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| author | Renaud Métrich <rmetrich@redhat.com> | 2019-09-13 11:18:18 +0200 |
|---|---|---|
| committer | Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> | 2019-09-16 08:51:36 +0200 |
| commit | f5e0b942af1e86993c21f4e5c84342bb10403dac (patch) | |
| tree | a629d0401c5f1965ef4f2890086cbfd3fb97d546 /src/basic/user-util.c | |
| parent | 9870c55ef5df8f079cd972b409ec59414869a256 (diff) | |
| download | systemd-f5e0b942af1e86993c21f4e5c84342bb10403dac.tar.gz | |
Call getgroups() to know size of supplementary groups array to allocate
Resolves RHBZ #1743230 - journalctl dumps core when stack limit is reduced to 256 KB
Diffstat (limited to 'src/basic/user-util.c')
| -rw-r--r-- | src/basic/user-util.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/src/basic/user-util.c b/src/basic/user-util.c index 3b253bc264..957285c091 100644 --- a/src/basic/user-util.c +++ b/src/basic/user-util.c @@ -410,9 +410,8 @@ char* gid_to_name(gid_t gid) { } int in_gid(gid_t gid) { - long ngroups_max; gid_t *gids; - int r, i; + int ngroups, r, i; if (getgid() == gid) return 1; @@ -423,12 +422,15 @@ int in_gid(gid_t gid) { if (!gid_is_valid(gid)) return -EINVAL; - ngroups_max = sysconf(_SC_NGROUPS_MAX); - assert(ngroups_max > 0); + ngroups = getgroups(0, NULL); + if (ngroups < 0) + return -errno; + if (ngroups == 0) + return 0; - gids = newa(gid_t, ngroups_max); + gids = newa(gid_t, ngroups); - r = getgroups(ngroups_max, gids); + r = getgroups(ngroups, gids); if (r < 0) return -errno; |