xen/scsifront: don't use gnttab_query_foreign_access() for mapped status
stable inclusion from linux-4.19.234 commit 62a696c15cfcfd32527f81ca3d94f2bde57475dc -------------------------------- Commit 33172ab5 upstream. It isn't enough to check whether a grant is still being in use by calling gnttab_query_foreign_access(), as a mapping could be realized by the other side just after having called that function. In case the call was done in preparation of revoking a grant it is better to do so via gnttab_try_end_foreign_access() and check the success of that operation instead. This is CVE-2022-23038 / part of XSA-396. Reported-by: NDemi Marie Obenour <demi@invisiblethingslab.com> Signed-off-by: NJuergen Gross <jgross@suse.com> Reviewed-by: NJan Beulich <jbeulich@suse.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NYongqiang Liu <liuyongqiang13@huawei.com> Reviewed-by: NXiu Jianfeng <xiujianfeng@huawei.com> Reviewed-by: NJason Yan <yanaijie@huawei.com> Signed-off-by: NLaibin Qiu <qiulaibin@huawei.com>
Showing
想要评论请 注册 或 登录