From 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 22 Oct 2024 10:36:11 +0000
Subject: [PATCH] 修改4g拨号为QMI,需要在系统里后台执行quectel-CM

---
 kernel/arch/um/kernel/ptrace.c |   21 ++++++++++-----------
 1 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/kernel/arch/um/kernel/ptrace.c b/kernel/arch/um/kernel/ptrace.c
index 1a1d88a..d37802c 100644
--- a/kernel/arch/um/kernel/ptrace.c
+++ b/kernel/arch/um/kernel/ptrace.c
@@ -1,6 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
- * Licensed under the GPL
  */
 
 #include <linux/audit.h>
@@ -12,7 +12,7 @@
 
 void user_enable_single_step(struct task_struct *child)
 {
-	child->ptrace |= PT_DTRACE;
+	set_tsk_thread_flag(child, TIF_SINGLESTEP);
 	child->thread.singlestep_syscall = 0;
 
 #ifdef SUBARCH_SET_SINGLESTEPPING
@@ -22,7 +22,7 @@
 
 void user_disable_single_step(struct task_struct *child)
 {
-	child->ptrace &= ~PT_DTRACE;
+	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
 	child->thread.singlestep_syscall = 0;
 
 #ifdef SUBARCH_SET_SINGLESTEPPING
@@ -66,7 +66,7 @@
 
 #ifdef PTRACE_GETREGS
 	case PTRACE_GETREGS: { /* Get all gp regs from the child. */
-		if (!access_ok(VERIFY_WRITE, p, MAX_REG_OFFSET)) {
+		if (!access_ok(p, MAX_REG_OFFSET)) {
 			ret = -EIO;
 			break;
 		}
@@ -81,7 +81,7 @@
 #ifdef PTRACE_SETREGS
 	case PTRACE_SETREGS: { /* Set all gp regs in the child. */
 		unsigned long tmp = 0;
-		if (!access_ok(VERIFY_READ, p, MAX_REG_OFFSET)) {
+		if (!access_ok(p, MAX_REG_OFFSET)) {
 			ret = -EIO;
 			break;
 		}
@@ -112,17 +112,16 @@
 	return ret;
 }
 
-static void send_sigtrap(struct task_struct *tsk, struct uml_pt_regs *regs,
-		  int error_code)
+static void send_sigtrap(struct uml_pt_regs *regs, int error_code)
 {
 	/* Send us the fake SIGTRAP */
 	force_sig_fault(SIGTRAP, TRAP_BRKPT,
 			/* User-mode eip? */
-			UPT_IS_USER(regs) ? (void __user *) UPT_IP(regs) : NULL, tsk);
+			UPT_IS_USER(regs) ? (void __user *) UPT_IP(regs) : NULL);
 }
 
 /*
- * XXX Check PT_DTRACE vs TIF_SINGLESTEP for singlestepping check and
+ * XXX Check TIF_SINGLESTEP for singlestepping check and
  * PT_PTRACED vs TIF_SYSCALL_TRACE for syscall tracing check
  */
 int syscall_trace_enter(struct pt_regs *regs)
@@ -146,8 +145,8 @@
 	audit_syscall_exit(regs);
 
 	/* Fake a debug trap */
-	if (ptraced & PT_DTRACE)
-		send_sigtrap(current, &regs->regs, 0);
+	if (test_thread_flag(TIF_SINGLESTEP))
+		send_sigtrap(&regs->regs, 0);
 
 	if (!test_thread_flag(TIF_SYSCALL_TRACE))
 		return;

--
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