In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
swiotlb: Preserve allocation virtual address for dynamic pools<\/p>\n
swiotlb_alloc_tlb() can allocate from the DMA atomic pool when a decrypted
\npool is needed from atomic context. With CONFIG_DMA_DIRECT_REMAP, the
\natomic pool is backed by remapped virtual addresses, which are not the same
\nas the direct-map addresses returned by phys_to_virt().<\/p>\n
swiotlb_init_io_tlb_pool() currently reconstructs the pool virtual address
\nfrom the physical start address. For atomic-pool backed allocations this
\nstores the wrong address in pool->vaddr. Later, swiotlb_free_tlb() passes
\nthat address to dma_free_from_pool(), which will fail to recognize the
\nchunk<\/p>\n
Pass the virtual address returned by the allocation path into
\nswiotlb_init_io_tlb_pool(), and store that address in pool->vaddr. This
\nkeeps the pool free path using the same virtual address as the allocator.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
swiotlb: Preserve allocation virtual address for dynamic pools<\/p>\n
swiotlb_alloc_tlb() can allocate from the DMA atomic pool when a de<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-25796","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/25796","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=25796"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25796"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25796"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}