No self respecting 64-bit program should ever touch that lowly 32-bit
part of address space.
Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
---
mm/Kconfig | 3 ++-
security/Kconfig | 3 ++-
2 files changed, 4 insertions(+), 2 deletions(-)
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -306,7 +306,8 @@ config KSM
config DEFAULT_MMAP_MIN_ADDR
int "Low address space to protect from user allocation"
depends on MMU
- default 4096
+ default 4096 if !64BIT
+ default 4294967296 if 64BIT
help
This is the portion of low virtual memory which should be protected
from userspace allocation. Keeping a user from writing to low pages
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -129,7 +129,8 @@ config LSM_MMAP_MIN_ADDR
int "Low address space for LSM to protect from user allocation"
depends on SECURITY && SECURITY_SELINUX
default 32768 if ARM || (ARM64 && COMPAT)
- default 65536
+ default 65536 if !64BIT
+ default 4294967296 if 64BIT
help
This is the portion of low virtual memory which should be protected
from userspace allocation. Keeping a user from writing to low pages
