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