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The .brk section has the same properties as .bss: it is an alloc-only
section and should be cleared before being used.
Not doing so is especially a problem for Xen PV guests, as the
hypervisor will validate page tables (check for writable page tables
and hypervisor private bits) before accepting them to be used.
Make sure .brk is initially zero by letting clear_bss() clear the brk
area, too.
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220630071441.28576-3-jgross@suse.com
38fa5479b4