diff options
| -rw-r--r-- | arch/s390/include/asm/elf.h | 2 | ||||
| -rw-r--r-- | arch/s390/mm/mmap.c | 11 |
2 files changed, 12 insertions, 1 deletions
diff --git a/arch/s390/include/asm/elf.h b/arch/s390/include/asm/elf.h index 354d42616c7e..9dbd3e7a3bc3 100644 --- a/arch/s390/include/asm/elf.h +++ b/arch/s390/include/asm/elf.h @@ -206,6 +206,8 @@ do { \ current->mm->context.noexec == 0; \ }) +#define STACK_RND_MASK 0x7ffUL + #define ARCH_DLINFO \ do { \ if (vdso_enabled) \ diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c index 869efbaed3ea..5578740ab9c9 100644 --- a/arch/s390/mm/mmap.c +++ b/arch/s390/mm/mmap.c @@ -30,6 +30,15 @@ #include <asm/pgalloc.h> #include <asm/compat.h> +static unsigned long stack_maxrandom_size(void) +{ + if (!(current->flags & PF_RANDOMIZE)) + return 0; + if (current->personality & ADDR_NO_RANDOMIZE) + return 0; + return STACK_RND_MASK << PAGE_SHIFT; +} + /* * Top of mmap area (just below the process stack). * @@ -47,7 +56,7 @@ static inline unsigned long mmap_base(void) else if (gap > MAX_GAP) gap = MAX_GAP; - return STACK_TOP - (gap & PAGE_MASK); + return STACK_TOP - stack_maxrandom_size() - (gap & PAGE_MASK); } static inline int mmap_is_legacy(void) |