From patchwork Thu Dec 19 21:16:07 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hamza Mahfooz X-Patchwork-Id: 13915829 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 3E28A1C3F13; Thu, 19 Dec 2024 21:16:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734642996; cv=none; b=HlOmZ7TSumgNggcMwHVOZzOlfSB9jVt967ufYdorANS9Fe4pJzTSGBzz7kKDDkg15TO6MO3dKn/fvN3Za/MH7u9uyeQyOpotghTet+o8EL0e2/qTEz6n8p/RYpxPAffNa21byR8EjLxFrK/XL5i65yznzYGEICWxAGVnOwx7Fvo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734642996; c=relaxed/simple; bh=XKdGAHeRXw/DdS9tToFsPARQHrLBUbT9Zk45sRUvvjc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=YedLPad7Au4XS3P/lkJVrgfRnAL5jYxWTMnTF0etbg2W3AcRKxixHhrPmIxoFy+tjzJOqbgbTCjqwc9cM6CsEvQiHm/3G7wwcPQTF/AgzmIKLl/fflYI8yCnktpn0r+inD5UJlf6IiRM3p3EE/w/Qmhxt44k2uJZknOvbzqkMQw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=dvXYfQIt; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="dvXYfQIt" Received: from hm-sls2.corp.microsoft.com (bras-base-toroon4332w-grc-63-70-49-166-4.dsl.bell.ca [70.49.166.4]) by linux.microsoft.com (Postfix) with ESMTPSA id 6CCD120ACD87; Thu, 19 Dec 2024 13:16:28 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 6CCD120ACD87 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1734642988; bh=Q7isC5kCbRv3kAbF8ov5jvgkaOrcxKNTguRPWo2zAoU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dvXYfQItZB8nprwta0cH6NehuNA1ldDoXlxtv1au3O6agrnGAduWvijxTmz+BSdVH Jreqi5q9xgexbarYk+3efiYi2LQdFoP1CVQHqx/UBYvM7e09Dk9p9O+SuT6dnbtAr4 hiYrzwLZv3n32jtlr3TVJCbY05ZtUlvvXOf6nnjA= From: Hamza Mahfooz To: linux-security-module@vger.kernel.org, io-uring@vger.kernel.org Cc: Hamza Mahfooz , Jens Axboe , Pavel Begunkov , linux-kernel@vger.kernel.org Subject: [PATCH 2/2] io_uring: use security_uring_allowed() Date: Thu, 19 Dec 2024 16:16:07 -0500 Message-ID: <20241219211610.83638-2-hamzamahfooz@linux.microsoft.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241219211610.83638-1-hamzamahfooz@linux.microsoft.com> References: <20241219211610.83638-1-hamzamahfooz@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 To make use of the new LSM hook, call security_uring_allowed() from io_uring_allowed() and while we are at it return error codes from io_uring_allowed() instead of true/false. Cc: Jens Axboe Signed-off-by: Hamza Mahfooz --- io_uring/io_uring.c | 21 ++++++++++++++------- 1 file changed, 14 insertions(+), 7 deletions(-) diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index 06ff41484e29..0922bb0724c0 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -3806,29 +3806,36 @@ static long io_uring_setup(u32 entries, struct io_uring_params __user *params) return io_uring_create(entries, &p, params); } -static inline bool io_uring_allowed(void) +static inline int io_uring_allowed(void) { int disabled = READ_ONCE(sysctl_io_uring_disabled); kgid_t io_uring_group; if (disabled == 2) - return false; + return -EPERM; if (disabled == 0 || capable(CAP_SYS_ADMIN)) - return true; + goto allowed_lsm; io_uring_group = make_kgid(&init_user_ns, sysctl_io_uring_group); if (!gid_valid(io_uring_group)) - return false; + return -EPERM; + + if (!in_group_p(io_uring_group)) + return -EPERM; - return in_group_p(io_uring_group); +allowed_lsm: + return security_uring_allowed(); } SYSCALL_DEFINE2(io_uring_setup, u32, entries, struct io_uring_params __user *, params) { - if (!io_uring_allowed()) - return -EPERM; + int ret; + + ret = io_uring_allowed(); + if (ret) + return ret; return io_uring_setup(entries, params); }