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Date: Thu, 10 Sep 2020 14:48:02 +0100
From: Elena Petrova <lenaptr@...gle.com>
To: kernel-hardening@...ts.openwall.com
Cc: Elena Petrova <lenaptr@...gle.com>, linux-kernel@...r.kernel.org,
Kees Cook <keescook@...omium.org>
Subject: [PATCH] sched.h: drop in_ubsan field when UBSAN is in trap mode
in_ubsan field of task_struct is only used in lib/ubsan.c, which in its
turn is used only `ifneq ($(CONFIG_UBSAN_TRAP),y)`.
Removing unnecessary field from a task_struct will help preserve the
ABI between vanilla and CONFIG_UBSAN_TRAP'ed kernels. In particular,
this will help enabling bounds sanitizer transparently for Android's
GKI.
Signed-off-by: Elena Petrova <lenaptr@...gle.com>
---
include/linux/sched.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index afe01e232935..5c7b8dec236e 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1008,7 +1008,7 @@ struct task_struct {
struct held_lock held_locks[MAX_LOCK_DEPTH];
#endif
-#ifdef CONFIG_UBSAN
+#if defined(CONFIG_UBSAN) && !defined(CONFIG_UBSAN_TRAP)
unsigned int in_ubsan;
#endif
--
2.28.0.526.ge36021eeef-goog
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