[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 #3 from commit-hook@FreeBSD.org ---
A commit in branch stable/14 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=f482bc958437e90cf8eb3a9e45e92efeb0b2556e

commit f482bc958437e90cf8eb3a9e45e92efeb0b2556e
Author:     Olivier Certner <olce.freebsd@certner.fr>
AuthorDate: 2023-08-17 23:54:45 +0000
Commit:     Mitchell Horne <mhorne@FreeBSD.org>
CommitDate: 2023-10-17 19:42:59 +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
    Differential Revision:  https://reviews.freebsd.org/D40644

    (cherry picked from commit 91658080f1a598ddda03943a783c9a941199f7d2)
    (cherry picked from commit 0452dd841336cea7cd979b13ef12b6ea5e992eff)

 share/man/man9/cr_bsd_visible.9     |  2 +-
 share/man/man9/cr_canseeothergids.9 |  8 ++++----
 sys/kern/kern_prot.c                | 23 ++++++++++-------------
 3 files changed, 15 insertions(+), 18 deletions(-)

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