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authorZong Li <zong.li@sifive.com>2020-06-04 02:03:58 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-04 06:09:50 +0300
commit7e01ccb43d62558dc65c53477a78da133ad8c377 (patch)
treedf2952f7a98e0e1bdf8263ca75622ee75d011ba9 /arch/x86/Kconfig.debug
parentb422d28b21773bbfc9e84dbb5579a8ce355279ca (diff)
downloadlinux-7e01ccb43d62558dc65c53477a78da133ad8c377.tar.xz
x86: 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@sifive.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will@kernel.org> Link: http://lkml.kernel.org/r/430736828d149df3f5b462d291e845ec690e0141.1587455584.git.zong.li@sifive.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86/Kconfig.debug')
-rw-r--r--arch/x86/Kconfig.debug27
1 files changed, 0 insertions, 27 deletions
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index f909d3ce36e6..fdf1431ac8c2 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -72,33 +72,6 @@ config EFI_PGT_DUMP
issues with the mapping of the EFI runtime regions into that
table.
-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.
-
- Look for a message in dmesg output like this:
-
- x86/mm: Checked W+X mappings: passed, no W+X pages found.
-
- or like this, if the check failed:
-
- x86/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_TLBFLUSH
bool "Set upper limit of TLB entries to flush one-by-one"
depends on DEBUG_KERNEL