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authorK. Y. Srinivasan <kys@microsoft.com>2017-02-08 18:30:56 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-03-15 10:02:52 +0800
commit182ff0ebbdab926578728784299cc9d9c195d515 (patch)
treef944c534d5705f4b31f0193d695d2356e2625557
parent63e873679ba99649bf22cc7b964315591cedf4c5 (diff)
drivers: hv: Turn off write permission on the hypercall page
commit 372b1e91343e657a7cc5e2e2bcecd5140ac28119 upstream. The hypercall page only needs to be executable but currently it is setup to be writable as well. Fix the issue. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Acked-by: Kees Cook <keescook@chromium.org> Reported-by: Stephen Hemminger <stephen@networkplumber.org> Tested-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/hv/hv.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index 6e49a4dd99c0..e0a8216ecf2b 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -220,7 +220,7 @@ int hv_init(void)
/* See if the hypercall page is already set */
rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
- virtaddr = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_EXEC);
+ virtaddr = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_RX);
if (!virtaddr)
goto cleanup;