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Date: Mon, 21 Dec 2020 11:55:39 -0500
From: Richard Guy Briggs <rgb@...hat.com>
To: Linux Containers List <containers@...ts.linux-foundation.org>,
Linux API <linux-api@...r.kernel.org>,
Linux-Audit Mailing List <linux-audit@...hat.com>,
Linux FSdevel <linux-fsdevel@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Linux NetDev Upstream Mailing List <netdev@...r.kernel.org>,
Netfilter Devel List <netfilter-devel@...r.kernel.org>
Cc: Neil Horman <nhorman@...driver.com>,
David Howells <dhowells@...hat.com>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Simo Sorce <simo@...hat.com>,
Eric Paris <eparis@...isplace.org>, mpatel@...hat.com,
Serge Hallyn <serge@...lyn.com>,
Kees Cook <keescook@...omium.org>,
Jens Axboe <axboe@...nel.dk>,
Christian Brauner <christian.brauner@...ntu.com>,
Richard Guy Briggs <rgb@...hat.com>
Subject: [PATCH ghak90 v10 05/11] audit: add support for non-syscall auxiliary records
Standalone audit records have the timestamp and serial number generated
on the fly and as such are unique, making them standalone. This new
function audit_alloc_local() generates a local audit context that will
be used only for a standalone record and its auxiliary record(s). The
context is discarded immediately after the local associated records are
produced.
A new flag, "local" was used rather than "in_syscall" since it would be
overloading the original purpose and meaning. Events using this
function may not be triggered by a syscall but still need records
linked by timestamp and serial.
Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
Acked-by: Serge Hallyn <serge@...lyn.com>
Acked-by: Neil Horman <nhorman@...driver.com>
Reviewed-by: Ondrej Mosnacek <omosnace@...hat.com>
---
include/linux/audit.h | 8 ++++++++
kernel/audit.h | 1 +
kernel/auditsc.c | 31 ++++++++++++++++++++++++++-----
3 files changed, 35 insertions(+), 5 deletions(-)
diff --git a/include/linux/audit.h b/include/linux/audit.h
index 7c1928e75cfe..9f0238f7960f 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -304,6 +304,8 @@ static inline int audit_signal_info(int sig, struct task_struct *t)
/* These are defined in auditsc.c */
/* Public API */
+extern struct audit_context *audit_alloc_local(gfp_t gfpflags);
+extern void audit_free_context(struct audit_context *context);
extern void __audit_syscall_entry(int major, unsigned long a0, unsigned long a1,
unsigned long a2, unsigned long a3);
extern void __audit_syscall_exit(int ret_success, long ret_value);
@@ -555,6 +557,12 @@ static inline void audit_log_nfcfg(const char *name, u8 af,
extern int audit_n_rules;
extern int audit_signals;
#else /* CONFIG_AUDITSYSCALL */
+static inline struct audit_context *audit_alloc_local(gfp_t gfpflags)
+{
+ return NULL;
+}
+static inline void audit_free_context(struct audit_context *context)
+{ }
static inline void audit_syscall_entry(int major, unsigned long a0,
unsigned long a1, unsigned long a2,
unsigned long a3)
diff --git a/kernel/audit.h b/kernel/audit.h
index de79f59d623f..40e609787a0c 100644
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -98,6 +98,7 @@ struct audit_proctitle {
struct audit_context {
int dummy; /* must be the first element */
int in_syscall; /* 1 if task is in a syscall */
+ bool local; /* local context needed */
enum audit_state state, current_state;
unsigned int serial; /* serial number for record */
int major; /* syscall number */
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index eecc7b2e29a7..df26d0aa5e6d 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -920,11 +920,12 @@ static inline void audit_free_aux(struct audit_context *context)
}
}
-static inline struct audit_context *audit_alloc_context(enum audit_state state)
+static inline struct audit_context *audit_alloc_context(enum audit_state state,
+ gfp_t gfpflags)
{
struct audit_context *context;
- context = kzalloc(sizeof(*context), GFP_KERNEL);
+ context = kzalloc(sizeof(*context), gfpflags);
if (!context)
return NULL;
context->state = state;
@@ -962,7 +963,8 @@ int audit_alloc_syscall(struct task_struct *tsk)
return 0;
}
- if (!(context = audit_alloc_context(state))) {
+ context = audit_alloc_context(state, GFP_KERNEL);
+ if (!context) {
kfree(key);
audit_log_lost("out of memory in audit_alloc_syscall");
return -ENOMEM;
@@ -974,8 +976,26 @@ int audit_alloc_syscall(struct task_struct *tsk)
return 0;
}
-static inline void audit_free_context(struct audit_context *context)
+struct audit_context *audit_alloc_local(gfp_t gfpflags)
{
+ struct audit_context *context;
+
+ context = audit_alloc_context(AUDIT_RECORD_CONTEXT, gfpflags);
+ if (!context) {
+ audit_log_lost("out of memory in audit_alloc_local");
+ return NULL;
+ }
+ context->serial = audit_serial();
+ ktime_get_coarse_real_ts64(&context->ctime);
+ context->local = true;
+ return context;
+}
+EXPORT_SYMBOL(audit_alloc_local);
+
+void audit_free_context(struct audit_context *context)
+{
+ if (!context)
+ return;
audit_free_module(context);
audit_free_names(context);
unroll_tree_refs(context, NULL, 0);
@@ -986,6 +1006,7 @@ static inline void audit_free_context(struct audit_context *context)
audit_proctitle_free(context);
kfree(context);
}
+EXPORT_SYMBOL(audit_free_context);
static int audit_log_pid_context(struct audit_context *context, pid_t pid,
kuid_t auid, kuid_t uid, unsigned int sessionid,
@@ -2223,7 +2244,7 @@ EXPORT_SYMBOL_GPL(__audit_inode_child);
int auditsc_get_stamp(struct audit_context *ctx,
struct timespec64 *t, unsigned int *serial)
{
- if (!ctx->in_syscall)
+ if (!ctx->in_syscall && !ctx->local)
return 0;
if (!ctx->serial)
ctx->serial = audit_serial();
--
2.18.4
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