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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/arch/s390/kernel/process.c
..
..
@@ -37,8 +37,10 @@
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 #include <asm/irq.h>
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 #include <asm/nmi.h>
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 #include <asm/smp.h>
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+#include <asm/stacktrace.h>
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 #include <asm/switch_to.h>
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 #include <asm/runtime_instr.h>
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+#include <asm/unwind.h>
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 #include "entry.h"
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45
 
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 asmlinkage void ret_from_fork(void) asm ("ret_from_fork");
..
..
@@ -75,11 +77,23 @@
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77
 
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 	memcpy(dst, src, arch_task_struct_size);
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 	dst->thread.fpu.regs = dst->thread.fpu.fprs;
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+
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+	/*
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+	 * Don't transfer over the runtime instrumentation or the guarded
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+	 * storage control block pointers. These fields are cleared here instead
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+	 * of in copy_thread() to avoid premature freeing of associated memory
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+	 * on fork() failure. Wait to clear the RI flag because ->stack still
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+	 * refers to the source thread.
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+	 */
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+	dst->thread.ri_cb = NULL;
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+	dst->thread.gs_cb = NULL;
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+	dst->thread.gs_bc_cb = NULL;
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+
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 	return 0;
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 }
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94
 
81
-int copy_thread_tls(unsigned long clone_flags, unsigned long new_stackp,
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-		    unsigned long arg, struct task_struct *p, unsigned long tls)
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+int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
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+		unsigned long arg, struct task_struct *p, unsigned long tls)
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 {
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 	struct fake_frame
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 	{
..
..
@@ -104,6 +118,7 @@
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 	p->thread.system_timer = 0;
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 	p->thread.hardirq_timer = 0;
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 	p->thread.softirq_timer = 0;
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+	p->thread.last_break = 1;
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122
 
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 	frame->sf.back_chain = 0;
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 	/* new return point is ret_from_fork */
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..
@@ -112,7 +127,7 @@
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 	frame->sf.gprs[9] = (unsigned long) frame;
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128
 
114
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 	/* Store access registers to kernel stack of new process. */
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-	if (unlikely(p->flags & PF_KTHREAD)) {
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+	if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) {
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 		/* kernel thread */
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132
 		memset(&frame->childregs, 0, sizeof(struct pt_regs));
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133
 		frame->childregs.psw.mask = PSW_KERNEL_BITS | PSW_MASK_DAT |
..
..
@@ -131,13 +146,11 @@
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 	frame->childregs.flags = 0;
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147
 	if (new_stackp)
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148
 		frame->childregs.gprs[15] = new_stackp;
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-
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-	/* Don't copy runtime instrumentation info */
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-	p->thread.ri_cb = NULL;
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+	/*
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+	 * Clear the runtime instrumentation flag after the above childregs
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+	 * copy. The CB pointer was already cleared in arch_dup_task_struct().
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+	 */
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 	frame->childregs.psw.mask &= ~PSW_MASK_RI;
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-	/* Don't copy guarded storage control block */
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-	p->thread.gs_cb = NULL;
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-	p->thread.gs_bc_cb = NULL;
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154
 
142
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 	/* Set a new TLS ?  */
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156
 	if (clone_flags & CLONE_SETTLS) {
..
..
@@ -157,29 +170,10 @@
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 	asm volatile("sfpc %0" : : "d" (0));
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171
 }
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172
 
160
-/*
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- * fill in the FPU structure for a core dump.
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- */
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-int dump_fpu (struct pt_regs * regs, s390_fp_regs *fpregs)
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-{
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-	save_fpu_regs();
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-	fpregs->fpc = current->thread.fpu.fpc;
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-	fpregs->pad = 0;
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-	if (MACHINE_HAS_VX)
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-		convert_vx_to_fp((freg_t *)&fpregs->fprs,
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-				 current->thread.fpu.vxrs);
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-	else
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-		memcpy(&fpregs->fprs, current->thread.fpu.fprs,
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-		       sizeof(fpregs->fprs));
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-	return 1;
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-}
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-EXPORT_SYMBOL(dump_fpu);
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-
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 unsigned long get_wchan(struct task_struct *p)
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174
 {
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-	struct stack_frame *sf, *low, *high;
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-	unsigned long return_address;
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-	int count;
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+	struct unwind_state state;
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+	unsigned long ip = 0;
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177
 
184
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 	if (!p || p == current || p->state == TASK_RUNNING || !task_stack_page(p))
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 		return 0;
..
..
@@ -187,26 +181,22 @@
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 	if (!try_get_task_stack(p))
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182
 		return 0;
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183
 
190
-	low = task_stack_page(p);
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-	high = (struct stack_frame *) task_pt_regs(p);
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-	sf = (struct stack_frame *) p->thread.ksp;
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-	if (sf <= low || sf > high) {
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-		return_address = 0;
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-		goto out;
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-	}
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-	for (count = 0; count < 16; count++) {
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-		sf = (struct stack_frame *) sf->back_chain;
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-		if (sf <= low || sf > high) {
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-			return_address = 0;
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-			goto out;
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+	unwind_for_each_frame(&state, p, NULL, 0) {
185
+		if (state.stack_info.type != STACK_TYPE_TASK) {
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+			ip = 0;
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+			break;
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188
 		}
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-		return_address = sf->gprs[8];
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-		if (!in_sched_functions(return_address))
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-			goto out;
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+
190
+		ip = unwind_get_return_address(&state);
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+		if (!ip)
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+			break;
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+
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+		if (!in_sched_functions(ip))
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+			break;
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196
 	}
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-out:
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+
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 	put_task_stack(p);
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-	return return_address;
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+	return ip;
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 }
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201
 
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 unsigned long arch_align_stack(unsigned long sp)