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Commit 7483e5d4 authored by Dmitry Vyukov's avatar Dmitry Vyukov Committed by Linus Torvalds
Browse files

kcov: support compat processes 

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.

Link: http://lkml.kernel.org/r/20170823100553.55812-1-dvyukov@google.com


Signed-off-by: default avatarDmitry Vyukov <dvyukov@google.com>
Cc: <syzkaller@googlegroups.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 229cf16d

kernel/kcov.c

+1 −0
Original line number Original line Diff line number Diff line
@@ -270,6 +270,7 @@ static long kcov_ioctl(struct file *filep, unsigned int cmd, unsigned long arg) 
static const struct file_operations kcov_fops = {

static const struct file_operations kcov_fops = {

	.open		= kcov_open,

	.open		= kcov_open,

	.unlocked_ioctl	= kcov_ioctl,

	.unlocked_ioctl	= kcov_ioctl,

	.compat_ioctl	= kcov_ioctl,

	.mmap		= kcov_mmap,

	.mmap		= kcov_mmap,

	.release        = kcov_close,

	.release        = kcov_close,

};

};