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Add MALLOC_DEBUG enhancements.

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* 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/
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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


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@376048 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Richard Mudgett
2012-11-08 17:26:16 +00:00
parent a65fbf8012
commit 1bba4b00b2
5 changed files with 456 additions and 133 deletions
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10
main/asterisk.c
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@@ -3458,6 +3458,10 @@ 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);
@@ -4141,9 +4145,9 @@ 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));