linux-kernel - [PATCH 1/3] mm: security: Move hardened usercopy under 'Kernel hardening options'

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Message-ID: <20250117130337.4716-2-mgorman@techsingularity.net>
Date: Fri, 17 Jan 2025 13:03:35 +0000
From: Mel Gorman <mgorman@...hsingularity.net>
To: Kees Cook <kees@...nel.org>
Cc: Daniel Micay <danielmicay@...il.com>,
	linux-hardening@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Mel Gorman <mgorman@...hsingularity.net>
Subject: [PATCH 1/3] mm: security: Move hardened usercopy under 'Kernel hardening options'

There is a submenu for 'Kernel hardening options' under "Security".
Move HARDENED_USERCOPY under the hardening options as it is clearly
related.

Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
---
 security/Kconfig           | 12 ------------
 security/Kconfig.hardening | 16 ++++++++++++++++
 2 files changed, 16 insertions(+), 12 deletions(-)

diff --git a/security/Kconfig b/security/Kconfig
index 28e685f53bd1..fe7346dc4bc3 100644
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -159,18 +159,6 @@ config LSM_MMAP_MIN_ADDR
 	  this low address space will need the permission specific to the
 	  systems running LSM.
 
-config HARDENED_USERCOPY
-	bool "Harden memory copies between kernel and userspace"
-	imply STRICT_DEVMEM
-	help
-	  This option checks for obviously wrong memory regions when
-	  copying memory to/from the kernel (via copy_to_user() and
-	  copy_from_user() functions) by rejecting memory ranges that
-	  are larger than the specified heap object, span multiple
-	  separately allocated pages, are not on the process stack,
-	  or are part of the kernel text. This prevents entire classes
-	  of heap overflow exploits and similar kernel memory exposures.
-
 config FORTIFY_SOURCE
 	bool "Harden common str/mem functions against buffer overflows"
 	depends on ARCH_HAS_FORTIFY_SOURCE
diff --git a/security/Kconfig.hardening b/security/Kconfig.hardening
index c9d5ca3d8d08..00e6e2ed0c43 100644
--- a/security/Kconfig.hardening
+++ b/security/Kconfig.hardening
@@ -279,6 +279,22 @@ config ZERO_CALL_USED_REGS
 
 endmenu
 
+menu "String manipulation"
+
+config HARDENED_USERCOPY
+	bool "Harden memory copies between kernel and userspace"
+	imply STRICT_DEVMEM
+	help
+	  This option checks for obviously wrong memory regions when
+	  copying memory to/from the kernel (via copy_to_user() and
+	  copy_from_user() functions) by rejecting memory ranges that
+	  are larger than the specified heap object, span multiple
+	  separately allocated pages, are not on the process stack,
+	  or are part of the kernel text. This prevents entire classes
+	  of heap overflow exploits and similar kernel memory exposures.
+
+endmenu
+
 menu "Hardening of kernel data structures"
 
 config LIST_HARDENED
-- 
2.43.0