From 21b85c31d23f2047d47e1f74bfa5caa8b75c1c77 Mon Sep 17 00:00:00 2001 From: Eric Paris Date: Thu, 23 May 2013 14:26:00 -0400 Subject: audit: audit feature to set loginuid immutable This adds a new 'audit_feature' bit which allows userspace to set it such that the loginuid is absolutely immutable, even if you have CAP_AUDIT_CONTROL. Signed-off-by: Eric Paris Signed-off-by: Richard Guy Briggs Signed-off-by: Eric Paris --- kernel/audit.c | 3 ++- kernel/auditsc.c | 3 +++ 2 files changed, 5 insertions(+), 1 deletion(-) (limited to 'kernel') diff --git a/kernel/audit.c b/kernel/audit.c index fbfa3a7..f3f36f5 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -144,8 +144,9 @@ static struct audit_features af = {.vers = AUDIT_FEATURE_VERSION, .features = 0, .lock = 0,}; -static char *audit_feature_names[1] = { +static char *audit_feature_names[2] = { "only_unset_loginuid", + "loginuid_immutable", }; diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 924c0bf..63223d6 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -1971,6 +1971,9 @@ static int audit_set_loginuid_perm(kuid_t loginuid) /* if we are unset, we don't need privs */ if (!audit_loginuid_set(current)) return 0; + /* if AUDIT_FEATURE_LOGINUID_IMMUTABLE means never ever allow a change*/ + if (is_audit_feature_set(AUDIT_FEATURE_LOGINUID_IMMUTABLE)) + return -EPERM; /* it is set, you need permission */ if (!capable(CAP_AUDIT_CONTROL)) return -EPERM; -- cgit v1.1