[PATCH] auditing ptrace

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

3 files changed, 42 insertions, 0 deletions

diff --git a/include/linux/audit.h b/include/linux/audit.h
index 773e30df11ee..f93ce78cecbb 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -91,6 +91,7 @@
 #define AUDIT_MQ_GETSETATTR     1315    /* POSIX MQ get/set attribute record type */
 #define AUDIT_KERNEL_OTHER      1316    /* For use by 3rd party modules */
 #define AUDIT_FD_PAIR           1317    /* audit record for pipe/socketpair */
+#define AUDIT_OBJ_PID           1318    /* ptrace target */
 
 #define AUDIT_AVC               1400    /* SE Linux avc denial or grant */
 #define AUDIT_SELINUX_ERR       1401    /* Internal SE Linux Errors */
@@ -352,6 +353,8 @@ extern void __audit_inode(const char *name, const struct inode *inode);
 extern void __audit_inode_child(const char *dname, const struct inode *inode,
                                 const struct inode *parent);
 extern void __audit_inode_update(const struct inode *inode);
+extern void __audit_ptrace(struct task_struct *t);
+
 static inline int audit_dummy_context(void)
 {
         void *p = current->audit_context;
@@ -377,6 +380,12 @@ static inline void audit_inode_update(const struct inode *inode) {
                 __audit_inode_update(inode);
 }
 
+static inline void audit_ptrace(struct task_struct *t)
+{
+        if (unlikely(!audit_dummy_context()))
+                __audit_ptrace(t);
+}
+
                                 /* Private API (for audit.c only) */
 extern unsigned int audit_serial(void);
 extern void auditsc_get_stamp(struct audit_context *ctx,
@@ -477,6 +486,7 @@ extern int audit_n_rules;
 #define audit_mq_timedreceive(d,l,p,t) ({ 0; })
 #define audit_mq_notify(d,n) ({ 0; })
 #define audit_mq_getsetattr(d,s) ({ 0; })
+#define audit_ptrace(t) ((void)0)
 #define audit_n_rules 0
 #endif
 
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 628c7ac590a0..2243c559bc03 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -209,6 +209,9 @@ struct audit_context {
         unsigned long       personality;
         int                 arch;
 
+        pid_t               target_pid;
+        u32                 target_sid;
+
 #if AUDIT_DEBUG
         int                 put_count;
         int                 ino_count;
@@ -973,6 +976,23 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
                 audit_log_end(ab);
         }
 
+        if (context->target_pid) {
+                ab =audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID);
+                if (ab) {
+                        char *s = NULL, *t;
+                        u32 len;
+                        if (selinux_sid_to_string(context->target_sid,
+                                                    &s, &len))
+                                t = "(none)";
+                        else
+                                t = s;
+                        audit_log_format(ab, "opid=%d obj=%s",
+                                        context->target_pid, t);
+                        audit_log_end(ab);
+                        kfree(s);
+                }
+        }
+
         if (context->pwd && context->pwdmnt) {
                 ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD);
                 if (ab) {
@@ -1193,6 +1213,7 @@ void audit_syscall_exit(int valid, long return_code)
         } else {
                 audit_free_names(context);
                 audit_free_aux(context);
+                context->target_pid = 0;
                 kfree(context->filterkey);
                 context->filterkey = NULL;
                 tsk->audit_context = context;
@@ -1880,6 +1901,14 @@ int audit_sockaddr(int len, void *a)
         return 0;
 }
 
+void __audit_ptrace(struct task_struct *t)
+{
+        struct audit_context *context = current->audit_context;
+
+        context->target_pid = t->pid;
+        selinux_get_task_sid(t, &context->target_sid);
+}
+
 /**
  * audit_avc_path - record the granting or denial of permissions
  * @dentry: dentry to record
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 4d50e06fd745..ad7949a589dd 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -18,6 +18,7 @@
 #include <linux/ptrace.h>
 #include <linux/security.h>
 #include <linux/signal.h>
+#include <linux/audit.h>
 
 #include <asm/pgtable.h>
 #include <asm/uaccess.h>
@@ -161,6 +162,8 @@ int ptrace_attach(struct task_struct *task)
 {
         int retval;
 
+        audit_ptrace(task);
+
         retval = -EPERM;
         if (task->pid <= 1)
                 goto out;