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2024-05-13 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e 
 kernel/drivers/base/firmware_loader/fallback.c
....@@ -9,6 +9,7 @@
99 #include <linux/umh.h>
1010 #include <linux/sysctl.h>
1111 #include <linux/vmalloc.h>
12
+#include <linux/module.h>
1213 
1314 #include "fallback.h"
1415 #include "firmware.h"
....@@ -16,6 +17,8 @@
1617 /*
1718  * firmware fallback mechanism
1819  */
20
+
21
+MODULE_IMPORT_NS(FIRMWARE_LOADER_PRIVATE);
1922 
2023 extern struct firmware_fallback_config fw_fallback_config;
2124 
....@@ -103,7 +106,7 @@
103106 
104107 static LIST_HEAD(pending_fw_head);
105108 
106
-void kill_pending_fw_fallback_reqs(bool only_kill_custom)
109
+void kill_pending_fw_fallback_reqs(bool kill_all)
107110 {
108111 	struct fw_priv *fw_priv;
109112 	struct fw_priv *next;
....@@ -111,16 +114,20 @@
111114 	mutex_lock(&fw_lock);
112115 	list_for_each_entry_safe(fw_priv, next, &pending_fw_head,
113116 				 pending_list) {
114
-		if (!fw_priv->need_uevent || !only_kill_custom)
117
+		if (kill_all || !fw_priv->need_uevent)
115118 			 __fw_load_abort(fw_priv);
116119 	}
120
+
121
+	if (kill_all)
122
+		fw_load_abort_all = true;
123
+
117124 	mutex_unlock(&fw_lock);
118125 }
119126 
120127 static ssize_t timeout_show(struct class *class, struct class_attribute *attr,
121128 			    char *buf)
122129 {
123
-	return sprintf(buf, "%d\n", __firmware_loading_timeout());
130
+	return sysfs_emit(buf, "%d\n", __firmware_loading_timeout());
124131 }
125132 
126133 /**
....@@ -215,21 +222,7 @@
215222 		loading = fw_sysfs_loading(fw_sysfs->fw_priv);
216223 	mutex_unlock(&fw_lock);
217224 
218
-	return sprintf(buf, "%d\n", loading);
219
-}
220
-
221
-/* one pages buffer should be mapped/unmapped only once */
222
-static int map_fw_priv_pages(struct fw_priv *fw_priv)
223
-{
224
-	if (!fw_priv->is_paged_buf)
225
-		return 0;
226
-
227
-	vunmap(fw_priv->data);
228
-	fw_priv->data = vmap(fw_priv->pages, fw_priv->nr_pages, 0,
229
-			     PAGE_KERNEL_RO);
230
-	if (!fw_priv->data)
231
-		return -ENOMEM;
232
-	return 0;
225
+	return sysfs_emit(buf, "%d\n", loading);
233226 }
234227 
235228 /**
....@@ -253,7 +246,6 @@
253246 	struct fw_priv *fw_priv;
254247 	ssize_t written = count;
255248 	int loading = simple_strtol(buf, NULL, 10);
256
-	int i;
257249 
258250 	mutex_lock(&fw_lock);
259251 	fw_priv = fw_sysfs->fw_priv;
....@@ -264,12 +256,7 @@
264256 	case 1:
265257 		/* discarding any previous partial load */
266258 		if (!fw_sysfs_done(fw_priv)) {
267
-			for (i = 0; i < fw_priv->nr_pages; i++)
268
-				__free_page(fw_priv->pages[i]);
269
-			vfree(fw_priv->pages);
270
-			fw_priv->pages = NULL;
271
-			fw_priv->page_array_size = 0;
272
-			fw_priv->nr_pages = 0;
259
+			fw_free_paged_buf(fw_priv);
273260 			fw_state_start(fw_priv);
274261 		}
275262 		break;
....@@ -283,14 +270,14 @@
283270 			 * see the mapped 'buf->data' once the loading
284271 			 * is completed.
285272 			 * */
286
-			rc = map_fw_priv_pages(fw_priv);
273
+			rc = fw_map_paged_buf(fw_priv);
287274 			if (rc)
288275 				dev_err(dev, "%s: map pages failed\n",
289276 					__func__);
290277 			else
291
-				rc = security_kernel_post_read_file(NULL,
292
-						fw_priv->data, fw_priv->size,
293
-						READING_FIRMWARE);
278
+				rc = security_kernel_post_load_data(fw_priv->data,
279
+						fw_priv->size,
280
+						LOADING_FIRMWARE, "blob");
294281 
295282 			/*
296283 			 * Same logic as fw_load_abort, only the DONE bit
....@@ -304,10 +291,10 @@
304291 			}
305292 			break;
306293 		}
307
-		/* fallthrough */
294
+		fallthrough;
308295 	default:
309296 		dev_err(dev, "%s: unexpected value (%d)\n", __func__, loading);
310
-		/* fallthrough */
297
+		fallthrough;
311298 	case -1:
312299 		fw_load_abort(fw_sysfs);
313300 		break;
....@@ -387,40 +374,13 @@
387374 
388375 static int fw_realloc_pages(struct fw_sysfs *fw_sysfs, int min_size)
389376 {
390
-	struct fw_priv *fw_priv= fw_sysfs->fw_priv;
391
-	int pages_needed = PAGE_ALIGN(min_size) >> PAGE_SHIFT;
377
+	int err;
392378 
393
-	/* If the array of pages is too small, grow it... */
394
-	if (fw_priv->page_array_size < pages_needed) {
395
-		int new_array_size = max(pages_needed,
396
-					 fw_priv->page_array_size * 2);
397
-		struct page **new_pages;
398
-
399
-		new_pages = vmalloc(array_size(new_array_size, sizeof(void *)));
400
-		if (!new_pages) {
401
-			fw_load_abort(fw_sysfs);
402
-			return -ENOMEM;
403
-		}
404
-		memcpy(new_pages, fw_priv->pages,
405
-		       fw_priv->page_array_size * sizeof(void *));
406
-		memset(&new_pages[fw_priv->page_array_size], 0, sizeof(void *) *
407
-		       (new_array_size - fw_priv->page_array_size));
408
-		vfree(fw_priv->pages);
409
-		fw_priv->pages = new_pages;
410
-		fw_priv->page_array_size = new_array_size;
411
-	}
412
-
413
-	while (fw_priv->nr_pages < pages_needed) {
414
-		fw_priv->pages[fw_priv->nr_pages] =
415
-			alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
416
-
417
-		if (!fw_priv->pages[fw_priv->nr_pages]) {
418
-			fw_load_abort(fw_sysfs);
419
-			return -ENOMEM;
420
-		}
421
-		fw_priv->nr_pages++;
422
-	}
423
-	return 0;
379
+	err = fw_grow_paged_buf(fw_sysfs->fw_priv,
380
+				PAGE_ALIGN(min_size) >> PAGE_SHIFT);
381
+	if (err)
382
+		fw_load_abort(fw_sysfs);
383
+	return err;
424384 }
425385 
426386 /**
....@@ -505,7 +465,7 @@
505465 
506466 static struct fw_sysfs *
507467 fw_create_instance(struct firmware *firmware, const char *fw_name,
508
-		   struct device *device, enum fw_opt opt_flags)
468
+		   struct device *device, u32 opt_flags)
509469 {
510470 	struct fw_sysfs *fw_sysfs;
511471 	struct device *f_dev;
....@@ -532,13 +492,11 @@
532492 /**
533493  * fw_load_sysfs_fallback() - load a firmware via the sysfs fallback mechanism
534494  * @fw_sysfs: firmware sysfs information for the firmware to load
535
- * @opt_flags: flags of options, FW_OPT_*
536495  * @timeout: timeout to wait for the load
537496  *
538497  * In charge of constructing a sysfs fallback interface for firmware loading.
539498  **/
540
-static int fw_load_sysfs_fallback(struct fw_sysfs *fw_sysfs,
541
-				  enum fw_opt opt_flags, long timeout)
499
+static int fw_load_sysfs_fallback(struct fw_sysfs *fw_sysfs, long timeout)
542500 {
543501 	int retval = 0;
544502 	struct device *f_dev = &fw_sysfs->dev;
....@@ -557,7 +515,7 @@
557515 	}
558516 
559517 	mutex_lock(&fw_lock);
560
-	if (fw_state_is_aborted(fw_priv)) {
518
+	if (fw_load_abort_all || fw_state_is_aborted(fw_priv)) {
561519 		mutex_unlock(&fw_lock);
562520 		retval = -EINTR;
563521 		goto out;
....@@ -565,7 +523,7 @@
565523 	list_add(&fw_priv->pending_list, &pending_fw_head);
566524 	mutex_unlock(&fw_lock);
567525 
568
-	if (opt_flags & FW_OPT_UEVENT) {
526
+	if (fw_priv->opt_flags & FW_OPT_UEVENT) {
569527 		fw_priv->need_uevent = true;
570528 		dev_set_uevent_suppress(f_dev, false);
571529 		dev_dbg(f_dev, "firmware: requesting %s\n", fw_priv->fw_name);
....@@ -596,7 +554,7 @@
596554 
597555 static int fw_load_from_user_helper(struct firmware *firmware,
598556 				    const char *name, struct device *device,
599
-				    enum fw_opt opt_flags)
557
+				    u32 opt_flags)
600558 {
601559 	struct fw_sysfs *fw_sysfs;
602560 	long timeout;
....@@ -626,10 +584,10 @@
626584 	}
627585 
628586 	fw_sysfs->fw_priv = firmware->priv;
629
-	ret = fw_load_sysfs_fallback(fw_sysfs, opt_flags, timeout);
587
+	ret = fw_load_sysfs_fallback(fw_sysfs, timeout);
630588 
631589 	if (!ret)
632
-		ret = assign_fw(firmware, device, opt_flags);
590
+		ret = assign_fw(firmware, device);
633591 
634592 out_unlock:
635593 	usermodehelper_read_unlock();
....@@ -637,7 +595,7 @@
637595 	return ret;
638596 }
639597 
640
-static bool fw_force_sysfs_fallback(enum fw_opt opt_flags)
598
+static bool fw_force_sysfs_fallback(u32 opt_flags)
641599 {
642600 	if (fw_fallback_config.force_sysfs_fallback)
643601 		return true;
....@@ -646,7 +604,7 @@
646604 	return true;
647605 }
648606 
649
-static bool fw_run_sysfs_fallback(enum fw_opt opt_flags)
607
+static bool fw_run_sysfs_fallback(u32 opt_flags)
650608 {
651609 	int ret;
652610 
....@@ -655,11 +613,11 @@
655613 		return false;
656614 	}
657615 
658
-	if ((opt_flags & FW_OPT_NOFALLBACK))
616
+	if ((opt_flags & FW_OPT_NOFALLBACK_SYSFS))
659617 		return false;
660618 
661619 	/* Also permit LSMs and IMA to fail firmware sysfs fallback */
662
-	ret = security_kernel_load_data(LOADING_FIRMWARE);
620
+	ret = security_kernel_load_data(LOADING_FIRMWARE, true);
663621 	if (ret < 0)
664622 		return false;
665623 
....@@ -671,31 +629,33 @@
671629  * @fw: pointer to firmware image
672630  * @name: name of firmware file to look for
673631  * @device: device for which firmware is being loaded
674
- * @opt_flags: options to control firmware loading behaviour
632
+ * @opt_flags: options to control firmware loading behaviour, as defined by
633
+ *	       &enum fw_opt
675634  * @ret: return value from direct lookup which triggered the fallback mechanism
676635  *
677636  * This function is called if direct lookup for the firmware failed, it enables
678637  * a fallback mechanism through userspace by exposing a sysfs loading
679
- * interface. Userspace is in charge of loading the firmware through the syfs
680
- * loading interface. This syfs fallback mechanism may be disabled completely
638
+ * interface. Userspace is in charge of loading the firmware through the sysfs
639
+ * loading interface. This sysfs fallback mechanism may be disabled completely
681640  * on a system by setting the proc sysctl value ignore_sysfs_fallback to true.
682
- * If this false we check if the internal API caller set the @FW_OPT_NOFALLBACK
683
- * flag, if so it would also disable the fallback mechanism. A system may want
684
- * to enfoce the sysfs fallback mechanism at all times, it can do this by
685
- * setting ignore_sysfs_fallback to false and force_sysfs_fallback to true.
641
+ * If this is false we check if the internal API caller set the
642
+ * @FW_OPT_NOFALLBACK_SYSFS flag, if so it would also disable the fallback
643
+ * mechanism. A system may want to enforce the sysfs fallback mechanism at all
644
+ * times, it can do this by setting ignore_sysfs_fallback to false and
645
+ * force_sysfs_fallback to true.
686646  * Enabling force_sysfs_fallback is functionally equivalent to build a kernel
687647  * with CONFIG_FW_LOADER_USER_HELPER_FALLBACK.
688648  **/
689649 int firmware_fallback_sysfs(struct firmware *fw, const char *name,
690650 			    struct device *device,
691
-			    enum fw_opt opt_flags,
651
+			    u32 opt_flags,
692652 			    int ret)
693653 {
694654 	if (!fw_run_sysfs_fallback(opt_flags))
695655 		return ret;
696656 
697657 	if (!(opt_flags & FW_OPT_NO_WARN))
698
-		dev_warn(device, "Falling back to syfs fallback for: %s\n",
658
+		dev_warn(device, "Falling back to sysfs fallback for: %s\n",
699659 				 name);
700660 	else
701661 		dev_dbg(device, "Falling back to sysfs fallback for: %s\n",