1 files changed, 127 insertions, 41 deletions

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index ae40ac8c39e7..1bd8827a0102 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -85,6 +85,9 @@ extern int audit_enabled;
 /* Indicates that audit should log the full pathname. */
 #define AUDIT_NAME_FULL -1
 
+/* number of audit rules */
+int audit_n_rules;
+
 /* When fs/namei.c:getname() is called, we store the pointer in name and
  * we don't let putname() free it (instead we free all of the saved
  * pointers at syscall exit time).
@@ -174,6 +177,7 @@ struct audit_aux_data_path {
 
 /* The per-task audit context. */
 struct audit_context {
+        int                 dummy;      /* must be the first element */
         int                 in_syscall; /* 1 if task is in a syscall */
         enum audit_state    state;
         unsigned int        serial;     /* serial number for record */
@@ -205,6 +209,54 @@ struct audit_context {
 #endif
 };
 
+#define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
+static inline int open_arg(int flags, int mask)
+{
+        int n = ACC_MODE(flags);
+        if (flags & (O_TRUNC | O_CREAT))
+                n |= AUDIT_PERM_WRITE;
+        return n & mask;
+}
+
+static int audit_match_perm(struct audit_context *ctx, int mask)
+{
+        unsigned n = ctx->major;
+        switch (audit_classify_syscall(ctx->arch, n)) {
+        case 0: /* native */
+                if ((mask & AUDIT_PERM_WRITE) &&
+                     audit_match_class(AUDIT_CLASS_WRITE, n))
+                        return 1;
+                if ((mask & AUDIT_PERM_READ) &&
+                     audit_match_class(AUDIT_CLASS_READ, n))
+                        return 1;
+                if ((mask & AUDIT_PERM_ATTR) &&
+                     audit_match_class(AUDIT_CLASS_CHATTR, n))
+                        return 1;
+                return 0;
+        case 1: /* 32bit on biarch */
+                if ((mask & AUDIT_PERM_WRITE) &&
+                     audit_match_class(AUDIT_CLASS_WRITE_32, n))
+                        return 1;
+                if ((mask & AUDIT_PERM_READ) &&
+                     audit_match_class(AUDIT_CLASS_READ_32, n))
+                        return 1;
+                if ((mask & AUDIT_PERM_ATTR) &&
+                     audit_match_class(AUDIT_CLASS_CHATTR_32, n))
+                        return 1;
+                return 0;
+        case 2: /* open */
+                return mask & ACC_MODE(ctx->argv[1]);
+        case 3: /* openat */
+                return mask & ACC_MODE(ctx->argv[2]);
+        case 4: /* socketcall */
+                return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND);
+        case 5: /* execve */
+                return mask & AUDIT_PERM_EXEC;
+        default:
+                return 0;
+        }
+}
+
 /* Determine if any context name data matches a rule's watch data */
 /* Compare a task_struct with an audit_rule.  Return 1 on match, 0
  * otherwise. */
@@ -393,6 +445,9 @@ static int audit_filter_rules(struct task_struct *tsk,
                         /* ignore this field for filtering */
                         result = 1;
                         break;
+                case AUDIT_PERM:
+                        result = audit_match_perm(ctx, f->val);
+                        break;
                 }
 
                 if (!result)
@@ -514,7 +569,7 @@ static inline struct audit_context *audit_get_context(struct task_struct *tsk,
         context->return_valid = return_valid;
         context->return_code  = return_code;
 
-        if (context->in_syscall && !context->auditable) {
+        if (context->in_syscall && !context->dummy && !context->auditable) {
                 enum audit_state state;
 
                 state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]);
@@ -530,17 +585,7 @@ static inline struct audit_context *audit_get_context(struct task_struct *tsk,
         }
 
 get_context:
-        context->pid = tsk->pid;
-        context->ppid = sys_getppid();  /* sic.  tsk == current in all cases */
-        context->uid = tsk->uid;
-        context->gid = tsk->gid;
-        context->euid = tsk->euid;
-        context->suid = tsk->suid;
-        context->fsuid = tsk->fsuid;
-        context->egid = tsk->egid;
-        context->sgid = tsk->sgid;
-        context->fsgid = tsk->fsgid;
-        context->personality = tsk->personality;
+
         tsk->audit_context = NULL;
         return context;
 }
@@ -749,6 +794,17 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
         const char *tty;
 
         /* tsk == current */
+        context->pid = tsk->pid;
+        context->ppid = sys_getppid();  /* sic.  tsk == current in all cases */
+        context->uid = tsk->uid;
+        context->gid = tsk->gid;
+        context->euid = tsk->euid;
+        context->suid = tsk->suid;
+        context->fsuid = tsk->fsuid;
+        context->egid = tsk->egid;
+        context->sgid = tsk->sgid;
+        context->fsgid = tsk->fsgid;
+        context->personality = tsk->personality;
 
         ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL);
         if (!ab)
@@ -1066,7 +1122,8 @@ void audit_syscall_entry(int arch, int major,
         context->argv[3]    = a4;
 
         state = context->state;
-        if (state == AUDIT_SETUP_CONTEXT || state == AUDIT_BUILD_CONTEXT)
+        context->dummy = !audit_n_rules;
+        if (!context->dummy && (state == AUDIT_SETUP_CONTEXT || state == AUDIT_BUILD_CONTEXT))
                 state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]);
         if (likely(state == AUDIT_DISABLED))
                 return;
@@ -1199,14 +1256,18 @@ void audit_putname(const char *name)
 #endif
 }
 
-static void audit_inode_context(int idx, const struct inode *inode)
+/* Copy inode data into an audit_names. */
+static void audit_copy_inode(struct audit_names *name, const struct inode *inode)
 {
-        struct audit_context *context = current->audit_context;
-
-        selinux_get_inode_sid(inode, &context->names[idx].osid);
+        name->ino   = inode->i_ino;
+        name->dev   = inode->i_sb->s_dev;
+        name->mode  = inode->i_mode;
+        name->uid   = inode->i_uid;
+        name->gid   = inode->i_gid;
+        name->rdev  = inode->i_rdev;
+        selinux_get_inode_sid(inode, &name->osid);
 }
 
-
 /**
  * audit_inode - store the inode and device from a lookup
  * @name: name being audited
@@ -1240,20 +1301,14 @@ void __audit_inode(const char *name, const struct inode *inode)
                 ++context->ino_count;
 #endif
         }
-        context->names[idx].ino   = inode->i_ino;
-        context->names[idx].dev   = inode->i_sb->s_dev;
-        context->names[idx].mode  = inode->i_mode;
-        context->names[idx].uid   = inode->i_uid;
-        context->names[idx].gid   = inode->i_gid;
-        context->names[idx].rdev  = inode->i_rdev;
-        audit_inode_context(idx, inode);
+        audit_copy_inode(&context->names[idx], inode);
 }
 
 /**
  * audit_inode_child - collect inode info for created/removed objects
  * @dname: inode's dentry name
  * @inode: inode being audited
- * @pino: inode number of dentry parent
+ * @parent: inode of dentry parent
  *
  * For syscalls that create or remove filesystem objects, audit_inode
  * can only collect information for the filesystem object's parent.
@@ -1264,7 +1319,7 @@ void __audit_inode(const char *name, const struct inode *inode)
  * unsuccessful attempts.
  */
 void __audit_inode_child(const char *dname, const struct inode *inode,
-                         unsigned long pino)
+                         const struct inode *parent)
 {
         int idx;
         struct audit_context *context = current->audit_context;
@@ -1278,7 +1333,7 @@ void __audit_inode_child(const char *dname, const struct inode *inode,
         if (!dname)
                 goto update_context;
         for (idx = 0; idx < context->name_count; idx++)
-                if (context->names[idx].ino == pino) {
+                if (context->names[idx].ino == parent->i_ino) {
                         const char *name = context->names[idx].name;
 
                         if (!name)
@@ -1302,16 +1357,47 @@ update_context:
         context->names[idx].name_len = AUDIT_NAME_FULL;
         context->names[idx].name_put = 0;       /* don't call __putname() */
 
-        if (inode) {
-                context->names[idx].ino   = inode->i_ino;
-                context->names[idx].dev   = inode->i_sb->s_dev;
-                context->names[idx].mode  = inode->i_mode;
-                context->names[idx].uid   = inode->i_uid;
-                context->names[idx].gid   = inode->i_gid;
-                context->names[idx].rdev  = inode->i_rdev;
-                audit_inode_context(idx, inode);
-        } else
-                context->names[idx].ino   = (unsigned long)-1;
+        if (!inode)
+                context->names[idx].ino = (unsigned long)-1;
+        else
+                audit_copy_inode(&context->names[idx], inode);
+
+        /* A parent was not found in audit_names, so copy the inode data for the
+         * provided parent. */
+        if (!found_name) {
+                idx = context->name_count++;
+#if AUDIT_DEBUG
+                context->ino_count++;
+#endif
+                audit_copy_inode(&context->names[idx], parent);
+        }
+}
+
+/**
+ * audit_inode_update - update inode info for last collected name
+ * @inode: inode being audited
+ *
+ * When open() is called on an existing object with the O_CREAT flag, the inode
+ * data audit initially collects is incorrect.  This additional hook ensures
+ * audit has the inode data for the actual object to be opened.
+ */
+void __audit_inode_update(const struct inode *inode)
+{
+        struct audit_context *context = current->audit_context;
+        int idx;
+
+        if (!context->in_syscall || !inode)
+                return;
+
+        if (context->name_count == 0) {
+                context->name_count++;
+#if AUDIT_DEBUG
+                context->ino_count++;
+#endif
+        }
+        idx = context->name_count - 1;
+
+        audit_copy_inode(&context->names[idx], inode);
 }
 
 /**
@@ -1642,7 +1728,7 @@ int audit_bprm(struct linux_binprm *bprm)
         unsigned long p, next;
         void *to;
 
-        if (likely(!audit_enabled || !context))
+        if (likely(!audit_enabled || !context || context->dummy))
                 return 0;
 
         ax = kmalloc(sizeof(*ax) + PAGE_SIZE * MAX_ARG_PAGES - bprm->p,
@@ -1680,7 +1766,7 @@ int audit_socketcall(int nargs, unsigned long *args)
         struct audit_aux_data_socketcall *ax;
         struct audit_context *context = current->audit_context;
 
-        if (likely(!context))
+        if (likely(!context || context->dummy))
                 return 0;
 
         ax = kmalloc(sizeof(*ax) + nargs * sizeof(unsigned long), GFP_KERNEL);
@@ -1708,7 +1794,7 @@ int audit_sockaddr(int len, void *a)
         struct audit_aux_data_sockaddr *ax;
         struct audit_context *context = current->audit_context;
 
-        if (likely(!context))
+        if (likely(!context || context->dummy))
                 return 0;
 
         ax = kmalloc(sizeof(*ax) + len, GFP_KERNEL);