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Message-Id: <1503956111-36652-23-git-send-email-keescook@chromium.org>
Date: Mon, 28 Aug 2017 14:35:03 -0700
From: Kees Cook <keescook@...omium.org>
To: linux-kernel@...r.kernel.org
Cc: Kees Cook <keescook@...omium.org>,
David Windsor <dave@...lcore.net>,
Vlad Yasevich <vyasevich@...il.com>,
Neil Horman <nhorman@...driver.com>,
"David S. Miller" <davem@...emloft.net>,
linux-sctp@...r.kernel.org,
netdev@...r.kernel.org,
linux-mm@...ck.org,
kernel-hardening@...ts.openwall.com
Subject: [PATCH v2 22/30] sctp: Copy struct sctp_sock.autoclose to userspace using put_user()
From: David Windsor <dave@...lcore.net>
The autoclose field can be copied with put_user(), so there is no need to
use copy_to_user(). In both cases, hardened usercopy is being bypassed
since the size is constant, and not open to runtime manipulation.
This patch is verbatim from Brad Spengler/PaX Team's PAX_USERCOPY
whitelisting code in the last public patch of grsecurity/PaX based on my
understanding of the code. Changes or omissions from the original code are
mine and don't reflect the original grsecurity/PaX code.
Signed-off-by: David Windsor <dave@...lcore.net>
[kees: adjust commit log]
Cc: Vlad Yasevich <vyasevich@...il.com>
Cc: Neil Horman <nhorman@...driver.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: linux-sctp@...r.kernel.org
Cc: netdev@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
net/sctp/socket.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index c8784cb216e4..a29e41e19d64 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -4882,7 +4882,7 @@ static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optv
len = sizeof(int);
if (put_user(len, optlen))
return -EFAULT;
- if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
+ if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
return -EFAULT;
return 0;
}
--
2.7.4
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