* [PATCH] btrfs: ensure that file descriptor used with subvol ioctls is a dir
@ 2016-09-21 12:31 jeffm
2016-09-22 14:42 ` David Sterba
0 siblings, 1 reply; 2+ messages in thread
From: jeffm @ 2016-09-21 12:31 UTC (permalink / raw)
To: linux-btrfs
From: Jeff Mahoney <jeffm@suse.com>
If the subvol/snapshot create/destroy ioctls are passed a regular file
with execute permissions set, we'll eventually Oops while trying to do
inode->i_op->lookup via lookup_one_len.
This patch ensures that the file descriptor refers to a directory.
Fixes: cb8e70901d (Btrfs: Fix subvolume creation locking rules)
Fixes: 76dda93c6a (Btrfs: add snapshot/subvolume destroy ioctl)
Cc: <stable@vger.kernel.org> #v2.6.29+
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
---
fs/btrfs/ioctl.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index b2a2da5..7fd939b 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1634,6 +1634,9 @@ static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
int namelen;
int ret = 0;
+ if (!S_ISDIR(file_inode(file)->i_mode))
+ return -ENOTDIR;
+
ret = mnt_want_write_file(file);
if (ret)
goto out;
@@ -1691,6 +1694,9 @@ static noinline int btrfs_ioctl_snap_create(struct file *file,
struct btrfs_ioctl_vol_args *vol_args;
int ret;
+ if (!S_ISDIR(file_inode(file)->i_mode))
+ return -ENOTDIR;
+
vol_args = memdup_user(arg, sizeof(*vol_args));
if (IS_ERR(vol_args))
return PTR_ERR(vol_args);
@@ -1714,6 +1720,9 @@ static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
bool readonly = false;
struct btrfs_qgroup_inherit *inherit = NULL;
+ if (!S_ISDIR(file_inode(file)->i_mode))
+ return -ENOTDIR;
+
vol_args = memdup_user(arg, sizeof(*vol_args));
if (IS_ERR(vol_args))
return PTR_ERR(vol_args);
@@ -2357,6 +2366,9 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file,
int ret;
int err = 0;
+ if (!S_ISDIR(dir->i_mode))
+ return -ENOTDIR;
+
vol_args = memdup_user(arg, sizeof(*vol_args));
if (IS_ERR(vol_args))
return PTR_ERR(vol_args);
--
2.7.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] btrfs: ensure that file descriptor used with subvol ioctls is a dir
2016-09-21 12:31 [PATCH] btrfs: ensure that file descriptor used with subvol ioctls is a dir jeffm
@ 2016-09-22 14:42 ` David Sterba
0 siblings, 0 replies; 2+ messages in thread
From: David Sterba @ 2016-09-22 14:42 UTC (permalink / raw)
To: jeffm; +Cc: linux-btrfs
On Wed, Sep 21, 2016 at 08:31:29AM -0400, jeffm@suse.com wrote:
> From: Jeff Mahoney <jeffm@suse.com>
>
> If the subvol/snapshot create/destroy ioctls are passed a regular file
> with execute permissions set, we'll eventually Oops while trying to do
> inode->i_op->lookup via lookup_one_len.
>
> This patch ensures that the file descriptor refers to a directory.
>
> Fixes: cb8e70901d (Btrfs: Fix subvolume creation locking rules)
> Fixes: 76dda93c6a (Btrfs: add snapshot/subvolume destroy ioctl)
> Cc: <stable@vger.kernel.org> #v2.6.29+
> Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2016-09-22 14:44 UTC | newest]
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2016-09-21 12:31 [PATCH] btrfs: ensure that file descriptor used with subvol ioctls is a dir jeffm
2016-09-22 14:42 ` David Sterba
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