[Bug 272093] The 'see_other_gids' security policy considers the effective group IDs and not the real ones

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272093

--- Comment #1 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=91658080f1a598ddda03943a783c9a941199f7d2

commit 91658080f1a598ddda03943a783c9a941199f7d2
Author:     Olivier Certner <olce.freebsd@certner.fr>
AuthorDate: 2023-08-17 23:54:45 +0000
Commit:     Mitchell Horne <mhorne@FreeBSD.org>
CommitDate: 2023-09-28 15:05:46 +0000

    cr_canseeothergids(): Use real instead of effective group membership

    Using the effective group and not the real one when testing membership
    has the consequence that unprivileged processes cannot see setuid
    commands they launch until these have relinquished their privileges.
    This is also in contradiction with how the similar cr_canseeotheruids()
    works, i.e., by taking into account real user IDs.

    Fix this by substituting groupmember() with realgroupmember().  While
    here, simplify the code.

    PR:                     272093
    Reviewed by:            mhorne
    MFC after:              2 weeks
    Sponsored by:           Kumacom SAS
    Differential Revision:  https://reviews.freebsd.org/D40642

 sys/kern/kern_prot.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

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