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Message-Id: <20211209221545.2333249-2-pcc@google.com>
Date: Thu, 9 Dec 2021 14:15:38 -0800
From: Peter Collingbourne <pcc@...gle.com>
To: Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>, Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Juri Lelli <juri.lelli@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>,
Dietmar Eggemann <dietmar.eggemann@....com>,
Steven Rostedt <rostedt@...dmis.org>,
Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
Daniel Bristot de Oliveira <bristot@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Andy Lutomirski <luto@...nel.org>,
Kees Cook <keescook@...omium.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Masahiro Yamada <masahiroy@...nel.org>,
Sami Tolvanen <samitolvanen@...gle.com>,
YiFei Zhu <yifeifz2@...inois.edu>,
Mark Rutland <mark.rutland@....com>,
Frederic Weisbecker <frederic@...nel.org>,
Viresh Kumar <viresh.kumar@...aro.org>,
Andrey Konovalov <andreyknvl@...il.com>,
Peter Collingbourne <pcc@...gle.com>,
Gabriel Krisman Bertazi <krisman@...labora.com>,
Chris Hyser <chris.hyser@...cle.com>,
Daniel Vetter <daniel.vetter@...ll.ch>,
Chris Wilson <chris@...is-wilson.co.uk>,
Arnd Bergmann <arnd@...db.de>,
Dmitry Vyukov <dvyukov@...gle.com>,
Christian Brauner <christian.brauner@...ntu.com>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Alexey Gladkov <legion@...nel.org>,
Ran Xiaokai <ran.xiaokai@....com.cn>,
David Hildenbrand <david@...hat.com>,
Xiaofeng Cao <caoxiaofeng@...ong.com>,
Cyrill Gorcunov <gorcunov@...il.com>,
Thomas Cedeno <thomascedeno@...gle.com>,
Marco Elver <elver@...gle.com>,
Alexander Potapenko <glider@...gle.com>
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
Evgenii Stepanov <eugenis@...gle.com>
Subject: [PATCH v4 1/7] include: split out uaccess instrumentation into a
separate header
In an upcoming change we are going to add uaccess instrumentation
that uses inline access to struct task_struct from the
instrumentation routines. Because instrumentation.h is included
from many places including (recursively) from sched.h this would
otherwise lead to a circular dependency. Break the dependency by
moving uaccess instrumentation routines into a separate header,
instrumentation-uaccess.h.
Link: https://linux-review.googlesource.com/id/I625728db0c8db374e13e4ebc54985ac5c79ace7d
Signed-off-by: Peter Collingbourne <pcc@...gle.com>
Acked-by: Dmitry Vyukov <dvyukov@...gle.com>
---
include/linux/instrumented-uaccess.h | 49 ++++++++++++++++++++++++++++
include/linux/instrumented.h | 34 -------------------
include/linux/uaccess.h | 2 +-
lib/iov_iter.c | 2 +-
lib/usercopy.c | 2 +-
5 files changed, 52 insertions(+), 37 deletions(-)
create mode 100644 include/linux/instrumented-uaccess.h
diff --git a/include/linux/instrumented-uaccess.h b/include/linux/instrumented-uaccess.h
new file mode 100644
index 000000000000..ece549088e50
--- /dev/null
+++ b/include/linux/instrumented-uaccess.h
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+/*
+ * This header provides generic wrappers for memory access instrumentation for
+ * uaccess routines that the compiler cannot emit for: KASAN, KCSAN.
+ */
+#ifndef _LINUX_INSTRUMENTED_UACCESS_H
+#define _LINUX_INSTRUMENTED_UACCESS_H
+
+#include <linux/compiler.h>
+#include <linux/kasan-checks.h>
+#include <linux/kcsan-checks.h>
+#include <linux/types.h>
+
+/**
+ * instrument_copy_to_user - instrument reads of copy_to_user
+ *
+ * Instrument reads from kernel memory, that are due to copy_to_user (and
+ * variants). The instrumentation must be inserted before the accesses.
+ *
+ * @to destination address
+ * @from source address
+ * @n number of bytes to copy
+ */
+static __always_inline void
+instrument_copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+ kasan_check_read(from, n);
+ kcsan_check_read(from, n);
+}
+
+/**
+ * instrument_copy_from_user - instrument writes of copy_from_user
+ *
+ * Instrument writes to kernel memory, that are due to copy_from_user (and
+ * variants). The instrumentation should be inserted before the accesses.
+ *
+ * @to destination address
+ * @from source address
+ * @n number of bytes to copy
+ */
+static __always_inline void
+instrument_copy_from_user(const void *to, const void __user *from, unsigned long n)
+{
+ kasan_check_write(to, n);
+ kcsan_check_write(to, n);
+}
+
+#endif /* _LINUX_INSTRUMENTED_UACCESS_H */
diff --git a/include/linux/instrumented.h b/include/linux/instrumented.h
index 42faebbaa202..b68f415510c7 100644
--- a/include/linux/instrumented.h
+++ b/include/linux/instrumented.h
@@ -102,38 +102,4 @@ static __always_inline void instrument_atomic_read_write(const volatile void *v,
kcsan_check_atomic_read_write(v, size);
}
-/**
- * instrument_copy_to_user - instrument reads of copy_to_user
- *
- * Instrument reads from kernel memory, that are due to copy_to_user (and
- * variants). The instrumentation must be inserted before the accesses.
- *
- * @to destination address
- * @from source address
- * @n number of bytes to copy
- */
-static __always_inline void
-instrument_copy_to_user(void __user *to, const void *from, unsigned long n)
-{
- kasan_check_read(from, n);
- kcsan_check_read(from, n);
-}
-
-/**
- * instrument_copy_from_user - instrument writes of copy_from_user
- *
- * Instrument writes to kernel memory, that are due to copy_from_user (and
- * variants). The instrumentation should be inserted before the accesses.
- *
- * @to destination address
- * @from source address
- * @n number of bytes to copy
- */
-static __always_inline void
-instrument_copy_from_user(const void *to, const void __user *from, unsigned long n)
-{
- kasan_check_write(to, n);
- kcsan_check_write(to, n);
-}
-
#endif /* _LINUX_INSTRUMENTED_H */
diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h
index ac0394087f7d..c0c467e39657 100644
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -3,7 +3,7 @@
#define __LINUX_UACCESS_H__
#include <linux/fault-inject-usercopy.h>
-#include <linux/instrumented.h>
+#include <linux/instrumented-uaccess.h>
#include <linux/minmax.h>
#include <linux/sched.h>
#include <linux/thread_info.h>
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 66a740e6e153..3f9dc6df7102 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -12,7 +12,7 @@
#include <linux/compat.h>
#include <net/checksum.h>
#include <linux/scatterlist.h>
-#include <linux/instrumented.h>
+#include <linux/instrumented-uaccess.h>
#define PIPE_PARANOIA /* for now */
diff --git a/lib/usercopy.c b/lib/usercopy.c
index 7413dd300516..1cd188e62d06 100644
--- a/lib/usercopy.c
+++ b/lib/usercopy.c
@@ -1,7 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/bitops.h>
#include <linux/fault-inject-usercopy.h>
-#include <linux/instrumented.h>
+#include <linux/instrumented-uaccess.h>
#include <linux/uaccess.h>
/* out-of-line parts */
--
2.34.1.173.g76aa8bc2d0-goog
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