pstore updates for v7.1-rc1

- fix ftrace dump, when ECC is enabled (Andrey Skvortsov)
 
 - fix resource leak when ioremap() fails (Cole Leavitt)
 
 - Remove useless memblock header (Guilherme G. Piccoli)
 
 - Fix ECC parameter help text (Guilherme G. Piccoli)
 
 - Keep ftrace module parameter and debugfs switch in sync
   (Guilherme G. Piccoli)
 
 - Factor KASLR offset in the core kernel instruction addresses
   (Guilherme G. Piccoli)
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Merge tag 'pstore-v7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull pstore updates from Kees Cook:

 - fix ftrace dump when ECC is enabled (Andrey Skvortsov)

 - fix resource leak when ioremap() fails (Cole Leavitt)

 - Remove useless memblock header (Guilherme G. Piccoli)

 - Fix ECC parameter help text (Guilherme G. Piccoli)

 - Keep ftrace module parameter and debugfs switch in sync (Guilherme G.
   Piccoli)

 - Factor KASLR offset in the core kernel instruction addresses
   (Guilherme G. Piccoli)

* tag 'pstore-v7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  pstore/ftrace: Factor KASLR offset in the core kernel instruction addresses
  pstore/ftrace: Keep ftrace module parameter and debugfs switch in sync
  pstore/ram: fix resource leak when ioremap() fails
  pstore/ramoops: Fix ECC parameter help text
  pstore/ramoops: Remove useless memblock header
  pstore: fix ftrace dump, when ECC is enabled

fs/pstore/ftrace.c

@@ -18,11 +18,35 @@
 #include <linux/cache.h>
 #include <linux/slab.h>
 #include <asm/barrier.h>
+#include <asm/setup.h>
 #include "internal.h"
 
 /* This doesn't need to be atomic: speed is chosen over correctness here. */
 static u64 pstore_ftrace_stamp;
 
+static inline unsigned long adjust_ip(unsigned long ip)
+{
+#if defined(CONFIG_RANDOMIZE_BASE) && !defined(PSTORE_CPU_IN_IP) && IS_BUILTIN(CONFIG_PSTORE)
+	if (core_kernel_text(ip))
+		return ip - kaslr_offset();
+
+	__clear_bit(BITS_PER_LONG - 1, &ip);
+#endif
+	return ip;
+}
+
+inline unsigned long decode_ip(unsigned long ip)
+{
+#if defined(CONFIG_RANDOMIZE_BASE) && !defined(PSTORE_CPU_IN_IP) && IS_BUILTIN(CONFIG_PSTORE)
+	if (test_bit(BITS_PER_LONG - 1, &ip))
+		return ip + kaslr_offset();
+
+	__set_bit(BITS_PER_LONG - 1, &ip);
+
+#endif
+	return ip;
+}
+
 static void notrace pstore_ftrace_call(unsigned long ip,
 				       unsigned long parent_ip,
 				       struct ftrace_ops *op,
@@ -47,8 +71,8 @@ static void notrace pstore_ftrace_call(unsigned long ip,
 
 	local_irq_save(flags);
 
-	rec.ip = ip;
-	rec.parent_ip = parent_ip;
+	rec.ip = adjust_ip(ip);
+	rec.parent_ip = adjust_ip(parent_ip);
 	pstore_ftrace_write_timestamp(&rec, pstore_ftrace_stamp++);
 	pstore_ftrace_encode_cpu(&rec, raw_smp_processor_id());
 	psinfo->write(&record);
@@ -62,13 +86,16 @@ static struct ftrace_ops pstore_ftrace_ops __read_mostly = {
 };
 
 static DEFINE_MUTEX(pstore_ftrace_lock);
-static bool pstore_ftrace_enabled;
+static bool record_ftrace;
+module_param(record_ftrace, bool, 0400);
+MODULE_PARM_DESC(record_ftrace,
+		 "enable ftrace recording immediately (default: off)");
 
 static int pstore_set_ftrace_enabled(bool on)
 {
 	ssize_t ret;
 
-	if (on == pstore_ftrace_enabled)
+	if (on == record_ftrace)
 		return 0;
 
 	if (on) {
@@ -82,7 +109,7 @@ static int pstore_set_ftrace_enabled(bool on)
 		pr_err("%s: unable to %sregister ftrace ops: %zd\n",
 		       __func__, on ? "" : "un", ret);
 	} else {
-		pstore_ftrace_enabled = on;
+		record_ftrace = on;
 	}
 
 	return ret;
@@ -111,7 +138,7 @@ static ssize_t pstore_ftrace_knob_write(struct file *f, const char __user *buf,
 static ssize_t pstore_ftrace_knob_read(struct file *f, char __user *buf,
 				       size_t count, loff_t *ppos)
 {
-	char val[] = { '0' + pstore_ftrace_enabled, '\n' };
+	char val[] = { '0' + record_ftrace, '\n' };
 
 	return simple_read_from_buffer(buf, count, ppos, val, sizeof(val));
 }
@@ -124,11 +151,6 @@ static const struct file_operations pstore_knob_fops = {
 
 static struct dentry *pstore_ftrace_dir;
 
-static bool record_ftrace;
-module_param(record_ftrace, bool, 0400);
-MODULE_PARM_DESC(record_ftrace,
-		 "enable ftrace recording immediately (default: off)");
-
 void pstore_register_ftrace(void)
 {
 	if (!psinfo->write)
@@ -145,9 +167,9 @@ void pstore_register_ftrace(void)
 void pstore_unregister_ftrace(void)
 {
 	mutex_lock(&pstore_ftrace_lock);
-	if (pstore_ftrace_enabled) {
+	if (record_ftrace) {
 		unregister_ftrace_function(&pstore_ftrace_ops);
-		pstore_ftrace_enabled = false;
+		record_ftrace = false;
 	}
 	mutex_unlock(&pstore_ftrace_lock);
 

fs/pstore/inode.c

@@ -74,9 +74,9 @@ static void *pstore_ftrace_seq_start(struct seq_file *s, loff_t *pos)
 	if (!data)
 		return NULL;
 
-	data->off = ps->total_size % REC_SIZE;
+	data->off = ps->record->size % REC_SIZE;
 	data->off += *pos * REC_SIZE;
-	if (data->off + REC_SIZE > ps->total_size)
+	if (data->off + REC_SIZE > ps->record->size)
 		return NULL;
 
 	return_ptr(data);
@@ -94,7 +94,7 @@ static void *pstore_ftrace_seq_next(struct seq_file *s, void *v, loff_t *pos)
 
 	(*pos)++;
 	data->off += REC_SIZE;
-	if (data->off + REC_SIZE > ps->total_size)
+	if (data->off + REC_SIZE > ps->record->size)
 		return NULL;
 
 	return data;
@@ -105,17 +105,19 @@ static int pstore_ftrace_seq_show(struct seq_file *s, void *v)
 	struct pstore_private *ps = s->private;
 	struct pstore_ftrace_seq_data *data = v;
 	struct pstore_ftrace_record *rec;
+	unsigned long ip, parent_ip;
 
 	if (!data)
 		return 0;
 
 	rec = (struct pstore_ftrace_record *)(ps->record->buf + data->off);
 
+	ip = decode_ip(rec->ip);
+	parent_ip = decode_ip(rec->parent_ip);
 	seq_printf(s, "CPU:%d ts:%llu %08lx  %08lx  %ps <- %pS\n",
 		   pstore_ftrace_decode_cpu(rec),
 		   pstore_ftrace_read_timestamp(rec),
-		   rec->ip, rec->parent_ip, (void *)rec->ip,
-		   (void *)rec->parent_ip);
+		   ip, parent_ip, (void *)ip, (void *)parent_ip);
 
 	return 0;
 }

fs/pstore/internal.h

@@ -9,6 +9,7 @@
 extern unsigned int kmsg_bytes;
 
 #ifdef CONFIG_PSTORE_FTRACE
+extern unsigned long decode_ip(unsigned long ip);
 extern void pstore_register_ftrace(void);
 extern void pstore_unregister_ftrace(void);
 ssize_t pstore_ftrace_combine_log(char **dest_log, size_t *dest_log_size,
@@ -16,6 +17,7 @@ ssize_t pstore_ftrace_combine_log(char **dest_log, size_t *dest_log_size,
 #else
 static inline void pstore_register_ftrace(void) {}
 static inline void pstore_unregister_ftrace(void) {}
+static inline unsigned long decode_ip(unsigned long ip) { return ip; }
 static inline ssize_t
 pstore_ftrace_combine_log(char **dest_log, size_t *dest_log_size,
 			  const char *src_log, size_t src_log_size)

fs/pstore/ram.c

@@ -71,7 +71,7 @@ MODULE_PARM_DESC(max_reason,
 
 static int ramoops_ecc;
 module_param_named(ecc, ramoops_ecc, int, 0400);
-MODULE_PARM_DESC(ramoops_ecc,
+MODULE_PARM_DESC(ecc,
 		"if non-zero, the option enables ECC support and specifies "
 		"ECC buffer size in bytes (1 is a special value, means 16 "
 		"bytes ECC)");

fs/pstore/ram_core.c

@@ -12,7 +12,6 @@
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/list.h>
-#include <linux/memblock.h>
 #include <linux/rslib.h>
 #include <linux/slab.h>
 #include <linux/uaccess.h>
@@ -488,6 +487,10 @@ static void *persistent_ram_iomap(phys_addr_t start, size_t size,
 	else
 		va = ioremap_wc(start, size);
 
+	/* We must release the mem region if ioremap fails. */
+	if (!va)
+		release_mem_region(start, size);
+
 	/*
 	 * Since request_mem_region() and ioremap() are byte-granularity
 	 * there is no need handle anything special like we do when the