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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

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