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Set the open file descriptor limit to the maximum allowed value.

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Each connection can require up to 9 descriptors.
This commit is contained in:
Todd C. Miller
2023-10-27 11:17:32 -06:00
parent bf722e18b7
commit 31bcdec232
1 changed files with 35 additions and 1 deletions
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36
logsrvd/logsrvd.c
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@@ -23,9 +23,10 @@
#include <config.h> #include <config.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h> #include <sys/stat.h>
#include <sys/types.h> #include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h> #include <netinet/in.h>
#include <netinet/tcp.h> #include <netinet/tcp.h>
#include <arpa/inet.h> #include <arpa/inet.h>
@@ -1834,6 +1835,36 @@ write_pidfile(void)
debug_return; debug_return;
} }
/*
* Increase the number of open files to the maximum value.
*/
static void
unlimit_nofile(void)
{
struct rlimit rl = { RLIM_INFINITY, RLIM_INFINITY };
struct rlimit nofilelimit;
debug_decl(unlimit_nofile, SUDO_DEBUG_UTIL);
if (getrlimit(RLIMIT_NOFILE, &nofilelimit) != 0) {
sudo_warn("getrlimit(RLIMIT_NOFILE)");
debug_return;
}
sudo_debug_printf(SUDO_DEBUG_INFO,
"RLIMIT_NOFILE [%lld, %lld] -> [inf, inf]",
(long long)nofilelimit.rlim_cur, (long long)nofilelimit.rlim_max);
if (setrlimit(RLIMIT_NOFILE, &rl) == -1) {
/* Unable to set to infinity, set to max instead. */
rl.rlim_cur = rl.rlim_max = nofilelimit.rlim_max;
sudo_debug_printf(SUDO_DEBUG_INFO,
"RLIMIT_NOFILE [%lld, %lld] -> [%lld, %lld]",
(long long)nofilelimit.rlim_cur, (long long)nofilelimit.rlim_max,
(long long)rl.rlim_cur, (long long)rl.rlim_max);
if (setrlimit(RLIMIT_NOFILE, &rl) != 0)
sudo_warn("setrlimit(RLIMIT_NOFILE)");
}
debug_return;
}
/* /*
* Fork, detach from the terminal and write pid file unless nofork set. * Fork, detach from the terminal and write pid file unless nofork set.
*/ */
@@ -1999,6 +2030,9 @@ main(int argc, char *argv[])
if (!logsrvd_conf_read(conf_file)) if (!logsrvd_conf_read(conf_file))
return EXIT_FAILURE; return EXIT_FAILURE;
/* Crank the open file limit to the maximum value allowed. */
unlimit_nofile();
if ((evbase = sudo_ev_base_alloc()) == NULL) if ((evbase = sudo_ev_base_alloc()) == NULL)
sudo_fatalx(U_("%s: %s"), __func__, U_("unable to allocate memory")); sudo_fatalx(U_("%s: %s"), __func__, U_("unable to allocate memory"));