In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
drm\/vmwgfx: validate external BO copy bounds for both stride paths<\/p>\n
vmw_external_bo_copy() trusts caller-supplied offsets, strides, and
\nheights and operates on imported dma-buf vmaps:<\/p>\n
– The equal-stride memcpy() bound was clamped after subtracting the
\n offsets from dst_size and src_size; an offset larger than the BO
\n size wraps the unsigned subtraction to a huge value and the
\n resulting memcpy() runs off the end of the vmap. dst_stride *
\n height is also a u32 multiplication that can overflow.
\n – The non-equal-stride row-by-row path had no bound at all. The
\n loop touches bytes through offset + (height – 1) * stride +
\n width_in_bytes, with only a WARN_ON(dst_stride < width_in_bytes),
\n and could likewise step past the end of either mapping.<\/p>\n
The offsets and strides are derived from STDU\/SOU plane state, so a
\nconfigured CRTC submitting a crafted atomic commit on an imported
\nframebuffer can reach this path.<\/p>\n
Validate the exact row-copy endpoint against each BO's size up front
\nusing check_mul_overflow() and check_add_overflow(). Use the bulk
\nmemcpy() path only when width_in_bytes covers the whole stride;
\notherwise copy one row at a time so partial-row updates near the bottom
\nof a framebuffer remain valid. Also reject zero strides and stride <
\nwidth_in_bytes, both of which the row-by-row path cannot represent
\nsafely.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
drm\/vmwgfx: validate external BO copy bounds for both stride paths<\/p>\n
vmw_external_bo_copy() trusts caller-supplied offsets, strides,<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-12348","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/12348","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=12348"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12348"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12348"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}