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