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e1c91672c5
commit c200e4bb44 upstream.
User mode linux is the last user of the PT_DTRACE flag. Using the flag to indicate
single stepping is a little confusing and worse changing tsk->ptrace without locking
could potentionally cause problems.
So use a thread info flag with a better name instead of flag in tsk->ptrace.
Remove the definition PT_DTRACE as uml is the last user.
Cc: stable@vger.kernel.org
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Tested-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Link: https://lkml.kernel.org/r/20220505182645.497868-3-ebiederm@xmission.com
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
51 lines
1.1 KiB
C
51 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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*/
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#include <linux/stddef.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/ptrace.h>
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#include <linux/sched/mm.h>
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#include <linux/sched/task.h>
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#include <linux/sched/task_stack.h>
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#include <linux/slab.h>
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#include <asm/current.h>
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#include <asm/processor.h>
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#include <linux/uaccess.h>
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#include <as-layout.h>
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#include <mem_user.h>
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#include <skas.h>
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#include <os.h>
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void flush_thread(void)
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{
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void *data = NULL;
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int ret;
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arch_flush_thread(¤t->thread.arch);
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ret = unmap(¤t->mm->context.id, 0, TASK_SIZE, 1, &data);
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if (ret) {
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printk(KERN_ERR "flush_thread - clearing address space failed, "
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"err = %d\n", ret);
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force_sig(SIGKILL);
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}
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get_safe_registers(current_pt_regs()->regs.gp,
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current_pt_regs()->regs.fp);
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__switch_mm(¤t->mm->context.id);
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}
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void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
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{
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PT_REGS_IP(regs) = eip;
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PT_REGS_SP(regs) = esp;
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clear_thread_flag(TIF_SINGLESTEP);
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#ifdef SUBARCH_EXECVE1
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SUBARCH_EXECVE1(regs->regs);
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#endif
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}
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EXPORT_SYMBOL(start_thread);
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