12 files changed, 15 insertions, 76 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 05b057dca4a7..5db2117ae288 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -20,6 +20,7 @@ config X86_64
 ### Arch settings
 config X86
         def_bool y
+        select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
         select HAVE_AOUT if X86_32
         select HAVE_UNSTABLE_SCHED_CLOCK
         select ARCH_SUPPORTS_NUMA_BALANCING
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index 16f738385dcb..c198b7e13e7b 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -292,20 +292,6 @@ config OPTIMIZE_INLINING
 
           If unsure, say N.
 
-config DEBUG_STRICT_USER_COPY_CHECKS
-        bool "Strict copy size checks"
-        depends on DEBUG_KERNEL && !TRACE_BRANCH_PROFILING
-        ---help---
-          Enabling this option turns a certain set of sanity checks for user
-          copy operations into compile time failures.
-
-          The copy_from_user() etc checks are there to help test if there
-          are sufficient security checks on the length argument of
-          the copy operation, by having gcc prove that the argument is
-          within bounds.
-
-          If unsure, or if you run an older (pre 4.4) gcc, say N.
-
 config DEBUG_NMI_SELFTEST
         bool "NMI Selftest"
         depends on DEBUG_KERNEL && X86_LOCAL_APIC
diff --git a/arch/x86/ia32/ia32_aout.c b/arch/x86/ia32/ia32_aout.c
index 03abf9b70011..81e94d972f1b 100644
--- a/arch/x86/ia32/ia32_aout.c
+++ b/arch/x86/ia32/ia32_aout.c
@@ -162,7 +162,6 @@ static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file,
         fs = get_fs();
         set_fs(KERNEL_DS);
         has_dumped = 1;
-        current->flags |= PF_DUMPCORE;
         strncpy(dump.u_comm, current->comm, sizeof(current->comm));
         dump.u_ar0 = offsetof(struct user32, regs);
         dump.signal = signr;
diff --git a/arch/x86/include/asm/bug.h b/arch/x86/include/asm/bug.h
index 11e1152222d0..2f03ff018d36 100644
--- a/arch/x86/include/asm/bug.h
+++ b/arch/x86/include/asm/bug.h
@@ -37,7 +37,4 @@ do {								\
 
 #include <asm-generic/bug.h>
 
-
-extern void show_regs_common(void);
-
 #endif /* _ASM_X86_BUG_H */
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index c8797d55b245..deb6421c9e69 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -176,26 +176,20 @@ void show_trace(struct task_struct *task, struct pt_regs *regs,
 
 void show_stack(struct task_struct *task, unsigned long *sp)
 {
-        show_stack_log_lvl(task, NULL, sp, 0, "");
-}
-
-/*
- * The architecture-independent dump_stack generator
- */
-void dump_stack(void)
-{
-        unsigned long bp;
+        unsigned long bp = 0;
         unsigned long stack;
 
-        bp = stack_frame(current, NULL);
-        printk("Pid: %d, comm: %.20s %s %s %.*s\n",
-                current->pid, current->comm, print_tainted(),
-                init_utsname()->release,
-                (int)strcspn(init_utsname()->version, " "),
-                init_utsname()->version);
-        show_trace(NULL, NULL, &stack, bp);
+        /*
+         * Stack frames below this one aren't interesting.  Don't show them
+         * if we're printing for %current.
+         */
+        if (!sp && (!task || task == current)) {
+                sp = &stack;
+                bp = stack_frame(current, NULL);
+        }
+
+        show_stack_log_lvl(task, NULL, sp, bp, "");
 }
-EXPORT_SYMBOL(dump_stack);
 
 static arch_spinlock_t die_lock = __ARCH_SPIN_LOCK_UNLOCKED;
 static int die_owner = -1;
diff --git a/arch/x86/kernel/dumpstack_32.c b/arch/x86/kernel/dumpstack_32.c
index 1038a417ea53..f2a1770ca176 100644
--- a/arch/x86/kernel/dumpstack_32.c
+++ b/arch/x86/kernel/dumpstack_32.c
@@ -86,11 +86,9 @@ void show_regs(struct pt_regs *regs)
 {
         int i;
 
+        show_regs_print_info(KERN_EMERG);
         __show_regs(regs, !user_mode_vm(regs));
 
-        pr_emerg("Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)\n",
-                 TASK_COMM_LEN, current->comm, task_pid_nr(current),
-                 current_thread_info(), current, task_thread_info(current));
         /*
          * When in-kernel, we also print out the stack and code at the
          * time of the fault..
diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c
index b653675d5288..addb207dab92 100644
--- a/arch/x86/kernel/dumpstack_64.c
+++ b/arch/x86/kernel/dumpstack_64.c
@@ -249,14 +249,10 @@ void show_regs(struct pt_regs *regs)
 {
         int i;
         unsigned long sp;
-        const int cpu = smp_processor_id();
-        struct task_struct *cur = current;
 
         sp = regs->sp;
-        printk("CPU %d ", cpu);
+        show_regs_print_info(KERN_DEFAULT);
         __show_regs(regs, 1);
-        printk(KERN_DEFAULT "Process %s (pid: %d, threadinfo %p, task %p)\n",
-               cur->comm, cur->pid, task_thread_info(cur), cur);
 
         /*
          * When in-kernel, we also print out the stack and code at the
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 14fcf55a5c5b..607af0d4d5ef 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -121,30 +121,6 @@ void exit_thread(void)
         drop_fpu(me);
 }
 
-void show_regs_common(void)
-{
-        const char *vendor, *product, *board;
-
-        vendor = dmi_get_system_info(DMI_SYS_VENDOR);
-        if (!vendor)
-                vendor = "";
-        product = dmi_get_system_info(DMI_PRODUCT_NAME);
-        if (!product)
-                product = "";
-
-        /* Board Name is optional */
-        board = dmi_get_system_info(DMI_BOARD_NAME);
-
-        printk(KERN_DEFAULT "Pid: %d, comm: %.20s %s %s %.*s %s %s%s%s\n",
-               current->pid, current->comm, print_tainted(),
-               init_utsname()->release,
-               (int)strcspn(init_utsname()->version, " "),
-               init_utsname()->version,
-               vendor, product,
-               board ? "/" : "",
-               board ? board : "");
-}
-
 void flush_thread(void)
 {
         struct task_struct *tsk = current;
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index b5a8905785e6..7305f7dfc7ab 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -84,8 +84,6 @@ void __show_regs(struct pt_regs *regs, int all)
                 savesegment(gs, gs);
         }
 
-        show_regs_common();
-
         printk(KERN_DEFAULT "EIP: %04x:[<%08lx>] EFLAGS: %08lx CPU: %d\n",
                         (u16)regs->cs, regs->ip, regs->flags,
                         smp_processor_id());
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 0f49677da51e..355ae06dbf94 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -62,7 +62,6 @@ void __show_regs(struct pt_regs *regs, int all)
         unsigned int fsindex, gsindex;
         unsigned int ds, cs, es;
 
-        show_regs_common();
         printk(KERN_DEFAULT "RIP: %04lx:[<%016lx>] ", regs->cs & 0xffff, regs->ip);
         printk_address(regs->ip, 1);
         printk(KERN_DEFAULT "RSP: %04lx:%016lx  EFLAGS: %08lx\n", regs->ss,
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 4689855c2f8a..56f7fcfe7fa2 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -996,6 +996,7 @@ void __init setup_arch(char **cmdline_p)
                 efi_init();
 
         dmi_scan_machine();
+        dmi_set_dump_stack_arch_desc();
 
         /*
          * VMware detection requires dmi to be available, so this
diff --git a/arch/x86/lib/usercopy_32.c b/arch/x86/lib/usercopy_32.c
index f0312d746402..3eb18acd0e40 100644
--- a/arch/x86/lib/usercopy_32.c
+++ b/arch/x86/lib/usercopy_32.c
@@ -689,9 +689,3 @@ _copy_from_user(void *to, const void __user *from, unsigned long n)
         return n;
 }
 EXPORT_SYMBOL(_copy_from_user);
-
-void copy_from_user_overflow(void)
-{
-        WARN(1, "Buffer overflow detected!\n");
-}
-EXPORT_SYMBOL(copy_from_user_overflow);