Messages in this thread | | | Date | Tue, 21 Apr 2020 04:42:49 +0100 | From | Al Viro <> | Subject | Re: [PATCH] fs/binfmt_elf.c: allocate initialized memory in fill_thread_core_info() |
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On Mon, Apr 20, 2020 at 03:41:40PM -0700, Kees Cook wrote: > On Mon, Apr 20, 2020 at 03:33:52PM -0700, Andrew Morton wrote: > > On Sun, 19 Apr 2020 12:08:48 +0200 glider@google.com wrote: > > > > > KMSAN reported uninitialized data being written to disk when dumping > > > core. As a result, several kilobytes of kmalloc memory may be written to > > > the core file and then read by a non-privileged user. > > Ewww. That's been there for 12 years. Did something change in > regset_size() or regset->get()? Do you know what leaves the hole?
Not lately and I would also like to hear the details; which regset it is? Should be reasonably easy to find - just memset() the damn thing to something recognizable, do whatever triggers that KMSAN report and look at that resulting coredump.
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