Date: Tue, 10 Jul 2012 18:07:03 +0400 From: Solar Designer <solar@...nwall.com> To: oss-security@...ts.openwall.com Subject: Re: libdbus hardening On Tue, Jul 10, 2012 at 03:58:46PM +0200, Florian Weimer wrote: > On 07/10/2012 03:43 PM, Solar Designer wrote: > >We already have __secure_getenv() in glibc, which I think is what > >libraries like this should be using on systems with glibc. > > Sebastian's patches also include a check on prctl(PR_GET_DUMPABLE). I'm > not sure if the libc approach (compare effective and real UIDs/GIDs on > process start and base process environment trust decisions on that) is > equivalent. glibc also uses AT_SECURE. PR_GET_DUMPABLE catches the extra case of a process that started e.g. as root and has since switched creds, but do we actually want to restrict processing of env vars in that case? Perhaps not, and so AT_SECURE is more appropriate. Alexander
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