| Message ID | 20230921061641.273654-5-mic@digikod.net (mailing list archive) |
|---|---|
| State | RFC |
| Delegated to: | Paul Moore |
| Headers | show |
| Series | Landlock audit support | expand |
On Thu, Sep 21, 2023 at 2:17 AM Mickaël Salaün <mic@digikod.net> wrote: > > Add audit support for domain creation, i.e. task self-restriction. > > Signed-off-by: Mickaël Salaün <mic@digikod.net> > --- > security/landlock/audit.c | 24 ++++++++++++++++++++++++ > security/landlock/audit.h | 8 ++++++++ > security/landlock/syscalls.c | 4 ++++ > 3 files changed, 36 insertions(+) > > diff --git a/security/landlock/audit.c b/security/landlock/audit.c > index f58bd529784a..d9589d07e126 100644 > --- a/security/landlock/audit.c > +++ b/security/landlock/audit.c > @@ -84,6 +84,30 @@ void landlock_log_create_ruleset(struct landlock_ruleset *const ruleset) > audit_log_end(ab); > } > > +void landlock_log_restrict_self(struct landlock_ruleset *const domain, > + struct landlock_ruleset *const ruleset) > +{ > + struct audit_buffer *ab; > + > + WARN_ON_ONCE(domain->id); > + WARN_ON_ONCE(!ruleset->id); > + > + ab = audit_log_start(audit_context(), GFP_ATOMIC, AUDIT_LANDLOCK); > + if (!ab) > + /* audit_log_lost() call */ > + return; > + > + domain->hierarchy->id = > + atomic64_inc_return(&ruleset_and_domain_counter); > + log_task(ab); > + audit_log_format(ab, " op=restrict-self domain=%llu ruleset=%llu", > + domain->hierarchy->id, ruleset->id); If domain creation and self restriction are the same, I would suggest going with "op=create-domain" so it better matches "op=release-domain" in patch 3/7. Also see my previous comment about consistency between AUDIT_LANDLOCK records. > + audit_log_format( > + ab, " parent=%llu", > + domain->hierarchy->parent ? domain->hierarchy->parent->id : 0); > + audit_log_end(ab); > +} -- paul-moore.com
On Wed, Dec 20, 2023 at 04:22:22PM -0500, Paul Moore wrote: > On Thu, Sep 21, 2023 at 2:17 AM Mickaël Salaün <mic@digikod.net> wrote: > > > > Add audit support for domain creation, i.e. task self-restriction. > > > > Signed-off-by: Mickaël Salaün <mic@digikod.net> > > --- > > security/landlock/audit.c | 24 ++++++++++++++++++++++++ > > security/landlock/audit.h | 8 ++++++++ > > security/landlock/syscalls.c | 4 ++++ > > 3 files changed, 36 insertions(+) > > > > diff --git a/security/landlock/audit.c b/security/landlock/audit.c > > index f58bd529784a..d9589d07e126 100644 > > --- a/security/landlock/audit.c > > +++ b/security/landlock/audit.c > > @@ -84,6 +84,30 @@ void landlock_log_create_ruleset(struct landlock_ruleset *const ruleset) > > audit_log_end(ab); > > } > > > > +void landlock_log_restrict_self(struct landlock_ruleset *const domain, > > + struct landlock_ruleset *const ruleset) > > +{ > > + struct audit_buffer *ab; > > + > > + WARN_ON_ONCE(domain->id); > > + WARN_ON_ONCE(!ruleset->id); > > + > > + ab = audit_log_start(audit_context(), GFP_ATOMIC, AUDIT_LANDLOCK); > > + if (!ab) > > + /* audit_log_lost() call */ > > + return; > > + > > + domain->hierarchy->id = > > + atomic64_inc_return(&ruleset_and_domain_counter); > > + log_task(ab); > > + audit_log_format(ab, " op=restrict-self domain=%llu ruleset=%llu", > > + domain->hierarchy->id, ruleset->id); > > If domain creation and self restriction are the same, I would suggest > going with "op=create-domain" so it better matches "op=release-domain" > in patch 3/7. OK, I'll do something more consistent. > > Also see my previous comment about consistency between AUDIT_LANDLOCK records. > > > + audit_log_format( > > + ab, " parent=%llu", > > + domain->hierarchy->parent ? domain->hierarchy->parent->id : 0); > > + audit_log_end(ab); > > +} > > -- > paul-moore.com >
diff --git a/security/landlock/audit.c b/security/landlock/audit.c index f58bd529784a..d9589d07e126 100644 --- a/security/landlock/audit.c +++ b/security/landlock/audit.c @@ -84,6 +84,30 @@ void landlock_log_create_ruleset(struct landlock_ruleset *const ruleset) audit_log_end(ab); } +void landlock_log_restrict_self(struct landlock_ruleset *const domain, + struct landlock_ruleset *const ruleset) +{ + struct audit_buffer *ab; + + WARN_ON_ONCE(domain->id); + WARN_ON_ONCE(!ruleset->id); + + ab = audit_log_start(audit_context(), GFP_ATOMIC, AUDIT_LANDLOCK); + if (!ab) + /* audit_log_lost() call */ + return; + + domain->hierarchy->id = + atomic64_inc_return(&ruleset_and_domain_counter); + log_task(ab); + audit_log_format(ab, " op=restrict-self domain=%llu ruleset=%llu", + domain->hierarchy->id, ruleset->id); + audit_log_format( + ab, " parent=%llu", + domain->hierarchy->parent ? domain->hierarchy->parent->id : 0); + audit_log_end(ab); +} + /* * This is useful to know when a domain or a ruleset will never show again in * the audit log. diff --git a/security/landlock/audit.h b/security/landlock/audit.h index 2666e9151627..bc17dc8ca6f1 100644 --- a/security/landlock/audit.h +++ b/security/landlock/audit.h @@ -16,6 +16,8 @@ #ifdef CONFIG_AUDIT void landlock_log_create_ruleset(struct landlock_ruleset *const ruleset); +void landlock_log_restrict_self(struct landlock_ruleset *const domain, + struct landlock_ruleset *const ruleset); void landlock_log_release_ruleset(const struct landlock_ruleset *const ruleset); #else /* CONFIG_AUDIT */ @@ -25,6 +27,12 @@ landlock_log_create_ruleset(struct landlock_ruleset *const ruleset) { } +static inline void +landlock_log_restrict_self(struct landlock_ruleset *const domain, + struct landlock_ruleset *const ruleset) +{ +} + static inline void landlock_log_release_ruleset(const struct landlock_ruleset *const ruleset) { diff --git a/security/landlock/syscalls.c b/security/landlock/syscalls.c index 373997a356e7..bfe5417a06c3 100644 --- a/security/landlock/syscalls.c +++ b/security/landlock/syscalls.c @@ -452,6 +452,10 @@ SYSCALL_DEFINE2(landlock_restrict_self, const int, ruleset_fd, const __u32, landlock_put_ruleset(new_llcred->domain); new_llcred->domain = new_dom; + // FIXME: Must be atomic between the ruleset merge and the audit log to + // be sure about the content of the domain. + // -> move mutex_lock() from merge_ruleset() into this function + landlock_log_restrict_self(new_dom, ruleset); landlock_put_ruleset(ruleset); return commit_creds(new_cred);
Add audit support for domain creation, i.e. task self-restriction. Signed-off-by: Mickaël Salaün <mic@digikod.net> --- security/landlock/audit.c | 24 ++++++++++++++++++++++++ security/landlock/audit.h | 8 ++++++++ security/landlock/syscalls.c | 4 ++++ 3 files changed, 36 insertions(+)