Merge branch 'mm-hotfixes-stable' into mm-stable.

Pick these into mm-stable:

5de195060b2e mm: resolve faulty mmap_region() error path behaviour
5baf8b037deb mm: refactor arch_calc_vm_flag_bits() and arm64 MTE handling
0fb4a7ad270b mm: refactor map_deny_write_exec()
4080ef1579b2 mm: unconditionally close VMAs on error
3dd6ed34ce1f mm: avoid unsafe VMA hook invocation when error arises on mmap hook
f8f931bba0f9 mm/thp: fix deferred split unqueue naming and locking
e66f3185fa04 mm/thp: fix deferred split queue not partially_mapped

to get a clean merge of these from mm-unstable into mm-stable:

Subject: memcg-v1: fully deprecate move_charge_at_immigrate
Subject: memcg-v1: remove charge move code
Subject: memcg-v1: no need for memcg locking for dirty tracking
Subject: memcg-v1: no need for memcg locking for writeback tracking
Subject: memcg-v1: no need for memcg locking for MGLRU
Subject: memcg-v1: remove memcg move locking code
Subject: tools: testing: add additional vma_internal.h stubs
Subject: mm: isolate mmap internal logic to mm/vma.c
Subject: mm: refactor __mmap_region()
Subject: mm: remove unnecessary reset state logic on merge new VMA
Subject: mm: defer second attempt at merge on mmap()
Subject: mm/vma: the pgoff is correct if can_merge_right
Subject: memcg: workingset: remove folio_memcg_rcu usage

1 files changed, 22 insertions, 6 deletions

diff --git a/include/linux/mman.h b/include/linux/mman.h
index bcb201ab7a41..a842783ffa62 100644
--- a/include/linux/mman.h
+++ b/include/linux/mman.h
@@ -2,6 +2,7 @@
 #ifndef _LINUX_MMAN_H
 #define _LINUX_MMAN_H
 
+#include <linux/fs.h>
 #include <linux/mm.h>
 #include <linux/percpu_counter.h>
 
@@ -94,7 +95,7 @@ static inline void vm_unacct_memory(long pages)
 #endif
 
 #ifndef arch_calc_vm_flag_bits
-#define arch_calc_vm_flag_bits(flags) 0
+#define arch_calc_vm_flag_bits(file, flags) 0
 #endif
 
 #ifndef arch_validate_prot
@@ -151,13 +152,13 @@ calc_vm_prot_bits(unsigned long prot, unsigned long pkey)
  * Combine the mmap "flags" argument into "vm_flags" used internally.
  */
 static inline unsigned long
-calc_vm_flag_bits(unsigned long flags)
+calc_vm_flag_bits(struct file *file, unsigned long flags)
 {
 	return _calc_vm_trans(flags, MAP_GROWSDOWN,  VM_GROWSDOWN ) |
 	       _calc_vm_trans(flags, MAP_LOCKED,     VM_LOCKED    ) |
 	       _calc_vm_trans(flags, MAP_SYNC,	     VM_SYNC      ) |
 	       _calc_vm_trans(flags, MAP_STACK,	     VM_NOHUGEPAGE) |
-	       arch_calc_vm_flag_bits(flags);
+	       arch_calc_vm_flag_bits(file, flags);
 }
 
 unsigned long vm_commit_limit(void);
@@ -188,16 +189,31 @@ static inline bool arch_memory_deny_write_exec_supported(void)
  *
  *	d)	mmap(PROT_READ | PROT_EXEC)
  *		mmap(PROT_READ | PROT_EXEC | PROT_BTI)
+ *
+ * This is only applicable if the user has set the Memory-Deny-Write-Execute
+ * (MDWE) protection mask for the current process.
+ *
+ * @old specifies the VMA flags the VMA originally possessed, and @new the ones
+ * we propose to set.
+ *
+ * Return: false if proposed change is OK, true if not ok and should be denied.
  */
-static inline bool map_deny_write_exec(struct vm_area_struct *vma,  unsigned long vm_flags)
+static inline bool map_deny_write_exec(unsigned long old, unsigned long new)
 {
+	/* If MDWE is disabled, we have nothing to deny. */
 	if (!test_bit(MMF_HAS_MDWE, &current->mm->flags))
 		return false;
 
-	if ((vm_flags & VM_EXEC) && (vm_flags & VM_WRITE))
+	/* If the new VMA is not executable, we have nothing to deny. */
+	if (!(new & VM_EXEC))
+		return false;
+
+	/* Under MDWE we do not accept newly writably executable VMAs... */
+	if (new & VM_WRITE)
 		return true;
 
-	if (!(vma->vm_flags & VM_EXEC) && (vm_flags & VM_EXEC))
+	/* ...nor previously non-executable VMAs becoming executable. */
+	if (!(old & VM_EXEC))
 		return true;
 
 	return false;