Date: Tue, 17 Oct 2023 19:43:38 GMT From: Mitchell Horne <mhorne@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: f3de805ace48 - stable/14 - groupmember(): Extract the supplementary group search in a separate function Message-ID: <202310171943.39HJhcPR013417@gitrepo.freebsd.org>
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The branch stable/14 has been updated by mhorne: URL: https://cgit.FreeBSD.org/src/commit/?id=f3de805ace484db4a3bf9191a150ef4843ae92f3 commit f3de805ace484db4a3bf9191a150ef4843ae92f3 Author: Olivier Certner <olce.freebsd@certner.fr> AuthorDate: 2023-08-17 23:54:44 +0000 Commit: Mitchell Horne <mhorne@FreeBSD.org> CommitDate: 2023-10-17 19:42:59 +0000 groupmember(): Extract the supplementary group search in a separate function This is in preparation for the introduction of the new realgroupmember() function, which does the same search into supplementary groups as groupmember(). Reviewed by: mhorne MFC after: 2 weeks Sponsored by: Kumacom SAS Differential Revision: https://reviews.freebsd.org/D40640 (cherry picked from commit b725f232f3b09b4bcbc426854fe1545234c66965) --- sys/kern/kern_prot.c | 41 ++++++++++++++++++++++++----------------- 1 file changed, 24 insertions(+), 17 deletions(-) diff --git a/sys/kern/kern_prot.c b/sys/kern/kern_prot.c index 648c067dc528..21f5e5d3bc16 100644 --- a/sys/kern/kern_prot.c +++ b/sys/kern/kern_prot.c @@ -1273,36 +1273,43 @@ sys___setugid(struct thread *td, struct __setugid_args *uap) } /* - * Check if gid is a member of the group set. + * Returns whether gid designates a supplementary group in cred. */ -int -groupmember(gid_t gid, struct ucred *cred) +static int +supplementary_group_member(gid_t gid, struct ucred *cred) { - int l; - int h; - int m; - - if (cred->cr_groups[0] == gid) - return(1); + int l, h, m; /* - * If gid was not our primary group, perform a binary search - * of the supplemental groups. This is possible because we - * sort the groups in crsetgroups(). + * Perform a binary search of the supplemental groups. This is possible + * because we sort the groups in crsetgroups(). */ l = 1; h = cred->cr_ngroups; + while (l < h) { - m = l + ((h - l) / 2); + m = l + (h - l) / 2; if (cred->cr_groups[m] < gid) - l = m + 1; + l = m + 1; else - h = m; + h = m; } - if ((l < cred->cr_ngroups) && (cred->cr_groups[l] == gid)) + + return (l < cred->cr_ngroups && cred->cr_groups[l] == gid); +} + +/* + * Check if gid is a member of the (effective) group set (i.e., effective and + * supplementary groups). + */ +int +groupmember(gid_t gid, struct ucred *cred) +{ + + if (cred->cr_groups[0] == gid) return (1); - return (0); + return (supplementary_group_member(gid, cred)); } /*
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