diff options
| author | Kees Cook <keescook@chromium.org> | 2018-09-19 19:57:06 -0700 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2019-01-08 13:18:43 -0800 |
| commit | 14bd99c821f7ace0e8110a1bfdfaa27e1788e20f (patch) | |
| tree | a5feee1ff6b832eaffef89d1bde995e0574723e2 /security/security.c | |
| parent | 7e611486d905f435faf80969deed68a615019e6b (diff) | |
| download | linux-14bd99c821f7ace0e8110a1bfdfaa27e1788e20f.tar.bz2 | |
LSM: Separate idea of "major" LSM from "exclusive" LSM
In order to both support old "security=" Legacy Major LSM selection, and
handling real exclusivity, this creates LSM_FLAG_EXCLUSIVE and updates
the selection logic to handle them.
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Casey Schaufler <casey@schaufler-ca.com>
Diffstat (limited to 'security/security.c')
| -rw-r--r-- | security/security.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/security/security.c b/security/security.c index 88de6b073246..a8dd7defe30a 100644 --- a/security/security.c +++ b/security/security.c @@ -49,6 +49,7 @@ static __initconst const char * const builtin_lsm_order = CONFIG_LSM; /* Ordered list of LSMs to initialize. */ static __initdata struct lsm_info **ordered_lsms; +static __initdata struct lsm_info *exclusive; static __initdata bool debug; #define init_debug(...) \ @@ -129,6 +130,12 @@ static bool __init lsm_allowed(struct lsm_info *lsm) if (!is_enabled(lsm)) return false; + /* Not allowed if another exclusive LSM already initialized. */ + if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && exclusive) { + init_debug("exclusive disabled: %s\n", lsm->name); + return false; + } + return true; } @@ -144,6 +151,11 @@ static void __init maybe_initialize_lsm(struct lsm_info *lsm) if (enabled) { int ret; + if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && !exclusive) { + exclusive = lsm; + init_debug("exclusive chosen: %s\n", lsm->name); + } + init_debug("initializing %s\n", lsm->name); ret = lsm->init(); WARN(ret, "%s failed to initialize: %d\n", lsm->name, ret); |