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https://github.com/jart/cosmopolitan.git
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f7ff77d865
- Invent iso8601us() for faster timestamps - Improve --strace descriptions of sigset_t - Rebuild the Landlock Make bootstrap binary - Introduce MODE=sysv for non-Windows builds - Permit OFD fcntl() locks under pledge(flock) - redbean can now protect your kernel from ddos - Have vfork() fallback to sys_fork() not fork() - Change kmalloc() to not die when out of memory - Improve documentation for some termios functions - Rewrite putenv() and friends to conform to POSIX - Fix linenoise + strace verbosity issue on Windows - Fix regressions in our ability to show backtraces - Change redbean SetHeader() to no-op if value is nil - Improve fcntl() so SQLite locks work in non-WAL mode - Remove some unnecessary work during fork() on Windows - Create redbean-based SSL reverse proxy for IPv4 TurfWar - Fix ape/apeinstall.sh warning when using non-bash shells - Add ProgramTrustedIp(), and IsTrustedIp() APIs to redbean - Support $PWD, $UID, $GID, and $EUID in command interpreter - Introduce experimental JTqFpD APE prefix for non-Windows builds - Invent blackhole daemon for firewalling IP addresses via UNIX named socket - Add ProgramTokenBucket(), AcquireToken(), and CountTokens() APIs to redbean
81 lines
3.2 KiB
C
81 lines
3.2 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/dce.h"
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#include "libc/intrin/bits.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/log/log.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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/**
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* ASAN heap memory safety crash example.
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*
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* make -j8 MODE=dbg o/dbg/examples/auto-memory-safety-crash2.com
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* o/dbg/examples/auto-memory-safety-crash2.com
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*
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* You should see:
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*
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* heap overrun 1-byte store at 0x10008004002d shadow 0x20090000005
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* ./o/dbg/examples/auto-memory-safety-crash2.com
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* x
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* OOOOOOOOOOOUUUUUUUUUUUUUUUU.............OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
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* |-7 |-6 |-6 |0 |5 |-7 |-7 |-7 |-7
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* »!@ ÿ▄:Y╩≥= S hello ∙∙∙∙∙∙∙ ♪ GT◘&@ á+@ »!@
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* 000000400000-00000042b000 .text
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* 00000042b000-00000042d000 .data
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* 00007fff0000-00008000ffff
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* 000080070000-00008008ffff
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* 02008fff0000-02009000ffff ←shadow
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* 0e007fff0000-0e008000ffff
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* 10003ab90000-10003abaffff
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* 100080000000-10008000ffff ←address
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* 6ffffffe0000-6fffffffffff
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*
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* the memory was allocated by
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* 0x100080040020 64 bytes [dlmalloc]
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* 0x100080040030 13 bytes [actual]
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* 402608 main
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* 402ba0 cosmo
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* 4021af _start
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*
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* the crash was caused by
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* 0x0000000000404793: __die at libc/log/die.c:40
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* 0x0000000000404f56: __asan_report_store at libc/intrin/asan.c:1183
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* 0x0000000000402579: main at examples/auto-memory-safety-crash2.c:30
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* 0x000000000040270f: 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 U, O, 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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int main(int argc, char *argv[]) {
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if (!IsAsan()) {
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kprintf("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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kprintf("----------------\n");
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kprintf(" THIS IS A TEST \n");
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kprintf("SIMULATING CRASH\n");
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kprintf("----------------\n");
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char *buffer;
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ShowCrashReports(); /* not needed but yoinks appropriate symbols */
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buffer = malloc(13);
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strcpy(buffer, "hello");
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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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asm("" : "+r"(buffer)); /* prevent compiler being smart */
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return 0;
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}
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