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Hello!

When receiving information about the owner of a multipart upload, an incorrect owner is displayed. The user under whom the information was requested as the owner is displayed. Here are some examples:

I created multipart upload by user 10021_r1, but when I get information about this multipart upload by another user - 10021 (bucket owner) I get this user as the owner:

$ aws s3api list-multipart-uploads --bucket test-r1
{
    "Uploads": [
        {
            "UploadId": "2~O2mADkKD31FWs_DYa95z4f2Aa-aAtEk",
            "Key": "ubuntu-20.04.1-desktop-amd64.iso",
            "Initiated": "2021-09-22T05:25:54.039000+00:00",
            "StorageClass": "STANDARD",
            "Owner": {
                "DisplayName": "10021",
                "ID": "1aee1bc35a500632a0ae8a828a70be72" 
            },
            "Initiator": {
                "ID": "1aee1bc35a500632a0ae8a828a70be72",
                "DisplayName": "10021" 
            }
        },

When I get same information with user 10021_r1 I get this info:

$ aws s3api list-multipart-uploads --bucket test-r1
{
    "Uploads": [
        {
            "UploadId": "2~O2mADkKD31FWs_DYa95z4f2Aa-aAtEk",
            "Key": "ubuntu-20.04.1-desktop-amd64.iso",
            "Initiated": "2021-09-22T05:25:54.039000+00:00",
            "StorageClass": "STANDARD",
            "Owner": {
                "DisplayName": "10021_r1",
                "ID": "ec97fbcff9b95c0fe33749970e470f15" 
            },
            "Initiator": {
                "ID": "ec97fbcff9b95c0fe33749970e470f15",
                "DisplayName": "10021_r1" 
            }
        },

There is no such problem with non-multipart objects, owner always displays correctly.

Second issue. Parts of multipart upload cannot be listed with bucket owner (user 10021 in my case), but multipart uploads lists fine. Some examples:

I can list multipart uploads (but with incorrect owner):

$ aws s3api list-multipart-uploads --bucket test-r1
{
    "Uploads": [
        {
            "UploadId": "2~O2mADkKD31FWs_DYa95z4f2Aa-aAtEk",
            "Key": "ubuntu-20.04.1-desktop-amd64.iso",
            "Initiated": "2021-09-22T05:25:54.039000+00:00",
            "StorageClass": "STANDARD",
            "Owner": {
                "DisplayName": "10021",
                "ID": "1aee1bc35a500632a0ae8a828a70be72" 
            },
            "Initiator": {
                "ID": "1aee1bc35a500632a0ae8a828a70be72",
                "DisplayName": "10021" 
            }
        },

And I can't list it's parts:

$ aws s3api list-parts --bucket test-r1 --key ubuntu-20.04.1-desktop-amd64.iso --upload-id 2~O2mADkKD31FWs_DYa95z4f2Aa-aAtEk

An error occurred (AccessDenied) when calling the ListParts operation: Unknown