summaryrefslogtreecommitdiffstats
path: root/talloc.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--talloc.c3070
1 files changed, 3070 insertions, 0 deletions
diff --git a/talloc.c b/talloc.c
new file mode 100644
index 0000000..3a93a82
--- /dev/null
+++ b/talloc.c
@@ -0,0 +1,3070 @@
+/*
+ Samba Unix SMB/CIFS implementation.
+
+ Samba trivial allocation library - new interface
+
+ NOTE: Please read talloc_guide.txt for full documentation
+
+ Copyright (C) Andrew Tridgell 2004
+ Copyright (C) Stefan Metzmacher 2006
+
+ ** NOTE! The following LGPL license applies to the talloc
+ ** library. This does NOT imply that all of Samba is released
+ ** under the LGPL
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 3 of the License, or (at your option) any later version.
+
+ This library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+/*
+ inspired by http://swapped.cc/halloc/
+*/
+
+#include "replace.h"
+#include "talloc.h"
+
+#ifdef HAVE_SYS_AUXV_H
+#include <sys/auxv.h>
+#endif
+
+#if (TALLOC_VERSION_MAJOR != TALLOC_BUILD_VERSION_MAJOR)
+#error "TALLOC_VERSION_MAJOR != TALLOC_BUILD_VERSION_MAJOR"
+#endif
+
+#if (TALLOC_VERSION_MINOR != TALLOC_BUILD_VERSION_MINOR)
+#error "TALLOC_VERSION_MINOR != TALLOC_BUILD_VERSION_MINOR"
+#endif
+
+/* Special macros that are no-ops except when run under Valgrind on
+ * x86. They've moved a little bit from valgrind 1.0.4 to 1.9.4 */
+#ifdef HAVE_VALGRIND_MEMCHECK_H
+ /* memcheck.h includes valgrind.h */
+#include <valgrind/memcheck.h>
+#elif defined(HAVE_VALGRIND_H)
+#include <valgrind.h>
+#endif
+
+#define MAX_TALLOC_SIZE 0x10000000
+
+#define TALLOC_FLAG_FREE 0x01
+#define TALLOC_FLAG_LOOP 0x02
+#define TALLOC_FLAG_POOL 0x04 /* This is a talloc pool */
+#define TALLOC_FLAG_POOLMEM 0x08 /* This is allocated in a pool */
+
+/*
+ * Bits above this are random, used to make it harder to fake talloc
+ * headers during an attack. Try not to change this without good reason.
+ */
+#define TALLOC_FLAG_MASK 0x0F
+
+#define TALLOC_MAGIC_REFERENCE ((const char *)1)
+
+#define TALLOC_MAGIC_BASE 0xe814ec70
+#define TALLOC_MAGIC_NON_RANDOM ( \
+ ~TALLOC_FLAG_MASK & ( \
+ TALLOC_MAGIC_BASE + \
+ (TALLOC_BUILD_VERSION_MAJOR << 24) + \
+ (TALLOC_BUILD_VERSION_MINOR << 16) + \
+ (TALLOC_BUILD_VERSION_RELEASE << 8)))
+static unsigned int talloc_magic = TALLOC_MAGIC_NON_RANDOM;
+
+/* by default we abort when given a bad pointer (such as when talloc_free() is called
+ on a pointer that came from malloc() */
+#ifndef TALLOC_ABORT
+#define TALLOC_ABORT(reason) abort()
+#endif
+
+#ifndef discard_const_p
+#if defined(__intptr_t_defined) || defined(HAVE_INTPTR_T)
+# define discard_const_p(type, ptr) ((type *)((intptr_t)(ptr)))
+#else
+# define discard_const_p(type, ptr) ((type *)(ptr))
+#endif
+#endif
+
+/* these macros gain us a few percent of speed on gcc */
+#if (__GNUC__ >= 3)
+/* the strange !! is to ensure that __builtin_expect() takes either 0 or 1
+ as its first argument */
+#ifndef likely
+#define likely(x) __builtin_expect(!!(x), 1)
+#endif
+#ifndef unlikely
+#define unlikely(x) __builtin_expect(!!(x), 0)
+#endif
+#else
+#ifndef likely
+#define likely(x) (x)
+#endif
+#ifndef unlikely
+#define unlikely(x) (x)
+#endif
+#endif
+
+/* this null_context is only used if talloc_enable_leak_report() or
+ talloc_enable_leak_report_full() is called, otherwise it remains
+ NULL
+*/
+static void *null_context;
+static bool talloc_report_null;
+static bool talloc_report_null_full;
+static void *autofree_context;
+
+static void talloc_setup_atexit(void);
+
+/* used to enable fill of memory on free, which can be useful for
+ * catching use after free errors when valgrind is too slow
+ */
+static struct {
+ bool initialised;
+ bool enabled;
+ uint8_t fill_value;
+} talloc_fill;
+
+#define TALLOC_FILL_ENV "TALLOC_FREE_FILL"
+
+/*
+ * do not wipe the header, to allow the
+ * double-free logic to still work
+ */
+#define TC_INVALIDATE_FULL_FILL_CHUNK(_tc) do { \
+ if (unlikely(talloc_fill.enabled)) { \
+ size_t _flen = (_tc)->size; \
+ char *_fptr = (char *)TC_PTR_FROM_CHUNK(_tc); \
+ memset(_fptr, talloc_fill.fill_value, _flen); \
+ } \
+} while (0)
+
+#if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_NOACCESS)
+/* Mark the whole chunk as not accessible */
+#define TC_INVALIDATE_FULL_VALGRIND_CHUNK(_tc) do { \
+ size_t _flen = TC_HDR_SIZE + (_tc)->size; \
+ char *_fptr = (char *)(_tc); \
+ VALGRIND_MAKE_MEM_NOACCESS(_fptr, _flen); \
+} while(0)
+#else
+#define TC_INVALIDATE_FULL_VALGRIND_CHUNK(_tc) do { } while (0)
+#endif
+
+#define TC_INVALIDATE_FULL_CHUNK(_tc) do { \
+ TC_INVALIDATE_FULL_FILL_CHUNK(_tc); \
+ TC_INVALIDATE_FULL_VALGRIND_CHUNK(_tc); \
+} while (0)
+
+#define TC_INVALIDATE_SHRINK_FILL_CHUNK(_tc, _new_size) do { \
+ if (unlikely(talloc_fill.enabled)) { \
+ size_t _flen = (_tc)->size - (_new_size); \
+ char *_fptr = (char *)TC_PTR_FROM_CHUNK(_tc); \
+ _fptr += (_new_size); \
+ memset(_fptr, talloc_fill.fill_value, _flen); \
+ } \
+} while (0)
+
+#if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_NOACCESS)
+/* Mark the unused bytes not accessible */
+#define TC_INVALIDATE_SHRINK_VALGRIND_CHUNK(_tc, _new_size) do { \
+ size_t _flen = (_tc)->size - (_new_size); \
+ char *_fptr = (char *)TC_PTR_FROM_CHUNK(_tc); \
+ _fptr += (_new_size); \
+ VALGRIND_MAKE_MEM_NOACCESS(_fptr, _flen); \
+} while (0)
+#else
+#define TC_INVALIDATE_SHRINK_VALGRIND_CHUNK(_tc, _new_size) do { } while (0)
+#endif
+
+#define TC_INVALIDATE_SHRINK_CHUNK(_tc, _new_size) do { \
+ TC_INVALIDATE_SHRINK_FILL_CHUNK(_tc, _new_size); \
+ TC_INVALIDATE_SHRINK_VALGRIND_CHUNK(_tc, _new_size); \
+} while (0)
+
+#define TC_UNDEFINE_SHRINK_FILL_CHUNK(_tc, _new_size) do { \
+ if (unlikely(talloc_fill.enabled)) { \
+ size_t _flen = (_tc)->size - (_new_size); \
+ char *_fptr = (char *)TC_PTR_FROM_CHUNK(_tc); \
+ _fptr += (_new_size); \
+ memset(_fptr, talloc_fill.fill_value, _flen); \
+ } \
+} while (0)
+
+#if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_UNDEFINED)
+/* Mark the unused bytes as undefined */
+#define TC_UNDEFINE_SHRINK_VALGRIND_CHUNK(_tc, _new_size) do { \
+ size_t _flen = (_tc)->size - (_new_size); \
+ char *_fptr = (char *)TC_PTR_FROM_CHUNK(_tc); \
+ _fptr += (_new_size); \
+ VALGRIND_MAKE_MEM_UNDEFINED(_fptr, _flen); \
+} while (0)
+#else
+#define TC_UNDEFINE_SHRINK_VALGRIND_CHUNK(_tc, _new_size) do { } while (0)
+#endif
+
+#define TC_UNDEFINE_SHRINK_CHUNK(_tc, _new_size) do { \
+ TC_UNDEFINE_SHRINK_FILL_CHUNK(_tc, _new_size); \
+ TC_UNDEFINE_SHRINK_VALGRIND_CHUNK(_tc, _new_size); \
+} while (0)
+
+#if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_UNDEFINED)
+/* Mark the new bytes as undefined */
+#define TC_UNDEFINE_GROW_VALGRIND_CHUNK(_tc, _new_size) do { \
+ size_t _old_used = TC_HDR_SIZE + (_tc)->size; \
+ size_t _new_used = TC_HDR_SIZE + (_new_size); \
+ size_t _flen = _new_used - _old_used; \
+ char *_fptr = _old_used + (char *)(_tc); \
+ VALGRIND_MAKE_MEM_UNDEFINED(_fptr, _flen); \
+} while (0)
+#else
+#define TC_UNDEFINE_GROW_VALGRIND_CHUNK(_tc, _new_size) do { } while (0)
+#endif
+
+#define TC_UNDEFINE_GROW_CHUNK(_tc, _new_size) do { \
+ TC_UNDEFINE_GROW_VALGRIND_CHUNK(_tc, _new_size); \
+} while (0)
+
+struct talloc_reference_handle {
+ struct talloc_reference_handle *next, *prev;
+ void *ptr;
+ const char *location;
+};
+
+struct talloc_memlimit {
+ struct talloc_chunk *parent;
+ struct talloc_memlimit *upper;
+ size_t max_size;
+ size_t cur_size;
+};
+
+static inline bool talloc_memlimit_check(struct talloc_memlimit *limit, size_t size);
+static inline void talloc_memlimit_grow(struct talloc_memlimit *limit,
+ size_t size);
+static inline void talloc_memlimit_shrink(struct talloc_memlimit *limit,
+ size_t size);
+static inline void tc_memlimit_update_on_free(struct talloc_chunk *tc);
+
+static inline void _tc_set_name_const(struct talloc_chunk *tc,
+ const char *name);
+static struct talloc_chunk *_vasprintf_tc(const void *t,
+ const char *fmt,
+ va_list ap);
+
+typedef int (*talloc_destructor_t)(void *);
+
+struct talloc_pool_hdr;
+
+struct talloc_chunk {
+ /*
+ * flags includes the talloc magic, which is randomised to
+ * make overwrite attacks harder
+ */
+ unsigned flags;
+
+ /*
+ * If you have a logical tree like:
+ *
+ * <parent>
+ * / | \
+ * / | \
+ * / | \
+ * <child 1> <child 2> <child 3>
+ *
+ * The actual talloc tree is:
+ *
+ * <parent>
+ * |
+ * <child 1> - <child 2> - <child 3>
+ *
+ * The children are linked with next/prev pointers, and
+ * child 1 is linked to the parent with parent/child
+ * pointers.
+ */
+
+ struct talloc_chunk *next, *prev;
+ struct talloc_chunk *parent, *child;
+ struct talloc_reference_handle *refs;
+ talloc_destructor_t destructor;
+ const char *name;
+ size_t size;
+
+ /*
+ * limit semantics:
+ * if 'limit' is set it means all *new* children of the context will
+ * be limited to a total aggregate size ox max_size for memory
+ * allocations.
+ * cur_size is used to keep track of the current use
+ */
+ struct talloc_memlimit *limit;
+
+ /*
+ * For members of a pool (i.e. TALLOC_FLAG_POOLMEM is set), "pool"
+ * is a pointer to the struct talloc_chunk of the pool that it was
+ * allocated from. This way children can quickly find the pool to chew
+ * from.
+ */
+ struct talloc_pool_hdr *pool;
+};
+
+union talloc_chunk_cast_u {
+ uint8_t *ptr;
+ struct talloc_chunk *chunk;
+};
+
+/* 16 byte alignment seems to keep everyone happy */
+#define TC_ALIGN16(s) (((s)+15)&~15)
+#define TC_HDR_SIZE TC_ALIGN16(sizeof(struct talloc_chunk))
+#define TC_PTR_FROM_CHUNK(tc) ((void *)(TC_HDR_SIZE + (char*)tc))
+
+_PUBLIC_ int talloc_version_major(void)
+{
+ return TALLOC_VERSION_MAJOR;
+}
+
+_PUBLIC_ int talloc_version_minor(void)
+{
+ return TALLOC_VERSION_MINOR;
+}
+
+_PUBLIC_ int talloc_test_get_magic(void)
+{
+ return talloc_magic;
+}
+
+static inline void _talloc_chunk_set_free(struct talloc_chunk *tc,
+ const char *location)
+{
+ /*
+ * Mark this memory as free, and also over-stamp the talloc
+ * magic with the old-style magic.
+ *
+ * Why? This tries to avoid a memory read use-after-free from
+ * disclosing our talloc magic, which would then allow an
+ * attacker to prepare a valid header and so run a destructor.
+ *
+ */
+ tc->flags = TALLOC_MAGIC_NON_RANDOM | TALLOC_FLAG_FREE
+ | (tc->flags & TALLOC_FLAG_MASK);
+
+ /* we mark the freed memory with where we called the free
+ * from. This means on a double free error we can report where
+ * the first free came from
+ */
+ if (location) {
+ tc->name = location;
+ }
+}
+
+static inline void _talloc_chunk_set_not_free(struct talloc_chunk *tc)
+{
+ /*
+ * Mark this memory as not free.
+ *
+ * Why? This is memory either in a pool (and so available for
+ * talloc's re-use or after the realloc(). We need to mark
+ * the memory as free() before any realloc() call as we can't
+ * write to the memory after that.
+ *
+ * We put back the normal magic instead of the 'not random'
+ * magic.
+ */
+
+ tc->flags = talloc_magic |
+ ((tc->flags & TALLOC_FLAG_MASK) & ~TALLOC_FLAG_FREE);
+}
+
+static void (*talloc_log_fn)(const char *message);
+
+_PUBLIC_ void talloc_set_log_fn(void (*log_fn)(const char *message))
+{
+ talloc_log_fn = log_fn;
+}
+
+#ifdef HAVE_CONSTRUCTOR_ATTRIBUTE
+#define CONSTRUCTOR __attribute__((constructor))
+#elif defined(HAVE_PRAGMA_INIT)
+#define CONSTRUCTOR
+#pragma init (talloc_lib_init)
+#endif
+#if defined(HAVE_CONSTRUCTOR_ATTRIBUTE) || defined(HAVE_PRAGMA_INIT)
+void talloc_lib_init(void) CONSTRUCTOR;
+void talloc_lib_init(void)
+{
+ uint32_t random_value;
+#if defined(HAVE_GETAUXVAL) && defined(AT_RANDOM)
+ uint8_t *p;
+ /*
+ * Use the kernel-provided random values used for
+ * ASLR. This won't change per-exec, which is ideal for us
+ */
+ p = (uint8_t *) getauxval(AT_RANDOM);
+ if (p) {
+ /*
+ * We get 16 bytes from getauxval. By calling rand(),
+ * a totally insecure PRNG, but one that will
+ * deterministically have a different value when called
+ * twice, we ensure that if two talloc-like libraries
+ * are somehow loaded in the same address space, that
+ * because we choose different bytes, we will keep the
+ * protection against collision of multiple talloc
+ * libs.
+ *
+ * This protection is important because the effects of
+ * passing a talloc pointer from one to the other may
+ * be very hard to determine.
+ */
+ int offset = rand() % (16 - sizeof(random_value));
+ memcpy(&random_value, p + offset, sizeof(random_value));
+ } else
+#endif
+ {
+ /*
+ * Otherwise, hope the location we are loaded in
+ * memory is randomised by someone else
+ */
+ random_value = ((uintptr_t)talloc_lib_init & 0xFFFFFFFF);
+ }
+ talloc_magic = random_value & ~TALLOC_FLAG_MASK;
+}
+#else
+#warning "No __attribute__((constructor)) support found on this platform, additional talloc security measures not available"
+#endif
+
+static void talloc_lib_atexit(void)
+{
+ TALLOC_FREE(autofree_context);
+
+ if (talloc_total_size(null_context) == 0) {
+ return;
+ }
+
+ if (talloc_report_null_full) {
+ talloc_report_full(null_context, stderr);
+ } else if (talloc_report_null) {
+ talloc_report(null_context, stderr);
+ }
+}
+
+static void talloc_setup_atexit(void)
+{
+ static bool done;
+
+ if (done) {
+ return;
+ }
+
+ atexit(talloc_lib_atexit);
+ done = true;
+}
+
+static void talloc_log(const char *fmt, ...) PRINTF_ATTRIBUTE(1,2);
+static void talloc_log(const char *fmt, ...)
+{
+ va_list ap;
+ char *message;
+
+ if (!talloc_log_fn) {
+ return;
+ }
+
+ va_start(ap, fmt);
+ message = talloc_vasprintf(NULL, fmt, ap);
+ va_end(ap);
+
+ talloc_log_fn(message);
+ talloc_free(message);
+}
+
+static void talloc_log_stderr(const char *message)
+{
+ fprintf(stderr, "%s", message);
+}
+
+_PUBLIC_ void talloc_set_log_stderr(void)
+{
+ talloc_set_log_fn(talloc_log_stderr);
+}
+
+static void (*talloc_abort_fn)(const char *reason);
+
+_PUBLIC_ void talloc_set_abort_fn(void (*abort_fn)(const char *reason))
+{
+ talloc_abort_fn = abort_fn;
+}
+
+static void talloc_abort(const char *reason)
+{
+ talloc_log("%s\n", reason);
+
+ if (!talloc_abort_fn) {
+ TALLOC_ABORT(reason);
+ }
+
+ talloc_abort_fn(reason);
+}
+
+static void talloc_abort_access_after_free(void)
+{
+ talloc_abort("Bad talloc magic value - access after free");
+}
+
+static void talloc_abort_unknown_value(void)
+{
+ talloc_abort("Bad talloc magic value - unknown value");
+}
+
+/* panic if we get a bad magic value */
+static inline struct talloc_chunk *talloc_chunk_from_ptr(const void *ptr)
+{
+ const char *pp = (const char *)ptr;
+ struct talloc_chunk *tc = discard_const_p(struct talloc_chunk, pp - TC_HDR_SIZE);
+ if (unlikely((tc->flags & (TALLOC_FLAG_FREE | ~TALLOC_FLAG_MASK)) != talloc_magic)) {
+ if ((tc->flags & (TALLOC_FLAG_FREE | ~TALLOC_FLAG_MASK))
+ == (TALLOC_MAGIC_NON_RANDOM | TALLOC_FLAG_FREE)) {
+ talloc_log("talloc: access after free error - first free may be at %s\n", tc->name);
+ talloc_abort_access_after_free();
+ return NULL;
+ }
+
+ talloc_abort_unknown_value();
+ return NULL;
+ }
+ return tc;
+}
+
+/* hook into the front of the list */
+#define _TLIST_ADD(list, p) \
+do { \
+ if (!(list)) { \
+ (list) = (p); \
+ (p)->next = (p)->prev = NULL; \
+ } else { \
+ (list)->prev = (p); \
+ (p)->next = (list); \
+ (p)->prev = NULL; \
+ (list) = (p); \
+ }\
+} while (0)
+
+/* remove an element from a list - element doesn't have to be in list. */
+#define _TLIST_REMOVE(list, p) \
+do { \
+ if ((p) == (list)) { \
+ (list) = (p)->next; \
+ if (list) (list)->prev = NULL; \
+ } else { \
+ if ((p)->prev) (p)->prev->next = (p)->next; \
+ if ((p)->next) (p)->next->prev = (p)->prev; \
+ } \
+ if ((p) && ((p) != (list))) (p)->next = (p)->prev = NULL; \
+} while (0)
+
+
+/*
+ return the parent chunk of a pointer
+*/
+static inline struct talloc_chunk *talloc_parent_chunk(const void *ptr)
+{
+ struct talloc_chunk *tc;
+
+ if (unlikely(ptr == NULL)) {
+ return NULL;
+ }
+
+ tc = talloc_chunk_from_ptr(ptr);
+ while (tc->prev) tc=tc->prev;
+
+ return tc->parent;
+}
+
+_PUBLIC_ void *talloc_parent(const void *ptr)
+{
+ struct talloc_chunk *tc = talloc_parent_chunk(ptr);
+ return tc? TC_PTR_FROM_CHUNK(tc) : NULL;
+}
+
+/*
+ find parents name
+*/
+_PUBLIC_ const char *talloc_parent_name(const void *ptr)
+{
+ struct talloc_chunk *tc = talloc_parent_chunk(ptr);
+ return tc? tc->name : NULL;
+}
+
+/*
+ A pool carries an in-pool object count count in the first 16 bytes.
+ bytes. This is done to support talloc_steal() to a parent outside of the
+ pool. The count includes the pool itself, so a talloc_free() on a pool will
+ only destroy the pool if the count has dropped to zero. A talloc_free() of a
+ pool member will reduce the count, and eventually also call free(3) on the
+ pool memory.
+
+ The object count is not put into "struct talloc_chunk" because it is only
+ relevant for talloc pools and the alignment to 16 bytes would increase the
+ memory footprint of each talloc chunk by those 16 bytes.
+*/
+
+struct talloc_pool_hdr {
+ void *end;
+ unsigned int object_count;
+ size_t poolsize;
+};
+
+union talloc_pool_hdr_cast_u {
+ uint8_t *ptr;
+ struct talloc_pool_hdr *hdr;
+};
+
+#define TP_HDR_SIZE TC_ALIGN16(sizeof(struct talloc_pool_hdr))
+
+static inline struct talloc_pool_hdr *talloc_pool_from_chunk(struct talloc_chunk *c)
+{
+ union talloc_chunk_cast_u tcc = { .chunk = c };
+ union talloc_pool_hdr_cast_u tphc = { tcc.ptr - TP_HDR_SIZE };
+ return tphc.hdr;
+}
+
+static inline struct talloc_chunk *talloc_chunk_from_pool(struct talloc_pool_hdr *h)
+{
+ union talloc_pool_hdr_cast_u tphc = { .hdr = h };
+ union talloc_chunk_cast_u tcc = { .ptr = tphc.ptr + TP_HDR_SIZE };
+ return tcc.chunk;
+}
+
+static inline void *tc_pool_end(struct talloc_pool_hdr *pool_hdr)
+{
+ struct talloc_chunk *tc = talloc_chunk_from_pool(pool_hdr);
+ return (char *)tc + TC_HDR_SIZE + pool_hdr->poolsize;
+}
+
+static inline size_t tc_pool_space_left(struct talloc_pool_hdr *pool_hdr)
+{
+ return (char *)tc_pool_end(pool_hdr) - (char *)pool_hdr->end;
+}
+
+/* If tc is inside a pool, this gives the next neighbour. */
+static inline void *tc_next_chunk(struct talloc_chunk *tc)
+{
+ return (char *)tc + TC_ALIGN16(TC_HDR_SIZE + tc->size);
+}
+
+static inline void *tc_pool_first_chunk(struct talloc_pool_hdr *pool_hdr)
+{
+ struct talloc_chunk *tc = talloc_chunk_from_pool(pool_hdr);
+ return tc_next_chunk(tc);
+}
+
+/* Mark the whole remaining pool as not accessible */
+static inline void tc_invalidate_pool(struct talloc_pool_hdr *pool_hdr)
+{
+ size_t flen = tc_pool_space_left(pool_hdr);
+
+ if (unlikely(talloc_fill.enabled)) {
+ memset(pool_hdr->end, talloc_fill.fill_value, flen);
+ }
+
+#if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_NOACCESS)
+ VALGRIND_MAKE_MEM_NOACCESS(pool_hdr->end, flen);
+#endif
+}
+
+/*
+ Allocate from a pool
+*/
+
+static inline struct talloc_chunk *tc_alloc_pool(struct talloc_chunk *parent,
+ size_t size, size_t prefix_len)
+{
+ struct talloc_pool_hdr *pool_hdr = NULL;
+ union talloc_chunk_cast_u tcc;
+ size_t space_left;
+ struct talloc_chunk *result;
+ size_t chunk_size;
+
+ if (parent == NULL) {
+ return NULL;
+ }
+
+ if (parent->flags & TALLOC_FLAG_POOL) {
+ pool_hdr = talloc_pool_from_chunk(parent);
+ }
+ else if (parent->flags & TALLOC_FLAG_POOLMEM) {
+ pool_hdr = parent->pool;
+ }
+
+ if (pool_hdr == NULL) {
+ return NULL;
+ }
+
+ space_left = tc_pool_space_left(pool_hdr);
+
+ /*
+ * Align size to 16 bytes
+ */
+ chunk_size = TC_ALIGN16(size + prefix_len);
+
+ if (space_left < chunk_size) {
+ return NULL;
+ }
+
+ tcc = (union talloc_chunk_cast_u) {
+ .ptr = ((uint8_t *)pool_hdr->end) + prefix_len
+ };
+ result = tcc.chunk;
+
+#if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_UNDEFINED)
+ VALGRIND_MAKE_MEM_UNDEFINED(pool_hdr->end, chunk_size);
+#endif
+
+ pool_hdr->end = (void *)((char *)pool_hdr->end + chunk_size);
+
+ result->flags = talloc_magic | TALLOC_FLAG_POOLMEM;
+ result->pool = pool_hdr;
+
+ pool_hdr->object_count++;
+
+ return result;
+}
+
+/*
+ Allocate a bit of memory as a child of an existing pointer
+*/
+static inline void *__talloc_with_prefix(const void *context,
+ size_t size,
+ size_t prefix_len,
+ struct talloc_chunk **tc_ret)
+{
+ struct talloc_chunk *tc = NULL;
+ struct talloc_memlimit *limit = NULL;
+ size_t total_len = TC_HDR_SIZE + size + prefix_len;
+ struct talloc_chunk *parent = NULL;
+
+ if (unlikely(context == NULL)) {
+ context = null_context;
+ }
+
+ if (unlikely(size >= MAX_TALLOC_SIZE)) {
+ return NULL;
+ }
+
+ if (unlikely(total_len < TC_HDR_SIZE)) {
+ return NULL;
+ }
+
+ if (likely(context != NULL)) {
+ parent = talloc_chunk_from_ptr(context);
+
+ if (parent->limit != NULL) {
+ limit = parent->limit;
+ }
+
+ tc = tc_alloc_pool(parent, TC_HDR_SIZE+size, prefix_len);
+ }
+
+ if (tc == NULL) {
+ uint8_t *ptr = NULL;
+ union talloc_chunk_cast_u tcc;
+
+ /*
+ * Only do the memlimit check/update on actual allocation.
+ */
+ if (!talloc_memlimit_check(limit, total_len)) {
+ errno = ENOMEM;
+ return NULL;
+ }
+
+ ptr = malloc(total_len);
+ if (unlikely(ptr == NULL)) {
+ return NULL;
+ }
+ tcc = (union talloc_chunk_cast_u) { .ptr = ptr + prefix_len };
+ tc = tcc.chunk;
+ tc->flags = talloc_magic;
+ tc->pool = NULL;
+
+ talloc_memlimit_grow(limit, total_len);
+ }
+
+ tc->limit = limit;
+ tc->size = size;
+ tc->destructor = NULL;
+ tc->child = NULL;
+ tc->name = NULL;
+ tc->refs = NULL;
+
+ if (likely(context != NULL)) {
+ if (parent->child) {
+ parent->child->parent = NULL;
+ tc->next = parent->child;
+ tc->next->prev = tc;
+ } else {
+ tc->next = NULL;
+ }
+ tc->parent = parent;
+ tc->prev = NULL;
+ parent->child = tc;
+ } else {
+ tc->next = tc->prev = tc->parent = NULL;
+ }
+
+ *tc_ret = tc;
+ return TC_PTR_FROM_CHUNK(tc);
+}
+
+static inline void *__talloc(const void *context,
+ size_t size,
+ struct talloc_chunk **tc)
+{
+ return __talloc_with_prefix(context, size, 0, tc);
+}
+
+/*
+ * Create a talloc pool
+ */
+
+static inline void *_talloc_pool(const void *context, size_t size)
+{
+ struct talloc_chunk *tc = NULL;
+ struct talloc_pool_hdr *pool_hdr;
+ void *result;
+
+ result = __talloc_with_prefix(context, size, TP_HDR_SIZE, &tc);
+
+ if (unlikely(result == NULL)) {
+ return NULL;
+ }
+
+ pool_hdr = talloc_pool_from_chunk(tc);
+
+ tc->flags |= TALLOC_FLAG_POOL;
+ tc->size = 0;
+
+ pool_hdr->object_count = 1;
+ pool_hdr->end = result;
+ pool_hdr->poolsize = size;
+
+ tc_invalidate_pool(pool_hdr);
+
+ return result;
+}
+
+_PUBLIC_ void *talloc_pool(const void *context, size_t size)
+{
+ return _talloc_pool(context, size);
+}
+
+/*
+ * Create a talloc pool correctly sized for a basic size plus
+ * a number of subobjects whose total size is given. Essentially
+ * a custom allocator for talloc to reduce fragmentation.
+ */
+
+_PUBLIC_ void *_talloc_pooled_object(const void *ctx,
+ size_t type_size,
+ const char *type_name,
+ unsigned num_subobjects,
+ size_t total_subobjects_size)
+{
+ size_t poolsize, subobjects_slack, tmp;
+ struct talloc_chunk *tc;
+ struct talloc_pool_hdr *pool_hdr;
+ void *ret;
+
+ poolsize = type_size + total_subobjects_size;
+
+ if ((poolsize < type_size) || (poolsize < total_subobjects_size)) {
+ goto overflow;
+ }
+
+ if (num_subobjects == UINT_MAX) {
+ goto overflow;
+ }
+ num_subobjects += 1; /* the object body itself */
+
+ /*
+ * Alignment can increase the pool size by at most 15 bytes per object
+ * plus alignment for the object itself
+ */
+ subobjects_slack = (TC_HDR_SIZE + TP_HDR_SIZE + 15) * num_subobjects;
+ if (subobjects_slack < num_subobjects) {
+ goto overflow;
+ }
+
+ tmp = poolsize + subobjects_slack;
+ if ((tmp < poolsize) || (tmp < subobjects_slack)) {
+ goto overflow;
+ }
+ poolsize = tmp;
+
+ ret = _talloc_pool(ctx, poolsize);
+ if (ret == NULL) {
+ return NULL;
+ }
+
+ tc = talloc_chunk_from_ptr(ret);
+ tc->size = type_size;
+
+ pool_hdr = talloc_pool_from_chunk(tc);
+
+#if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_UNDEFINED)
+ VALGRIND_MAKE_MEM_UNDEFINED(pool_hdr->end, type_size);
+#endif
+
+ pool_hdr->end = ((char *)pool_hdr->end + TC_ALIGN16(type_size));
+
+ _tc_set_name_const(tc, type_name);
+ return ret;
+
+overflow:
+ return NULL;
+}
+
+/*
+ setup a destructor to be called on free of a pointer
+ the destructor should return 0 on success, or -1 on failure.
+ if the destructor fails then the free is failed, and the memory can
+ be continued to be used
+*/
+_PUBLIC_ void _talloc_set_destructor(const void *ptr, int (*destructor)(void *))
+{
+ struct talloc_chunk *tc = talloc_chunk_from_ptr(ptr);
+ tc->destructor = destructor;
+}
+
+/*
+ increase the reference count on a piece of memory.
+*/
+_PUBLIC_ int talloc_increase_ref_count(const void *ptr)
+{
+ if (unlikely(!talloc_reference(null_context, ptr))) {
+ return -1;
+ }
+ return 0;
+}
+
+/*
+ helper for talloc_reference()
+
+ this is referenced by a function pointer and should not be inline
+*/
+static int talloc_reference_destructor(struct talloc_reference_handle *handle)
+{
+ struct talloc_chunk *ptr_tc = talloc_chunk_from_ptr(handle->ptr);
+ _TLIST_REMOVE(ptr_tc->refs, handle);
+ return 0;
+}
+
+/*
+ more efficient way to add a name to a pointer - the name must point to a
+ true string constant
+*/
+static inline void _tc_set_name_const(struct talloc_chunk *tc,
+ const char *name)
+{
+ tc->name = name;
+}
+
+/*
+ internal talloc_named_const()
+*/
+static inline void *_talloc_named_const(const void *context, size_t size, const char *name)
+{
+ void *ptr;
+ struct talloc_chunk *tc = NULL;
+
+ ptr = __talloc(context, size, &tc);
+ if (unlikely(ptr == NULL)) {
+ return NULL;
+ }
+
+ _tc_set_name_const(tc, name);
+
+ return ptr;
+}
+
+/*
+ make a secondary reference to a pointer, hanging off the given context.
+ the pointer remains valid until both the original caller and this given
+ context are freed.
+
+ the major use for this is when two different structures need to reference the
+ same underlying data, and you want to be able to free the two instances separately,
+ and in either order
+*/
+_PUBLIC_ void *_talloc_reference_loc(const void *context, const void *ptr, const char *location)
+{
+ struct talloc_chunk *tc;
+ struct talloc_reference_handle *handle;
+ if (unlikely(ptr == NULL)) return NULL;
+
+ tc = talloc_chunk_from_ptr(ptr);
+ handle = (struct talloc_reference_handle *)_talloc_named_const(context,
+ sizeof(struct talloc_reference_handle),
+ TALLOC_MAGIC_REFERENCE);
+ if (unlikely(handle == NULL)) return NULL;
+
+ /* note that we hang the destructor off the handle, not the
+ main context as that allows the caller to still setup their
+ own destructor on the context if they want to */
+ talloc_set_destructor(handle, talloc_reference_destructor);
+ handle->ptr = discard_const_p(void, ptr);
+ handle->location = location;
+ _TLIST_ADD(tc->refs, handle);
+ return handle->ptr;
+}
+
+static void *_talloc_steal_internal(const void *new_ctx, const void *ptr);
+
+static inline void _tc_free_poolmem(struct talloc_chunk *tc,
+ const char *location)
+{
+ struct talloc_pool_hdr *pool;
+ struct talloc_chunk *pool_tc;
+ void *next_tc;
+
+ pool = tc->pool;
+ pool_tc = talloc_chunk_from_pool(pool);
+ next_tc = tc_next_chunk(tc);
+
+ _talloc_chunk_set_free(tc, location);
+
+ TC_INVALIDATE_FULL_CHUNK(tc);
+
+ if (unlikely(pool->object_count == 0)) {
+ talloc_abort("Pool object count zero!");
+ return;
+ }
+
+ pool->object_count--;
+
+ if (unlikely(pool->object_count == 1
+ && !(pool_tc->flags & TALLOC_FLAG_FREE))) {
+ /*
+ * if there is just one object left in the pool
+ * and pool->flags does not have TALLOC_FLAG_FREE,
+ * it means this is the pool itself and
+ * the rest is available for new objects
+ * again.
+ */
+ pool->end = tc_pool_first_chunk(pool);
+ tc_invalidate_pool(pool);
+ return;
+ }
+
+ if (unlikely(pool->object_count == 0)) {
+ /*
+ * we mark the freed memory with where we called the free
+ * from. This means on a double free error we can report where
+ * the first free came from
+ */
+ pool_tc->name = location;
+
+ if (pool_tc->flags & TALLOC_FLAG_POOLMEM) {
+ _tc_free_poolmem(pool_tc, location);
+ } else {
+ /*
+ * The tc_memlimit_update_on_free()
+ * call takes into account the
+ * prefix TP_HDR_SIZE allocated before
+ * the pool talloc_chunk.
+ */
+ tc_memlimit_update_on_free(pool_tc);
+ TC_INVALIDATE_FULL_CHUNK(pool_tc);
+ free(pool);
+ }
+ return;
+ }
+
+ if (pool->end == next_tc) {
+ /*
+ * if pool->pool still points to end of
+ * 'tc' (which is stored in the 'next_tc' variable),
+ * we can reclaim the memory of 'tc'.
+ */
+ pool->end = tc;
+ return;
+ }
+
+ /*
+ * Do nothing. The memory is just "wasted", waiting for the pool
+ * itself to be freed.
+ */
+}
+
+static inline void _tc_free_children_internal(struct talloc_chunk *tc,
+ void *ptr,
+ const char *location);
+
+static inline int _talloc_free_internal(void *ptr, const char *location);
+
+/*
+ internal free call that takes a struct talloc_chunk *.
+*/
+static inline int _tc_free_internal(struct talloc_chunk *tc,
+ const char *location)
+{
+ void *ptr_to_free;
+ void *ptr = TC_PTR_FROM_CHUNK(tc);
+
+ if (unlikely(tc->refs)) {
+ int is_child;
+ /* check if this is a reference from a child or
+ * grandchild back to it's parent or grandparent
+ *
+ * in that case we need to remove the reference and
+ * call another instance of talloc_free() on the current
+ * pointer.
+ */
+ is_child = talloc_is_parent(tc->refs, ptr);
+ _talloc_free_internal(tc->refs, location);
+ if (is_child) {
+ return _talloc_free_internal(ptr, location);
+ }
+ return -1;
+ }
+
+ if (unlikely(tc->flags & TALLOC_FLAG_LOOP)) {
+ /* we have a free loop - stop looping */
+ return 0;
+ }
+
+ if (unlikely(tc->destructor)) {
+ talloc_destructor_t d = tc->destructor;
+
+ /*
+ * Protect the destructor against some overwrite
+ * attacks, by explicitly checking it has the right
+ * magic here.
+ */
+ if (talloc_chunk_from_ptr(ptr) != tc) {
+ /*
+ * This can't actually happen, the
+ * call itself will panic.
+ */
+ TALLOC_ABORT("talloc_chunk_from_ptr failed!");
+ }
+
+ if (d == (talloc_destructor_t)-1) {
+ return -1;
+ }
+ tc->destructor = (talloc_destructor_t)-1;
+ if (d(ptr) == -1) {
+ /*
+ * Only replace the destructor pointer if
+ * calling the destructor didn't modify it.
+ */
+ if (tc->destructor == (talloc_destructor_t)-1) {
+ tc->destructor = d;
+ }
+ return -1;
+ }
+ tc->destructor = NULL;
+ }
+
+ if (tc->parent) {
+ _TLIST_REMOVE(tc->parent->child, tc);
+ if (tc->parent->child) {
+ tc->parent->child->parent = tc->parent;
+ }
+ } else {
+ if (tc->prev) tc->prev->next = tc->next;
+ if (tc->next) tc->next->prev = tc->prev;
+ tc->prev = tc->next = NULL;
+ }
+
+ tc->flags |= TALLOC_FLAG_LOOP;
+
+ _tc_free_children_internal(tc, ptr, location);
+
+ _talloc_chunk_set_free(tc, location);
+
+ if (tc->flags & TALLOC_FLAG_POOL) {
+ struct talloc_pool_hdr *pool;
+
+ pool = talloc_pool_from_chunk(tc);
+
+ if (unlikely(pool->object_count == 0)) {
+ talloc_abort("Pool object count zero!");
+ return 0;
+ }
+
+ pool->object_count--;
+
+ if (likely(pool->object_count != 0)) {
+ return 0;
+ }
+
+ /*
+ * With object_count==0, a pool becomes a normal piece of
+ * memory to free. If it's allocated inside a pool, it needs
+ * to be freed as poolmem, else it needs to be just freed.
+ */
+ ptr_to_free = pool;
+ } else {
+ ptr_to_free = tc;
+ }
+
+ if (tc->flags & TALLOC_FLAG_POOLMEM) {
+ _tc_free_poolmem(tc, location);
+ return 0;
+ }
+
+ tc_memlimit_update_on_free(tc);
+
+ TC_INVALIDATE_FULL_CHUNK(tc);
+ free(ptr_to_free);
+ return 0;
+}
+
+/*
+ internal talloc_free call
+*/
+static inline int _talloc_free_internal(void *ptr, const char *location)
+{
+ struct talloc_chunk *tc;
+
+ if (unlikely(ptr == NULL)) {
+ return -1;
+ }
+
+ /* possibly initialised the talloc fill value */
+ if (unlikely(!talloc_fill.initialised)) {
+ const char *fill = getenv(TALLOC_FILL_ENV);
+ if (fill != NULL) {
+ talloc_fill.enabled = true;
+ talloc_fill.fill_value = strtoul(fill, NULL, 0);
+ }
+ talloc_fill.initialised = true;
+ }
+
+ tc = talloc_chunk_from_ptr(ptr);
+ return _tc_free_internal(tc, location);
+}
+
+static inline size_t _talloc_total_limit_size(const void *ptr,
+ struct talloc_memlimit *old_limit,
+ struct talloc_memlimit *new_limit);
+
+/*
+ move a lump of memory from one talloc context to another returning the
+ ptr on success, or NULL if it could not be transferred.
+ passing NULL as ptr will always return NULL with no side effects.
+*/
+static void *_talloc_steal_internal(const void *new_ctx, const void *ptr)
+{
+ struct talloc_chunk *tc, *new_tc;
+ size_t ctx_size = 0;
+
+ if (unlikely(!ptr)) {
+ return NULL;
+ }
+
+ if (unlikely(new_ctx == NULL)) {
+ new_ctx = null_context;
+ }
+
+ tc = talloc_chunk_from_ptr(ptr);
+
+ if (tc->limit != NULL) {
+
+ ctx_size = _talloc_total_limit_size(ptr, NULL, NULL);
+
+ /* Decrement the memory limit from the source .. */
+ talloc_memlimit_shrink(tc->limit->upper, ctx_size);
+
+ if (tc->limit->parent == tc) {
+ tc->limit->upper = NULL;
+ } else {
+ tc->limit = NULL;
+ }
+ }
+
+ if (unlikely(new_ctx == NULL)) {
+ if (tc->parent) {
+ _TLIST_REMOVE(tc->parent->child, tc);
+ if (tc->parent->child) {
+ tc->parent->child->parent = tc->parent;
+ }
+ } else {
+ if (tc->prev) tc->prev->next = tc->next;
+ if (tc->next) tc->next->prev = tc->prev;
+ }
+
+ tc->parent = tc->next = tc->prev = NULL;
+ return discard_const_p(void, ptr);
+ }
+
+ new_tc = talloc_chunk_from_ptr(new_ctx);
+
+ if (unlikely(tc == new_tc || tc->parent == new_tc)) {
+ return discard_const_p(void, ptr);
+ }
+
+ if (tc->parent) {
+ _TLIST_REMOVE(tc->parent->child, tc);
+ if (tc->parent->child) {
+ tc->parent->child->parent = tc->parent;
+ }
+ } else {
+ if (tc->prev) tc->prev->next = tc->next;
+ if (tc->next) tc->next->prev = tc->prev;
+ tc->prev = tc->next = NULL;
+ }
+
+ tc->parent = new_tc;
+ if (new_tc->child) new_tc->child->parent = NULL;
+ _TLIST_ADD(new_tc->child, tc);
+
+ if (tc->limit || new_tc->limit) {
+ ctx_size = _talloc_total_limit_size(ptr, tc->limit,
+ new_tc->limit);
+ /* .. and increment it in the destination. */
+ if (new_tc->limit) {
+ talloc_memlimit_grow(new_tc->limit, ctx_size);
+ }
+ }
+
+ return discard_const_p(void, ptr);
+}
+
+/*
+ move a lump of memory from one talloc context to another returning the
+ ptr on success, or NULL if it could not be transferred.
+ passing NULL as ptr will always return NULL with no side effects.
+*/
+_PUBLIC_ void *_talloc_steal_loc(const void *new_ctx, const void *ptr, const char *location)
+{
+ struct talloc_chunk *tc;
+
+ if (unlikely(ptr == NULL)) {
+ return NULL;
+ }
+
+ tc = talloc_chunk_from_ptr(ptr);
+
+ if (unlikely(tc->refs != NULL) && talloc_parent(ptr) != new_ctx) {
+ struct talloc_reference_handle *h;
+
+ talloc_log("WARNING: talloc_steal with references at %s\n",
+ location);
+
+ for (h=tc->refs; h; h=h->next) {
+ talloc_log("\treference at %s\n",
+ h->location);
+ }
+ }
+
+#if 0
+ /* this test is probably too expensive to have on in the
+ normal build, but it useful for debugging */
+ if (talloc_is_parent(new_ctx, ptr)) {
+ talloc_log("WARNING: stealing into talloc child at %s\n", location);
+ }
+#endif
+
+ return _talloc_steal_internal(new_ctx, ptr);
+}
+
+/*
+ this is like a talloc_steal(), but you must supply the old
+ parent. This resolves the ambiguity in a talloc_steal() which is
+ called on a context that has more than one parent (via references)
+
+ The old parent can be either a reference or a parent
+*/
+_PUBLIC_ void *talloc_reparent(const void *old_parent, const void *new_parent, const void *ptr)
+{
+ struct talloc_chunk *tc;
+ struct talloc_reference_handle *h;
+
+ if (unlikely(ptr == NULL)) {
+ return NULL;
+ }
+
+ if (old_parent == talloc_parent(ptr)) {
+ return _talloc_steal_internal(new_parent, ptr);
+ }
+
+ tc = talloc_chunk_from_ptr(ptr);
+ for (h=tc->refs;h;h=h->next) {
+ if (talloc_parent(h) == old_parent) {
+ if (_talloc_steal_internal(new_parent, h) != h) {
+ return NULL;
+ }
+ return discard_const_p(void, ptr);
+ }
+ }
+
+ /* it wasn't a parent */
+ return NULL;
+}
+
+/*
+ remove a secondary reference to a pointer. This undo's what
+ talloc_reference() has done. The context and pointer arguments
+ must match those given to a talloc_reference()
+*/
+static inline int talloc_unreference(const void *context, const void *ptr)
+{
+ struct talloc_chunk *tc = talloc_chunk_from_ptr(ptr);
+ struct talloc_reference_handle *h;
+
+ if (unlikely(context == NULL)) {
+ context = null_context;
+ }
+
+ for (h=tc->refs;h;h=h->next) {
+ struct talloc_chunk *p = talloc_parent_chunk(h);
+ if (p == NULL) {
+ if (context == NULL) break;
+ } else if (TC_PTR_FROM_CHUNK(p) == context) {
+ break;
+ }
+ }
+ if (h == NULL) {
+ return -1;
+ }
+
+ return _talloc_free_internal(h, __location__);
+}
+
+/*
+ remove a specific parent context from a pointer. This is a more
+ controlled variant of talloc_free()
+*/
+
+/* coverity[ -tainted_data_sink : arg-1 ] */
+_PUBLIC_ int talloc_unlink(const void *context, void *ptr)
+{
+ struct talloc_chunk *tc_p, *new_p, *tc_c;
+ void *new_parent;
+
+ if (ptr == NULL) {
+ return -1;
+ }
+
+ if (context == NULL) {
+ context = null_context;
+ }
+
+ if (talloc_unreference(context, ptr) == 0) {
+ return 0;
+ }
+
+ if (context != NULL) {
+ tc_c = talloc_chunk_from_ptr(context);
+ } else {
+ tc_c = NULL;
+ }
+ if (tc_c != talloc_parent_chunk(ptr)) {
+ return -1;
+ }
+
+ tc_p = talloc_chunk_from_ptr(ptr);
+
+ if (tc_p->refs == NULL) {
+ return _talloc_free_internal(ptr, __location__);
+ }
+
+ new_p = talloc_parent_chunk(tc_p->refs);
+ if (new_p) {
+ new_parent = TC_PTR_FROM_CHUNK(new_p);
+ } else {
+ new_parent = NULL;
+ }
+
+ if (talloc_unreference(new_parent, ptr) != 0) {
+ return -1;
+ }
+
+ _talloc_steal_internal(new_parent, ptr);
+
+ return 0;
+}
+
+/*
+ add a name to an existing pointer - va_list version
+*/
+static inline const char *tc_set_name_v(struct talloc_chunk *tc,
+ const char *fmt,
+ va_list ap) PRINTF_ATTRIBUTE(2,0);
+
+static inline const char *tc_set_name_v(struct talloc_chunk *tc,
+ const char *fmt,
+ va_list ap)
+{
+ struct talloc_chunk *name_tc = _vasprintf_tc(TC_PTR_FROM_CHUNK(tc),
+ fmt,
+ ap);
+ if (likely(name_tc)) {
+ tc->name = TC_PTR_FROM_CHUNK(name_tc);
+ _tc_set_name_const(name_tc, ".name");
+ } else {
+ tc->name = NULL;
+ }
+ return tc->name;
+}
+
+/*
+ add a name to an existing pointer
+*/
+_PUBLIC_ const char *talloc_set_name(const void *ptr, const char *fmt, ...)
+{
+ struct talloc_chunk *tc = talloc_chunk_from_ptr(ptr);
+ const char *name;
+ va_list ap;
+ va_start(ap, fmt);
+ name = tc_set_name_v(tc, fmt, ap);
+ va_end(ap);
+ return name;
+}
+
+
+/*
+ create a named talloc pointer. Any talloc pointer can be named, and
+ talloc_named() operates just like talloc() except that it allows you
+ to name the pointer.
+*/
+_PUBLIC_ void *talloc_named(const void *context, size_t size, const char *fmt, ...)
+{
+ va_list ap;
+ void *ptr;
+ const char *name;
+ struct talloc_chunk *tc = NULL;
+
+ ptr = __talloc(context, size, &tc);
+ if (unlikely(ptr == NULL)) return NULL;
+
+ va_start(ap, fmt);
+ name = tc_set_name_v(tc, fmt, ap);
+ va_end(ap);
+
+ if (unlikely(name == NULL)) {
+ _talloc_free_internal(ptr, __location__);
+ return NULL;
+ }
+
+ return ptr;
+}
+
+/*
+ return the name of a talloc ptr, or "UNNAMED"
+*/
+static inline const char *__talloc_get_name(const void *ptr)
+{
+ struct talloc_chunk *tc = talloc_chunk_from_ptr(ptr);
+ if (unlikely(tc->name == TALLOC_MAGIC_REFERENCE)) {
+ return ".reference";
+ }
+ if (likely(tc->name)) {
+ return tc->name;
+ }
+ return "UNNAMED";
+}
+
+_PUBLIC_ const char *talloc_get_name(const void *ptr)
+{
+ return __talloc_get_name(ptr);
+}
+
+/*
+ check if a pointer has the given name. If it does, return the pointer,
+ otherwise return NULL
+*/
+_PUBLIC_ void *talloc_check_name(const void *ptr, const char *name)
+{
+ const char *pname;
+ if (unlikely(ptr == NULL)) return NULL;
+ pname = __talloc_get_name(ptr);
+ if (likely(pname == name || strcmp(pname, name) == 0)) {
+ return discard_const_p(void, ptr);
+ }
+ return NULL;
+}
+
+static void talloc_abort_type_mismatch(const char *location,
+ const char *name,
+ const char *expected)
+{
+ const char *reason;
+
+ reason = talloc_asprintf(NULL,
+ "%s: Type mismatch: name[%s] expected[%s]",
+ location,
+ name?name:"NULL",
+ expected);
+ if (!reason) {
+ reason = "Type mismatch";
+ }
+
+ talloc_abort(reason);
+}
+
+_PUBLIC_ void *_talloc_get_type_abort(const void *ptr, const char *name, const char *location)
+{
+ const char *pname;
+
+ if (unlikely(ptr == NULL)) {
+ talloc_abort_type_mismatch(location, NULL, name);
+ return NULL;
+ }
+
+ pname = __talloc_get_name(ptr);
+ if (likely(pname == name || strcmp(pname, name) == 0)) {
+ return discard_const_p(void, ptr);
+ }
+
+ talloc_abort_type_mismatch(location, pname, name);
+ return NULL;
+}
+
+/*
+ this is for compatibility with older versions of talloc
+*/
+_PUBLIC_ void *talloc_init(const char *fmt, ...)
+{
+ va_list ap;
+ void *ptr;
+ const char *name;
+ struct talloc_chunk *tc = NULL;
+
+ ptr = __talloc(NULL, 0, &tc);
+ if (unlikely(ptr == NULL)) return NULL;
+
+ va_start(ap, fmt);
+ name = tc_set_name_v(tc, fmt, ap);
+ va_end(ap);
+
+ if (unlikely(name == NULL)) {
+ _talloc_free_internal(ptr, __location__);
+ return NULL;
+ }
+
+ return ptr;
+}
+
+static inline void _tc_free_children_internal(struct talloc_chunk *tc,
+ void *ptr,
+ const char *location)
+{
+ while (tc->child) {
+ /* we need to work out who will own an abandoned child
+ if it cannot be freed. In priority order, the first
+ choice is owner of any remaining reference to this
+ pointer, the second choice is our parent, and the
+ final choice is the null context. */
+ void *child = TC_PTR_FROM_CHUNK(tc->child);
+ const void *new_parent = null_context;
+ if (unlikely(tc->child->refs)) {
+ struct talloc_chunk *p = talloc_parent_chunk(tc->child->refs);
+ if (p) new_parent = TC_PTR_FROM_CHUNK(p);
+ }
+ if (unlikely(_tc_free_internal(tc->child, location) == -1)) {
+ if (talloc_parent_chunk(child) != tc) {
+ /*
+ * Destructor already reparented this child.
+ * No further reparenting needed.
+ */
+ continue;
+ }
+ if (new_parent == null_context) {
+ struct talloc_chunk *p = talloc_parent_chunk(ptr);
+ if (p) new_parent = TC_PTR_FROM_CHUNK(p);
+ }
+ _talloc_steal_internal(new_parent, child);
+ }
+ }
+}
+
+/*
+ this is a replacement for the Samba3 talloc_destroy_pool functionality. It
+ should probably not be used in new code. It's in here to keep the talloc
+ code consistent across Samba 3 and 4.
+*/
+_PUBLIC_ void talloc_free_children(void *ptr)
+{
+ struct talloc_chunk *tc_name = NULL;
+ struct talloc_chunk *tc;
+
+ if (unlikely(ptr == NULL)) {
+ return;
+ }
+
+ tc = talloc_chunk_from_ptr(ptr);
+
+ /* we do not want to free the context name if it is a child .. */
+ if (likely(tc->child)) {
+ for (tc_name = tc->child; tc_name; tc_name = tc_name->next) {
+ if (tc->name == TC_PTR_FROM_CHUNK(tc_name)) break;
+ }
+ if (tc_name) {
+ _TLIST_REMOVE(tc->child, tc_name);
+ if (tc->child) {
+ tc->child->parent = tc;
+ }
+ }
+ }
+
+ _tc_free_children_internal(tc, ptr, __location__);
+
+ /* .. so we put it back after all other children have been freed */
+ if (tc_name) {
+ if (tc->child) {
+ tc->child->parent = NULL;
+ }
+ tc_name->parent = tc;
+ _TLIST_ADD(tc->child, tc_name);
+ }
+}
+
+/*
+ Allocate a bit of memory as a child of an existing pointer
+*/
+_PUBLIC_ void *_talloc(const void *context, size_t size)
+{
+ struct talloc_chunk *tc;
+ return __talloc(context, size, &tc);
+}
+
+/*
+ externally callable talloc_set_name_const()
+*/
+_PUBLIC_ void talloc_set_name_const(const void *ptr, const char *name)
+{
+ _tc_set_name_const(talloc_chunk_from_ptr(ptr), name);
+}
+
+/*
+ create a named talloc pointer. Any talloc pointer can be named, and
+ talloc_named() operates just like talloc() except that it allows you
+ to name the pointer.
+*/
+_PUBLIC_ void *talloc_named_const(const void *context, size_t size, const char *name)
+{
+ return _talloc_named_const(context, size, name);
+}
+
+/*
+ free a talloc pointer. This also frees all child pointers of this
+ pointer recursively
+
+ return 0 if the memory is actually freed, otherwise -1. The memory
+ will not be freed if the ref_count is > 1 or the destructor (if
+ any) returns non-zero
+*/
+_PUBLIC_ int _talloc_free(void *ptr, const char *location)
+{
+ struct talloc_chunk *tc;
+
+ if (unlikely(ptr == NULL)) {
+ return -1;
+ }
+
+ tc = talloc_chunk_from_ptr(ptr);
+
+ if (unlikely(tc->refs != NULL)) {
+ struct talloc_reference_handle *h;
+
+ if (talloc_parent(ptr) == null_context && tc->refs->next == NULL) {
+ /* in this case we do know which parent should
+ get this pointer, as there is really only
+ one parent */
+ return talloc_unlink(null_context, ptr);
+ }
+
+ talloc_log("ERROR: talloc_free with references at %s\n",
+ location);
+
+ for (h=tc->refs; h; h=h->next) {
+ talloc_log("\treference at %s\n",
+ h->location);
+ }
+ return -1;
+ }
+
+ return _talloc_free_internal(ptr, location);
+}
+
+
+
+/*
+ A talloc version of realloc. The context argument is only used if
+ ptr is NULL
+*/
+_PUBLIC_ void *_talloc_realloc(const void *context, void *ptr, size_t size, const char *name)
+{
+ struct talloc_chunk *tc;
+ void *new_ptr;
+ bool malloced = false;
+ struct talloc_pool_hdr *pool_hdr = NULL;
+ size_t old_size = 0;
+ size_t new_size = 0;
+
+ /* size zero is equivalent to free() */
+ if (unlikely(size == 0)) {
+ talloc_unlink(context, ptr);
+ return NULL;
+ }
+
+ if (unlikely(size >= MAX_TALLOC_SIZE)) {
+ return NULL;
+ }
+
+ /* realloc(NULL) is equivalent to malloc() */
+ if (ptr == NULL) {
+ return _talloc_named_const(context, size, name);
+ }
+
+ tc = talloc_chunk_from_ptr(ptr);
+
+ /* don't allow realloc on referenced pointers */
+ if (unlikely(tc->refs)) {
+ return NULL;
+ }
+
+ /* don't let anybody try to realloc a talloc_pool */
+ if (unlikely(tc->flags & TALLOC_FLAG_POOL)) {
+ return NULL;
+ }
+
+ /* handle realloc inside a talloc_pool */
+ if (unlikely(tc->flags & TALLOC_FLAG_POOLMEM)) {
+ pool_hdr = tc->pool;
+ }
+
+ /* don't shrink if we have less than 1k to gain */
+ if (size < tc->size && tc->limit == NULL) {
+ if (pool_hdr) {
+ void *next_tc = tc_next_chunk(tc);
+ TC_INVALIDATE_SHRINK_CHUNK(tc, size);
+ tc->size = size;
+ if (next_tc == pool_hdr->end) {
+ /* note: tc->size has changed, so this works */
+ pool_hdr->end = tc_next_chunk(tc);
+ }
+ return ptr;
+ } else if ((tc->size - size) < 1024) {
+ /*
+ * if we call TC_INVALIDATE_SHRINK_CHUNK() here
+ * we would need to call TC_UNDEFINE_GROW_CHUNK()
+ * after each realloc call, which slows down
+ * testing a lot :-(.
+ *
+ * That is why we only mark memory as undefined here.
+ */
+ TC_UNDEFINE_SHRINK_CHUNK(tc, size);
+
+ /* do not shrink if we have less than 1k to gain */
+ tc->size = size;
+ return ptr;
+ }
+ } else if (tc->size == size) {
+ /*
+ * do not change the pointer if it is exactly
+ * the same size.
+ */
+ return ptr;
+ }
+
+ /*
+ * by resetting magic we catch users of the old memory
+ *
+ * We mark this memory as free, and also over-stamp the talloc
+ * magic with the old-style magic.
+ *
+ * Why? This tries to avoid a memory read use-after-free from
+ * disclosing our talloc magic, which would then allow an
+ * attacker to prepare a valid header and so run a destructor.
+ *
+ * What else? We have to re-stamp back a valid normal magic
+ * on this memory once realloc() is done, as it will have done
+ * a memcpy() into the new valid memory. We can't do this in
+ * reverse as that would be a real use-after-free.
+ */
+ _talloc_chunk_set_free(tc, NULL);
+
+ if (pool_hdr) {
+ struct talloc_chunk *pool_tc;
+ void *next_tc = tc_next_chunk(tc);
+ size_t old_chunk_size = TC_ALIGN16(TC_HDR_SIZE + tc->size);
+ size_t new_chunk_size = TC_ALIGN16(TC_HDR_SIZE + size);
+ size_t space_needed;
+ size_t space_left;
+ unsigned int chunk_count = pool_hdr->object_count;
+
+ pool_tc = talloc_chunk_from_pool(pool_hdr);
+ if (!(pool_tc->flags & TALLOC_FLAG_FREE)) {
+ chunk_count -= 1;
+ }
+
+ if (chunk_count == 1) {
+ /*
+ * optimize for the case where 'tc' is the only
+ * chunk in the pool.
+ */
+ char *start = tc_pool_first_chunk(pool_hdr);
+ space_needed = new_chunk_size;
+ space_left = (char *)tc_pool_end(pool_hdr) - start;
+
+ if (space_left >= space_needed) {
+ size_t old_used = TC_HDR_SIZE + tc->size;
+ size_t new_used = TC_HDR_SIZE + size;
+ new_ptr = start;
+
+#if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_UNDEFINED)
+ {
+ /*
+ * The area from
+ * start -> tc may have
+ * been freed and thus been marked as
+ * VALGRIND_MEM_NOACCESS. Set it to
+ * VALGRIND_MEM_UNDEFINED so we can
+ * copy into it without valgrind errors.
+ * We can't just mark
+ * new_ptr -> new_ptr + old_used
+ * as this may overlap on top of tc,
+ * (which is why we use memmove, not
+ * memcpy below) hence the MIN.
+ */
+ size_t undef_len = MIN((((char *)tc) - ((char *)new_ptr)),old_used);
+ VALGRIND_MAKE_MEM_UNDEFINED(new_ptr, undef_len);
+ }
+#endif
+
+ memmove(new_ptr, tc, old_used);
+
+ tc = (struct talloc_chunk *)new_ptr;
+ TC_UNDEFINE_GROW_CHUNK(tc, size);
+
+ /*
+ * first we do not align the pool pointer
+ * because we want to invalidate the padding
+ * too.
+ */
+ pool_hdr->end = new_used + (char *)new_ptr;
+ tc_invalidate_pool(pool_hdr);
+
+ /* now the aligned pointer */
+ pool_hdr->end = new_chunk_size + (char *)new_ptr;
+ goto got_new_ptr;
+ }
+
+ next_tc = NULL;
+ }
+
+ if (new_chunk_size == old_chunk_size) {
+ TC_UNDEFINE_GROW_CHUNK(tc, size);
+ _talloc_chunk_set_not_free(tc);
+ tc->size = size;
+ return ptr;
+ }
+
+ if (next_tc == pool_hdr->end) {
+ /*
+ * optimize for the case where 'tc' is the last
+ * chunk in the pool.
+ */
+ space_needed = new_chunk_size - old_chunk_size;
+ space_left = tc_pool_space_left(pool_hdr);
+
+ if (space_left >= space_needed) {
+ TC_UNDEFINE_GROW_CHUNK(tc, size);
+ _talloc_chunk_set_not_free(tc);
+ tc->size = size;
+ pool_hdr->end = tc_next_chunk(tc);
+ return ptr;
+ }
+ }
+
+ new_ptr = tc_alloc_pool(tc, size + TC_HDR_SIZE, 0);
+
+ if (new_ptr == NULL) {
+ /*
+ * Couldn't allocate from pool (pool size
+ * counts as already allocated for memlimit
+ * purposes). We must check memory limit
+ * before any real malloc.
+ */
+ if (tc->limit) {
+ /*
+ * Note we're doing an extra malloc,
+ * on top of the pool size, so account
+ * for size only, not the difference
+ * between old and new size.
+ */
+ if (!talloc_memlimit_check(tc->limit, size)) {
+ _talloc_chunk_set_not_free(tc);
+ errno = ENOMEM;
+ return NULL;
+ }
+ }
+ new_ptr = malloc(TC_HDR_SIZE+size);
+ malloced = true;
+ new_size = size;
+ }
+
+ if (new_ptr) {
+ memcpy(new_ptr, tc, MIN(tc->size,size) + TC_HDR_SIZE);
+
+ _tc_free_poolmem(tc, __location__ "_talloc_realloc");
+ }
+ }
+ else {
+ /* We're doing realloc here, so record the difference. */
+ old_size = tc->size;
+ new_size = size;
+ /*
+ * We must check memory limit
+ * before any real realloc.
+ */
+ if (tc->limit && (size > old_size)) {
+ if (!talloc_memlimit_check(tc->limit,
+ (size - old_size))) {
+ _talloc_chunk_set_not_free(tc);
+ errno = ENOMEM;
+ return NULL;
+ }
+ }
+ new_ptr = realloc(tc, size + TC_HDR_SIZE);
+ }
+got_new_ptr:
+
+ if (unlikely(!new_ptr)) {
+ /*
+ * Ok, this is a strange spot. We have to put back
+ * the old talloc_magic and any flags, except the
+ * TALLOC_FLAG_FREE as this was not free'ed by the
+ * realloc() call after all
+ */
+ _talloc_chunk_set_not_free(tc);
+ return NULL;
+ }
+
+ /*
+ * tc is now the new value from realloc(), the old memory we
+ * can't access any more and was preemptively marked as
+ * TALLOC_FLAG_FREE before the call. Now we mark it as not
+ * free again
+ */
+ tc = (struct talloc_chunk *)new_ptr;
+ _talloc_chunk_set_not_free(tc);
+ if (malloced) {
+ tc->flags &= ~TALLOC_FLAG_POOLMEM;
+ }
+ if (tc->parent) {
+ tc->parent->child = tc;
+ }
+ if (tc->child) {
+ tc->child->parent = tc;
+ }
+
+ if (tc->prev) {
+ tc->prev->next = tc;
+ }
+ if (tc->next) {
+ tc->next->prev = tc;
+ }
+
+ if (new_size > old_size) {
+ talloc_memlimit_grow(tc->limit, new_size - old_size);
+ } else if (new_size < old_size) {
+ talloc_memlimit_shrink(tc->limit, old_size - new_size);
+ }
+
+ tc->size = size;
+ _tc_set_name_const(tc, name);
+
+ return TC_PTR_FROM_CHUNK(tc);
+}
+
+/*
+ a wrapper around talloc_steal() for situations where you are moving a pointer
+ between two structures, and want the old pointer to be set to NULL
+*/
+_PUBLIC_ void *_talloc_move(const void *new_ctx, const void *_pptr)
+{
+ const void **pptr = discard_const_p(const void *,_pptr);
+ void *ret = talloc_steal(new_ctx, discard_const_p(void, *pptr));
+ (*pptr) = NULL;
+ return ret;
+}
+
+enum talloc_mem_count_type {
+ TOTAL_MEM_SIZE,
+ TOTAL_MEM_BLOCKS,
+ TOTAL_MEM_LIMIT,
+};
+
+static inline size_t _talloc_total_mem_internal(const void *ptr,
+ enum talloc_mem_count_type type,
+ struct talloc_memlimit *old_limit,
+ struct talloc_memlimit *new_limit)
+{
+ size_t total = 0;
+ struct talloc_chunk *c, *tc;
+
+ if (ptr == NULL) {
+ ptr = null_context;
+ }
+ if (ptr == NULL) {
+ return 0;
+ }
+
+ tc = talloc_chunk_from_ptr(ptr);
+
+ if (old_limit || new_limit) {
+ if (tc->limit && tc->limit->upper == old_limit) {
+ tc->limit->upper = new_limit;
+ }
+ }
+
+ /* optimize in the memlimits case */
+ if (type == TOTAL_MEM_LIMIT &&
+ tc->limit != NULL &&
+ tc->limit != old_limit &&
+ tc->limit->parent == tc) {
+ return tc->limit->cur_size;
+ }
+
+ if (tc->flags & TALLOC_FLAG_LOOP) {
+ return 0;
+ }
+
+ tc->flags |= TALLOC_FLAG_LOOP;
+
+ if (old_limit || new_limit) {
+ if (old_limit == tc->limit) {
+ tc->limit = new_limit;
+ }
+ }
+
+ switch (type) {
+ case TOTAL_MEM_SIZE:
+ if (likely(tc->name != TALLOC_MAGIC_REFERENCE)) {
+ total = tc->size;
+ }
+ break;
+ case TOTAL_MEM_BLOCKS:
+ total++;
+ break;
+ case TOTAL_MEM_LIMIT:
+ if (likely(tc->name != TALLOC_MAGIC_REFERENCE)) {
+ /*
+ * Don't count memory allocated from a pool
+ * when calculating limits. Only count the
+ * pool itself.
+ */
+ if (!(tc->flags & TALLOC_FLAG_POOLMEM)) {
+ if (tc->flags & TALLOC_FLAG_POOL) {
+ /*
+ * If this is a pool, the allocated
+ * size is in the pool header, and
+ * remember to add in the prefix
+ * length.
+ */
+ struct talloc_pool_hdr *pool_hdr
+ = talloc_pool_from_chunk(tc);
+ total = pool_hdr->poolsize +
+ TC_HDR_SIZE +
+ TP_HDR_SIZE;
+ } else {
+ total = tc->size + TC_HDR_SIZE;
+ }
+ }
+ }
+ break;
+ }
+ for (c = tc->child; c; c = c->next) {
+ total += _talloc_total_mem_internal(TC_PTR_FROM_CHUNK(c), type,
+ old_limit, new_limit);
+ }
+
+ tc->flags &= ~TALLOC_FLAG_LOOP;
+
+ return total;
+}
+
+/*
+ return the total size of a talloc pool (subtree)
+*/
+_PUBLIC_ size_t talloc_total_size(const void *ptr)
+{
+ return _talloc_total_mem_internal(ptr, TOTAL_MEM_SIZE, NULL, NULL);
+}
+
+/*
+ return the total number of blocks in a talloc pool (subtree)
+*/
+_PUBLIC_ size_t talloc_total_blocks(const void *ptr)
+{
+ return _talloc_total_mem_internal(ptr, TOTAL_MEM_BLOCKS, NULL, NULL);
+}
+
+/*
+ return the number of external references to a pointer
+*/
+_PUBLIC_ size_t talloc_reference_count(const void *ptr)
+{
+ struct talloc_chunk *tc = talloc_chunk_from_ptr(ptr);
+ struct talloc_reference_handle *h;
+ size_t ret = 0;
+
+ for (h=tc->refs;h;h=h->next) {
+ ret++;
+ }
+ return ret;
+}
+
+/*
+ report on memory usage by all children of a pointer, giving a full tree view
+*/
+_PUBLIC_ void talloc_report_depth_cb(const void *ptr, int depth, int max_depth,
+ void (*callback)(const void *ptr,
+ int depth, int max_depth,
+ int is_ref,
+ void *private_data),
+ void *private_data)
+{
+ struct talloc_chunk *c, *tc;
+
+ if (ptr == NULL) {
+ ptr = null_context;
+ }
+ if (ptr == NULL) return;
+
+ tc = talloc_chunk_from_ptr(ptr);
+
+ if (tc->flags & TALLOC_FLAG_LOOP) {
+ return;
+ }
+
+ callback(ptr, depth, max_depth, 0, private_data);
+
+ if (max_depth >= 0 && depth >= max_depth) {
+ return;
+ }
+
+ tc->flags |= TALLOC_FLAG_LOOP;
+ for (c=tc->child;c;c=c->next) {
+ if (c->name == TALLOC_MAGIC_REFERENCE) {
+ struct talloc_reference_handle *h = (struct talloc_reference_handle *)TC_PTR_FROM_CHUNK(c);
+ callback(h->ptr, depth + 1, max_depth, 1, private_data);
+ } else {
+ talloc_report_depth_cb(TC_PTR_FROM_CHUNK(c), depth + 1, max_depth, callback, private_data);
+ }
+ }
+ tc->flags &= ~TALLOC_FLAG_LOOP;
+}
+
+static void talloc_report_depth_FILE_helper(const void *ptr, int depth, int max_depth, int is_ref, void *_f)
+{
+ const char *name = __talloc_get_name(ptr);
+ struct talloc_chunk *tc;
+ FILE *f = (FILE *)_f;
+
+ if (is_ref) {
+ fprintf(f, "%*sreference to: %s\n", depth*4, "", name);
+ return;
+ }
+
+ tc = talloc_chunk_from_ptr(ptr);
+ if (tc->limit && tc->limit->parent == tc) {
+ fprintf(f, "%*s%-30s is a memlimit context"
+ " (max_size = %lu bytes, cur_size = %lu bytes)\n",
+ depth*4, "",
+ name,
+ (unsigned long)tc->limit->max_size,
+ (unsigned long)tc->limit->cur_size);
+ }
+
+ if (depth == 0) {
+ fprintf(f,"%stalloc report on '%s' (total %6lu bytes in %3lu blocks)\n",
+ (max_depth < 0 ? "full " :""), name,
+ (unsigned long)talloc_total_size(ptr),
+ (unsigned long)talloc_total_blocks(ptr));
+ return;
+ }
+
+ fprintf(f, "%*s%-30s contains %6lu bytes in %3lu blocks (ref %d) %p\n",
+ depth*4, "",
+ name,
+ (unsigned long)talloc_total_size(ptr),
+ (unsigned long)talloc_total_blocks(ptr),
+ (int)talloc_reference_count(ptr), ptr);
+
+#if 0
+ fprintf(f, "content: ");
+ if (talloc_total_size(ptr)) {
+ int tot = talloc_total_size(ptr);
+ int i;
+
+ for (i = 0; i < tot; i++) {
+ if ((((char *)ptr)[i] > 31) && (((char *)ptr)[i] < 126)) {
+ fprintf(f, "%c", ((char *)ptr)[i]);
+ } else {
+ fprintf(f, "~%02x", ((char *)ptr)[i]);
+ }
+ }
+ }
+ fprintf(f, "\n");
+#endif
+}
+
+/*
+ report on memory usage by all children of a pointer, giving a full tree view
+*/
+_PUBLIC_ void talloc_report_depth_file(const void *ptr, int depth, int max_depth, FILE *f)
+{
+ if (f) {
+ talloc_report_depth_cb(ptr, depth, max_depth, talloc_report_depth_FILE_helper, f);
+ fflush(f);
+ }
+}
+
+/*
+ report on memory usage by all children of a pointer, giving a full tree view
+*/
+_PUBLIC_ void talloc_report_full(const void *ptr, FILE *f)
+{
+ talloc_report_depth_file(ptr, 0, -1, f);
+}
+
+/*
+ report on memory usage by all children of a pointer
+*/
+_PUBLIC_ void talloc_report(const void *ptr, FILE *f)
+{
+ talloc_report_depth_file(ptr, 0, 1, f);
+}
+
+/*
+ enable tracking of the NULL context
+*/
+_PUBLIC_ void talloc_enable_null_tracking(void)
+{
+ if (null_context == NULL) {
+ null_context = _talloc_named_const(NULL, 0, "null_context");
+ if (autofree_context != NULL) {
+ talloc_reparent(NULL, null_context, autofree_context);
+ }
+ }
+}
+
+/*
+ enable tracking of the NULL context, not moving the autofree context
+ into the NULL context. This is needed for the talloc testsuite
+*/
+_PUBLIC_ void talloc_enable_null_tracking_no_autofree(void)
+{
+ if (null_context == NULL) {
+ null_context = _talloc_named_const(NULL, 0, "null_context");
+ }
+}
+
+/*
+ disable tracking of the NULL context
+*/
+_PUBLIC_ void talloc_disable_null_tracking(void)
+{
+ if (null_context != NULL) {
+ /* we have to move any children onto the real NULL
+ context */
+ struct talloc_chunk *tc, *tc2;
+ tc = talloc_chunk_from_ptr(null_context);
+ for (tc2 = tc->child; tc2; tc2=tc2->next) {
+ if (tc2->parent == tc) tc2->parent = NULL;
+ if (tc2->prev == tc) tc2->prev = NULL;
+ }
+ for (tc2 = tc->next; tc2; tc2=tc2->next) {
+ if (tc2->parent == tc) tc2->parent = NULL;
+ if (tc2->prev == tc) tc2->prev = NULL;
+ }
+ tc->child = NULL;
+ tc->next = NULL;
+ }
+ talloc_free(null_context);
+ null_context = NULL;
+}
+
+/*
+ enable leak reporting on exit
+*/
+_PUBLIC_ void talloc_enable_leak_report(void)
+{
+ talloc_enable_null_tracking();
+ talloc_report_null = true;
+ talloc_setup_atexit();
+}
+
+/*
+ enable full leak reporting on exit
+*/
+_PUBLIC_ void talloc_enable_leak_report_full(void)
+{
+ talloc_enable_null_tracking();
+ talloc_report_null_full = true;
+ talloc_setup_atexit();
+}
+
+/*
+ talloc and zero memory.
+*/
+_PUBLIC_ void *_talloc_zero(const void *ctx, size_t size, const char *name)
+{
+ void *p = _talloc_named_const(ctx, size, name);
+
+ if (p) {
+ memset(p, '\0', size);
+ }
+
+ return p;
+}
+
+/*
+ memdup with a talloc.
+*/
+_PUBLIC_ void *_talloc_memdup(const void *t, const void *p, size_t size, const char *name)
+{
+ void *newp = NULL;
+
+ if (likely(size > 0) && unlikely(p == NULL)) {
+ return NULL;
+ }
+
+ newp = _talloc_named_const(t, size, name);
+ if (likely(newp != NULL) && likely(size > 0)) {
+ memcpy(newp, p, size);
+ }
+
+ return newp;
+}
+
+static inline char *__talloc_strlendup(const void *t, const char *p, size_t len)
+{
+ char *ret;
+ struct talloc_chunk *tc = NULL;
+
+ ret = (char *)__talloc(t, len + 1, &tc);
+ if (unlikely(!ret)) return NULL;
+
+ memcpy(ret, p, len);
+ ret[len] = 0;
+
+ _tc_set_name_const(tc, ret);
+ return ret;
+}
+
+/*
+ strdup with a talloc
+*/
+_PUBLIC_ char *talloc_strdup(const void *t, const char *p)
+{
+ if (unlikely(!p)) return NULL;
+ return __talloc_strlendup(t, p, strlen(p));
+}
+
+/*
+ strndup with a talloc
+*/
+_PUBLIC_ char *talloc_strndup(const void *t, const char *p, size_t n)
+{
+ if (unlikely(!p)) return NULL;
+ return __talloc_strlendup(t, p, strnlen(p, n));
+}
+
+static inline char *__talloc_strlendup_append(char *s, size_t slen,
+ const char *a, size_t alen)
+{
+ char *ret;
+
+ ret = talloc_realloc(NULL, s, char, slen + alen + 1);
+ if (unlikely(!ret)) return NULL;
+
+ /* append the string and the trailing \0 */
+ memcpy(&ret[slen], a, alen);
+ ret[slen+alen] = 0;
+
+ _tc_set_name_const(talloc_chunk_from_ptr(ret), ret);
+ return ret;
+}
+
+/*
+ * Appends at the end of the string.
+ */
+_PUBLIC_ char *talloc_strdup_append(char *s, const char *a)
+{
+ if (unlikely(!s)) {
+ return talloc_strdup(NULL, a);
+ }
+
+ if (unlikely(!a)) {
+ return s;
+ }
+
+ return __talloc_strlendup_append(s, strlen(s), a, strlen(a));
+}
+
+/*
+ * Appends at the end of the talloc'ed buffer,
+ * not the end of the string.
+ */
+_PUBLIC_ char *talloc_strdup_append_buffer(char *s, const char *a)
+{
+ size_t slen;
+
+ if (unlikely(!s)) {
+ return talloc_strdup(NULL, a);
+ }
+
+ if (unlikely(!a)) {
+ return s;
+ }
+
+ slen = talloc_get_size(s);
+ if (likely(slen > 0)) {
+ slen--;
+ }
+
+ return __talloc_strlendup_append(s, slen, a, strlen(a));
+}
+
+/*
+ * Appends at the end of the string.
+ */
+_PUBLIC_ char *talloc_strndup_append(char *s, const char *a, size_t n)
+{
+ if (unlikely(!s)) {
+ return talloc_strndup(NULL, a, n);
+ }
+
+ if (unlikely(!a)) {
+ return s;
+ }
+
+ return __talloc_strlendup_append(s, strlen(s), a, strnlen(a, n));
+}
+
+/*
+ * Appends at the end of the talloc'ed buffer,
+ * not the end of the string.
+ */
+_PUBLIC_ char *talloc_strndup_append_buffer(char *s, const char *a, size_t n)
+{
+ size_t slen;
+
+ if (unlikely(!s)) {
+ return talloc_strndup(NULL, a, n);
+ }
+
+ if (unlikely(!a)) {
+ return s;
+ }
+
+ slen = talloc_get_size(s);
+ if (likely(slen > 0)) {
+ slen--;
+ }
+
+ return __talloc_strlendup_append(s, slen, a, strnlen(a, n));
+}
+
+#ifndef HAVE_VA_COPY
+#ifdef HAVE___VA_COPY
+#define va_copy(dest, src) __va_copy(dest, src)
+#else
+#define va_copy(dest, src) (dest) = (src)
+#endif
+#endif
+
+static struct talloc_chunk *_vasprintf_tc(const void *t,
+ const char *fmt,
+ va_list ap) PRINTF_ATTRIBUTE(2,0);
+
+static struct talloc_chunk *_vasprintf_tc(const void *t,
+ const char *fmt,
+ va_list ap)
+{
+ int vlen;
+ size_t len;
+ char *ret;
+ va_list ap2;
+ struct talloc_chunk *tc = NULL;
+ char buf[1024];
+
+ va_copy(ap2, ap);
+ vlen = vsnprintf(buf, sizeof(buf), fmt, ap2);
+ va_end(ap2);
+ if (unlikely(vlen < 0)) {
+ return NULL;
+ }
+ len = vlen;
+ if (unlikely(len + 1 < len)) {
+ return NULL;
+ }
+
+ ret = (char *)__talloc(t, len+1, &tc);
+ if (unlikely(!ret)) return NULL;
+
+ if (len < sizeof(buf)) {
+ memcpy(ret, buf, len+1);
+ } else {
+ va_copy(ap2, ap);
+ vsnprintf(ret, len+1, fmt, ap2);
+ va_end(ap2);
+ }
+
+ _tc_set_name_const(tc, ret);
+ return tc;
+}
+
+_PUBLIC_ char *talloc_vasprintf(const void *t, const char *fmt, va_list ap)
+{
+ struct talloc_chunk *tc = _vasprintf_tc(t, fmt, ap);
+ if (tc == NULL) {
+ return NULL;
+ }
+ return TC_PTR_FROM_CHUNK(tc);
+}
+
+
+/*
+ Perform string formatting, and return a pointer to newly allocated
+ memory holding the result, inside a memory pool.
+ */
+_PUBLIC_ char *talloc_asprintf(const void *t, const char *fmt, ...)
+{
+ va_list ap;
+ char *ret;
+
+ va_start(ap, fmt);
+ ret = talloc_vasprintf(t, fmt, ap);
+ va_end(ap);
+ return ret;
+}
+
+static inline char *__talloc_vaslenprintf_append(char *s, size_t slen,
+ const char *fmt, va_list ap)
+ PRINTF_ATTRIBUTE(3,0);
+
+static inline char *__talloc_vaslenprintf_append(char *s, size_t slen,
+ const char *fmt, va_list ap)
+{
+ ssize_t alen;
+ va_list ap2;
+ char c;
+
+ va_copy(ap2, ap);
+ /* this call looks strange, but it makes it work on older solaris boxes */
+ alen = vsnprintf(&c, 1, fmt, ap2);
+ va_end(ap2);
+
+ if (alen <= 0) {
+ /* Either the vsnprintf failed or the format resulted in
+ * no characters being formatted. In the former case, we
+ * ought to return NULL, in the latter we ought to return
+ * the original string. Most current callers of this
+ * function expect it to never return NULL.
+ */
+ return s;
+ }
+
+ s = talloc_realloc(NULL, s, char, slen + alen + 1);
+ if (!s) return NULL;
+
+ vsnprintf(s + slen, alen + 1, fmt, ap);
+
+ _tc_set_name_const(talloc_chunk_from_ptr(s), s);
+ return s;
+}
+
+/**
+ * Realloc @p s to append the formatted result of @p fmt and @p ap,
+ * and return @p s, which may have moved. Good for gradually
+ * accumulating output into a string buffer. Appends at the end
+ * of the string.
+ **/
+_PUBLIC_ char *talloc_vasprintf_append(char *s, const char *fmt, va_list ap)
+{
+ if (unlikely(!s)) {
+ return talloc_vasprintf(NULL, fmt, ap);
+ }
+
+ return __talloc_vaslenprintf_append(s, strlen(s), fmt, ap);
+}
+
+/**
+ * Realloc @p s to append the formatted result of @p fmt and @p ap,
+ * and return @p s, which may have moved. Always appends at the
+ * end of the talloc'ed buffer, not the end of the string.
+ **/
+_PUBLIC_ char *talloc_vasprintf_append_buffer(char *s, const char *fmt, va_list ap)
+{
+ size_t slen;
+
+ if (unlikely(!s)) {
+ return talloc_vasprintf(NULL, fmt, ap);
+ }
+
+ slen = talloc_get_size(s);
+ if (likely(slen > 0)) {
+ slen--;
+ }
+
+ return __talloc_vaslenprintf_append(s, slen, fmt, ap);
+}
+
+/*
+ Realloc @p s to append the formatted result of @p fmt and return @p
+ s, which may have moved. Good for gradually accumulating output
+ into a string buffer.
+ */
+_PUBLIC_ char *talloc_asprintf_append(char *s, const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ s = talloc_vasprintf_append(s, fmt, ap);
+ va_end(ap);
+ return s;
+}
+
+/*
+ Realloc @p s to append the formatted result of @p fmt and return @p
+ s, which may have moved. Good for gradually accumulating output
+ into a buffer.
+ */
+_PUBLIC_ char *talloc_asprintf_append_buffer(char *s, const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ s = talloc_vasprintf_append_buffer(s, fmt, ap);
+ va_end(ap);
+ return s;
+}
+
+_PUBLIC_ void talloc_asprintf_addbuf(char **ps, const char *fmt, ...)
+{
+ va_list ap;
+ char *s = *ps;
+ char *t = NULL;
+
+ if (s == NULL) {
+ return;
+ }
+
+ va_start(ap, fmt);
+ t = talloc_vasprintf_append_buffer(s, fmt, ap);
+ va_end(ap);
+
+ if (t == NULL) {
+ /* signal failure to the next caller */
+ TALLOC_FREE(s);
+ *ps = NULL;
+ } else {
+ *ps = t;
+ }
+}
+
+/*
+ alloc an array, checking for integer overflow in the array size
+*/
+_PUBLIC_ void *_talloc_array(const void *ctx, size_t el_size, unsigned count, const char *name)
+{
+ if (count >= MAX_TALLOC_SIZE/el_size) {
+ return NULL;
+ }
+ return _talloc_named_const(ctx, el_size * count, name);
+}
+
+/*
+ alloc an zero array, checking for integer overflow in the array size
+*/
+_PUBLIC_ void *_talloc_zero_array(const void *ctx, size_t el_size, unsigned count, const char *name)
+{
+ if (count >= MAX_TALLOC_SIZE/el_size) {
+ return NULL;
+ }
+ return _talloc_zero(ctx, el_size * count, name);
+}
+
+/*
+ realloc an array, checking for integer overflow in the array size
+*/
+_PUBLIC_ void *_talloc_realloc_array(const void *ctx, void *ptr, size_t el_size, unsigned count, const char *name)
+{
+ if (count >= MAX_TALLOC_SIZE/el_size) {
+ return NULL;
+ }
+ return _talloc_realloc(ctx, ptr, el_size * count, name);
+}
+
+/*
+ a function version of talloc_realloc(), so it can be passed as a function pointer
+ to libraries that want a realloc function (a realloc function encapsulates
+ all the basic capabilities of an allocation library, which is why this is useful)
+*/
+_PUBLIC_ void *talloc_realloc_fn(const void *context, void *ptr, size_t size)
+{
+ return _talloc_realloc(context, ptr, size, NULL);
+}
+
+
+static int talloc_autofree_destructor(void *ptr)
+{
+ autofree_context = NULL;
+ return 0;
+}
+
+/*
+ return a context which will be auto-freed on exit
+ this is useful for reducing the noise in leak reports
+*/
+_PUBLIC_ void *talloc_autofree_context(void)
+{
+ if (autofree_context == NULL) {
+ autofree_context = _talloc_named_const(NULL, 0, "autofree_context");
+ talloc_set_destructor(autofree_context, talloc_autofree_destructor);
+ talloc_setup_atexit();
+ }
+ return autofree_context;
+}
+
+_PUBLIC_ size_t talloc_get_size(const void *context)
+{
+ struct talloc_chunk *tc;
+
+ if (context == NULL) {
+ return 0;
+ }
+
+ tc = talloc_chunk_from_ptr(context);
+
+ return tc->size;
+}
+
+/*
+ find a parent of this context that has the given name, if any
+*/
+_PUBLIC_ void *talloc_find_parent_byname(const void *context, const char *name)
+{
+ struct talloc_chunk *tc;
+
+ if (context == NULL) {
+ return NULL;
+ }
+
+ tc = talloc_chunk_from_ptr(context);
+ while (tc) {
+ if (tc->name && strcmp(tc->name, name) == 0) {
+ return TC_PTR_FROM_CHUNK(tc);
+ }
+ while (tc && tc->prev) tc = tc->prev;
+ if (tc) {
+ tc = tc->parent;
+ }
+ }
+ return NULL;
+}
+
+/*
+ show the parentage of a context
+*/
+_PUBLIC_ void talloc_show_parents(const void *context, FILE *file)
+{
+ struct talloc_chunk *tc;
+
+ if (context == NULL) {
+ fprintf(file, "talloc no parents for NULL\n");
+ return;
+ }
+
+ tc = talloc_chunk_from_ptr(context);
+ fprintf(file, "talloc parents of '%s'\n", __talloc_get_name(context));
+ while (tc) {
+ fprintf(file, "\t'%s'\n", __talloc_get_name(TC_PTR_FROM_CHUNK(tc)));
+ while (tc && tc->prev) tc = tc->prev;
+ if (tc) {
+ tc = tc->parent;
+ }
+ }
+ fflush(file);
+}
+
+/*
+ return 1 if ptr is a parent of context
+*/
+static int _talloc_is_parent(const void *context, const void *ptr, int depth)
+{
+ struct talloc_chunk *tc;
+
+ if (context == NULL) {
+ return 0;
+ }
+
+ tc = talloc_chunk_from_ptr(context);
+ while (tc) {
+ if (depth <= 0) {
+ return 0;
+ }
+ if (TC_PTR_FROM_CHUNK(tc) == ptr) return 1;
+ while (tc && tc->prev) tc = tc->prev;
+ if (tc) {
+ tc = tc->parent;
+ depth--;
+ }
+ }
+ return 0;
+}
+
+/*
+ return 1 if ptr is a parent of context
+*/
+_PUBLIC_ int talloc_is_parent(const void *context, const void *ptr)
+{
+ return _talloc_is_parent(context, ptr, TALLOC_MAX_DEPTH);
+}
+
+/*
+ return the total size of memory used by this context and all children
+*/
+static inline size_t _talloc_total_limit_size(const void *ptr,
+ struct talloc_memlimit *old_limit,
+ struct talloc_memlimit *new_limit)
+{
+ return _talloc_total_mem_internal(ptr, TOTAL_MEM_LIMIT,
+ old_limit, new_limit);
+}
+
+static inline bool talloc_memlimit_check(struct talloc_memlimit *limit, size_t size)
+{
+ struct talloc_memlimit *l;
+
+ for (l = limit; l != NULL; l = l->upper) {
+ if (l->max_size != 0 &&
+ ((l->max_size <= l->cur_size) ||
+ (l->max_size - l->cur_size < size))) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+/*
+ Update memory limits when freeing a talloc_chunk.
+*/
+static void tc_memlimit_update_on_free(struct talloc_chunk *tc)
+{
+ size_t limit_shrink_size;
+
+ if (!tc->limit) {
+ return;
+ }
+
+ /*
+ * Pool entries don't count. Only the pools
+ * themselves are counted as part of the memory
+ * limits. Note that this also takes care of
+ * nested pools which have both flags
+ * TALLOC_FLAG_POOLMEM|TALLOC_FLAG_POOL set.
+ */
+ if (tc->flags & TALLOC_FLAG_POOLMEM) {
+ return;
+ }
+
+ /*
+ * If we are part of a memory limited context hierarchy
+ * we need to subtract the memory used from the counters
+ */
+
+ limit_shrink_size = tc->size+TC_HDR_SIZE;
+
+ /*
+ * If we're deallocating a pool, take into
+ * account the prefix size added for the pool.
+ */
+
+ if (tc->flags & TALLOC_FLAG_POOL) {
+ limit_shrink_size += TP_HDR_SIZE;
+ }
+
+ talloc_memlimit_shrink(tc->limit, limit_shrink_size);
+
+ if (tc->limit->parent == tc) {
+ free(tc->limit);
+ }
+
+ tc->limit = NULL;
+}
+
+/*
+ Increase memory limit accounting after a malloc/realloc.
+*/
+static void talloc_memlimit_grow(struct talloc_memlimit *limit,
+ size_t size)
+{
+ struct talloc_memlimit *l;
+
+ for (l = limit; l != NULL; l = l->upper) {
+ size_t new_cur_size = l->cur_size + size;
+ if (new_cur_size < l->cur_size) {
+ talloc_abort("logic error in talloc_memlimit_grow\n");
+ return;
+ }
+ l->cur_size = new_cur_size;
+ }
+}
+
+/*
+ Decrease memory limit accounting after a free/realloc.
+*/
+static void talloc_memlimit_shrink(struct talloc_memlimit *limit,
+ size_t size)
+{
+ struct talloc_memlimit *l;
+
+ for (l = limit; l != NULL; l = l->upper) {
+ if (l->cur_size < size) {
+ talloc_abort("logic error in talloc_memlimit_shrink\n");
+ return;
+ }
+ l->cur_size = l->cur_size - size;
+ }
+}
+
+_PUBLIC_ int talloc_set_memlimit(const void *ctx, size_t max_size)
+{
+ struct talloc_chunk *tc = talloc_chunk_from_ptr(ctx);
+ struct talloc_memlimit *orig_limit;
+ struct talloc_memlimit *limit = NULL;
+
+ if (tc->limit && tc->limit->parent == tc) {
+ tc->limit->max_size = max_size;
+ return 0;
+ }
+ orig_limit = tc->limit;
+
+ limit = malloc(sizeof(struct talloc_memlimit));
+ if (limit == NULL) {
+ return 1;
+ }
+ limit->parent = tc;
+ limit->max_size = max_size;
+ limit->cur_size = _talloc_total_limit_size(ctx, tc->limit, limit);
+
+ if (orig_limit) {
+ limit->upper = orig_limit;
+ } else {
+ limit->upper = NULL;
+ }
+
+ return 0;
+}