[lkml]   [2020]   [Apr]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
SubjectRe: hv_hypercall_pg page permissios
Christoph Hellwig <> writes:

> Hi all,
> The x86 Hyper-V hypercall page (hv_hypercall_pg) is the only allocation
> in the kernel using __vmalloc with exectutable persmissions, and the
> only user of PAGE_KERNEL_RX. Is there any good reason it needs to
> be readable? Otherwise we could use vmalloc_exec and kill off
> PAGE_KERNEL_RX. Note that before 372b1e91343e6 ("drivers: hv: Turn off
> write permission on the hypercall page") it was even mapped writable..

[There is nothing secret in the hypercall page, by reading it you can
figure out if you're running on Intel or AMD (VMCALL/VMMCALL) but it's
likely not the only possible way :-)]

I see no reason for hv_hypercall_pg to remain readable. I just

diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 7581cab74acb..17845db67fe2 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -382,7 +382,7 @@ void __init hyperv_init(void)
guest_id = generate_guest_id(0, LINUX_VERSION_CODE, 0);
wrmsrl(HV_X64_MSR_GUEST_OS_ID, guest_id);

- hv_hypercall_pg = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_RX);
+ hv_hypercall_pg = vmalloc_exec(PAGE_SIZE);
if (hv_hypercall_pg == NULL) {
wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);
goto remove_cpuhp_state;
on a Hyper-V 2016 guest and nothing broke, feel free to go ahead and


 \ /
  Last update: 2020-04-07 09:28    [W:0.093 / U:0.820 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site