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-rw-r--r--source4/lib/talloc.c133
-rw-r--r--source4/torture/config.mk3
-rw-r--r--source4/torture/local/talloc.c115
-rw-r--r--source4/torture/torture.c17
4 files changed, 220 insertions, 48 deletions
diff --git a/source4/lib/talloc.c b/source4/lib/talloc.c
index 5d22754f5b..d0056d7b2a 100644
--- a/source4/lib/talloc.c
+++ b/source4/lib/talloc.c
@@ -32,13 +32,20 @@
static const void *null_context;
+struct talloc_reference_handle {
+ struct talloc_reference_handle *next, *prev;
+ void *ptr;
+};
+
+typedef int (*talloc_destructor_t)(void *);
+
struct talloc_chunk {
struct talloc_chunk *next, *prev;
struct talloc_chunk *parent, *child;
+ struct talloc_reference_handle *refs;
size_t size;
uint_t magic;
- uint_t ref_count;
- int (*destructor)(void *);
+ talloc_destructor_t destructor;
const char *name;
};
@@ -78,10 +85,10 @@ void *_talloc(const void *context, size_t size)
tc->size = size;
tc->magic = TALLOC_MAGIC;
- tc->ref_count = 1;
tc->destructor = NULL;
tc->child = NULL;
tc->name = NULL;
+ tc->refs = NULL;
if (context) {
struct talloc_chunk *parent = talloc_chunk_from_ptr(context);
@@ -114,14 +121,11 @@ void talloc_set_destructor(const void *ptr, int (*destructor)(void *))
}
/*
- increase the reference count on a piece of memory. To decrease the
- reference count call talloc_free(), which will free the memory if
- the reference count reaches zero
+ increase the reference count on a piece of memory.
*/
void talloc_increase_ref_count(const void *ptr)
{
- struct talloc_chunk *tc = talloc_chunk_from_ptr(ptr);
- tc->ref_count++;
+ talloc_reference(null_context, ptr);
}
/*
@@ -129,8 +133,14 @@ void talloc_increase_ref_count(const void *ptr)
*/
static int talloc_reference_destructor(void *ptr)
{
- void **handle = ptr;
- talloc_free(*handle);
+ struct talloc_reference_handle *handle = ptr;
+ struct talloc_chunk *tc1 = talloc_chunk_from_ptr(ptr);
+ struct talloc_chunk *tc2 = talloc_chunk_from_ptr(handle->ptr);
+ if (tc1->destructor != (talloc_destructor_t)-1) {
+ tc1->destructor = NULL;
+ }
+ DLIST_REMOVE(tc2->refs, handle);
+ talloc_free(handle);
return 0;
}
@@ -145,8 +155,9 @@ static int talloc_reference_destructor(void *ptr)
*/
void *talloc_reference(const void *context, const void *ptr)
{
- void **handle;
- handle = talloc_named_const(context, sizeof(void *), ".reference");
+ struct talloc_chunk *tc = talloc_chunk_from_ptr(ptr);
+ struct talloc_reference_handle *handle;
+ handle = talloc_named_const(context, sizeof(*handle), ".reference");
if (handle == NULL) {
return NULL;
}
@@ -154,9 +165,9 @@ void *talloc_reference(const void *context, const void *ptr)
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);
- talloc_increase_ref_count(ptr);
- *handle = discard_const(ptr);
- return *handle;
+ handle->ptr = discard_const(ptr);
+ DLIST_ADD(tc->refs, handle);
+ return handle->ptr;
}
@@ -280,7 +291,7 @@ void *talloc_init(const char *fmt, ...) _PRINTF_ATTRIBUTE(1,2)
*/
int talloc_free(void *ptr)
{
- struct talloc_chunk *tc, *tc2, *next;
+ struct talloc_chunk *tc;
if (ptr == NULL) {
return -1;
@@ -288,26 +299,29 @@ int talloc_free(void *ptr)
tc = talloc_chunk_from_ptr(ptr);
- if (tc->ref_count > 1) {
- tc->ref_count--;
- return -1;
+ if (tc->refs) {
+ talloc_reference_destructor(tc->refs);
+ return 0;
}
- /* while processing the free, increase the reference count
- so we don't recurse into this function */
- tc->ref_count++;
if (tc->destructor) {
- if (tc->destructor(ptr) == -1) {
- tc->ref_count--;
+ talloc_destructor_t d = tc->destructor;
+ if (d == (talloc_destructor_t)-1) {
+ return -1;
+ }
+ tc->destructor = (talloc_destructor_t)-1;
+ if (d(ptr) == -1) {
+ tc->destructor = d;
return -1;
}
+ tc->destructor = NULL;
}
- for (tc2=tc->child;tc2;tc2=next) {
- next = tc2->next;
- talloc_free(tc2 + 1);
+ while (tc->child) {
+ talloc_free(talloc_steal(tc->parent?tc->parent+1:null_context,
+ tc->child+1));
}
-
+
if (tc->parent) {
DLIST_REMOVE(tc->parent->child, tc);
if (tc->parent->child) {
@@ -318,10 +332,6 @@ int talloc_free(void *ptr)
if (tc->next) tc->next->prev = tc->prev;
}
- if (tc->child) {
- tc->child->parent = tc->parent;
- }
-
tc->magic = TALLOC_MAGIC_FREE;
free(tc);
@@ -352,6 +362,11 @@ void *_talloc_realloc(const void *context, void *ptr, size_t size, const char *n
tc = talloc_chunk_from_ptr(ptr);
+ /* don't allow realloc on referenced pointers */
+ if (tc->refs) {
+ return NULL;
+ }
+
/* by resetting magic we catch users of the old memory */
tc->magic = TALLOC_MAGIC_FREE;
@@ -382,7 +397,7 @@ void *_talloc_realloc(const void *context, void *ptr, size_t size, const char *n
/*
move a lump of memory from one talloc context to another return the
- ptr on success, or NUL if it could not be transferred
+ ptr on success, or NULL if it could not be transferred
*/
void *talloc_steal(const void *new_ctx, const void *ptr)
{
@@ -393,10 +408,26 @@ void *talloc_steal(const void *new_ctx, const void *ptr)
}
tc = talloc_chunk_from_ptr(ptr);
+
+ if (new_ctx == NULL) {
+ if (tc->parent) {
+ DLIST_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(ptr);
+ }
+
new_tc = talloc_chunk_from_ptr(new_ctx);
if (tc == new_tc) {
- discard_const(ptr);
+ return discard_const(ptr);
}
if (tc->parent) {
@@ -419,10 +450,19 @@ void *talloc_steal(const void *new_ctx, const void *ptr)
/*
return the total size of a talloc pool (subtree)
*/
-static off_t talloc_total_size(const void *ptr)
+off_t talloc_total_size(const void *ptr)
{
off_t total = 0;
- struct talloc_chunk *c, *tc = talloc_chunk_from_ptr(ptr);
+ struct talloc_chunk *c, *tc;
+
+ if (ptr == NULL) {
+ ptr = null_context;
+ }
+ if (ptr == NULL) {
+ return 0;
+ }
+
+ tc = talloc_chunk_from_ptr(ptr);
total = tc->size;
for (c=tc->child;c;c=c->next) {
@@ -447,6 +487,21 @@ static off_t talloc_total_blocks(const void *ptr)
}
/*
+ return the number of external references to a pointer
+*/
+static int talloc_reference_count(const void *ptr)
+{
+ struct talloc_chunk *tc = talloc_chunk_from_ptr(ptr);
+ struct talloc_reference_handle *h;
+ int 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
*/
static void talloc_report_depth(const void *ptr, FILE *f, int depth)
@@ -456,8 +511,8 @@ static void talloc_report_depth(const void *ptr, FILE *f, int depth)
for (c=tc->child;c;c=c->next) {
const char *name = talloc_get_name(c+1);
if (strcmp(name, ".reference") == 0) {
- void **handle = (void *)(c+1);
- const char *name2 = talloc_get_name(*handle);
+ struct talloc_reference_handle *handle = (void *)(c+1);
+ const char *name2 = talloc_get_name(handle->ptr);
fprintf(f, "%*sreference to: %s\n", depth*4, "", name2);
} else {
fprintf(f, "%*s%-30s contains %6lu bytes in %3lu blocks (ref %d)\n",
@@ -465,7 +520,7 @@ static void talloc_report_depth(const void *ptr, FILE *f, int depth)
name,
(unsigned long)talloc_total_size(c+1),
(unsigned long)talloc_total_blocks(c+1),
- c->ref_count);
+ talloc_reference_count(c+1));
talloc_report_depth(c+1, f, depth+1);
}
}
diff --git a/source4/torture/config.mk b/source4/torture/config.mk
index 9c7395e572..6403d0c3a7 100644
--- a/source4/torture/config.mk
+++ b/source4/torture/config.mk
@@ -98,7 +98,8 @@ REQUIRED_SUBSYSTEMS = \
# Start SUBSYSTEM TORTURE_LOCAL
[SUBSYSTEM::TORTURE_LOCAL]
ADD_OBJ_FILES = \
- torture/local/iconv.o
+ torture/local/iconv.o \
+ torture/local/talloc.o
REQUIRED_SUBSYSTEMS = \
LIBSMB
# End SUBSYSTEM TORTURE_LOCAL
diff --git a/source4/torture/local/talloc.c b/source4/torture/local/talloc.c
new file mode 100644
index 0000000000..49cdc958b0
--- /dev/null
+++ b/source4/torture/local/talloc.c
@@ -0,0 +1,115 @@
+/*
+ Unix SMB/CIFS implementation.
+
+ local testing of talloc routines.
+
+ Copyright (C) Andrew Tridgell 2004
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+
+/*
+ test references
+*/
+static BOOL test_ref1(void)
+{
+ void *p1, *p2, *ref, *r1;
+
+ printf("TESTING SINGLE REFERENCE FREE\n");
+
+ p1 = talloc_named_const(NULL, 1, "p1");
+ p2 = talloc_named_const(p1, 1, "p2");
+ talloc_named_const(p1, 1, "x1");
+ talloc_named_const(p1, 1, "x2");
+ talloc_named_const(p1, 1, "x3");
+
+ r1 = talloc_named_const(NULL, 1, "r1");
+ ref = talloc_reference(r1, p2);
+ talloc_report_full(NULL, stdout);
+
+ printf("Freeing p2\n");
+ talloc_free(p2);
+ talloc_report_full(NULL, stdout);
+
+ printf("Freeing p1\n");
+ talloc_free(p1);
+ talloc_report_full(NULL, stdout);
+
+ printf("Freeing r1\n");
+ talloc_free(r1);
+ talloc_report_full(NULL, stdout);
+
+ if (talloc_total_size(NULL) != 0) {
+ printf("non-zero total size\n");
+ return False;
+ }
+
+ return True;
+}
+
+/*
+ test references
+*/
+static BOOL test_ref2(void)
+{
+ void *p1, *p2, *ref, *r1;
+
+ printf("TESTING DOUBLE REFERENCE FREE\n");
+
+ p1 = talloc_named_const(NULL, 1, "p1");
+ talloc_named_const(p1, 1, "x1");
+ talloc_named_const(p1, 1, "x2");
+ talloc_named_const(p1, 1, "x3");
+ p2 = talloc_named_const(p1, 1, "p2");
+
+ r1 = talloc_named_const(NULL, 1, "r1");
+ ref = talloc_reference(r1, p2);
+ talloc_report_full(NULL, stdout);
+ printf("Freeing ref\n");
+ talloc_free(ref);
+ talloc_report_full(NULL, stdout);
+ printf("Freeing p2\n");
+ talloc_free(p2);
+ talloc_report_full(NULL, stdout);
+ printf("Freeing p1\n");
+ talloc_free(p1);
+ talloc_report_full(NULL, stdout);
+ printf("Freeing r1\n");
+ talloc_free(r1);
+ talloc_report_full(NULL, stdout);
+
+ if (talloc_total_size(NULL) != 0) {
+ printf("non-zero total size\n");
+ return False;
+ }
+
+ return True;
+}
+
+
+BOOL torture_local_talloc(int dummy)
+{
+ BOOL ret = True;
+
+ init_iconv();
+
+ ret &= test_ref1();
+ ret &= test_ref2();
+
+ return True;
+}
diff --git a/source4/torture/torture.c b/source4/torture/torture.c
index 5db861124b..c6af807357 100644
--- a/source4/torture/torture.c
+++ b/source4/torture/torture.c
@@ -94,10 +94,10 @@ BOOL torture_open_connection_share(struct smbcli_state **c,
flags |= SMBCLI_FULL_CONNECTION_USE_KERBEROS;
status = smbcli_full_connection(c, lp_netbios_name(),
- hostname, NULL,
- sharename, "?????",
- username, username[0]?userdomain:"",
- password, flags, &retry);
+ hostname, NULL,
+ sharename, "?????",
+ username, username[0]?userdomain:"",
+ password, flags, &retry);
if (!NT_STATUS_IS_OK(status)) {
printf("Failed to open connection - %s\n", nt_errstr(status));
return False;
@@ -858,10 +858,10 @@ static BOOL run_tcon_devtype_test(int dummy)
const char *password = lp_parm_string(-1, "torture", "password");
status = smbcli_full_connection(&cli1, lp_netbios_name(),
- host, NULL,
- share, "?????",
- username, userdomain,
- password, flags, &retry);
+ host, NULL,
+ share, "?????",
+ username, userdomain,
+ password, flags, &retry);
if (!NT_STATUS_IS_OK(status)) {
printf("could not open connection\n");
@@ -4247,6 +4247,7 @@ static struct {
/* local (no server) testers */
{"LOCAL-NTLMSSP", torture_ntlmssp_self_check, 0},
{"LOCAL-ICONV", torture_local_iconv, 0},
+ {"LOCAL-TALLOC", torture_local_talloc, 0},
/* ldap testers */
{"LDAP-BASIC", torture_ldap_basic, 0},
generated by cgit (git 2.34.1) at 2024-12-04 23:03:49 +0000