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-rw-r--r--fs/namei.c29
-rw-r--r--include/linux/audit.h3
-rw-r--r--include/linux/fs.h9
-rw-r--r--kernel/audit.h17
-rw-r--r--kernel/auditsc.c105
5 files changed, 29 insertions, 134 deletions
diff --git a/fs/namei.c b/fs/namei.c
index a3fde77d4abf..96ca11dea4a2 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -118,15 +118,6 @@
* POSIX.1 2.4: an empty pathname is invalid (ENOENT).
* PATH_MAX includes the nul terminator --RR.
*/
-void final_putname(struct filename *name)
-{
- if (name->separate) {
- __putname(name->name);
- kfree(name);
- } else {
- __putname(name);
- }
-}
#define EMBEDDED_NAME_MAX (PATH_MAX - sizeof(struct filename))
@@ -145,6 +136,7 @@ getname_flags(const char __user *filename, int flags, int *empty)
result = __getname();
if (unlikely(!result))
return ERR_PTR(-ENOMEM);
+ result->refcnt = 1;
/*
* First, try to embed the struct filename inside the names_cache
@@ -179,6 +171,7 @@ recopy:
}
result->name = kname;
result->separate = true;
+ result->refcnt = 1;
max = PATH_MAX;
goto recopy;
}
@@ -202,7 +195,7 @@ recopy:
return result;
error:
- final_putname(result);
+ putname(result);
return err;
}
@@ -243,19 +236,25 @@ getname_kernel(const char * filename)
memcpy((char *)result->name, filename, len);
result->uptr = NULL;
result->aname = NULL;
+ result->refcnt = 1;
audit_getname(result);
return result;
}
-#ifdef CONFIG_AUDITSYSCALL
void putname(struct filename *name)
{
- if (unlikely(!audit_dummy_context()))
- return audit_putname(name);
- final_putname(name);
+ BUG_ON(name->refcnt <= 0);
+
+ if (--name->refcnt > 0)
+ return;
+
+ if (name->separate) {
+ __putname(name->name);
+ kfree(name);
+ } else
+ __putname(name);
}
-#endif
static int check_acl(struct inode *inode, int mask)
{
diff --git a/include/linux/audit.h b/include/linux/audit.h
index af84234e1f6e..87c2d347d255 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -128,7 +128,6 @@ extern void __audit_syscall_entry(int major, unsigned long a0, unsigned long a1,
extern void __audit_syscall_exit(int ret_success, long ret_value);
extern struct filename *__audit_reusename(const __user char *uptr);
extern void __audit_getname(struct filename *name);
-extern void audit_putname(struct filename *name);
#define AUDIT_INODE_PARENT 1 /* dentry represents the parent */
#define AUDIT_INODE_HIDDEN 2 /* audit record should be hidden */
@@ -353,8 +352,6 @@ static inline struct filename *audit_reusename(const __user char *name)
}
static inline void audit_getname(struct filename *name)
{ }
-static inline void audit_putname(struct filename *name)
-{ }
static inline void __audit_inode(struct filename *name,
const struct dentry *dentry,
unsigned int flags)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index f90c0282c114..b49842fe203f 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2080,6 +2080,7 @@ struct filename {
const char *name; /* pointer to actual string */
const __user char *uptr; /* original userland pointer */
struct audit_names *aname;
+ int refcnt;
bool separate; /* should "name" be freed? */
};
@@ -2101,6 +2102,7 @@ extern int filp_close(struct file *, fl_owner_t id);
extern struct filename *getname_flags(const char __user *, int, int *);
extern struct filename *getname(const char __user *);
extern struct filename *getname_kernel(const char *);
+extern void putname(struct filename *name);
enum {
FILE_CREATED = 1,
@@ -2121,15 +2123,8 @@ extern void __init vfs_caches_init(unsigned long);
extern struct kmem_cache *names_cachep;
-extern void final_putname(struct filename *name);
-
#define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL)
#define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
-#ifndef CONFIG_AUDITSYSCALL
-#define putname(name) final_putname(name)
-#else
-extern void putname(struct filename *name);
-#endif
#ifdef CONFIG_BLOCK
extern int register_blkdev(unsigned int, const char *);
diff --git a/kernel/audit.h b/kernel/audit.h
index 3cdffad5a1d9..1caa0d345d90 100644
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -24,12 +24,6 @@
#include <linux/skbuff.h>
#include <uapi/linux/mqueue.h>
-/* 0 = no checking
- 1 = put_count checking
- 2 = verbose put_count checking
-*/
-#define AUDIT_DEBUG 0
-
/* AUDIT_NAMES is the number of slots we reserve in the audit_context
* for saving names from getname(). If we get more names we will allocate
* a name dynamically and also add those to the list anchored by names_list. */
@@ -74,9 +68,8 @@ struct audit_cap_data {
};
};
-/* 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).
+/* When fs/namei.c:getname() is called, we store the pointer in name and bump
+ * the refcnt in the associated filename struct.
*
* Further, in fs/namei.c:path_lookup() we store the inode and device.
*/
@@ -86,7 +79,6 @@ struct audit_names {
struct filename *name;
int name_len; /* number of chars to log */
bool hidden; /* don't log this record */
- bool name_put; /* call __putname()? */
unsigned long ino;
dev_t dev;
@@ -208,11 +200,6 @@ struct audit_context {
};
int fds[2];
struct audit_proctitle proctitle;
-
-#if AUDIT_DEBUG
- int put_count;
- int ino_count;
-#endif
};
extern u32 audit_ever_enabled;
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 4f521964ccaa..0c38604a630c 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -866,33 +866,10 @@ static inline void audit_free_names(struct audit_context *context)
{
struct audit_names *n, *next;
-#if AUDIT_DEBUG == 2
- if (context->put_count + context->ino_count != context->name_count) {
- int i = 0;
-
- pr_err("%s:%d(:%d): major=%d in_syscall=%d"
- " name_count=%d put_count=%d ino_count=%d"
- " [NOT freeing]\n", __FILE__, __LINE__,
- context->serial, context->major, context->in_syscall,
- context->name_count, context->put_count,
- context->ino_count);
- list_for_each_entry(n, &context->names_list, list) {
- pr_err("names[%d] = %p = %s\n", i++, n->name,
- n->name->name ?: "(null)");
- }
- dump_stack();
- return;
- }
-#endif
-#if AUDIT_DEBUG
- context->put_count = 0;
- context->ino_count = 0;
-#endif
-
list_for_each_entry_safe(n, next, &context->names_list, list) {
list_del(&n->list);
- if (n->name && n->name_put)
- final_putname(n->name);
+ if (n->name)
+ putname(n->name);
if (n->should_free)
kfree(n);
}
@@ -1711,9 +1688,6 @@ static struct audit_names *audit_alloc_name(struct audit_context *context,
list_add_tail(&aname->list, &context->names_list);
context->name_count++;
-#if AUDIT_DEBUG
- context->ino_count++;
-#endif
return aname;
}
@@ -1734,8 +1708,10 @@ __audit_reusename(const __user char *uptr)
list_for_each_entry(n, &context->names_list, list) {
if (!n->name)
continue;
- if (n->name->uptr == uptr)
+ if (n->name->uptr == uptr) {
+ n->name->refcnt++;
return n->name;
+ }
}
return NULL;
}
@@ -1752,19 +1728,8 @@ void __audit_getname(struct filename *name)
struct audit_context *context = current->audit_context;
struct audit_names *n;
- if (!context->in_syscall) {
-#if AUDIT_DEBUG == 2
- pr_err("%s:%d(:%d): ignoring getname(%p)\n",
- __FILE__, __LINE__, context->serial, name);
- dump_stack();
-#endif
+ if (!context->in_syscall)
return;
- }
-
-#if AUDIT_DEBUG
- /* The filename _must_ have a populated ->name */
- BUG_ON(!name->name);
-#endif
n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
if (!n)
@@ -1772,56 +1737,13 @@ void __audit_getname(struct filename *name)
n->name = name;
n->name_len = AUDIT_NAME_FULL;
- n->name_put = true;
name->aname = n;
+ name->refcnt++;
if (!context->pwd.dentry)
get_fs_pwd(current->fs, &context->pwd);
}
-/* audit_putname - intercept a putname request
- * @name: name to intercept and delay for putname
- *
- * If we have stored the name from getname in the audit context,
- * then we delay the putname until syscall exit.
- * Called from include/linux/fs.h:putname().
- */
-void audit_putname(struct filename *name)
-{
- struct audit_context *context = current->audit_context;
-
- BUG_ON(!context);
- if (!name->aname || !context->in_syscall) {
-#if AUDIT_DEBUG == 2
- pr_err("%s:%d(:%d): final_putname(%p)\n",
- __FILE__, __LINE__, context->serial, name);
- if (context->name_count) {
- struct audit_names *n;
- int i = 0;
-
- list_for_each_entry(n, &context->names_list, list)
- pr_err("name[%d] = %p = %s\n", i++, n->name,
- n->name->name ?: "(null)");
- }
-#endif
- final_putname(name);
- }
-#if AUDIT_DEBUG
- else {
- ++context->put_count;
- if (context->put_count > context->name_count) {
- pr_err("%s:%d(:%d): major=%d in_syscall=%d putname(%p)"
- " name_count=%d put_count=%d\n",
- __FILE__, __LINE__,
- context->serial, context->major,
- context->in_syscall, name->name,
- context->name_count, context->put_count);
- dump_stack();
- }
- }
-#endif
-}
-
/**
* __audit_inode - store the inode and device from a lookup
* @name: name being audited
@@ -1842,11 +1764,6 @@ void __audit_inode(struct filename *name, const struct dentry *dentry,
if (!name)
goto out_alloc;
-#if AUDIT_DEBUG
- /* The struct filename _must_ have a populated ->name */
- BUG_ON(!name->name);
-#endif
-
/*
* If we have a pointer to an audit_names entry already, then we can
* just use it directly if the type is correct.
@@ -1893,9 +1810,10 @@ out_alloc:
n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
if (!n)
return;
- if (name)
- /* no need to set ->name_put as the original will cleanup */
+ if (name) {
n->name = name;
+ name->refcnt++;
+ }
out:
if (parent) {
@@ -2000,8 +1918,7 @@ void __audit_inode_child(const struct inode *parent,
if (found_parent) {
found_child->name = found_parent->name;
found_child->name_len = AUDIT_NAME_FULL;
- /* don't call __putname() */
- found_child->name_put = false;
+ found_child->name->refcnt++;
}
}