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Make fixes and improvements

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- Document more compiler flags
- Expose new __print_maps() api
- Better overflow checking in mmap()
- Improve the shell example somewhat
- Fix minor runtime bugs regarding stacks
- Make kill() on fork()+execve()'d children work
- Support CLONE_CHILD_CLEARTID for proper joining
- Fix recent possible deadlock regression with --ftrace
This commit is contained in:
Justine Tunney 2022-05-19 16:57:49 -07:00
parent 6e52cba37a
commit ec2cb88058
68 changed files with 1211 additions and 431 deletions
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22
libc/intrin/asan.c
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@ -59,9 +59,21 @@
STATIC_YOINK("_init_asan");
#if IsModeDbg()
// MODE=dbg
// O(32mb) of morgue memory
// Θ(64) bytes of malloc overhead
#define ASAN_MORGUE_ITEMS 512
#define ASAN_MORGUE_THRESHOLD 65536 // morgue memory O(ITEMS*THRESHOLD)
#define ASAN_TRACE_ITEMS 16 // backtrace limit on malloc origin
#define ASAN_MORGUE_THRESHOLD 65536
#define ASAN_TRACE_ITEMS 16
#else
// MODE=asan
// O(32mb) of morgue memory
// Θ(32) bytes of malloc overhead
#define ASAN_MORGUE_ITEMS 512
#define ASAN_MORGUE_THRESHOLD 65536
#define ASAN_TRACE_ITEMS 4
#endif
/**
* @fileoverview Cosmopolitan Address Sanitizer Runtime.
@ -853,7 +865,7 @@ static void __asan_morgue_flush(void) {
void *p;
_spinlock_cooperative(&__asan_lock);
for (i = 0; i < ARRAYLEN(__asan_morgue.p); ++i) {
if (weaken(dlfree)) {
if (__asan_morgue.p[i] && weaken(dlfree)) {
weaken(dlfree)(__asan_morgue.p[i]);
}
__asan_morgue.p[i] = 0;
@ -1196,9 +1208,9 @@ void __asan_evil(uint8_t *addr, int size, const char *s1, const char *s2) {
struct AsanTrace tr;
__asan_rawtrace(&tr, __builtin_frame_address(0));
kprintf(
"WARNING: ASAN %s %s bad %d byte %s at %x bt %x %x %x %x %x\n",
"WARNING: ASAN %s %s bad %d byte %s at %x bt %x %x %x\n",
__asan_noreentry == gettid() ? "error during" : "multi-threaded crash",
s1, size, s2, addr, tr.p[0], tr.p[1], tr.p[2], tr.p[3], tr.p[4], tr.p[5]);
s1, size, s2, addr, tr.p[0], tr.p[1], tr.p[2], tr.p[3]);
}
void __asan_report_load(uint8_t *addr, int size) {