linux-kernel - [PATCH v2 4/5] iov_iter: Use generic instrumented.h

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Message-Id: <20200121160512.70887-4-elver@google.com>
Date:   Tue, 21 Jan 2020 17:05:11 +0100
From:   Marco Elver <elver@...gle.com>
To:     elver@...gle.com
Cc:     paulmck@...nel.org, andreyknvl@...gle.com, glider@...gle.com,
        dvyukov@...gle.com, kasan-dev@...glegroups.com,
        linux-kernel@...r.kernel.org, mark.rutland@....com,
        will@...nel.org, peterz@...radead.org, boqun.feng@...il.com,
        arnd@...db.de, viro@...iv.linux.org.uk, dja@...ens.net,
        christophe.leroy@....fr, mpe@...erman.id.au, mhiramat@...nel.org,
        rostedt@...dmis.org, mingo@...nel.org,
        christian.brauner@...ntu.com, daniel@...earbox.net,
        keescook@...omium.org, cyphar@...har.com,
        linux-arch@...r.kernel.org
Subject: [PATCH v2 4/5] iov_iter: Use generic instrumented.h

This replaces the kasan instrumentation with generic instrumentation,
implicitly adding KCSAN instrumentation support.

For KASAN no functional change is intended.

Suggested-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Marco Elver <elver@...gle.com>
---
v2:
* Use updated instrumented.h, removing post-hooks for user-copies.
---
 lib/iov_iter.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index fb29c02c6a3c..614b6999d2da 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -8,6 +8,7 @@
 #include <linux/splice.h>
 #include <net/checksum.h>
 #include <linux/scatterlist.h>
+#include <linux/instrumented.h>
 
 #define PIPE_PARANOIA /* for now */
 
@@ -138,7 +139,7 @@
 static int copyout(void __user *to, const void *from, size_t n)
 {
 	if (access_ok(to, n)) {
-		kasan_check_read(from, n);
+		instrument_copy_to_user(to, from, n);
 		n = raw_copy_to_user(to, from, n);
 	}
 	return n;
@@ -147,7 +148,7 @@ static int copyout(void __user *to, const void *from, size_t n)
 static int copyin(void *to, const void __user *from, size_t n)
 {
 	if (access_ok(from, n)) {
-		kasan_check_write(to, n);
+		instrument_copy_from_user(to, from, n);
 		n = raw_copy_from_user(to, from, n);
 	}
 	return n;
@@ -639,7 +640,7 @@ EXPORT_SYMBOL(_copy_to_iter);
 static int copyout_mcsafe(void __user *to, const void *from, size_t n)
 {
 	if (access_ok(to, n)) {
-		kasan_check_read(from, n);
+		instrument_copy_to_user(to, from, n);
 		n = copy_to_user_mcsafe((__force void *) to, from, n);
 	}
 	return n;
-- 
2.25.0.341.g760bfbb309-goog