Messages in this thread Patch in this message | | | From | Rick Edgecombe <> | Subject | [PATCH 03/10] kvmclock: Use free_decrypted_pages() | Date | Tue, 17 Oct 2023 13:24:58 -0700 |
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On TDX it is possible for the untrusted host to cause set_memory_encrypted() or set_memory_decrypted() to fail such that an error is returned and the resulting memory is shared. Callers need to take care to handle these errors to avoid returning decrypted (shared) memory to the page allocator, which could lead to functional or security issues.
Kvmclock could free decrypted/shared pages if set_memory_decrypted() fails. Use the recently added free_decrypted_pages() to avoid this.
Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Wanpeng Li <wanpengli@tencent.com> Cc: Vitaly Kuznetsov <vkuznets@redhat.com> Cc: kvm@vger.kernel.org Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com> --- arch/x86/kernel/kvmclock.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c index fb8f52149be9..587b159c4e53 100644 --- a/arch/x86/kernel/kvmclock.c +++ b/arch/x86/kernel/kvmclock.c @@ -227,7 +227,7 @@ static void __init kvmclock_init_mem(void) r = set_memory_decrypted((unsigned long) hvclock_mem, 1UL << order); if (r) { - __free_pages(p, order); + free_decrypted_pages((unsigned long)hvclock_mem, order); hvclock_mem = NULL; pr_warn("kvmclock: set_memory_decrypted() failed. Disabling\n"); return; -- 2.34.1
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