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1ff9ab95ac
This change enables Address Sanitizer systemically w/ `make MODE=dbg`. Our version of Rust's `unsafe` keyword is named `noasan` which is used for two functions that do aligned memory chunking, like `strcpy.c` and we need to fix the tiny DEFLATE code, but that's it everything else is fabulous you can have all the fischer price security blankets you need Best of all is we're now able to use the ASAN data in Blinkenlights to colorize the memory dumps. See the screenshot below of a test program: https://justine.lol/blinkenlights/asan.png Which is operating on float arrays stored on the stack, with red areas indicating poisoned memory, and the green areas indicate valid memory.
94 lines
3.7 KiB
C
94 lines
3.7 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/bits/pushpop.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/ucontext.h"
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#include "libc/log/log.h"
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#include "libc/math.h"
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#include "libc/nt/enum/errormodeflags.h"
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#include "libc/nt/signals.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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* @fileoverview Demonstrates SEGFAULT via NULL pointer dereference.
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*
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* In MODE=dbg mode, UBSAN should catch this and display a backtrace.
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* In most other modes, e.g. MODE=balanced, the oncrash.c sig handler
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* will either launch GDB or display a very fancy report.
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*
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* make -j8 -O MODE=opt o/opt/examples/crashreportdemo.com
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* o/opt/examples/crashreportdemo.com
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*
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* To prevent the GDB GUI from popping up:
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*
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* export GDB=""
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* make -j8 -O MODE=opt o/opt/examples/crashreportdemo.com
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* o/opt/examples/crashreportdemo.com
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*/
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int boo;
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void boop(void);
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int main(int argc, char *argv[]) {
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int64_t res;
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showcrashreports();
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res = 0;
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asm volatile("mov\t$0x1111111111111111,%rax\n\t"
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"mov\t$0x3333333333333333,%rcx\n\t"
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"mov\t$0x4444444444444444,%rdx\n\t"
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"mov\t$0x8888888888888888,%r8\n\t"
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"mov\t$0x9999999999999999,%r9d\n\t"
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"mov\t$0xaaaaaaaaaaaaaaaa,%r10d\n\t"
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"mov\t$0xbbbbbbbbbbbbbbbb,%r11d\n\t"
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"mov\t$0x0000000000000000,%rax\n\t"
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"movd\t%rax,%xmm0\n\t"
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"mov\t$0x1111111111111111,%rax\n\t"
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"push\t%rax\n\t"
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"push\t%rax\n\t"
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"movdqu\t(%rsp),%xmm1\n\t"
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"pop\t%rax\n\t"
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"pop\t%rax\n\t"
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"mov\t$0x2222222222220022,%rax\n\t"
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"movd\t%rax,%xmm2\n\t"
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"mov\t$0x3333333333333333,%rax\n\t"
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"movd\t%rax,%xmm3\n\t"
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"mov\t$0x4444444444444444,%rax\n\t"
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"movd\t%rax,%xmm4\n\t"
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"mov\t$0x5555555555555555,%rax\n\t"
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"movd\t%rax,%xmm5\n\t"
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"mov\t$0x6666666666666666,%rax\n\t"
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"movd\t%rax,%xmm6\n\t"
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"mov\t$0x7777777777777777,%rax\n\t"
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"movd\t%rax,%xmm7\n\t"
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"mov\t$0x8888888888888888,%rax\n\t"
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"movd\t%rax,%xmm8\n\t"
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"mov\t$0x9999999999999999,%rax\n\t"
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"movd\t%rax,%xmm9\n\t"
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"mov\t$0xaaaaaaaaaaaaaaaa,%rax\n\t"
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"movd\t%rax,%xmm10\n\t"
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"mov\t$0xbbbbbbbbbbbbbbbb,%rax\n\t"
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"movd\t%rax,%xmm11\n\t"
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"mov\t$0xcccccccccccccccc,%rax\n\t"
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"movd\t%rax,%xmm12\n\t"
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"mov\t$0xdddddddddddddddd,%rax\n\t"
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"movd\t%rax,%xmm13\n\t"
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"mov\t$0xeeeeeeeeeeeeeeee,%rax\n\t"
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"movd\t%rax,%xmm14\n\t"
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"mov\t$0xffffffffffffffff,%rax\n\t"
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"movd\t%rax,%xmm15\n\t"
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"fldpi\n\t"
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"xor\t%eax,%eax\n\t"
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"div\t%eax\n\t");
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return res;
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}
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