Messages in this thread | | | Date | Thu, 7 May 2020 18:56:52 +0200 | From | Sebastian Andrzej Siewior <> | Subject | Re: [PATCH] x86/fpu/xstate: Clear uninitialized xstate areas in core dump |
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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
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