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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/drivers/tty/sysrq.c
....@@ -19,6 +19,7 @@
1919 #include <linux/sched/rt.h>
2020 #include <linux/sched/debug.h>
2121 #include <linux/sched/task.h>
22
+#include <linux/ctype.h>
2223 #include <linux/interrupt.h>
2324 #include <linux/mm.h>
2425 #include <linux/fs.h>
....@@ -63,6 +64,19 @@
6364 	return sysrq_enabled || sysrq_always_enabled;
6465 }
6566 
67
+/**
68
+ * sysrq_mask - Getter for sysrq_enabled mask.
69
+ *
70
+ * Return: 1 if sysrq is always enabled, enabled sysrq_key_op mask otherwise.
71
+ */
72
+int sysrq_mask(void)
73
+{
74
+	if (sysrq_always_enabled)
75
+		return 1;
76
+	return sysrq_enabled;
77
+}
78
+EXPORT_SYMBOL_GPL(sysrq_mask);
79
+
6680 /*
6781  * A value of 1 means 'all', other nonzero values are an op mask:
6882  */
....@@ -93,7 +107,7 @@
93107 	pr_info("Loglevel set to %d\n", i);
94108 	console_loglevel = i;
95109 }
96
-static struct sysrq_key_op sysrq_loglevel_op = {
110
+static const struct sysrq_key_op sysrq_loglevel_op = {
97111 	.handler	= sysrq_handle_loglevel,
98112 	.help_msg	= "loglevel(0-9)",
99113 	.action_msg	= "Changing Loglevel",
....@@ -106,14 +120,14 @@
106120 	struct work_struct *SAK_work = &vc_cons[fg_console].SAK_work;
107121 	schedule_work(SAK_work);
108122 }
109
-static struct sysrq_key_op sysrq_SAK_op = {
123
+static const struct sysrq_key_op sysrq_SAK_op = {
110124 	.handler	= sysrq_handle_SAK,
111125 	.help_msg	= "sak(k)",
112126 	.action_msg	= "SAK",
113127 	.enable_mask	= SYSRQ_ENABLE_KEYBOARD,
114128 };
115129 #else
116
-#define sysrq_SAK_op (*(struct sysrq_key_op *)NULL)
130
+#define sysrq_SAK_op (*(const struct sysrq_key_op *)NULL)
117131 #endif
118132 
119133 #ifdef CONFIG_VT
....@@ -122,14 +136,14 @@
122136 	vt_reset_unicode(fg_console);
123137 }
124138 
125
-static struct sysrq_key_op sysrq_unraw_op = {
139
+static const struct sysrq_key_op sysrq_unraw_op = {
126140 	.handler	= sysrq_handle_unraw,
127141 	.help_msg	= "unraw(r)",
128142 	.action_msg	= "Keyboard mode set to system default",
129143 	.enable_mask	= SYSRQ_ENABLE_KEYBOARD,
130144 };
131145 #else
132
-#define sysrq_unraw_op (*(struct sysrq_key_op *)NULL)
146
+#define sysrq_unraw_op (*(const struct sysrq_key_op *)NULL)
133147 #endif /* CONFIG_VT */
134148 
135149 static void sysrq_handle_crash(int key)
....@@ -139,7 +153,7 @@
139153 
140154 	panic("sysrq triggered crash\n");
141155 }
142
-static struct sysrq_key_op sysrq_crash_op = {
156
+static const struct sysrq_key_op sysrq_crash_op = {
143157 	.handler	= sysrq_handle_crash,
144158 	.help_msg	= "crash(c)",
145159 	.action_msg	= "Trigger a crash",
....@@ -152,18 +166,20 @@
152166 	local_irq_enable();
153167 	emergency_restart();
154168 }
155
-static struct sysrq_key_op sysrq_reboot_op = {
169
+static const struct sysrq_key_op sysrq_reboot_op = {
156170 	.handler	= sysrq_handle_reboot,
157171 	.help_msg	= "reboot(b)",
158172 	.action_msg	= "Resetting",
159173 	.enable_mask	= SYSRQ_ENABLE_BOOT,
160174 };
161175 
176
+const struct sysrq_key_op *__sysrq_reboot_op = &sysrq_reboot_op;
177
+
162178 static void sysrq_handle_sync(int key)
163179 {
164180 	emergency_sync();
165181 }
166
-static struct sysrq_key_op sysrq_sync_op = {
182
+static const struct sysrq_key_op sysrq_sync_op = {
167183 	.handler	= sysrq_handle_sync,
168184 	.help_msg	= "sync(s)",
169185 	.action_msg	= "Emergency Sync",
....@@ -175,7 +191,7 @@
175191 	sysrq_timer_list_show();
176192 }
177193 
178
-static struct sysrq_key_op sysrq_show_timers_op = {
194
+static const struct sysrq_key_op sysrq_show_timers_op = {
179195 	.handler	= sysrq_handle_show_timers,
180196 	.help_msg	= "show-all-timers(q)",
181197 	.action_msg	= "Show clockevent devices & pending hrtimers (no others)",
....@@ -185,7 +201,7 @@
185201 {
186202 	emergency_remount();
187203 }
188
-static struct sysrq_key_op sysrq_mountro_op = {
204
+static const struct sysrq_key_op sysrq_mountro_op = {
189205 	.handler	= sysrq_handle_mountro,
190206 	.help_msg	= "unmount(u)",
191207 	.action_msg	= "Emergency Remount R/O",
....@@ -198,13 +214,13 @@
198214 	debug_show_all_locks();
199215 }
200216 
201
-static struct sysrq_key_op sysrq_showlocks_op = {
217
+static const struct sysrq_key_op sysrq_showlocks_op = {
202218 	.handler	= sysrq_handle_showlocks,
203219 	.help_msg	= "show-all-locks(d)",
204220 	.action_msg	= "Show Locks Held",
205221 };
206222 #else
207
-#define sysrq_showlocks_op (*(struct sysrq_key_op *)NULL)
223
+#define sysrq_showlocks_op (*(const struct sysrq_key_op *)NULL)
208224 #endif
209225 
210226 #ifdef CONFIG_SMP
....@@ -215,12 +231,14 @@
215231 	unsigned long flags;
216232 
217233 	/* Idle CPUs have no interesting backtrace. */
218
-	if (idle_cpu(smp_processor_id()))
234
+	if (idle_cpu(smp_processor_id())) {
235
+		pr_info("CPU%d: backtrace skipped as idling\n", smp_processor_id());
219236 		return;
237
+	}
220238 
221239 	raw_spin_lock_irqsave(&show_lock, flags);
222240 	pr_info("CPU%d:\n", smp_processor_id());
223
-	show_stack(NULL, NULL);
241
+	show_stack(NULL, NULL, KERN_INFO);
224242 	raw_spin_unlock_irqrestore(&show_lock, flags);
225243 }
226244 
....@@ -243,15 +261,18 @@
243261 
244262 		if (in_irq())
245263 			regs = get_irq_regs();
246
-		if (regs) {
247
-			pr_info("CPU%d:\n", smp_processor_id());
264
+
265
+		pr_info("CPU%d:\n", smp_processor_id());
266
+		if (regs)
248267 			show_regs(regs);
249
-		}
268
+		else
269
+			show_stack(NULL, NULL, KERN_INFO);
270
+
250271 		schedule_work(&sysrq_showallcpus);
251272 	}
252273 }
253274 
254
-static struct sysrq_key_op sysrq_showallcpus_op = {
275
+static const struct sysrq_key_op sysrq_showallcpus_op = {
255276 	.handler	= sysrq_handle_showallcpus,
256277 	.help_msg	= "show-backtrace-all-active-cpus(l)",
257278 	.action_msg	= "Show backtrace of all active CPUs",
....@@ -269,7 +290,7 @@
269290 		show_regs(regs);
270291 	perf_event_print_debug();
271292 }
272
-static struct sysrq_key_op sysrq_showregs_op = {
293
+static const struct sysrq_key_op sysrq_showregs_op = {
273294 	.handler	= sysrq_handle_showregs,
274295 	.help_msg	= "show-registers(p)",
275296 	.action_msg	= "Show Regs",
....@@ -281,7 +302,7 @@
281302 	show_state();
282303 	show_workqueue_state();
283304 }
284
-static struct sysrq_key_op sysrq_showstate_op = {
305
+static const struct sysrq_key_op sysrq_showstate_op = {
285306 	.handler	= sysrq_handle_showstate,
286307 	.help_msg	= "show-task-states(t)",
287308 	.action_msg	= "Show State",
....@@ -292,7 +313,7 @@
292313 {
293314 	show_state_filter(TASK_UNINTERRUPTIBLE);
294315 }
295
-static struct sysrq_key_op sysrq_showstate_blocked_op = {
316
+static const struct sysrq_key_op sysrq_showstate_blocked_op = {
296317 	.handler	= sysrq_handle_showstate_blocked,
297318 	.help_msg	= "show-blocked-tasks(w)",
298319 	.action_msg	= "Show Blocked State",
....@@ -306,21 +327,21 @@
306327 {
307328 	ftrace_dump(DUMP_ALL);
308329 }
309
-static struct sysrq_key_op sysrq_ftrace_dump_op = {
330
+static const struct sysrq_key_op sysrq_ftrace_dump_op = {
310331 	.handler	= sysrq_ftrace_dump,
311332 	.help_msg	= "dump-ftrace-buffer(z)",
312333 	.action_msg	= "Dump ftrace buffer",
313334 	.enable_mask	= SYSRQ_ENABLE_DUMP,
314335 };
315336 #else
316
-#define sysrq_ftrace_dump_op (*(struct sysrq_key_op *)NULL)
337
+#define sysrq_ftrace_dump_op (*(const struct sysrq_key_op *)NULL)
317338 #endif
318339 
319340 static void sysrq_handle_showmem(int key)
320341 {
321342 	show_mem(0, NULL);
322343 }
323
-static struct sysrq_key_op sysrq_showmem_op = {
344
+static const struct sysrq_key_op sysrq_showmem_op = {
324345 	.handler	= sysrq_handle_showmem,
325346 	.help_msg	= "show-memory-usage(m)",
326347 	.action_msg	= "Show Memory",
....@@ -341,7 +362,7 @@
341362 		if (is_global_init(p))
342363 			continue;
343364 
344
-		do_send_sig_info(sig, SEND_SIG_FORCED, p, PIDTYPE_MAX);
365
+		do_send_sig_info(sig, SEND_SIG_PRIV, p, PIDTYPE_MAX);
345366 	}
346367 	read_unlock(&tasklist_lock);
347368 }
....@@ -351,7 +372,7 @@
351372 	send_sig_all(SIGTERM);
352373 	console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
353374 }
354
-static struct sysrq_key_op sysrq_term_op = {
375
+static const struct sysrq_key_op sysrq_term_op = {
355376 	.handler	= sysrq_handle_term,
356377 	.help_msg	= "terminate-all-tasks(e)",
357378 	.action_msg	= "Terminate All Tasks",
....@@ -381,32 +402,30 @@
381402 {
382403 	schedule_work(&moom_work);
383404 }
384
-static struct sysrq_key_op sysrq_moom_op = {
405
+static const struct sysrq_key_op sysrq_moom_op = {
385406 	.handler	= sysrq_handle_moom,
386407 	.help_msg	= "memory-full-oom-kill(f)",
387408 	.action_msg	= "Manual OOM execution",
388409 	.enable_mask	= SYSRQ_ENABLE_SIGNAL,
389410 };
390411 
391
-#ifdef CONFIG_BLOCK
392412 static void sysrq_handle_thaw(int key)
393413 {
394414 	emergency_thaw_all();
395415 }
396
-static struct sysrq_key_op sysrq_thaw_op = {
416
+static const struct sysrq_key_op sysrq_thaw_op = {
397417 	.handler	= sysrq_handle_thaw,
398418 	.help_msg	= "thaw-filesystems(j)",
399419 	.action_msg	= "Emergency Thaw of all frozen filesystems",
400420 	.enable_mask	= SYSRQ_ENABLE_SIGNAL,
401421 };
402
-#endif
403422 
404423 static void sysrq_handle_kill(int key)
405424 {
406425 	send_sig_all(SIGKILL);
407426 	console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
408427 }
409
-static struct sysrq_key_op sysrq_kill_op = {
428
+static const struct sysrq_key_op sysrq_kill_op = {
410429 	.handler	= sysrq_handle_kill,
411430 	.help_msg	= "kill-all-tasks(i)",
412431 	.action_msg	= "Kill All Tasks",
....@@ -417,7 +436,7 @@
417436 {
418437 	normalize_rt_tasks();
419438 }
420
-static struct sysrq_key_op sysrq_unrt_op = {
439
+static const struct sysrq_key_op sysrq_unrt_op = {
421440 	.handler	= sysrq_handle_unrt,
422441 	.help_msg	= "nice-all-RT-tasks(n)",
423442 	.action_msg	= "Nice All RT Tasks",
....@@ -427,7 +446,7 @@
427446 /* Key Operations table and lock */
428447 static DEFINE_SPINLOCK(sysrq_key_table_lock);
429448 
430
-static struct sysrq_key_op *sysrq_key_table[36] = {
449
+static const struct sysrq_key_op *sysrq_key_table[62] = {
431450 	&sysrq_loglevel_op,		/* 0 */
432451 	&sysrq_loglevel_op,		/* 1 */
433452 	&sysrq_loglevel_op,		/* 2 */
....@@ -484,6 +503,32 @@
484503 	/* y: May be registered on sparc64 for global register dump */
485504 	NULL,				/* y */
486505 	&sysrq_ftrace_dump_op,		/* z */
506
+	NULL,				/* A */
507
+	NULL,				/* B */
508
+	NULL,				/* C */
509
+	NULL,				/* D */
510
+	NULL,				/* E */
511
+	NULL,				/* F */
512
+	NULL,				/* G */
513
+	NULL,				/* H */
514
+	NULL,				/* I */
515
+	NULL,				/* J */
516
+	NULL,				/* K */
517
+	NULL,				/* L */
518
+	NULL,				/* M */
519
+	NULL,				/* N */
520
+	NULL,				/* O */
521
+	NULL,				/* P */
522
+	NULL,				/* Q */
523
+	NULL,				/* R */
524
+	NULL,				/* S */
525
+	NULL,				/* T */
526
+	NULL,				/* U */
527
+	NULL,				/* V */
528
+	NULL,				/* W */
529
+	NULL,				/* X */
530
+	NULL,				/* Y */
531
+	NULL,				/* Z */
487532 };
488533 
489534 /* key2index calculation, -1 on invalid index */
....@@ -495,6 +540,8 @@
495540 		retval = key - '0';
496541 	else if ((key >= 'a') && (key <= 'z'))
497542 		retval = key + 10 - 'a';
543
+	else if ((key >= 'A') && (key <= 'Z'))
544
+		retval = key + 36 - 'A';
498545 	else
499546 		retval = -1;
500547 	return retval;
....@@ -503,9 +550,9 @@
503550 /*
504551  * get and put functions for the table, exposed to modules.
505552  */
506
-struct sysrq_key_op *__sysrq_get_key_op(int key)
553
+static const struct sysrq_key_op *__sysrq_get_key_op(int key)
507554 {
508
-        struct sysrq_key_op *op_p = NULL;
555
+        const struct sysrq_key_op *op_p = NULL;
509556         int i;
510557 
511558 	i = sysrq_key_table_key2index(key);
....@@ -515,7 +562,7 @@
515562         return op_p;
516563 }
517564 
518
-static void __sysrq_put_key_op(int key, struct sysrq_key_op *op_p)
565
+static void __sysrq_put_key_op(int key, const struct sysrq_key_op *op_p)
519566 {
520567         int i = sysrq_key_table_key2index(key);
521568 
....@@ -525,9 +572,13 @@
525572 
526573 void __handle_sysrq(int key, bool check_mask)
527574 {
528
-	struct sysrq_key_op *op_p;
575
+	const struct sysrq_key_op *op_p;
529576 	int orig_log_level;
577
+	int orig_suppress_printk;
530578 	int i;
579
+
580
+	orig_suppress_printk = suppress_printk;
581
+	suppress_printk = 0;
531582 
532583 	rcu_sysrq_start();
533584 	rcu_read_lock();
....@@ -574,6 +625,8 @@
574625 	}
575626 	rcu_read_unlock();
576627 	rcu_sysrq_end();
628
+
629
+	suppress_printk = orig_suppress_printk;
577630 }
578631 
579632 void handle_sysrq(int key)
....@@ -602,6 +655,8 @@
602655 	unsigned long key_down[BITS_TO_LONGS(KEY_CNT)];
603656 	unsigned int alt;
604657 	unsigned int alt_use;
658
+	unsigned int shift;
659
+	unsigned int shift_use;
605660 	bool active;
606661 	bool need_reinject;
607662 	bool reinjecting;
....@@ -653,8 +708,7 @@
653708 
654709 	state->reset_requested = true;
655710 
656
-	ksys_sync();
657
-	kernel_restart(NULL);
711
+	orderly_reboot();
658712 }
659713 
660714 static void sysrq_handle_reset_request(struct sysrq_state *state)
....@@ -729,6 +783,8 @@
729783 
730784 	/* Get reset timeout if any. */
731785 	of_property_read_u32(np, "timeout-ms", &sysrq_reset_downtime_ms);
786
+
787
+	of_node_put(np);
732788 }
733789 #else
734790 static void sysrq_of_get_keyreset_config(void)
....@@ -785,10 +841,20 @@
785841 		}
786842 		break;
787843 
844
+	case KEY_LEFTSHIFT:
845
+	case KEY_RIGHTSHIFT:
846
+		if (!value)
847
+			sysrq->shift = KEY_RESERVED;
848
+		else if (value != 2)
849
+			sysrq->shift = code;
850
+		break;
851
+
788852 	case KEY_SYSRQ:
789853 		if (value == 1 && sysrq->alt != KEY_RESERVED) {
790854 			sysrq->active = true;
791855 			sysrq->alt_use = sysrq->alt;
856
+			/* either RESERVED (for released) or actual code */
857
+			sysrq->shift_use = sysrq->shift;
792858 			/*
793859 			 * If nothing else will be pressed we'll need
794860 			 * to re-inject Alt-SysRq keysroke.
....@@ -811,8 +877,12 @@
811877 
812878 	default:
813879 		if (sysrq->active && value && value != 2) {
880
+			unsigned char c = sysrq_xlate[code];
881
+
814882 			sysrq->need_reinject = false;
815
-			__handle_sysrq(sysrq_xlate[code], true);
883
+			if (sysrq->shift_use != KEY_RESERVED)
884
+				c = toupper(c);
885
+			__handle_sysrq(c, true);
816886 		}
817887 		break;
818888 	}
....@@ -960,8 +1030,6 @@
9601030 	.id_table	= sysrq_ids,
9611031 };
9621032 
963
-static bool sysrq_handler_registered;
964
-
9651033 static inline void sysrq_register_handler(void)
9661034 {
9671035 	int error;
....@@ -971,16 +1039,11 @@
9711039 	error = input_register_handler(&sysrq_handler);
9721040 	if (error)
9731041 		pr_err("Failed to register input handler, error %d", error);
974
-	else
975
-		sysrq_handler_registered = true;
9761042 }
9771043 
9781044 static inline void sysrq_unregister_handler(void)
9791045 {
980
-	if (sysrq_handler_registered) {
981
-		input_unregister_handler(&sysrq_handler);
982
-		sysrq_handler_registered = false;
983
-	}
1046
+	input_unregister_handler(&sysrq_handler);
9841047 }
9851048 
9861049 static int sysrq_reset_seq_param_set(const char *buffer,
....@@ -1046,9 +1109,10 @@
10461109 
10471110 	return 0;
10481111 }
1112
+EXPORT_SYMBOL_GPL(sysrq_toggle_support);
10491113 
1050
-static int __sysrq_swap_key_ops(int key, struct sysrq_key_op *insert_op_p,
1051
-                                struct sysrq_key_op *remove_op_p)
1114
+static int __sysrq_swap_key_ops(int key, const struct sysrq_key_op *insert_op_p,
1115
+                                const struct sysrq_key_op *remove_op_p)
10521116 {
10531117 	int retval;
10541118 
....@@ -1071,13 +1135,13 @@
10711135 	return retval;
10721136 }
10731137 
1074
-int register_sysrq_key(int key, struct sysrq_key_op *op_p)
1138
+int register_sysrq_key(int key, const struct sysrq_key_op *op_p)
10751139 {
10761140 	return __sysrq_swap_key_ops(key, op_p, NULL);
10771141 }
10781142 EXPORT_SYMBOL(register_sysrq_key);
10791143 
1080
-int unregister_sysrq_key(int key, struct sysrq_key_op *op_p)
1144
+int unregister_sysrq_key(int key, const struct sysrq_key_op *op_p)
10811145 {
10821146 	return __sysrq_swap_key_ops(key, NULL, op_p);
10831147 }
....@@ -1101,15 +1165,15 @@
11011165 	return count;
11021166 }
11031167 
1104
-static const struct file_operations proc_sysrq_trigger_operations = {
1105
-	.write		= write_sysrq_trigger,
1106
-	.llseek		= noop_llseek,
1168
+static const struct proc_ops sysrq_trigger_proc_ops = {
1169
+	.proc_write	= write_sysrq_trigger,
1170
+	.proc_lseek	= noop_llseek,
11071171 };
11081172 
11091173 static void sysrq_init_procfs(void)
11101174 {
11111175 	if (!proc_create("sysrq-trigger", S_IWUSR, NULL,
1112
-			 &proc_sysrq_trigger_operations))
1176
+			 &sysrq_trigger_proc_ops))
11131177 		pr_err("Failed to register proc interface\n");
11141178 }
11151179