https://bugzilla.mindrot.org/show_bug.cgi?id=2167
Bug ID: 2167
Summary: Connection remains when fork() fails.
Product: Portable OpenSSH
Version: 5.3p1
Hardware: Other
OS: Linux
Status: NEW
Severity: enhancement
Priority: P5
Component: sshd
Assignee: [email protected]
Reporter: [email protected]
Created attachment 2368
--> https://bugzilla.mindrot.org/attachment.cgi?id=2368&action=edit
A patch which seems to solve this problem.
I got "sshd[$pid]: fatal: fork of unprivileged child failed" in
/var/log/secure but the connection with ssh client remained.
I examined the cause and found that this problem happens when fork() in
privsep_preauth()/privsep_postauth() fails. You can easily reproduce
this problem by replacing fork() in
privsep_preauth()/privsep_postauth()
with -1.
I don't know what is the right fix, but at least forcibly closing
all sockets before exit() seems to solve this problem.
I'm using RHEL 6.4's openssh-5.3p1-84.1.el6.src.rpm , but I think
this problem exists in any versions which have
privsep_preauth()/privsep_postauth() .
Regards.
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