[PATCH 1/3] kernel/audit: consolidate handling of mm->exe_file

Davidlohr Bueso
2015-02-19T00:11:49Z

From: Davidlohr Bueso <dave@stgolabs.net>

This patch adds a audit_log_d_path_exe() helper function
to share how we handle auditing of the exe_file's path.
Used by both audit and auditsc. No functionality is changed.

Cc: Paul Moore <paul@paul-moore.com>
Cc: Eric Paris <eparis@redhat.com>
Cc: linux-audit@redhat.com
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
---

Compile tested only.

kernel/audit.c | 9 +--------
kernel/audit.h | 14 ++++++++++++++
kernel/auditsc.c | 9 +--------
3 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/kernel/audit.c b/kernel/audit.c
index 72ab759..9b49f76 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1842,7 +1842,6 @@ void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
{
const struct cred *cred;
char comm[sizeof(tsk->comm)];
- struct mm_struct *mm = tsk->mm;
char *tty;

if (!ab)
@@ -1878,13 +1877,7 @@ void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
audit_log_format(ab, " comm=");
audit_log_untrustedstring(ab, get_task_comm(comm, tsk));

- if (mm) {
- down_read(&mm->mmap_sem);
- if (mm->exe_file)
- audit_log_d_path(ab, " exe=", &mm->exe_file->f_path);
- up_read(&mm->mmap_sem);
- } else
- audit_log_format(ab, " exe=(null)");
+ audit_log_d_path_exe(ab, tsk->mm);
audit_log_task_context(ab);
}
EXPORT_SYMBOL(audit_log_task_info);
diff --git a/kernel/audit.h b/kernel/audit.h
index 1caa0d3..510901f 100644
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -257,6 +257,20 @@ extern struct list_head audit_filter_list[];

extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);

+static inline void audit_log_d_path_exe(struct audit_buffer *ab,
+ struct mm_struct *mm)
+{
+ if (!mm) {
+ audit_log_format(ab, " exe=(null)");
+ return;
+ }
+
+ down_read(&mm->mmap_sem);
+ if (mm->exe_file)
+ audit_log_d_path(ab, " exe=", &mm->exe_file->f_path);
+ up_read(&mm->mmap_sem);
+}
+
/* audit watch functions */
#ifdef CONFIG_AUDIT_WATCH
extern void audit_put_watch(struct audit_watch *watch);
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index dc4ae70..84c74d0 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -2361,7 +2361,6 @@ static void audit_log_task(struct audit_buffer *ab)
kuid_t auid, uid;
kgid_t gid;
unsigned int sessionid;
- struct mm_struct *mm = current->mm;
char comm[sizeof(current->comm)];

auid = audit_get_loginuid(current);
@@ -2376,13 +2375,7 @@ static void audit_log_task(struct audit_buffer *ab)
audit_log_task_context(ab);
audit_log_format(ab, " pid=%d comm=", task_pid_nr(current));
audit_log_untrustedstring(ab, get_task_comm(comm, current));
- if (mm) {
- down_read(&mm->mmap_sem);
- if (mm->exe_file)
- audit_log_d_path(ab, " exe=", &mm->exe_file->f_path);
- up_read(&mm->mmap_sem);
- } else
- audit_log_format(ab, " exe=(null)");
+ audit_log_d_path_exe(ab, current->mm);
}

/**
--
2.1.4