linux-kernel - [PATCH] binder: Return EFAULT if we fail BINDER_ENABLE_ONEWAY_SPAM

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Message-Id: <20210506193726.45118-1-luca.stefani.ge1@gmail.com>
Date:   Thu,  6 May 2021 21:37:25 +0200
From:   Luca Stefani <luca.stefani.ge1@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Luca Stefani <luca.stefani.ge1@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arve Hjønnevåg <arve@...roid.com>,
        Todd Kjos <tkjos@...roid.com>,
        Martijn Coenen <maco@...roid.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Christian Brauner <christian@...uner.io>,
        Hridya Valsaraju <hridya@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Hang Lu <hangl@...eaurora.org>, linux-kernel@...r.kernel.org
Subject: [PATCH] binder: Return EFAULT if we fail BINDER_ENABLE_ONEWAY_SPAM_DETECTION

All the other ioctl paths return EFAULT in case the
copy_from_user/copy_to_user call fails, make oneway spam detection
follow the same paradigm.

Fixes: a7dc1e6f99df ("binder: tell userspace to dump current backtrace
when detected oneway spamming")
Signed-off-by: Luca Stefani <luca.stefani.ge1@...il.com>
---
 drivers/android/binder.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 61d34e1dc59c..bcec598b89f2 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -4918,7 +4918,7 @@ static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		uint32_t enable;
 
 		if (copy_from_user(&enable, ubuf, sizeof(enable))) {
-			ret = -EINVAL;
+			ret = -EFAULT;
 			goto err;
 		}
 		binder_inner_proc_lock(proc);
-- 
2.31.1