Date: Wed, 22 May 2019 18:31:25 +0200 From: Greg KH <greg@...ah.com> To: oss-security@...ts.openwall.com Subject: Re: CVE-2019-10142 linux kernel: integer overflow in ioctl handling of fsl hypervisor On Thu, May 23, 2019 at 12:52:17AM +1000, Wade Mealing wrote: > Gday, > > >From the upstream git commit: > > "The "param.count" value is a u64 that comes from the user. The code later > in the function assumes that param.count is at least one and if it's not > then it leads to an Oops when we dereference the ZERO_SIZE_PTR. Also the > addition can have an integer overflow which would lead us to allocate a > smaller "pages" array than required. I can't immediately tell what the > possible run times implications are, but it's safest to prevent the > overflow." > > At this time Red Hat products are not affected this code is not built as > the CONFIG_FSL_HV_MANAGER build option is not enabled by default. Device > (/dev/fsl-hv) ownership and permissions which prevent unprivileged users > from being able to exploit this without some elevated permissions (I think > this will default to user: root group:root with 0660 mask) however some > Linux distributions may use udev to set this to non root ownership or > another group. In the default configuration, a user who is sufficiently > privileged to exploit this is likely able to attack the system without it. > > I open the discussion and note the CVE listed above for discussions that > may reference this patch and perhaps save someone some time in > investigation. > > Red Hat bugzilla: > https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-10142 > > Upstream fix: > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6a024330650e24556b8a18cc654ad00cfecf6c6c Note, this fix is in the following released stable kernels at this point in time: 3.18.140 4.4.180 4.9.177 4.14.120 4.19.44 5.0.17 5.1.3 Also, to let oss-security know, the 3.18.y kernel tree is now really end-of-life on kernel.org, but if people care about it still, they can follow the android-common 3.18 branch as it will continue to get security updates for at least the rest of this year, if not maybe a bit longer. thanks, greg k-h
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