linux-kernel - [PATCH 4/4] arm64: mm: use ARCH_HAS_DEBUG

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <e19709e7576f65e303245fe520cad5f7bae72763.1587455584.git.zong.li@sifive.com>
Date:   Tue, 21 Apr 2020 16:17:15 +0800
From:   Zong Li <zong.li@...ive.com>
To:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, paul.walmsley@...ive.com,
        palmer@...belt.com, linux-riscv@...ts.infradead.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, x86@...nel.org,
        hpa@...or.com, catalin.marinas@....com, will@...nel.org,
        linux-arm-kernel@...ts.infradead.org
Cc:     Zong Li <zong.li@...ive.com>
Subject: [PATCH 4/4] arm64: mm: use ARCH_HAS_DEBUG_WX instead of arch defined

Extract DEBUG_WX to mm/Kconfig.debug for shared use. Change to use
ARCH_HAS_DEBUG_WX instead of DEBUG_WX defined by arch port.

Signed-off-by: Zong Li <zong.li@...ive.com>
---
 arch/arm64/Kconfig       |  1 +
 arch/arm64/Kconfig.debug | 29 -----------------------------
 2 files changed, 1 insertion(+), 29 deletions(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 40fb05d96c60..a16e2ce80854 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -9,6 +9,7 @@ config ARM64
 	select ACPI_MCFG if (ACPI && PCI)
 	select ACPI_SPCR_TABLE if ACPI
 	select ACPI_PPTT if ACPI
+	select ARCH_HAS_DEBUG_WX
 	select ARCH_HAS_DEBUG_VIRTUAL
 	select ARCH_HAS_DEVMEM_IS_ALLOWED
 	select ARCH_HAS_DMA_PREP_COHERENT
diff --git a/arch/arm64/Kconfig.debug b/arch/arm64/Kconfig.debug
index a1efa246c9ed..cdf7ec0b975e 100644
--- a/arch/arm64/Kconfig.debug
+++ b/arch/arm64/Kconfig.debug
@@ -23,35 +23,6 @@ config ARM64_RANDOMIZE_TEXT_OFFSET
 	  of TEXT_OFFSET and platforms must not require a specific
 	  value.
 
-config DEBUG_WX
-	bool "Warn on W+X mappings at boot"
-	select PTDUMP_CORE
-	---help---
-	  Generate a warning if any W+X mappings are found at boot.
-
-	  This is useful for discovering cases where the kernel is leaving
-	  W+X mappings after applying NX, as such mappings are a security risk.
-	  This check also includes UXN, which should be set on all kernel
-	  mappings.
-
-	  Look for a message in dmesg output like this:
-
-	    arm64/mm: Checked W+X mappings: passed, no W+X pages found.
-
-	  or like this, if the check failed:
-
-	    arm64/mm: Checked W+X mappings: FAILED, <N> W+X pages found.
-
-	  Note that even if the check fails, your kernel is possibly
-	  still fine, as W+X mappings are not a security hole in
-	  themselves, what they do is that they make the exploitation
-	  of other unfixed kernel bugs easier.
-
-	  There is no runtime or memory usage effect of this option
-	  once the kernel has booted up - it's a one time check.
-
-	  If in doubt, say "Y".
-
 config DEBUG_EFI
 	depends on EFI && DEBUG_INFO
 	bool "UEFI debugging"
-- 
2.26.1