From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: linux-kernel@vger.kernel.org, x86@kernel.org, linux-sgx@vger.kernel.org
Cc: akpm@linux-foundation.org, dave.hansen@intel.com,
sean.j.christopherson@intel.com, nhorman@redhat.com,
npmccallum@redhat.com, haitao.huang@intel.com,
andriy.shevchenko@linux.intel.com, tglx@linutronix.de,
kai.svahn@intel.com, bp@alien8.de, josh@joshtriplett.org,
luto@kernel.org, kai.huang@intel.com, rientjes@google.com,
cedric.xing@intel.com, puiterwijk@redhat.com,
Jethro Beekman <jethro@fortanix.com>,
Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Subject: [PATCH v30 15/20] x86/fault: Add helper function to sanitize error code
Date: Fri, 15 May 2020 03:44:05 +0300 [thread overview]
Message-ID: <20200515004410.723949-16-jarkko.sakkinen@linux.intel.com> (raw)
In-Reply-To: <20200515004410.723949-1-jarkko.sakkinen@linux.intel.com>
From: Sean Christopherson <sean.j.christopherson@intel.com>
Add helper function to sanitize error code to prepare for vDSO exception
fixup, which will expose the error code to userspace and runs before
set_signal_archinfo(), i.e. suppresses the signal when fixup is successful.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Acked-by: Jethro Beekman <jethro@fortanix.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
arch/x86/mm/fault.c | 24 +++++++++++++++++-------
1 file changed, 17 insertions(+), 7 deletions(-)
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 16c53c874bb9..23666e34abbc 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -704,6 +704,18 @@ pgtable_bad(struct pt_regs *regs, unsigned long error_code,
oops_end(flags, regs, sig);
}
+static void sanitize_error_code(unsigned long address,
+ unsigned long *error_code)
+{
+ /*
+ * To avoid leaking information about the kernel page
+ * table layout, pretend that user-mode accesses to
+ * kernel addresses are always protection faults.
+ */
+ if (address >= TASK_SIZE_MAX)
+ *error_code |= X86_PF_PROT;
+}
+
static void set_signal_archinfo(unsigned long address,
unsigned long error_code)
{
@@ -760,6 +772,8 @@ no_context(struct pt_regs *regs, unsigned long error_code,
* faulting through the emulate_vsyscall() logic.
*/
if (current->thread.sig_on_uaccess_err && signal) {
+ sanitize_error_code(address, &error_code);
+
set_signal_archinfo(address, error_code);
/* XXX: hwpoison faults will set the wrong code. */
@@ -908,13 +922,7 @@ __bad_area_nosemaphore(struct pt_regs *regs, unsigned long error_code,
if (is_errata100(regs, address))
return;
- /*
- * To avoid leaking information about the kernel page table
- * layout, pretend that user-mode accesses to kernel addresses
- * are always protection faults.
- */
- if (address >= TASK_SIZE_MAX)
- error_code |= X86_PF_PROT;
+ sanitize_error_code(address, &error_code);
if (likely(show_unhandled_signals))
show_signal_msg(regs, error_code, address, tsk);
@@ -1031,6 +1039,8 @@ do_sigbus(struct pt_regs *regs, unsigned long error_code, unsigned long address,
if (is_prefetch(regs, error_code, address))
return;
+ sanitize_error_code(address, &error_code);
+
set_signal_archinfo(address, error_code);
#ifdef CONFIG_MEMORY_FAILURE
--
2.25.1
next prev parent reply other threads:[~2020-05-15 0:46 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-15 0:43 [PATCH v30 00/20] Intel SGX foundations Jarkko Sakkinen
2020-05-15 0:43 ` [PATCH v30 01/20] x86/cpufeatures: x86/msr: Add Intel SGX hardware bits Jarkko Sakkinen
2020-05-20 12:16 ` Borislav Petkov
2020-05-20 14:00 ` Jarkko Sakkinen
2020-05-15 0:43 ` [PATCH v30 02/20] x86/cpufeatures: x86/msr: Intel SGX Launch Control " Jarkko Sakkinen
2020-05-20 12:23 ` Borislav Petkov
2020-05-20 14:04 ` Jarkko Sakkinen
2020-05-15 0:43 ` [PATCH v30 03/20] x86/mm: x86/sgx: Signal SIGSEGV with PF_SGX Jarkko Sakkinen
2020-05-15 0:43 ` [PATCH v30 04/20] x86/sgx: Add SGX microarchitectural data structures Jarkko Sakkinen
2020-05-20 18:47 ` Borislav Petkov
2020-05-20 21:04 ` Sean Christopherson
2020-05-22 15:54 ` Jarkko Sakkinen
2020-05-22 16:13 ` Sean Christopherson
2020-05-22 19:50 ` Jarkko Sakkinen
2020-05-25 8:20 ` Borislav Petkov
2020-05-27 19:43 ` Jarkko Sakkinen
2020-05-15 0:43 ` [PATCH v30 05/20] x86/sgx: Add wrappers for ENCLS leaf functions Jarkko Sakkinen
2020-05-15 0:43 ` [PATCH v30 06/20] x86/cpu/intel: Detect SGX support Jarkko Sakkinen
2020-05-15 0:43 ` [PATCH v30 07/20] x86/sgx: Enumerate and track EPC sections Jarkko Sakkinen
2020-05-25 9:23 ` Borislav Petkov
2020-05-27 3:56 ` Sean Christopherson
2020-05-27 20:35 ` Borislav Petkov
2020-05-28 7:36 ` Jarkko Sakkinen
2020-05-28 5:25 ` Jarkko Sakkinen
2020-05-28 5:35 ` Jarkko Sakkinen
2020-05-28 6:14 ` Jarkko Sakkinen
2020-05-28 6:16 ` Jarkko Sakkinen
2020-05-28 5:13 ` Jarkko Sakkinen
2020-05-15 0:43 ` [PATCH v30 08/20] x86/sgx: Add functions to allocate and free EPC pages Jarkko Sakkinen
2020-05-26 12:52 ` Borislav Petkov
2020-05-27 4:21 ` Sean Christopherson
2020-05-27 20:46 ` Borislav Petkov
2020-05-28 0:52 ` Sean Christopherson
2020-05-28 6:51 ` Jarkko Sakkinen
2020-05-28 1:23 ` Jarkko Sakkinen
2020-05-28 1:36 ` Sean Christopherson
2020-05-28 6:52 ` Jarkko Sakkinen
2020-05-28 17:16 ` Borislav Petkov
2020-05-28 17:19 ` Sean Christopherson
2020-05-28 17:27 ` Borislav Petkov
2020-05-28 17:34 ` Sean Christopherson
2020-05-28 19:07 ` Jarkko Sakkinen
2020-05-28 19:59 ` Sean Christopherson
2020-05-29 3:28 ` Jarkko Sakkinen
2020-05-29 3:37 ` Sean Christopherson
2020-05-29 5:07 ` Jarkko Sakkinen
2020-05-29 8:12 ` Jarkko Sakkinen
2020-05-29 8:13 ` Jarkko Sakkinen
2020-05-29 3:38 ` Jarkko Sakkinen
2020-05-15 0:43 ` [PATCH v30 09/20] mm: Introduce vm_ops->may_mprotect() Jarkko Sakkinen
2020-05-29 12:10 ` Borislav Petkov
2020-05-29 18:18 ` Jarkko Sakkinen
2020-05-29 18:28 ` Dave Hansen
2020-05-31 23:12 ` Jarkko Sakkinen
2020-05-15 0:44 ` [PATCH v30 10/20] x86/sgx: Linux Enclave Driver Jarkko Sakkinen
2020-05-21 19:12 ` Sean Christopherson
2020-05-22 19:26 ` Jarkko Sakkinen
2020-05-22 19:39 ` Jarkko Sakkinen
2020-05-22 3:33 ` Sean Christopherson
2020-05-15 0:44 ` [PATCH v30 11/20] x86/sgx: Add provisioning Jarkko Sakkinen
2020-05-15 0:44 ` [PATCH v30 12/20] x86/sgx: Add a page reclaimer Jarkko Sakkinen
2020-05-22 6:58 ` Sean Christopherson
2020-05-22 19:57 ` Jarkko Sakkinen
2020-05-22 21:52 ` Sean Christopherson
2020-05-22 7:15 ` Sean Christopherson
2020-05-22 19:47 ` Jarkko Sakkinen
2020-05-15 0:44 ` [PATCH v30 13/20] x86/sgx: ptrace() support for the SGX driver Jarkko Sakkinen
2020-05-15 0:44 ` [PATCH v30 14/20] x86/vdso: Add support for exception fixup in vDSO functions Jarkko Sakkinen
2020-05-15 0:44 ` Jarkko Sakkinen [this message]
2020-05-15 0:44 ` [PATCH v30 16/20] x86/traps: Attempt to fixup exceptions in vDSO before signaling Jarkko Sakkinen
2020-05-15 0:44 ` [PATCH v30 17/20] x86/vdso: Implement a vDSO for Intel SGX enclave call Jarkko Sakkinen
2020-05-15 0:44 ` [PATCH v30 18/20] selftests/x86: Add a selftest for SGX Jarkko Sakkinen
2020-05-15 0:44 ` [PATCH v30 19/20] docs: x86/sgx: Document SGX micro architecture and kernel internals Jarkko Sakkinen
2020-05-15 0:44 ` [PATCH v30 20/20] x86/sgx: Update MAINTAINERS Jarkko Sakkinen
2020-05-16 8:57 ` [PATCH] x86/cpu/intel: Add nosgx kernel parameter Jarkko Sakkinen
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