- patches.apparmor/remove_suid_new_case_in_2.6.22.diff: Merge fix.

[linux-flexiantxendom0-3.2.10.git] / arch / arm / kernel / traps.c

diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 2409560..10ff36e 100644 (file)
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -16,7 +16,6 @@
 #include <linux/signal.h>
 #include <linux/spinlock.h>
 #include <linux/personality.h>
-#include <linux/ptrace.h>
 #include <linux/kallsyms.h>
 #include <linux/delay.h>
 #include <linux/init.h>
@@ -45,7 +44,18 @@ static int __init user_debug_setup(char *str)
 __setup("user_debug=", user_debug_setup);
 #endif
 
-void dump_backtrace_entry(unsigned long where, unsigned long from)
+static void dump_mem(const char *str, unsigned long bottom, unsigned long top);
+
+static inline int in_exception_text(unsigned long ptr)
+{
+       extern char __exception_text_start[];
+       extern char __exception_text_end[];
+
+       return ptr >= (unsigned long)&__exception_text_start &&
+              ptr < (unsigned long)&__exception_text_end;
+}
+
+void dump_backtrace_entry(unsigned long where, unsigned long from, unsigned long frame)
 {
 #ifdef CONFIG_KALLSYMS
        printk("[<%08lx>] ", where);
@@ -55,6 +65,9 @@ void dump_backtrace_entry(unsigned long where, unsigned long from)
 #else
        printk("Function entered at [<%08lx>] from [<%08lx>]\n", where, from);
 #endif
+
+       if (in_exception_text(where))
+               dump_mem("Exception stack", frame + 4, frame + 4 + sizeof(struct pt_regs));
 }
 
 /*
@@ -232,8 +245,8 @@ NORET_TYPE void die(const char *str, struct pt_regs *regs, int err)
        do_exit(SIGSEGV);
 }
 
-void notify_die(const char *str, struct pt_regs *regs, struct siginfo *info,
-               unsigned long err, unsigned long trap)
+void arm_notify_die(const char *str, struct pt_regs *regs,
+               struct siginfo *info, unsigned long err, unsigned long trap)
 {
        if (user_mode(regs)) {
                current->thread.error_code = err;
@@ -266,13 +279,14 @@ void unregister_undef_hook(struct undef_hook *hook)
        spin_unlock_irqrestore(&undef_lock, flags);
 }
 
-asmlinkage void do_undefinstr(struct pt_regs *regs)
+asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
 {
        unsigned int correction = thumb_mode(regs) ? 2 : 4;
        unsigned int instr;
        struct undef_hook *hook;
        siginfo_t info;
        void __user *pc;
+       unsigned long flags;
 
        /*
         * According to the ARM ARM, PC is 2 or 4 bytes ahead,
@@ -291,7 +305,7 @@ asmlinkage void do_undefinstr(struct pt_regs *regs)
                get_user(instr, (u32 __user *)pc);
        }
 
-       spin_lock_irq(&undef_lock);
+       spin_lock_irqsave(&undef_lock, flags);
        list_for_each_entry(hook, &undef_hook, node) {
                if ((instr & hook->instr_mask) == hook->instr_val &&
                    (regs->ARM_cpsr & hook->cpsr_mask) == hook->cpsr_val) {
@@ -301,7 +315,7 @@ asmlinkage void do_undefinstr(struct pt_regs *regs)
                        }
                }
        }
-       spin_unlock_irq(&undef_lock);
+       spin_unlock_irqrestore(&undef_lock, flags);
 
 #ifdef CONFIG_DEBUG_USER
        if (user_debug & UDBG_UNDEFINED) {
@@ -316,7 +330,7 @@ asmlinkage void do_undefinstr(struct pt_regs *regs)
        info.si_code  = ILL_ILLOPC;
        info.si_addr  = pc;
 
-       notify_die("Oops - undefined instruction", regs, &info, 0, 6);
+       arm_notify_die("Oops - undefined instruction", regs, &info, 0, 6);
 }
 
 asmlinkage void do_unexp_fiq (struct pt_regs *regs)
@@ -370,7 +384,7 @@ static int bad_syscall(int n, struct pt_regs *regs)
        info.si_addr  = (void __user *)instruction_pointer(regs) -
                         (thumb_mode(regs) ? 2 : 4);
 
-       notify_die("Oops - bad syscall", regs, &info, n, 0);
+       arm_notify_die("Oops - bad syscall", regs, &info, n, 0);
 
        return regs->ARM_r0;
 }
@@ -414,7 +428,7 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs)
                info.si_code  = SEGV_MAPERR;
                info.si_addr  = NULL;
 
-               notify_die("branch through zero", regs, &info, 0, 0);
+               arm_notify_die("branch through zero", regs, &info, 0, 0);
                return 0;
 
        case NR(breakpoint): /* SWI BREAK_POINT */
@@ -550,7 +564,7 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs)
        info.si_addr  = (void __user *)instruction_pointer(regs) -
                         (thumb_mode(regs) ? 2 : 4);
 
-       notify_die("Oops - bad syscall(2)", regs, &info, no, 0);
+       arm_notify_die("Oops - bad syscall(2)", regs, &info, no, 0);
        return 0;
 }
 
@@ -624,7 +638,7 @@ baddataabort(int code, unsigned long instr, struct pt_regs *regs)
        info.si_code  = ILL_ILLOPC;
        info.si_addr  = (void __user *)addr;
 
-       notify_die("unknown data abort code", regs, &info, instr, 0);
+       arm_notify_die("unknown data abort code", regs, &info, instr, 0);
 }
 
 void __attribute__((noreturn)) __bug(const char *file, int line)