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[PATCH 054/104] virtiofsd: set maximum RLIMIT_NOFILE limit
From: |
Dr. David Alan Gilbert (git) |
Subject: |
[PATCH 054/104] virtiofsd: set maximum RLIMIT_NOFILE limit |
Date: |
Thu, 12 Dec 2019 16:38:14 +0000 |
From: Stefan Hajnoczi <address@hidden>
virtiofsd can exceed the default open file descriptor limit easily on
most systems. Take advantage of the fact that it runs as root to raise
the limit.
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
tools/virtiofsd/passthrough_ll.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
index ab318a6f36..139bf08f4c 100644
--- a/tools/virtiofsd/passthrough_ll.c
+++ b/tools/virtiofsd/passthrough_ll.c
@@ -52,6 +52,7 @@
#include <sys/file.h>
#include <sys/mount.h>
#include <sys/prctl.h>
+#include <sys/resource.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
@@ -2250,6 +2251,35 @@ static void setup_sandbox(struct lo_data *lo, struct
fuse_session *se)
setup_seccomp();
}
+/* Raise the maximum number of open file descriptors */
+static void setup_nofile_rlimit(void)
+{
+ const rlim_t max_fds = 1000000;
+ struct rlimit rlim;
+
+ if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) {
+ fuse_log(FUSE_LOG_ERR, "getrlimit(RLIMIT_NOFILE): %m\n");
+ exit(1);
+ }
+
+ if (rlim.rlim_cur >= max_fds) {
+ return; /* nothing to do */
+ }
+
+ rlim.rlim_cur = max_fds;
+ rlim.rlim_max = max_fds;
+
+ if (setrlimit(RLIMIT_NOFILE, &rlim) < 0) {
+ /* Ignore SELinux denials */
+ if (errno == EPERM) {
+ return;
+ }
+
+ fuse_log(FUSE_LOG_ERR, "setrlimit(RLIMIT_NOFILE): %m\n");
+ exit(1);
+ }
+}
+
int main(int argc, char *argv[])
{
struct fuse_args args = FUSE_ARGS_INIT(argc, argv);
@@ -2371,6 +2401,8 @@ int main(int argc, char *argv[])
fuse_daemonize(opts.foreground);
+ setup_nofile_rlimit();
+
/* Must be before sandbox since it wants /proc */
setup_capng();
--
2.23.0
- [PATCH 045/104] virtiofsd: prevent ".." escape in lo_do_readdir(), (continued)
- [PATCH 045/104] virtiofsd: prevent ".." escape in lo_do_readdir(), Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 043/104] virtiofsd: check input buffer size in fuse_lowlevel.c ops, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 046/104] virtiofsd: use /proc/self/fd/ O_PATH file descriptor, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 047/104] virtiofsd: sandbox mount namespace, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 048/104] virtiofsd: move to an empty network namespace, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 049/104] virtiofsd: move to a new pid namespace, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 050/104] virtiofsd: add seccomp whitelist, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 051/104] virtiofsd: Parse flag FUSE_WRITE_KILL_PRIV, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 052/104] virtiofsd: cap-ng helpers, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 053/104] virtiofsd: Drop CAP_FSETID if client asked for it, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 054/104] virtiofsd: set maximum RLIMIT_NOFILE limit,
Dr. David Alan Gilbert (git) <=
- [PATCH 057/104] virtiofsd: add --syslog command-line option, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 055/104] virtiofsd: fix libfuse information leaks, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 056/104] virtiofsd: add security guide document, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 059/104] virtiofsd: Add ID to the log with FUSE_LOG_DEBUG level, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 060/104] virtiofsd: Add timestamp to the log with FUSE_LOG_DEBUG level, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 058/104] virtiofsd: print log only when priority is high enough, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 061/104] virtiofsd: Handle reinit, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 062/104] virtiofsd: Handle hard reboot, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 063/104] virtiofsd: Kill threads when queues are stopped, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 064/104] vhost-user: Print unexpected slave message types, Dr. David Alan Gilbert (git), 2019/12/12