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[173.164.112.133]) by smtp.gmail.com with ESMTPSA id a2-v6sm17051135pgc.68.2018.10.01.17.55.12 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 01 Oct 2018 17:55:13 -0700 (PDT) From: Kees Cook To: James Morris Cc: Kees Cook , Casey Schaufler , John Johansen , Tetsuo Handa , Paul Moore , Stephen Smalley , "Schaufler, Casey" , LSM , Jonathan Corbet , linux-doc@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH security-next v4 09/32] LSM: Provide init debugging infrastructure Date: Mon, 1 Oct 2018 17:54:42 -0700 Message-Id: <20181002005505.6112-10-keescook@chromium.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181002005505.6112-1-keescook@chromium.org> References: <20181002005505.6112-1-keescook@chromium.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Booting with "lsm.debug" will report future details on how LSM ordering decisions are being made. Signed-off-by: Kees Cook Reviewed-by: Casey Schaufler Reviewed-by: John Johansen --- .../admin-guide/kernel-parameters.txt | 2 ++ security/security.c | 18 ++++++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 9871e649ffef..32d323ee9218 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -2274,6 +2274,8 @@ ltpc= [NET] Format: ,, + lsm.debug [SECURITY] Enable LSM initialization debugging output. + machvec= [IA-64] Force the use of a particular machine-vector (machvec) in a generic kernel. Example: machvec=hpzx1_swiotlb diff --git a/security/security.c b/security/security.c index e74f46fba591..395f804f6a91 100644 --- a/security/security.c +++ b/security/security.c @@ -12,6 +12,8 @@ * (at your option) any later version. */ +#define pr_fmt(fmt) "LSM: " fmt + #include #include #include @@ -43,11 +45,19 @@ char *lsm_names; static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1] = CONFIG_DEFAULT_SECURITY; +static __initdata bool debug; +#define init_debug(...) \ + do { \ + if (debug) \ + pr_info(__VA_ARGS__); \ + } while (0) + static void __init major_lsm_init(void) { struct lsm_info *lsm; for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { + init_debug("initializing %s\n", lsm->name); lsm->init(); } } @@ -91,6 +101,14 @@ static int __init choose_lsm(char *str) } __setup("security=", choose_lsm); +/* Enable LSM order debugging. */ +static int __init enable_debug(char *str) +{ + debug = true; + return 1; +} +__setup("lsm.debug", enable_debug); + static bool match_last_lsm(const char *list, const char *lsm) { const char *last; -- 2.17.1