1 files changed, 636 insertions, 0 deletions

diff --git a/arch/x86/mm/fault_64.c b/arch/x86/mm/fault_64.c
new file mode 100644
index 000000000000..54816adb8e93
--- /dev/null
+++ b/arch/x86/mm/fault_64.c
@@ -0,0 +1,636 @@
+/*
+ *  linux/arch/x86-64/mm/fault.c
+ *
+ *  Copyright (C) 1995  Linus Torvalds
+ *  Copyright (C) 2001,2002 Andi Kleen, SuSE Labs.
+ */
+
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/tty.h>
+#include <linux/vt_kern.h>              /* For unblank_screen() */
+#include <linux/compiler.h>
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <linux/kprobes.h>
+#include <linux/uaccess.h>
+#include <linux/kdebug.h>
+
+#include <asm/system.h>
+#include <asm/pgalloc.h>
+#include <asm/smp.h>
+#include <asm/tlbflush.h>
+#include <asm/proto.h>
+#include <asm-generic/sections.h>
+
+/* Page fault error code bits */
+#define PF_PROT (1<<0)          /* or no page found */
+#define PF_WRITE        (1<<1)
+#define PF_USER (1<<2)
+#define PF_RSVD (1<<3)
+#define PF_INSTR        (1<<4)
+
+static ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);
+
+/* Hook to register for page fault notifications */
+int register_page_fault_notifier(struct notifier_block *nb)
+{
+        vmalloc_sync_all();
+        return atomic_notifier_chain_register(&notify_page_fault_chain, nb);
+}
+EXPORT_SYMBOL_GPL(register_page_fault_notifier);
+
+int unregister_page_fault_notifier(struct notifier_block *nb)
+{
+        return atomic_notifier_chain_unregister(&notify_page_fault_chain, nb);
+}
+EXPORT_SYMBOL_GPL(unregister_page_fault_notifier);
+
+static inline int notify_page_fault(struct pt_regs *regs, long err)
+{
+        struct die_args args = {
+                .regs = regs,
+                .str = "page fault",
+                .err = err,
+                .trapnr = 14,
+                .signr = SIGSEGV
+        };
+        return atomic_notifier_call_chain(&notify_page_fault_chain,
+                                          DIE_PAGE_FAULT, &args);
+}
+
+/* Sometimes the CPU reports invalid exceptions on prefetch.
+   Check that here and ignore.
+   Opcode checker based on code by Richard Brunner */
+static noinline int is_prefetch(struct pt_regs *regs, unsigned long addr,
+                                unsigned long error_code)
+{ 
+        unsigned char *instr;
+        int scan_more = 1;
+        int prefetch = 0; 
+        unsigned char *max_instr;
+
+        /* If it was a exec fault ignore */
+        if (error_code & PF_INSTR)
+                return 0;
+        
+        instr = (unsigned char __user *)convert_rip_to_linear(current, regs);
+        max_instr = instr + 15;
+
+        if (user_mode(regs) && instr >= (unsigned char *)TASK_SIZE)
+                return 0;
+
+        while (scan_more && instr < max_instr) { 
+                unsigned char opcode;
+                unsigned char instr_hi;
+                unsigned char instr_lo;
+
+                if (probe_kernel_address(instr, opcode))
+                        break; 
+
+                instr_hi = opcode & 0xf0; 
+                instr_lo = opcode & 0x0f; 
+                instr++;
+
+                switch (instr_hi) { 
+                case 0x20:
+                case 0x30:
+                        /* Values 0x26,0x2E,0x36,0x3E are valid x86
+                           prefixes.  In long mode, the CPU will signal
+                           invalid opcode if some of these prefixes are
+                           present so we will never get here anyway */
+                        scan_more = ((instr_lo & 7) == 0x6);
+                        break;
+                        
+                case 0x40:
+                        /* In AMD64 long mode, 0x40 to 0x4F are valid REX prefixes
+                           Need to figure out under what instruction mode the
+                           instruction was issued ... */
+                        /* Could check the LDT for lm, but for now it's good
+                           enough to assume that long mode only uses well known
+                           segments or kernel. */
+                        scan_more = (!user_mode(regs)) || (regs->cs == __USER_CS);
+                        break;
+                        
+                case 0x60:
+                        /* 0x64 thru 0x67 are valid prefixes in all modes. */
+                        scan_more = (instr_lo & 0xC) == 0x4;
+                        break;          
+                case 0xF0:
+                        /* 0xF0, 0xF2, and 0xF3 are valid prefixes in all modes. */
+                        scan_more = !instr_lo || (instr_lo>>1) == 1;
+                        break;                  
+                case 0x00:
+                        /* Prefetch instruction is 0x0F0D or 0x0F18 */
+                        scan_more = 0;
+                        if (probe_kernel_address(instr, opcode))
+                                break;
+                        prefetch = (instr_lo == 0xF) &&
+                                (opcode == 0x0D || opcode == 0x18);
+                        break;                  
+                default:
+                        scan_more = 0;
+                        break;
+                } 
+        }
+        return prefetch;
+}
+
+static int bad_address(void *p) 
+{ 
+        unsigned long dummy;
+        return probe_kernel_address((unsigned long *)p, dummy);
+} 
+
+void dump_pagetable(unsigned long address)
+{
+        pgd_t *pgd;
+        pud_t *pud;
+        pmd_t *pmd;
+        pte_t *pte;
+
+        pgd = (pgd_t *)read_cr3();
+
+        pgd = __va((unsigned long)pgd & PHYSICAL_PAGE_MASK); 
+        pgd += pgd_index(address);
+        if (bad_address(pgd)) goto bad;
+        printk("PGD %lx ", pgd_val(*pgd));
+        if (!pgd_present(*pgd)) goto ret; 
+
+        pud = pud_offset(pgd, address);
+        if (bad_address(pud)) goto bad;
+        printk("PUD %lx ", pud_val(*pud));
+        if (!pud_present(*pud)) goto ret;
+
+        pmd = pmd_offset(pud, address);
+        if (bad_address(pmd)) goto bad;
+        printk("PMD %lx ", pmd_val(*pmd));
+        if (!pmd_present(*pmd)) goto ret;        
+
+        pte = pte_offset_kernel(pmd, address);
+        if (bad_address(pte)) goto bad;
+        printk("PTE %lx", pte_val(*pte)); 
+ret:
+        printk("\n");
+        return;
+bad:
+        printk("BAD\n");
+}
+
+static const char errata93_warning[] = 
+KERN_ERR "******* Your BIOS seems to not contain a fix for K8 errata #93\n"
+KERN_ERR "******* Working around it, but it may cause SEGVs or burn power.\n"
+KERN_ERR "******* Please consider a BIOS update.\n"
+KERN_ERR "******* Disabling USB legacy in the BIOS may also help.\n";
+
+/* Workaround for K8 erratum #93 & buggy BIOS.
+   BIOS SMM functions are required to use a specific workaround
+   to avoid corruption of the 64bit RIP register on C stepping K8. 
+   A lot of BIOS that didn't get tested properly miss this. 
+   The OS sees this as a page fault with the upper 32bits of RIP cleared.
+   Try to work around it here.
+   Note we only handle faults in kernel here. */
+
+static int is_errata93(struct pt_regs *regs, unsigned long address) 
+{
+        static int warned;
+        if (address != regs->rip)
+                return 0;
+        if ((address >> 32) != 0) 
+                return 0;
+        address |= 0xffffffffUL << 32;
+        if ((address >= (u64)_stext && address <= (u64)_etext) || 
+            (address >= MODULES_VADDR && address <= MODULES_END)) { 
+                if (!warned) {
+                        printk(errata93_warning);               
+                        warned = 1;
+                }
+                regs->rip = address;
+                return 1;
+        }
+        return 0;
+} 
+
+static noinline void pgtable_bad(unsigned long address, struct pt_regs *regs,
+                                 unsigned long error_code)
+{
+        unsigned long flags = oops_begin();
+        struct task_struct *tsk;
+
+        printk(KERN_ALERT "%s: Corrupted page table at address %lx\n",
+               current->comm, address);
+        dump_pagetable(address);
+        tsk = current;
+        tsk->thread.cr2 = address;
+        tsk->thread.trap_no = 14;
+        tsk->thread.error_code = error_code;
+        __die("Bad pagetable", regs, error_code);
+        oops_end(flags);
+        do_exit(SIGKILL);
+}
+
+/*
+ * Handle a fault on the vmalloc area
+ *
+ * This assumes no large pages in there.
+ */
+static int vmalloc_fault(unsigned long address)
+{
+        pgd_t *pgd, *pgd_ref;
+        pud_t *pud, *pud_ref;
+        pmd_t *pmd, *pmd_ref;
+        pte_t *pte, *pte_ref;
+
+        /* Copy kernel mappings over when needed. This can also
+           happen within a race in page table update. In the later
+           case just flush. */
+
+        pgd = pgd_offset(current->mm ?: &init_mm, address);
+        pgd_ref = pgd_offset_k(address);
+        if (pgd_none(*pgd_ref))
+                return -1;
+        if (pgd_none(*pgd))
+                set_pgd(pgd, *pgd_ref);
+        else
+                BUG_ON(pgd_page_vaddr(*pgd) != pgd_page_vaddr(*pgd_ref));
+
+        /* Below here mismatches are bugs because these lower tables
+           are shared */
+
+        pud = pud_offset(pgd, address);
+        pud_ref = pud_offset(pgd_ref, address);
+        if (pud_none(*pud_ref))
+                return -1;
+        if (pud_none(*pud) || pud_page_vaddr(*pud) != pud_page_vaddr(*pud_ref))
+                BUG();
+        pmd = pmd_offset(pud, address);
+        pmd_ref = pmd_offset(pud_ref, address);
+        if (pmd_none(*pmd_ref))
+                return -1;
+        if (pmd_none(*pmd) || pmd_page(*pmd) != pmd_page(*pmd_ref))
+                BUG();
+        pte_ref = pte_offset_kernel(pmd_ref, address);
+        if (!pte_present(*pte_ref))
+                return -1;
+        pte = pte_offset_kernel(pmd, address);
+        /* Don't use pte_page here, because the mappings can point
+           outside mem_map, and the NUMA hash lookup cannot handle
+           that. */
+        if (!pte_present(*pte) || pte_pfn(*pte) != pte_pfn(*pte_ref))
+                BUG();
+        return 0;
+}
+
+static int page_fault_trace;
+int show_unhandled_signals = 1;
+
+/*
+ * This routine handles page faults.  It determines the address,
+ * and the problem, and then passes it off to one of the appropriate
+ * routines.
+ */
+asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
+                                        unsigned long error_code)
+{
+        struct task_struct *tsk;
+        struct mm_struct *mm;
+        struct vm_area_struct * vma;
+        unsigned long address;
+        const struct exception_table_entry *fixup;
+        int write, fault;
+        unsigned long flags;
+        siginfo_t info;
+
+        tsk = current;
+        mm = tsk->mm;
+        prefetchw(&mm->mmap_sem);
+
+        /* get the address */
+        address = read_cr2();
+
+        info.si_code = SEGV_MAPERR;
+
+
+        /*
+         * We fault-in kernel-space virtual memory on-demand. The
+         * 'reference' page table is init_mm.pgd.
+         *
+         * NOTE! We MUST NOT take any locks for this case. We may
+         * be in an interrupt or a critical region, and should
+         * only copy the information from the master page table,
+         * nothing more.
+         *
+         * This verifies that the fault happens in kernel space
+         * (error_code & 4) == 0, and that the fault was not a
+         * protection error (error_code & 9) == 0.
+         */
+        if (unlikely(address >= TASK_SIZE64)) {
+                /*
+                 * Don't check for the module range here: its PML4
+                 * is always initialized because it's shared with the main
+                 * kernel text. Only vmalloc may need PML4 syncups.
+                 */
+                if (!(error_code & (PF_RSVD|PF_USER|PF_PROT)) &&
+                      ((address >= VMALLOC_START && address < VMALLOC_END))) {
+                        if (vmalloc_fault(address) >= 0)
+                                return;
+                }
+                if (notify_page_fault(regs, error_code) == NOTIFY_STOP)
+                        return;
+                /*
+                 * Don't take the mm semaphore here. If we fixup a prefetch
+                 * fault we could otherwise deadlock.
+                 */
+                goto bad_area_nosemaphore;
+        }
+
+        if (notify_page_fault(regs, error_code) == NOTIFY_STOP)
+                return;
+
+        if (likely(regs->eflags & X86_EFLAGS_IF))
+                local_irq_enable();
+
+        if (unlikely(page_fault_trace))
+                printk("pagefault rip:%lx rsp:%lx cs:%lu ss:%lu address %lx error %lx\n",
+                       regs->rip,regs->rsp,regs->cs,regs->ss,address,error_code); 
+
+        if (unlikely(error_code & PF_RSVD))
+                pgtable_bad(address, regs, error_code);
+
+        /*
+         * If we're in an interrupt or have no user
+         * context, we must not take the fault..
+         */
+        if (unlikely(in_atomic() || !mm))
+                goto bad_area_nosemaphore;
+
+        /*
+         * User-mode registers count as a user access even for any
+         * potential system fault or CPU buglet.
+         */
+        if (user_mode_vm(regs))
+                error_code |= PF_USER;
+
+ again:
+        /* When running in the kernel we expect faults to occur only to
+         * addresses in user space.  All other faults represent errors in the
+         * kernel and should generate an OOPS.  Unfortunatly, in the case of an
+         * erroneous fault occurring in a code path which already holds mmap_sem
+         * we will deadlock attempting to validate the fault against the
+         * address space.  Luckily the kernel only validly references user
+         * space from well defined areas of code, which are listed in the
+         * exceptions table.
+         *
+         * As the vast majority of faults will be valid we will only perform
+         * the source reference check when there is a possibilty of a deadlock.
+         * Attempt to lock the address space, if we cannot we then validate the
+         * source.  If this is invalid we can skip the address space check,
+         * thus avoiding the deadlock.
+         */
+        if (!down_read_trylock(&mm->mmap_sem)) {
+                if ((error_code & PF_USER) == 0 &&
+                    !search_exception_tables(regs->rip))
+                        goto bad_area_nosemaphore;
+                down_read(&mm->mmap_sem);
+        }
+
+        vma = find_vma(mm, address);
+        if (!vma)
+                goto bad_area;
+        if (likely(vma->vm_start <= address))
+                goto good_area;
+        if (!(vma->vm_flags & VM_GROWSDOWN))
+                goto bad_area;
+        if (error_code & 4) {
+                /* Allow userspace just enough access below the stack pointer
+                 * to let the 'enter' instruction work.
+                 */
+                if (address + 65536 + 32 * sizeof(unsigned long) < regs->rsp)
+                        goto bad_area;
+        }
+        if (expand_stack(vma, address))
+                goto bad_area;
+/*
+ * Ok, we have a good vm_area for this memory access, so
+ * we can handle it..
+ */
+good_area:
+        info.si_code = SEGV_ACCERR;
+        write = 0;
+        switch (error_code & (PF_PROT|PF_WRITE)) {
+                default:        /* 3: write, present */
+                        /* fall through */
+                case PF_WRITE:          /* write, not present */
+                        if (!(vma->vm_flags & VM_WRITE))
+                                goto bad_area;
+                        write++;
+                        break;
+                case PF_PROT:           /* read, present */
+                        goto bad_area;
+                case 0:                 /* read, not present */
+                        if (!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)))
+                                goto bad_area;
+        }
+
+        /*
+         * If for any reason at all we couldn't handle the fault,
+         * make sure we exit gracefully rather than endlessly redo
+         * the fault.
+         */
+        fault = handle_mm_fault(mm, vma, address, write);
+        if (unlikely(fault & VM_FAULT_ERROR)) {
+                if (fault & VM_FAULT_OOM)
+                        goto out_of_memory;
+                else if (fault & VM_FAULT_SIGBUS)
+                        goto do_sigbus;
+                BUG();
+        }
+        if (fault & VM_FAULT_MAJOR)
+                tsk->maj_flt++;
+        else
+                tsk->min_flt++;
+        up_read(&mm->mmap_sem);
+        return;
+
+/*
+ * Something tried to access memory that isn't in our memory map..
+ * Fix it, but check if it's kernel or user first..
+ */
+bad_area:
+        up_read(&mm->mmap_sem);
+
+bad_area_nosemaphore:
+        /* User mode accesses just cause a SIGSEGV */
+        if (error_code & PF_USER) {
+
+                /*
+                 * It's possible to have interrupts off here.
+                 */
+                local_irq_enable();
+
+                if (is_prefetch(regs, address, error_code))
+                        return;
+
+                /* Work around K8 erratum #100 K8 in compat mode
+                   occasionally jumps to illegal addresses >4GB.  We
+                   catch this here in the page fault handler because
+                   these addresses are not reachable. Just detect this
+                   case and return.  Any code segment in LDT is
+                   compatibility mode. */
+                if ((regs->cs == __USER32_CS || (regs->cs & (1<<2))) &&
+                    (address >> 32))
+                        return;
+
+                if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) &&
+                    printk_ratelimit()) {
+                        printk(
+                       "%s%s[%d]: segfault at %016lx rip %016lx rsp %016lx error %lx\n",
+                                        tsk->pid > 1 ? KERN_INFO : KERN_EMERG,
+                                        tsk->comm, tsk->pid, address, regs->rip,
+                                        regs->rsp, error_code);
+                }
+       
+                tsk->thread.cr2 = address;
+                /* Kernel addresses are always protection faults */
+                tsk->thread.error_code = error_code | (address >= TASK_SIZE);
+                tsk->thread.trap_no = 14;
+                info.si_signo = SIGSEGV;
+                info.si_errno = 0;
+                /* info.si_code has been set above */
+                info.si_addr = (void __user *)address;
+                force_sig_info(SIGSEGV, &info, tsk);
+                return;
+        }
+
+no_context:
+        
+        /* Are we prepared to handle this kernel fault?  */
+        fixup = search_exception_tables(regs->rip);
+        if (fixup) {
+                regs->rip = fixup->fixup;
+                return;
+        }
+
+        /* 
+         * Hall of shame of CPU/BIOS bugs.
+         */
+
+        if (is_prefetch(regs, address, error_code))
+                return;
+
+        if (is_errata93(regs, address))
+                return; 
+
+/*
+ * Oops. The kernel tried to access some bad page. We'll have to
+ * terminate things with extreme prejudice.
+ */
+
+        flags = oops_begin();
+
+        if (address < PAGE_SIZE)
+                printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
+        else
+                printk(KERN_ALERT "Unable to handle kernel paging request");
+        printk(" at %016lx RIP: \n" KERN_ALERT,address);
+        printk_address(regs->rip);
+        dump_pagetable(address);
+        tsk->thread.cr2 = address;
+        tsk->thread.trap_no = 14;
+        tsk->thread.error_code = error_code;
+        __die("Oops", regs, error_code);
+        /* Executive summary in case the body of the oops scrolled away */
+        printk(KERN_EMERG "CR2: %016lx\n", address);
+        oops_end(flags);
+        do_exit(SIGKILL);
+
+/*
+ * We ran out of memory, or some other thing happened to us that made
+ * us unable to handle the page fault gracefully.
+ */
+out_of_memory:
+        up_read(&mm->mmap_sem);
+        if (is_init(current)) {
+                yield();
+                goto again;
+        }
+        printk("VM: killing process %s\n", tsk->comm);
+        if (error_code & 4)
+                do_group_exit(SIGKILL);
+        goto no_context;
+
+do_sigbus:
+        up_read(&mm->mmap_sem);
+
+        /* Kernel mode? Handle exceptions or die */
+        if (!(error_code & PF_USER))
+                goto no_context;
+
+        tsk->thread.cr2 = address;
+        tsk->thread.error_code = error_code;
+        tsk->thread.trap_no = 14;
+        info.si_signo = SIGBUS;
+        info.si_errno = 0;
+        info.si_code = BUS_ADRERR;
+        info.si_addr = (void __user *)address;
+        force_sig_info(SIGBUS, &info, tsk);
+        return;
+}
+
+DEFINE_SPINLOCK(pgd_lock);
+LIST_HEAD(pgd_list);
+
+void vmalloc_sync_all(void)
+{
+        /* Note that races in the updates of insync and start aren't 
+           problematic:
+           insync can only get set bits added, and updates to start are only
+           improving performance (without affecting correctness if undone). */
+        static DECLARE_BITMAP(insync, PTRS_PER_PGD);
+        static unsigned long start = VMALLOC_START & PGDIR_MASK;
+        unsigned long address;
+
+        for (address = start; address <= VMALLOC_END; address += PGDIR_SIZE) {
+                if (!test_bit(pgd_index(address), insync)) {
+                        const pgd_t *pgd_ref = pgd_offset_k(address);
+                        struct page *page;
+
+                        if (pgd_none(*pgd_ref))
+                                continue;
+                        spin_lock(&pgd_lock);
+                        list_for_each_entry(page, &pgd_list, lru) {
+                                pgd_t *pgd;
+                                pgd = (pgd_t *)page_address(page) + pgd_index(address);
+                                if (pgd_none(*pgd))
+                                        set_pgd(pgd, *pgd_ref);
+                                else
+                                        BUG_ON(pgd_page_vaddr(*pgd) != pgd_page_vaddr(*pgd_ref));
+                        }
+                        spin_unlock(&pgd_lock);
+                        set_bit(pgd_index(address), insync);
+                }
+                if (address == start)
+                        start = address + PGDIR_SIZE;
+        }
+        /* Check that there is no need to do the same for the modules area. */
+        BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL));
+        BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) == 
+                                (__START_KERNEL & PGDIR_MASK)));
+}
+
+static int __init enable_pagefaulttrace(char *str)
+{
+        page_fault_trace = 1;
+        return 1;
+}
+__setup("pagefaulttrace", enable_pagefaulttrace);