Change Details

Randomize the address of shared page. The random offset w.r.t the legacy fixed address is stored in struct vmspace. It's inherited on fork. In order to make space for a new MAP_ASLR_SHARED_PAGE vm_flags flags its type was changed from u_char to uint16_t. This increases the size of struct vm_map and might therefore require a bump of FreeBSD version. The shared page mapping was moved from exec_new_vmspace to exec_map_stack. The former function was called before image activator has a chance to parse ASLR related flags. The behavior can be changed using kern.elf64.aslr.shared_page sysctl. The feature is enabled by default for 64 bit applications.

Randomize the address of shared page and store it in struct vmspace. It's inherited on fork. In order to make space for a new MAP_ASLR_SHARED_PAGE vm_flags flags its type was changed from u_char to uint16_t. This increases the size of struct vm_map and might therefore require a bump of FreeBSD version. The shared page mapping was moved from exec_new_vmspace to exec_map_stack. The former function was called before image activator has a chance to parse ASLR related flags. The behavior can be changed using kern.elf64.aslr.shared_page sysctl. The feature is enabled by default for 64 bit applications.

Randomize the address of shared page. The random offset w.r.t the legacy fixed address is stored and store it in struct vmspace. It's inherited on fork. In order to make space for a new MAP_ASLR_SHARED_PAGE vm_flags flags its type was changed from u_char to uint16_t. This increases the size of struct vm_map and might therefore require a bump of FreeBSD version. The shared page mapping was moved from exec_new_vmspace to exec_map_stack. The former function was called before image activator has a chance to parse ASLR related flags. The behavior can be changed using kern.elf64.aslr.shared_page sysctl. The feature is enabled by default for 64 bit applications.