|
 |
bd689f |
From 1e65a0a15f819b8bf1b551bd84f71d0da1f5a00c Mon Sep 17 00:00:00 2001
|
|
|
bd689f |
From: Martin Sehnoutka <msehnout@redhat.com>
|
|
|
bd689f |
Date: Thu, 17 Nov 2016 13:02:27 +0100
|
|
|
bd689f |
Subject: [PATCH 26/59] Prevent hanging in SIGCHLD handler.
|
|
|
bd689f |
|
|
|
bd689f |
vsftpd can now handle pam_exec.so in pam.d config without hanging
|
|
|
bd689f |
in SIGCHLD handler.
|
|
|
bd689f |
---
|
|
|
bd689f |
sysutil.c | 4 ++--
|
|
|
bd689f |
sysutil.h | 2 +-
|
|
|
bd689f |
twoprocess.c | 13 +++++++++++--
|
|
|
bd689f |
3 files changed, 14 insertions(+), 5 deletions(-)
|
|
|
bd689f |
|
|
|
bd689f |
diff --git a/sysutil.c b/sysutil.c
|
|
|
bd689f |
index 6d7cb3f..099748f 100644
|
|
|
bd689f |
--- a/sysutil.c
|
|
|
bd689f |
+++ b/sysutil.c
|
|
|
bd689f |
@@ -608,13 +608,13 @@ vsf_sysutil_exit(int exit_code)
|
|
|
bd689f |
}
|
|
|
bd689f |
|
|
|
bd689f |
struct vsf_sysutil_wait_retval
|
|
|
bd689f |
-vsf_sysutil_wait(void)
|
|
|
bd689f |
+vsf_sysutil_wait(int hang)
|
|
|
bd689f |
{
|
|
|
bd689f |
struct vsf_sysutil_wait_retval retval;
|
|
|
bd689f |
vsf_sysutil_memclr(&retval, sizeof(retval));
|
|
|
bd689f |
while (1)
|
|
|
bd689f |
{
|
|
|
bd689f |
- int sys_ret = wait(&retval.exit_status);
|
|
|
bd689f |
+ int sys_ret = waitpid(-1, &retval.exit_status, hang ? 0 : WNOHANG);
|
|
|
bd689f |
if (sys_ret < 0 && errno == EINTR)
|
|
|
bd689f |
{
|
|
|
bd689f |
vsf_sysutil_check_pending_actions(kVSFSysUtilUnknown, 0, 0);
|
|
|
bd689f |
diff --git a/sysutil.h b/sysutil.h
|
|
|
bd689f |
index c145bdf..13153cd 100644
|
|
|
bd689f |
--- a/sysutil.h
|
|
|
bd689f |
+++ b/sysutil.h
|
|
|
bd689f |
@@ -177,7 +177,7 @@ struct vsf_sysutil_wait_retval
|
|
|
bd689f |
int PRIVATE_HANDS_OFF_syscall_retval;
|
|
|
bd689f |
int PRIVATE_HANDS_OFF_exit_status;
|
|
|
bd689f |
};
|
|
|
bd689f |
-struct vsf_sysutil_wait_retval vsf_sysutil_wait(void);
|
|
|
bd689f |
+struct vsf_sysutil_wait_retval vsf_sysutil_wait(int hang);
|
|
|
bd689f |
int vsf_sysutil_wait_reap_one(void);
|
|
|
bd689f |
int vsf_sysutil_wait_get_retval(
|
|
|
bd689f |
const struct vsf_sysutil_wait_retval* p_waitret);
|
|
|
bd689f |
diff --git a/twoprocess.c b/twoprocess.c
|
|
|
bd689f |
index 33d84dc..b1891e7 100644
|
|
|
bd689f |
--- a/twoprocess.c
|
|
|
bd689f |
+++ b/twoprocess.c
|
|
|
bd689f |
@@ -47,8 +47,17 @@ static void
|
|
|
bd689f |
handle_sigchld(void* duff)
|
|
|
bd689f |
{
|
|
|
bd689f |
|
|
|
bd689f |
- struct vsf_sysutil_wait_retval wait_retval = vsf_sysutil_wait();
|
|
|
bd689f |
+ struct vsf_sysutil_wait_retval wait_retval = vsf_sysutil_wait(0);
|
|
|
bd689f |
(void) duff;
|
|
|
bd689f |
+ if (!vsf_sysutil_wait_get_exitcode(&wait_retval) &&
|
|
|
bd689f |
+ !vsf_sysutil_wait_get_retval(&wait_retval))
|
|
|
bd689f |
+ /* There was nobody to wait for, possibly caused by underlying library
|
|
|
bd689f |
+ * which created a new process through fork()/vfork() and already picked
|
|
|
bd689f |
+ * it up, e.g. by pam_exec.so or integrity check routines for libraries
|
|
|
bd689f |
+ * when FIPS mode is on (nss freebl), which can lead to calling prelink
|
|
|
bd689f |
+ * if the prelink package is installed.
|
|
|
bd689f |
+ */
|
|
|
bd689f |
+ return;
|
|
|
bd689f |
/* Child died, so we'll do the same! Report it as an error unless the child
|
|
|
bd689f |
* exited normally with zero exit code
|
|
|
bd689f |
*/
|
|
|
bd689f |
@@ -390,7 +399,7 @@ common_do_login(struct vsf_session* p_sess, const struct mystr* p_user_str,
|
|
|
bd689f |
priv_sock_send_result(p_sess->parent_fd, PRIV_SOCK_RESULT_OK);
|
|
|
bd689f |
if (!p_sess->control_use_ssl)
|
|
|
bd689f |
{
|
|
|
bd689f |
- (void) vsf_sysutil_wait();
|
|
|
bd689f |
+ (void) vsf_sysutil_wait(1);
|
|
|
bd689f |
}
|
|
|
bd689f |
else
|
|
|
bd689f |
{
|
|
|
bd689f |
--
|
|
|
bd689f |
2.14.4
|
|
|
bd689f |
|