From 9999e48639b3cecb08ffb37358bcba3b48161b29 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 08:50:17 +0000
Subject: [PATCH] add ax88772_rst
---
kernel/Documentation/userspace-api/spec_ctrl.rst | 27 +++++++++++++++------------
1 files changed, 15 insertions(+), 12 deletions(-)
diff --git a/kernel/Documentation/userspace-api/spec_ctrl.rst b/kernel/Documentation/userspace-api/spec_ctrl.rst
index 0fda8f6..7ddd8f6 100644
--- a/kernel/Documentation/userspace-api/spec_ctrl.rst
+++ b/kernel/Documentation/userspace-api/spec_ctrl.rst
@@ -28,18 +28,20 @@
which is selected with arg2 of prctl(2). The return value uses bits 0-3 with
the following meaning:
-==== ===================== ===================================================
-Bit Define Description
-==== ===================== ===================================================
-0 PR_SPEC_PRCTL Mitigation can be controlled per task by
- PR_SET_SPECULATION_CTRL.
-1 PR_SPEC_ENABLE The speculation feature is enabled, mitigation is
- disabled.
-2 PR_SPEC_DISABLE The speculation feature is disabled, mitigation is
- enabled.
-3 PR_SPEC_FORCE_DISABLE Same as PR_SPEC_DISABLE, but cannot be undone. A
- subsequent prctl(..., PR_SPEC_ENABLE) will fail.
-==== ===================== ===================================================
+==== ====================== ==================================================
+Bit Define Description
+==== ====================== ==================================================
+0 PR_SPEC_PRCTL Mitigation can be controlled per task by
+ PR_SET_SPECULATION_CTRL.
+1 PR_SPEC_ENABLE The speculation feature is enabled, mitigation is
+ disabled.
+2 PR_SPEC_DISABLE The speculation feature is disabled, mitigation is
+ enabled.
+3 PR_SPEC_FORCE_DISABLE Same as PR_SPEC_DISABLE, but cannot be undone. A
+ subsequent prctl(..., PR_SPEC_ENABLE) will fail.
+4 PR_SPEC_DISABLE_NOEXEC Same as PR_SPEC_DISABLE, but the state will be
+ cleared on :manpage:`execve(2)`.
+==== ====================== ==================================================
If all bits are 0 the CPU is not affected by the speculation misfeature.
@@ -94,6 +96,7 @@
* prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_STORE_BYPASS, PR_SPEC_ENABLE, 0, 0);
* prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_STORE_BYPASS, PR_SPEC_DISABLE, 0, 0);
* prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_STORE_BYPASS, PR_SPEC_FORCE_DISABLE, 0, 0);
+ * prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_STORE_BYPASS, PR_SPEC_DISABLE_NOEXEC, 0, 0);
- PR_SPEC_INDIR_BRANCH: Indirect Branch Speculation in User Processes
(Mitigate Spectre V2 style attacks against user processes)
--
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