diff options
Diffstat (limited to 'sysdeps/mach/hurd/setgid.c')
| -rw-r--r-- | sysdeps/mach/hurd/setgid.c | 49 |
1 files changed, 36 insertions, 13 deletions
diff --git a/sysdeps/mach/hurd/setgid.c b/sysdeps/mach/hurd/setgid.c index 933792b86b..660a3fe5d0 100644 --- a/sysdeps/mach/hurd/setgid.c +++ b/sysdeps/mach/hurd/setgid.c @@ -43,22 +43,45 @@ DEFUN(__setgid, (gid), gid_t gid) /* Make a new auth handle which has GID as the real gid, and as the first element in the list of effective gids. */ - gid_t newgen[_hurd_id.gen.ngids + 1]; - gid_t newaux[_hurd_id.aux.ngids]; - - newgen[0] = gid; - memcpy (&newgen[1], _hurd_id.gen.gids, - _hurd_id.gen.ngids * sizeof (gid_t)); - newaux[0] = gid; - memcpy (&newaux[1], _hurd_id.aux.gids, - (_hurd_id.aux.ngids - 1) * sizeof (gid_t)); + gid_t *newgen, *newaux, auxbuf[2]; + size_t ngen, naux; + + newaux = _hurd_id.aux.gids; + naux = _hurd_id.aux.ngids; + if (_hurd_id.gen.ngids == 0) + { + /* No effective gids now. The new set will be just GID. */ + newgen = &gid; + ngen = 1; + } + else if (_hurd_id.gen.gids[0] == 0) + { + /* We are root; set the effective, real, and saved to GID. */ + _hurd_id.gen.gids[0] = gid; + _hurd_id.valid = 0; + newgen = _hurd_id.gen.gids; + ngen = _hurd_id.gen.ngids; + if (_hurd_id.aux.ngids < 2) + { + newaux = auxbuf; + naux = 2; + } + _hurd_id.aux.gids[0] = _hurd_id.aux.gids[1] = gid; + } + else + { + /* We are not root; just change the effective GID. */ + _hurd_id.gen.gids[0] = gid; + _hurd_id.valid = 0; + newgen = _hurd_id.gen.gids; + ngen = _hurd_id.gen.ngids; + } err = __USEPORT (AUTH, __auth_makeauth (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0, - _hurd_id.gen.uids, _hurd_id.gen.nuids, - _hurd_id.aux.uids, _hurd_id.aux.nuids, - newgen, 1 + _hurd_id.gen.ngids, - newaux, _hurd_id.aux.ngids, + newgen, ngen, newaux, naux, + _hurd_id.gen.gids, _hurd_id.gen.ngids, + _hurd_id.aux.gids, _hurd_id.aux.ngids, &newauth)); } __mutex_unlock (&_hurd_id.lock); |