From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AB8JxZoSvRGCjCGHjo7bHa4WTmgz/tLeAf1in5kw1vJRW7UCafoUTDVqeuTsY/+jPsDwlCiJuN+Q ARC-Seal: i=1; a=rsa-sha256; t=1526280598; cv=none; d=google.com; s=arc-20160816; b=q+W6gH6IBO7Nsx+9RtT7jPkVg8SMJ/eOoJQFgUMZHDe3lr5EgOxLbPkOwA2ocPjuzm hHKdaTbEWWGYd1ZkOFP8V1OOHMLeNcomEmqtCZXp06hZ2T7WgYv6ECusDEdsX4mVBDtB E4Y8bh5KXdu1psR1M8Tl0RlsCEfVZny87lL4qtwSdIpAx6JaFORaR34VW7DOlyFinJ+I zImjQC3MVWsYNZe0wyRyor0Wm/UA4cqQql/ryGvhKxw7iWf2d+34LSB+WXVWAsqdmoCF JdDvCK8M/6ZZujJQYATCXCZmXNspQjI+sHWltu9oxCw63J8ztzgCzcguBry+j6QXppda dbvQ== 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=hG4yVooZ5qjJuAhMWOvbL/bQEvJcGn4+nXJcc8wQkp0=; b=au0u1dBPWAeFPB/k0Y+7NkrGm1dj+Ww5ti+2GmHA7eejX6MjVTvu3qXsafkFAmDiYV vEQuqEPrcLpm5GZcc4z0Q7cLbRjc4irY5ZDHr1LZ4IFmHifjwnLLINso2qT9LGWCXsW0 yly8KRtzyZaJwMQRAQU55v4RgvPvr08QYDG5RC0jkppB+r/WpgNiOrqFaW28I85FJU8p jitH2OrKJ3lj2QHvVJH0SibC1AFLblzc5dbxlMZP28oUBHjrmg6hX9AjUjfFZLon+KhQ 8OApLV/7GEjmpmvxSjn1HNJ7hti5KX2eq7UlpdIwLtYRWUgcGt61b2RKZU2FAcVk4lwZ ydzA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=oIRatP78; 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=oIRatP78; 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, Tan Xiaojun , "Peter Zijlstra (Intel)" , acme@kernel.org, alexander.shishkin@linux.intel.com, Arnaldo Carvalho de Melo , Jiri Olsa , Linus Torvalds , Stephane Eranian , Thomas Gleixner , Vince Weaver , Ingo Molnar , Guenter Roeck Subject: [PATCH 3.18 02/23] perf/core: Fix the perf_cpu_time_max_percent check Date: Mon, 14 May 2018 08:48:31 +0200 Message-Id: <20180514064704.147242899@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180514064704.046463679@linuxfoundation.org> References: <20180514064704.046463679@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?1600421204769613896?= X-GMAIL-MSGID: =?utf-8?q?1600421204769613896?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 3.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tan Xiaojun commit 1572e45a924f254d9570093abde46430c3172e3d upstream. Use "proc_dointvec_minmax" instead of "proc_dointvec" to check the input value from user-space. If not, we can set a big value and some vars will overflow like "sysctl_perf_event_sample_rate" which will cause a lot of unexpected problems. Signed-off-by: Tan Xiaojun Signed-off-by: Peter Zijlstra (Intel) Cc: Cc: Cc: Alexander Shishkin Cc: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Thomas Gleixner Cc: Vince Weaver Link: http://lkml.kernel.org/r/1487829879-56237-1-git-send-email-tanxiaojun@huawei.com Signed-off-by: Ingo Molnar Cc: Guenter Roeck Signed-off-by: Greg Kroah-Hartman --- kernel/events/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -224,7 +224,7 @@ int perf_cpu_time_max_percent_handler(st void __user *buffer, size_t *lenp, loff_t *ppos) { - int ret = proc_dointvec(table, write, buffer, lenp, ppos); + int ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); if (ret || !write) return ret;