On 2020-05-07 09:49:04 [-0700], Yu-cheng Yu wrote: > In a core dump, copy_xstate_to_kernel() copies only enabled user xfeatures > to a kernel buffer without touching areas for disabled xfeatures. However, > those uninitialized areas may contain random data, which is then written to > the core dump file and can be read by a non-privileged user. > > Fix it by clearing uninitialized areas. Is the problem that copy_xstate_to_kernel() gets `kbuf' passed which isn't zeroed? If so, would it work clean that upfront? Sebastian
