diff mbox series

[kcsan,2/3] objtool, kcsan: Add volatile read/write instrumentation to whitelist

Message ID 20221019230405.2502089-2-paulmck@kernel.org
State New
Headers
Series KCSAN updates for v6.2 |

Commit Message

Paul E. McKenney Oct. 19, 2022, 11:04 p.m. UTC 
  From: Marco Elver <elver@google.com>

Adds KCSAN's volatile instrumentation to objtool's uaccess whitelist.

Recent kernel change have shown that this was missing from the uaccess
whitelist (since the first upstreamed version of KCSAN):

  mm/gup.o: warning: objtool: fault_in_readable+0x101: call to __tsan_volatile_write1() with UACCESS enabled

Fixes: 75d75b7a4d54 ("kcsan: Support distinguishing volatile accesses")
Signed-off-by: Marco Elver <elver@google.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
 tools/objtool/check.c | 10 ++++++++++
 1 file changed, 10 insertions(+)
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Patch

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 43ec14c29a60c..a7f1e6c8bb0a7 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -999,6 +999,16 @@  static const char *uaccess_safe_builtin[] = {
 	"__tsan_read_write4",
 	"__tsan_read_write8",
 	"__tsan_read_write16",
+	"__tsan_volatile_read1",
+	"__tsan_volatile_read2",
+	"__tsan_volatile_read4",
+	"__tsan_volatile_read8",
+	"__tsan_volatile_read16",
+	"__tsan_volatile_write1",
+	"__tsan_volatile_write2",
+	"__tsan_volatile_write4",
+	"__tsan_volatile_write8",
+	"__tsan_volatile_write16",
 	"__tsan_atomic8_load",
 	"__tsan_atomic16_load",
 	"__tsan_atomic32_load",