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Fix memory corruption when trying to get "core show locks".

Browse Source 
Review https://reviewboard.asterisk.org/r/2580/ tried to fix the mismatch
in memory pools but had a math error determining the buffer size and
didn't address other similar memory pool mismatches.

* Effectively reverted the previous patch to go in the same direction as
trunk for the returned memory pool of ast_bt_get_symbols().

* Fixed memory leak in ast_bt_get_symbols() when BETTER_BACKTRACES is
defined.

* Fixed some formatting in ast_bt_get_symbols().

* Fixed sig_pri.c freeing memory allocated by libpri when MALLOC_DEBUG is
enabled.

* Fixed __dump_backtrace() freeing memory from ast_bt_get_symbols() when
MALLOC_DEBUG is enabled.

* Moved __dump_backtrace() because of compile issues with the utils
directory.

(closes issue ASTERISK-22221)
Reported by: Matt Jordan

Review: https://reviewboard.asterisk.org/r/2778/
........

Merged revisions 397525 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 397528 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@397570 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Richard Mudgett
2013-08-23 18:07:40 +00:00
parent 32a0567c46
commit 46b9e5450f
11 changed files with 97 additions and 72 deletions
Download Patch File Download Diff File Expand all files Collapse all files

67
main/backtrace.c
View File

@@ -40,17 +40,10 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$");
#include <bfd.h>
#endif
/* Undefine the overrides for memory allocation. astmm.c uses these functions
* as well.
*/
#undef calloc
#undef malloc
#undef free
#undef realloc
struct ast_bt *__ast_bt_create(void)
{
struct ast_bt *bt = calloc(1, sizeof(*bt));
struct ast_bt *bt = ast_std_calloc(1, sizeof(*bt));
if (!bt) {
return NULL;
}
@@ -69,15 +62,15 @@ int __ast_bt_get_addresses(struct ast_bt *bt)
void *__ast_bt_destroy(struct ast_bt *bt)
{
if (bt->alloced) {
free(bt);
if (bt && bt->alloced) {
ast_std_free(bt);
}
return NULL;
}
char **__ast_bt_get_symbols(void **addresses, size_t num_frames)
{
char **strings = NULL;
char **strings;
#if defined(BETTER_BACKTRACES)
int stackfr;
bfd *bfdobj; /* bfd.h */
@@ -97,9 +90,12 @@ char **__ast_bt_get_symbols(void **addresses, size_t num_frames)
#if defined(BETTER_BACKTRACES)
strings_size = num_frames * sizeof(*strings);
eachlen = calloc(num_frames, sizeof(*eachlen));
if (!(strings = calloc(num_frames, sizeof(*strings)))) {
eachlen = ast_std_calloc(num_frames, sizeof(*eachlen));
strings = ast_std_calloc(num_frames, sizeof(*strings));
if (!eachlen || !strings) {
ast_std_free(eachlen);
ast_std_free(strings);
return NULL;
}
@@ -114,6 +110,7 @@ char **__ast_bt_get_symbols(void **addresses, size_t num_frames)
if (strcmp(dli.dli_fname, "asterisk") == 0) {
char asteriskpath[256];
if (!(dli.dli_fname = ast_utils_which("asterisk", asteriskpath, sizeof(asteriskpath)))) {
/* This will fail to find symbols */
dli.dli_fname = "asterisk";
@@ -121,22 +118,22 @@ char **__ast_bt_get_symbols(void **addresses, size_t num_frames)
}
lastslash = strrchr(dli.dli_fname, '/');
if ( (bfdobj = bfd_openr(dli.dli_fname, NULL)) &&
bfd_check_format(bfdobj, bfd_object) &&
(allocsize = bfd_get_symtab_upper_bound(bfdobj)) > 0 &&
(syms = malloc(allocsize)) &&
(symbolcount = bfd_canonicalize_symtab(bfdobj, syms))) {
if ((bfdobj = bfd_openr(dli.dli_fname, NULL)) &&
bfd_check_format(bfdobj, bfd_object) &&
(allocsize = bfd_get_symtab_upper_bound(bfdobj)) > 0 &&
(syms = ast_std_malloc(allocsize)) &&
(symbolcount = bfd_canonicalize_symtab(bfdobj, syms))) {
if (bfdobj->flags & DYNAMIC) {
offset = addresses[stackfr] - dli.dli_fbase;
} else {
offset = addresses[stackfr] - (void *)0;
offset = addresses[stackfr] - (void *) 0;
}
for (section = bfdobj->sections; section; section = section->next) {
if ( !bfd_get_section_flags(bfdobj, section) & SEC_ALLOC ||
section->vma > offset ||
section->size + section->vma < offset) {
if (!bfd_get_section_flags(bfdobj, section) & SEC_ALLOC ||
section->vma > offset ||
section->size + section->vma < offset) {
continue;
}
@@ -151,7 +148,9 @@ char **__ast_bt_get_symbols(void **addresses, size_t num_frames)
found++;
if ((lastslash = strrchr(file, '/'))) {
const char *prevslash;
for (prevslash = lastslash - 1; *prevslash != '/' && prevslash >= file; prevslash--);
for (prevslash = lastslash - 1; *prevslash != '/' && prevslash >= file; prevslash--) {
}
if (prevslash >= file) {
lastslash = prevslash;
}
@@ -173,7 +172,7 @@ char **__ast_bt_get_symbols(void **addresses, size_t num_frames)
}
if (bfdobj) {
bfd_close(bfdobj);
free(syms);
ast_std_free(syms);
}
/* Default output, if we cannot find the information within BFD */
@@ -193,27 +192,31 @@ char **__ast_bt_get_symbols(void **addresses, size_t num_frames)
if (!ast_strlen_zero(msg)) {
char **tmp;
eachlen[stackfr] = strlen(msg);
if (!(tmp = realloc(strings, strings_size + eachlen[stackfr] + 1))) {
free(strings);
eachlen[stackfr] = strlen(msg) + 1;
if (!(tmp = ast_std_realloc(strings, strings_size + eachlen[stackfr]))) {
ast_std_free(strings);
strings = NULL;
break; /* out of stack frame iteration */
}
strings = tmp;
strings[stackfr] = (char *) strings + strings_size;
ast_copy_string(strings[stackfr], msg, eachlen[stackfr] + 1);
strings_size += eachlen[stackfr] + 1;
strcpy(strings[stackfr], msg);/* Safe since we just allocated the room. */
strings_size += eachlen[stackfr];
}
}
if (strings) {
/* Recalculate the offset pointers */
/* Recalculate the offset pointers because of the reallocs. */
strings[0] = (char *) strings + num_frames * sizeof(*strings);
for (stackfr = 1; stackfr < num_frames; stackfr++) {
strings[stackfr] = strings[stackfr - 1] + eachlen[stackfr - 1] + 1;
strings[stackfr] = strings[stackfr - 1] + eachlen[stackfr - 1];
}
}
ast_std_free(eachlen);
#else /* !defined(BETTER_BACKTRACES) */
strings = backtrace_symbols(addresses, num_frames);
#endif /* defined(BETTER_BACKTRACES) */
return strings;