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Re: New Defects reported by Coverity Scan for XenProject
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 24 Jun 2026 15:04:37 +0200
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- Cc: Juergen Gross <jgross@xxxxxxxx>, Julien Grall <julien@xxxxxxx>
- Delivery-date: Wed, 24 Jun 2026 13:04:49 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 24.06.2026 14:33, scan-admin@xxxxxxxxxxxx wrote:
> ** CID 1695359: Insecure data handling (INTEGER_OVERFLOW)
> /tools/xenstored/domain.c: 601 in domain_tree_remove_sub()
>
>
> _____________________________________________________________________________________________
> *** CID 1695359: Insecure data handling (INTEGER_OVERFLOW)
> /tools/xenstored/domain.c: 601 in domain_tree_remove_sub()
> 595 node_changed = true;
> 596 }
> 597
> 598 for (i = 1; i < node->hdr.num_perms; i++) {
> 599 if (node->perms[i].id != domain->domid)
> 600 continue;
>>>> CID 1695359: Insecure data handling (INTEGER_OVERFLOW)
>>>> "8UL * (node->hdr.num_perms - i - 1U)", which might have underflowed,
>>>> is passed to "memmove(node->perms + i, node->perms + i + 1, 8UL *
>>>> (node->hdr.num_perms - i - 1U))". [Note: The source code implementation of
>>>> the function has been overridden by a builtin model.]
> 601 memmove(node->perms + i, node->perms + i + 1,
> 602 sizeof(*node->perms) * (node->hdr.num_perms - i
> - 1));
I'm struggling with this one: As i < node->hdr.num_perms, the last argument
passed to memmove() can be 0, but I can't see potential for underflow.
Jan
> 603 node->hdr.num_perms--;
> 604 i--;
> 605 node_changed = true;
> 606 }
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