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

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Message-ID: <alpine.DEB.2.20.1703291712590.2989@hadrien>
Date:   Wed, 29 Mar 2017 17:14:11 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Mickaël Salaün <mic@...ikod.net>
cc:     linux-kernel@...r.kernel.org,
        Mickaël Salaün <mic@...ikod.net>,
        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, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v6 01/11] bpf: Add eBPF program subtype and
 is_valid_subtype() verifier (fwd)

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:

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