From 05f9ca83596c7801549a2b4eba469d51baf5480f Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Fri, 17 Mar 2006 17:42:57 -0800 Subject: [PATCH] [SPARC64]: Randomize mm->mmap_base when PF_RANDOMIZE is set. Signed-off-by: David S. Miller --- arch/sparc64/kernel/sys_sparc.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/arch/sparc64/kernel/sys_sparc.c b/arch/sparc64/kernel/sys_sparc.c index 9019b41fc0..7a869138c3 100644 --- a/arch/sparc64/kernel/sys_sparc.c +++ b/arch/sparc64/kernel/sys_sparc.c @@ -25,6 +25,7 @@ #include #include #include +#include #include #include @@ -358,6 +359,17 @@ unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, u /* Essentially the same as PowerPC... */ void arch_pick_mmap_layout(struct mm_struct *mm) { + unsigned long random_factor = 0UL; + + if (current->flags & PF_RANDOMIZE) { + random_factor = get_random_int(); + if (test_thread_flag(TIF_32BIT)) + random_factor &= ((1 * 1024 * 1024) - 1); + else + random_factor = ((random_factor << PAGE_SHIFT) & + 0xffffffffUL); + } + /* * Fall back to the standard layout if the personality * bit is set, or if the expected stack growth is unlimited: @@ -366,7 +378,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm) (current->personality & ADDR_COMPAT_LAYOUT) || current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY || sysctl_legacy_va_layout) { - mm->mmap_base = TASK_UNMAPPED_BASE; + mm->mmap_base = TASK_UNMAPPED_BASE + random_factor; mm->get_unmapped_area = arch_get_unmapped_area; mm->unmap_area = arch_unmap_area; } else { @@ -380,7 +392,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm) if (gap > (task_size / 6 * 5)) gap = (task_size / 6 * 5); - mm->mmap_base = task_size - (gap & PAGE_MASK); + mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor); mm->get_unmapped_area = arch_get_unmapped_area_topdown; mm->unmap_area = arch_unmap_area_topdown; } -- 2.39.5