X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fmips%2Fmm%2Ffault.c;h=4bcbbd25d754a63897d2207e8fb95fa0c7bf2ea2;hb=refs%2Fheads%2Fvserver;hp=820c3af0868a5846a15ee890e7d09b5079e47195;hpb=5273a3df6485dc2ad6aa7ddd441b9a21970f003b;p=linux-2.6.git

diff --git a/arch/mips/mm/fault.c b/arch/mips/mm/fault.c
index 820c3af08..4bcbbd25d 100644
--- a/arch/mips/mm/fault.c
+++ b/arch/mips/mm/fault.c
@@ -21,11 +21,11 @@
 #include <linux/module.h>
 
 #include <asm/branch.h>
-#include <asm/hardirq.h>
 #include <asm/mmu_context.h>
 #include <asm/system.h>
 #include <asm/uaccess.h>
 #include <asm/ptrace.h>
+#include <asm/highmem.h>		/* For VMALLOC_END */
 
 /*
  * This routine handles page faults.  It determines the address,
@@ -58,8 +58,12 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
 	 * only copy the information from the master page table,
 	 * nothing more.
 	 */
-	if (unlikely(address >= VMALLOC_START))
+	if (unlikely(address >= VMALLOC_START && address <= VMALLOC_END))
 		goto vmalloc_fault;
+#ifdef MODULE_START
+	if (unlikely(address >= MODULE_START && address < MODULE_END))
+		goto vmalloc_fault;
+#endif
 
 	/*
 	 * If we're in an interrupt or have no user
@@ -89,7 +93,7 @@ good_area:
 		if (!(vma->vm_flags & VM_WRITE))
 			goto bad_area;
 	} else {
-		if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
+		if (!(vma->vm_flags & (VM_READ | VM_WRITE | VM_EXEC)))
 			goto bad_area;
 	}
 
@@ -141,7 +145,7 @@ bad_area_nosemaphore:
 		info.si_signo = SIGSEGV;
 		info.si_errno = 0;
 		/* info.si_code has been set above */
-		info.si_addr = (void *) address;
+		info.si_addr = (void __user *) address;
 		force_sig_info(SIGSEGV, &info, tsk);
 		return;
 	}
@@ -157,7 +161,6 @@ no_context:
 	 * Oops. The kernel tried to access some bad page. We'll have to
 	 * terminate things with extreme prejudice.
 	 */
-
 	bust_spinlocks(1);
 
 	printk(KERN_ALERT "CPU %d Unable to handle kernel paging request at "
@@ -172,12 +175,13 @@ no_context:
  */
 out_of_memory:
 	up_read(&mm->mmap_sem);
-	if (tsk->pid == 1) {
+	if (is_init(tsk)) {
 		yield();
 		down_read(&mm->mmap_sem);
 		goto survive;
 	}
-	printk("VM: killing process %s\n", tsk->comm);
+	printk("VM: killing process %s(%d:#%u)\n",
+		tsk->comm, tsk->pid, tsk->xid);
 	if (user_mode(regs))
 		do_exit(SIGKILL);
 	goto no_context;
@@ -188,20 +192,28 @@ do_sigbus:
 	/* Kernel mode? Handle exceptions or die */
 	if (!user_mode(regs))
 		goto no_context;
-
+	else
 	/*
 	 * Send a sigbus, regardless of whether we were in kernel
 	 * or user mode.
 	 */
+#if 0
+		printk("do_page_fault() #3: sending SIGBUS to %s for "
+		       "invalid %s\n%0*lx (epc == %0*lx, ra == %0*lx)\n",
+		       tsk->comm,
+		       write ? "write access to" : "read access from",
+		       field, address,
+		       field, (unsigned long) regs->cp0_epc,
+		       field, (unsigned long) regs->regs[31]);
+#endif
 	tsk->thread.cp0_badvaddr = address;
 	info.si_signo = SIGBUS;
 	info.si_errno = 0;
 	info.si_code = BUS_ADRERR;
-	info.si_addr = (void *) address;
+	info.si_addr = (void __user *) address;
 	force_sig_info(SIGBUS, &info, tsk);
 
 	return;
-
 vmalloc_fault:
 	{
 		/*
@@ -213,6 +225,7 @@ vmalloc_fault:
 		 */
 		int offset = __pgd_offset(address);
 		pgd_t *pgd, *pgd_k;
+		pud_t *pud, *pud_k;
 		pmd_t *pmd, *pmd_k;
 		pte_t *pte_k;
 
@@ -223,8 +236,13 @@ vmalloc_fault:
 			goto no_context;
 		set_pgd(pgd, *pgd_k);
 
-		pmd = pmd_offset(pgd, address);
-		pmd_k = pmd_offset(pgd_k, address);
+		pud = pud_offset(pgd, address);
+		pud_k = pud_offset(pgd_k, address);
+		if (!pud_present(*pud_k))
+			goto no_context;
+
+		pmd = pmd_offset(pud, address);
+		pmd_k = pmd_offset(pud_k, address);
 		if (!pmd_present(*pmd_k))
 			goto no_context;
 		set_pmd(pmd, *pmd_k);