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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/arch/m68k/kernel/sys_m68k.c
..
..
@@ -388,6 +388,8 @@
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 		ret = -EPERM;
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 		if (!capable(CAP_SYS_ADMIN))
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 			goto out;
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+
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+		mmap_read_lock(current->mm);
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 	} else {
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 		struct vm_area_struct *vma;
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395
 
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@@ -399,7 +401,7 @@
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 		 * Verify that the specified address region actually belongs
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 		 * to this process.
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 		 */
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-		down_read(&current->mm->mmap_sem);
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+		mmap_read_lock(current->mm);
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 		vma = find_vma(current->mm, addr);
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 		if (!vma || addr < vma->vm_start || addr + len > vma->vm_end)
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 			goto out_unlock;
..
..
@@ -450,7 +452,7 @@
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 	    }
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 	}
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 out_unlock:
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-	up_read(&current->mm->mmap_sem);
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+	mmap_read_unlock(current->mm);
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 out:
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 	return ret;
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 }
..
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@@ -465,16 +467,24 @@
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 	for (;;) {
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 		struct mm_struct *mm = current->mm;
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 		pgd_t *pgd;
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+		p4d_t *p4d;
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+		pud_t *pud;
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 		pmd_t *pmd;
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 		pte_t *pte;
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 		spinlock_t *ptl;
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 		unsigned long mem_value;
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476
 
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-		down_read(&mm->mmap_sem);
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+		mmap_read_lock(mm);
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 		pgd = pgd_offset(mm, (unsigned long)mem);
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 		if (!pgd_present(*pgd))
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 			goto bad_access;
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-		pmd = pmd_offset(pgd, (unsigned long)mem);
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+		p4d = p4d_offset(pgd, (unsigned long)mem);
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+		if (!p4d_present(*p4d))
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+			goto bad_access;
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+		pud = pud_offset(p4d, (unsigned long)mem);
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+		if (!pud_present(*pud))
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+			goto bad_access;
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+		pmd = pmd_offset(pud, (unsigned long)mem);
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 		if (!pmd_present(*pmd))
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 			goto bad_access;
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 		pte = pte_offset_map_lock(mm, pmd, (unsigned long)mem, &ptl);
..
..
@@ -493,11 +503,11 @@
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 			__put_user(newval, mem);
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504
 
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 		pte_unmap_unlock(pte, ptl);
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-		up_read(&mm->mmap_sem);
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+		mmap_read_unlock(mm);
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 		return mem_value;
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508
 
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 	      bad_access:
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-		up_read(&mm->mmap_sem);
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+		mmap_read_unlock(mm);
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 		/* This is not necessarily a bad access, we can get here if
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 		   a memory we're trying to write to should be copied-on-write.
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 		   Make the kernel do the necessary page stuff, then re-iterate.
..
..
@@ -537,13 +547,13 @@
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 	struct mm_struct *mm = current->mm;
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 	unsigned long mem_value;
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549
 
540
-	down_read(&mm->mmap_sem);
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+	mmap_read_lock(mm);
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551
 
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 	mem_value = *mem;
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 	if (mem_value == oldval)
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 		*mem = newval;
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555
 
546
-	up_read(&mm->mmap_sem);
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+	mmap_read_unlock(mm);
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 	return mem_value;
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 }
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