diff options
Diffstat (limited to 'arch/s390/kernel/process.c')
| -rw-r--r-- | arch/s390/kernel/process.c | 59 |
1 files changed, 49 insertions, 10 deletions
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c index ec2e03b22ead..a895e69379f7 100644 --- a/arch/s390/kernel/process.c +++ b/arch/s390/kernel/process.c @@ -30,8 +30,11 @@ #include <linux/tick.h> #include <linux/elfcore.h> #include <linux/kernel_stat.h> +#include <linux/personality.h> #include <linux/syscalls.h> #include <linux/compat.h> +#include <linux/kprobes.h> +#include <linux/random.h> #include <asm/compat.h> #include <asm/uaccess.h> #include <asm/pgtable.h> @@ -41,6 +44,7 @@ #include <asm/irq.h> #include <asm/timer.h> #include <asm/nmi.h> +#include <asm/smp.h> #include "entry.h" asmlinkage void ret_from_fork(void) asm ("ret_from_fork"); @@ -75,13 +79,8 @@ unsigned long thread_saved_pc(struct task_struct *tsk) */ static void default_idle(void) { - /* CPU is going idle. */ -#ifdef CONFIG_HOTPLUG_CPU - if (cpu_is_offline(smp_processor_id())) { - preempt_enable_no_resched(); + if (cpu_is_offline(smp_processor_id())) cpu_die(); - } -#endif local_irq_disable(); if (need_resched()) { local_irq_enable(); @@ -116,15 +115,17 @@ void cpu_idle(void) } } -extern void kernel_thread_starter(void); +extern void __kprobes kernel_thread_starter(void); asm( - ".align 4\n" + ".section .kprobes.text, \"ax\"\n" + ".global kernel_thread_starter\n" "kernel_thread_starter:\n" " la 2,0(10)\n" " basr 14,9\n" " la 2,0\n" - " br 11\n"); + " br 11\n" + ".previous\n"); int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) { @@ -214,8 +215,10 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp, /* start new process with ar4 pointing to the correct address space */ p->thread.mm_segment = get_fs(); /* Don't copy debug registers */ - memset(&p->thread.per_info, 0, sizeof(p->thread.per_info)); + memset(&p->thread.per_user, 0, sizeof(p->thread.per_user)); + memset(&p->thread.per_event, 0, sizeof(p->thread.per_event)); clear_tsk_thread_flag(p, TIF_SINGLE_STEP); + clear_tsk_thread_flag(p, TIF_PER_TRAP); /* Initialize per thread user and system timer values */ ti = task_thread_info(p); ti->user_timer = 0; @@ -331,3 +334,39 @@ unsigned long get_wchan(struct task_struct *p) } return 0; } + +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; +} + +static inline unsigned long brk_rnd(void) +{ + /* 8MB for 32bit, 1GB for 64bit */ + if (is_32bit_task()) + return (get_random_int() & 0x7ffUL) << PAGE_SHIFT; + else + return (get_random_int() & 0x3ffffUL) << PAGE_SHIFT; +} + +unsigned long arch_randomize_brk(struct mm_struct *mm) +{ + unsigned long ret = PAGE_ALIGN(mm->brk + brk_rnd()); + + if (ret < mm->brk) + return mm->brk; + return ret; +} + +unsigned long randomize_et_dyn(unsigned long base) +{ + unsigned long ret = PAGE_ALIGN(base + brk_rnd()); + + if (!(current->flags & PF_RANDOMIZE)) + return base; + if (ret < base) + return base; + return ret; +} |