[PATCH security-next v4 09/32] LSM: Provide init debugging infrastructure
From: Kees Cook <hidden>
Date: 2018-10-02 00:55:26
Also in:
linux-arch, linux-doc, lkml
Subsystem:
documentation, security subsystem, the rest · Maintainers:
Jonathan Corbet, Paul Moore, James Morris, "Serge E. Hallyn", Linus Torvalds
Booting with "lsm.debug" will report future details on how LSM ordering decisions are being made. Signed-off-by: Kees Cook <redacted> Reviewed-by: Casey Schaufler <casey@schaufler-ca.com> Reviewed-by: John Johansen <john.johansen@canonical.com> --- .../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: <io>,<irq>,<dma> + 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 <linux/bpf.h> #include <linux/capability.h> #include <linux/dcache.h>
@@ -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