On 4/8/19 10:04 AM, Alexander Potapenko wrote: > diff --git a/security/Kconfig.initmem b/security/Kconfig.initmem > new file mode 100644 > index 000000000000..5e49a55382ad > --- /dev/null > +++ b/security/Kconfig.initmem > @@ -0,0 +1,29 @@ > +menu "Initialize all memory" > + > +config CC_HAS_AUTO_VAR_INIT > + def_bool $(cc-option,-ftrivial-auto-var-init=pattern) > + > +config INIT_ALL_MEMORY > + bool "Initialize all memory" > + default n > + help > + Enforce memory initialization to mitigate infoleaks and make > + the control-flow bugs depending on uninitialized values more > + deterministic. > + > +if INIT_ALL_MEMORY > + > +config INIT_ALL_STACK > + bool "Initialize all stack" > + depends on INIT_ALL_MEMORY This "depends on" is redundant with the "if INIT_ALL_MEMORY" above it. Similar comment for patch 2/2 and INIT_ALL_HEAP. > + depends on CC_HAS_AUTO_VAR_INIT || (HAVE_GCC_PLUGINS && PLUGIN_HOSTCC != "") > + select GCC_PLUGINS if !CC_HAS_AUTO_VAR_INIT > + select GCC_PLUGIN_STRUCTLEAK if !CC_HAS_AUTO_VAR_INIT > + select GCC_PLUGIN_STRUCTLEAK_BYREF_ALL if !CC_HAS_AUTO_VAR_INIT > + default y > + help > + Initialize uninitialized stack data with a fixed pattern > + (0x00 in GCC, 0xAA in Clang). > + > +endif # INIT_ALL_MEMORY > +endmenu -- ~Randy
