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Make C memory safe like Rust

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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.
This commit is contained in:
Justine Tunney 2021-02-01 03:33:13 -08:00
parent fdc3fa9148
commit 1ff9ab95ac
153 changed files with 2545 additions and 2077 deletions
Download patch file Download diff file Expand all files Collapse all files

16
third_party/chibicc/as.c vendored
View file

@ -522,6 +522,7 @@ static int AppendSection(struct As *a, int name, int flags, int type) {
int i;
APPEND(a->sections);
i = a->sections.n - 1;
CHECK_LT(i, SHN_LORESERVE);
a->sections.p[i].name = name;
a->sections.p[i].flags = flags;
a->sections.p[i].type = type;
@ -1805,6 +1806,15 @@ static void OnSize(struct As *a, struct Slice s) {
a->symbols.p[i].size = GetInt(a);
}
static void OnComm(struct As *a, struct Slice s) {
int i;
i = GetSymbol(a, a->things.p[a->i++].i);
ConsumeComma(a);
a->symbols.p[i].size = GetInt(a);
a->symbols.p[i].type = STT_COMMON;
a->symbols.p[i].section = SHN_COMMON;
}
static void OpVisibility(struct As *a, int visibility) {
int i;
for (;;) {
@ -3118,6 +3128,7 @@ static const struct Directive8 {
{".balign", OnAlign}, //
{".bss", OnBss}, //
{".byte", OnByte}, //
{".comm", OnComm}, //
{".data", OnData}, //
{".double", OnDouble}, //
{".err", OnErr}, //
@ -3280,8 +3291,8 @@ static const struct Directive8 {
{"fildll", OnFildll}, //
{"fildq", OnFildq}, //
{"filds", OnFilds}, //
{"fistpq", OnFistpq}, //
{"fistpll", OnFistpq}, //
{"fistpq", OnFistpq}, //
{"fisttpll", OnFisttpq}, //
{"fisttpq", OnFisttpq}, //
{"fisttps", OnFisttps}, //
@ -3906,6 +3917,9 @@ static void Objectify(struct As *a, int path) {
a->symbols.p[i].ref = elfwriter_appendsym(
elf, p, ELF64_ST_INFO(a->symbols.p[i].stb, a->symbols.p[i].type),
a->symbols.p[i].stv, a->symbols.p[i].offset, a->symbols.p[i].size);
if (a->symbols.p[i].section >= SHN_LORESERVE) {
elfwriter_setsection(elf, a->symbols.p[i].ref, a->symbols.p[i].section);
}
free(p);
}
for (i = 0; i < a->sections.n; ++i) {