From: KP Singh <kpsingh@chromium.org>
To: linux-kernel@vger.kernel.org, bpf@vger.kernel.org,
linux-security-module@vger.kernel.org
Cc: "Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"James Morris" <jmorris@namei.org>,
"Kees Cook" <keescook@chromium.org>,
"Thomas Garnier" <thgarnie@chromium.org>,
"Michael Halcrow" <mhalcrow@google.com>,
"Paul Turner" <pjt@google.com>,
"Brendan Gregg" <brendan.d.gregg@gmail.com>,
"Jann Horn" <jannh@google.com>,
"Matthew Garrett" <mjg59@google.com>,
"Christian Brauner" <christian@brauner.io>,
"Mickaël Salaün" <mic@digikod.net>,
"Florent Revest" <revest@chromium.org>,
"Brendan Jackman" <jackmanb@chromium.org>,
"Martin KaFai Lau" <kafai@fb.com>,
"Song Liu" <songliubraving@fb.com>, "Yonghong Song" <yhs@fb.com>,
"Serge E. Hallyn" <serge@hallyn.com>,
"Mauro Carvalho Chehab" <mchehab+samsung@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Nicolas Ferre" <nicolas.ferre@microchip.com>,
"Stanislav Fomichev" <sdf@google.com>,
"Quentin Monnet" <quentin.monnet@netronome.com>,
"Andrey Ignatov" <rdna@fb.com>, "Joe Stringer" <joe@wand.net.nz>
Subject: [PATCH bpf-next v1 08/13] bpf: lsm: Show attached program names in hook read handler.
Date: Fri, 20 Dec 2019 16:42:03 +0100 [thread overview]
Message-ID: <20191220154208.15895-9-kpsingh@chromium.org> (raw)
In-Reply-To: <20191220154208.15895-1-kpsingh@chromium.org>
From: KP Singh <kpsingh@google.com>
For inspectability the system administrator should be able to view the
list of active KRSI programs:
bash # cat /sys/kernel/security/bpf/bprm_check_security
bpf_prog1
Signed-off-by: KP Singh <kpsingh@google.com>
---
security/bpf/lsm_fs.c | 81 ++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 80 insertions(+), 1 deletion(-)
diff --git a/security/bpf/lsm_fs.c b/security/bpf/lsm_fs.c
index b271e9582d0f..01a89bce1347 100644
--- a/security/bpf/lsm_fs.c
+++ b/security/bpf/lsm_fs.c
@@ -10,6 +10,7 @@
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/filter.h>
+#include <linux/seq_file.h>
#include <linux/bpf.h>
#include <linux/security.h>
#include <linux/bpf_lsm.h>
@@ -19,7 +20,85 @@
static struct dentry *bpf_lsm_dir;
-static const struct file_operations hook_ops = {};
+static void *seq_start(struct seq_file *m, loff_t *pos)
+ __acquires(RCU)
+{
+ struct bpf_prog_array_item *item;
+ struct bpf_prog_array *progs;
+ struct bpf_lsm_hook *h;
+ struct dentry *dentry;
+
+ /*
+ * rcu_read_lock() must be held before any return statement because the
+ * stop() will always be called and thus call rcu_read_unlock()
+ */
+ rcu_read_lock();
+
+ dentry = file_dentry(m->file);
+ h = dentry->d_fsdata;
+ if (WARN_ON(!h))
+ return ERR_PTR(-EFAULT);
+
+ progs = rcu_dereference(h->progs);
+ if (!progs)
+ return NULL;
+
+ /* Assumes that no &dummy_bpf_prog entries exist */
+ if ((*pos) >= bpf_prog_array_length(progs))
+ return NULL;
+
+ item = progs->items + *pos;
+ if (!item->prog)
+ return NULL;
+
+ return item;
+}
+
+static void *seq_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ struct bpf_prog_array_item *item = v;
+
+ item++;
+ ++*pos;
+
+ if (!item->prog)
+ return NULL;
+
+ return item;
+}
+
+static void seq_stop(struct seq_file *m, void *v)
+ __releases(RCU)
+{
+ rcu_read_unlock();
+}
+
+static int show_prog(struct seq_file *m, void *v)
+{
+ struct bpf_prog_array_item *item = v;
+
+ seq_printf(m, "%s\n", item->prog->aux->name);
+ return 0;
+}
+
+static const struct seq_operations hook_seq_ops = {
+ .show = show_prog,
+ .start = seq_start,
+ .next = seq_next,
+ .stop = seq_stop,
+};
+
+static int hook_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &hook_seq_ops);
+}
+
+static const struct file_operations hook_ops = {
+ .open = hook_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
int bpf_lsm_fs_initialized;
--
2.20.1
next prev parent reply other threads:[~2019-12-20 15:42 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-20 15:41 [PATCH bpf-next v1 00/13] MAC and Audit policy using eBPF (KRSI) KP Singh
2019-12-20 15:41 ` [PATCH bpf-next v1 01/13] bpf: Refactor BPF_EVENT context macros to its own header KP Singh
2019-12-20 20:10 ` Andrii Nakryiko
2019-12-20 20:26 ` KP Singh
2019-12-20 15:41 ` [PATCH bpf-next v1 02/13] bpf: lsm: Add a skeleton and config options KP Singh
2020-01-07 21:13 ` James Morris
2019-12-20 15:41 ` [PATCH bpf-next v1 03/13] bpf: lsm: Introduce types for eBPF based LSM KP Singh
2019-12-20 15:41 ` [PATCH bpf-next v1 04/13] bpf: lsm: Allow btf_id based attachment for LSM hooks KP Singh
2019-12-23 23:54 ` Andrii Nakryiko
2019-12-30 19:22 ` KP Singh
2019-12-20 15:42 ` [PATCH bpf-next v1 05/13] tools/libbpf: Add support in libbpf for BPF_PROG_TYPE_LSM KP Singh
2019-12-24 0:07 ` Andrii Nakryiko
2019-12-24 0:09 ` Andrii Nakryiko
2020-01-03 23:59 ` KP Singh
2019-12-20 15:42 ` [PATCH bpf-next v1 06/13] bpf: lsm: Init Hooks and create files in securityfs KP Singh
2019-12-24 6:28 ` Andrii Nakryiko
2019-12-30 15:37 ` KP Singh
2019-12-30 18:52 ` Andrii Nakryiko
2019-12-30 19:20 ` Kees Cook
2020-01-03 23:53 ` KP Singh
2020-01-07 21:22 ` James Morris
2019-12-20 15:42 ` [PATCH bpf-next v1 07/13] bpf: lsm: Implement attach, detach and execution KP Singh
2019-12-24 5:48 ` Andrii Nakryiko
2020-01-07 21:27 ` James Morris
2019-12-20 15:42 ` KP Singh [this message]
2020-01-07 21:28 ` [PATCH bpf-next v1 08/13] bpf: lsm: Show attached program names in hook read handler James Morris
2019-12-20 15:42 ` [PATCH bpf-next v1 09/13] bpf: lsm: Add a helper function bpf_lsm_event_output KP Singh
2019-12-24 6:36 ` Andrii Nakryiko
2019-12-30 15:11 ` KP Singh
2019-12-30 18:56 ` Andrii Nakryiko
2019-12-20 15:42 ` [PATCH bpf-next v1 10/13] bpf: lsm: Handle attachment of the same program KP Singh
2019-12-24 6:38 ` Andrii Nakryiko
2020-01-08 18:21 ` James Morris
2019-12-20 15:42 ` [PATCH bpf-next v1 11/13] tools/libbpf: Add bpf_program__attach_lsm KP Singh
2019-12-24 6:44 ` Andrii Nakryiko
2020-01-08 18:24 ` James Morris
2019-12-20 15:42 ` [PATCH bpf-next v1 12/13] bpf: lsm: Add selftests for BPF_PROG_TYPE_LSM KP Singh
2019-12-24 6:49 ` Andrii Nakryiko
2020-01-04 0:09 ` KP Singh
2020-01-09 17:59 ` Andrii Nakryiko
2020-01-08 18:25 ` James Morris
2019-12-20 15:42 ` [PATCH bpf-next v1 13/13] bpf: lsm: Add Documentation KP Singh
2019-12-20 17:17 ` [PATCH bpf-next v1 00/13] MAC and Audit policy using eBPF (KRSI) Casey Schaufler
2019-12-20 17:38 ` KP Singh
2019-12-30 19:15 ` Kees Cook
2020-01-08 15:25 ` Stephen Smalley
2020-01-08 18:58 ` James Morris
2020-01-08 19:33 ` Stephen Smalley
2020-01-09 18:11 ` James Morris
2020-01-09 18:23 ` Greg Kroah-Hartman
2020-01-09 18:58 ` Stephen Smalley
2020-01-09 19:07 ` James Morris
2020-01-09 19:43 ` KP Singh
2020-01-09 19:47 ` Stephen Smalley
2020-01-10 15:27 ` KP Singh
2020-01-10 17:48 ` James Morris
2020-01-10 17:53 ` Alexei Starovoitov
2020-01-14 16:54 ` Stephen Smalley
2020-01-14 17:42 ` Stephen Smalley
2020-01-15 2:48 ` Alexei Starovoitov
2020-01-15 13:59 ` Stephen Smalley
2020-01-15 14:09 ` Greg Kroah-Hartman
2020-01-15 22:23 ` Alexei Starovoitov
2020-01-09 19:11 ` KP Singh
2020-01-08 18:27 ` James Morris
2019-12-20 22:46 ` Mickaël Salaün
2019-12-30 19:30 ` Kees Cook
2019-12-31 12:11 ` Mickaël Salaün
2019-12-22 1:27 ` Alexei Starovoitov
2019-12-30 14:58 ` KP Singh
2019-12-30 19:14 ` Andrii Nakryiko
2019-12-24 6:51 ` Andrii Nakryiko
2019-12-30 15:04 ` KP Singh
2019-12-30 18:58 ` Andrii Nakryiko
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20191220154208.15895-9-kpsingh@chromium.org \
--to=kpsingh@chromium.org \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=brendan.d.gregg@gmail.com \
--cc=christian@brauner.io \
--cc=daniel@iogearbox.net \
--cc=davem@davemloft.net \
--cc=gregkh@linuxfoundation.org \
--cc=jackmanb@chromium.org \
--cc=jannh@google.com \
--cc=jmorris@namei.org \
--cc=joe@wand.net.nz \
--cc=kafai@fb.com \
--cc=keescook@chromium.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-security-module@vger.kernel.org \
--cc=mchehab+samsung@kernel.org \
--cc=mhalcrow@google.com \
--cc=mic@digikod.net \
--cc=mjg59@google.com \
--cc=nicolas.ferre@microchip.com \
--cc=pjt@google.com \
--cc=quentin.monnet@netronome.com \
--cc=rdna@fb.com \
--cc=revest@chromium.org \
--cc=sdf@google.com \
--cc=serge@hallyn.com \
--cc=songliubraving@fb.com \
--cc=thgarnie@chromium.org \
--cc=yhs@fb.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).