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systemd/SOURCES/0229-Call-getgroups-to-know...

51 lines
1.5 KiB

From e1bd03e75860fb349a6de589bbb1274acc454aef Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Renaud=20M=C3=A9trich?= <rmetrich@redhat.com>
Date: Fri, 13 Sep 2019 11:18:18 +0200
Subject: [PATCH] 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
(cherry picked from commit f5e0b942af1e86993c21f4e5c84342bb10403dac)
Resolves: #1743235
---
src/basic/user-util.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/src/basic/user-util.c b/src/basic/user-util.c
index a562a397c7..c533f67025 100644
--- a/src/basic/user-util.c
+++ b/src/basic/user-util.c
@@ -358,9 +358,8 @@ 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;
@@ -371,12 +370,15 @@ 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;