Subject: [PATCH -v3] Only honor the FIGETBSZ ioctl for regular files and directories

FIGETBSZ has an ioctl number of _IO(0x00,2) == 2, which can conflict
with device driver ioctls.  Let's avoid the potential for problems by
only honoring the ioctl number for files where this ioctl is likely
going to be useful: for regular files and directories

Thanks to Johannes Stezenbach for pointing this consequence of commit
19ba0559.

Signed-off-by: "Theodore Ts'o" <tytso@....edu>
Cc: Al Viro <viro@...IV.linux.org.uk>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc: Johannes Stezenbach <js@...21.net>
---

Fixed up commit description

 fs/compat_ioctl.c |    6 +++++-
 fs/ioctl.c        |    5 ++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 641640d..b8607fe 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -1715,8 +1715,12 @@ asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
 		goto out_fput;
 #endif
 
-	case FIBMAP:
 	case FIGETBSZ:
+		if (S_ISDIR(filp->f_path.dentry->d_inode->i_mode))
+			break;
+		/*FALL THROUGH */
+
+	case FIBMAP:
 	case FIONREAD:
 		if (S_ISREG(filp->f_path.dentry->d_inode->i_mode))
 			break;
diff --git a/fs/ioctl.c b/fs/ioctl.c
index 2d140a7..e578dab 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -597,7 +597,10 @@ int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
 	{
 		struct inode *inode = filp->f_path.dentry->d_inode;
 		int __user *p = (int __user *)arg;
-		return put_user(inode->i_sb->s_blocksize, p);
+
+		if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))
+			return put_user(inode->i_sb->s_blocksize, p);
+		/* FALL THROUGH */
 	}
 
 	default:
-- 
1.7.0.4

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