Merge branch 'linus' into stackprotector

[linux-2.6-omap-h63xx.git] / arch / x86 / mm / fault.c

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 4152d3c3b13801c5dc2854ae614ebbba24263a4d..4c056b5d6a956712691748f31b5bbbae4f4b8800 100644 (file)
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -26,6 +26,7 @@
 #include <linux/kprobes.h>
 #include <linux/uaccess.h>
 #include <linux/kdebug.h>
+#include <linux/magic.h>
 
 #include <asm/system.h>
 #include <asm/desc.h>
@@ -393,7 +394,7 @@ static void show_fault_oops(struct pt_regs *regs, unsigned long error_code,
                if (pte && pte_present(*pte) && !pte_exec(*pte))
                        printk(KERN_CRIT "kernel tried to execute "
                                "NX-protected page - exploit attempt? "
-                               "(uid: %d)\n", current->uid);
+                               "(uid: %d)\n", current_uid());
        }
 #endif
 
@@ -413,6 +414,7 @@ static noinline void pgtable_bad(unsigned long address, struct pt_regs *regs,
                                 unsigned long error_code)
 {
        unsigned long flags = oops_begin();
+       int sig = SIGKILL;
        struct task_struct *tsk;
 
        printk(KERN_ALERT "%s: Corrupted page table at address %lx\n",
@@ -423,8 +425,8 @@ static noinline void pgtable_bad(unsigned long address, struct pt_regs *regs,
        tsk->thread.trap_no = 14;
        tsk->thread.error_code = error_code;
        if (__die("Bad pagetable", regs, error_code))
-               regs = NULL;
-       oops_end(flags, regs, SIGKILL);
+               sig = 0;
+       oops_end(flags, regs, sig);
 }
 #endif
 
@@ -588,8 +590,11 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code)
        unsigned long address;
        int write, si_code;
        int fault;
+       unsigned long *stackend;
+
 #ifdef CONFIG_X86_64
        unsigned long flags;
+       int sig;
 #endif
 
        tsk = current;
@@ -840,6 +845,10 @@ no_context:
 
        show_fault_oops(regs, error_code, address);
 
+       stackend = end_of_stack(tsk);
+       if (*stackend != STACK_END_MAGIC)
+               printk(KERN_ALERT "Thread overran stack, or stack corrupted\n");
+
        tsk->thread.cr2 = address;
        tsk->thread.trap_no = 14;
        tsk->thread.error_code = error_code;
@@ -849,11 +858,12 @@ no_context:
        bust_spinlocks(0);
        do_exit(SIGKILL);
 #else
+       sig = SIGKILL;
        if (__die("Oops", regs, error_code))
-               regs = NULL;
+               sig = 0;
        /* Executive summary in case the body of the oops scrolled away */
        printk(KERN_EMERG "CR2: %016lx\n", address);
-       oops_end(flags, regs, SIGKILL);
+       oops_end(flags, regs, sig);
 #endif
 
 /*