Since these emails go to a list, not just Bill, and are archived, the extra detail is added value and appreciated by other people now & in future.
On Tue, Jun 28, 2016 at 11:06 AM, Bill Zissimopoulos <billz...@navimatics.com> wrote: > On 6/28/16, 3:27 AM, "Corinna Vinschen" <cygwin-ow...@cygwin.com on behalf > of corinna-cyg...@cygwin.com> wrote: > > >>>Ok. Please keep in mind that >> >>a) there can't be a bijective mapping between arbitrary length SIDs >> and a 32 bit uid/gid. >> >>b) The mapping used in Cygwin is not self-created but (mostly, except >> for a single deviation) identical to the Interix mapping. The code >> basically follows how this mapping has been defined by Microsoft. > > Corinna, please stop explaining things to me that I already know. > >>> BTW, I have here a partitioning of the UID namespace that may help >>>choose >>> the right mapping: >>> >>> /* >>> * UID namespace partitioning (from [IDMAP] rules): >>> * >>> * 0x000000 + RID S-1-5-RID,S-1-5-32-RID >>> * 0x000ffe OtherSession >>> * 0x000fff CurrentSession >>> * 0x001000 * X + RID S-1-5-X-RID ([WKSID]: >>> X=1-15,17-21,32,64,80,83) >>> * 0x010000 + 0x100 * X + Y S-1-X-Y ([WKSID]: X=1,2,3,4,5,9,16) >>> * 0x030000 + RID S-1-5-21-X-Y-Z-RID >>> * 0x060000 + RID S-1-16-RID >>> * 0x100000 + RID S-1-5-21-X-Y-Z-RID >>> */ >> >>You're aware that I wrote the code for this mapping as well as its >>documentation? :) > > Corinna, of course I am aware of that. I have found your original post to > this list about it. Why would you think otherwise? And why would it change > anything? > >>>With all that and to help conclude this thread I gather here all the >>> proposed mappings. Corinna, I will use the one which you prefer the >>>most: >>> >>> S-1-0-65534 <-> 65534 >> >>This one is still my favorite. Again, the range from 0x1000 up to >>0xffff is unused. Right now any incoming uid/gid value in this range >>for a reverse SID lookup is treated as invalid SID. > > I disagree. You are saying that it is unused, but a (perhaps erroneous) > SID would map into that space. > > In any case I will use your mapping of S-1-0-65534 <-> 65534. > > Bill > -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
