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LSM: Provide init debugging infrastructure

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Booting with "lsm.debug" will report future details on how LSM ordering
decisions are being made.

Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: John Johansen <john.johansen@canonical.com>
Reviewed-by: James Morris <james.morris@microsoft.com>
Signed-off-by: James Morris <james.morris@microsoft.com>
This commit is contained in:
Kees Cook 2018-10-10 17:18:25 -07:00 committed by James Morris
parent 07aed2f2af
commit 9b8c7c1405
2 changed files with 20 additions and 0 deletions
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2
Documentation/admin-guide/kernel-parameters.txt
View File

@ -2274,6 +2274,8 @@
ltpc= [NET] ltpc= [NET]
Format: <io>,<irq>,<dma> Format: <io>,<irq>,<dma>
lsm.debug [SECURITY] Enable LSM initialization debugging output.
machvec= [IA-64] Force the use of a particular machine-vector machvec= [IA-64] Force the use of a particular machine-vector
(machvec) in a generic kernel. (machvec) in a generic kernel.
Example: machvec=hpzx1_swiotlb Example: machvec=hpzx1_swiotlb

18
security/security.c
View File

@ -12,6 +12,8 @@
* (at your option) any later version. * (at your option) any later version.
*/ */
#define pr_fmt(fmt) "LSM: " fmt
#include <linux/bpf.h> #include <linux/bpf.h>
#include <linux/capability.h> #include <linux/capability.h>
#include <linux/dcache.h> #include <linux/dcache.h>
@ -43,11 +45,19 @@ char *lsm_names;
static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1] = static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1] =
CONFIG_DEFAULT_SECURITY; 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) static void __init major_lsm_init(void)
{ {
struct lsm_info *lsm; struct lsm_info *lsm;
for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
init_debug("initializing %s\n", lsm->name);
lsm->init(); lsm->init();
} }
} }
@ -91,6 +101,14 @@ static int __init choose_lsm(char *str)
} }
__setup("security=", choose_lsm); __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) static bool match_last_lsm(const char *list, const char *lsm)
{ {
const char *last; const char *last;