From: Eric Dumazet <edumazet@google.com>
Date: Sat, 6 Oct 2018 02:38:46 +0000 (-0700)
Subject: bpf: do not blindly change rlimit in reuseport net selftest
X-Git-Tag: v4.19~18^2~39^2~1
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=262f9d811c7608f1e74258ceecfe1fa213bdf912;p=linux.git

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>
---

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)