Re: [PATCH] fuse: Only allow read/writing user xattrs

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NAK, this makes no sense...     We are working to support SELinux
attrs on fuse, why shouldn't we?

On Fri, Oct 5, 2012 at 6:50 PM, Eric W. Biederman <ebiederm@xxxxxxxxxxxx> wrote:
>
> In the context of unprivileged mounts supporting anything except
> xattrs with the "user." prefix seems foolish.  Return -EOPNOSUPP
> for all other types of xattrs.
>
> Cc: Miklos Szeredi <miklos@xxxxxxxxxx>
> Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
> ---
>
> Do we really have a kernel bug as blantant as this appears?
>
>  fs/fuse/dir.c |    7 +++++++
>  1 files changed, 7 insertions(+), 0 deletions(-)
>
> diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
> index 45a27c4..260de56 100644
> --- a/fs/fuse/dir.c
> +++ b/fs/fuse/dir.c
> @@ -13,6 +13,7 @@
>  #include <linux/sched.h>
>  #include <linux/namei.h>
>  #include <linux/slab.h>
> +#include <linux/xattr.h>
>
>  #if BITS_PER_LONG >= 64
>  static inline void fuse_dentry_settime(struct dentry *entry, u64 time)
> @@ -1537,6 +1538,9 @@ static int fuse_setxattr(struct dentry *entry, const char *name,
>         if (fc->no_setxattr)
>                 return -EOPNOTSUPP;
>
> +       if (strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) != 0)
> +               return -EOPNOTSUPP;
> +
>         req = fuse_get_req(fc);
>         if (IS_ERR(req))
>                 return PTR_ERR(req);
> @@ -1576,6 +1580,9 @@ static ssize_t fuse_getxattr(struct dentry *entry, const char *name,
>         if (fc->no_getxattr)
>                 return -EOPNOTSUPP;
>
> +       if (strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) != 0)
> +               return -EOPNOTSUPP;
> +
>         req = fuse_get_req(fc);
>         if (IS_ERR(req))
>                 return PTR_ERR(req);
> --
> 1.7.5.4
>
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