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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 10:20:20 +0800
commit070dfed4d04ef6c18f07a2d147c1be74c8c84f5b (patch)
parent9cafe6bb9aa2584608b4c7e4d8b9ba13e0ff5da1 (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>
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index fbd8ce6d7ff3..27228fe57eca 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;