[PATCH pve-cluster v4 3/3] Create temporary CSR file in /run instead of /tmp

[Arthur Bied-Charreton <a.bied-charreton@proxmox.com>]

As suggested here [0], creating temp files in a world-writable directory
such as /tmp could expose the config generation to symlink races. Use
the /run/pve-cluster directory instead, which is the rundir created by
the cluster filesystem for this purpose [1].

[0]
https://lore.proxmox.com/pve-devel/20260123195300.0ae7fcc9@rosa.proxmox.com/T/#t
[1]
https://lore.proxmox.com/pve-devel/s8o7brad0e6.fsf@toolbox/

Suggested-by: Stoiko Ivanov <s.ivanov@proxmox.com>
Suggested-by: Maximiliano Sandoval <m.sandoval@proxmox.com>
Signed-off-by: Arthur Bied-Charreton <a.bied-charreton@proxmox.com>
---
 src/PVE/Cluster/Setup.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/PVE/Cluster/Setup.pm b/src/PVE/Cluster/Setup.pm
index b9cacfd..e718611 100644
--- a/src/PVE/Cluster/Setup.pm
+++ b/src/PVE/Cluster/Setup.pm
@@ -504,7 +504,7 @@ sub gen_pve_ssl_cert {
         $names .= ",DNS:$fqdn";
     }
 
-    my $reqfn = "/tmp/pvecertreq-$$.tmp";
+    my $reqfn = "/run/pve-cluster/pvecertreq-$$.tmp";
     unlink $reqfn;
 
     my $pvessl_key_fn = "$pmxcfs_base_dir/nodes/$nodename/pve-ssl.key";
-- 
2.47.3