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authorJan Beulich <jbeulich@suse.com>2021-09-22 13:17:48 +0300
committerJuergen Gross <jgross@suse.com>2021-10-05 09:20:22 +0300
commite11423d6721dd63b23fb41ade5e8d0b448b17780 (patch)
tree036904e290e3da6acd2b58e1938303d699e9a1f2 /drivers/xen
parent0432523f4807a83902857347bd73eb817ef0a742 (diff)
downloadlinux-e11423d6721dd63b23fb41ade5e8d0b448b17780.tar.xz
xen/privcmd: fix error handling in mmap-resource processing
xen_pfn_t is the same size as int only on 32-bit builds (and not even on Arm32). Hence pfns[] can't be used directly to read individual error values returned from xen_remap_domain_mfn_array(); every other error indicator would be skipped/ignored on 64-bit. Fixes: 3ad0876554ca ("xen/privcmd: add IOCTL_PRIVCMD_MMAP_RESOURCE") Cc: stable@vger.kernel.org Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Link: https://lore.kernel.org/r/aa6d6a67-6889-338a-a910-51e889f792d5@suse.com Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/privcmd.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
index a3f2031aa3d9..5af2a295e32f 100644
--- a/drivers/xen/privcmd.c
+++ b/drivers/xen/privcmd.c
@@ -803,11 +803,12 @@ static long privcmd_ioctl_mmap_resource(struct file *file,
unsigned int domid =
(xdata.flags & XENMEM_rsrc_acq_caller_owned) ?
DOMID_SELF : kdata.dom;
- int num;
+ int num, *errs = (int *)pfns;
+ BUILD_BUG_ON(sizeof(*errs) > sizeof(*pfns));
num = xen_remap_domain_mfn_array(vma,
kdata.addr & PAGE_MASK,
- pfns, kdata.num, (int *)pfns,
+ pfns, kdata.num, errs,
vma->vm_page_prot,
domid,
vma->vm_private_data);
@@ -817,7 +818,7 @@ static long privcmd_ioctl_mmap_resource(struct file *file,
unsigned int i;
for (i = 0; i < num; i++) {
- rc = pfns[i];
+ rc = errs[i];
if (rc < 0)
break;
}