Public bug reported:
[Impact]
When running in a multithreaded environment each pthread that opens the
/var/lib/sss/pipes/nss socket retaind the file descriptor in a thread
specific structure. This file descriptor should be closed when the
thread is destroyed but due to a bug it is left open thus generating the
leak.
[Test Plan]
This code generates many threads that open the mentioned socket.
#include <pwd.h>
#include <unistd.h>
#include <pthread.h>
static void *client(void *arg)
{
int i = *((int *)arg);
struct passwd pwd;
char buf[10000];
struct passwd *r;
getpwuid_r(i, &pwd, buf, 10000, &r);
return NULL;
}
int main(void)
{
pthread_t thread;
int arg;
void *t_ret;
for (int i = 0; i < 1000; ++i) {
arg = 100000+i;
pthread_create(&thread, NULL, client, &arg);
pthread_join(thread, &t_ret);
}
while (1) {
sleep(1);
}
return 0;
}
The file descriptor leak problem can be tested by running
lsof -p `pidof test_code` | wc -l
The count can reach more than a thousand when should not be bigger than
around 20 normally.
[Where problems could occur]
The patched correctly accesses the thread specific structure to get the
file descriptor and close the socket. Previously it just considered the
structure was null and did nothing. The only new problems that could
occur are related to the closing of the socket but that would be not
worse than the previous situation.
[Other Info]
This bug only affects Noble
** Affects: sssd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2085389
Title:
File descriptor leak on /var/lib/sss/pipes/nss socket
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