Public bug reported: 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. ** Affects: linux (Ubuntu) Importance: Undecided Status: Incomplete ** Tags: bionic ** Attachment added: "lspci-vnvn.log" https://bugs.launchpad.net/bugs/1813179/+attachment/5232254/+files/lspci-vnvn.log ** Description changed: 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 -EACCESS (Permission denied) error even though it is a + 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. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1813179/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
