diff options
Diffstat (limited to 'stdlib/tst-secure-getenv.c')
| -rw-r--r-- | stdlib/tst-secure-getenv.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/stdlib/tst-secure-getenv.c b/stdlib/tst-secure-getenv.c index a682b7493e..6990d6d03e 100644 --- a/stdlib/tst-secure-getenv.c +++ b/stdlib/tst-secure-getenv.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2012-2018 Free Software Foundation, Inc. +/* Copyright (C) 2012-2019 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -13,7 +13,7 @@ You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see - <http://www.gnu.org/licenses/>. */ + <https://www.gnu.org/licenses/>. */ /* Test that secure_getenv works by invoking the test as a SGID program with a group ID from the supplementary group list. This @@ -41,8 +41,14 @@ static char MAGIC_ARGUMENT[] = "run-actual-test"; static gid_t choose_gid (void) { - const int count = 64; - gid_t groups[count]; + int count = getgroups (0, NULL); + if (count < 0) + { + printf ("getgroups: %m\n"); + exit (1); + } + gid_t *groups; + groups = xcalloc (count, sizeof (*groups)); int ret = getgroups (count, groups); if (ret < 0) { @@ -50,12 +56,17 @@ choose_gid (void) exit (1); } gid_t current = getgid (); + gid_t not_current = 0; for (int i = 0; i < ret; ++i) { if (groups[i] != current) - return groups[i]; + { + not_current = groups[i]; + break; + } } - return 0; + free (groups); + return not_current; } |