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Add backtrace generation to MALLOC_DEBUG memory corruption reports

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This patch allows astmm to access the backtrace generation code in Asterisk.
When memory is allocated, a backtrace is created and stored with the memory
region that tracks the allocation. If a memory corruption is detected, the
backtrace is printed to the astmm log. The backtrace will make use of the
BETTER_BACKTRACES build option if available.

As a result, this patch moves the backtrace generation code into its own file
and uses the non-wrapped versions of the C library memory allocation routines.
This allows the memory allocation code to safely use the backtrace generation
routines without infinitely recursing.

Review: https://reviewboard.asterisk.org/r/2567


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@391012 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Matthew Jordan
2013-06-08 22:09:07 +00:00
parent 2fe6b6a533
commit c43f380d03
8 changed files with 360 additions and 256 deletions
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62
include/asterisk/logger.h
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@@ -80,7 +80,10 @@ struct ast_callid;
void ast_log_callid(int level, const char *file, int line, const char *function, struct ast_callid *callid, const char *fmt, ...)
__attribute__((format(printf, 6, 7)));
void ast_backtrace(void);
/*!
* \brief Log a backtrace of the current thread's execution stack to the Asterisk log
*/
void ast_log_backtrace(void);
/*! \brief Reload logger without rotating log files */
int logger_reload(void);
@@ -362,63 +365,6 @@ void ast_callid_strnprint(char *buffer, size_t buffer_size, struct ast_callid *c
#define ast_verb(level, ...) __ast_verbose(__FILE__, __LINE__, __PRETTY_FUNCTION__, level, __VA_ARGS__)
#define ast_verb_callid(level, callid, ...) __ast_verbose_callid(__FILE__, __LINE__, __PRETTY_FUNCTION__, level, callid, __VA_ARGS__)
#ifndef _LOGGER_BACKTRACE_H
#define _LOGGER_BACKTRACE_H
#ifdef HAVE_BKTR
#define AST_MAX_BT_FRAMES 32
/* \brief
*
* A structure to hold backtrace information. This structure provides an easy means to
* store backtrace information or pass backtraces to other functions.
*/
struct ast_bt {
/*! The addresses of the stack frames. This is filled in by calling the glibc backtrace() function */
void *addresses[AST_MAX_BT_FRAMES];
/*! The number of stack frames in the backtrace */
int num_frames;
/*! Tells if the ast_bt structure was dynamically allocated */
unsigned int alloced:1;
};
/* \brief
* Allocates memory for an ast_bt and stores addresses and symbols.
*
* \return Returns NULL on failure, or the allocated ast_bt on success
* \since 1.6.1
*/
struct ast_bt *ast_bt_create(void);
/* \brief
* Fill an allocated ast_bt with addresses
*
* \retval 0 Success
* \retval -1 Failure
* \since 1.6.1
*/
int ast_bt_get_addresses(struct ast_bt *bt);
/* \brief
*
* Free dynamically allocated portions of an ast_bt
*
* \retval NULL.
* \since 1.6.1
*/
void *ast_bt_destroy(struct ast_bt *bt);
/* \brief Retrieve symbols for a set of backtrace addresses
*
* \param addresses A list of addresses, such as the ->addresses structure element of struct ast_bt.
* \param num_frames Number of addresses in the addresses list
* \retval NULL Unable to allocate memory
* \return List of strings
* \since 1.6.2.16
*/
char **ast_bt_get_symbols(void **addresses, size_t num_frames);
#endif /* HAVE_BKTR */
#endif /* _LOGGER_BACKTRACE_H */
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif