1 files changed, 579 insertions, 0 deletions

diff --git a/arch/x86_64/mm/fault.c b/arch/x86_64/mm/fault.c
new file mode 100644
index 000000000000..5724370475cc
--- /dev/null
+++ b/arch/x86_64/mm/fault.c
@@ -0,0 +1,579 @@
+/*
+ *  linux/arch/x86-64/mm/fault.c
+ *
+ *  Copyright (C) 1995  Linus Torvalds
+ *  Copyright (C) 2001,2002 Andi Kleen, SuSE Labs.
+ */
+
+#include <linux/config.h>
+#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/smp_lock.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/module.h>
+#include <linux/kprobes.h>
+
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/pgalloc.h>
+#include <asm/smp.h>
+#include <asm/tlbflush.h>
+#include <asm/proto.h>
+#include <asm/kdebug.h>
+#include <asm-generic/sections.h>
+#include <asm/kdebug.h>
+
+void bust_spinlocks(int yes)
+{
+	int loglevel_save = console_loglevel;
+	if (yes) {
+		oops_in_progress = 1;
+	} else {
+#ifdef CONFIG_VT
+		unblank_screen();
+#endif
+		oops_in_progress = 0;
+		/*
+		 * OK, the message is on the console.  Now we call printk()
+		 * without oops_in_progress set so that printk will give klogd
+		 * a poke.  Hold onto your hats...
+		 */
+		console_loglevel = 15;		/* NMI oopser may have shut the console up */
+		printk(" ");
+		console_loglevel = loglevel_save;
+	}
+}
+
+/* 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 = (unsigned char *)(regs->rip);
+	int scan_more = 1;
+	int prefetch = 0; 
+	unsigned char *max_instr = instr + 15;
+
+	/* If it was a exec fault ignore */
+	if (error_code & (1<<4))
+		return 0;
+	
+	/* Code segments in LDT could have a non zero base. Don't check
+	   when that's possible */
+	if (regs->cs & (1<<2))
+		return 0;
+
+	if ((regs->cs & 3) != 0 && regs->rip >= TASK_SIZE)
+		return 0;
+
+	while (scan_more && instr < max_instr) { 
+		unsigned char opcode;
+		unsigned char instr_hi;
+		unsigned char instr_lo;
+
+		if (__get_user(opcode, instr))
+			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 = ((regs->cs & 3) == 0) || (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 (__get_user(opcode, instr)) 
+				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 __get_user(dummy, (unsigned long *)p);
+} 
+
+void dump_pagetable(unsigned long address)
+{
+	pgd_t *pgd;
+	pud_t *pud;
+	pmd_t *pmd;
+	pte_t *pte;
+
+	asm("movq %%cr3,%0" : "=r" (pgd));
+
+	pgd = __va((unsigned long)pgd & PHYSICAL_PAGE_MASK); 
+	pgd += pgd_index(address);
+	printk("PGD %lx ", pgd_val(*pgd));
+	if (bad_address(pgd)) goto bad;
+	if (!pgd_present(*pgd)) goto ret; 
+
+	pud = __pud_offset_k((pud_t *)pgd_page(*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;
+} 
+
+int unhandled_signal(struct task_struct *tsk, int sig)
+{
+	if (tsk->pid == 1)
+		return 1;
+	/* Warn for strace, but not for gdb */
+	if (!test_ti_thread_flag(tsk->thread_info, TIF_SYSCALL_TRACE) &&
+	    (tsk->ptrace & PT_PTRACED))
+		return 0;
+	return (tsk->sighand->action[sig-1].sa.sa_handler == SIG_IGN) ||
+		(tsk->sighand->action[sig-1].sa.sa_handler == SIG_DFL);
+}
+
+static noinline void pgtable_bad(unsigned long address, struct pt_regs *regs,
+				 unsigned long error_code)
+{
+	oops_begin();
+	printk(KERN_ALERT "%s: Corrupted page table at address %lx\n",
+	       current->comm, address);
+	dump_pagetable(address);
+	__die("Bad pagetable", regs, error_code);
+	oops_end();
+	do_exit(SIGKILL);
+}
+
+/*
+ * Handle a fault on the vmalloc or module mapping area
+ */
+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);
+
+	/* 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(*pud) != pud_page(*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);
+	if (!pte_present(*pte) || pte_page(*pte) != pte_page(*pte_ref))
+		BUG();
+	__flush_tlb_all();
+	return 0;
+}
+
+int page_fault_trace = 0;
+int exception_trace = 1;
+
+/*
+ * This routine handles page faults.  It determines the address,
+ * and the problem, and then passes it off to one of the appropriate
+ * routines.
+ *
+ * error_code:
+ *	bit 0 == 0 means no page found, 1 means protection fault
+ *	bit 1 == 0 means read, 1 means write
+ *	bit 2 == 0 means kernel, 1 means user-mode
+ *      bit 3 == 1 means fault was an instruction fetch
+ */
+asmlinkage void 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;
+	siginfo_t info;
+
+#ifdef CONFIG_CHECKING
+	{ 
+		unsigned long gs; 
+		struct x8664_pda *pda = cpu_pda + stack_smp_processor_id(); 
+		rdmsrl(MSR_GS_BASE, gs); 
+		if (gs != (unsigned long)pda) { 
+			wrmsrl(MSR_GS_BASE, pda); 
+			printk("page_fault: wrong gs %lx expected %p\n", gs, pda);
+		}
+	}
+#endif
+
+	/* get the address */
+	__asm__("movq %%cr2,%0":"=r" (address));
+	if (notify_die(DIE_PAGE_FAULT, "page fault", regs, error_code, 14,
+					SIGSEGV) == 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); 
+
+	tsk = current;
+	mm = tsk->mm;
+	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 & 1) == 0.
+	 */
+	if (unlikely(address >= TASK_SIZE)) {
+		if (!(error_code & 5)) {
+			if (vmalloc_fault(address) < 0)
+				goto bad_area_nosemaphore;
+			return;
+		}
+		/*
+		 * Don't take the mm semaphore here. If we fixup a prefetch
+		 * fault we could otherwise deadlock.
+		 */
+		goto bad_area_nosemaphore;
+	}
+
+	if (unlikely(error_code & (1 << 3)))
+		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;
+
+ 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 occuring 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 & 4) == 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) {
+		// XXX: align red zone size with ABI 
+		if (address + 128 < 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 & 3) {
+		default:	/* 3: write, present */
+			/* fall through */
+		case 2:		/* write, not present */
+			if (!(vma->vm_flags & VM_WRITE))
+				goto bad_area;
+			write++;
+			break;
+		case 1:		/* read, present */
+			goto bad_area;
+		case 0:		/* read, not present */
+			if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
+				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.
+	 */
+	switch (handle_mm_fault(mm, vma, address, write)) {
+	case 1:
+		tsk->min_flt++;
+		break;
+	case 2:
+		tsk->maj_flt++;
+		break;
+	case 0:
+		goto do_sigbus;
+	default:
+		goto out_of_memory;
+	}
+
+	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:
+
+#ifdef CONFIG_IA32_EMULATION
+	/* 32bit vsyscall. map on demand. */
+	if (test_thread_flag(TIF_IA32) &&
+	    address >= VSYSCALL32_BASE && address < VSYSCALL32_END) {
+		if (map_syscall32(mm, address) < 0)
+			goto out_of_memory2;
+		return;
+	}
+#endif
+
+	/* User mode accesses just cause a SIGSEGV */
+	if (error_code & 4) {
+		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 (exception_trace && unhandled_signal(tsk, SIGSEGV)) {
+			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.
+ */
+
+	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);
+	printk("\n");
+	dump_pagetable(address);
+	__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(); 
+	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);
+out_of_memory2:
+	if (current->pid == 1) { 
+		yield();
+		goto again;
+	}
+	printk("VM: killing process %s\n", tsk->comm);
+	if (error_code & 4)
+		do_exit(SIGKILL);
+	goto no_context;
+
+do_sigbus:
+	up_read(&mm->mmap_sem);
+
+	/* Kernel mode? Handle exceptions or die */
+	if (!(error_code & 4))
+		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;
+}