linux-kernel - Re: [PATCH] driver core: add uid and gid to devtmpfs

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Date:	Thu, 11 Apr 2013 00:07:40 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, Kay Sievers <kay@...y.org>
Subject: Re: [PATCH] driver core: add uid and gid to devtmpfs

On Wed, Apr 10, 2013 at 11:56 PM, Greg KH <gregkh@...uxfoundation.org> wrote:
> On Wed, Apr 10, 2013 at 05:12:17PM +0800, Ming Lei wrote:
>> On Sun, Apr 7, 2013 at 12:56 AM, Greg KH <gregkh@...uxfoundation.org> wrote:
>> > @@ -201,14 +206,14 @@ static int handle_create(const char *nod
>> >         if (IS_ERR(dentry))
>> >                 return PTR_ERR(dentry);
>> >
>> > -       err = vfs_mknod(path.dentry->d_inode,
>> > -                       dentry, mode, dev->devt);
>> > +       err = vfs_mknod(path.dentry->d_inode, dentry, mode, dev->devt);
>> >         if (!err) {
>> >                 struct iattr newattrs;
>> >
>> > -               /* fixup possibly umasked mode */
>> >                 newattrs.ia_mode = mode;
>> > -               newattrs.ia_valid = ATTR_MODE;
>> > +               newattrs.ia_uid = uid;
>> > +               newattrs.ia_gid = gid;
>>
>> drivers/base/devtmpfs.c: In function 'handle_create':
>> drivers/base/devtmpfs.c:214:19: error: incompatible types when
>> assigning to type 'kuid_t' from type 'uid_t'
>> drivers/base/devtmpfs.c:215:19: error: incompatible types when
>> assigning to type 'kgid_t' from type 'gid_t'
>> make[2]: *** [drivers/base/devtmpfs.o] Error 1
>
> I can't duplicate this here, what options am I missing?

With CONFIG_UIDGID_STRICT_TYPE_CHECKS

>
>> Looks the below patch may fix it.
>> --
>> diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
>> index fda5256..e268fc5 100644
>> --- a/drivers/base/devtmpfs.c
>> +++ b/drivers/base/devtmpfs.c
>> @@ -211,8 +211,8 @@ static int handle_create(const char *nodename,
>> umode_t mode, uid_t uid,
>>               struct iattr newattrs;
>>
>>               newattrs.ia_mode = mode;
>> -             newattrs.ia_uid = uid;
>> -             newattrs.ia_gid = gid;
>> +             newattrs.ia_uid = KUIDT_INIT(uid);
>> +             newattrs.ia_gid = KGIDT_INIT(gid);
>>               newattrs.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID;
>>               mutex_lock(&dentry->d_inode->i_mutex);
>>               notify_change(dentry, &newattrs);
>>
>
> Care to resend this in a format I can apply it in?  :)

OK.

thanks,
--
Ming Lei
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