Merge branch 'linus' of master.kernel.org:/pub/scm/linux/kernel/git/perex/alsa

[sfrench/cifs-2.6.git] / arch / x86_64 / mm / fault.c

diff --git a/arch/x86_64/mm/fault.c b/arch/x86_64/mm/fault.c
index ac8ea66ccb94365e4f1b2e03d18e3bdf3ae5f5e0..6ada7231f3abd11953e1bdd89c4101eac9ebe8db 100644 (file)
--- a/arch/x86_64/mm/fault.c
+++ b/arch/x86_64/mm/fault.c
@@ -23,9 +23,9 @@
 #include <linux/compiler.h>
 #include <linux/module.h>
 #include <linux/kprobes.h>
+#include <linux/uaccess.h>
 
 #include <asm/system.h>
-#include <asm/uaccess.h>
 #include <asm/pgalloc.h>
 #include <asm/smp.h>
 #include <asm/tlbflush.h>
@@ -40,8 +40,7 @@
 #define PF_RSVD        (1<<3)
 #define PF_INSTR       (1<<4)
 
-#ifdef CONFIG_KPROBES
-ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);
+static ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);
 
 /* Hook to register for page fault notifications */
 int register_page_fault_notifier(struct notifier_block *nb)
@@ -49,51 +48,25 @@ 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(enum die_val val, const char *str,
-                       struct pt_regs *regs, long err, int trap, int sig)
+static inline int notify_page_fault(struct pt_regs *regs, long err)
 {
        struct die_args args = {
                .regs = regs,
-               .str = str,
+               .str = "page fault",
                .err = err,
-               .trapnr = trap,
-               .signr = sig
+               .trapnr = 14,
+               .signr = SIGSEGV
        };
-       return atomic_notifier_call_chain(&notify_page_fault_chain, val, &args);
-}
-#else
-static inline int notify_page_fault(enum die_val val, const char *str,
-                       struct pt_regs *regs, long err, int trap, int sig)
-{
-       return NOTIFY_DONE;
-}
-#endif
-
-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;
-       }
+       return atomic_notifier_call_chain(&notify_page_fault_chain,
+                                         DIE_PAGE_FAULT, &args);
 }
 
 /* Sometimes the CPU reports invalid exceptions on prefetch.
@@ -111,7 +84,7 @@ static noinline int is_prefetch(struct pt_regs *regs, unsigned long addr,
        if (error_code & PF_INSTR)
                return 0;
        
-       instr = (unsigned char *)convert_rip_to_linear(current, regs);
+       instr = (unsigned char __user *)convert_rip_to_linear(current, regs);
        max_instr = instr + 15;
 
        if (user_mode(regs) && instr >= (unsigned char *)TASK_SIZE)
@@ -122,7 +95,7 @@ static noinline int is_prefetch(struct pt_regs *regs, unsigned long addr,
                unsigned char instr_hi;
                unsigned char instr_lo;
 
-               if (__get_user(opcode, instr))
+               if (probe_kernel_address(instr, opcode))
                        break; 
 
                instr_hi = opcode & 0xf0; 
@@ -160,7 +133,7 @@ static noinline int is_prefetch(struct pt_regs *regs, unsigned long addr,
                case 0x00:
                        /* Prefetch instruction is 0x0F0D or 0x0F18 */
                        scan_more = 0;
-                       if (__get_user(opcode, instr)) 
+                       if (probe_kernel_address(instr, opcode))
                                break;
                        prefetch = (instr_lo == 0xF) &&
                                (opcode == 0x0D || opcode == 0x18);
@@ -176,7 +149,7 @@ static noinline int is_prefetch(struct pt_regs *regs, unsigned long addr,
 static int bad_address(void *p) 
 { 
        unsigned long dummy;
-       return __get_user(dummy, (unsigned long *)p);
+       return probe_kernel_address((unsigned long *)p, dummy);
 } 
 
 void dump_pagetable(unsigned long address)
@@ -250,7 +223,7 @@ static int is_errata93(struct pt_regs *regs, unsigned long address)
 
 int unhandled_signal(struct task_struct *tsk, int sig)
 {
-       if (tsk->pid == 1)
+       if (is_init(tsk))
                return 1;
        if (tsk->ptrace & PT_PTRACED)
                return 0;
@@ -299,7 +272,7 @@ static int vmalloc_fault(unsigned long address)
        if (pgd_none(*pgd))
                set_pgd(pgd, *pgd_ref);
        else
-               BUG_ON(pgd_page(*pgd) != pgd_page(*pgd_ref));
+               BUG_ON(pgd_page_vaddr(*pgd) != pgd_page_vaddr(*pgd_ref));
 
        /* Below here mismatches are bugs because these lower tables
           are shared */
@@ -308,7 +281,7 @@ static int vmalloc_fault(unsigned long 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))
+       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);
@@ -382,8 +355,7 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
                        if (vmalloc_fault(address) >= 0)
                                return;
                }
-               if (notify_page_fault(DIE_PAGE_FAULT, "page fault", regs, error_code, 14,
-                                               SIGSEGV) == NOTIFY_STOP)
+               if (notify_page_fault(regs, error_code) == NOTIFY_STOP)
                        return;
                /*
                 * Don't take the mm semaphore here. If we fixup a prefetch
@@ -392,8 +364,7 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
                goto bad_area_nosemaphore;
        }
 
-       if (notify_page_fault(DIE_PAGE_FAULT, "page fault", regs, error_code, 14,
-                                       SIGSEGV) == NOTIFY_STOP)
+       if (notify_page_fault(regs, error_code) == NOTIFY_STOP)
                return;
 
        if (likely(regs->eflags & X86_EFLAGS_IF))
@@ -470,7 +441,7 @@ good_area:
                case PF_PROT:           /* read, present */
                        goto bad_area;
                case 0:                 /* read, not present */
-                       if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
+                       if (!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)))
                                goto bad_area;
        }
 
@@ -586,7 +557,7 @@ no_context:
  */
 out_of_memory:
        up_read(&mm->mmap_sem);
-       if (current->pid == 1) { 
+       if (is_init(current)) {
                yield();
                goto again;
        }
@@ -641,7 +612,7 @@ void vmalloc_sync_all(void)
                                if (pgd_none(*pgd))
                                        set_pgd(pgd, *pgd_ref);
                                else
-                                       BUG_ON(pgd_page(*pgd) != pgd_page(*pgd_ref));
+                                       BUG_ON(pgd_page_vaddr(*pgd) != pgd_page_vaddr(*pgd_ref));
                        }
                        spin_unlock(&pgd_lock);
                        set_bit(pgd_index(address), insync);