1 files changed, 11 insertions, 0 deletions

diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index 610aaecc19f8..239fd9fba0a5 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -5,6 +5,17 @@ config TRACE_IRQFLAGS_SUPPORT
 
 source "lib/Kconfig.debug"
 
+config NONPROMISC_DEVMEM
+        bool "Disable promiscuous /dev/mem"
+        help
+          The /dev/mem file by default only allows userspace access to PCI
+          space and the BIOS code and data regions. This is sufficient for
+          dosemu and X and all common users of /dev/mem. With this config
+          option, you allow userspace access to all of memory, including
+          kernel and userspace memory. Accidental access to this is
+          obviously disasterous, but specific access can be used by people
+          debugging the kernel.
+
 config EARLY_PRINTK
         bool "Early printk" if EMBEDDED
         default y