linux-kernel - [PATCH v4 tip/core/rcu 10/15] objtool, kcsan: Add explicit check functions to uaccess whitelist

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Date:   Wed, 15 Apr 2020 11:34:06 -0700
From:   paulmck@...nel.org
To:     linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
        kernel-team@...com, mingo@...nel.org
Cc:     elver@...gle.com, andreyknvl@...gle.com, glider@...gle.com,
        dvyukov@...gle.com, cai@....pw, boqun.feng@...il.com,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH v4 tip/core/rcu 10/15] objtool, kcsan: Add explicit check functions to uaccess whitelist

From: Marco Elver <elver@...gle.com>

Add explicitly invoked KCSAN check functions to objtool's uaccess
whitelist. This is needed in order to permit calling into
kcsan_check_scoped_accesses() from the fast-path, which in turn calls
__kcsan_check_access().  __kcsan_check_access() is the generic variant
of the already whitelisted specializations __tsan_{read,write}N.

Signed-off-by: Marco Elver <elver@...gle.com>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 tools/objtool/check.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index b6da413..b6a573d 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -468,8 +468,10 @@ static const char *uaccess_safe_builtin[] = {
 	"__asan_report_store8_noabort",
 	"__asan_report_store16_noabort",
 	/* KCSAN */
+	"__kcsan_check_access",
 	"kcsan_found_watchpoint",
 	"kcsan_setup_watchpoint",
+	"kcsan_check_scoped_accesses",
 	/* KCSAN/TSAN */
 	"__tsan_func_entry",
 	"__tsan_func_exit",
-- 
2.9.5