Date: Wed, 04 Oct 2017 20:33:16 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-standards@FreeBSD.org Subject: [Bug 220779] getgroups result is affected by setegid Message-ID: <bug-220779-15-CQnO4Q4MLF@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-220779-15@https.bugs.freebsd.org/bugzilla/> References: <bug-220779-15@https.bugs.freebsd.org/bugzilla/>
next in thread | previous in thread | raw e-mail | index | archive | help
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D220779 paulm <paulm@tetrardus.net> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |paulm@tetrardus.net --- Comment #5 from paulm <paulm@tetrardus.net> --- The effective GID is stored in cr_groups[0] in the ucred struct. kern_setgroups() writes to cr_groups[0] in the ucred struct. Therefore, the syscall setgroups(int ngroups, const gid_t *gidset) overwrit= es the effective GID at cr_groups[0] with the first GID in *gidset. (Because setgroups() writes to cr_groups[0], a subsequent call to setegid() will overwrite the supplementary GID at that location. I think this is the symptom Michael Zuo is calling attention to.)=20=20=20=20=20=20 Unless I'm confused about something, the implementation of setgroups() shou= ld write the supplementary group list starting at an offset of +1 in the cr_gr= oups array in struct ucred in order to preserve the effective GID at cr_groups[0= ]. --=20 You are receiving this mail because: You are the assignee for the bug.=
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?bug-220779-15-CQnO4Q4MLF>