Re: [PATCH -mm v2] coredump: extend core dump note section to contain file names of mapped files

[Oleg Nesterov <oleg@redhat.com>]

On 09/18, Oleg Nesterov wrote:
>
> Or perhaps 'filename = ""' case can handle this case itself. In this
> case we do not even need strlen(), remaining = name - filename.

IOW. Denys, this is up to you and _iirc_ this was already discussed
(just I don't remember the result), but perhaps

	if (IS_ERR(filename)) {
		if (-ENAMETOOLONG) {
			...
			goto retry;
		}
		remaining--;
		*name++ = 0;
	} else {
		remaining = name - filename;
		strcpy(name, filename);
	}

Hmm. And I just noticed that 'filename = ""' case does not verify
there is a room to write a single '\0' :/

So, afaics you also need

	- if (-ENAMETOOLONG)
	+ if (-ENAMETOOLONG || !remaining)

or I missed something.

Oleg.