In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
iommu\/tegra241-cmdqv: Publish an LVCMDQ only after it is fully initialized<\/p>\n
tegra241_vintf_init_lvcmdq() stores the freshly allocated vcmdq pointer to
\nthe vintf->lvcmdqs[] array, before tegra241_vcmdq_alloc_smmu_cmdq() builds
\nthe vcmdq->cmdq. The error ISR dereferences that cmdq, so a latched LVCMDQ
\nerror (e.g. one inherited across a kexec) firing in this window would make
\ntegra241_vintf0_handle_error() pass the still-zeroed arm_smmu_cmdq down to
\n__arm_smmu_cmdq_skip_err(), dereferencing NULL queue register pointers.<\/p>\n
Drop the store from tegra241_vintf_init_lvcmdq() and publish the vcmdq at
\nthe end of the allocation instead, with an smp_store_release() that pairs
\nwith an smp_load_acquire() in the ISR, which can see a fully built LVCMDQ
\nor NULL.<\/p>\n
The user-owned LVCMDQ allocation moves accordingly, publishing the vcmdq
\nonce tegra241_vcmdq_hw_init_user() succeeds, using a plain store since a
\nuser VINTF’s lvcmdqs[] has no lockless reader — the error ISR only walks
\nthe VINTF0 array.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
iommu\/tegra241-cmdqv: Publish an LVCMDQ only after it is fully initialized<\/p>\n
tegra241_vintf_init_lvcmdq() stores the freshly allocat<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-25839","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/25839","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=25839"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25839"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25839"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}