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Change History

In the Linux kernel, the following vulnerability has been resolved:

cachefiles: defer exposing anon_fd until after copy_to_user() succeeds

After installing the anonymous fd, we can now see it in userland and close
it. However, at this point we may not have gotten the reference count of
the cache, but we will put it during colse fd, so this may cause a cache
UAF.

So grab the cache reference count before fd_install(). In addition, by
kernel convention, fd is taken over by the user land after fd

kernel.org https://git.kernel.org/stable/c/4b4391e77a6bf24cba2ef1590e113d9b73b11039 [No types assigned]

kernel.org https://git.kernel.org/stable/c/b9f58cdae6a364a3270fd6b6a46e0fd4f7f8ce32 [No types assigned]

kernel.org https://git.kernel.org/stable/c/d2d3eb377a5d081bf2bed177d354a4f59b74da88 [No types assigned]

kernel.org https://git.kernel.org/stable/c/eac51d9daacd61dcc93333ff6a890cf3efc8c1c0 [No types assigned]