From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: linux-kernel@vger.kernel.org, x86@kernel.org, linux-sgx@vger.kernel.org
Cc: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
Jethro Beekman <jethro@fortanix.com>,
akpm@linux-foundation.org, andriy.shevchenko@linux.intel.com,
asapek@google.com, bp@alien8.de, cedric.xing@intel.com,
chenalexchen@google.com, conradparker@google.com,
cyhanish@google.com, dave.hansen@intel.com,
haitao.huang@intel.com, josh@joshtriplett.org,
kai.huang@intel.com, kai.svahn@intel.com, kmoy@google.com,
ludloff@google.com, luto@kernel.org, nhorman@redhat.com,
npmccallum@redhat.com, puiterwijk@redhat.com,
rientjes@google.com, sean.j.christopherson@intel.com,
tglx@linutronix.de, yaozhangx@google.com
Subject: [PATCH v32 14/21] x86/sgx: ptrace() support for the SGX driver
Date: Mon, 1 Jun 2020 10:52:11 +0300 [thread overview]
Message-ID: <20200601075218.65618-15-jarkko.sakkinen@linux.intel.com> (raw)
In-Reply-To: <20200601075218.65618-1-jarkko.sakkinen@linux.intel.com>
Add VMA callbacks for ptrace() that can be used with debug enclaves.
With debug enclaves data can be read and write the memory word at a time
by using ENCLS(EDBGRD) and ENCLS(EDBGWR) leaf instructions.
Acked-by: Jethro Beekman <jethro@fortanix.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
arch/x86/kernel/cpu/sgx/encl.c | 87 ++++++++++++++++++++++++++++++++++
1 file changed, 87 insertions(+)
diff --git a/arch/x86/kernel/cpu/sgx/encl.c b/arch/x86/kernel/cpu/sgx/encl.c
index 325b918ab8d2..459240d0512f 100644
--- a/arch/x86/kernel/cpu/sgx/encl.c
+++ b/arch/x86/kernel/cpu/sgx/encl.c
@@ -334,10 +334,97 @@ static int sgx_vma_mprotect(struct vm_area_struct *vma, unsigned long start,
calc_vm_prot_bits(prot, 0));
}
+static int sgx_edbgrd(struct sgx_encl *encl, struct sgx_encl_page *page,
+ unsigned long addr, void *data)
+{
+ unsigned long offset = addr & ~PAGE_MASK;
+ int ret;
+
+
+ ret = __edbgrd(sgx_get_epc_addr(page->epc_page) + offset, data);
+ if (ret)
+ return -EIO;
+
+ return 0;
+}
+
+static int sgx_edbgwr(struct sgx_encl *encl, struct sgx_encl_page *page,
+ unsigned long addr, void *data)
+{
+ unsigned long offset = addr & ~PAGE_MASK;
+ int ret;
+
+ ret = __edbgwr(sgx_get_epc_addr(page->epc_page) + offset, data);
+ if (ret)
+ return -EIO;
+
+ return 0;
+}
+
+static int sgx_vma_access(struct vm_area_struct *vma, unsigned long addr,
+ void *buf, int len, int write)
+{
+ struct sgx_encl *encl = vma->vm_private_data;
+ struct sgx_encl_page *entry = NULL;
+ char data[sizeof(unsigned long)];
+ unsigned long align;
+ unsigned int flags;
+ int offset;
+ int cnt;
+ int ret = 0;
+ int i;
+
+ /* If process was forked, VMA is still there but vm_private_data is set
+ * to NULL.
+ */
+ if (!encl)
+ return -EFAULT;
+
+ flags = atomic_read(&encl->flags);
+
+ if (!(flags & SGX_ENCL_DEBUG) || !(flags & SGX_ENCL_INITIALIZED) ||
+ (flags & SGX_ENCL_DEAD))
+ return -EFAULT;
+
+ for (i = 0; i < len; i += cnt) {
+ entry = sgx_encl_reserve_page(encl, (addr + i) & PAGE_MASK);
+ if (IS_ERR(entry)) {
+ ret = PTR_ERR(entry);
+ break;
+ }
+
+ align = ALIGN_DOWN(addr + i, sizeof(unsigned long));
+ offset = (addr + i) & (sizeof(unsigned long) - 1);
+ cnt = sizeof(unsigned long) - offset;
+ cnt = min(cnt, len - i);
+
+ ret = sgx_edbgrd(encl, entry, align, data);
+ if (ret)
+ goto out;
+
+ if (write) {
+ memcpy(data + offset, buf + i, cnt);
+ ret = sgx_edbgwr(encl, entry, align, data);
+ if (ret)
+ goto out;
+ } else
+ memcpy(buf + i, data + offset, cnt);
+
+out:
+ mutex_unlock(&encl->lock);
+
+ if (ret)
+ break;
+ }
+
+ return ret < 0 ? ret : i;
+}
+
const struct vm_operations_struct sgx_vm_ops = {
.open = sgx_vma_open,
.fault = sgx_vma_fault,
.may_mprotect = sgx_vma_mprotect,
+ .access = sgx_vma_access,
};
/**
--
2.25.1
next prev parent reply other threads:[~2020-06-01 7:54 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-01 7:51 [PATCH v32 00/21] Intel SGX foundations Jarkko Sakkinen
2020-06-01 7:51 ` [PATCH v32 01/21] x86/cpufeatures: x86/msr: Add Intel SGX hardware bits Jarkko Sakkinen
2020-06-01 7:51 ` [PATCH v32 02/21] x86/cpufeatures: x86/msr: Add Intel SGX Launch Control " Jarkko Sakkinen
2020-06-01 7:52 ` [PATCH v32 03/21] x86/mm: x86/sgx: Signal SIGSEGV with PF_SGX Jarkko Sakkinen
2020-06-01 7:52 ` [PATCH v32 04/21] x86/sgx: Add SGX microarchitectural data structures Jarkko Sakkinen
2020-06-01 7:52 ` [PATCH v32 05/21] x86/sgx: Add wrappers for ENCLS leaf functions Jarkko Sakkinen
2020-06-01 7:52 ` [PATCH v32 06/21] x86/cpu/intel: Detect SGX support Jarkko Sakkinen
2020-06-01 7:52 ` [PATCH v32 07/21] x86/cpu/intel: Add nosgx kernel parameter Jarkko Sakkinen
2020-06-01 7:52 ` [PATCH v32 08/21] x86/sgx: Initialize metadata for Enclave Page Cache (EPC) sections Jarkko Sakkinen
2020-06-01 15:15 ` Randy Dunlap
2020-06-15 20:07 ` Jarkko Sakkinen
2020-06-01 7:52 ` [PATCH v32 09/21] x86/sgx: Add __sgx_alloc_epc_page() and sgx_free_epc_page() Jarkko Sakkinen
2020-06-01 7:52 ` [PATCH v32 10/21] mm: Introduce vm_ops->may_mprotect() Jarkko Sakkinen
2020-06-01 7:52 ` [PATCH v32 11/21] x86/sgx: Linux Enclave Driver Jarkko Sakkinen
2020-06-01 7:52 ` [PATCH v32 12/21] x86/sgx: Add provisioning Jarkko Sakkinen
2020-06-05 20:09 ` Darren Kenny
2020-06-16 19:55 ` Jarkko Sakkinen
2020-06-16 20:03 ` Jarkko Sakkinen
2020-06-01 7:52 ` [PATCH v32 13/21] x86/sgx: Add a page reclaimer Jarkko Sakkinen
2020-06-01 7:52 ` Jarkko Sakkinen [this message]
2020-06-01 7:52 ` [PATCH v32 15/21] x86/vdso: Add support for exception fixup in vDSO functions Jarkko Sakkinen
2020-06-01 7:52 ` [PATCH v32 16/21] x86/fault: Add helper function to sanitize error code Jarkko Sakkinen
2020-06-01 7:52 ` [PATCH v32 17/21] x86/traps: Attempt to fixup exceptions in vDSO before signaling Jarkko Sakkinen
2020-06-01 7:52 ` [PATCH v32 18/21] x86/vdso: Implement a vDSO for Intel SGX enclave call Jarkko Sakkinen
2020-06-01 7:52 ` [PATCH v32 19/21] selftests/x86: Add a selftest for SGX Jarkko Sakkinen
2020-06-03 22:06 ` Sean Christopherson
2020-06-15 20:17 ` Jarkko Sakkinen
2020-06-01 7:52 ` [PATCH v32 20/21] docs: x86/sgx: Document SGX micro architecture and kernel internals Jarkko Sakkinen
2020-06-01 7:52 ` [PATCH v32 21/21] x86/sgx: Update MAINTAINERS Jarkko Sakkinen
2020-06-10 20:59 ` [PATCH v32 00/21] Intel SGX foundations Sean Christopherson
2020-06-16 20:09 ` Jarkko Sakkinen
2020-06-17 0:06 ` Sean Christopherson
2020-06-17 21:53 ` Jarkko Sakkinen
2020-06-15 12:13 ` Jethro Beekman
2020-06-16 20:11 ` Jarkko Sakkinen
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