X-Recipient: archive-cygwin AT delorie DOT com DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 3D3193858C32 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com; s=default; t=1708939272; bh=bxGAb7IoYa207LkBN/OkV4L6G/p1ok0JeNiQhxfm9zU=; h=Date:To:Subject:References:In-Reply-To:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:Cc: From; b=BhP0evPPFVoGJ6oc/Kk3zKzc8854aZN6P//Fb8CJegfl9QhmWlaT8k5HDQ2v9WrZE xPYYSiUtMa/rsQGpcWLkFevNa8pj762DfbmPwbXb2OLvWV4xpO6rWsvKbPbrcIxbNr yMsq10fO0ECESW9YMDTEa1BmdX0DgtBNeu6PJk3w= X-Original-To: cygwin AT cygwin DOT com Delivered-To: cygwin AT cygwin DOT com DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 2C09A3858CDB Date: Mon, 26 Feb 2024 10:20:48 +0100 To: cygwin AT cygwin DOT com Subject: Re: Will all SIDs fit into |SECURITY_MAX_SID_SIZE| bytes ? / was: Re: Switching groups with newgrp - how to get the new group with |GetTokenInformation()| ? Message-ID: Mail-Followup-To: cygwin AT cygwin DOT com References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-BeenThere: cygwin AT cygwin DOT com X-Mailman-Version: 2.1.30 Precedence: list List-Id: General Cygwin discussions and problem reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Corinna Vinschen via Cygwin Reply-To: cygwin AT cygwin DOT com Cc: Corinna Vinschen Content-Type: text/plain; charset="utf-8" Errors-To: cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com Sender: "Cygwin" Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by delorie.com id 41Q9LDut369661 On Feb 25 22:04, Roland Mainz via Cygwin wrote: > On Sat, Feb 24, 2024 at 7:57 PM Corinna Vinschen via Cygwin > wrote: > > > > On Feb 24 15:38, Roland Mainz via Cygwin wrote: > > > On Thu, Feb 22, 2024 at 8:11 PM Corinna Vinschen via Cygwin > > > wrote: > > > > On Feb 22 18:38, Roland Mainz via Cygwin wrote: > > > > > If I switch the current user's group with /usr/bin/newgrp, how can a > > > > > (native) Win32 process use > > > > > |GetTokenInformation(GetCurrentThreadToken(), ...)| to find out which > > > > > group is the new "current group" (e.g. which |TokenInformationClass| > > > > > should I use) ? > > > > > > > > PSID sidbuf = (PSID) alloca (SECURITY_MAX_SID_SIZE); > > > [snip] > > > > > > Win32/NT API question: All known SIDs will fit into > > > |SECURITY_MAX_SID_SIZE| bytes, right ? I'm asking because right now > > > the ms-nfs41-client code assumes that all SIDs use a variable amount > > > of memory, and we always have to ask the Win32/NT API about the number > > > of bytes to allocate. If |SECURITY_MAX_SID_SIZE| is the global maximum > > > limit for all Windows versions, then we could simplify the code a > > > lot... > > > > Yes. ACLs are size restricted to 64K, though, but that shouldn't be > > much of a problem usally. > > Erm... why ACLs? I was asking about the memory allocation size for an SID. I know, and I wrote "Yes". I mentioned ACLs because ACLs consist of SIDs and if all SIDs take SECURITY_MAX_SID_SIZE bytes... well, no worries. Corinna -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple