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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
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Merged revisions 376030 from http://svn.asterisk.org/svn/asterisk/branches/10
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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
This commit is contained in:
Richard Mudgett
2012-11-08 17:38:31 +00:00
parent f2bb9afe17
commit 3a9640b605
5 changed files with 456 additions and 133 deletions
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29
include/asterisk/utils.h
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@@ -729,32 +729,27 @@ int ast_parse_digest(const char *digest, struct ast_http_digest *d, int request,
#ifdef AST_DEVMODE
void __ast_assert_failed(int condition, const char *condition_str, const char *file, int line, const char *function);
#define ast_assert(a) _ast_assert(a, # a, __FILE__, __LINE__, __PRETTY_FUNCTION__)
static void force_inline _ast_assert(int condition, const char *condition_str,
const char *file, int line, const char *function)
static void force_inline _ast_assert(int condition, const char *condition_str, const char *file, int line, const char *function)
{
if (__builtin_expect(!condition, 1)) {
/* Attempt to put it into the logger, but hope that at least someone saw the
* message on stderr ... */
ast_log(__LOG_ERROR, file, line, function, "FRACK!, Failed assertion %s (%d)\n",
condition_str, condition);
fprintf(stderr, "FRACK!, Failed assertion %s (%d) at line %d in %s of %s\n",
condition_str, condition, line, function, file);
/* Give the logger a chance to get the message out, just in case we abort(), or
* Asterisk crashes due to whatever problem just happened after we exit ast_assert(). */
usleep(1);
#ifdef DO_CRASH
abort();
/* Just in case abort() doesn't work or something else super silly,
* and for Qwell's amusement. */
*((int*)0)=0;
#endif
__ast_assert_failed(condition, condition_str, file, line, function);
}
}
#else
#define ast_assert(a)
#endif
/*!
* \brief Force a crash if DO_CRASH is defined.
*
* \note If DO_CRASH is not defined then the function returns.
*
* \return Nothing
*/
void ast_do_crash(void);
#include "asterisk/strings.h"
/*!