In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
fs: preserve ACL_DONT_CACHE state in forget_cached_acl()<\/p>\n
The ACL_DONT_CACHE state is meant to be a constant state for the inode
\nfor filesystems that want to opt out of posix acl caching.<\/p>\n
Commit facd61053cff1 (“fuse: fixes after adapting to new posix acl api”)
\nused this facility to opt out of posix acl caching for fuse inodes with
\nfuse server that does not negotiate FUSE_POSIX_ACL (fc->posix_acl).<\/p>\n
The commit also takes care to gate the forget_all_cached_acls() call in
\nfuse_set_acl() on fc->posix_acl because there is no need for it, but
\nthere are other placed in fuse code which call forget_all_cached_acls()
\nunconditional to fc->posix_acl and those cause the loss of the
\nACL_DONT_CACHE state.<\/p>\n
This is not only a functional bug. Properly timed, a get_acl() from this
\nfuse filesystem can return a stale cached value, as was observed in tests,
\nbecause set_acl() does not invalidate the unintentional acl cache.<\/p>\n
We could fix this in fuse, but it actually makes no sense for the vfs
\nhelper forget_cached_acl() to invalidate the ACL_DONT_CACHE state, so
\nlet it not do that to fix fuse and future users of ACL_DONT_CACHE.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
fs: preserve ACL_DONT_CACHE state in forget_cached_acl()<\/p>\n
The ACL_DONT_CACHE state is meant to be a constant state for the inode
\nfo<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-5355","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/5355","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=5355"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5355"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5355"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}