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Taken from http://pkgs.fedoraproject.org/cgit/rpms/fcgi.git/plain/fcgi-2.4.0-poll.patch
Fixes CVE-2012-6687.
Author: Anton Kortunov <toshic.toshic@gmail.com>
Bug-Ubuntu: https://bugs.launchpad.net/ubuntu/+source/libfcgi/+bug/933417
Description: use poll in os_unix.c instead of select to avoid problem with > 1024 connections
Forwarded: yes, fastcgi-developers@mailman.fastcgi.com
diff --git a/libfcgi/os_unix.c b/libfcgi/os_unix.c
index 73e6a7f..af35aee 100755
--- a/libfcgi/os_unix.c
+++ b/libfcgi/os_unix.c
@@ -42,6 +42,7 @@ static const char rcsid[] = "$Id: os_unix.c,v 1.37 2002/03/05 19:14:49 robs Exp
#include <sys/time.h>
#include <sys/un.h>
#include <signal.h>
+#include <poll.h>
#ifdef HAVE_NETDB_H
#include <netdb.h>
@@ -103,6 +104,9 @@ static int volatile maxFd = -1;
static int shutdownPending = FALSE;
static int shutdownNow = FALSE;
+static int libfcgiOsClosePollTimeout = 2000;
+static int libfcgiIsAfUnixKeeperPollTimeout = 2000;
+
void OS_ShutdownPending()
{
shutdownPending = TRUE;
@@ -168,6 +172,16 @@ int OS_LibInit(int stdioFds[3])
if(libInitialized)
return 0;
+ char *libfcgiOsClosePollTimeoutStr = getenv( "LIBFCGI_OS_CLOSE_POLL_TIMEOUT" );
+ if(libfcgiOsClosePollTimeoutStr) {
+ libfcgiOsClosePollTimeout = atoi(libfcgiOsClosePollTimeoutStr);
+ }
+
+ char *libfcgiIsAfUnixKeeperPollTimeoutStr = getenv( "LIBFCGI_IS_AF_UNIX_KEEPER_POLL_TIMEOUT" );
+ if(libfcgiIsAfUnixKeeperPollTimeoutStr) {
+ libfcgiIsAfUnixKeeperPollTimeout = atoi(libfcgiIsAfUnixKeeperPollTimeoutStr);
+ }
+
asyncIoTable = (AioInfo *)malloc(asyncIoTableSize * sizeof(AioInfo));
if(asyncIoTable == NULL) {
errno = ENOMEM;
@@ -755,19 +769,16 @@ int OS_Close(int fd)
if (shutdown(fd, 1) == 0)
{
- struct timeval tv;
- fd_set rfds;
+ struct pollfd pfd;
int rv;
char trash[1024];
- FD_ZERO(&rfds);
+ pfd.fd = fd;
+ pfd.events = POLLIN;
do
{
- FD_SET(fd, &rfds);
- tv.tv_sec = 2;
- tv.tv_usec = 0;
- rv = select(fd + 1, &rfds, NULL, NULL, &tv);
+ rv = poll(&pfd, 1, libfcgiOsClosePollTimeout);
}
while (rv > 0 && read(fd, trash, sizeof(trash)) > 0);
}
@@ -1116,13 +1127,11 @@ static int is_reasonable_accept_errno (const int error)
*/
static int is_af_unix_keeper(const int fd)
{
- struct timeval tval = { READABLE_UNIX_FD_DROP_DEAD_TIMEVAL };
- fd_set read_fds;
-
- FD_ZERO(&read_fds);
- FD_SET(fd, &read_fds);
+ struct pollfd pfd;
+ pfd.fd = fd;
+ pfd.events = POLLIN;
- return select(fd + 1, &read_fds, NULL, NULL, &tval) >= 0 && FD_ISSET(fd, &read_fds);
+ return poll(&pfd, 1, libfcgiIsAfUnixKeeperPollTimeout) >= 0 && (pfd.revents & POLLIN);
}
/*
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