bpf: do not blindly change rlimit in reuseport net selftest

If the current process has unlimited RLIMIT_MEMLOCK,
we should should leave it as is.

Fixes: 941ff6f11c02 ("bpf: fix rlimit in reuseport net selftest")
Signed-off-by: John Sperbeck <jsperbeck@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

1 files changed, 9 insertions, 4 deletions

diff --git a/tools/testing/selftests/net/reuseport_bpf.c b/tools/testing/selftests/net/reuseport_bpf.c
index cad14cd0ea92..b5277106df1f 100644
--- a/tools/testing/selftests/net/reuseport_bpf.c
+++ b/tools/testing/selftests/net/reuseport_bpf.c
@@ -437,14 +437,19 @@ void enable_fastopen(void)
         }
 }
 
-static struct rlimit rlim_old, rlim_new;
+static struct rlimit rlim_old;
 
 static  __attribute__((constructor)) void main_ctor(void)
 {
         getrlimit(RLIMIT_MEMLOCK, &rlim_old);
-        rlim_new.rlim_cur = rlim_old.rlim_cur + (1UL << 20);
-        rlim_new.rlim_max = rlim_old.rlim_max + (1UL << 20);
-        setrlimit(RLIMIT_MEMLOCK, &rlim_new);
+
+        if (rlim_old.rlim_cur != RLIM_INFINITY) {
+                struct rlimit rlim_new;
+
+                rlim_new.rlim_cur = rlim_old.rlim_cur + (1UL << 20);
+                rlim_new.rlim_max = rlim_old.rlim_max + (1UL << 20);
+                setrlimit(RLIMIT_MEMLOCK, &rlim_new);
+        }
 }
 
 static __attribute__((destructor)) void main_dtor(void)