From: Lennart Poettering <lennart@poettering.net>
Date: Thu, 25 Apr 2024 10:44:00 +0000 (+0200)
Subject: varlink: fix varlink_get_peer_pidref() fallback
X-Git-Tag: v256-rc1~10^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F32474%2Fhead;p=thirdparty%2Fsystemd.git

varlink: fix varlink_get_peer_pidref() fallback

let's properly handle old kernels that have no pidfd, and use regular
pids in that case, as intended originally.
---

diff --git a/src/shared/varlink.c b/src/shared/varlink.c
index f1c00a21b61..d96967b8e6a 100644
--- a/src/shared/varlink.c
+++ b/src/shared/varlink.c
@@ -2871,7 +2871,7 @@ int varlink_get_peer_pidref(Varlink *v, PidRef *ret) {
          * authentication. */
 
         r = varlink_acquire_pidfd(v);
-        if (r < 0)
+        if (r < 0 && !ERRNO_IS_NEG_NOT_SUPPORTED(r))
                 return r;
 
         if (v->peer_pidfd < 0) {