linux-kernel - [PATCH v7 6/9] pidfd: Replace open-coded receive

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Date:   Thu,  9 Jul 2020 11:26:39 -0700
From:   Kees Cook <keescook@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     Kees Cook <keescook@...omium.org>,
        Sargun Dhillon <sargun@...gun.me>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Christian Brauner <christian@...uner.io>,
        Tycho Andersen <tycho@...ho.ws>,
        David Laight <David.Laight@...LAB.COM>,
        Christoph Hellwig <hch@....de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Aleksa Sarai <cyphar@...har.com>,
        Matt Denton <mpdenton@...gle.com>,
        Jann Horn <jannh@...gle.com>, Chris Palmer <palmer@...gle.com>,
        Robert Sesek <rsesek@...gle.com>,
        Giuseppe Scrivano <gscrivan@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Will Drewry <wad@...omium.org>, Shuah Khan <shuah@...nel.org>,
        netdev@...r.kernel.org, containers@...ts.linux-foundation.org,
        linux-api@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: [PATCH v7 6/9] pidfd: Replace open-coded receive_fd()

Replace the open-coded version of receive_fd() with a call to the
new helper.

Thanks to Vamshi K Sthambamkadi <vamshi.k.sthambamkadi@...il.com> for
catching a missed fput() in an earlier version of this patch.

Reviewed-by: Sargun Dhillon <sargun@...gun.me>
Acked-by: Christian Brauner <christian.brauner@...ntu.com>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 kernel/pid.c | 15 ++-------------
 1 file changed, 2 insertions(+), 13 deletions(-)

diff --git a/kernel/pid.c b/kernel/pid.c
index 85ed00abdc7c..da5aea5f04fa 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -636,19 +636,8 @@ static int pidfd_getfd(struct pid *pid, int fd)
 	if (IS_ERR(file))
 		return PTR_ERR(file);
 
-	ret = security_file_receive(file);
-	if (ret) {
-		fput(file);
-		return ret;
-	}
-
-	ret = get_unused_fd_flags(O_CLOEXEC);
-	if (ret < 0) {
-		fput(file);
-	} else {
-		fd_install(ret, file);
-		__receive_sock(file);
-	}
+	ret = receive_fd(file, O_CLOEXEC);
+	fput(file);
 
 	return ret;
 }
-- 
2.25.1