mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
62 lines
2.7 KiB
C
62 lines
2.7 KiB
C
#if 0
|
||
/*─────────────────────────────────────────────────────────────────╗
|
||
│ To the extent possible under law, Justine Tunney has waived │
|
||
│ all copyright and related or neighboring rights to this file, │
|
||
│ as it is written in the following disclaimers: │
|
||
│ • http://unlicense.org/ │
|
||
│ • http://creativecommons.org/publicdomain/zero/1.0/ │
|
||
╚─────────────────────────────────────────────────────────────────*/
|
||
#endif
|
||
#include "libc/intrin/bits.h"
|
||
#include "libc/dce.h"
|
||
#include "libc/log/log.h"
|
||
#include "libc/runtime/runtime.h"
|
||
#include "libc/stdio/stdio.h"
|
||
|
||
/**
|
||
* ASAN static memory safety crash example.
|
||
*
|
||
* make -j8 MODE=dbg o/dbg/examples/auto-memory-safety-crash.com
|
||
* o/dbg/examples/auto-memory-safety-crash.com
|
||
*
|
||
* You should see:
|
||
*
|
||
* global redzone 1-byte store at 0x42700d shadow 0x8007ce01
|
||
* ./o/dbg/examples/auto-memory-safety-crash.com
|
||
* x
|
||
* ........................................GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
|
||
* |0 |0 |0 |0 |5 |-18 |-18 |-18 |-18
|
||
* f.☼▼ä f.☼▼ä f☼▼D hello
|
||
* 000000400000-000000427000 .text
|
||
* 000000427000-000000429000 .data ←address
|
||
* 00007fff0000-00008000ffff
|
||
* 000080070000-00008008ffff ←shadow
|
||
* 0e007fff0000-0e008000ffff
|
||
* 100047d20000-100047d3ffff
|
||
* 6ffffffe0000-6fffffffffff
|
||
* the memory in question belongs to the symbols
|
||
* buffer [0x427000,0x42700c] size 13
|
||
* the crash was caused by
|
||
* 0x00000000004046f3: __die at libc/log/die.c:40
|
||
* 0x0000000000404aed: __asan_report_store at libc/intrin/asan.c:1183
|
||
* 0x0000000000402552: main at examples/auto-memory-safety-crash.c:27
|
||
* 0x000000000040268d: cosmo at libc/runtime/cosmo.S:64
|
||
* 0x00000000004021ae: _start at libc/crt/crt.S:77
|
||
*
|
||
* @see libc/intrin/asancodes.h for meaning of G, etc. and negative numbers
|
||
* @see libc/nexgen32e/kcp437.S for meaning of symbols
|
||
*/
|
||
|
||
char buffer[13] = "hello";
|
||
|
||
int main(int argc, char *argv[]) {
|
||
if (!IsAsan()) {
|
||
printf("this example is intended for MODE=asan or MODE=dbg\n");
|
||
exit(1);
|
||
}
|
||
ShowCrashReports(); /* not needed but yoinks appropriate symbols */
|
||
int i = 13;
|
||
asm("" : "+r"(i)); /* prevent compiler being smart */
|
||
buffer[i] = 1;
|
||
return 0;
|
||
}
|