From d839088caec6891a5070f0b1ce61031e458533a9 Mon Sep 17 00:00:00 2001 From: Anton Blanchard Date: Sun, 22 Feb 2009 01:50:03 +0000 Subject: [PATCH] powerpc: Randomise lower bits of stack address Randomise the lower bits of the stack address. More randomisation is good for security but the scatter can also help with SMT threads that share an L1. A quick test case shows this working: int main() { int sp; printf("%x\n", (unsigned long)&sp & 4095); } before: 80 80 80 80 80 after: 610 490 300 6b0 d80 Signed-off-by: Anton Blanchard Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/include/asm/system.h | 2 +- arch/powerpc/kernel/process.c | 9 +++++++++ 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/include/asm/system.h b/arch/powerpc/include/asm/system.h index 2a4be19a92c4..f612798e1c93 100644 --- a/arch/powerpc/include/asm/system.h +++ b/arch/powerpc/include/asm/system.h @@ -531,7 +531,7 @@ __cmpxchg_local(volatile void *ptr, unsigned long old, unsigned long new, #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n)) #endif -#define arch_align_stack(x) (x) +extern unsigned long arch_align_stack(unsigned long sp); /* Used in very early kernel initialization. */ extern unsigned long reloc_offset(void); diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 8ede428e76c0..69b9d2d3cb84 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -35,6 +35,8 @@ #include #include #include +#include +#include #include #include @@ -1138,3 +1140,10 @@ void thread_info_cache_init(void) } #endif /* THREAD_SHIFT < PAGE_SHIFT */ + +unsigned long arch_align_stack(unsigned long sp) +{ + if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) + sp -= get_random_int() & ~PAGE_MASK; + return sp & ~0xf; +} -- 2.30.2