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Improve memory safety

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This commit makes numerous refinements to cosmopolitan memory handling.

The default stack size has been reduced from 2mb to 128kb. A new macro
is now provided so you can easily reconfigure the stack size to be any
value you want. Work around the breaking change by adding to your main:

    STATIC_STACK_SIZE(0x00200000);  // 2mb stack

If you're not sure how much stack you need, then you can use:

    STATIC_YOINK("stack_usage_logging");

After which you can `sort -nr o/$MODE/stack.log`. Based on the unit test
suite, nothing in the Cosmopolitan repository (except for Python) needs
a stack size greater than 30kb. There are also new macros for detecting
the size and address of the stack at runtime, e.g. GetStackAddr(). We
also now support sigaltstack() so if you want to see nice looking crash
reports whenever a stack overflow happens, you can put this in main():

    ShowCrashReports();

Under `make MODE=dbg` and `make MODE=asan` the unit testing framework
will now automatically print backtraces of memory allocations when
things like memory leaks happen. Bugs are now fixed in ASAN global
variable overrun detection. The memtrack and asan runtimes also handle
edge cases now. The new tools helped to identify a few memory leaks,
which are fixed by this change.

This change should fix an issue reported in #288 with ARG_MAX limits.
Fixing this doubled the performance of MKDEPS.COM and AR.COM yet again.
This commit is contained in:
Justine Tunney 2021-10-13 17:27:13 -07:00
parent a0b39f886c
commit 226aaf3547
317 changed files with 6474 additions and 3993 deletions
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12
libc/runtime/runtime.h
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@ -8,14 +8,15 @@ COSMOPOLITAN_C_START_
typedef long jmp_buf[8] forcealign(CACHELINE);
extern int __argc; /* CRT */
extern char **__argv; /* CRT */
extern char **environ; /* CRT */
extern unsigned long *__auxv; /* CRT */
extern const int __argc; /* CRT */
extern char **const __argv; /* CRT */
extern char **const __envp; /* CRT */
extern unsigned long *const __auxv; /* CRT */
extern char program_executable_name[]; /* RII */
extern char *program_invocation_name; /* RII */
extern char *program_invocation_short_name; /* RII */
extern int ftrace; /* CRT */
extern int g_ftrace; /* CRT */
extern uint64_t g_syscount; /* RII */
extern const uint64_t kStartTsc; /* RII */
extern const char kTmpPath[]; /* RII */
@ -46,6 +47,7 @@ void _longjmp(jmp_buf, int) libcesque wontreturn paramsnonnull();
void exit(int) wontreturn;
void _exit(int) libcesque wontreturn;
void _Exit(int) libcesque wontreturn;
void quick_exit(int) wontreturn;
void abort(void) wontreturn noinstrument;
int __cxa_atexit(void *, void *, void *) libcesque;
int atfork(void *, void *) libcesque;
@ -81,7 +83,7 @@ int acct(const char *);
void longsort(long *, size_t);
bool _isheap(void *);
int NtGetVersion(void);
int NtGetVersion(void) pureconst;
long missingno();
void __oom_hook(size_t);
void __print(const void *, size_t);