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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/arch/m68k/kernel/traps.c
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@@ -30,15 +30,15 @@
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 #include <linux/init.h>
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 #include <linux/ptrace.h>
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 #include <linux/kallsyms.h>
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+#include <linux/extable.h>
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 #include <asm/setup.h>
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 #include <asm/fpu.h>
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 #include <linux/uaccess.h>
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 #include <asm/traps.h>
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-#include <asm/pgalloc.h>
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 #include <asm/machdep.h>
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 #include <asm/siginfo.h>
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-
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+#include <asm/tlbflush.h>
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 static const char *vec_names[] = {
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 	[VEC_RESETSP]	= "RESET SP",
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@@ -431,7 +431,7 @@
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 			pr_err("BAD KERNEL BUSERR\n");
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 			die_if_kernel("Oops", &fp->ptregs,0);
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-			force_sig(SIGKILL, current);
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+			force_sig(SIGKILL);
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 			return;
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 		}
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 	} else {
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@@ -463,7 +463,7 @@
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 				 !(ssw & RW) ? "write" : "read", addr,
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 				 fp->ptregs.pc);
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 			die_if_kernel ("Oops", &fp->ptregs, buserr_type);
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-			force_sig (SIGBUS, current);
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+			force_sig (SIGBUS);
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 			return;
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 		}
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..
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@@ -493,7 +493,7 @@
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 			do_page_fault (&fp->ptregs, addr, 0);
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        } else {
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 		pr_debug("protection fault on insn access (segv).\n");
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-		force_sig (SIGSEGV, current);
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+		force_sig (SIGSEGV);
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        }
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 }
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 #else
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@@ -550,7 +550,8 @@
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 			errorcode |= 2;
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 		if (mmusr & (MMU_I | MMU_WP)) {
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-			if (ssw & 4) {
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+			/* We might have an exception table for this PC */
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+			if (ssw & 4 && !search_exception_tables(fp->ptregs.pc)) {
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 				pr_err("Data %s fault at %#010lx in %s (pc=%#lx)\n",
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 				       ssw & RW ? "read" : "write",
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 				       fp->un.fmtb.daddr,
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@@ -571,7 +572,7 @@
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 			       !(ssw & RW) ? "write" : "read", addr,
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 			       fp->ptregs.pc);
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 			die_if_kernel("Oops",&fp->ptregs,mmusr);
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-			force_sig(SIGSEGV, current);
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+			force_sig(SIGSEGV);
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 			return;
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 		} else {
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 #if 0
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@@ -598,7 +599,7 @@
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 #endif
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 			pr_debug("Unknown SIGSEGV - 1\n");
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 			die_if_kernel("Oops",&fp->ptregs,mmusr);
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-			force_sig(SIGSEGV, current);
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+			force_sig(SIGSEGV);
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 			return;
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 		}
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@@ -621,7 +622,7 @@
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 	buserr:
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 		pr_err("BAD KERNEL BUSERR\n");
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 		die_if_kernel("Oops",&fp->ptregs,0);
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-		force_sig(SIGKILL, current);
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+		force_sig(SIGKILL);
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 		return;
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 	}
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..
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@@ -660,7 +661,7 @@
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 			addr, fp->ptregs.pc);
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 		pr_debug("Unknown SIGSEGV - 2\n");
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 		die_if_kernel("Oops",&fp->ptregs,mmusr);
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-		force_sig(SIGSEGV, current);
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+		force_sig(SIGSEGV);
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 		return;
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 	}
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@@ -804,20 +805,20 @@
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 	default:
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 	  die_if_kernel("bad frame format",&fp->ptregs,0);
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 	  pr_debug("Unknown SIGSEGV - 4\n");
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-	  force_sig(SIGSEGV, current);
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+	  force_sig(SIGSEGV);
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 	}
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 }
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811
 
811
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 static int kstack_depth_to_print = 48;
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-void show_trace(unsigned long *stack)
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+static void show_trace(unsigned long *stack, const char *loglvl)
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 {
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 	unsigned long *endstack;
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 	unsigned long addr;
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 	int i;
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-	pr_info("Call Trace:");
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+	printk("%sCall Trace:", loglvl);
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 	addr = (unsigned long)stack + THREAD_SIZE - 1;
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 	endstack = (unsigned long *)(addr & -THREAD_SIZE);
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 	i = 0;
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@@ -846,7 +847,6 @@
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 void show_registers(struct pt_regs *regs)
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 {
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 	struct frame *fp = (struct frame *)regs;
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-	mm_segment_t old_fs = get_fs();
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 	u16 c, *cp;
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 	unsigned long addr;
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 	int i;
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@@ -916,13 +916,12 @@
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 	default:
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 		pr_cont("\n");
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 	}
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-	show_stack(NULL, (unsigned long *)addr);
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+	show_stack(NULL, (unsigned long *)addr, KERN_INFO);
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 	pr_info("Code:");
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-	set_fs(KERNEL_DS);
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 	cp = (u16 *)regs->pc;
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 	for (i = -8; i < 16; i++) {
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-		if (get_user(c, cp + i) && i >= 0) {
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+		if (get_kernel_nofault(c, cp + i) && i >= 0) {
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 			pr_cont(" Bad PC value.");
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 			break;
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 		}
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@@ -931,11 +930,11 @@
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 		else
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 			pr_cont(" <%04x>", c);
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 	}
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-	set_fs(old_fs);
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 	pr_cont("\n");
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 }
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-void show_stack(struct task_struct *task, unsigned long *stack)
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+void show_stack(struct task_struct *task, unsigned long *stack,
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+		const char *loglvl)
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 {
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 	unsigned long *p;
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 	unsigned long *endstack;
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@@ -949,7 +948,7 @@
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 	}
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 	endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);
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952
-	pr_info("Stack from %08lx:", (unsigned long)stack);
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+	printk("%sStack from %08lx:", loglvl, (unsigned long)stack);
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 	p = stack;
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 	for (i = 0; i < kstack_depth_to_print; i++) {
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 		if (p + 1 > endstack)
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@@ -959,7 +958,7 @@
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 		pr_cont(" %08lx", *p++);
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 	}
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 	pr_cont("\n");
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-	show_trace(stack);
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+	show_trace(stack, loglvl);
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 }
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 /*
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@@ -1127,7 +1126,7 @@
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 		addr = (void __user*) fp->un.fmtb.daddr;
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 		break;
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 	}
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-	force_sig_fault(sig, si_code, addr, current);
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+	force_sig_fault(sig, si_code, addr);
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 }
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 void die_if_kernel (char *str, struct pt_regs *fp, int nr)
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@@ -1139,7 +1138,7 @@
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 	pr_crit("%s: %08x\n", str, nr);
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 	show_registers(fp);
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 	add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
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-	do_exit(SIGSEGV);
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+	make_task_dead(SIGSEGV);
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 }
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 asmlinkage void set_esp0(unsigned long ssp)
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@@ -1159,6 +1158,6 @@
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 #ifdef CONFIG_M68KFPU_EMU
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 asmlinkage void fpemu_signal(int signal, int code, void *addr)
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 {
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-	force_sig_fault(signal, code, addr, current);
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+	force_sig_fault(signal, code, addr);
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 }
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 #endif