parisc: fix kernel crash when unwinding a userspace process

Any user on existing parisc 32- and 64bit-kernels can easily crash
the kernel and as such enforce a DSO.
A simple testcase is available here:
        http://gsyprf10.external.hp.com/~deller/crash.tgz

The problem is introduced by the fact, that the handle_interruption()
crash handler calls the show_regs() function, which in turn tries to
unwind the stack by calling parisc_show_stack().  Since the stack contains
userspace addresses, a try to unwind the stack is dangerous and useless
and leads to the crash.

The fix is trivial: For userspace processes
a) avoid to unwind the stack, and
b) avoid to resolve userspace addresses to kernel symbol names.

While touching this code, I converted print_symbol() to %pS
printk formats and made parisc_show_stack() static.

An initial patch for this was written by Kyle McMartin back in August:
http://marc.info/?l=linux-parisc&m=121805168830283&w=2

Compile and run-tested with a 64bit parisc kernel.

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: Grant Grundler <grundler@parisc-linux.org>
Cc: Matthew Wilcox <matthew@wil.cx>
Cc: <stable@kernel.org>		[2.6.25.x, 2.6.26.x, 2.6.27.x, earlier...]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>

1 files changed, 21 insertions, 22 deletions

diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c
index 675f1d098f05..4c771cd580ec 100644
--- a/arch/parisc/kernel/traps.c
+++ b/arch/parisc/kernel/traps.c
@@ -24,7 +24,6 @@
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/console.h>
-#include <linux/kallsyms.h>
 #include <linux/bug.h>
 
 #include <asm/assembly.h>
@@ -51,7 +50,7 @@
 DEFINE_SPINLOCK(pa_dbit_lock);
 #endif
 
-void parisc_show_stack(struct task_struct *t, unsigned long *sp,
+static void parisc_show_stack(struct task_struct *task, unsigned long *sp,
         struct pt_regs *regs);
 
 static int printbinary(char *buf, unsigned long x, int nbits)
@@ -121,18 +120,19 @@ static void print_fr(char *level, struct pt_regs *regs)
 
 void show_regs(struct pt_regs *regs)
 {
-        int i;
+        int i, user;
         char *level;
         unsigned long cr30, cr31;
 
-        level = user_mode(regs) ? KERN_DEBUG : KERN_CRIT;
+        user = user_mode(regs);
+        level = user ? KERN_DEBUG : KERN_CRIT;
 
         print_gr(level, regs);
 
         for (i = 0; i < 8; i += 4)
                 PRINTREGS(level, regs->sr, "sr", RFMT, i);
 
-        if (user_mode(regs))
+        if (user)
                 print_fr(level, regs);
 
         cr30 = mfctl(30);
@@ -145,14 +145,18 @@ void show_regs(struct pt_regs *regs)
         printk("%s CPU: %8d   CR30: " RFMT " CR31: " RFMT "\n",
                level, current_thread_info()->cpu, cr30, cr31);
         printk("%s ORIG_R28: " RFMT "\n", level, regs->orig_r28);
-        printk(level);
-        print_symbol(" IAOQ[0]: %s\n", regs->iaoq[0]);
-        printk(level);
-        print_symbol(" IAOQ[1]: %s\n", regs->iaoq[1]);
-        printk(level);
-        print_symbol(" RP(r2): %s\n", regs->gr[2]);
-
-        parisc_show_stack(current, NULL, regs);
+
+        if (user) {
+                printk("%s IAOQ[0]: " RFMT "\n", level, regs->iaoq[0]);
+                printk("%s IAOQ[1]: " RFMT "\n", level, regs->iaoq[1]);
+                printk("%s RP(r2): " RFMT "\n", level, regs->gr[2]);
+        } else {
+                printk("%s IAOQ[0]: %pS\n", level, (void *) regs->iaoq[0]);
+                printk("%s IAOQ[1]: %pS\n", level, (void *) regs->iaoq[1]);
+                printk("%s RP(r2): %pS\n", level, (void *) regs->gr[2]);
+
+                parisc_show_stack(current, NULL, regs);
+        }
 }
 
 
@@ -173,20 +177,15 @@ static void do_show_stack(struct unwind_frame_info *info)
                         break;
 
                 if (__kernel_text_address(info->ip)) {
-                        printk("%s [<" RFMT ">] ", (i&0x3)==1 ? KERN_CRIT : "", info->ip);
-#ifdef CONFIG_KALLSYMS
-                        print_symbol("%s\n", info->ip);
-#else
-                        if ((i & 0x03) == 0)
-                                printk("\n");
-#endif
+                        printk(KERN_CRIT " [<" RFMT ">] %pS\n",
+                                info->ip, (void *) info->ip);
                         i++;
                 }
         }
-        printk("\n");
+        printk(KERN_CRIT "\n");
 }
 
-void parisc_show_stack(struct task_struct *task, unsigned long *sp,
+static void parisc_show_stack(struct task_struct *task, unsigned long *sp,
         struct pt_regs *regs)
 {
         struct unwind_frame_info info;