Re: [PATCH] audit: get comm using lock to avoid race in string printing

--- kernel/audit.c | 5 ++--- kernel/auditsc.c | 9 +++++---- 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/kernel/audit.c b/kernel/audit.c index 9239e5e..5b600c8 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -1883,7 +1883,7 @@ EXPORT_SYMBOL(audit_log_task_context); void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) { const struct cred *cred; - char name[sizeof(tsk->comm)]; + char comm[sizeof(tsk->comm)]; struct mm_struct *mm = tsk->mm; char *tty; @@ -1917,9 +1917,8 @@ void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) from_kgid(&init_user_ns, cred->fsgid), tty, audit_get_sessionid(tsk)); - get_task_comm(name, tsk); audit_log_format(ab, " comm="); - audit_log_untrustedstring(ab, name); + audit_log_untrustedstring(ab, get_task_comm(name, tsk)); if (mm) { down_read(&mm->mmap_sem); diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 8fffca8..b789e0c 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -2289,7 +2289,7 @@ void __audit_ptrace(struct task_struct *t) context->target_uid = task_uid(t); context->target_sessionid = audit_get_sessionid(t); security_task_getsecid(t, &context->target_sid); - memcpy(context->target_comm, t->comm, TASK_COMM_LEN); + get_task_comm(context->target_comm, t); } /** @@ -2328,7 +2328,7 @@ int __audit_signal_info(int sig, struct task_struct *t) ctx->target_uid = t_uid; ctx->target_sessionid = audit_get_sessionid(t); security_task_getsecid(t, &ctx->target_sid); - memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN); + get_task_comm(ctx->target_comm, t); return 0; } @@ -2349,7 +2349,7 @@ int __audit_signal_info(int sig, struct task_struct *t) axp->target_uid[axp->pid_count] = t_uid; axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t); security_task_getsecid(t, &axp->target_sid[axp->pid_count]); - memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN); + get_task_comm(axp->target_comm[axp->pid_count], t); axp->pid_count++; return 0; @@ -2435,6 +2435,7 @@ static void audit_log_task(struct audit_buffer *ab) kgid_t gid; unsigned int sessionid; struct mm_struct *mm = current->mm; + char comm[sizeof(current->comm)]; auid = audit_get_loginuid(current); sessionid = audit_get_sessionid(current); @@ -2447,7 +2448,7 @@ static void audit_log_task(struct audit_buffer *ab) sessionid); audit_log_task_context(ab); audit_log_format(ab, " pid=%d comm=", task_pid_nr(current)); - audit_log_untrustedstring(ab, current->comm); + audit_log_untrustedstring(ab, get_task_comm(comm, current); if (mm) { down_read(&mm->mmap_sem); if (mm->exe_file)