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Open Source and information security mailing list archives
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Date: Tue, 8 Dec 2020 17:57:29 -0800 (PST) From: James Morris <jmorris@...ei.org> To: Miklos Szeredi <mszeredi@...hat.com> cc: "Eric W . Biederman" <ebiederm@...ssion.com>, linux-fsdevel@...r.kernel.org, linux-unionfs@...r.kernel.org, linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org, Dmitry Vyukov <dvyukov@...gle.com> Subject: Re: [PATCH v2 04/10] ovl: make ioctl() safe On Mon, 7 Dec 2020, Miklos Szeredi wrote: > ovl_ioctl_set_flags() does a capability check using flags, but then the > real ioctl double-fetches flags and uses potentially different value. > > The "Check the capability before cred override" comment misleading: user > can skip this check by presenting benign flags first and then overwriting > them to non-benign flags. Is this a security bug which should be fixed in stable? -- James Morris <jmorris@...ei.org>
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