Public bug reported:
I'm running Ubuntu 12.04 in a VM. After a recent kernel upgrade, I'm
finding that I can reliably put the system in a position where the
inotify_init() syscall returns -EMFILE, but /proc/*/fd shows fewer
"anon_inode:inotify" entries than
/proc/sys/fs/inotify/max_user_instances. Unfortunately the only way I
know how to reproduce this is to run some internal Python unit tests
that exercise pyinotify. But after a few such invokations, there appears
to be a leak.
Perhaps a regression of CVE-2010-4250?
adar@adar-dev:~$ for foo in /proc/*/fd/*; do readlink -f $foo; done | grep
inotify | sort | wc -l
24
adar@adar-dev:~$ cat /proc/sys/fs/inotify/max_user_instances
128
adar@adar-dev:~$ cat inotify_test.c
#include <stdio.h>
#include <sys/inotify.h>
void main(int argc, char *argv[]) {
int err = inotify_init();
if (err == -1) {
perror("inotify_init");
}
}
adar@adar-dev:~$ gcc inotify_test.c -o inotify_test
adar@adar-dev:~$ ./inotify_test
inotify_init: Too many open files
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "lspci-vnvn.log"
https://bugs.launchpad.net/bugs/1101666/+attachment/3488365/+files/lspci-vnvn.log
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https://bugs.launchpad.net/bugs/1101666
Title:
inotify fd leak
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