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KVM: use __vcalloc for very large allocations 

commit 37b2a6510a upstream.

Allocations whose size is related to the memslot size can be arbitrarily
large.  Do not use kvzalloc/kvcalloc, as those are limited to "not crazy"
sizes that fit in 32 bits.

Cc: stable@vger.kernel.org
Fixes: 7661809d49 ("mm: don't allow oversized kvmalloc() calls")
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Alexander Ofitserov <oficerovas@altlinux.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paolo Bonzini 2022-03-08 04:49:37 -05:00 committed by Greg Kroah-Hartman
parent 95670878a6
commit c71e1c1a08
4 changed files with 6 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/kvm/book3s_hv_uvmem.c
View File

@ -250,7 +250,7 @@ int kvmppc_uvmem_slot_init(struct kvm *kvm, const struct kvm_memory_slot *slot)
p = kzalloc(sizeof(*p), GFP_KERNEL);
if (!p)
return -ENOMEM;
p->pfns = vzalloc(array_size(slot->npages, sizeof(*p->pfns)));
p->pfns = vcalloc(slot->npages, sizeof(*p->pfns));
if (!p->pfns) {
kfree(p);
return -ENOMEM;

2
arch/x86/kvm/mmu/page_track.c
View File

@ -35,7 +35,7 @@ int kvm_page_track_create_memslot(struct kvm_memory_slot *slot,
for (i = 0; i < KVM_PAGE_TRACK_MAX; i++) {
slot->arch.gfn_track[i] =
kvcalloc(npages, sizeof(*slot->arch.gfn_track[i]),
__vcalloc(npages, sizeof(*slot->arch.gfn_track[i]),
GFP_KERNEL_ACCOUNT);
if (!slot->arch.gfn_track[i])
goto track_free;

4
arch/x86/kvm/x86.c
View File

@ -10826,14 +10826,14 @@ static int kvm_alloc_memslot_metadata(struct kvm_memory_slot *slot,
slot->base_gfn, level) + 1;
slot->arch.rmap[i] =
kvcalloc(lpages, sizeof(*slot->arch.rmap[i]),
__vcalloc(lpages, sizeof(*slot->arch.rmap[i]),
GFP_KERNEL_ACCOUNT);
if (!slot->arch.rmap[i])
goto out_free;
if (i == 0)
continue;
linfo = kvcalloc(lpages, sizeof(*linfo), GFP_KERNEL_ACCOUNT);
linfo = __vcalloc(lpages, sizeof(*linfo), GFP_KERNEL_ACCOUNT);
if (!linfo)
goto out_free;

4
virt/kvm/kvm_main.c
View File

@ -1008,9 +1008,9 @@ static int kvm_vm_release(struct inode *inode, struct file *filp)
*/
static int kvm_alloc_dirty_bitmap(struct kvm_memory_slot *memslot)
{
unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
unsigned long dirty_bytes = kvm_dirty_bitmap_bytes(memslot);
memslot->dirty_bitmap = kvzalloc(dirty_bytes, GFP_KERNEL_ACCOUNT);
memslot->dirty_bitmap = __vcalloc(2, dirty_bytes, GFP_KERNEL_ACCOUNT);
if (!memslot->dirty_bitmap)
return -ENOMEM;