From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AB8JxZpsFpp1CS6oRmAL0xDx/ON8cWLZYWG72Vy3o2AGcHUXuvcyFFa3OyRLygM3Swg4SoCqZUId ARC-Seal: i=1; a=rsa-sha256; t=1526280742; cv=none; d=google.com; s=arc-20160816; b=SnT01ZfudFYjtVxsY/QDv3BxHJCfFSzjetjbDpTYXVWaM5/1a24iBfZsNac56SxUpX mMN44c+5IlB2tfXwOk5eaNKPPJrCHihByavI7dXMYoHOz0hKztv8UWD5K+ImhqTOLT4F QxqFS5YjlgmR0XMuxqCmoLLMia0aPEfRz5BoLXwyAUZhXhLEP8VO/CReiT/m+KZzEP+s f06QEPb6vYTrnRBfEnPUyupgjLJP74uSreaeylDP182bswPvwlwFFAiWOfZSRETANvnQ JyUr+0HMKo0tAJqFnrb5D4uVbIvmDz3Ty5ZOzHZIbFwpO+c7u+dSKhm05WgjwJ4RqUjX m1zg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:dkim-signature:arc-authentication-results; bh=j2KIzCpwN0IwPya6T5Vs9YL8xlygYwa3tS/0NBKzWdE=; b=rderNiL2VgZQFKxNrU7kWSRPqMCZp0gJN1T9ss3Ml6ytlivNoyoZg0+lj86f0DUYDz 5Y5UqjTSV8FXGPW0CpV7crTcx+ZthbLITSenVyywVH6TXokmRG5RhR1lkq1T6CZrwsrr 4VFvbh8Y9ZX73dCk/m87RE/MLAcnAMaRcFOuNKVQZsWlDUgPBrOaJ0D7cTjhirs9ZtGo YD8M5H/oxMK3i/QJL4TnH8MOerVXwZJHhTf3M8IJfc8EdYfmUfjpsn6xJodH6bh8IJ9s sti8u9HlsjdefJZUXzclIjIkcfvPwxIXrL3FsSqcZRlyFSE3jkNG5keJmKc8+fFEpGe6 29qw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=PcYLq3oN; spf=pass (google.com: domain of srs0=ywzk=ib=linuxfoundation.org=gregkh@kernel.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=SRS0=ywzk=IB=linuxfoundation.org=gregkh@kernel.org Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=PcYLq3oN; spf=pass (google.com: domain of srs0=ywzk=ib=linuxfoundation.org=gregkh@kernel.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=SRS0=ywzk=IB=linuxfoundation.org=gregkh@kernel.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eric Dumazet , syzbot , Pavel Emelyanov , "David S. Miller" Subject: [PATCH 4.4 40/56] tcp: fix TCP_REPAIR_QUEUE bound checking Date: Mon, 14 May 2018 08:48:45 +0200 Message-Id: <20180514064758.515820440@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180514064754.853201981@linuxfoundation.org> References: <20180514064754.853201981@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1600421256400782370?= X-GMAIL-MSGID: =?utf-8?q?1600421355399474212?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet commit bf2acc943a45d2b2e8a9f1a5ddff6b6e43cc69d9 upstream. syzbot is able to produce a nasty WARN_ON() in tcp_verify_left_out() with following C-repro : socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 3 setsockopt(3, SOL_TCP, TCP_REPAIR, [1], 4) = 0 setsockopt(3, SOL_TCP, TCP_REPAIR_QUEUE, [-1], 4) = 0 bind(3, {sa_family=AF_INET, sin_port=htons(20002), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 sendto(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1242, MSG_FASTOPEN, {sa_family=AF_INET, sin_port=htons(20002), sin_addr=inet_addr("127.0.0.1")}, 16) = 1242 setsockopt(3, SOL_TCP, TCP_REPAIR_WINDOW, "\4\0\0@+\205\0\0\377\377\0\0\377\377\377\177\0\0\0\0", 20) = 0 writev(3, [{"\270", 1}], 1) = 1 setsockopt(3, SOL_TCP, TCP_REPAIR_OPTIONS, "\10\0\0\0\0\0\0\0\0\0\0\0|\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 386) = 0 writev(3, [{"\210v\r[\226\320t\231qwQ\204\264l\254\t\1\20\245\214p\350H\223\254;\\\37\345\307p$"..., 3144}], 1) = 3144 The 3rd system call looks odd : setsockopt(3, SOL_TCP, TCP_REPAIR_QUEUE, [-1], 4) = 0 This patch makes sure bound checking is using an unsigned compare. Fixes: ee9952831cfd ("tcp: Initial repair mode") Signed-off-by: Eric Dumazet Reported-by: syzbot Cc: Pavel Emelyanov Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ipv4/tcp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -2450,7 +2450,7 @@ static int do_tcp_setsockopt(struct sock case TCP_REPAIR_QUEUE: if (!tp->repair) err = -EPERM; - else if (val < TCP_QUEUES_NR) + else if ((unsigned int)val < TCP_QUEUES_NR) tp->repair_queue = val; else err = -EINVAL;