Description of problem:

When pam_mysql module is eanbled in /etc/pam.d/vsftpd, authentication fails with the message "libgcc_s.so.1 must be installed for pthread_cancel to work".

Version-Release number of selected component (if applicable):

vsftpd-3.0.2-1.fc18.x86_64


How reproducible:


Steps to Reproduce:
1. yum install vsftpd
2. use the following /etc/vsftpd/vsftpd.conf contents:

anonymous_enable=YES
local_enable=YES
write_enable=YES
local_umask=022
dirmessage_enable=YES
xferlog_enable=YES
connect_from_port_20=YES
xferlog_std_format=YES
listen=NO
listen_ipv6=YES

pam_service_name=vsftpd
userlist_enable=YES
tcp_wrappers=YES


3. use the following /etc/pam.d/vsftpd contents:
#%PAM-1.0
auth       required     pam_listfile.so item=user sense=deny file=/etc/vsftpd/ftpusers onerr=succeed
auth required pam_mysql.so user=vsftpd passwd=qwerty host=localhost db=vsftpd table=accounts usercolumn=user passwdcolumn=password crypt=2
account required pam_mysql.so user=vsftpd passwd=qwerty host=localhost db=vsftpd table=accounts usercolumn=user passwdcolumn=password crypt=2


4. create mysql database and test user:

create database vsftpd;
grant select on vsftpd.* to 'vsftpd'@'localhost' identified by 'qwerty';
create table accounts (id int not null auto_increment,user varchar(64) not null,password varchar(64) not null,primary key (id));
insert into accounts (user,password) values ('test',PASSWORD('test'));

5. let pam interact with mysql by modyfying selinux policies
6. start vsftpd service
7. try to ftp to localhost


Actual results:
Connected to localhost (127.0.0.1).
220 (vsFTPd 3.0.2)
Name (localhost:user): test
331 Please specify the password.
Password:
libgcc_s.so.1 must be installed for pthread_cancel to work
Login failed.


Expected results:

Connected to localhost (127.0.0.1).
220 (vsFTPd 3.0.2)
Name (localhost:user): test
331 Please specify the password.
Password:
230 Login successful.
Remote system type is UNIX.
Using binary mode to transfer files.


Additional info:
The problem is caused by too low value of VSFTP_AS_LIMIT in file defs.h. The patch vsftpd-2.3.5-aslim.patch increases it from "100UL * 1024 * 1024" to "200UL * 1024 * 1024", but it is still not enough. After setting it to "400UL * 1024 * 1024" vsftpd works like expected.

I have seen the same report on Ubuntu bugtracker.