netdev - Re: [PATCH net-next v6 01/11] bpf: Add eBPF program subtype and is_valid

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Message-ID: <b1d77fbd-6a1d-4016-a823-ec986995012b@digikod.net>
Date:   Fri, 31 Mar 2017 23:19:35 +0200
From:   Mickaël Salaün <mic@...ikod.net>
To:     Julia Lawall <julia.lawall@...6.fr>
Cc:     linux-kernel@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        Andy Lutomirski <luto@...capital.net>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Casey Schaufler <casey@...aufler-ca.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        David Drysdale <drysdale@...gle.com>,
        "David S . Miller" <davem@...emloft.net>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        James Morris <james.l.morris@...cle.com>,
        Jann Horn <jann@...jh.net>, Jonathan Corbet <corbet@....net>,
        Matthew Garrett <mjg59@...f.ucam.org>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Paul Moore <paul@...l-moore.com>,
        Sargun Dhillon <sargun@...gun.me>,
        "Serge E . Hallyn" <serge@...lyn.com>,
        Shuah Khan <shuah@...nel.org>, Tejun Heo <tj@...nel.org>,
        Thomas Graf <tgraf@...g.ch>, Will Drewry <wad@...omium.org>,
        kernel-hardening@...ts.openwall.com, linux-api@...r.kernel.org,
        linux-security-module@...r.kernel.org, netdev@...r.kernel.org,
        kbuild-all@...org
Subject: Re: [PATCH net-next v6 01/11] bpf: Add eBPF program subtype and
 is_valid_subtype() verifier (fwd)

Good catch, thanks again Julia!

 Mickaël

On 29/03/2017 17:14, Julia Lawall wrote:
> Size is unsigned, so not negative.
> 
> julia
> 
> ---------- Forwarded message ----------
> Date: Wed, 29 Mar 2017 23:06:01 +0800
> From: kbuild test robot <fengguang.wu@...el.com>
> To: kbuild@...org
> Cc: Julia Lawall <julia.lawall@...6.fr>
> Subject: Re: [PATCH net-next v6 01/11] bpf: Add eBPF program subtype and
>     is_valid_subtype() verifier
> 
> In-Reply-To: <20170328234650.19695-2-mic@...ikod.net>
> TO: "Mickaël Salaün" <mic@...ikod.net>
> 
> Hi Mickaël,
> 
> [auto build test WARNING on net-next/master]
> 
> url:    https://github.com/0day-ci/linux/commits/Micka-l-Sala-n/Landlock-LSM-Toward-unprivileged-sandboxing/20170329-211258
> :::::: branch date: 2 hours ago
> :::::: commit date: 2 hours ago
> 
>>> kernel/bpf/syscall.c:1041:5-9: WARNING: Unsigned expression compared with zero: size < 0
> 
> git remote add linux-review https://github.com/0day-ci/linux
> git remote update linux-review
> git checkout 07d282aef4f60235407284c0be81d01e352e040b
> vim +1041 kernel/bpf/syscall.c
> 
> f4324551 Daniel Mack        2016-11-23  1025  		return -EINVAL;
> f4324551 Daniel Mack        2016-11-23  1026  	}
> f4324551 Daniel Mack        2016-11-23  1027
> 7f677633 Alexei Starovoitov 2017-02-10  1028  	return ret;
> f4324551 Daniel Mack        2016-11-23  1029  }
> f4324551 Daniel Mack        2016-11-23  1030  #endif /* CONFIG_CGROUP_BPF */
> f4324551 Daniel Mack        2016-11-23  1031
> 99c55f7d Alexei Starovoitov 2014-09-26  1032  SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, size)
> 99c55f7d Alexei Starovoitov 2014-09-26  1033  {
> 99c55f7d Alexei Starovoitov 2014-09-26  1034  	union bpf_attr attr = {};
> 99c55f7d Alexei Starovoitov 2014-09-26  1035  	int err;
> 99c55f7d Alexei Starovoitov 2014-09-26  1036
> 1be7f75d Alexei Starovoitov 2015-10-07  1037  	if (!capable(CAP_SYS_ADMIN) && sysctl_unprivileged_bpf_disabled)
> 99c55f7d Alexei Starovoitov 2014-09-26  1038  		return -EPERM;
> 99c55f7d Alexei Starovoitov 2014-09-26  1039
> 07d282ae Mickaël Salaün     2017-03-29  1040  	size = check_user_buf((void __user *)uattr, size, sizeof(attr));
> 07d282ae Mickaël Salaün     2017-03-29 @1041  	if (size < 0)
> 07d282ae Mickaël Salaün     2017-03-29  1042  		return size;
> 99c55f7d Alexei Starovoitov 2014-09-26  1043
> 99c55f7d Alexei Starovoitov 2014-09-26  1044  	/* copy attributes from user space, may be less than sizeof(bpf_attr) */
> 99c55f7d Alexei Starovoitov 2014-09-26  1045  	if (copy_from_user(&attr, uattr, size) != 0)
> 99c55f7d Alexei Starovoitov 2014-09-26  1046  		return -EFAULT;
> 99c55f7d Alexei Starovoitov 2014-09-26  1047
> 99c55f7d Alexei Starovoitov 2014-09-26  1048  	switch (cmd) {
> 99c55f7d Alexei Starovoitov 2014-09-26  1049  	case BPF_MAP_CREATE:
> 
> ---
> 0-DAY kernel test infrastructure                Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
> 



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