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| author | Sean Christopherson <sean.j.christopherson@intel.com> | 2020-02-19 02:29:50 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-03-16 19:57:53 +0300 |
| commit | 06add254c7f3b7f6fdfe04eb028aaabe5b27a734 (patch) | |
| tree | f5ef8f264e875f296c534f56ca7793f8a1abfbe3 /arch/x86/kvm/x86.c | |
| parent | 2f728d66e8a7d89d7cb141bf0acb30c61ae7ded5 (diff) | |
| download | linux-06add254c7f3b7f6fdfe04eb028aaabe5b27a734.tar.xz | |
KVM: x86: Shrink the usercopy region of the emulation context
Shuffle a few operand structs to the end of struct x86_emulate_ctxt and
update the cache creation to whitelist only the region of the emulation
context that is expected to be copied to/from user memory, e.g. the
instruction operands, registers, and fetch/io/mem caches.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index f55899055467..a69f7bf020d9 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -235,13 +235,13 @@ static struct kmem_cache *x86_emulator_cache; static struct kmem_cache *kvm_alloc_emulator_cache(void) { - return kmem_cache_create_usercopy("x86_emulator", - sizeof(struct x86_emulate_ctxt), + unsigned int useroffset = offsetof(struct x86_emulate_ctxt, src); + unsigned int size = sizeof(struct x86_emulate_ctxt); + + return kmem_cache_create_usercopy("x86_emulator", size, __alignof__(struct x86_emulate_ctxt), - SLAB_ACCOUNT, - 0, - sizeof(struct x86_emulate_ctxt), - NULL); + SLAB_ACCOUNT, useroffset, + size - useroffset, NULL); } static int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt); |