From: Lennart Poettering <lennart@poettering.net>
Date: Tue, 26 Sep 2023 07:52:05 +0000 (+0200)
Subject: udev: raise RLIMIT_NOFILE as high as we can
X-Git-Tag: v255-rc1~428
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=1617424ce76d797d081dd6cb1082b954c4d2bf38;p=thirdparty%2Fsystemd.git

udev: raise RLIMIT_NOFILE as high as we can

We might need a lot of fds on large systems, hence raise RLIMIT_NOFILE
to what the service manager allows us, which is quite a lot these days.

udev already sets FORK_RLIMIT_NOFILE_SAFE when forking of chilren, thus
ensuring that forked off processes get their RLIMIT_NOFILE soft limit
reset to 1K for compat with crappy old select().

Replaces: #29298
Fixes: #28583
---

diff --git a/src/udev/udevd.c b/src/udev/udevd.c
index 257336aec6f..2ed4282253e 100644
--- a/src/udev/udevd.c
+++ b/src/udev/udevd.c
@@ -18,6 +18,7 @@
 #include "pretty-print.h"
 #include "proc-cmdline.h"
 #include "process-util.h"
+#include "rlimit-util.h"
 #include "selinux-util.h"
 #include "signal-util.h"
 #include "syslog-util.h"
@@ -365,6 +366,9 @@ int run_udevd(int argc, char *argv[]) {
         if (r < 0)
                 return r;
 
+        /* Make sure we can have plenty fds (for example for pidfds) */
+        (void) rlimit_nofile_bump(-1);
+
         r = RET_NERRNO(mkdir("/run/udev", 0755));
         if (r < 0 && r != -EEXIST)
                 return log_error_errno(r, "Failed to create /run/udev: %m");