Add MALLOC_DEBUG enhancements.

* Makes malloc() behave like calloc().  It will return a memory block
filled with 0x55.  A nonzero value.

* Makes free() fill the released memory block and boundary fence's with
0xdeaddead.  Any pointer use after free is going to have a pointer
pointing to 0xdeaddead.  The 0xdeaddead pointer is usually an invalid
memory address so a crash is expected.

* Puts the freed memory block into a circular array so it is not reused
immediately.

* When the circular array rotates out a memory block to the heap it checks
that the memory has not been altered from 0xdeaddead.

* Made the astmm_log message wording better.

* Made crash if the DO_CRASH menuselect option is enabled and something is
found.

* Fixed a potential alignment issue on 64 bit systems.
struct ast_region.data[] should now be aligned correctly for all
platforms.

* Extracted region_check_fences() from __ast_free_region() and
handle_memory_show().

* Updated handle_memory_show() CLI usage help.

Review: https://reviewboard.asterisk.org/r/2182/
........

Merged revisions 376029 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 376030 from http://svn.asterisk.org/svn/asterisk/branches/10
........

Merged revisions 376048 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@376049 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 7 insertions, 3 deletions

diff --git a/main/asterisk.c b/main/asterisk.c
index 80643b15a..b9e45d01d 100644
--- a/main/asterisk.c
+++ b/main/asterisk.c
@@ -3545,6 +3545,10 @@ int main(int argc, char *argv[])
 	int moduleresult;         /*!< Result from the module load subsystem */
 	struct rlimit l;
 
+#if defined(__AST_DEBUG_MALLOC)
+	__ast_mm_init_phase_1();
+#endif	/* defined(__AST_DEBUG_MALLOC) */
+
 	/* Remember original args for restart */
 	if (argc > ARRAY_LEN(_argv) - 1) {
 		fprintf(stderr, "Truncating argument size to %d\n", (int)ARRAY_LEN(_argv) - 1);
@@ -4231,9 +4235,9 @@ int main(int argc, char *argv[])
 
 	pthread_sigmask(SIG_UNBLOCK, &sigs, NULL);
 
-#ifdef __AST_DEBUG_MALLOC
-	__ast_mm_init();
-#endif
+#if defined(__AST_DEBUG_MALLOC)
+	__ast_mm_init_phase_2();
+#endif	/* defined(__AST_DEBUG_MALLOC) */
 
 	ast_lastreloadtime = ast_startuptime = ast_tvnow();
 	ast_cli_register_multiple(cli_asterisk, ARRAY_LEN(cli_asterisk));