This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1813179
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Tags added: bionic
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https://bugs.launchpad.net/bugs/1813179
Title:
Bionic (4.15.0-43.46), x86: mprotect(..., PROT_NONE) failure for
VM_PFNMAP VMAs (fixed in mainline)
Status in linux package in Ubuntu:
Confirmed
Bug description:
Version:
Distributor ID: Ubuntu
Description: Ubuntu 18.04.1 LTS
Release: 18.04
Codename: bionic
Ubuntu 4.15.0-43.46-generic 4.15.18
This is a bug that has been fixed in mainline. When calling
'mprotect(..., PROT_NONE)' on a virtual memory area with VM_PFNMAP set
it fails with a EACCESS (Permission denied) error even though it is a
valid call. In my particular case this happens when calling
mprotect(..., PROT_NONE) on a set of pages within the range of an
Intel SGX enclave.
The bug is fully described on the Linux kernel mailing list here:
https://lkml.org/lkml/2018/8/16/697
The bug has been fixed in mainline in August, see
https://github.com/torvalds/linux/commit/f19f5c49bbc3ffcc9126cc245fc1b24cc29f4a37
According to https://launchpad.net/ubuntu/+source/linux/+changelog the
patch has been backported to Xenial and Cosmic, but not yet to Bionic.
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