This reveals a bug in the tests that require CAP_SET{UID,GID}: After the
child process enters the new user namespace, it ceases to have the
relevant capability in the parent user namespace, so the privileged
write must be done by the parent process. Change tests accordingly.
PiperOrigin-RevId: 241412765
Change-Id: I587c1f24aa6f2180fb2e5e5c0162691ba5bac1bc
In addition to simplifying the implementation, this fixes two bugs:
- seqfile.NewSeqFile unconditionally creates an inode with mode 0444,
but {uid,gid}_map have mode 0644.
- idMapSeqFile.Write implements fs.FileOperations.Write ... but it
doesn't implement any other fs.FileOperations methods and is never
used as fs.FileOperations. idMapSeqFile.GetFile() =>
seqfile.SeqFile.GetFile() uses seqfile.seqFileOperations instead,
which rejects all writes.
PiperOrigin-RevId: 234638212
Change-Id: I4568f741ab07929273a009d7e468c8205a8541bc
Tamir Duberstein
Jamie Liu