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Date: Thu, 10 Sep 2020 14:48:02 +0100
From: Elena Petrova <>
Cc: Elena Petrova <>,, 
	Kees Cook <>
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

Signed-off-by: Elena Petrova <>
 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];
+#if defined(CONFIG_UBSAN) && !defined(CONFIG_UBSAN_TRAP)
 	unsigned int			in_ubsan;

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