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From: Al Viro <viro@zeniv.linux.org.uk>
To: "Mickaël Salaün" <mic@digikod.net>
Cc: "Alexei Starovoitov" <alexei.starovoitov@gmail.com>,
	"Mickaël Salaün" <mickael.salaun@ssi.gouv.fr>,
	linux-kernel@vger.kernel.org,
	"Alexei Starovoitov" <ast@kernel.org>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Andy Lutomirski" <luto@amacapital.net>,
	"Arnaldo Carvalho de Melo" <acme@kernel.org>,
	"Casey Schaufler" <casey@schaufler-ca.com>,
	"Daniel Borkmann" <daniel@iogearbox.net>,
	"David Drysdale" <drysdale@google.com>,
	"David S . Miller" <davem@davemloft.net>,
	"Eric W . Biederman" <ebiederm@xmission.com>,
	"James Morris" <jmorris@namei.org>, "Jann Horn" <jann@thejh.net>,
	"John Johansen" <john.johansen@canonical.com>,
	"Jonathan Corbet" <corbet@lwn.net>,
	"Kees Cook" <keescook@chromium.org>,
	"Michael Kerrisk" <mtk.manpages@gmail.com>,
	"Paul Moore" <paul@paul-moore.com>,
	"Sargun Dhillon" <sargun@sargun.me>,
	"Serge E . Hallyn" <serge@hallyn.com>,
	"Shuah Khan" <shuah@kernel.org>,
	"Stephen Smalley" <sds@tycho.nsa.gov>,
	"Tejun Heo" <tj@kernel.org>,
	"Tetsuo Handa" <penguin-kernel@i-love.sakura.ne.jp>,
	"Thomas Graf" <tgraf@suug.ch>, "Tycho Andersen" <tycho@tycho.ws>,
	"Will Drewry" <wad@chromium.org>,
	kernel-hardening@lists.openwall.com, linux-api@vger.kernel.org,
	linux-fsdevel@vger.kernel.org,
	linux-security-module@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH bpf-next v10 06/10] bpf,landlock: Add a new map type: inode
Date: Sun, 8 Sep 2019 23:19:54 +0100
Message-ID: <20190908221954.GD1131@ZenIV.linux.org.uk> (raw)
In-Reply-To: <894922a2-1150-366c-3f08-c8b759da0742@digikod.net>

On Mon, Sep 09, 2019 at 12:09:57AM +0200, Mickaël Salaün wrote:

> >>> +    rcu_read_lock();
> >>> +    ptr = htab_map_lookup_elem(map, &inode);
> >>> +    iput(inode);

Wait a sec.  You are doing _what_ under rcu_read_lock()?

> >>> +    if (IS_ERR(ptr)) {
> >>> +            ret = PTR_ERR(ptr);
> >>> +    } else if (!ptr) {
> >>> +            ret = -ENOENT;
> >>> +    } else {
> >>> +            ret = 0;
> >>> +            copy_map_value(map, value, ptr);
> >>> +    }
> >>> +    rcu_read_unlock();

  reply index

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-21 21:31 [PATCH bpf-next v10 00/10] Landlock LSM: Toward unprivileged sandboxing Mickaël Salaün
2019-07-21 21:31 ` [PATCH bpf-next v10 01/10] fs,security: Add a new file access type: MAY_CHROOT Mickaël Salaün
2019-07-21 21:31 ` [PATCH bpf-next v10 02/10] bpf: Add expected_attach_triggers and a is_valid_triggers() verifier Mickaël Salaün
2019-07-21 21:31 ` [PATCH bpf-next v10 03/10] bpf,landlock: Define an eBPF program type for Landlock hooks Mickaël Salaün
2019-07-21 21:31 ` [PATCH bpf-next v10 04/10] seccomp,landlock: Enforce Landlock programs per process hierarchy Mickaël Salaün
2019-07-21 21:31 ` [PATCH bpf-next v10 05/10] landlock: Handle filesystem access control Mickaël Salaün
2019-07-21 21:31 ` [PATCH bpf-next v10 06/10] bpf,landlock: Add a new map type: inode Mickaël Salaün
2019-07-27  1:40   ` Alexei Starovoitov
2019-07-31 18:46     ` Mickaël Salaün
2019-07-31 18:58       ` Alexei Starovoitov
2019-07-31 19:11         ` Mickaël Salaün
2019-08-01 17:35           ` Alexei Starovoitov
2019-08-06 16:24             ` Mickaël Salaün
2019-09-08 22:09       ` Mickaël Salaün
2019-09-08 22:19         ` Al Viro [this message]
2019-07-21 21:31 ` [PATCH bpf-next v10 07/10] landlock: Add ptrace restrictions Mickaël Salaün
2019-07-21 21:31 ` [PATCH bpf-next v10 08/10] bpf: Add a Landlock sandbox example Mickaël Salaün
2019-07-21 21:31 ` [PATCH bpf-next v10 09/10] bpf,landlock: Add tests for Landlock Mickaël Salaün
2019-07-21 21:31 ` [PATCH bpf-next v10 10/10] landlock: Add user and kernel documentation " Mickaël Salaün
2019-07-31  1:53   ` Randy Dunlap
2019-08-01 17:03     ` Mickaël Salaün
2019-08-01 17:49       ` Randy Dunlap

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