In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
x86\/amd_node: Fix potential NULL pointer dereference<\/p>\n
amd_smn_read\/write() are exported functions around __amd_smn_rw(), so
\nthey are always available even if amd_smn_init() fails. In that case,
\n‘amd_roots’ is NULL and __amd_smn_rw() will access uninitialized memory.<\/p>\n
Then, commit:<\/p>\n
83518453074d (“x86\/amd_node: Add SMN offsets to exclusive region access”)<\/p>\n
added the ‘smn_exclusive’ flag, which indicated the calls to
\npci_request_config_region_exclusive() succeeded, to prevent
\nconcurrent userspace access.<\/p>\n
Commit:<\/p>\n
0a4b61d9c2e4 (“x86\/amd_node: Fix AMD root device caching”)<\/p>\n
re-ordered initialization so pci_request_config_region_exclusive() is
\ncalled earlier and a failure exits amd_smn_init() before allocating
\n‘amd_roots’. The setting of ‘smn_exclusive’ moved to the end of
\namd_smn_init(), after ‘amd_roots’ is allocated. It became redundant
\nand can be removed.<\/p>\n
Replace ‘smn_exclusive’ with directly checking ‘amd_roots’, to fix a
\npotential NULL pointer dereference and to simplify the logic.<\/p>\n
[ bp: Reorg commit message, touchup comment. ]
\n [ mingo: Rebase & further touchups. ]<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
x86\/amd_node: Fix potential NULL pointer dereference<\/p>\n
amd_smn_read\/write() are exported functions around __amd_smn_rw(), so
\nthey ar<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-29103","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/29103","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=29103"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=29103"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=29103"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}