Merge tag 'mm-hotfixes-stable-2024-05-25-09-13' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull misc fixes from Andrew Morton:
 "16 hotfixes, 11 of which are cc:stable.

  A few nilfs2 fixes, the remainder are for MM: a couple of selftests
  fixes, various singletons fixing various issues in various parts"

* tag 'mm-hotfixes-stable-2024-05-25-09-13' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
  mm/ksm: fix possible UAF of stable_node
  mm/memory-failure: fix handling of dissolved but not taken off from buddy pages
  mm: /proc/pid/smaps_rollup: avoid skipping vma after getting mmap_lock again
  nilfs2: fix potential hang in nilfs_detach_log_writer()
  nilfs2: fix unexpected freezing of nilfs_segctor_sync()
  nilfs2: fix use-after-free of timer for log writer thread
  selftests/mm: fix build warnings on ppc64
  arm64: patching: fix handling of execmem addresses
  selftests/mm: compaction_test: fix bogus test success and reduce probability of OOM-killer invocation
  selftests/mm: compaction_test: fix incorrect write of zero to nr_hugepages
  selftests/mm: compaction_test: fix bogus test success on Aarch64
  mailmap: update email address for Satya Priya
  mm/huge_memory: don't unpoison huge_zero_folio
  kasan, fortify: properly rename memintrinsics
  lib: add version into /proc/allocinfo output
  mm/vmalloc: fix vmalloc which may return null if called with __GFP_NOFAIL

1 files changed, 32 insertions, 15 deletions

diff --git a/lib/alloc_tag.c b/lib/alloc_tag.c
index 531dbe2f5456..11ed973ac359 100644
--- a/lib/alloc_tag.c
+++ b/lib/alloc_tag.c
@@ -16,47 +16,60 @@ EXPORT_SYMBOL(_shared_alloc_tag);
 DEFINE_STATIC_KEY_MAYBE(CONFIG_MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT,
 			mem_alloc_profiling_key);
 
+struct allocinfo_private {
+	struct codetag_iterator iter;
+	bool print_header;
+};
+
 static void *allocinfo_start(struct seq_file *m, loff_t *pos)
 {
-	struct codetag_iterator *iter;
+	struct allocinfo_private *priv;
 	struct codetag *ct;
 	loff_t node = *pos;
 
-	iter = kzalloc(sizeof(*iter), GFP_KERNEL);
-	m->private = iter;
-	if (!iter)
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	m->private = priv;
+	if (!priv)
 		return NULL;
 
+	priv->print_header = (node == 0);
 	codetag_lock_module_list(alloc_tag_cttype, true);
-	*iter = codetag_get_ct_iter(alloc_tag_cttype);
-	while ((ct = codetag_next_ct(iter)) != NULL && node)
+	priv->iter = codetag_get_ct_iter(alloc_tag_cttype);
+	while ((ct = codetag_next_ct(&priv->iter)) != NULL && node)
 		node--;
 
-	return ct ? iter : NULL;
+	return ct ? priv : NULL;
 }
 
 static void *allocinfo_next(struct seq_file *m, void *arg, loff_t *pos)
 {
-	struct codetag_iterator *iter = (struct codetag_iterator *)arg;
-	struct codetag *ct = codetag_next_ct(iter);
+	struct allocinfo_private *priv = (struct allocinfo_private *)arg;
+	struct codetag *ct = codetag_next_ct(&priv->iter);
 
 	(*pos)++;
 	if (!ct)
 		return NULL;
 
-	return iter;
+	return priv;
 }
 
 static void allocinfo_stop(struct seq_file *m, void *arg)
 {
-	struct codetag_iterator *iter = (struct codetag_iterator *)m->private;
+	struct allocinfo_private *priv = (struct allocinfo_private *)m->private;
 
-	if (iter) {
+	if (priv) {
 		codetag_lock_module_list(alloc_tag_cttype, false);
-		kfree(iter);
+		kfree(priv);
 	}
 }
 
+static void print_allocinfo_header(struct seq_buf *buf)
+{
+	/* Output format version, so we can change it. */
+	seq_buf_printf(buf, "allocinfo - version: 1.0\n");
+	seq_buf_printf(buf, "#     <size>  <calls> <tag info>\n");
+}
+
 static void alloc_tag_to_text(struct seq_buf *out, struct codetag *ct)
 {
 	struct alloc_tag *tag = ct_to_alloc_tag(ct);
@@ -71,13 +84,17 @@ static void alloc_tag_to_text(struct seq_buf *out, struct codetag *ct)
 
 static int allocinfo_show(struct seq_file *m, void *arg)
 {
-	struct codetag_iterator *iter = (struct codetag_iterator *)arg;
+	struct allocinfo_private *priv = (struct allocinfo_private *)arg;
 	char *bufp;
 	size_t n = seq_get_buf(m, &bufp);
 	struct seq_buf buf;
 
 	seq_buf_init(&buf, bufp, n);
-	alloc_tag_to_text(&buf, iter->ct);
+	if (priv->print_header) {
+		print_allocinfo_header(&buf);
+		priv->print_header = false;
+	}
+	alloc_tag_to_text(&buf, priv->iter.ct);
 	seq_commit(m, seq_buf_used(&buf));
 	return 0;
 }