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X-IPAS-Result: A2CyCAATtJJb/wHyM5BbGgEBAQEBAgEBAQEIAQEBAYMkJwNlAyBcKIxki0RMAQEBAQEBBooajWGBXBUYDQYBiCQhOBQBAgEBAQEBAQIBbBwMgjUMgngDAwECNxQgCwMDCQEBQAgIAwEtFREOBQYCAQEBGASDAAEoAYFLDAEDDKdNhGyFFQWKZYEQgQeBOYYGBBiBEAQBEgFshQsChjAHh0svjUwJhjiJQx2IWIYUASuLDYJchU0CBAsCFIFZIWRxMxpzgmyCJReDRYphYApxAQGJcQ8XgiUBAQ Received: from tarius.tycho.ncsc.mil ([144.51.242.1]) by EMSM-GH1-UEA10.NCSC.MIL with ESMTP; 07 Sep 2018 17:24:27 +0000 Received: from prometheus.infosec.tycho.ncsc.mil (prometheus.infosec.tycho.ncsc.mil [192.168.25.40]) by tarius.tycho.ncsc.mil (8.14.4/8.14.4) with ESMTP id w87HNC3C003959; Fri, 7 Sep 2018 13:23:29 -0400 Received: from tarius.tycho.ncsc.mil (tarius.infosec.tycho.ncsc.mil [144.51.242.1]) by prometheus.infosec.tycho.ncsc.mil (8.15.2/8.15.2) with ESMTP id w87Ghf2K033571 for ; Fri, 7 Sep 2018 12:43:41 -0400 Received: from goalie.tycho.ncsc.mil (goalie.infosec.tycho.ncsc.mil [144.51.242.250]) by tarius.tycho.ncsc.mil (8.14.4/8.14.4) with ESMTP id w87GhZJQ028400; Fri, 7 Sep 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Received: from www262.sakura.ne.jp (202.181.97.72) by fsav105.sakura.ne.jp (F-Secure/fsigk_smtp/530/fsav105.sakura.ne.jp); Sat, 08 Sep 2018 01:43:01 +0900 (JST) X-Virus-Status: clean(F-Secure/fsigk_smtp/530/fsav105.sakura.ne.jp) Received: from [192.168.1.8] (softbank060157066051.bbtec.net [60.157.66.51]) (authenticated bits=0) by www262.sakura.ne.jp (8.15.2/8.15.2) with ESMTPSA id w87Gh0FI018298 (version=TLSv1.2 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Sat, 8 Sep 2018 01:43:01 +0900 (JST) (envelope-from penguin-kernel@I-love.SAKURA.ne.jp) To: selinux@tycho.nsa.gov References: <000000000000038dab0575476b73@google.com> X-EEMSG-check-009: 444-444 From: Tetsuo Handa Message-ID: Date: Sat, 8 Sep 2018 01:42:58 +0900 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <000000000000038dab0575476b73@google.com> Content-Language: en-US X-Mailman-Approved-At: Fri, 07 Sep 2018 13:23:11 -0400 Subject: [PATCH] selinux: Add __GFP_NOWARN to allocation at str_read() X-BeenThere: selinux@tycho.nsa.gov X-Mailman-Version: 2.1.21 Precedence: list List-Id: "Security-Enhanced Linux \(SELinux\) mailing list" List-Post: List-Help: Cc: syzkaller-bugs@googlegroups.com, linux-kernel@vger.kernel.org, peter.enderborg@sony.com, syzbot , sds@tycho.nsa.gov Errors-To: selinux-bounces@tycho.nsa.gov Sender: "Selinux" X-Virus-Scanned: ClamAV using ClamSMTP syzbot is hitting warning at str_read() [1] because len parameter can become larger than KMALLOC_MAX_SIZE. We don't need to emit warning for this case. [1] https://syzkaller.appspot.com/bug?id=7f2f5aad79ea8663c296a2eedb81978401a908f0 Signed-off-by: Tetsuo Handa Reported-by: syzbot --- security/selinux/ss/policydb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c index e9394e7..f4eadd3 100644 --- a/security/selinux/ss/policydb.c +++ b/security/selinux/ss/policydb.c @@ -1101,7 +1101,7 @@ static int str_read(char **strp, gfp_t flags, void *fp, u32 len) if ((len == 0) || (len == (u32)-1)) return -EINVAL; - str = kmalloc(len + 1, flags); + str = kmalloc(len + 1, flags | __GFP_NOWARN); if (!str) return -ENOMEM;