From patchwork Thu Dec 12 17:42:20 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Micka=C3=ABl_Sala=C3=BCn?= X-Patchwork-Id: 13905737 Received: from smtp-1908.mail.infomaniak.ch (smtp-1908.mail.infomaniak.ch [185.125.25.8]) (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 E568E22333B for ; Thu, 12 Dec 2024 17:42:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.125.25.8 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734025377; cv=none; b=E7Rqjuypf4/l8kplFLqYIh62Rtw/090R+PbO+IbxAknYudeH9Chg4THQwPFJgWgzCRAQKc2LISJJ7cqT4vPvghk9pCKeXiztVate9u6mvjceMld3uPwehoJLWBy0qrZ/Z7eERniXC5bimvtZ17oR70nUWQ3D99932zG/GOfH0K0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734025377; c=relaxed/simple; bh=JRWYVcMH5s897bnNdcaAdJ2sQRGzDoHCkFj5fUhC+NE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=eTCfqoDbGrIk7yf44HVzhu9neiFIzQ7wCr837RjMc3VvRUcl0o+7lfhydPwQh/Ze5uWN0FuI4A9USvtpKyE94nx1j36eT7hm2PMfVyvPEOEqCsMBP+8/UY3EsZ1KoLI14CD7oFnAin5h0zO5yBPsdVVtlvhpB7pfL9KNIyqk52A= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=digikod.net; spf=pass smtp.mailfrom=digikod.net; dkim=pass (1024-bit key) header.d=digikod.net header.i=@digikod.net header.b=G7AgHd0M; arc=none smtp.client-ip=185.125.25.8 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=digikod.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=digikod.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=digikod.net header.i=@digikod.net header.b="G7AgHd0M" Received: from smtp-3-0000.mail.infomaniak.ch (unknown [IPv6:2001:1600:4:17::246b]) by smtp-3-3000.mail.infomaniak.ch (Postfix) with ESMTPS id 4Y8KYc6fDdz78r; Thu, 12 Dec 2024 18:42:44 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=digikod.net; s=20191114; t=1734025364; bh=6ybjqrej/Df/o67JLMrP/Nkc9gTh6BXP3ChFpaKk0Lc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=G7AgHd0MArq1o4ES0c2/ByE0dSKPLvk0l3QkqlKnlqsi9fg4acLYqBEw8ZSi0qbpF ddw9PARiJH4jJ0rGtKK5BY6QL3x+Phg0VimgvNaEXxcWLcfgL9iJhtDYMzVSNqYjZp 1G7rajDpTNMs0C1JqXg3L/rYayU1NXVbPRCVwqMM= Received: from unknown by smtp-3-0000.mail.infomaniak.ch (Postfix) with ESMTPA id 4Y8KYb4QnTz59W; Thu, 12 Dec 2024 18:42:43 +0100 (CET) From: =?utf-8?q?Micka=C3=ABl_Sala=C3=BCn?= To: Al Viro , Christian Brauner , Kees Cook , Paul Moore , Serge Hallyn Cc: =?utf-8?q?Micka=C3=ABl_Sala=C3=BCn?= , Adhemerval Zanella Netto , Alejandro Colomar , Aleksa Sarai , Andrew Morton , Andy Lutomirski , Arnd Bergmann , Casey Schaufler , Christian Heimes , Dmitry Vyukov , Elliott Hughes , Eric Biggers , Eric Chiang , Fan Wu , Florian Weimer , Geert Uytterhoeven , James Morris , Jan Kara , Jann Horn , Jeff Xu , Jonathan Corbet , Jordan R Abrahams , Lakshmi Ramasubramanian , Linus Torvalds , Luca Boccassi , Luis Chamberlain , "Madhavan T . Venkataraman" , Matt Bobrowski , Matthew Garrett , Matthew Wilcox , Miklos Szeredi , Mimi Zohar , Nicolas Bouchinet , Roberto Sassu , Scott Shell , Shuah Khan , Shuah Khan , Stephen Rothwell , Steve Dower , Steve Grubb , Theodore Ts'o , Thibaut Sautereau , Vincent Strubel , Xiaoming Ni , kernel-hardening@lists.openwall.com, linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH v23 5/8] samples/check-exec: Add set-exec Date: Thu, 12 Dec 2024 18:42:20 +0100 Message-ID: <20241212174223.389435-6-mic@digikod.net> In-Reply-To: <20241212174223.389435-1-mic@digikod.net> References: <20241212174223.389435-1-mic@digikod.net> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Infomaniak-Routing: alpha Add a simple tool to set SECBIT_EXEC_RESTRICT_FILE or SECBIT_EXEC_DENY_INTERACTIVE before executing a command. This is useful to easily test against enlighten script interpreters. Cc: Al Viro Cc: Christian Brauner Cc: Kees Cook Cc: Paul Moore Cc: Serge Hallyn Signed-off-by: Mickaël Salaün Link: https://lore.kernel.org/r/20241212174223.389435-6-mic@digikod.net --- Changes since v19: * Rename file and directory. * Update securebits and related arguments. * Remove useless call to prctl() when securebits are unchanged. --- samples/Kconfig | 7 +++ samples/Makefile | 1 + samples/check-exec/.gitignore | 1 + samples/check-exec/Makefile | 14 ++++++ samples/check-exec/set-exec.c | 85 +++++++++++++++++++++++++++++++++++ 5 files changed, 108 insertions(+) create mode 100644 samples/check-exec/.gitignore create mode 100644 samples/check-exec/Makefile create mode 100644 samples/check-exec/set-exec.c diff --git a/samples/Kconfig b/samples/Kconfig index b288d9991d27..efa28ceadc42 100644 --- a/samples/Kconfig +++ b/samples/Kconfig @@ -291,6 +291,13 @@ config SAMPLE_CGROUP help Build samples that demonstrate the usage of the cgroup API. +config SAMPLE_CHECK_EXEC + bool "Exec secure bits examples" + depends on CC_CAN_LINK && HEADERS_INSTALL + help + Build a tool to easily configure SECBIT_EXEC_RESTRICT_FILE and + SECBIT_EXEC_DENY_INTERACTIVE. + source "samples/rust/Kconfig" endif # SAMPLES diff --git a/samples/Makefile b/samples/Makefile index b85fa64390c5..f988202f3a30 100644 --- a/samples/Makefile +++ b/samples/Makefile @@ -3,6 +3,7 @@ subdir-$(CONFIG_SAMPLE_AUXDISPLAY) += auxdisplay subdir-$(CONFIG_SAMPLE_ANDROID_BINDERFS) += binderfs +subdir-$(CONFIG_SAMPLE_CHECK_EXEC) += check-exec subdir-$(CONFIG_SAMPLE_CGROUP) += cgroup obj-$(CONFIG_SAMPLE_CONFIGFS) += configfs/ obj-$(CONFIG_SAMPLE_CONNECTOR) += connector/ diff --git a/samples/check-exec/.gitignore b/samples/check-exec/.gitignore new file mode 100644 index 000000000000..3f8119112ccf --- /dev/null +++ b/samples/check-exec/.gitignore @@ -0,0 +1 @@ +/set-exec diff --git a/samples/check-exec/Makefile b/samples/check-exec/Makefile new file mode 100644 index 000000000000..d9f976e3ff98 --- /dev/null +++ b/samples/check-exec/Makefile @@ -0,0 +1,14 @@ +# SPDX-License-Identifier: BSD-3-Clause + +userprogs-always-y := \ + set-exec + +userccflags += -I usr/include + +.PHONY: all clean + +all: + $(MAKE) -C ../.. samples/check-exec/ + +clean: + $(MAKE) -C ../.. M=samples/check-exec/ clean diff --git a/samples/check-exec/set-exec.c b/samples/check-exec/set-exec.c new file mode 100644 index 000000000000..ba86a60a20dd --- /dev/null +++ b/samples/check-exec/set-exec.c @@ -0,0 +1,85 @@ +// SPDX-License-Identifier: BSD-3-Clause +/* + * Simple tool to set SECBIT_EXEC_RESTRICT_FILE, SECBIT_EXEC_DENY_INTERACTIVE, + * before executing a command. + * + * Copyright © 2024 Microsoft Corporation + */ + +#define _GNU_SOURCE +#define __SANE_USERSPACE_TYPES__ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static void print_usage(const char *argv0) +{ + fprintf(stderr, "usage: %s -f|-i -- [args]...\n\n", argv0); + fprintf(stderr, "Execute a command with\n"); + fprintf(stderr, "- SECBIT_EXEC_RESTRICT_FILE set: -f\n"); + fprintf(stderr, "- SECBIT_EXEC_DENY_INTERACTIVE set: -i\n"); +} + +int main(const int argc, char *const argv[], char *const *const envp) +{ + const char *cmd_path; + char *const *cmd_argv; + int opt, secbits_cur, secbits_new; + bool has_policy = false; + + secbits_cur = prctl(PR_GET_SECUREBITS); + if (secbits_cur == -1) { + /* + * This should never happen, except with a buggy seccomp + * filter. + */ + perror("ERROR: Failed to get securebits"); + return 1; + } + + secbits_new = secbits_cur; + while ((opt = getopt(argc, argv, "fi")) != -1) { + switch (opt) { + case 'f': + secbits_new |= SECBIT_EXEC_RESTRICT_FILE | + SECBIT_EXEC_RESTRICT_FILE_LOCKED; + has_policy = true; + break; + case 'i': + secbits_new |= SECBIT_EXEC_DENY_INTERACTIVE | + SECBIT_EXEC_DENY_INTERACTIVE_LOCKED; + has_policy = true; + break; + default: + print_usage(argv[0]); + return 1; + } + } + + if (!argv[optind] || !has_policy) { + print_usage(argv[0]); + return 1; + } + + if (secbits_cur != secbits_new && + prctl(PR_SET_SECUREBITS, secbits_new)) { + perror("Failed to set secure bit(s)."); + fprintf(stderr, + "Hint: The running kernel may not support this feature.\n"); + return 1; + } + + cmd_path = argv[optind]; + cmd_argv = argv + optind; + fprintf(stderr, "Executing command...\n"); + execvpe(cmd_path, cmd_argv, envp); + fprintf(stderr, "Failed to execute \"%s\": %s\n", cmd_path, + strerror(errno)); + return 1; +}