From: Sean Christopherson <sean.j.christopherson@intel.com>
To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc: Nathaniel McCallum <npmccallum@redhat.com>,
Cedric Xing <cedric.xing@intel.com>,
Jethro Beekman <jethro@fortanix.com>,
Andy Lutomirski <luto@amacapital.net>,
linux-sgx@vger.kernel.org
Subject: [PATCH for_v29 1/8] x86/sgx: vdso: Remove an incorrect statement the enter enclave comment
Date: Wed, 18 Mar 2020 18:11:23 -0700 [thread overview]
Message-ID: <20200319011130.8556-2-sean.j.christopherson@intel.com> (raw)
In-Reply-To: <20200319011130.8556-1-sean.j.christopherson@intel.com>
Remove the statement about the userspace exit handler being required to
clean up the untrusted stack, the vDSO unconditionally restores %rsp to
its value at the time of EEXIT.
Reported-by: Nathaniel McCallum <npmccallum@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
arch/x86/entry/vdso/vsgx_enter_enclave.S | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/arch/x86/entry/vdso/vsgx_enter_enclave.S b/arch/x86/entry/vdso/vsgx_enter_enclave.S
index 94a8e5f99961..22a22e0774d8 100644
--- a/arch/x86/entry/vdso/vsgx_enter_enclave.S
+++ b/arch/x86/entry/vdso/vsgx_enter_enclave.S
@@ -59,10 +59,8 @@
* 0: success, return @ret to the caller
* <0: error, return @ret to the caller
*
- * The userspace exit handler is responsible for unwinding the stack, e.g. to
- * pop @e, u_rsp and @tcs, prior to returning to __vdso_sgx_enter_enclave().
- * The exit handler may also transfer control, e.g. via longjmp() or a C++
- * exception, without returning to __vdso_sgx_enter_enclave().
+ * The exit handler may transfer control, e.g. via longjmp() or C++ exception,
+ * without returning to __vdso_sgx_enter_enclave().
*
* Return:
* 0 on success,
--
2.24.1
next prev parent reply other threads:[~2020-03-19 1:11 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-19 1:11 [PATCH for_v29 0/8] x86/sgx: Make vDSO callable from C Sean Christopherson
2020-03-19 1:11 ` Sean Christopherson [this message]
2020-03-19 20:49 ` [PATCH for_v29 1/8] x86/sgx: vdso: Remove an incorrect statement the enter enclave comment Jarkko Sakkinen
2020-03-19 1:11 ` [PATCH for_v29 2/8] x86/sgx: vdso: Make the %rsp fixup on return from handler relative Sean Christopherson
2020-03-20 2:39 ` Jarkko Sakkinen
2020-03-20 2:42 ` Jarkko Sakkinen
2020-03-19 1:11 ` [PATCH for_v29 3/8] x86/sgx: vdso: Make __vdso_sgx_enter_enclave() callable from C code Sean Christopherson
2020-03-19 20:03 ` Xing, Cedric
2020-03-19 20:11 ` Sean Christopherson
2020-03-20 3:07 ` Jarkko Sakkinen
2020-03-20 23:26 ` Sean Christopherson
2020-03-21 0:57 ` Jarkko Sakkinen
2020-03-19 1:11 ` [PATCH for_v29 4/8] x86/sgx: vdso: Define a typedef for __vdso_sgx_enter_enclave Sean Christopherson
2020-03-19 1:11 ` [PATCH for_v29 5/8] selftests/x86: sgx: Zero out @result before invoking vDSO sub-test Sean Christopherson
2020-03-19 1:11 ` [PATCH for_v29 6/8] selftests/x86: sgx: Pass EENTER to vDSO wrapper instead of hardcoding Sean Christopherson
2020-03-19 1:11 ` [PATCH for_v29 7/8] selftests/x86: sgx: Stop clobbering non-volatile registers Sean Christopherson
2020-03-19 1:11 ` [PATCH for_v29 8/8] selftests/x86: Add selftest to invoke __vsgx_enter_enclave() from C Sean Christopherson
2020-03-20 0:57 ` [PATCH for_v29 0/8] x86/sgx: Make vDSO callable " Jarkko Sakkinen
2020-03-20 23:25 ` Sean Christopherson
2020-03-21 0:55 ` Jarkko Sakkinen
2020-03-21 20:11 ` Sean Christopherson
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