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Improve memory safety
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.
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317 changed files with 6474 additions and 3993 deletions
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@ -225,6 +225,7 @@ syscon mmap MAP_SHARED 1 1 1 1 1 1 # forced consensus & faked nt
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syscon mmap MAP_PRIVATE 2 2 2 2 2 2 # forced consensus & faked nt
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syscon mmap MAP_TYPE 15 15 15 15 15 15 # mask for type of mapping
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syscon mmap MAP_FIXED 0x10 0x10 0x10 0x10 0x10 0x10 # unix consensus; openbsd appears to forbid; faked nt
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syscon mmap MAP_FIXED_NOREPLACE 0x8000000 0x8000000 0x8000000 0x8000000 0x8000000 0x8000000 # handled and defined by cosmo runtime; 0x100000 on linux 4.7+
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syscon mmap MAP_ANONYMOUS 0x20 0x1000 0x1000 0x1000 0x1000 0x20 # bsd consensus; faked nt
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syscon mmap MAP_GROWSDOWN 0x0100 0 0x0400 0x4000 0x4000 0x100000 # mandatory for OpenBSD stacks; MAP_STACK on Free/OpenBSD; MEM_TOP_DOWN on NT
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syscon mmap MAP_CONCEAL 0 0 0x20000 0x8000 0x8000 0 # omit from core dumps; MAP_NOCORE on FreeBSD
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@ -506,7 +507,7 @@ syscon rlimit RLIMIT_RSS 5 5 5 5 5 127 # max physical memory size
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syscon rlimit RLIMIT_NPROC 6 7 7 7 7 127 # max number of processes; see fork()→EAGAIN; bsd consensus
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syscon rlimit RLIMIT_NOFILE 7 8 8 8 8 127 # max number of open files; see accept()→EMFILE/ENFILE; bsd consensus
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syscon rlimit RLIMIT_MEMLOCK 8 6 6 6 6 127 # max locked-in-memory address space; bsd consensus
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syscon rlimit RLIMIT_AS 9 5 10 127 10 127 # max virtual memory size in bytes
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syscon rlimit RLIMIT_AS 9 5 10 127 10 127 # max virtual memory size in bytes; this one actually works; we set this to RLIMIT_DATA on OpenBSD
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syscon rlimit RLIMIT_LOCKS 10 127 127 127 127 127 # max flock() / fcntl() locks; bsd consensus
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syscon rlimit RLIMIT_SIGPENDING 11 127 127 127 127 127 # max sigqueue() can enqueue; bsd consensus
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syscon rlimit RLIMIT_MSGQUEUE 12 127 127 127 127 127 # meh posix message queues; bsd consensus
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@ -592,10 +593,12 @@ syscon sicode POLL_ERR 4 4 4 4 4 4 # SIGIO; i/o error; unix conse
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syscon sicode POLL_PRI 5 5 5 5 5 5 # SIGIO; high priority input available; unix consensus
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syscon sicode POLL_HUP 6 6 6 6 6 6 # SIGIO; device disconnected; unix consensus
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# sigalstack() values
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# sigaltstack() values
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#
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# group name GNU/Systemd XNU's Not UNIX! FreeBSD OpenBSD NetBSD The New Technology Commentary
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syscon ss SIGSTKSZ 0x2000 0x020000 0x8800 0x7000 0x7000 0x2000
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syscon ss SS_ONSTACK 1 1 1 1 1 1 # unix consensus
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syscon ss SS_DISABLE 2 4 4 4 4 2 # bsd consensus
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# clock_{gettime,settime} timers
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#
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@ -1898,9 +1901,6 @@ syscon misc MT_ST_CAN_PARTITIONS 0x0400 0 0 0 0 0
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syscon misc MT_ST_HPLOADER_OFFSET 0x2710 0 0 0 0 0
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syscon misc MT_ST_SCSI2LOGICAL 0x0800 0 0 0 0 0
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syscon misc SS_ONSTACK 1 1 1 1 1 0 # unix consensus
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syscon misc SS_DISABLE 2 4 4 4 4 0 # bsd consensus
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syscon misc SYNC_FILE_RANGE_WAIT_AFTER 4 0 0 0 0 0
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syscon misc SYNC_FILE_RANGE_WAIT_BEFORE 1 0 0 0 0 0
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syscon misc SYNC_FILE_RANGE_WRITE 2 0 0 0 0 0
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