147 lines
5.6 KiB
Diff
147 lines
5.6 KiB
Diff
From 32ecdb4e8ccccf07acd8c6c82a3676ec15647b4a Mon Sep 17 00:00:00 2001
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From: Vojtech Polasek <vpolasek@redhat.com>
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Date: Wed, 16 Feb 2022 14:02:45 +0100
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Subject: [PATCH 1/3] add grub2 variant
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---
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.../rule.yml | 40 +++++++++++++++++++
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2 files changed, 40 insertions(+), 1 deletion(-)
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create mode 100644 linux_os/guide/system/bootloader-grub2/grub2_page_alloc_shuffle_argument/rule.yml
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diff --git a/linux_os/guide/system/bootloader-grub2/grub2_page_alloc_shuffle_argument/rule.yml b/linux_os/guide/system/bootloader-grub2/grub2_page_alloc_shuffle_argument/rule.yml
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new file mode 100644
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index 00000000000..3d0c8b95d8a
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--- /dev/null
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+++ b/linux_os/guide/system/bootloader-grub2/grub2_page_alloc_shuffle_argument/rule.yml
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@@ -0,0 +1,40 @@
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+documentation_complete: true
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+
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+prodtype: rhel9
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+
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+title: 'Enable randomization of the page allocator'
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+
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+description: |-
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+ To enable randomization of the page allocator in the kernel, add the
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+ <tt>page_alloc.shuffle=1</tt> argument to the default GRUB 2 command line.
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+ {{{ describe_grub2_argument("page_alloc.shuffle=1") | indent(4) }}}
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+
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+rationale: |-
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+ The <tt>CONFIG_SHUFFLE_PAGE_ALLOCATOR</tt> config option is primarily
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+ focused on improving the average utilization of a direct-mapped
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+ memory-side-cache. Aside of this performance effect, it also reduces
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+ predictability of page allocations in situations when the bad actor can
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+ crash the system and somehow leverage knowledge of (page) allocation order
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+ right after a fresh reboot, or can control the timing between a
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+ hot-pluggable memory node (as in NUMA node) and applications allocating
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+ memory ouf of that node. The <tt>page_alloc.shuffle=1</tt> kernel command
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+ line parameter then forces this functionality irrespectively of memory cache
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+ architecture.
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+
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+severity: medium
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+
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+identifiers:
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+ cce@rhel9: CCE-85879-5
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+
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+ocil_clause: 'randomization of the page allocator is not enabled in the kernel'
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+
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+ocil: |-
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+ {{{ ocil_grub2_argument("page_alloc.shuffle=1") | indent(4) }}}
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+
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+platform: machine
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+
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+template:
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+ name: grub2_bootloader_argument
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+ vars:
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+ arg_name: page_alloc.shuffle
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+ arg_value: '1'
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From ccd4bee3bec201cdee883c662056fc408b2d88ad Mon Sep 17 00:00:00 2001
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From: Vojtech Polasek <vpolasek@redhat.com>
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Date: Wed, 16 Feb 2022 14:20:59 +0100
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Subject: [PATCH 2/3] add zipl variant
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---
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.../zipl_page_alloc_shuffle_argument/rule.yml | 46 +++++++++++++++++++
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2 files changed, 46 insertions(+), 1 deletion(-)
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create mode 100644 linux_os/guide/system/bootloader-zipl/zipl_page_alloc_shuffle_argument/rule.yml
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diff --git a/linux_os/guide/system/bootloader-zipl/zipl_page_alloc_shuffle_argument/rule.yml b/linux_os/guide/system/bootloader-zipl/zipl_page_alloc_shuffle_argument/rule.yml
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new file mode 100644
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index 00000000000..5179b19fcc0
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--- /dev/null
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+++ b/linux_os/guide/system/bootloader-zipl/zipl_page_alloc_shuffle_argument/rule.yml
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@@ -0,0 +1,46 @@
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+documentation_complete: true
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+
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+prodtype: rhel9
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+
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+title: 'Enable randomization of the page allocator in zIPL'
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+
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+description: |-
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+ To enable the randomization of the page allocator in the kernel, check that
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+ all boot entries in <tt>/boot/loader/entries/*.conf</tt> have
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+ <tt>page_alloc.shuffle=1</tt> included in its options.<br />
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+
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+ To enable randomization of the page allocator also for newly installed
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+ kernels, add <tt>page_alloc.shuffle=1</tt> to <tt>/etc/kernel/cmdline</tt>.
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+
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+rationale: |-
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+ The <tt>CONFIG_SHUFFLE_PAGE_ALLOCATOR</tt> config option is primarily
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+ focused on improving the average utilization of a direct-mapped
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+ memory-side-cache. Aside of this performance effect, it also reduces
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+ predictability of page allocations in situations when the bad actor can
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+ crash the system and somehow leverage knowledge of (page) allocation order
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+ right after a fresh reboot, or can control the timing between a
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+ hot-pluggable memory node (as in NUMA node) and applications allocating
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+ memory ouf of that node. The <tt>page_alloc.shuffle=1</tt> kernel command
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+ line parameter then forces this functionality irrespectively of memory cache
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+ architecture.
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+
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+severity: medium
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+
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+identifiers:
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+ cce@rhel9: CCE-85880-3
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+
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+ocil_clause: 'randomization of the page allocator is not enabled in the kernel'
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+
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+ocil: |-
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+ To check that the randomization of the page allocator in the kernel is
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+ enabled, check all boot entries with following command:
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+ <pre>sudo grep -L"^options\s+.*\bpage_alloc\.shuffle=1\b" /boot/loader/entries/*.conf</pre>
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+ No line should be returned, each line returned is a boot entry that doesn't enable audit.
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+
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+platform: machine
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+
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+template:
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+ name: zipl_bls_entries_option
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+ vars:
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+ arg_name: page_alloc.shuffle
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+ arg_value: '1'
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From 89671b0a5a69ccaf0a46ff1fc86db82fc822dda0 Mon Sep 17 00:00:00 2001
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From: Vojtech Polasek <vpolasek@redhat.com>
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Date: Wed, 16 Feb 2022 14:24:32 +0100
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Subject: [PATCH 3/3] add rules to rhel9 ospp profile
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---
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products/rhel9/profiles/ospp.profile | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/products/rhel9/profiles/ospp.profile b/products/rhel9/profiles/ospp.profile
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index f25abd7e4c4..4bdf8d98b97 100644
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--- a/products/rhel9/profiles/ospp.profile
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+++ b/products/rhel9/profiles/ospp.profile
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@@ -126,6 +126,7 @@ selections:
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- grub2_audit_backlog_limit_argument
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- grub2_vsyscall_argument
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- grub2_init_on_alloc_argument
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+ - grub2_page_alloc_shuffle_argument
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## Security Settings
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- sysctl_kernel_kptr_restrict
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@@ -409,3 +410,4 @@ selections:
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- zipl_audit_backlog_limit_argument
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- zipl_vsyscall_argument
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- zipl_init_on_alloc_argument
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+ - zipl_page_alloc_shuffle_argument
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