linux-kernel - Re: [PATCH] fs/pidfs: when time ns disabled add check for ioctl

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Message-ID: <Zpzp-NO6dyRhcqmH@casper.infradead.org>
Date: Sun, 21 Jul 2024 11:59:04 +0100
From: Matthew Wilcox <willy@...radead.org>
To: Edward Adam Davis <eadavis@...com>
Cc: syzbot+34a0ee986f61f15da35d@...kaller.appspotmail.com,
	brauner@...nel.org, jack@...e.cz, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
	viro@...iv.linux.org.uk
Subject: Re: [PATCH] fs/pidfs: when time ns disabled add check for ioctl

On Sun, Jul 21, 2024 at 02:23:12PM +0800, Edward Adam Davis wrote:
> syzbot call pidfd_ioctl() with cmd "PIDFD_GET_TIME_NAMESPACE" and disabled
> CONFIG_TIME_NS, since time_ns is NULL, it will make NULL ponter deref in
> open_namespace.

what about PIDFD_GET_TIME_FOR_CHILDREN_NAMESPACE?