From: Mark Salyzyn <salyzyn@android.com>
To: James Morris <jmorris@namei.org>
Cc: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
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Subject: Re: [PATCH] Add flags option to get xattr method paired to __vfs_getxattr
Date: Fri, 16 Aug 2019 08:30:30 -0700 [thread overview]
Message-ID: <92b1df4b-6433-7d01-9c08-23de10e8d527@android.com> (raw)
In-Reply-To: <alpine.LRH.2.21.1908160825310.22623@namei.org>
On 8/15/19 3:27 PM, James Morris wrote:
> On Thu, 15 Aug 2019, Mark Salyzyn wrote:
>
>> Good Idea, but using the same argument structure for set and get I would be
>> concerned about the loss of compiler protection for the buffer argument;
> Agreed, I missed that.
Sadly, the pattern of
struct getxattr_args args;
memset(&args, 0, sizeof(args));
args.xxxx = ...
__vfs_getxattr(&args};
...
__vfs_setxattr(&args);
would be nice, so maybe we need to cool our jets and instead:
struct xattr_gs_args {
struct dentry *dentry;
struct inode *inode;
const char *name;
union {
void *buffer;
const void *value;
};
size_t size;
int flags;
};
value _must_ be referenced for all setxattr operations, buffer for getxattr operations (how can we enforce that?).
>> struct getxattr_args {
>> struct dentry *dentry;
>> struct inode *inode;
>> const char *name;
>> void *buffer;
>> size_t size;
>> int flags;
> Does 'get' need flags?
>
:-) That was the _whole_ point of the patch, flags is how we pass in the
recursion so that a security/internal getxattr call has the rights to
acquire the data in the lower layer(s).
-- Mark
prev parent reply other threads:[~2019-08-16 15:30 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-12 19:32 [PATCH] Add flags option to get xattr method paired to __vfs_getxattr Mark Salyzyn
2019-08-13 8:28 ` kbuild test robot
2019-08-13 8:48 ` Greg Kroah-Hartman
2019-08-13 14:37 ` Mark Salyzyn
2019-08-15 19:20 ` James Morris
2019-08-15 20:43 ` Greg Kroah-Hartman
2019-08-15 21:26 ` Mark Salyzyn
2019-08-15 22:27 ` James Morris
2019-08-16 15:30 ` Mark Salyzyn [this message]
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