diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index c1756fd8d10b..e7e9d0cde51a 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -2125,32 +2125,6 @@ static void free_note_info(struct elf_note_info *info)
 
 #endif
 
-static struct vm_area_struct *first_vma(struct task_struct *tsk,
-					struct vm_area_struct *gate_vma)
-{
-	struct vm_area_struct *ret = tsk->mm->mmap;
-
-	if (ret)
-		return ret;
-	return gate_vma;
-}
-/*
- * Helper function for iterating across a vma list.  It ensures that the caller
- * will visit `gate_vma' prior to terminating the search.
- */
-static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma,
-					struct vm_area_struct *gate_vma)
-{
-	struct vm_area_struct *ret;
-
-	ret = this_vma->vm_next;
-	if (ret)
-		return ret;
-	if (this_vma == gate_vma)
-		return NULL;
-	return gate_vma;
-}
-
 static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
 			     elf_addr_t e_shoff, int segs)
 {
@@ -2177,9 +2151,8 @@ static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
 static int elf_core_dump(struct coredump_params *cprm)
 {
 	int has_dumped = 0;
-	int segs, i;
-	size_t vma_data_size = 0;
-	struct vm_area_struct *vma, *gate_vma;
+	int vma_count, segs, i;
+	size_t vma_data_size;
 	struct elfhdr elf;
 	loff_t offset = 0, dataoff;
 	struct elf_note_info info = { };
@@ -2187,30 +2160,16 @@ static int elf_core_dump(struct coredump_params *cprm)
 	struct elf_shdr *shdr4extnum = NULL;
 	Elf_Half e_phnum;
 	elf_addr_t e_shoff;
-	elf_addr_t *vma_filesz = NULL;
+	struct core_vma_metadata *vma_meta;
+
+	if (dump_vma_snapshot(cprm, &vma_count, &vma_meta, &vma_data_size))
+		return 0;
 
-	/*
-	 * We no longer stop all VM operations.
-	 * 
-	 * This is because those proceses that could possibly change map_count
-	 * or the mmap / vma pages are now blocked in do_exit on current
-	 * finishing this core dump.
-	 *
-	 * Only ptrace can touch these memory addresses, but it doesn't change
-	 * the map_count or the pages allocated. So no possibility of crashing
-	 * exists while dumping the mm->vm_next areas to the core file.
-	 */
-  
 	/*
 	 * The number of segs are recored into ELF header as 16bit value.
 	 * Please check DEFAULT_MAX_MAP_COUNT definition when you modify here.
 	 */
-	segs = current->mm->map_count;
-	segs += elf_core_extra_phdrs();
-
-	gate_vma = get_gate_vma(current->mm);
-	if (gate_vma != NULL)
-		segs++;
+	segs = vma_count + elf_core_extra_phdrs();
 
 	/* for notes section */
 	segs++;
@@ -2248,24 +2207,6 @@ static int elf_core_dump(struct coredump_params *cprm)
 
 	dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
 
-	/*
-	 * Zero vma process will get ZERO_SIZE_PTR here.
-	 * Let coredump continue for register state at least.
-	 */
-	vma_filesz = kvmalloc(array_size(sizeof(*vma_filesz), (segs - 1)),
-			      GFP_KERNEL);
-	if (!vma_filesz)
-		goto end_coredump;
-
-	for (i = 0, vma = first_vma(current, gate_vma); vma != NULL;
-			vma = next_vma(vma, gate_vma)) {
-		unsigned long dump_size;
-
-		dump_size = vma_dump_size(vma, cprm->mm_flags);
-		vma_filesz[i++] = dump_size;
-		vma_data_size += dump_size;
-	}
-
 	offset += vma_data_size;
 	offset += elf_core_extra_data_size();
 	e_shoff = offset;
@@ -2286,21 +2227,23 @@ static int elf_core_dump(struct coredump_params *cprm)
 		goto end_coredump;
 
 	/* Write program headers for segments dump */
-	for (i = 0, vma = first_vma(current, gate_vma); vma != NULL;
-			vma = next_vma(vma, gate_vma)) {
+	for (i = 0; i < vma_count; i++) {
+		struct core_vma_metadata *meta = vma_meta + i;
 		struct elf_phdr phdr;
 
 		phdr.p_type = PT_LOAD;
 		phdr.p_offset = offset;
-		phdr.p_vaddr = vma->vm_start;
+		phdr.p_vaddr = meta->start;
 		phdr.p_paddr = 0;
-		phdr.p_filesz = vma_filesz[i++];
-		phdr.p_memsz = vma->vm_end - vma->vm_start;
+		phdr.p_filesz = meta->dump_size;
+		phdr.p_memsz = meta->end - meta->start;
 		offset += phdr.p_filesz;
-		phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
-		if (vma->vm_flags & VM_WRITE)
+		phdr.p_flags = 0;
+		if (meta->flags & VM_READ)
+			phdr.p_flags |= PF_R;
+		if (meta->flags & VM_WRITE)
 			phdr.p_flags |= PF_W;
-		if (vma->vm_flags & VM_EXEC)
+		if (meta->flags & VM_EXEC)
 			phdr.p_flags |= PF_X;
 		phdr.p_align = ELF_EXEC_PAGESIZE;
 
@@ -2322,9 +2265,10 @@ static int elf_core_dump(struct coredump_params *cprm)
 	if (!dump_skip(cprm, dataoff - cprm->pos))
 		goto end_coredump;
 
-	for (i = 0, vma = first_vma(current, gate_vma); vma != NULL;
-			vma = next_vma(vma, gate_vma)) {
-		if (!dump_user_range(cprm, vma->vm_start, vma_filesz[i++]))
+	for (i = 0; i < vma_count; i++) {
+		struct core_vma_metadata *meta = vma_meta + i;
+
+		if (!dump_user_range(cprm, meta->start, meta->dump_size))
 			goto end_coredump;
 	}
 	dump_truncate(cprm);
@@ -2340,7 +2284,7 @@ static int elf_core_dump(struct coredump_params *cprm)
 end_coredump:
 	free_note_info(&info);
 	kfree(shdr4extnum);
-	kvfree(vma_filesz);
+	kvfree(vma_meta);
 	kfree(phdr4note);
 	return has_dumped;
 }
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index f531c6198864..be4062b8ba75 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -1454,29 +1454,21 @@ static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
 /*
  * dump the segments for an MMU process
  */
-static bool elf_fdpic_dump_segments(struct coredump_params *cprm)
+static bool elf_fdpic_dump_segments(struct coredump_params *cprm,
+				    struct core_vma_metadata *vma_meta,
+				    int vma_count)
 {
-	struct vm_area_struct *vma;
+	int i;
 
-	for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
-		unsigned long size = vma_dump_size(vma, cprm->mm_flags);
+	for (i = 0; i < vma_count; i++) {
+		struct core_vma_metadata *meta = vma_meta + i;
 
-		if (!dump_user_range(cprm, vma->vm_start, size))
+		if (!dump_user_range(cprm, meta->start, meta->dump_size))
 			return false;
 	}
 	return true;
 }
 
-static size_t elf_core_vma_data_size(unsigned long mm_flags)
-{
-	struct vm_area_struct *vma;
-	size_t size = 0;
-
-	for (vma = current->mm->mmap; vma; vma = vma->vm_next)
-		size += vma_dump_size(vma, mm_flags);
-	return size;
-}
-
 /*
  * Actual dumper
  *
@@ -1487,9 +1479,8 @@ static size_t elf_core_vma_data_size(unsigned long mm_flags)
 static int elf_fdpic_core_dump(struct coredump_params *cprm)
 {
 	int has_dumped = 0;
-	int segs;
+	int vma_count, segs;
 	int i;
-	struct vm_area_struct *vma;
 	struct elfhdr *elf = NULL;
 	loff_t offset = 0, dataoff;
 	struct memelfnote psinfo_note, auxv_note;
@@ -1503,18 +1494,8 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
 	elf_addr_t e_shoff;
 	struct core_thread *ct;
 	struct elf_thread_status *tmp;
-
-	/*
-	 * We no longer stop all VM operations.
-	 *
-	 * This is because those proceses that could possibly change map_count
-	 * or the mmap / vma pages are now blocked in do_exit on current
-	 * finishing this core dump.
-	 *
-	 * Only ptrace can touch these memory addresses, but it doesn't change
-	 * the map_count or the pages allocated. So no possibility of crashing
-	 * exists while dumping the mm->vm_next areas to the core file.
-	 */
+	struct core_vma_metadata *vma_meta = NULL;
+	size_t vma_data_size;
 
 	/* alloc memory for large data structures: too large to be on stack */
 	elf = kmalloc(sizeof(*elf), GFP_KERNEL);
@@ -1524,6 +1505,9 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
 	if (!psinfo)
 		goto end_coredump;
 
+	if (dump_vma_snapshot(cprm, &vma_count, &vma_meta, &vma_data_size))
+		goto end_coredump;
+
 	for (ct = current->mm->core_state->dumper.next;
 					ct; ct = ct->next) {
 		tmp = elf_dump_thread_status(cprm->siginfo->si_signo,
@@ -1543,8 +1527,7 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
 	tmp->next = thread_list;
 	thread_list = tmp;
 
-	segs = current->mm->map_count;
-	segs += elf_core_extra_phdrs();
+	segs = vma_count + elf_core_extra_phdrs();
 
 	/* for notes section */
 	segs++;
@@ -1589,7 +1572,7 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
 	/* Page-align dumped data */
 	dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
 
-	offset += elf_core_vma_data_size(cprm->mm_flags);
+	offset += vma_data_size;
 	offset += elf_core_extra_data_size();
 	e_shoff = offset;
 
@@ -1609,23 +1592,26 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
 		goto end_coredump;
 
 	/* write program headers for segments dump */
-	for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
+	for (i = 0; i < vma_count; i++) {
+		struct core_vma_metadata *meta = vma_meta + i;
 		struct elf_phdr phdr;
 		size_t sz;
 
-		sz = vma->vm_end - vma->vm_start;
+		sz = meta->end - meta->start;
 
 		phdr.p_type = PT_LOAD;
 		phdr.p_offset = offset;
-		phdr.p_vaddr = vma->vm_start;
+		phdr.p_vaddr = meta->start;
 		phdr.p_paddr = 0;
-		phdr.p_filesz = vma_dump_size(vma, cprm->mm_flags);
+		phdr.p_filesz = meta->dump_size;
 		phdr.p_memsz = sz;
 		offset += phdr.p_filesz;
-		phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
-		if (vma->vm_flags & VM_WRITE)
+		phdr.p_flags = 0;
+		if (meta->flags & VM_READ)
+			phdr.p_flags |= PF_R;
+		if (meta->flags & VM_WRITE)
 			phdr.p_flags |= PF_W;
-		if (vma->vm_flags & VM_EXEC)
+		if (meta->flags & VM_EXEC)
 			phdr.p_flags |= PF_X;
 		phdr.p_align = ELF_EXEC_PAGESIZE;
 
@@ -1657,7 +1643,7 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
 	if (!dump_skip(cprm, dataoff - cprm->pos))
 		goto end_coredump;
 
-	if (!elf_fdpic_dump_segments(cprm))
+	if (!elf_fdpic_dump_segments(cprm, vma_meta, vma_count))
 		goto end_coredump;
 
 	if (!elf_core_write_extra_data(cprm))
@@ -1681,6 +1667,7 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
 		thread_list = thread_list->next;
 		kfree(tmp);
 	}
+	kvfree(vma_meta);
 	kfree(phdr4note);
 	kfree(elf);
 	kfree(psinfo);
diff --git a/fs/coredump.c b/fs/coredump.c
index 4ef4c49a65b7..0cd9056d79cc 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -971,7 +971,8 @@ static bool always_dump_vma(struct vm_area_struct *vma)
 /*
  * Decide how much of @vma's contents should be included in a core dump.
  */
-unsigned long vma_dump_size(struct vm_area_struct *vma, unsigned long mm_flags)
+static unsigned long vma_dump_size(struct vm_area_struct *vma,
+				   unsigned long mm_flags)
 {
 #define FILTER(type)	(mm_flags & (1UL << MMF_DUMP_##type))
 
@@ -1037,3 +1038,81 @@ unsigned long vma_dump_size(struct vm_area_struct *vma, unsigned long mm_flags)
 whole:
 	return vma->vm_end - vma->vm_start;
 }
+
+static struct vm_area_struct *first_vma(struct task_struct *tsk,
+					struct vm_area_struct *gate_vma)
+{
+	struct vm_area_struct *ret = tsk->mm->mmap;
+
+	if (ret)
+		return ret;
+	return gate_vma;
+}
+
+/*
+ * Helper function for iterating across a vma list.  It ensures that the caller
+ * will visit `gate_vma' prior to terminating the search.
+ */
+static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma,
+				       struct vm_area_struct *gate_vma)
+{
+	struct vm_area_struct *ret;
+
+	ret = this_vma->vm_next;
+	if (ret)
+		return ret;
+	if (this_vma == gate_vma)
+		return NULL;
+	return gate_vma;
+}
+
+/*
+ * Under the mmap_lock, take a snapshot of relevant information about the task's
+ * VMAs.
+ */
+int dump_vma_snapshot(struct coredump_params *cprm, int *vma_count,
+		      struct core_vma_metadata **vma_meta,
+		      size_t *vma_data_size_ptr)
+{
+	struct vm_area_struct *vma, *gate_vma;
+	struct mm_struct *mm = current->mm;
+	int i;
+	size_t vma_data_size = 0;
+
+	/*
+	 * Once the stack expansion code is fixed to not change VMA bounds
+	 * under mmap_lock in read mode, this can be changed to take the
+	 * mmap_lock in read mode.
+	 */
+	if (mmap_write_lock_killable(mm))
+		return -EINTR;
+
+	gate_vma = get_gate_vma(mm);
+	*vma_count = mm->map_count + (gate_vma ? 1 : 0);
+
+	*vma_meta = kvmalloc_array(*vma_count, sizeof(**vma_meta), GFP_KERNEL);
+	if (!*vma_meta) {
+		mmap_write_unlock(mm);
+		return -ENOMEM;
+	}
+
+	for (i = 0, vma = first_vma(current, gate_vma); vma != NULL;
+			vma = next_vma(vma, gate_vma), i++) {
+		struct core_vma_metadata *m = (*vma_meta) + i;
+
+		m->start = vma->vm_start;
+		m->end = vma->vm_end;
+		m->flags = vma->vm_flags;
+		m->dump_size = vma_dump_size(vma, cprm->mm_flags);
+
+		vma_data_size += m->dump_size;
+	}
+
+	mmap_write_unlock(mm);
+
+	if (WARN_ON(i != *vma_count))
+		return -EFAULT;
+
+	*vma_data_size_ptr = vma_data_size;
+	return 0;
+}
diff --git a/include/linux/coredump.h b/include/linux/coredump.h
index bfecb8d79a7f..e58e8c207782 100644
--- a/include/linux/coredump.h
+++ b/include/linux/coredump.h
@@ -7,6 +7,12 @@
 #include <linux/fs.h>
 #include <asm/siginfo.h>
 
+struct core_vma_metadata {
+	unsigned long start, end;
+	unsigned long flags;
+	unsigned long dump_size;
+};
+
 /*
  * These are the only things you should do on a core-file: use only these
  * functions to write out all the necessary info.
@@ -16,9 +22,11 @@ extern int dump_skip(struct coredump_params *cprm, size_t nr);
 extern int dump_emit(struct coredump_params *cprm, const void *addr, int nr);
 extern int dump_align(struct coredump_params *cprm, int align);
 extern void dump_truncate(struct coredump_params *cprm);
-unsigned long vma_dump_size(struct vm_area_struct *vma, unsigned long mm_flags);
 int dump_user_range(struct coredump_params *cprm, unsigned long start,
 		    unsigned long len);
+int dump_vma_snapshot(struct coredump_params *cprm, int *vma_count,
+		      struct core_vma_metadata **vma_meta,
+		      size_t *vma_data_size_ptr);
 #ifdef CONFIG_COREDUMP
 extern void do_coredump(const kernel_siginfo_t *siginfo);
 #else