oss-sec mailing list archives
Re: Re: CVE request Linux kernel: ns: user namespaces panic
From: ebiederm () xmission com (Eric W. Biederman)
Date: Fri, 05 Jun 2015 12:31:23 -0500
P J P <ppandit () redhat com> writes:
+-- On Thu, 4 Jun 2015, cve-assign () mitre org wrote --+ | >> From: ebiederm () xmission com (Eric W. Biederman) | >> | >> The core issue is that a unprivileged user could call umount(MNT_DETACH) | >> and in the right circumstances gain access to every file on essentially | >> any filesystem in the mount namespace. | >> | >> e0c9c0afd2fc958ffa34b697972721d81df8a56f mnt: Update detach_mounts to leave mounts connected | >> is the real bug fix that fixes a fairly scary issue. | >> | >> So I believe cd4a40174b71acd021877341684d8bb1dc8ea4ae prevents a | >> difficult to trigger crash if you have | >> e0c9c0afd2fc958ffa34b697972721d81df8a56f applied. | >> | | Use CVE-2015-4176 for the issue fixed in | e0c9c0afd2fc958ffa34b697972721d81df8a56f . This code change is present | in 4.0.2. | | Use CVE-2015-4177 for the issue fixed in | cd4a40174b71acd021877341684d8bb1dc8ea4ae. This code change is not | present in 4.0.2. Ie IIUC, existence of CVE-2015-4177 depends on CVE-2015-4176 being fixed, which in turn depends on commit -> https://git.kernel.org/linus/ce07d891a0891d3c0d0c2d73d577490486b809e1 being present. (...Eric?)
There are no dependencies between e0c9c0afd2fc958ffa34b697972721d81df8a56f and cd4a40174b71acd021877341684d8bb1dc8ea4ae Neither commit (cec9c... or cd4a4017...) missing is a problem unless ce07d891a0891d3c0d0c2d73d577490486b809e1 is present. Commits (cec9c... and cd4a4017...) are harmless on their own. I hope that clarifies things. Eric
Current thread:
- CVE request Linux kernel: ns: user namespaces panic P J P (May 29)
- Re: CVE request Linux kernel: ns: user namespaces panic Andy Lutomirski (May 29)
- Re: CVE request Linux kernel: ns: user namespaces panic cve-assign (Jun 03)
- Re: Re: CVE request Linux kernel: ns: user namespaces panic P J P (Jun 03)
- Re: Re: CVE request Linux kernel: ns: user namespaces panic Eric W. Biederman (Jun 04)
- Re: Re: CVE request Linux kernel: ns: user namespaces panic P J P (Jun 04)
- Re: CVE request Linux kernel: ns: user namespaces panic cve-assign (Jun 04)
- Re: Re: CVE request Linux kernel: ns: user namespaces panic P J P (Jun 05)
- Re: Re: CVE request Linux kernel: ns: user namespaces panic Eric W. Biederman (Jun 05)
- Re: Re: CVE request Linux kernel: ns: user namespaces panic P J P (Jun 07)
- Re: Re: CVE request Linux kernel: ns: user namespaces panic Eric W. Biederman (Jun 07)
- Re: Re: CVE request Linux kernel: ns: user namespaces panic P J P (Jun 07)
- Re: Re: CVE request Linux kernel: ns: user namespaces panic P J P (Jun 03)