[PATCH] kcov: support compat processes

[PATCH] kcov: support compat processes

[Dmitry Vyukov]

Support compat processes in KCOV by providing compat_ioctl callback.
Compat mode uses the same ioctl callback: we have 2 commands that
do not use the argument and 1 that already checks that the arg does
not overflow INT_MAX.
This allows to use KCOV-guided fuzzing in compat processes.

Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Cc: syzkaller@googlegroups.com
Cc: linux-mm@kvack.org
Cc: Andrew Morton <akpm@linux-foundation.org>
---
 kernel/kcov.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/kcov.c b/kernel/kcov.c
index cd771993f96f..3f693a0f6f3e 100644
--- a/kernel/kcov.c
+++ b/kernel/kcov.c
@@ -270,6 +270,7 @@ static long kcov_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
 static const struct file_operations kcov_fops = {
 	.open		= kcov_open,
 	.unlocked_ioctl	= kcov_ioctl,
+	.compat_ioctl	= kcov_ioctl,
 	.mmap		= kcov_mmap,
 	.release        = kcov_close,
 };
-- 
2.14.1.342.g6490525c54-goog

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