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![Linus Torvalds](/assets/img/avatar_default.png)
Pull force_sig() argument change from Eric Biederman: "A source of error over the years has been that force_sig has taken a task parameter when it is only safe to use force_sig with the current task. The force_sig function is built for delivering synchronous signals such as SIGSEGV where the userspace application caused a synchronous fault (such as a page fault) and the kernel responded with a signal. Because the name force_sig does not make this clear, and because the force_sig takes a task parameter the function force_sig has been abused for sending other kinds of signals over the years. Slowly those have been fixed when the oopses have been tracked down. This set of changes fixes the remaining abusers of force_sig and carefully rips out the task parameter from force_sig and friends making this kind of error almost impossible in the future" * 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (27 commits) signal/x86: Move tsk inside of CONFIG_MEMORY_FAILURE in do_sigbus signal: Remove the signal number and task parameters from force_sig_info signal: Factor force_sig_info_to_task out of force_sig_info signal: Generate the siginfo in force_sig signal: Move the computation of force into send_signal and correct it. signal: Properly set TRACE_SIGNAL_LOSE_INFO in __send_signal signal: Remove the task parameter from force_sig_fault signal: Use force_sig_fault_to_task for the two calls that don't deliver to current signal: Explicitly call force_sig_fault on current signal/unicore32: Remove tsk parameter from __do_user_fault signal/arm: Remove tsk parameter from __do_user_fault signal/arm: Remove tsk parameter from ptrace_break signal/nds32: Remove tsk parameter from send_sigtrap signal/riscv: Remove tsk parameter from do_trap signal/sh: Remove tsk parameter from force_sig_info_fault signal/um: Remove task parameter from send_sigtrap signal/x86: Remove task parameter from send_sigtrap signal: Remove task parameter from force_sig_mceerr signal: Remove task parameter from force_sig signal: Remove task parameter from force_sigsegv ...
471 lines
11 KiB
C
471 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* OpenRISC traps.c
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*
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* Linux architectural port borrowing liberally from similar works of
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* others. All original copyrights apply as per the original source
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* declaration.
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*
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* Modifications for the OpenRISC architecture:
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* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
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* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
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*
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* Here we handle the break vectors not used by the system call
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* mechanism, as well as some general stack/register dumping
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* things.
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*/
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/sched/debug.h>
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#include <linux/sched/task_stack.h>
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#include <linux/kernel.h>
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#include <linux/extable.h>
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#include <linux/kmod.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/ptrace.h>
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#include <linux/timer.h>
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#include <linux/mm.h>
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#include <linux/kallsyms.h>
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#include <linux/uaccess.h>
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#include <asm/io.h>
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#include <asm/pgtable.h>
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#include <asm/unwinder.h>
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#include <asm/sections.h>
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int kstack_depth_to_print = 0x180;
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int lwa_flag;
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unsigned long __user *lwa_addr;
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void print_trace(void *data, unsigned long addr, int reliable)
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{
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pr_emerg("[<%p>] %s%pS\n", (void *) addr, reliable ? "" : "? ",
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(void *) addr);
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}
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/* displays a short stack trace */
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void show_stack(struct task_struct *task, unsigned long *esp)
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{
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if (esp == NULL)
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esp = (unsigned long *)&esp;
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pr_emerg("Call trace:\n");
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unwind_stack(NULL, esp, print_trace);
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}
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void show_trace_task(struct task_struct *tsk)
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{
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/*
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* TODO: SysRq-T trace dump...
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*/
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}
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void show_registers(struct pt_regs *regs)
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{
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int i;
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int in_kernel = 1;
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unsigned long esp;
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esp = (unsigned long)(regs->sp);
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if (user_mode(regs))
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in_kernel = 0;
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printk("CPU #: %d\n"
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" PC: %08lx SR: %08lx SP: %08lx\n",
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smp_processor_id(), regs->pc, regs->sr, regs->sp);
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printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
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0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
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printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
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regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
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printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
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regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
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printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
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regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
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printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
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regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
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printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
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regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
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printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
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regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
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printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
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regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
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printk(" RES: %08lx oGPR11: %08lx\n",
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regs->gpr[11], regs->orig_gpr11);
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printk("Process %s (pid: %d, stackpage=%08lx)\n",
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current->comm, current->pid, (unsigned long)current);
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/*
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* When in-kernel, we also print out the stack and code at the
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* time of the fault..
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*/
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if (in_kernel) {
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printk("\nStack: ");
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show_stack(NULL, (unsigned long *)esp);
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printk("\nCode: ");
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if (regs->pc < PAGE_OFFSET)
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goto bad;
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for (i = -24; i < 24; i++) {
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unsigned char c;
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if (__get_user(c, &((unsigned char *)regs->pc)[i])) {
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bad:
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printk(" Bad PC value.");
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break;
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}
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if (i == 0)
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printk("(%02x) ", c);
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else
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printk("%02x ", c);
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}
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}
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printk("\n");
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}
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void nommu_dump_state(struct pt_regs *regs,
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unsigned long ea, unsigned long vector)
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{
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int i;
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unsigned long addr, stack = regs->sp;
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printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector);
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printk("CPU #: %d\n"
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" PC: %08lx SR: %08lx SP: %08lx\n",
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0, regs->pc, regs->sr, regs->sp);
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printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
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0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
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printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
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regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
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printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
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regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
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printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
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regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
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printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
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regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
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printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
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regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
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printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
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regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
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printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
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regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
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printk(" RES: %08lx oGPR11: %08lx\n",
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regs->gpr[11], regs->orig_gpr11);
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printk("Process %s (pid: %d, stackpage=%08lx)\n",
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((struct task_struct *)(__pa(current)))->comm,
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((struct task_struct *)(__pa(current)))->pid,
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(unsigned long)current);
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printk("\nStack: ");
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printk("Stack dump [0x%08lx]:\n", (unsigned long)stack);
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for (i = 0; i < kstack_depth_to_print; i++) {
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if (((long)stack & (THREAD_SIZE - 1)) == 0)
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break;
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stack++;
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printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4,
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*((unsigned long *)(__pa(stack))));
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}
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printk("\n");
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printk("Call Trace: ");
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i = 1;
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while (((long)stack & (THREAD_SIZE - 1)) != 0) {
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addr = *((unsigned long *)__pa(stack));
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stack++;
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if (kernel_text_address(addr)) {
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if (i && ((i % 6) == 0))
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printk("\n ");
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printk(" [<%08lx>]", addr);
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i++;
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}
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}
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printk("\n");
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printk("\nCode: ");
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for (i = -24; i < 24; i++) {
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unsigned char c;
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c = ((unsigned char *)(__pa(regs->pc)))[i];
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if (i == 0)
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printk("(%02x) ", c);
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else
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printk("%02x ", c);
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}
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printk("\n");
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}
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/* This is normally the 'Oops' routine */
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void die(const char *str, struct pt_regs *regs, long err)
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{
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console_verbose();
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printk("\n%s#: %04lx\n", str, err & 0xffff);
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show_registers(regs);
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#ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION
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printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n");
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/* shut down interrupts */
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local_irq_disable();
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__asm__ __volatile__("l.nop 1");
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do {} while (1);
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#endif
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do_exit(SIGSEGV);
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}
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/* This is normally the 'Oops' routine */
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void die_if_kernel(const char *str, struct pt_regs *regs, long err)
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{
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if (user_mode(regs))
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return;
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die(str, regs, err);
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}
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void unhandled_exception(struct pt_regs *regs, int ea, int vector)
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{
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printk("Unable to handle exception at EA =0x%x, vector 0x%x",
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ea, vector);
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die("Oops", regs, 9);
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}
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void __init trap_init(void)
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{
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/* Nothing needs to be done */
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}
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asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
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{
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force_sig_fault(SIGTRAP, TRAP_TRACE, (void __user *)address);
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regs->pc += 4;
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}
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asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
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{
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if (user_mode(regs)) {
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/* Send a SIGBUS */
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force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *)address);
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} else {
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printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
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show_registers(regs);
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die("Die:", regs, address);
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}
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}
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asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
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{
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if (user_mode(regs)) {
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/* Send a SIGBUS */
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force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address);
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} else { /* Kernel mode */
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printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
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show_registers(regs);
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die("Die:", regs, address);
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}
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}
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static inline int in_delay_slot(struct pt_regs *regs)
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{
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#ifdef CONFIG_OPENRISC_NO_SPR_SR_DSX
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/* No delay slot flag, do the old way */
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unsigned int op, insn;
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insn = *((unsigned int *)regs->pc);
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op = insn >> 26;
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switch (op) {
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case 0x00: /* l.j */
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case 0x01: /* l.jal */
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case 0x03: /* l.bnf */
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case 0x04: /* l.bf */
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case 0x11: /* l.jr */
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case 0x12: /* l.jalr */
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return 1;
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default:
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return 0;
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}
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#else
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return mfspr(SPR_SR) & SPR_SR_DSX;
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#endif
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}
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static inline void adjust_pc(struct pt_regs *regs, unsigned long address)
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{
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int displacement;
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unsigned int rb, op, jmp;
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if (unlikely(in_delay_slot(regs))) {
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/* In delay slot, instruction at pc is a branch, simulate it */
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jmp = *((unsigned int *)regs->pc);
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displacement = sign_extend32(((jmp) & 0x3ffffff) << 2, 27);
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rb = (jmp & 0x0000ffff) >> 11;
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op = jmp >> 26;
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switch (op) {
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case 0x00: /* l.j */
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regs->pc += displacement;
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return;
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case 0x01: /* l.jal */
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regs->pc += displacement;
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regs->gpr[9] = regs->pc + 8;
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return;
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case 0x03: /* l.bnf */
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if (regs->sr & SPR_SR_F)
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regs->pc += 8;
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else
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regs->pc += displacement;
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return;
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case 0x04: /* l.bf */
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if (regs->sr & SPR_SR_F)
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regs->pc += displacement;
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else
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regs->pc += 8;
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return;
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case 0x11: /* l.jr */
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regs->pc = regs->gpr[rb];
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return;
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case 0x12: /* l.jalr */
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regs->pc = regs->gpr[rb];
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regs->gpr[9] = regs->pc + 8;
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return;
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default:
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break;
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}
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} else {
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regs->pc += 4;
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}
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}
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static inline void simulate_lwa(struct pt_regs *regs, unsigned long address,
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unsigned int insn)
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{
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unsigned int ra, rd;
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unsigned long value;
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unsigned long orig_pc;
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long imm;
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const struct exception_table_entry *entry;
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orig_pc = regs->pc;
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adjust_pc(regs, address);
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ra = (insn >> 16) & 0x1f;
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rd = (insn >> 21) & 0x1f;
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imm = (short)insn;
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lwa_addr = (unsigned long __user *)(regs->gpr[ra] + imm);
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if ((unsigned long)lwa_addr & 0x3) {
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do_unaligned_access(regs, address);
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return;
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}
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if (get_user(value, lwa_addr)) {
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if (user_mode(regs)) {
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force_sig(SIGSEGV);
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return;
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}
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if ((entry = search_exception_tables(orig_pc))) {
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regs->pc = entry->fixup;
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return;
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}
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/* kernel access in kernel space, load it directly */
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value = *((unsigned long *)lwa_addr);
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}
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lwa_flag = 1;
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regs->gpr[rd] = value;
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}
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static inline void simulate_swa(struct pt_regs *regs, unsigned long address,
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unsigned int insn)
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{
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unsigned long __user *vaddr;
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unsigned long orig_pc;
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unsigned int ra, rb;
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long imm;
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const struct exception_table_entry *entry;
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orig_pc = regs->pc;
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adjust_pc(regs, address);
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ra = (insn >> 16) & 0x1f;
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rb = (insn >> 11) & 0x1f;
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imm = (short)(((insn & 0x2200000) >> 10) | (insn & 0x7ff));
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vaddr = (unsigned long __user *)(regs->gpr[ra] + imm);
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if (!lwa_flag || vaddr != lwa_addr) {
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regs->sr &= ~SPR_SR_F;
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return;
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}
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if ((unsigned long)vaddr & 0x3) {
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do_unaligned_access(regs, address);
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return;
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}
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if (put_user(regs->gpr[rb], vaddr)) {
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if (user_mode(regs)) {
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force_sig(SIGSEGV);
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return;
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}
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if ((entry = search_exception_tables(orig_pc))) {
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regs->pc = entry->fixup;
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return;
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}
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/* kernel access in kernel space, store it directly */
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*((unsigned long *)vaddr) = regs->gpr[rb];
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}
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lwa_flag = 0;
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regs->sr |= SPR_SR_F;
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}
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#define INSN_LWA 0x1b
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#define INSN_SWA 0x33
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asmlinkage void do_illegal_instruction(struct pt_regs *regs,
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unsigned long address)
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{
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unsigned int op;
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unsigned int insn = *((unsigned int *)address);
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op = insn >> 26;
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switch (op) {
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case INSN_LWA:
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simulate_lwa(regs, address, insn);
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return;
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case INSN_SWA:
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simulate_swa(regs, address, insn);
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return;
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default:
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break;
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}
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if (user_mode(regs)) {
|
|
/* Send a SIGILL */
|
|
force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)address);
|
|
} else { /* Kernel mode */
|
|
printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
|
|
address);
|
|
show_registers(regs);
|
|
die("Die:", regs, address);
|
|
}
|
|
}
|