26 Jan
2021
26 Jan
'21
11:10 p.m.
On Tue, Jan 26, 2021, Tom Lendacky wrote:
On 1/26/21 12:54 PM, Peter Gonda wrote:
sev_pin_memory assumes that callers hold the kvm->lock. This was true for all callers except svm_register_enc_region since it does not originate from svm_mem_enc_op. Also added lockdep annotation to help prevent future regressions.
I'm not exactly sure what the problem is that your fixing? What is the symptom that you're seeing?
svm_register_enc_region() calls sev_pin_memory() without holding kvm->lock. If userspace does multiple KVM_MEMORY_ENCRYPT_REG_REGION in parallel, it could circumvent the rlimit(RLIMIT_MEMLOCK) check.