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From: Sean Christopherson <sean.j.christopherson@intel.com>
To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc: linux-sgx@vger.kernel.org
Subject: [PATCH for_v23 v2 1/9] x86/sgx: WARN once if an enclave is released with unfreed EPC pages
Date: Thu, 10 Oct 2019 16:21:00 -0700
Message-ID: <20191010232108.27075-2-sean.j.christopherson@intel.com> (raw)
In-Reply-To: <20191010232108.27075-1-sean.j.christopherson@intel.com>

Add a WARN to detect EPC page leaks when releasing an enclave.  The
release flow uses the common sgx_encl_destroy() helper, which is allowed
to be called while the reclaimer holds references to the enclave's EPC
pages and so can't WARN in the scenario where the SECS is leaked because
it has active child pages.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kernel/cpu/sgx/encl.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/cpu/sgx/encl.c b/arch/x86/kernel/cpu/sgx/encl.c
index c13c3ba3430a..b4d7b2f9609f 100644
--- a/arch/x86/kernel/cpu/sgx/encl.c
+++ b/arch/x86/kernel/cpu/sgx/encl.c
@@ -511,6 +511,7 @@ void sgx_encl_release(struct kref *ref)
 		fput(encl->backing);
 
 	WARN_ONCE(!list_empty(&encl->mm_list), "mm_list non-empty");
+	WARN_ON_ONCE(encl->secs_child_cnt || encl->secs.epc_page);
 
 	kfree(encl);
 }
-- 
2.22.0


  reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-10 23:20 [PATCH for_v23 v2 0/9] x86/sgx: Misc page related fixes Sean Christopherson
2019-10-10 23:21 ` Sean Christopherson [this message]
2019-10-10 23:21 ` [PATCH for_v23 v2 2/9] x86/sgx: Do not EWB SECS if the enclave is dead Sean Christopherson
2019-10-10 23:21 ` [PATCH for_v23 v2 3/9] x86/sgx: Fix a memory leak in sgx_encl_destroy() Sean Christopherson
2019-10-10 23:21 ` [PATCH for_v23 v2 4/9] x86/sgx: WARN on any non-zero return from __eremove() Sean Christopherson
2019-10-10 23:21 ` [PATCH for_v23 v2 5/9] x86/sgx: WARN only once if EREMOVE fails Sean Christopherson
2019-10-10 23:21 ` [PATCH for_v23 v2 6/9] x86/sgx: Split second half of sgx_free_page() to a separate helper Sean Christopherson
2019-10-10 23:21 ` [PATCH for_v23 v2 7/9] x86/sgx: Use the post-reclaim variant of __sgx_free_page() Sean Christopherson
2019-10-10 23:21 ` [PATCH for_v23 v2 8/9] x86/sgx: Don't update free page count if EPC section allocation fails Sean Christopherson
2019-10-10 23:21 ` [PATCH for_v23 v2 9/9] x86/sgx: Reinstate per EPC section free page counts Sean Christopherson

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