From patchwork Wed Jul 31 06:37:25 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Alexis_Lothor=C3=A9?= X-Patchwork-Id: 815828 Received: from relay6-d.mail.gandi.net (relay6-d.mail.gandi.net [217.70.183.198]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7CF1416DEC8; Wed, 31 Jul 2024 06:37:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.198 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722407865; cv=none; b=hzYgRFeDVCNISUVfXlLxPmW1ItWCNK5TLhrXlMOb4IqM/Y4aru78X+MAUNSBiy/uUdYKFlI/bEFAjBuGhlSXkPXKqRfCAK9xXQIFkbx2OpQ1VYtkA51fgTKe36hyfemZoyiLq/uGgXHlFuo78YankR0RIBvhb1c61cK08DS0ges= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722407865; c=relaxed/simple; bh=uPssKhbI6QOeKlJxMzPIiV8K+K1eDcclLx7dmyTNqlY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=GsFv6kksWwRQa+ogjMuGFLSxnxg3BL061suVOWMy3/M4Al06zUW3WMKHjHT4L2Nt9zY5ukQhq1ZB/Moth08Ioam1mdrdKjuDCZq7Pj0ThOgbYRQxAfdi2HXswNjQBH8nXjNTHifmpcLlX6NI8xMC7axmaepyZuYNB1CUZoj0cRc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=kmDtsyS5; arc=none smtp.client-ip=217.70.183.198 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="kmDtsyS5" Received: by mail.gandi.net (Postfix) with ESMTPSA id 28271C000C; Wed, 31 Jul 2024 06:37:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1722407855; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=eGI657twu4HIPZJ41och6UzvK1qK7KKmh/zH9nar+iw=; b=kmDtsyS5U4kmqTNcutc4V5Xvby+YZn8n2Mt7OwWs929ACgLyvj+2IYu0b7Vni45LBvrjKn KKL8LNPKSizNYhoIv7epUljGiPHVsDaxYXHZtgT+10KK7ZUfR7Dw+svRA2maLD3bN9ZkGU bQx21o1VTt7YSL8bs9x6ljb0kcW151+6uBAxl5K2Sy29zm4FIK+wlltYw26dM43M63UVyJ HjEowld9P7ppo40Q98sMAPfh6V8vRK+lYOh2msJZiow89sW8FMGyTV5cAgOHGevqs+c+RV 7Za5cabtPLF1z0TCTZrJhUSEUfQQagHOCcoHqxVPb/gf8W9LF4VZGKpZJemwMQ== From: =?utf-8?q?Alexis_Lothor=C3=A9_=28eBPF_Foundation=29?= Date: Wed, 31 Jul 2024 08:37:25 +0200 Subject: [PATCH bpf-next v4 1/3] selftests/bpf: do not disable /dev/null device access in cgroup dev test Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240731-convert_dev_cgroup-v4-1-849425d90de6@bootlin.com> References: <20240731-convert_dev_cgroup-v4-0-849425d90de6@bootlin.com> In-Reply-To: <20240731-convert_dev_cgroup-v4-0-849425d90de6@bootlin.com> To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Mykola Lysenko , Shuah Khan Cc: ebpf@linuxfoundation.org, Thomas Petazzoni , Alan Maguire , Martin KaFai Lau , bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, =?utf-8?q?A?= =?utf-8?q?lexis_Lothor=C3=A9_=28eBPF_Foundation=29?= X-Mailer: b4 0.14.1 X-GND-Sasl: alexis.lothore@bootlin.com test_dev_cgroup currently loads a small bpf program allowing any access on urandom and zero devices, disabling access to any other device. It makes migrating this test to test_progs impossible, since this one manipulates extensively /dev/null. Allow /dev/null manipulation in dev_cgroup program to make its usage in test_progs framework possible. Update test_dev_cgroup.c as well to match this change while it has not been removed. Reviewed-by: Alan Maguire Acked-by: Stanislav Fomichev Signed-off-by: Alexis Lothoré (eBPF Foundation) --- tools/testing/selftests/bpf/progs/dev_cgroup.c | 4 ++-- tools/testing/selftests/bpf/test_dev_cgroup.c | 18 +++++++++--------- 2 files changed, 11 insertions(+), 11 deletions(-) diff --git a/tools/testing/selftests/bpf/progs/dev_cgroup.c b/tools/testing/selftests/bpf/progs/dev_cgroup.c index 79b54a4fa244..c1dfbd2b56fc 100644 --- a/tools/testing/selftests/bpf/progs/dev_cgroup.c +++ b/tools/testing/selftests/bpf/progs/dev_cgroup.c @@ -41,14 +41,14 @@ int bpf_prog1(struct bpf_cgroup_dev_ctx *ctx) bpf_trace_printk(fmt, sizeof(fmt), ctx->major, ctx->minor); #endif - /* Allow access to /dev/zero and /dev/random. + /* Allow access to /dev/null and /dev/urandom. * Forbid everything else. */ if (ctx->major != 1 || type != BPF_DEVCG_DEV_CHAR) return 0; switch (ctx->minor) { - case 5: /* 1:5 /dev/zero */ + case 3: /* 1:3 /dev/null */ case 9: /* 1:9 /dev/urandom */ return 1; } diff --git a/tools/testing/selftests/bpf/test_dev_cgroup.c b/tools/testing/selftests/bpf/test_dev_cgroup.c index adeaf63cb6fa..33f544f0005a 100644 --- a/tools/testing/selftests/bpf/test_dev_cgroup.c +++ b/tools/testing/selftests/bpf/test_dev_cgroup.c @@ -54,25 +54,25 @@ int main(int argc, char **argv) goto err; } - /* All operations with /dev/zero and and /dev/urandom are allowed, + /* All operations with /dev/null and /dev/urandom are allowed, * everything else is forbidden. */ - assert(system("rm -f /tmp/test_dev_cgroup_null") == 0); - assert(system("mknod /tmp/test_dev_cgroup_null c 1 3")); - assert(system("rm -f /tmp/test_dev_cgroup_null") == 0); - - /* /dev/zero is whitelisted */ assert(system("rm -f /tmp/test_dev_cgroup_zero") == 0); - assert(system("mknod /tmp/test_dev_cgroup_zero c 1 5") == 0); + assert(system("mknod /tmp/test_dev_cgroup_zero c 1 5")); assert(system("rm -f /tmp/test_dev_cgroup_zero") == 0); - assert(system("dd if=/dev/urandom of=/dev/zero count=64") == 0); + /* /dev/null is whitelisted */ + assert(system("rm -f /tmp/test_dev_cgroup_null") == 0); + assert(system("mknod /tmp/test_dev_cgroup_null c 1 3") == 0); + assert(system("rm -f /tmp/test_dev_cgroup_null") == 0); + + assert(system("dd if=/dev/urandom of=/dev/null count=64") == 0); /* src is allowed, target is forbidden */ assert(system("dd if=/dev/urandom of=/dev/full count=64")); /* src is forbidden, target is allowed */ - assert(system("dd if=/dev/random of=/dev/zero count=64")); + assert(system("dd if=/dev/random of=/dev/null count=64")); error = 0; printf("test_dev_cgroup:PASS\n");