linux-kernel - [tip: locking/kcsan] objtool, kcsan: Add explicit check functions to uaccess whitelist

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Date:   Fri, 08 May 2020 13:46:34 -0000
From:   "tip-bot2 for Marco Elver" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Marco Elver <elver@...gle.com>,
        "Paul E. McKenney" <paulmck@...nel.org>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: locking/kcsan] objtool, kcsan: Add explicit check functions to
 uaccess whitelist

The following commit has been merged into the locking/kcsan branch of tip:

Commit-ID:     9967683ce5d4ce21829bbc807e006ee33cc68725
Gitweb:        https://git.kernel.org/tip/9967683ce5d4ce21829bbc807e006ee33cc68725
Author:        Marco Elver <elver@...gle.com>
AuthorDate:    Wed, 25 Mar 2020 17:41:57 +01:00
Committer:     Paul E. McKenney <paulmck@...nel.org>
CommitterDate: Mon, 13 Apr 2020 17:18:12 -07:00

objtool, kcsan: Add explicit check functions to uaccess whitelist

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",