The patch titled
Subject: mm: add DEBUG_WX support
has been removed from the -mm tree. Its filename was
mm-add-debug_wx-support.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Zong Li <zong.li@xxxxxxxxxx>
Subject: mm: add DEBUG_WX support
Patch series "Extract DEBUG_WX to shared use".
Some architectures support DEBUG_WX function, it's verbatim from each
others, so extract to mm/Kconfig.debug for shared use.
PPC and ARM ports don't support generic page dumper yet, so we only
refine x86 and arm64 port in this patch series.
For RISC-V port, the DEBUG_WX support depends on other patches which
be merged already:
- RISC-V page table dumper
- Support strict kernel memory permissions for security
This patch (of 4):
Some architectures support DEBUG_WX function, it's verbatim from each
others. Extract to mm/Kconfig.debug for shared use.
[akpm@xxxxxxxxxxxxxxxxxxxx: reword text, per Will Deacon & Zong Li]
Link: http://lkml.kernel.org/r/20200427194245.oxRJKj3fn%25akpm@xxxxxxxxxxxxxxxxxxxx
[zong.li@xxxxxxxxxx: remove the specific name of arm64]
Link: http://lkml.kernel.org/r/3a6a92ecedc54e1d0fc941398e63d504c2cd5611.1589178399.git.zong.li@xxxxxxxxxx
[zong.li@xxxxxxxxxx: add MMU dependency for DEBUG_WX]
Link: http://lkml.kernel.org/r/4a674ac7863ff39ca91847b10e51209771f99416.1589178399.git.zong.li@xxxxxxxxxx
Link: http://lkml.kernel.org/r/cover.1587455584.git.zong.li@xxxxxxxxxx
Link: http://lkml.kernel.org/r/23980cd0f0e5d79e24a92169116407c75bcc650d.1587455584.git.zong.li@xxxxxxxxxx
Signed-off-by: Zong Li <zong.li@xxxxxxxxxx>
Suggested-by: Palmer Dabbelt <palmer@xxxxxxxxxxx>
Cc: Paul Walmsley <paul.walmsley@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/Kconfig.debug | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
--- a/mm/Kconfig.debug~mm-add-debug_wx-support
+++ a/mm/Kconfig.debug
@@ -118,6 +118,38 @@ config DEBUG_RODATA_TEST
---help---
This option enables a testcase for the setting rodata read-only.
+config ARCH_HAS_DEBUG_WX
+ bool
+
+config DEBUG_WX
+ bool "Warn on W+X mappings at boot"
+ depends on ARCH_HAS_DEBUG_WX
+ depends on MMU
+ 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.
+
+ Look for a message in dmesg output like this:
+
+ <arch>/mm: Checked W+X mappings: passed, no W+X pages found.
+
+ or like this, if the check failed:
+
+ <arch>/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 GENERIC_PTDUMP
bool
_
Patches currently in -mm which might be from zong.li@xxxxxxxxxx are
