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2975e4a282
Use READ_ONCE_NOCHECK() when reading the stack to prevent KASAN splats
when dump_stack() is used.
Fixes: 5b301409e8 ("UML: add support for KASAN under x86_64")
Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Copyright (C) 2013 Richard Weinberger <richrd@nod.at>
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*/
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#include <linux/kallsyms.h>
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#include <linux/kernel.h>
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#include <linux/module.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 <asm/sysrq.h>
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#include <asm/stacktrace.h>
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#include <os.h>
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static void _print_addr(void *data, unsigned long address, int reliable)
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{
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const char *loglvl = data;
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printk("%s [<%08lx>] %s%pS\n", loglvl, address, reliable ? "" : "? ",
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(void *)address);
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}
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static const struct stacktrace_ops stackops = {
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.address = _print_addr
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};
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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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struct pt_regs *segv_regs = current->thread.segv_regs;
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int i;
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if (!segv_regs && os_is_signal_stack()) {
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pr_err("Received SIGSEGV in SIGSEGV handler,"
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" aborting stack trace!\n");
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return;
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}
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if (!stack)
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stack = get_stack_pointer(task, segv_regs);
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printk("%sStack:\n", loglvl);
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for (i = 0; i < 3 * STACKSLOTS_PER_LINE; i++) {
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if (kstack_end(stack))
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break;
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if (i && ((i % STACKSLOTS_PER_LINE) == 0))
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pr_cont("\n");
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pr_cont(" %08lx", READ_ONCE_NOCHECK(*stack));
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stack++;
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}
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printk("%sCall Trace:\n", loglvl);
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dump_trace(current, &stackops, (void *)loglvl);
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}
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