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xen/blkfront: fix leaking data in shared pages 

When allocating pages to be used for shared communication with the
backend always zero them, this avoids leaking unintended data present
on the pages.

This is CVE-2022-26365, part of XSA-403.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Roger Pau Monne 2022-07-01 08:23:54 +02:00 committed by Juergen Gross
parent a175eca0f3
commit 2f446ffe9d
1 changed files with 3 additions and 2 deletions
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5
drivers/block/xen-blkfront.c
View File

@ -311,7 +311,7 @@ static int fill_grant_buffer(struct blkfront_ring_info *rinfo, int num)
goto out_of_memory;
if (info->feature_persistent) {
granted_page = alloc_page(GFP_NOIO);
granted_page = alloc_page(GFP_NOIO | __GFP_ZERO);
if (!granted_page) {
kfree(gnt_list_entry);
goto out_of_memory;
@ -2183,7 +2183,8 @@ static int blkfront_setup_indirect(struct blkfront_ring_info *rinfo)
BUG_ON(!list_empty(&rinfo->indirect_pages));
for (i = 0; i < num; i++) {
struct page *indirect_page = alloc_page(GFP_KERNEL);
struct page *indirect_page = alloc_page(GFP_KERNEL |
__GFP_ZERO);
if (!indirect_page)
goto out_of_memory;
list_add(&indirect_page->lru, &rinfo->indirect_pages);