In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
KVM: arm64: vgic: Handle race between interrupt affinity change and LPI disabling<\/p>\n
Hyunwoo Kim reports some really bad races should the following
\nsituation occur:<\/p>\n
– LPI-I is pending in vcpu-B’s AP list
\n– vcpu-A writes to vcpu-B’s RD to disable its LPIs
\n– vcpu-C moves I from B to C<\/p>\n
If the last two race nicely enough, vgic_prune_ap_list() can drop
\nthe irq and AP list locks, reacquire them, and in the interval
\nthe irq has been freed. UAF follows.<\/p>\n
The fix is two-fold:<\/p>\n
– Before dropping the irq and ap_list locks, take a reference on
\n the irq<\/p>\n
– Do not try to handle migration of the pending bit: there is no
\n expectation that this state is retained, as per the architecture<\/p>\n
With that, we’re sure that the interrupt is still around, and we
\nsafely remove it from the AP list as it has no target at this
\nstage (unless another interrupt fires, but that’s another story).<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
KVM: arm64: vgic: Handle race between interrupt affinity change and LPI disabling<\/p>\n
Hyunwoo Kim reports some really bad races should<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-6907","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/6907","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6907"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6907"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6907"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}