mirror of
https://github.com/MariaDB/server.git
synced 2025-01-16 12:02:42 +01:00
d5e928959e
The problem is that the logic which checks if a pointer is valid relies on a poor heuristic based on the start and end addresses of the data segment and heap. Apart from miscalculating the heap bounds, this approach also suffers from the fact that memory can come from places other than the heap. See Bug#58528 for a more detailed explanation. On Linux, the solution is to access the process's memory through /proc/self/task/<tid>/mem, which allows for retrieving the contents of pages within the virtual address space of the calling process. If a address range is not mapped, a input/output error is returned. client/mysqltest.cc: Use new interface to my_safe_print_str. include/my_stacktrace.h: Drop name from my_safe_print_str. mysys/stacktrace.c: Access the process's memory through a file descriptor and dump the contents of the memory range. The file descriptor offset is equivalent to a offset into the address space. Do not print the name of the variable associated with the address. It can be better accomplished at a higher level. sql/mysqld.cc: Put the variable dumping information within its own newline block. Use symbolic names which better convey information to the user.
66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
/* Copyright (C) 2000 MySQL AB
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; version 2 of the License.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
|
|
|
|
#ifndef _my_stacktrace_h_
|
|
#define _my_stacktrace_h_
|
|
|
|
#include <my_global.h>
|
|
|
|
#ifdef TARGET_OS_LINUX
|
|
#if defined (__x86_64__) || defined (__i386__) || \
|
|
(defined(__alpha__) && defined(__GNUC__))
|
|
#define HAVE_STACKTRACE 1
|
|
#endif
|
|
#elif defined(__WIN__) || defined(HAVE_PRINTSTACK)
|
|
#define HAVE_STACKTRACE 1
|
|
#endif
|
|
|
|
#if HAVE_BACKTRACE && (HAVE_BACKTRACE_SYMBOLS || HAVE_BACKTRACE_SYMBOLS_FD)
|
|
#undef HAVE_STACKTRACE
|
|
#define HAVE_STACKTRACE 1
|
|
#endif
|
|
|
|
#if !defined(__NETWARE__)
|
|
#define HAVE_WRITE_CORE
|
|
#endif
|
|
|
|
#if HAVE_BACKTRACE && HAVE_BACKTRACE_SYMBOLS && \
|
|
HAVE_CXXABI_H && HAVE_ABI_CXA_DEMANGLE && \
|
|
HAVE_WEAK_SYMBOL
|
|
#define BACKTRACE_DEMANGLE 1
|
|
#endif
|
|
|
|
C_MODE_START
|
|
|
|
#if defined(HAVE_STACKTRACE) || defined(HAVE_BACKTRACE)
|
|
void my_init_stacktrace();
|
|
void my_print_stacktrace(uchar* stack_bottom, ulong thread_stack);
|
|
void my_safe_print_str(const char* val, int max_len);
|
|
void my_write_core(int sig);
|
|
#if BACKTRACE_DEMANGLE
|
|
char *my_demangle(const char *mangled_name, int *status);
|
|
#endif
|
|
#ifdef __WIN__
|
|
void my_set_exception_pointers(EXCEPTION_POINTERS *ep);
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef HAVE_WRITE_CORE
|
|
void my_write_core(int sig);
|
|
#endif
|
|
|
|
C_MODE_END
|
|
|
|
#endif /* _my_stacktrace_h_ */
|