On Wed, Apr 17, 2013 at 9:37 AM, Jeff Mitchell
<jeffrey.mitchell@xxxxxxxxx> wrote:
> Henry C Chang wrote:
>>
>> I looked into this problem earlier. The problem is that zfs does not
>> return ERANGE when the size of value buffer passed to getxattr is too
>> small. zfs returns with truncated xattr value.
>
>
> Is this a bug in ZFS, or simply different behavior?
Took a brief look at the zfs code, seems like a zfs bug.
diff --git a/module/zfs/zpl_xattr.c b/module/zfs/zpl_xattr.c
index c03764f..96db7dd 100644
--- a/module/zfs/zpl_xattr.c
+++ b/module/zfs/zpl_xattr.c
@@ -263,6 +263,9 @@ zpl_xattr_get_sa(struct inode *ip, const char
*name, void *value, size_t size)
if (!size)
return (nv_size);
+ if (size < nv_size)
+ return (-ERANGE);
+
memcpy(value, nv_value, MIN(size, nv_size));
return (MIN(size, nv_size));
This should fix it. Not tested of course.
Yehuda
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