And the same phrase goes to James Morris...
If you are sure that it is safe to use get_task_comm() from
dump_common_audit_data() and you prefer locked version, please pick up below
patch via your git tree.
If you are unsure or prefer lockless version, I'll make a lockless version
using do_get_task_comm() proposed in this thread.
----------
>From 1fe3dcd8792bc1296e337daba661200a8feaf706 Mon Sep 17 00:00:00 2001
From: Tetsuo Handa <penguin-ker...@i-love.sakura.ne.jp>
Date: Tue, 11 Mar 2014 21:09:48 +0900
Subject: [PATCH] LSM: Pass comm name via get_task_comm()
When we pass task->comm to audit_log_untrustedstring(), we need to pass
a snapshot of it using get_task_comm(). Otherwise, we will lose fields
after comm= if we raced with updating task->comm.
Signed-off-by: Tetsuo Handa <penguin-ker...@i-love.sakura.ne.jp>
---
security/lsm_audit.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/security/lsm_audit.c b/security/lsm_audit.c
index 9a62045..6291c67 100644
--- a/security/lsm_audit.c
+++ b/security/lsm_audit.c
@@ -212,6 +212,7 @@ static void dump_common_audit_data(struct audit_buffer *ab,
struct common_audit_data *a)
{
struct task_struct *tsk = current;
+ char name[TASK_COMM_LEN];
/*
* To keep stack sizes in check force programers to notice if they
@@ -221,7 +222,7 @@ static void dump_common_audit_data(struct audit_buffer *ab,
BUILD_BUG_ON(sizeof(a->u) > sizeof(void *)*2);
audit_log_format(ab, " pid=%d comm=", tsk->pid);
- audit_log_untrustedstring(ab, tsk->comm);
+ audit_log_untrustedstring(ab, get_task_comm(name, tsk));
switch (a->type) {
case LSM_AUDIT_DATA_NONE:
@@ -280,7 +281,7 @@ static void dump_common_audit_data(struct audit_buffer *ab,
tsk = a->u.tsk;
if (tsk && tsk->pid) {
audit_log_format(ab, " pid=%d comm=", tsk->pid);
- audit_log_untrustedstring(ab, tsk->comm);
+ audit_log_untrustedstring(ab, get_task_comm(name, tsk));
}
break;
case LSM_AUDIT_DATA_NET:
--
1.7.9.5
--
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