From b667d9f62f17aa94c247a7774a09a624813e2e7e Mon Sep 17 00:00:00 2001 From: Roger Pau Monne Date: Thu, 11 Jan 2018 11:41:20 +0000 Subject: [PATCH] xen/pvshim: set max_pages to the value of tot_pages MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit So that the guest is not able to deplete the memory pool of the shim itself by trying to balloon up. Signed-off-by: Roger Pau Monné Acked-by: Jan Beulich --- xen/arch/x86/pv/shim.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/xen/arch/x86/pv/shim.c b/xen/arch/x86/pv/shim.c index 6dc1ee45d7..e3e101a5b1 100644 --- a/xen/arch/x86/pv/shim.c +++ b/xen/arch/x86/pv/shim.c @@ -204,6 +204,12 @@ void __init pv_shim_setup_dom(struct domain *d, l4_pgentry_t *l4start, (hypercall_fn_t *)pv_shim_grant_table_op, (hypercall_fn_t *)pv_shim_grant_table_op); guest = d; + + /* + * Set the max pages to the current number of pages to prevent the + * guest from depleting the shim memory pool. + */ + d->max_pages = d->tot_pages; } static void write_start_info(struct domain *d) -- 2.30.2