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mm/kmemleak.c
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/* * mm/kmemleak.c * * Copyright (C) 2008 ARM Limited * Written by Catalin Marinas <catalin.marinas@arm.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * * For more information on the algorithm and kmemleak usage, please see |
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* Documentation/dev-tools/kmemleak.rst. |
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* * Notes on locking * ---------------- * * The following locks and mutexes are used by kmemleak: * * - kmemleak_lock (rwlock): protects the object_list modifications and * accesses to the object_tree_root. The object_list is the main list * holding the metadata (struct kmemleak_object) for the allocated memory |
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* blocks. The object_tree_root is a red black tree used to look-up |
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* metadata based on a pointer to the corresponding memory block. The * kmemleak_object structures are added to the object_list and * object_tree_root in the create_object() function called from the * kmemleak_alloc() callback and removed in delete_object() called from the * kmemleak_free() callback * - kmemleak_object.lock (spinlock): protects a kmemleak_object. Accesses to * the metadata (e.g. count) are protected by this lock. Note that some * members of this structure may be protected by other means (atomic or * kmemleak_lock). This lock is also held when scanning the corresponding * memory block to avoid the kernel freeing it via the kmemleak_free() * callback. This is less heavyweight than holding a global lock like * kmemleak_lock during scanning * - scan_mutex (mutex): ensures that only one thread may scan the memory for * unreferenced objects at a time. The gray_list contains the objects which * are already referenced or marked as false positives and need to be * scanned. This list is only modified during a scanning episode when the * scan_mutex is held. At the end of a scan, the gray_list is always empty. * Note that the kmemleak_object.use_count is incremented when an object is |
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* added to the gray_list and therefore cannot be freed. This mutex also * prevents multiple users of the "kmemleak" debugfs file together with * modifications to the memory scanning parameters including the scan_thread * pointer |
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* |
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* Locks and mutexes are acquired/nested in the following order: |
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* |
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* scan_mutex [-> object->lock] -> kmemleak_lock -> other_object->lock (SINGLE_DEPTH_NESTING) * * No kmemleak_lock and object->lock nesting is allowed outside scan_mutex * regions. |
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* |
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* The kmemleak_object structures have a use_count incremented or decremented * using the get_object()/put_object() functions. When the use_count becomes * 0, this count can no longer be incremented and put_object() schedules the * kmemleak_object freeing via an RCU callback. All calls to the get_object() * function must be protected by rcu_read_lock() to avoid accessing a freed * structure. */ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/init.h> #include <linux/kernel.h> #include <linux/list.h> |
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#include <linux/sched/signal.h> |
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#include <linux/sched/task.h> |
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#include <linux/sched/task_stack.h> |
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#include <linux/jiffies.h> #include <linux/delay.h> |
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#include <linux/export.h> |
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#include <linux/kthread.h> |
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#include <linux/rbtree.h> |
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#include <linux/fs.h> #include <linux/debugfs.h> #include <linux/seq_file.h> #include <linux/cpumask.h> #include <linux/spinlock.h> #include <linux/mutex.h> #include <linux/rcupdate.h> #include <linux/stacktrace.h> #include <linux/cache.h> #include <linux/percpu.h> #include <linux/hardirq.h> |
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#include <linux/bootmem.h> #include <linux/pfn.h> |
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#include <linux/mmzone.h> #include <linux/slab.h> #include <linux/thread_info.h> #include <linux/err.h> #include <linux/uaccess.h> #include <linux/string.h> #include <linux/nodemask.h> #include <linux/mm.h> |
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#include <linux/workqueue.h> |
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#include <linux/crc32.h> |
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#include <asm/sections.h> #include <asm/processor.h> |
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#include <linux/atomic.h> |
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|
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#include <linux/kasan.h> |
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#include <linux/kmemleak.h> |
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#include <linux/memory_hotplug.h> |
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/* * Kmemleak configuration and common defines. */ #define MAX_TRACE 16 /* stack trace length */ |
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#define MSECS_MIN_AGE 5000 /* minimum object age for reporting */ |
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#define SECS_FIRST_SCAN 60 /* delay before the first scan */ #define SECS_SCAN_WAIT 600 /* subsequent auto scanning delay */ |
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#define MAX_SCAN_SIZE 4096 /* maximum size of a scanned block */ |
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#define BYTES_PER_POINTER sizeof(void *) |
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/* GFP bitmask for kmemleak internal allocations */ |
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#define gfp_kmemleak_mask(gfp) (((gfp) & (GFP_KERNEL | GFP_ATOMIC)) | \ |
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__GFP_NORETRY | __GFP_NOMEMALLOC | \ __GFP_NOWARN) |
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/* scanning area inside a memory block */ struct kmemleak_scan_area { struct hlist_node node; |
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unsigned long start; size_t size; |
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}; |
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#define KMEMLEAK_GREY 0 #define KMEMLEAK_BLACK -1 |
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/* * Structure holding the metadata for each allocated memory block. * Modifications to such objects should be made while holding the * object->lock. Insertions or deletions from object_list, gray_list or |
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* rb_node are already protected by the corresponding locks or mutex (see |
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* the notes on locking above). These objects are reference-counted * (use_count) and freed using the RCU mechanism. */ struct kmemleak_object { spinlock_t lock; |
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unsigned int flags; /* object status flags */ |
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struct list_head object_list; struct list_head gray_list; |
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struct rb_node rb_node; |
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struct rcu_head rcu; /* object_list lockless traversal */ /* object usage count; object freed when use_count == 0 */ atomic_t use_count; unsigned long pointer; size_t size; |
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/* pass surplus references to this pointer */ unsigned long excess_ref; |
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/* minimum number of a pointers found before it is considered leak */ int min_count; /* the total number of pointers found pointing to this object */ int count; |
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/* checksum for detecting modified objects */ u32 checksum; |
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/* memory ranges to be scanned inside an object (empty for all) */ struct hlist_head area_list; unsigned long trace[MAX_TRACE]; unsigned int trace_len; unsigned long jiffies; /* creation timestamp */ pid_t pid; /* pid of the current task */ char comm[TASK_COMM_LEN]; /* executable name */ }; /* flag representing the memory block allocation status */ #define OBJECT_ALLOCATED (1 << 0) /* flag set after the first reporting of an unreference object */ #define OBJECT_REPORTED (1 << 1) /* flag set to not scan the object */ #define OBJECT_NO_SCAN (1 << 2) |
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/* number of bytes to print per line; must be 16 or 32 */ #define HEX_ROW_SIZE 16 /* number of bytes to print at a time (1, 2, 4, 8) */ #define HEX_GROUP_SIZE 1 /* include ASCII after the hex output */ #define HEX_ASCII 1 /* max number of lines to be printed */ #define HEX_MAX_LINES 2 |
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/* the list of all allocated objects */ static LIST_HEAD(object_list); /* the list of gray-colored objects (see color_gray comment below) */ static LIST_HEAD(gray_list); |
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/* search tree for object boundaries */ static struct rb_root object_tree_root = RB_ROOT; /* rw_lock protecting the access to object_list and object_tree_root */ |
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static DEFINE_RWLOCK(kmemleak_lock); /* allocation caches for kmemleak internal data */ static struct kmem_cache *object_cache; static struct kmem_cache *scan_area_cache; /* set if tracing memory operations is enabled */ |
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static int kmemleak_enabled; |
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/* same as above but only for the kmemleak_free() callback */ static int kmemleak_free_enabled; |
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/* set in the late_initcall if there were no errors */ |
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static int kmemleak_initialized; |
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/* enables or disables early logging of the memory operations */ |
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static int kmemleak_early_log = 1; |
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/* set if a kmemleak warning was issued */ |
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static int kmemleak_warning; |
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/* set if a fatal kmemleak error has occurred */ |
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static int kmemleak_error; |
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/* minimum and maximum address that may be valid pointers */ static unsigned long min_addr = ULONG_MAX; static unsigned long max_addr; |
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static struct task_struct *scan_thread; |
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/* used to avoid reporting of recently allocated objects */ |
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static unsigned long jiffies_min_age; |
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static unsigned long jiffies_last_scan; |
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/* delay between automatic memory scannings */ static signed long jiffies_scan_wait; /* enables or disables the task stacks scanning */ |
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static int kmemleak_stack_scan = 1; |
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/* protects the memory scanning, parameters and debug/kmemleak file access */ |
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static DEFINE_MUTEX(scan_mutex); |
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/* setting kmemleak=on, will set this var, skipping the disable */ static int kmemleak_skip_disable; |
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/* If there are leaks that can be reported */ static bool kmemleak_found_leaks; |
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/* |
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* Early object allocation/freeing logging. Kmemleak is initialized after the |
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* kernel allocator. However, both the kernel allocator and kmemleak may |
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* allocate memory blocks which need to be tracked. Kmemleak defines an |
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* arbitrary buffer to hold the allocation/freeing information before it is * fully initialized. */ /* kmemleak operation type for early logging */ enum { KMEMLEAK_ALLOC, |
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KMEMLEAK_ALLOC_PERCPU, |
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KMEMLEAK_FREE, |
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KMEMLEAK_FREE_PART, |
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KMEMLEAK_FREE_PERCPU, |
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KMEMLEAK_NOT_LEAK, KMEMLEAK_IGNORE, KMEMLEAK_SCAN_AREA, |
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KMEMLEAK_NO_SCAN, KMEMLEAK_SET_EXCESS_REF |
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}; /* * Structure holding the information passed to kmemleak callbacks during the * early logging. */ struct early_log { int op_type; /* kmemleak operation type */ |
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int min_count; /* minimum reference count */ |
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const void *ptr; /* allocated/freed memory block */ |
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union { size_t size; /* memory block size */ unsigned long excess_ref; /* surplus reference passing */ }; |
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unsigned long trace[MAX_TRACE]; /* stack trace */ unsigned int trace_len; /* stack trace length */ |
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}; /* early logging buffer and current position */ |
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static struct early_log early_log[CONFIG_DEBUG_KMEMLEAK_EARLY_LOG_SIZE] __initdata; static int crt_early_log __initdata; |
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static void kmemleak_disable(void); /* * Print a warning and dump the stack trace. */ |
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#define kmemleak_warn(x...) do { \ |
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pr_warn(x); \ |
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dump_stack(); \ |
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kmemleak_warning = 1; \ |
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} while (0) /* |
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* Macro invoked when a serious kmemleak condition occurred and cannot be |
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* recovered from. Kmemleak will be disabled and further allocation/freeing |
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* tracing no longer available. */ |
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#define kmemleak_stop(x...) do { \ |
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kmemleak_warn(x); \ kmemleak_disable(); \ } while (0) /* |
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* Printing of the objects hex dump to the seq file. The number of lines to be * printed is limited to HEX_MAX_LINES to prevent seq file spamming. The * actual number of printed bytes depends on HEX_ROW_SIZE. It must be called * with the object->lock held. */ static void hex_dump_object(struct seq_file *seq, struct kmemleak_object *object) { const u8 *ptr = (const u8 *)object->pointer; |
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size_t len; |
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/* limit the number of lines to HEX_MAX_LINES */ |
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len = min_t(size_t, object->size, HEX_MAX_LINES * HEX_ROW_SIZE); |
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|
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seq_printf(seq, " hex dump (first %zu bytes): ", len); |
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kasan_disable_current(); |
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seq_hex_dump(seq, " ", DUMP_PREFIX_NONE, HEX_ROW_SIZE, HEX_GROUP_SIZE, ptr, len, HEX_ASCII); |
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kasan_enable_current(); |
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} /* |
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* Object colors, encoded with count and min_count: * - white - orphan object, not enough references to it (count < min_count) * - gray - not orphan, not marked as false positive (min_count == 0) or * sufficient references to it (count >= min_count) * - black - ignore, it doesn't contain references (e.g. text section) * (min_count == -1). No function defined for this color. * Newly created objects don't have any color assigned (object->count == -1) * before the next memory scan when they become white. */ |
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static bool color_white(const struct kmemleak_object *object) |
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{ |
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return object->count != KMEMLEAK_BLACK && object->count < object->min_count; |
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} |
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static bool color_gray(const struct kmemleak_object *object) |
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{ |
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return object->min_count != KMEMLEAK_BLACK && object->count >= object->min_count; |
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} /* |
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* Objects are considered unreferenced only if their color is white, they have * not be deleted and have a minimum age to avoid false positives caused by * pointers temporarily stored in CPU registers. */ |
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static bool unreferenced_object(struct kmemleak_object *object) |
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{ |
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return (color_white(object) && object->flags & OBJECT_ALLOCATED) && |
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time_before_eq(object->jiffies + jiffies_min_age, jiffies_last_scan); |
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} /* |
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* Printing of the unreferenced objects information to the seq file. The * print_unreferenced function must be called with the object->lock held. |
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*/ |
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static void print_unreferenced(struct seq_file *seq, struct kmemleak_object *object) { int i; |
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unsigned int msecs_age = jiffies_to_msecs(jiffies - object->jiffies); |
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|
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seq_printf(seq, "unreferenced object 0x%08lx (size %zu): ", object->pointer, object->size); |
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seq_printf(seq, " comm \"%s\", pid %d, jiffies %lu (age %d.%03ds) ", object->comm, object->pid, object->jiffies, msecs_age / 1000, msecs_age % 1000); |
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hex_dump_object(seq, object); |
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seq_printf(seq, " backtrace: "); |
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for (i = 0; i < object->trace_len; i++) { void *ptr = (void *)object->trace[i]; |
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seq_printf(seq, " [<%p>] %pS ", ptr, ptr); |
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} } /* * Print the kmemleak_object information. This function is used mainly for * debugging special cases when kmemleak operations. It must be called with * the object->lock held. */ static void dump_object_info(struct kmemleak_object *object) { struct stack_trace trace; trace.nr_entries = object->trace_len; trace.entries = object->trace; |
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pr_notice("Object 0x%08lx (size %zu): ", |
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object->pointer, object->size); |
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pr_notice(" comm \"%s\", pid %d, jiffies %lu ", object->comm, object->pid, object->jiffies); pr_notice(" min_count = %d ", object->min_count); pr_notice(" count = %d ", object->count); |
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pr_notice(" flags = 0x%x ", object->flags); |
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pr_notice(" checksum = %u ", object->checksum); |
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pr_notice(" backtrace: "); print_stack_trace(&trace, 4); } /* |
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* Look-up a memory block metadata (kmemleak_object) in the object search |
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411 412 413 414 415 416 |
* tree based on a pointer value. If alias is 0, only values pointing to the * beginning of the memory block are allowed. The kmemleak_lock must be held * when calling this function. */ static struct kmemleak_object *lookup_object(unsigned long ptr, int alias) { |
85d3a316c kmemleak: use rbt... |
417 418 419 420 421 422 423 424 425 426 427 428 |
struct rb_node *rb = object_tree_root.rb_node; while (rb) { struct kmemleak_object *object = rb_entry(rb, struct kmemleak_object, rb_node); if (ptr < object->pointer) rb = object->rb_node.rb_left; else if (object->pointer + object->size <= ptr) rb = object->rb_node.rb_right; else if (object->pointer == ptr || alias) return object; else { |
5f79020cb kmemleak: Show wh... |
429 430 431 |
kmemleak_warn("Found object by alias at 0x%08lx ", ptr); |
a7686a45c kmemleak: Show mo... |
432 |
dump_object_info(object); |
85d3a316c kmemleak: use rbt... |
433 |
break; |
3c7b4e6b8 kmemleak: Add the... |
434 |
} |
85d3a316c kmemleak: use rbt... |
435 436 |
} return NULL; |
3c7b4e6b8 kmemleak: Add the... |
437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 |
} /* * Increment the object use_count. Return 1 if successful or 0 otherwise. Note * that once an object's use_count reached 0, the RCU freeing was already * registered and the object should no longer be used. This function must be * called under the protection of rcu_read_lock(). */ static int get_object(struct kmemleak_object *object) { return atomic_inc_not_zero(&object->use_count); } /* * RCU callback to free a kmemleak_object. */ static void free_object_rcu(struct rcu_head *rcu) { |
b67bfe0d4 hlist: drop the n... |
455 |
struct hlist_node *tmp; |
3c7b4e6b8 kmemleak: Add the... |
456 457 458 459 460 461 462 463 |
struct kmemleak_scan_area *area; struct kmemleak_object *object = container_of(rcu, struct kmemleak_object, rcu); /* * Once use_count is 0 (guaranteed by put_object), there is no other * code accessing this object, hence no need for locking. */ |
b67bfe0d4 hlist: drop the n... |
464 465 |
hlist_for_each_entry_safe(area, tmp, &object->area_list, node) { hlist_del(&area->node); |
3c7b4e6b8 kmemleak: Add the... |
466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 |
kmem_cache_free(scan_area_cache, area); } kmem_cache_free(object_cache, object); } /* * Decrement the object use_count. Once the count is 0, free the object using * an RCU callback. Since put_object() may be called via the kmemleak_free() -> * delete_object() path, the delayed RCU freeing ensures that there is no * recursive call to the kernel allocator. Lock-less RCU object_list traversal * is also possible. */ static void put_object(struct kmemleak_object *object) { if (!atomic_dec_and_test(&object->use_count)) return; /* should only get here after delete_object was called */ WARN_ON(object->flags & OBJECT_ALLOCATED); call_rcu(&object->rcu, free_object_rcu); } /* |
85d3a316c kmemleak: use rbt... |
490 |
* Look up an object in the object search tree and increase its use_count. |
3c7b4e6b8 kmemleak: Add the... |
491 492 493 494 |
*/ static struct kmemleak_object *find_and_get_object(unsigned long ptr, int alias) { unsigned long flags; |
9fbed2540 mm/kmemleak.c: re... |
495 |
struct kmemleak_object *object; |
3c7b4e6b8 kmemleak: Add the... |
496 497 498 |
rcu_read_lock(); read_lock_irqsave(&kmemleak_lock, flags); |
93ada579b mm: kmemleak: opt... |
499 |
object = lookup_object(ptr, alias); |
3c7b4e6b8 kmemleak: Add the... |
500 501 502 503 504 505 506 507 508 509 510 |
read_unlock_irqrestore(&kmemleak_lock, flags); /* check whether the object is still available */ if (object && !get_object(object)) object = NULL; rcu_read_unlock(); return object; } /* |
e781a9ab4 mm: kmemleak: fix... |
511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 |
* Look up an object in the object search tree and remove it from both * object_tree_root and object_list. The returned object's use_count should be * at least 1, as initially set by create_object(). */ static struct kmemleak_object *find_and_remove_object(unsigned long ptr, int alias) { unsigned long flags; struct kmemleak_object *object; write_lock_irqsave(&kmemleak_lock, flags); object = lookup_object(ptr, alias); if (object) { rb_erase(&object->rb_node, &object_tree_root); list_del_rcu(&object->object_list); } write_unlock_irqrestore(&kmemleak_lock, flags); return object; } /* |
fd6789675 kmemleak: Save th... |
532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 |
* Save stack trace to the given array of MAX_TRACE size. */ static int __save_stack_trace(unsigned long *trace) { struct stack_trace stack_trace; stack_trace.max_entries = MAX_TRACE; stack_trace.nr_entries = 0; stack_trace.entries = trace; stack_trace.skip = 2; save_stack_trace(&stack_trace); return stack_trace.nr_entries; } /* |
3c7b4e6b8 kmemleak: Add the... |
548 549 550 |
* Create the metadata (struct kmemleak_object) corresponding to an allocated * memory block and add it to the object_list and object_tree_root. */ |
fd6789675 kmemleak: Save th... |
551 552 |
static struct kmemleak_object *create_object(unsigned long ptr, size_t size, int min_count, gfp_t gfp) |
3c7b4e6b8 kmemleak: Add the... |
553 554 |
{ unsigned long flags; |
85d3a316c kmemleak: use rbt... |
555 556 |
struct kmemleak_object *object, *parent; struct rb_node **link, *rb_parent; |
3c7b4e6b8 kmemleak: Add the... |
557 |
|
6ae4bd1f0 kmemleak: Allow k... |
558 |
object = kmem_cache_alloc(object_cache, gfp_kmemleak_mask(gfp)); |
3c7b4e6b8 kmemleak: Add the... |
559 |
if (!object) { |
598d80914 mm: convert pr_wa... |
560 561 |
pr_warn("Cannot allocate a kmemleak_object structure "); |
6ae4bd1f0 kmemleak: Allow k... |
562 |
kmemleak_disable(); |
fd6789675 kmemleak: Save th... |
563 |
return NULL; |
3c7b4e6b8 kmemleak: Add the... |
564 565 566 567 568 569 570 |
} INIT_LIST_HEAD(&object->object_list); INIT_LIST_HEAD(&object->gray_list); INIT_HLIST_HEAD(&object->area_list); spin_lock_init(&object->lock); atomic_set(&object->use_count, 1); |
04609ccc4 kmemleak: Reduce ... |
571 |
object->flags = OBJECT_ALLOCATED; |
3c7b4e6b8 kmemleak: Add the... |
572 573 |
object->pointer = ptr; object->size = size; |
94f4a1618 mm: kmemleak: tre... |
574 |
object->excess_ref = 0; |
3c7b4e6b8 kmemleak: Add the... |
575 |
object->min_count = min_count; |
04609ccc4 kmemleak: Reduce ... |
576 |
object->count = 0; /* white color initially */ |
3c7b4e6b8 kmemleak: Add the... |
577 |
object->jiffies = jiffies; |
04609ccc4 kmemleak: Reduce ... |
578 |
object->checksum = 0; |
3c7b4e6b8 kmemleak: Add the... |
579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 |
/* task information */ if (in_irq()) { object->pid = 0; strncpy(object->comm, "hardirq", sizeof(object->comm)); } else if (in_softirq()) { object->pid = 0; strncpy(object->comm, "softirq", sizeof(object->comm)); } else { object->pid = current->pid; /* * There is a small chance of a race with set_task_comm(), * however using get_task_comm() here may cause locking * dependency issues with current->alloc_lock. In the worst * case, the command line is not correct. */ strncpy(object->comm, current->comm, sizeof(object->comm)); } /* kernel backtrace */ |
fd6789675 kmemleak: Save th... |
599 |
object->trace_len = __save_stack_trace(object->trace); |
3c7b4e6b8 kmemleak: Add the... |
600 |
|
3c7b4e6b8 kmemleak: Add the... |
601 |
write_lock_irqsave(&kmemleak_lock, flags); |
0580a1819 kmemleak: fix spa... |
602 |
|
3c7b4e6b8 kmemleak: Add the... |
603 604 |
min_addr = min(min_addr, ptr); max_addr = max(max_addr, ptr + size); |
85d3a316c kmemleak: use rbt... |
605 606 607 608 609 610 611 612 613 614 |
link = &object_tree_root.rb_node; rb_parent = NULL; while (*link) { rb_parent = *link; parent = rb_entry(rb_parent, struct kmemleak_object, rb_node); if (ptr + size <= parent->pointer) link = &parent->rb_node.rb_left; else if (parent->pointer + parent->size <= ptr) link = &parent->rb_node.rb_right; else { |
756a025f0 mm: coalesce spli... |
615 616 |
kmemleak_stop("Cannot insert 0x%lx into the object search tree (overlaps existing) ", |
85d3a316c kmemleak: use rbt... |
617 |
ptr); |
9d5a4c730 mm: kmemleak: avo... |
618 619 620 621 622 |
/* * No need for parent->lock here since "parent" cannot * be freed while the kmemleak_lock is held. */ dump_object_info(parent); |
85d3a316c kmemleak: use rbt... |
623 |
kmem_cache_free(object_cache, object); |
9d5a4c730 mm: kmemleak: avo... |
624 |
object = NULL; |
85d3a316c kmemleak: use rbt... |
625 626 |
goto out; } |
3c7b4e6b8 kmemleak: Add the... |
627 |
} |
85d3a316c kmemleak: use rbt... |
628 629 |
rb_link_node(&object->rb_node, rb_parent, link); rb_insert_color(&object->rb_node, &object_tree_root); |
3c7b4e6b8 kmemleak: Add the... |
630 631 632 |
list_add_tail_rcu(&object->object_list, &object_list); out: write_unlock_irqrestore(&kmemleak_lock, flags); |
fd6789675 kmemleak: Save th... |
633 |
return object; |
3c7b4e6b8 kmemleak: Add the... |
634 635 636 |
} /* |
e781a9ab4 mm: kmemleak: fix... |
637 |
* Mark the object as not allocated and schedule RCU freeing via put_object(). |
3c7b4e6b8 kmemleak: Add the... |
638 |
*/ |
53238a60d kmemleak: Allow p... |
639 |
static void __delete_object(struct kmemleak_object *object) |
3c7b4e6b8 kmemleak: Add the... |
640 641 |
{ unsigned long flags; |
3c7b4e6b8 kmemleak: Add the... |
642 |
|
3c7b4e6b8 kmemleak: Add the... |
643 |
WARN_ON(!(object->flags & OBJECT_ALLOCATED)); |
e781a9ab4 mm: kmemleak: fix... |
644 |
WARN_ON(atomic_read(&object->use_count) < 1); |
3c7b4e6b8 kmemleak: Add the... |
645 646 647 648 649 650 |
/* * Locking here also ensures that the corresponding memory block * cannot be freed when it is being scanned. */ spin_lock_irqsave(&object->lock, flags); |
3c7b4e6b8 kmemleak: Add the... |
651 652 653 654 655 656 |
object->flags &= ~OBJECT_ALLOCATED; spin_unlock_irqrestore(&object->lock, flags); put_object(object); } /* |
53238a60d kmemleak: Allow p... |
657 658 659 660 661 662 |
* Look up the metadata (struct kmemleak_object) corresponding to ptr and * delete it. */ static void delete_object_full(unsigned long ptr) { struct kmemleak_object *object; |
e781a9ab4 mm: kmemleak: fix... |
663 |
object = find_and_remove_object(ptr, 0); |
53238a60d kmemleak: Allow p... |
664 665 666 667 668 669 670 671 672 |
if (!object) { #ifdef DEBUG kmemleak_warn("Freeing unknown object at 0x%08lx ", ptr); #endif return; } __delete_object(object); |
53238a60d kmemleak: Allow p... |
673 674 675 676 677 678 679 680 681 682 683 |
} /* * Look up the metadata (struct kmemleak_object) corresponding to ptr and * delete it. If the memory block is partially freed, the function may create * additional metadata for the remaining parts of the block. */ static void delete_object_part(unsigned long ptr, size_t size) { struct kmemleak_object *object; unsigned long start, end; |
e781a9ab4 mm: kmemleak: fix... |
684 |
object = find_and_remove_object(ptr, 1); |
53238a60d kmemleak: Allow p... |
685 686 |
if (!object) { #ifdef DEBUG |
756a025f0 mm: coalesce spli... |
687 688 689 |
kmemleak_warn("Partially freeing unknown object at 0x%08lx (size %zu) ", ptr, size); |
53238a60d kmemleak: Allow p... |
690 691 692 |
#endif return; } |
53238a60d kmemleak: Allow p... |
693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 |
/* * Create one or two objects that may result from the memory block * split. Note that partial freeing is only done by free_bootmem() and * this happens before kmemleak_init() is called. The path below is * only executed during early log recording in kmemleak_init(), so * GFP_KERNEL is enough. */ start = object->pointer; end = object->pointer + object->size; if (ptr > start) create_object(start, ptr - start, object->min_count, GFP_KERNEL); if (ptr + size < end) create_object(ptr + size, end - ptr - size, object->min_count, GFP_KERNEL); |
e781a9ab4 mm: kmemleak: fix... |
709 |
__delete_object(object); |
53238a60d kmemleak: Allow p... |
710 |
} |
a1084c877 kmemleak: move co... |
711 712 713 714 715 716 717 718 719 |
static void __paint_it(struct kmemleak_object *object, int color) { object->min_count = color; if (color == KMEMLEAK_BLACK) object->flags |= OBJECT_NO_SCAN; } static void paint_it(struct kmemleak_object *object, int color) |
3c7b4e6b8 kmemleak: Add the... |
720 721 |
{ unsigned long flags; |
a1084c877 kmemleak: move co... |
722 723 724 725 726 727 728 729 |
spin_lock_irqsave(&object->lock, flags); __paint_it(object, color); spin_unlock_irqrestore(&object->lock, flags); } static void paint_ptr(unsigned long ptr, int color) { |
3c7b4e6b8 kmemleak: Add the... |
730 731 732 733 |
struct kmemleak_object *object; object = find_and_get_object(ptr, 0); if (!object) { |
756a025f0 mm: coalesce spli... |
734 735 736 |
kmemleak_warn("Trying to color unknown object at 0x%08lx as %s ", ptr, |
a1084c877 kmemleak: move co... |
737 738 |
(color == KMEMLEAK_GREY) ? "Grey" : (color == KMEMLEAK_BLACK) ? "Black" : "Unknown"); |
3c7b4e6b8 kmemleak: Add the... |
739 740 |
return; } |
a1084c877 kmemleak: move co... |
741 |
paint_it(object, color); |
3c7b4e6b8 kmemleak: Add the... |
742 743 744 745 |
put_object(object); } /* |
145b64b95 kmemleak: Fix typ... |
746 |
* Mark an object permanently as gray-colored so that it can no longer be |
a1084c877 kmemleak: move co... |
747 748 749 750 751 752 753 754 |
* reported as a leak. This is used in general to mark a false positive. */ static void make_gray_object(unsigned long ptr) { paint_ptr(ptr, KMEMLEAK_GREY); } /* |
3c7b4e6b8 kmemleak: Add the... |
755 756 757 758 759 |
* Mark the object as black-colored so that it is ignored from scans and * reporting. */ static void make_black_object(unsigned long ptr) { |
a1084c877 kmemleak: move co... |
760 |
paint_ptr(ptr, KMEMLEAK_BLACK); |
3c7b4e6b8 kmemleak: Add the... |
761 762 763 764 765 766 |
} /* * Add a scanning area to the object. If at least one such area is added, * kmemleak will only scan these ranges rather than the whole memory block. */ |
c017b4be3 kmemleak: Simplif... |
767 |
static void add_scan_area(unsigned long ptr, size_t size, gfp_t gfp) |
3c7b4e6b8 kmemleak: Add the... |
768 769 770 771 |
{ unsigned long flags; struct kmemleak_object *object; struct kmemleak_scan_area *area; |
c017b4be3 kmemleak: Simplif... |
772 |
object = find_and_get_object(ptr, 1); |
3c7b4e6b8 kmemleak: Add the... |
773 |
if (!object) { |
ae281064b kmemleak: use pr_fmt |
774 775 776 |
kmemleak_warn("Adding scan area to unknown object at 0x%08lx ", ptr); |
3c7b4e6b8 kmemleak: Add the... |
777 778 |
return; } |
6ae4bd1f0 kmemleak: Allow k... |
779 |
area = kmem_cache_alloc(scan_area_cache, gfp_kmemleak_mask(gfp)); |
3c7b4e6b8 kmemleak: Add the... |
780 |
if (!area) { |
598d80914 mm: convert pr_wa... |
781 782 |
pr_warn("Cannot allocate a scan area "); |
3c7b4e6b8 kmemleak: Add the... |
783 784 785 786 |
goto out; } spin_lock_irqsave(&object->lock, flags); |
7f88f88f8 mm: kmemleak: avo... |
787 788 789 |
if (size == SIZE_MAX) { size = object->pointer + object->size - ptr; } else if (ptr + size > object->pointer + object->size) { |
ae281064b kmemleak: use pr_fmt |
790 791 |
kmemleak_warn("Scan area larger than object 0x%08lx ", ptr); |
3c7b4e6b8 kmemleak: Add the... |
792 793 794 795 796 797 |
dump_object_info(object); kmem_cache_free(scan_area_cache, area); goto out_unlock; } INIT_HLIST_NODE(&area->node); |
c017b4be3 kmemleak: Simplif... |
798 799 |
area->start = ptr; area->size = size; |
3c7b4e6b8 kmemleak: Add the... |
800 801 802 803 804 805 806 807 808 |
hlist_add_head(&area->node, &object->area_list); out_unlock: spin_unlock_irqrestore(&object->lock, flags); out: put_object(object); } /* |
94f4a1618 mm: kmemleak: tre... |
809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 |
* Any surplus references (object already gray) to 'ptr' are passed to * 'excess_ref'. This is used in the vmalloc() case where a pointer to * vm_struct may be used as an alternative reference to the vmalloc'ed object * (see free_thread_stack()). */ static void object_set_excess_ref(unsigned long ptr, unsigned long excess_ref) { unsigned long flags; struct kmemleak_object *object; object = find_and_get_object(ptr, 0); if (!object) { kmemleak_warn("Setting excess_ref on unknown object at 0x%08lx ", ptr); return; } spin_lock_irqsave(&object->lock, flags); object->excess_ref = excess_ref; spin_unlock_irqrestore(&object->lock, flags); put_object(object); } /* |
3c7b4e6b8 kmemleak: Add the... |
834 835 836 837 838 839 840 841 842 843 844 |
* Set the OBJECT_NO_SCAN flag for the object corresponding to the give * pointer. Such object will not be scanned by kmemleak but references to it * are searched. */ static void object_no_scan(unsigned long ptr) { unsigned long flags; struct kmemleak_object *object; object = find_and_get_object(ptr, 0); if (!object) { |
ae281064b kmemleak: use pr_fmt |
845 846 |
kmemleak_warn("Not scanning unknown object at 0x%08lx ", ptr); |
3c7b4e6b8 kmemleak: Add the... |
847 848 849 850 851 852 853 854 855 856 857 858 859 |
return; } spin_lock_irqsave(&object->lock, flags); object->flags |= OBJECT_NO_SCAN; spin_unlock_irqrestore(&object->lock, flags); put_object(object); } /* * Log an early kmemleak_* call to the early_log buffer. These calls will be * processed later once kmemleak is fully initialized. */ |
a6186d89c kmemleak: Mark th... |
860 |
static void __init log_early(int op_type, const void *ptr, size_t size, |
c017b4be3 kmemleak: Simplif... |
861 |
int min_count) |
3c7b4e6b8 kmemleak: Add the... |
862 863 864 |
{ unsigned long flags; struct early_log *log; |
8910ae896 kmemleak: change ... |
865 |
if (kmemleak_error) { |
b66930052 kmemleak: When th... |
866 867 868 869 |
/* kmemleak stopped recording, just count the requests */ crt_early_log++; return; } |
3c7b4e6b8 kmemleak: Add the... |
870 |
if (crt_early_log >= ARRAY_SIZE(early_log)) { |
21cd3a604 kmemleak: record ... |
871 |
crt_early_log++; |
a9d9058ab kmemleak: Allow t... |
872 |
kmemleak_disable(); |
3c7b4e6b8 kmemleak: Add the... |
873 874 875 876 877 878 879 880 881 882 883 884 885 |
return; } /* * There is no need for locking since the kernel is still in UP mode * at this stage. Disabling the IRQs is enough. */ local_irq_save(flags); log = &early_log[crt_early_log]; log->op_type = op_type; log->ptr = ptr; log->size = size; log->min_count = min_count; |
5f79020cb kmemleak: Show wh... |
886 |
log->trace_len = __save_stack_trace(log->trace); |
3c7b4e6b8 kmemleak: Add the... |
887 888 889 890 891 |
crt_early_log++; local_irq_restore(flags); } /* |
fd6789675 kmemleak: Save th... |
892 893 894 895 896 897 898 |
* Log an early allocated block and populate the stack trace. */ static void early_alloc(struct early_log *log) { struct kmemleak_object *object; unsigned long flags; int i; |
8910ae896 kmemleak: change ... |
899 |
if (!kmemleak_enabled || !log->ptr || IS_ERR(log->ptr)) |
fd6789675 kmemleak: Save th... |
900 901 902 903 904 905 906 |
return; /* * RCU locking needed to ensure object is not freed via put_object(). */ rcu_read_lock(); object = create_object((unsigned long)log->ptr, log->size, |
c1bcd6b32 kmemleak: Use GFP... |
907 |
log->min_count, GFP_ATOMIC); |
0d5d1aadc kmemleak: Check f... |
908 909 |
if (!object) goto out; |
fd6789675 kmemleak: Save th... |
910 911 912 913 914 |
spin_lock_irqsave(&object->lock, flags); for (i = 0; i < log->trace_len; i++) object->trace[i] = log->trace[i]; object->trace_len = log->trace_len; spin_unlock_irqrestore(&object->lock, flags); |
0d5d1aadc kmemleak: Check f... |
915 |
out: |
fd6789675 kmemleak: Save th... |
916 917 |
rcu_read_unlock(); } |
f528f0b8e kmemleak: Handle ... |
918 919 920 921 922 923 924 925 926 927 928 929 930 |
/* * Log an early allocated block and populate the stack trace. */ static void early_alloc_percpu(struct early_log *log) { unsigned int cpu; const void __percpu *ptr = log->ptr; for_each_possible_cpu(cpu) { log->ptr = per_cpu_ptr(ptr, cpu); early_alloc(log); } } |
a2b6bf63c kmemleak: Add Doc... |
931 932 933 934 935 936 937 938 939 940 941 942 |
/** * kmemleak_alloc - register a newly allocated object * @ptr: pointer to beginning of the object * @size: size of the object * @min_count: minimum number of references to this object. If during memory * scanning a number of references less than @min_count is found, * the object is reported as a memory leak. If @min_count is 0, * the object is never reported as a leak. If @min_count is -1, * the object is ignored (not scanned and not reported as a leak) * @gfp: kmalloc() flags used for kmemleak internal memory allocations * * This function is called from the kernel allocators when a new object |
94f4a1618 mm: kmemleak: tre... |
943 |
* (memory block) is allocated (kmem_cache_alloc, kmalloc etc.). |
3c7b4e6b8 kmemleak: Add the... |
944 |
*/ |
a6186d89c kmemleak: Mark th... |
945 946 |
void __ref kmemleak_alloc(const void *ptr, size_t size, int min_count, gfp_t gfp) |
3c7b4e6b8 kmemleak: Add the... |
947 948 949 |
{ pr_debug("%s(0x%p, %zu, %d) ", __func__, ptr, size, min_count); |
8910ae896 kmemleak: change ... |
950 |
if (kmemleak_enabled && ptr && !IS_ERR(ptr)) |
3c7b4e6b8 kmemleak: Add the... |
951 |
create_object((unsigned long)ptr, size, min_count, gfp); |
8910ae896 kmemleak: change ... |
952 |
else if (kmemleak_early_log) |
c017b4be3 kmemleak: Simplif... |
953 |
log_early(KMEMLEAK_ALLOC, ptr, size, min_count); |
3c7b4e6b8 kmemleak: Add the... |
954 955 |
} EXPORT_SYMBOL_GPL(kmemleak_alloc); |
a2b6bf63c kmemleak: Add Doc... |
956 |
/** |
f528f0b8e kmemleak: Handle ... |
957 958 959 |
* kmemleak_alloc_percpu - register a newly allocated __percpu object * @ptr: __percpu pointer to beginning of the object * @size: size of the object |
8a8c35fad mm: kmemleak_allo... |
960 |
* @gfp: flags used for kmemleak internal memory allocations |
f528f0b8e kmemleak: Handle ... |
961 962 |
* * This function is called from the kernel percpu allocator when a new object |
8a8c35fad mm: kmemleak_allo... |
963 |
* (memory block) is allocated (alloc_percpu). |
f528f0b8e kmemleak: Handle ... |
964 |
*/ |
8a8c35fad mm: kmemleak_allo... |
965 966 |
void __ref kmemleak_alloc_percpu(const void __percpu *ptr, size_t size, gfp_t gfp) |
f528f0b8e kmemleak: Handle ... |
967 968 969 970 971 972 973 974 975 976 |
{ unsigned int cpu; pr_debug("%s(0x%p, %zu) ", __func__, ptr, size); /* * Percpu allocations are only scanned and not reported as leaks * (min_count is set to 0). */ |
8910ae896 kmemleak: change ... |
977 |
if (kmemleak_enabled && ptr && !IS_ERR(ptr)) |
f528f0b8e kmemleak: Handle ... |
978 979 |
for_each_possible_cpu(cpu) create_object((unsigned long)per_cpu_ptr(ptr, cpu), |
8a8c35fad mm: kmemleak_allo... |
980 |
size, 0, gfp); |
8910ae896 kmemleak: change ... |
981 |
else if (kmemleak_early_log) |
f528f0b8e kmemleak: Handle ... |
982 983 984 985 986 |
log_early(KMEMLEAK_ALLOC_PERCPU, ptr, size, 0); } EXPORT_SYMBOL_GPL(kmemleak_alloc_percpu); /** |
94f4a1618 mm: kmemleak: tre... |
987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 |
* kmemleak_vmalloc - register a newly vmalloc'ed object * @area: pointer to vm_struct * @size: size of the object * @gfp: __vmalloc() flags used for kmemleak internal memory allocations * * This function is called from the vmalloc() kernel allocator when a new * object (memory block) is allocated. */ void __ref kmemleak_vmalloc(const struct vm_struct *area, size_t size, gfp_t gfp) { pr_debug("%s(0x%p, %zu) ", __func__, area, size); /* * A min_count = 2 is needed because vm_struct contains a reference to * the virtual address of the vmalloc'ed block. */ if (kmemleak_enabled) { create_object((unsigned long)area->addr, size, 2, gfp); object_set_excess_ref((unsigned long)area, (unsigned long)area->addr); } else if (kmemleak_early_log) { log_early(KMEMLEAK_ALLOC, area->addr, size, 2); /* reusing early_log.size for storing area->addr */ log_early(KMEMLEAK_SET_EXCESS_REF, area, (unsigned long)area->addr, 0); } } EXPORT_SYMBOL_GPL(kmemleak_vmalloc); /** |
a2b6bf63c kmemleak: Add Doc... |
1018 1019 1020 1021 1022 |
* kmemleak_free - unregister a previously registered object * @ptr: pointer to beginning of the object * * This function is called from the kernel allocators when an object (memory * block) is freed (kmem_cache_free, kfree, vfree etc.). |
3c7b4e6b8 kmemleak: Add the... |
1023 |
*/ |
a6186d89c kmemleak: Mark th... |
1024 |
void __ref kmemleak_free(const void *ptr) |
3c7b4e6b8 kmemleak: Add the... |
1025 1026 1027 |
{ pr_debug("%s(0x%p) ", __func__, ptr); |
c5f3b1a51 mm: kmemleak: all... |
1028 |
if (kmemleak_free_enabled && ptr && !IS_ERR(ptr)) |
53238a60d kmemleak: Allow p... |
1029 |
delete_object_full((unsigned long)ptr); |
8910ae896 kmemleak: change ... |
1030 |
else if (kmemleak_early_log) |
c017b4be3 kmemleak: Simplif... |
1031 |
log_early(KMEMLEAK_FREE, ptr, 0, 0); |
3c7b4e6b8 kmemleak: Add the... |
1032 1033 |
} EXPORT_SYMBOL_GPL(kmemleak_free); |
a2b6bf63c kmemleak: Add Doc... |
1034 1035 1036 1037 1038 1039 1040 1041 |
/** * kmemleak_free_part - partially unregister a previously registered object * @ptr: pointer to the beginning or inside the object. This also * represents the start of the range to be freed * @size: size to be unregistered * * This function is called when only a part of a memory block is freed * (usually from the bootmem allocator). |
53238a60d kmemleak: Allow p... |
1042 |
*/ |
a6186d89c kmemleak: Mark th... |
1043 |
void __ref kmemleak_free_part(const void *ptr, size_t size) |
53238a60d kmemleak: Allow p... |
1044 1045 1046 |
{ pr_debug("%s(0x%p) ", __func__, ptr); |
8910ae896 kmemleak: change ... |
1047 |
if (kmemleak_enabled && ptr && !IS_ERR(ptr)) |
53238a60d kmemleak: Allow p... |
1048 |
delete_object_part((unsigned long)ptr, size); |
8910ae896 kmemleak: change ... |
1049 |
else if (kmemleak_early_log) |
c017b4be3 kmemleak: Simplif... |
1050 |
log_early(KMEMLEAK_FREE_PART, ptr, size, 0); |
53238a60d kmemleak: Allow p... |
1051 1052 |
} EXPORT_SYMBOL_GPL(kmemleak_free_part); |
a2b6bf63c kmemleak: Add Doc... |
1053 |
/** |
f528f0b8e kmemleak: Handle ... |
1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 |
* kmemleak_free_percpu - unregister a previously registered __percpu object * @ptr: __percpu pointer to beginning of the object * * This function is called from the kernel percpu allocator when an object * (memory block) is freed (free_percpu). */ void __ref kmemleak_free_percpu(const void __percpu *ptr) { unsigned int cpu; pr_debug("%s(0x%p) ", __func__, ptr); |
c5f3b1a51 mm: kmemleak: all... |
1066 |
if (kmemleak_free_enabled && ptr && !IS_ERR(ptr)) |
f528f0b8e kmemleak: Handle ... |
1067 1068 1069 |
for_each_possible_cpu(cpu) delete_object_full((unsigned long)per_cpu_ptr(ptr, cpu)); |
8910ae896 kmemleak: change ... |
1070 |
else if (kmemleak_early_log) |
f528f0b8e kmemleak: Handle ... |
1071 1072 1073 1074 1075 |
log_early(KMEMLEAK_FREE_PERCPU, ptr, 0, 0); } EXPORT_SYMBOL_GPL(kmemleak_free_percpu); /** |
ffe2c748e mm: introduce kme... |
1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 |
* kmemleak_update_trace - update object allocation stack trace * @ptr: pointer to beginning of the object * * Override the object allocation stack trace for cases where the actual * allocation place is not always useful. */ void __ref kmemleak_update_trace(const void *ptr) { struct kmemleak_object *object; unsigned long flags; pr_debug("%s(0x%p) ", __func__, ptr); if (!kmemleak_enabled || IS_ERR_OR_NULL(ptr)) return; object = find_and_get_object((unsigned long)ptr, 1); if (!object) { #ifdef DEBUG kmemleak_warn("Updating stack trace for unknown object at %p ", ptr); #endif return; } spin_lock_irqsave(&object->lock, flags); object->trace_len = __save_stack_trace(object->trace); spin_unlock_irqrestore(&object->lock, flags); put_object(object); } EXPORT_SYMBOL(kmemleak_update_trace); /** |
a2b6bf63c kmemleak: Add Doc... |
1112 1113 1114 1115 1116 |
* kmemleak_not_leak - mark an allocated object as false positive * @ptr: pointer to beginning of the object * * Calling this function on an object will cause the memory block to no longer * be reported as leak and always be scanned. |
3c7b4e6b8 kmemleak: Add the... |
1117 |
*/ |
a6186d89c kmemleak: Mark th... |
1118 |
void __ref kmemleak_not_leak(const void *ptr) |
3c7b4e6b8 kmemleak: Add the... |
1119 1120 1121 |
{ pr_debug("%s(0x%p) ", __func__, ptr); |
8910ae896 kmemleak: change ... |
1122 |
if (kmemleak_enabled && ptr && !IS_ERR(ptr)) |
3c7b4e6b8 kmemleak: Add the... |
1123 |
make_gray_object((unsigned long)ptr); |
8910ae896 kmemleak: change ... |
1124 |
else if (kmemleak_early_log) |
c017b4be3 kmemleak: Simplif... |
1125 |
log_early(KMEMLEAK_NOT_LEAK, ptr, 0, 0); |
3c7b4e6b8 kmemleak: Add the... |
1126 1127 |
} EXPORT_SYMBOL(kmemleak_not_leak); |
a2b6bf63c kmemleak: Add Doc... |
1128 1129 1130 1131 1132 1133 1134 1135 |
/** * kmemleak_ignore - ignore an allocated object * @ptr: pointer to beginning of the object * * Calling this function on an object will cause the memory block to be * ignored (not scanned and not reported as a leak). This is usually done when * it is known that the corresponding block is not a leak and does not contain * any references to other allocated memory blocks. |
3c7b4e6b8 kmemleak: Add the... |
1136 |
*/ |
a6186d89c kmemleak: Mark th... |
1137 |
void __ref kmemleak_ignore(const void *ptr) |
3c7b4e6b8 kmemleak: Add the... |
1138 1139 1140 |
{ pr_debug("%s(0x%p) ", __func__, ptr); |
8910ae896 kmemleak: change ... |
1141 |
if (kmemleak_enabled && ptr && !IS_ERR(ptr)) |
3c7b4e6b8 kmemleak: Add the... |
1142 |
make_black_object((unsigned long)ptr); |
8910ae896 kmemleak: change ... |
1143 |
else if (kmemleak_early_log) |
c017b4be3 kmemleak: Simplif... |
1144 |
log_early(KMEMLEAK_IGNORE, ptr, 0, 0); |
3c7b4e6b8 kmemleak: Add the... |
1145 1146 |
} EXPORT_SYMBOL(kmemleak_ignore); |
a2b6bf63c kmemleak: Add Doc... |
1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 |
/** * kmemleak_scan_area - limit the range to be scanned in an allocated object * @ptr: pointer to beginning or inside the object. This also * represents the start of the scan area * @size: size of the scan area * @gfp: kmalloc() flags used for kmemleak internal memory allocations * * This function is used when it is known that only certain parts of an object * contain references to other objects. Kmemleak will only scan these areas * reducing the number false negatives. |
3c7b4e6b8 kmemleak: Add the... |
1157 |
*/ |
c017b4be3 kmemleak: Simplif... |
1158 |
void __ref kmemleak_scan_area(const void *ptr, size_t size, gfp_t gfp) |
3c7b4e6b8 kmemleak: Add the... |
1159 1160 1161 |
{ pr_debug("%s(0x%p) ", __func__, ptr); |
8910ae896 kmemleak: change ... |
1162 |
if (kmemleak_enabled && ptr && size && !IS_ERR(ptr)) |
c017b4be3 kmemleak: Simplif... |
1163 |
add_scan_area((unsigned long)ptr, size, gfp); |
8910ae896 kmemleak: change ... |
1164 |
else if (kmemleak_early_log) |
c017b4be3 kmemleak: Simplif... |
1165 |
log_early(KMEMLEAK_SCAN_AREA, ptr, size, 0); |
3c7b4e6b8 kmemleak: Add the... |
1166 1167 |
} EXPORT_SYMBOL(kmemleak_scan_area); |
a2b6bf63c kmemleak: Add Doc... |
1168 1169 1170 1171 1172 1173 1174 1175 |
/** * kmemleak_no_scan - do not scan an allocated object * @ptr: pointer to beginning of the object * * This function notifies kmemleak not to scan the given memory block. Useful * in situations where it is known that the given object does not contain any * references to other objects. Kmemleak will not scan such objects reducing * the number of false negatives. |
3c7b4e6b8 kmemleak: Add the... |
1176 |
*/ |
a6186d89c kmemleak: Mark th... |
1177 |
void __ref kmemleak_no_scan(const void *ptr) |
3c7b4e6b8 kmemleak: Add the... |
1178 1179 1180 |
{ pr_debug("%s(0x%p) ", __func__, ptr); |
8910ae896 kmemleak: change ... |
1181 |
if (kmemleak_enabled && ptr && !IS_ERR(ptr)) |
3c7b4e6b8 kmemleak: Add the... |
1182 |
object_no_scan((unsigned long)ptr); |
8910ae896 kmemleak: change ... |
1183 |
else if (kmemleak_early_log) |
c017b4be3 kmemleak: Simplif... |
1184 |
log_early(KMEMLEAK_NO_SCAN, ptr, 0, 0); |
3c7b4e6b8 kmemleak: Add the... |
1185 1186 |
} EXPORT_SYMBOL(kmemleak_no_scan); |
9099daed9 mm: kmemleak: avo... |
1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 |
/** * kmemleak_alloc_phys - similar to kmemleak_alloc but taking a physical * address argument */ void __ref kmemleak_alloc_phys(phys_addr_t phys, size_t size, int min_count, gfp_t gfp) { if (!IS_ENABLED(CONFIG_HIGHMEM) || PHYS_PFN(phys) < max_low_pfn) kmemleak_alloc(__va(phys), size, min_count, gfp); } EXPORT_SYMBOL(kmemleak_alloc_phys); /** * kmemleak_free_part_phys - similar to kmemleak_free_part but taking a * physical address argument */ void __ref kmemleak_free_part_phys(phys_addr_t phys, size_t size) { if (!IS_ENABLED(CONFIG_HIGHMEM) || PHYS_PFN(phys) < max_low_pfn) kmemleak_free_part(__va(phys), size); } EXPORT_SYMBOL(kmemleak_free_part_phys); /** * kmemleak_not_leak_phys - similar to kmemleak_not_leak but taking a physical * address argument */ void __ref kmemleak_not_leak_phys(phys_addr_t phys) { if (!IS_ENABLED(CONFIG_HIGHMEM) || PHYS_PFN(phys) < max_low_pfn) kmemleak_not_leak(__va(phys)); } EXPORT_SYMBOL(kmemleak_not_leak_phys); /** * kmemleak_ignore_phys - similar to kmemleak_ignore but taking a physical * address argument */ void __ref kmemleak_ignore_phys(phys_addr_t phys) { if (!IS_ENABLED(CONFIG_HIGHMEM) || PHYS_PFN(phys) < max_low_pfn) kmemleak_ignore(__va(phys)); } EXPORT_SYMBOL(kmemleak_ignore_phys); |
3c7b4e6b8 kmemleak: Add the... |
1231 |
/* |
04609ccc4 kmemleak: Reduce ... |
1232 1233 1234 1235 1236 |
* Update an object's checksum and return true if it was modified. */ static bool update_checksum(struct kmemleak_object *object) { u32 old_csum = object->checksum; |
e79ed2f13 kmemleak: disable... |
1237 |
kasan_disable_current(); |
04609ccc4 kmemleak: Reduce ... |
1238 |
object->checksum = crc32(0, (void *)object->pointer, object->size); |
e79ed2f13 kmemleak: disable... |
1239 |
kasan_enable_current(); |
04609ccc4 kmemleak: Reduce ... |
1240 1241 1242 1243 |
return object->checksum != old_csum; } /* |
04f70d13c mm: kmemleak: fac... |
1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 |
* Update an object's references. object->lock must be held by the caller. */ static void update_refs(struct kmemleak_object *object) { if (!color_white(object)) { /* non-orphan, ignored or new */ return; } /* * Increase the object's reference count (number of pointers to the * memory block). If this count reaches the required minimum, the * object's color will become gray and it will be added to the * gray_list. */ object->count++; if (color_gray(object)) { /* put_object() called when removing from gray_list */ WARN_ON(!get_object(object)); list_add_tail(&object->gray_list, &gray_list); } } /* |
3c7b4e6b8 kmemleak: Add the... |
1268 |
* Memory scanning is a long process and it needs to be interruptable. This |
25985edce Fix common misspe... |
1269 |
* function checks whether such interrupt condition occurred. |
3c7b4e6b8 kmemleak: Add the... |
1270 1271 1272 |
*/ static int scan_should_stop(void) { |
8910ae896 kmemleak: change ... |
1273 |
if (!kmemleak_enabled) |
3c7b4e6b8 kmemleak: Add the... |
1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 |
return 1; /* * This function may be called from either process or kthread context, * hence the need to check for both stop conditions. */ if (current->mm) return signal_pending(current); else return kthread_should_stop(); return 0; } /* * Scan a memory block (exclusive range) for valid pointers and add those * found to the gray list. */ static void scan_block(void *_start, void *_end, |
93ada579b mm: kmemleak: opt... |
1293 |
struct kmemleak_object *scanned) |
3c7b4e6b8 kmemleak: Add the... |
1294 1295 1296 1297 |
{ unsigned long *ptr; unsigned long *start = PTR_ALIGN(_start, BYTES_PER_POINTER); unsigned long *end = _end - (BYTES_PER_POINTER - 1); |
93ada579b mm: kmemleak: opt... |
1298 |
unsigned long flags; |
3c7b4e6b8 kmemleak: Add the... |
1299 |
|
93ada579b mm: kmemleak: opt... |
1300 |
read_lock_irqsave(&kmemleak_lock, flags); |
3c7b4e6b8 kmemleak: Add the... |
1301 |
for (ptr = start; ptr < end; ptr++) { |
3c7b4e6b8 kmemleak: Add the... |
1302 |
struct kmemleak_object *object; |
8e019366b kmemleak: Don't s... |
1303 |
unsigned long pointer; |
94f4a1618 mm: kmemleak: tre... |
1304 |
unsigned long excess_ref; |
3c7b4e6b8 kmemleak: Add the... |
1305 1306 1307 |
if (scan_should_stop()) break; |
e79ed2f13 kmemleak: disable... |
1308 |
kasan_disable_current(); |
8e019366b kmemleak: Don't s... |
1309 |
pointer = *ptr; |
e79ed2f13 kmemleak: disable... |
1310 |
kasan_enable_current(); |
8e019366b kmemleak: Don't s... |
1311 |
|
93ada579b mm: kmemleak: opt... |
1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 |
if (pointer < min_addr || pointer >= max_addr) continue; /* * No need for get_object() here since we hold kmemleak_lock. * object->use_count cannot be dropped to 0 while the object * is still present in object_tree_root and object_list * (with updates protected by kmemleak_lock). */ object = lookup_object(pointer, 1); |
3c7b4e6b8 kmemleak: Add the... |
1322 1323 |
if (!object) continue; |
93ada579b mm: kmemleak: opt... |
1324 |
if (object == scanned) |
3c7b4e6b8 kmemleak: Add the... |
1325 |
/* self referenced, ignore */ |
3c7b4e6b8 kmemleak: Add the... |
1326 |
continue; |
3c7b4e6b8 kmemleak: Add the... |
1327 1328 1329 1330 1331 1332 |
/* * Avoid the lockdep recursive warning on object->lock being * previously acquired in scan_object(). These locks are * enclosed by scan_mutex. */ |
93ada579b mm: kmemleak: opt... |
1333 |
spin_lock_nested(&object->lock, SINGLE_DEPTH_NESTING); |
94f4a1618 mm: kmemleak: tre... |
1334 1335 1336 1337 1338 1339 1340 1341 |
/* only pass surplus references (object already gray) */ if (color_gray(object)) { excess_ref = object->excess_ref; /* no need for update_refs() if object already gray */ } else { excess_ref = 0; update_refs(object); } |
93ada579b mm: kmemleak: opt... |
1342 |
spin_unlock(&object->lock); |
94f4a1618 mm: kmemleak: tre... |
1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 |
if (excess_ref) { object = lookup_object(excess_ref, 0); if (!object) continue; if (object == scanned) /* circular reference, ignore */ continue; spin_lock_nested(&object->lock, SINGLE_DEPTH_NESTING); update_refs(object); spin_unlock(&object->lock); } |
93ada579b mm: kmemleak: opt... |
1355 1356 1357 |
} read_unlock_irqrestore(&kmemleak_lock, flags); } |
0587da40b kmemleak: Release... |
1358 |
|
93ada579b mm: kmemleak: opt... |
1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 |
/* * Scan a large memory block in MAX_SCAN_SIZE chunks to reduce the latency. */ static void scan_large_block(void *start, void *end) { void *next; while (start < end) { next = min(start + MAX_SCAN_SIZE, end); scan_block(start, next, NULL); start = next; cond_resched(); |
3c7b4e6b8 kmemleak: Add the... |
1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 |
} } /* * Scan a memory block corresponding to a kmemleak_object. A condition is * that object->use_count >= 1. */ static void scan_object(struct kmemleak_object *object) { struct kmemleak_scan_area *area; |
3c7b4e6b8 kmemleak: Add the... |
1381 1382 1383 |
unsigned long flags; /* |
21ae2956c tree-wide: fix ty... |
1384 1385 |
* Once the object->lock is acquired, the corresponding memory block * cannot be freed (the same lock is acquired in delete_object). |
3c7b4e6b8 kmemleak: Add the... |
1386 1387 1388 1389 1390 1391 1392 |
*/ spin_lock_irqsave(&object->lock, flags); if (object->flags & OBJECT_NO_SCAN) goto out; if (!(object->flags & OBJECT_ALLOCATED)) /* already freed object */ goto out; |
af98603da kmemleak: Allow r... |
1393 1394 1395 |
if (hlist_empty(&object->area_list)) { void *start = (void *)object->pointer; void *end = (void *)(object->pointer + object->size); |
93ada579b mm: kmemleak: opt... |
1396 1397 1398 1399 1400 |
void *next; do { next = min(start + MAX_SCAN_SIZE, end); scan_block(start, next, object); |
af98603da kmemleak: Allow r... |
1401 |
|
93ada579b mm: kmemleak: opt... |
1402 1403 1404 |
start = next; if (start >= end) break; |
af98603da kmemleak: Allow r... |
1405 1406 1407 1408 |
spin_unlock_irqrestore(&object->lock, flags); cond_resched(); spin_lock_irqsave(&object->lock, flags); |
93ada579b mm: kmemleak: opt... |
1409 |
} while (object->flags & OBJECT_ALLOCATED); |
af98603da kmemleak: Allow r... |
1410 |
} else |
b67bfe0d4 hlist: drop the n... |
1411 |
hlist_for_each_entry(area, &object->area_list, node) |
c017b4be3 kmemleak: Simplif... |
1412 1413 |
scan_block((void *)area->start, (void *)(area->start + area->size), |
93ada579b mm: kmemleak: opt... |
1414 |
object); |
3c7b4e6b8 kmemleak: Add the... |
1415 1416 1417 1418 1419 |
out: spin_unlock_irqrestore(&object->lock, flags); } /* |
04609ccc4 kmemleak: Reduce ... |
1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 |
* Scan the objects already referenced (gray objects). More objects will be * referenced and, if there are no memory leaks, all the objects are scanned. */ static void scan_gray_list(void) { struct kmemleak_object *object, *tmp; /* * The list traversal is safe for both tail additions and removals * from inside the loop. The kmemleak objects cannot be freed from * outside the loop because their use_count was incremented. */ object = list_entry(gray_list.next, typeof(*object), gray_list); while (&object->gray_list != &gray_list) { cond_resched(); /* may add new objects to the list */ if (!scan_should_stop()) scan_object(object); tmp = list_entry(object->gray_list.next, typeof(*object), gray_list); /* remove the object from the list and release it */ list_del(&object->gray_list); put_object(object); object = tmp; } WARN_ON(!list_empty(&gray_list)); } /* |
3c7b4e6b8 kmemleak: Add the... |
1453 1454 1455 1456 1457 1458 1459 |
* Scan data sections and all the referenced memory blocks allocated via the * kernel's standard allocators. This function must be called with the * scan_mutex held. */ static void kmemleak_scan(void) { unsigned long flags; |
04609ccc4 kmemleak: Reduce ... |
1460 |
struct kmemleak_object *object; |
3c7b4e6b8 kmemleak: Add the... |
1461 |
int i; |
4698c1f2b kmemleak: Do not ... |
1462 |
int new_leaks = 0; |
3c7b4e6b8 kmemleak: Add the... |
1463 |
|
acf4968ec kmemleak: Slightl... |
1464 |
jiffies_last_scan = jiffies; |
3c7b4e6b8 kmemleak: Add the... |
1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 |
/* prepare the kmemleak_object's */ rcu_read_lock(); list_for_each_entry_rcu(object, &object_list, object_list) { spin_lock_irqsave(&object->lock, flags); #ifdef DEBUG /* * With a few exceptions there should be a maximum of * 1 reference to any object at this point. */ if (atomic_read(&object->use_count) > 1) { |
ae281064b kmemleak: use pr_fmt |
1475 1476 |
pr_debug("object->use_count = %d ", |
3c7b4e6b8 kmemleak: Add the... |
1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 |
atomic_read(&object->use_count)); dump_object_info(object); } #endif /* reset the reference count (whiten the object) */ object->count = 0; if (color_gray(object) && get_object(object)) list_add_tail(&object->gray_list, &gray_list); spin_unlock_irqrestore(&object->lock, flags); } rcu_read_unlock(); /* data/bss scanning */ |
93ada579b mm: kmemleak: opt... |
1491 1492 |
scan_large_block(_sdata, _edata); scan_large_block(__bss_start, __bss_stop); |
906f2a51c mm: fix section n... |
1493 |
scan_large_block(__start_ro_after_init, __end_ro_after_init); |
3c7b4e6b8 kmemleak: Add the... |
1494 1495 1496 1497 |
#ifdef CONFIG_SMP /* per-cpu sections scanning */ for_each_possible_cpu(i) |
93ada579b mm: kmemleak: opt... |
1498 1499 |
scan_large_block(__per_cpu_start + per_cpu_offset(i), __per_cpu_end + per_cpu_offset(i)); |
3c7b4e6b8 kmemleak: Add the... |
1500 1501 1502 |
#endif /* |
029aeff5d kmemleak: Add sup... |
1503 |
* Struct page scanning for each node. |
3c7b4e6b8 kmemleak: Add the... |
1504 |
*/ |
bfc8c9013 mem-hotplug: impl... |
1505 |
get_online_mems(); |
3c7b4e6b8 kmemleak: Add the... |
1506 |
for_each_online_node(i) { |
108bcc96e mm: add & use zon... |
1507 1508 |
unsigned long start_pfn = node_start_pfn(i); unsigned long end_pfn = node_end_pfn(i); |
3c7b4e6b8 kmemleak: Add the... |
1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 |
unsigned long pfn; for (pfn = start_pfn; pfn < end_pfn; pfn++) { struct page *page; if (!pfn_valid(pfn)) continue; page = pfn_to_page(pfn); /* only scan if page is in use */ if (page_count(page) == 0) continue; |
93ada579b mm: kmemleak: opt... |
1520 |
scan_block(page, page + 1, NULL); |
b2ba0bd34 kmemleak: add sch... |
1521 1522 |
if (!(pfn % (MAX_SCAN_SIZE / sizeof(*page)))) cond_resched(); |
3c7b4e6b8 kmemleak: Add the... |
1523 1524 |
} } |
bfc8c9013 mem-hotplug: impl... |
1525 |
put_online_mems(); |
3c7b4e6b8 kmemleak: Add the... |
1526 1527 |
/* |
43ed5d6ee kmemleak: Scan al... |
1528 |
* Scanning the task stacks (may introduce false negatives). |
3c7b4e6b8 kmemleak: Add the... |
1529 1530 |
*/ if (kmemleak_stack_scan) { |
43ed5d6ee kmemleak: Scan al... |
1531 |
struct task_struct *p, *g; |
3c7b4e6b8 kmemleak: Add the... |
1532 |
read_lock(&tasklist_lock); |
43ed5d6ee kmemleak: Scan al... |
1533 |
do_each_thread(g, p) { |
37df49f43 mm: kmemleak: ens... |
1534 1535 1536 1537 1538 |
void *stack = try_get_task_stack(p); if (stack) { scan_block(stack, stack + THREAD_SIZE, NULL); put_task_stack(p); } |
43ed5d6ee kmemleak: Scan al... |
1539 |
} while_each_thread(g, p); |
3c7b4e6b8 kmemleak: Add the... |
1540 1541 1542 1543 1544 |
read_unlock(&tasklist_lock); } /* * Scan the objects already referenced from the sections scanned |
04609ccc4 kmemleak: Reduce ... |
1545 |
* above. |
3c7b4e6b8 kmemleak: Add the... |
1546 |
*/ |
04609ccc4 kmemleak: Reduce ... |
1547 |
scan_gray_list(); |
2587362ea kmemleak: Scan ob... |
1548 1549 |
/* |
04609ccc4 kmemleak: Reduce ... |
1550 1551 |
* Check for new or unreferenced objects modified since the previous * scan and color them gray until the next scan. |
2587362ea kmemleak: Scan ob... |
1552 1553 1554 1555 |
*/ rcu_read_lock(); list_for_each_entry_rcu(object, &object_list, object_list) { spin_lock_irqsave(&object->lock, flags); |
04609ccc4 kmemleak: Reduce ... |
1556 1557 1558 1559 |
if (color_white(object) && (object->flags & OBJECT_ALLOCATED) && update_checksum(object) && get_object(object)) { /* color it gray temporarily */ object->count = object->min_count; |
2587362ea kmemleak: Scan ob... |
1560 1561 1562 1563 1564 |
list_add_tail(&object->gray_list, &gray_list); } spin_unlock_irqrestore(&object->lock, flags); } rcu_read_unlock(); |
04609ccc4 kmemleak: Reduce ... |
1565 1566 1567 1568 |
/* * Re-scan the gray list for modified unreferenced objects. */ scan_gray_list(); |
4698c1f2b kmemleak: Do not ... |
1569 1570 |
/* |
04609ccc4 kmemleak: Reduce ... |
1571 |
* If scanning was stopped do not report any new unreferenced objects. |
17bb9e0d9 kmemleak: Do not ... |
1572 |
*/ |
04609ccc4 kmemleak: Reduce ... |
1573 |
if (scan_should_stop()) |
17bb9e0d9 kmemleak: Do not ... |
1574 1575 1576 |
return; /* |
4698c1f2b kmemleak: Do not ... |
1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 |
* Scanning result reporting. */ rcu_read_lock(); list_for_each_entry_rcu(object, &object_list, object_list) { spin_lock_irqsave(&object->lock, flags); if (unreferenced_object(object) && !(object->flags & OBJECT_REPORTED)) { object->flags |= OBJECT_REPORTED; new_leaks++; } spin_unlock_irqrestore(&object->lock, flags); } rcu_read_unlock(); |
dc9b3f424 kmemleak: free in... |
1590 1591 |
if (new_leaks) { kmemleak_found_leaks = true; |
756a025f0 mm: coalesce spli... |
1592 1593 1594 |
pr_info("%d new suspected memory leaks (see /sys/kernel/debug/kmemleak) ", new_leaks); |
dc9b3f424 kmemleak: free in... |
1595 |
} |
4698c1f2b kmemleak: Do not ... |
1596 |
|
3c7b4e6b8 kmemleak: Add the... |
1597 1598 1599 1600 1601 1602 1603 1604 1605 |
} /* * Thread function performing automatic memory scanning. Unreferenced objects * at the end of a memory scan are reported but only the first time. */ static int kmemleak_scan_thread(void *arg) { static int first_run = 1; |
ae281064b kmemleak: use pr_fmt |
1606 1607 |
pr_info("Automatic memory scanning thread started "); |
bf2a76b31 kmemleak: Renice ... |
1608 |
set_user_nice(current, 10); |
3c7b4e6b8 kmemleak: Add the... |
1609 1610 1611 1612 1613 |
/* * Wait before the first scan to allow the system to fully initialize. */ if (first_run) { |
98c42d945 kmemleak: don't h... |
1614 |
signed long timeout = msecs_to_jiffies(SECS_FIRST_SCAN * 1000); |
3c7b4e6b8 kmemleak: Add the... |
1615 |
first_run = 0; |
98c42d945 kmemleak: don't h... |
1616 1617 |
while (timeout && !kthread_should_stop()) timeout = schedule_timeout_interruptible(timeout); |
3c7b4e6b8 kmemleak: Add the... |
1618 1619 1620 |
} while (!kthread_should_stop()) { |
3c7b4e6b8 kmemleak: Add the... |
1621 1622 1623 |
signed long timeout = jiffies_scan_wait; mutex_lock(&scan_mutex); |
3c7b4e6b8 kmemleak: Add the... |
1624 |
kmemleak_scan(); |
3c7b4e6b8 kmemleak: Add the... |
1625 |
mutex_unlock(&scan_mutex); |
4698c1f2b kmemleak: Do not ... |
1626 |
|
3c7b4e6b8 kmemleak: Add the... |
1627 1628 1629 1630 |
/* wait before the next scan */ while (timeout && !kthread_should_stop()) timeout = schedule_timeout_interruptible(timeout); } |
ae281064b kmemleak: use pr_fmt |
1631 1632 |
pr_info("Automatic memory scanning thread ended "); |
3c7b4e6b8 kmemleak: Add the... |
1633 1634 1635 1636 1637 1638 |
return 0; } /* * Start the automatic memory scanning thread. This function must be called |
4698c1f2b kmemleak: Do not ... |
1639 |
* with the scan_mutex held. |
3c7b4e6b8 kmemleak: Add the... |
1640 |
*/ |
7eb0d5e5b kmemleak: fix spa... |
1641 |
static void start_scan_thread(void) |
3c7b4e6b8 kmemleak: Add the... |
1642 1643 1644 1645 1646 |
{ if (scan_thread) return; scan_thread = kthread_run(kmemleak_scan_thread, NULL, "kmemleak"); if (IS_ERR(scan_thread)) { |
598d80914 mm: convert pr_wa... |
1647 1648 |
pr_warn("Failed to create the scan thread "); |
3c7b4e6b8 kmemleak: Add the... |
1649 1650 1651 1652 1653 |
scan_thread = NULL; } } /* |
28bbb0d96 mm/kmemleak.c: wa... |
1654 |
* Stop the automatic memory scanning thread. |
3c7b4e6b8 kmemleak: Add the... |
1655 |
*/ |
7eb0d5e5b kmemleak: fix spa... |
1656 |
static void stop_scan_thread(void) |
3c7b4e6b8 kmemleak: Add the... |
1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 |
{ if (scan_thread) { kthread_stop(scan_thread); scan_thread = NULL; } } /* * Iterate over the object_list and return the first valid object at or after * the required position with its use_count incremented. The function triggers * a memory scanning when the pos argument points to the first position. */ static void *kmemleak_seq_start(struct seq_file *seq, loff_t *pos) { struct kmemleak_object *object; loff_t n = *pos; |
b87324d08 kmemleak: Do not ... |
1673 1674 1675 1676 1677 |
int err; err = mutex_lock_interruptible(&scan_mutex); if (err < 0) return ERR_PTR(err); |
3c7b4e6b8 kmemleak: Add the... |
1678 |
|
3c7b4e6b8 kmemleak: Add the... |
1679 1680 1681 1682 1683 1684 1685 1686 1687 |
rcu_read_lock(); list_for_each_entry_rcu(object, &object_list, object_list) { if (n-- > 0) continue; if (get_object(object)) goto out; } object = NULL; out: |
3c7b4e6b8 kmemleak: Add the... |
1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 |
return object; } /* * Return the next object in the object_list. The function decrements the * use_count of the previous object and increases that of the next one. */ static void *kmemleak_seq_next(struct seq_file *seq, void *v, loff_t *pos) { struct kmemleak_object *prev_obj = v; struct kmemleak_object *next_obj = NULL; |
58fac0956 kmemleak: Replace... |
1699 |
struct kmemleak_object *obj = prev_obj; |
3c7b4e6b8 kmemleak: Add the... |
1700 1701 |
++(*pos); |
3c7b4e6b8 kmemleak: Add the... |
1702 |
|
58fac0956 kmemleak: Replace... |
1703 |
list_for_each_entry_continue_rcu(obj, &object_list, object_list) { |
52c3ce4ec kmemleak: Do not ... |
1704 1705 |
if (get_object(obj)) { next_obj = obj; |
3c7b4e6b8 kmemleak: Add the... |
1706 |
break; |
52c3ce4ec kmemleak: Do not ... |
1707 |
} |
3c7b4e6b8 kmemleak: Add the... |
1708 |
} |
288c857d6 kmemleak: Remove ... |
1709 |
|
3c7b4e6b8 kmemleak: Add the... |
1710 1711 1712 1713 1714 1715 1716 1717 1718 |
put_object(prev_obj); return next_obj; } /* * Decrement the use_count of the last object required, if any. */ static void kmemleak_seq_stop(struct seq_file *seq, void *v) { |
b87324d08 kmemleak: Do not ... |
1719 1720 1721 1722 1723 |
if (!IS_ERR(v)) { /* * kmemleak_seq_start may return ERR_PTR if the scan_mutex * waiting was interrupted, so only release it if !IS_ERR. */ |
f5886c7f9 kmemleak: Protect... |
1724 |
rcu_read_unlock(); |
b87324d08 kmemleak: Do not ... |
1725 1726 1727 1728 |
mutex_unlock(&scan_mutex); if (v) put_object(v); } |
3c7b4e6b8 kmemleak: Add the... |
1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 |
} /* * Print the information for an unreferenced object to the seq file. */ static int kmemleak_seq_show(struct seq_file *seq, void *v) { struct kmemleak_object *object = v; unsigned long flags; spin_lock_irqsave(&object->lock, flags); |
288c857d6 kmemleak: Remove ... |
1740 |
if ((object->flags & OBJECT_REPORTED) && unreferenced_object(object)) |
17bb9e0d9 kmemleak: Do not ... |
1741 |
print_unreferenced(seq, object); |
3c7b4e6b8 kmemleak: Add the... |
1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 |
spin_unlock_irqrestore(&object->lock, flags); return 0; } static const struct seq_operations kmemleak_seq_ops = { .start = kmemleak_seq_start, .next = kmemleak_seq_next, .stop = kmemleak_seq_stop, .show = kmemleak_seq_show, }; static int kmemleak_open(struct inode *inode, struct file *file) { |
b87324d08 kmemleak: Do not ... |
1755 |
return seq_open(file, &kmemleak_seq_ops); |
3c7b4e6b8 kmemleak: Add the... |
1756 |
} |
189d84ed5 kmemleak: Dump ob... |
1757 1758 1759 1760 1761 |
static int dump_str_object_info(const char *str) { unsigned long flags; struct kmemleak_object *object; unsigned long addr; |
dc053733e mm/kmemleak.c: re... |
1762 1763 |
if (kstrtoul(str, 0, &addr)) return -EINVAL; |
189d84ed5 kmemleak: Dump ob... |
1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 |
object = find_and_get_object(addr, 0); if (!object) { pr_info("Unknown object at 0x%08lx ", addr); return -EINVAL; } spin_lock_irqsave(&object->lock, flags); dump_object_info(object); spin_unlock_irqrestore(&object->lock, flags); put_object(object); return 0; } |
3c7b4e6b8 kmemleak: Add the... |
1778 |
/* |
30b371010 kmemleak: add cle... |
1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 |
* We use grey instead of black to ensure we can do future scans on the same * objects. If we did not do future scans these black objects could * potentially contain references to newly allocated objects in the future and * we'd end up with false positives. */ static void kmemleak_clear(void) { struct kmemleak_object *object; unsigned long flags; rcu_read_lock(); list_for_each_entry_rcu(object, &object_list, object_list) { spin_lock_irqsave(&object->lock, flags); if ((object->flags & OBJECT_REPORTED) && unreferenced_object(object)) |
a1084c877 kmemleak: move co... |
1794 |
__paint_it(object, KMEMLEAK_GREY); |
30b371010 kmemleak: add cle... |
1795 1796 1797 |
spin_unlock_irqrestore(&object->lock, flags); } rcu_read_unlock(); |
dc9b3f424 kmemleak: free in... |
1798 1799 |
kmemleak_found_leaks = false; |
30b371010 kmemleak: add cle... |
1800 |
} |
c89da70c7 kmemleak: allow f... |
1801 |
static void __kmemleak_do_cleanup(void); |
30b371010 kmemleak: add cle... |
1802 |
/* |
3c7b4e6b8 kmemleak: Add the... |
1803 1804 1805 1806 1807 1808 1809 1810 1811 |
* File write operation to configure kmemleak at run-time. The following * commands can be written to the /sys/kernel/debug/kmemleak file: * off - disable kmemleak (irreversible) * stack=on - enable the task stacks scanning * stack=off - disable the tasks stacks scanning * scan=on - start the automatic memory scanning thread * scan=off - stop the automatic memory scanning thread * scan=... - set the automatic memory scanning period in seconds (0 to * disable it) |
4698c1f2b kmemleak: Do not ... |
1812 |
* scan - trigger a memory scan |
30b371010 kmemleak: add cle... |
1813 |
* clear - mark all current reported unreferenced kmemleak objects as |
c89da70c7 kmemleak: allow f... |
1814 1815 |
* grey to ignore printing them, or free all kmemleak objects * if kmemleak has been disabled. |
189d84ed5 kmemleak: Dump ob... |
1816 |
* dump=... - dump information about the object found at the given address |
3c7b4e6b8 kmemleak: Add the... |
1817 1818 1819 1820 1821 1822 |
*/ static ssize_t kmemleak_write(struct file *file, const char __user *user_buf, size_t size, loff_t *ppos) { char buf[64]; int buf_size; |
b87324d08 kmemleak: Do not ... |
1823 |
int ret; |
3c7b4e6b8 kmemleak: Add the... |
1824 1825 1826 1827 1828 |
buf_size = min(size, (sizeof(buf) - 1)); if (strncpy_from_user(buf, user_buf, buf_size) < 0) return -EFAULT; buf[buf_size] = 0; |
b87324d08 kmemleak: Do not ... |
1829 1830 1831 |
ret = mutex_lock_interruptible(&scan_mutex); if (ret < 0) return ret; |
c89da70c7 kmemleak: allow f... |
1832 |
if (strncmp(buf, "clear", 5) == 0) { |
8910ae896 kmemleak: change ... |
1833 |
if (kmemleak_enabled) |
c89da70c7 kmemleak: allow f... |
1834 1835 1836 1837 1838 |
kmemleak_clear(); else __kmemleak_do_cleanup(); goto out; } |
8910ae896 kmemleak: change ... |
1839 |
if (!kmemleak_enabled) { |
c89da70c7 kmemleak: allow f... |
1840 1841 1842 |
ret = -EBUSY; goto out; } |
3c7b4e6b8 kmemleak: Add the... |
1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 |
if (strncmp(buf, "off", 3) == 0) kmemleak_disable(); else if (strncmp(buf, "stack=on", 8) == 0) kmemleak_stack_scan = 1; else if (strncmp(buf, "stack=off", 9) == 0) kmemleak_stack_scan = 0; else if (strncmp(buf, "scan=on", 7) == 0) start_scan_thread(); else if (strncmp(buf, "scan=off", 8) == 0) stop_scan_thread(); else if (strncmp(buf, "scan=", 5) == 0) { unsigned long secs; |
3c7b4e6b8 kmemleak: Add the... |
1855 |
|
3dbb95f78 mm: replace stric... |
1856 |
ret = kstrtoul(buf + 5, 0, &secs); |
b87324d08 kmemleak: Do not ... |
1857 1858 |
if (ret < 0) goto out; |
3c7b4e6b8 kmemleak: Add the... |
1859 1860 1861 1862 1863 |
stop_scan_thread(); if (secs) { jiffies_scan_wait = msecs_to_jiffies(secs * 1000); start_scan_thread(); } |
4698c1f2b kmemleak: Do not ... |
1864 1865 |
} else if (strncmp(buf, "scan", 4) == 0) kmemleak_scan(); |
189d84ed5 kmemleak: Dump ob... |
1866 1867 |
else if (strncmp(buf, "dump=", 5) == 0) ret = dump_str_object_info(buf + 5); |
4698c1f2b kmemleak: Do not ... |
1868 |
else |
b87324d08 kmemleak: Do not ... |
1869 1870 1871 1872 1873 1874 |
ret = -EINVAL; out: mutex_unlock(&scan_mutex); if (ret < 0) return ret; |
3c7b4e6b8 kmemleak: Add the... |
1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 |
/* ignore the rest of the buffer, only one command at a time */ *ppos += size; return size; } static const struct file_operations kmemleak_fops = { .owner = THIS_MODULE, .open = kmemleak_open, .read = seq_read, .write = kmemleak_write, .llseek = seq_lseek, |
5f3bf19ae kmemleak: remove ... |
1887 |
.release = seq_release, |
3c7b4e6b8 kmemleak: Add the... |
1888 |
}; |
c89da70c7 kmemleak: allow f... |
1889 1890 1891 1892 1893 1894 1895 1896 1897 |
static void __kmemleak_do_cleanup(void) { struct kmemleak_object *object; rcu_read_lock(); list_for_each_entry_rcu(object, &object_list, object_list) delete_object_full(object->pointer); rcu_read_unlock(); } |
3c7b4e6b8 kmemleak: Add the... |
1898 |
/* |
74341703e kmemleak: Report ... |
1899 1900 1901 |
* Stop the memory scanning thread and free the kmemleak internal objects if * no previous scan thread (otherwise, kmemleak may still have some useful * information on memory leaks). |
3c7b4e6b8 kmemleak: Add the... |
1902 |
*/ |
179a8100e kmemleak: Do no c... |
1903 |
static void kmemleak_do_cleanup(struct work_struct *work) |
3c7b4e6b8 kmemleak: Add the... |
1904 |
{ |
3c7b4e6b8 kmemleak: Add the... |
1905 |
stop_scan_thread(); |
3c7b4e6b8 kmemleak: Add the... |
1906 |
|
28bbb0d96 mm/kmemleak.c: wa... |
1907 |
mutex_lock(&scan_mutex); |
c5f3b1a51 mm: kmemleak: all... |
1908 |
/* |
28bbb0d96 mm/kmemleak.c: wa... |
1909 1910 1911 1912 |
* Once it is made sure that kmemleak_scan has stopped, it is safe to no * longer track object freeing. Ordering of the scan thread stopping and * the memory accesses below is guaranteed by the kthread_stop() * function. |
c5f3b1a51 mm: kmemleak: all... |
1913 1914 |
*/ kmemleak_free_enabled = 0; |
28bbb0d96 mm/kmemleak.c: wa... |
1915 |
mutex_unlock(&scan_mutex); |
c5f3b1a51 mm: kmemleak: all... |
1916 |
|
c89da70c7 kmemleak: allow f... |
1917 1918 1919 |
if (!kmemleak_found_leaks) __kmemleak_do_cleanup(); else |
756a025f0 mm: coalesce spli... |
1920 1921 |
pr_info("Kmemleak disabled without freeing internal data. Reclaim the memory with \"echo clear > /sys/kernel/debug/kmemleak\". "); |
3c7b4e6b8 kmemleak: Add the... |
1922 |
} |
179a8100e kmemleak: Do no c... |
1923 |
static DECLARE_WORK(cleanup_work, kmemleak_do_cleanup); |
3c7b4e6b8 kmemleak: Add the... |
1924 1925 1926 1927 1928 1929 1930 1931 |
/* * Disable kmemleak. No memory allocation/freeing will be traced once this * function is called. Disabling kmemleak is an irreversible operation. */ static void kmemleak_disable(void) { /* atomically check whether it was already invoked */ |
8910ae896 kmemleak: change ... |
1932 |
if (cmpxchg(&kmemleak_error, 0, 1)) |
3c7b4e6b8 kmemleak: Add the... |
1933 1934 1935 |
return; /* stop any memory operation tracing */ |
8910ae896 kmemleak: change ... |
1936 |
kmemleak_enabled = 0; |
3c7b4e6b8 kmemleak: Add the... |
1937 1938 |
/* check whether it is too early for a kernel thread */ |
8910ae896 kmemleak: change ... |
1939 |
if (kmemleak_initialized) |
179a8100e kmemleak: Do no c... |
1940 |
schedule_work(&cleanup_work); |
c5f3b1a51 mm: kmemleak: all... |
1941 1942 |
else kmemleak_free_enabled = 0; |
3c7b4e6b8 kmemleak: Add the... |
1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 |
pr_info("Kernel memory leak detector disabled "); } /* * Allow boot-time kmemleak disabling (enabled by default). */ static int kmemleak_boot_config(char *str) { if (!str) return -EINVAL; if (strcmp(str, "off") == 0) kmemleak_disable(); |
ab0155a22 kmemleak: Introdu... |
1957 1958 1959 |
else if (strcmp(str, "on") == 0) kmemleak_skip_disable = 1; else |
3c7b4e6b8 kmemleak: Add the... |
1960 1961 1962 1963 |
return -EINVAL; return 0; } early_param("kmemleak", kmemleak_boot_config); |
5f79020cb kmemleak: Show wh... |
1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 |
static void __init print_log_trace(struct early_log *log) { struct stack_trace trace; trace.nr_entries = log->trace_len; trace.entries = log->trace; pr_notice("Early log backtrace: "); print_stack_trace(&trace, 2); } |
3c7b4e6b8 kmemleak: Add the... |
1975 |
/* |
2030117d2 kmemleak: Fix som... |
1976 |
* Kmemleak initialization. |
3c7b4e6b8 kmemleak: Add the... |
1977 1978 1979 1980 1981 |
*/ void __init kmemleak_init(void) { int i; unsigned long flags; |
ab0155a22 kmemleak: Introdu... |
1982 1983 |
#ifdef CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF if (!kmemleak_skip_disable) { |
3551a9280 mm: postpone the ... |
1984 |
kmemleak_early_log = 0; |
ab0155a22 kmemleak: Introdu... |
1985 1986 1987 1988 |
kmemleak_disable(); return; } #endif |
3c7b4e6b8 kmemleak: Add the... |
1989 1990 1991 1992 1993 |
jiffies_min_age = msecs_to_jiffies(MSECS_MIN_AGE); jiffies_scan_wait = msecs_to_jiffies(SECS_SCAN_WAIT * 1000); object_cache = KMEM_CACHE(kmemleak_object, SLAB_NOLEAKTRACE); scan_area_cache = KMEM_CACHE(kmemleak_scan_area, SLAB_NOLEAKTRACE); |
3c7b4e6b8 kmemleak: Add the... |
1994 |
|
21cd3a604 kmemleak: record ... |
1995 |
if (crt_early_log > ARRAY_SIZE(early_log)) |
598d80914 mm: convert pr_wa... |
1996 1997 1998 |
pr_warn("Early log buffer exceeded (%d), please increase DEBUG_KMEMLEAK_EARLY_LOG_SIZE ", crt_early_log); |
b66930052 kmemleak: When th... |
1999 |
|
3c7b4e6b8 kmemleak: Add the... |
2000 2001 |
/* the kernel is still in UP mode, so disabling the IRQs is enough */ local_irq_save(flags); |
3551a9280 mm: postpone the ... |
2002 |
kmemleak_early_log = 0; |
8910ae896 kmemleak: change ... |
2003 |
if (kmemleak_error) { |
b66930052 kmemleak: When th... |
2004 2005 |
local_irq_restore(flags); return; |
c5f3b1a51 mm: kmemleak: all... |
2006 |
} else { |
8910ae896 kmemleak: change ... |
2007 |
kmemleak_enabled = 1; |
c5f3b1a51 mm: kmemleak: all... |
2008 2009 |
kmemleak_free_enabled = 1; } |
3c7b4e6b8 kmemleak: Add the... |
2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 |
local_irq_restore(flags); /* * This is the point where tracking allocations is safe. Automatic * scanning is started during the late initcall. Add the early logged * callbacks to the kmemleak infrastructure. */ for (i = 0; i < crt_early_log; i++) { struct early_log *log = &early_log[i]; switch (log->op_type) { case KMEMLEAK_ALLOC: |
fd6789675 kmemleak: Save th... |
2022 |
early_alloc(log); |
3c7b4e6b8 kmemleak: Add the... |
2023 |
break; |
f528f0b8e kmemleak: Handle ... |
2024 2025 2026 |
case KMEMLEAK_ALLOC_PERCPU: early_alloc_percpu(log); break; |
3c7b4e6b8 kmemleak: Add the... |
2027 2028 2029 |
case KMEMLEAK_FREE: kmemleak_free(log->ptr); break; |
53238a60d kmemleak: Allow p... |
2030 2031 2032 |
case KMEMLEAK_FREE_PART: kmemleak_free_part(log->ptr, log->size); break; |
f528f0b8e kmemleak: Handle ... |
2033 2034 2035 |
case KMEMLEAK_FREE_PERCPU: kmemleak_free_percpu(log->ptr); break; |
3c7b4e6b8 kmemleak: Add the... |
2036 2037 2038 2039 2040 2041 2042 |
case KMEMLEAK_NOT_LEAK: kmemleak_not_leak(log->ptr); break; case KMEMLEAK_IGNORE: kmemleak_ignore(log->ptr); break; case KMEMLEAK_SCAN_AREA: |
c017b4be3 kmemleak: Simplif... |
2043 |
kmemleak_scan_area(log->ptr, log->size, GFP_KERNEL); |
3c7b4e6b8 kmemleak: Add the... |
2044 2045 2046 2047 |
break; case KMEMLEAK_NO_SCAN: kmemleak_no_scan(log->ptr); break; |
94f4a1618 mm: kmemleak: tre... |
2048 2049 2050 2051 |
case KMEMLEAK_SET_EXCESS_REF: object_set_excess_ref((unsigned long)log->ptr, log->excess_ref); break; |
3c7b4e6b8 kmemleak: Add the... |
2052 |
default: |
5f79020cb kmemleak: Show wh... |
2053 2054 2055 2056 |
kmemleak_warn("Unknown early log operation: %d ", log->op_type); } |
8910ae896 kmemleak: change ... |
2057 |
if (kmemleak_warning) { |
5f79020cb kmemleak: Show wh... |
2058 |
print_log_trace(log); |
8910ae896 kmemleak: change ... |
2059 |
kmemleak_warning = 0; |
3c7b4e6b8 kmemleak: Add the... |
2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 |
} } } /* * Late initialization function. */ static int __init kmemleak_late_init(void) { struct dentry *dentry; |
8910ae896 kmemleak: change ... |
2070 |
kmemleak_initialized = 1; |
3c7b4e6b8 kmemleak: Add the... |
2071 |
|
8910ae896 kmemleak: change ... |
2072 |
if (kmemleak_error) { |
3c7b4e6b8 kmemleak: Add the... |
2073 |
/* |
25985edce Fix common misspe... |
2074 |
* Some error occurred and kmemleak was disabled. There is a |
3c7b4e6b8 kmemleak: Add the... |
2075 2076 2077 2078 |
* small chance that kmemleak_disable() was called immediately * after setting kmemleak_initialized and we may end up with * two clean-up threads but serialized by scan_mutex. */ |
179a8100e kmemleak: Do no c... |
2079 |
schedule_work(&cleanup_work); |
3c7b4e6b8 kmemleak: Add the... |
2080 2081 2082 2083 2084 2085 |
return -ENOMEM; } dentry = debugfs_create_file("kmemleak", S_IRUGO, NULL, NULL, &kmemleak_fops); if (!dentry) |
598d80914 mm: convert pr_wa... |
2086 2087 |
pr_warn("Failed to create the debugfs kmemleak file "); |
4698c1f2b kmemleak: Do not ... |
2088 |
mutex_lock(&scan_mutex); |
3c7b4e6b8 kmemleak: Add the... |
2089 |
start_scan_thread(); |
4698c1f2b kmemleak: Do not ... |
2090 |
mutex_unlock(&scan_mutex); |
3c7b4e6b8 kmemleak: Add the... |
2091 2092 2093 2094 2095 2096 2097 |
pr_info("Kernel memory leak detector initialized "); return 0; } late_initcall(kmemleak_late_init); |