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authorRusty Russell <rusty@rustcorp.com.au>2009-04-19 23:14:00 -0600
committerRusty Russell <rusty@rustcorp.com.au>2009-04-19 23:14:01 +0930
commita489f0b555b753f9df8ddc24c7e74f657ef7ee7b (patch)
tree560bd8c56524b658eb0b46e03ef42e262eb5f9b7 /drivers/lguest/x86
parent88df781afb788fa588dbf2e77f205214022a8893 (diff)
downloadop-kernel-dev-a489f0b555b753f9df8ddc24c7e74f657ef7ee7b.zip
op-kernel-dev-a489f0b555b753f9df8ddc24c7e74f657ef7ee7b.tar.gz
lguest: fix guest crash on non-linear addresses in gdt pvops
Fixes guest crash 'lguest: bad read address 0x4800000 len 256' The new per-cpu allocator ends up handing a non-linear address to write_gdt_entry. We do __pa() on it, and hand it to the host, which kills us. I've long wanted to make the hypercall "LOAD_GDT_ENTRY" to match the IDT code, but had no pressing reason until now. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: lguest@ozlabs.org
Diffstat (limited to 'drivers/lguest/x86')
-rw-r--r--drivers/lguest/x86/core.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c
index d6d7ac0..1a83910 100644
--- a/drivers/lguest/x86/core.c
+++ b/drivers/lguest/x86/core.c
@@ -568,8 +568,8 @@ void __exit lguest_arch_host_fini(void)
int lguest_arch_do_hcall(struct lg_cpu *cpu, struct hcall_args *args)
{
switch (args->arg0) {
- case LHCALL_LOAD_GDT:
- load_guest_gdt(cpu, args->arg1, args->arg2);
+ case LHCALL_LOAD_GDT_ENTRY:
+ load_guest_gdt_entry(cpu, args->arg1, args->arg2, args->arg3);
break;
case LHCALL_LOAD_IDT_ENTRY:
load_guest_idt_entry(cpu, args->arg1, args->arg2, args->arg3);
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