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Workaround MAP_GROWSDOWN unavailability on WSL

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Justine Tunney 2022-11-02 01:38:06 -07:00
parent bd6069deb5
commit fc96af058b
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GPG key ID: BE714B4575D6E328
4 changed files with 62 additions and 47 deletions
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18
libc/runtime/mmap.c
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@ -380,16 +380,20 @@ static noasan inline void *Mmap(void *addr, size_t size, int prot, int flags,
// with 4kb guards like a sane multithreaded production system.
// however this 1mb behavior oddly enough is smart enough to not
// apply if the mapping is a manually-created guard page.
int e = errno;
if ((dm = sys_mmap(p + size - PAGESIZE, PAGESIZE, prot,
f | MAP_GROWSDOWN_linux, fd, off))
.addr == MAP_FAILED) {
return MAP_FAILED;
.addr != MAP_FAILED) {
_npassert(sys_mmap(p, PAGESIZE, PROT_NONE,
MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0)
.addr == p);
dm.addr = p;
return FinishMemory(p, size, prot, flags, fd, off, f, x, n, dm);
} else if (errno == ENOTSUP) {
// WSL doesn't support MAP_GROWSDOWN
needguard = true;
errno = e;
}
_npassert(sys_mmap(p, PAGESIZE, PROT_NONE,
MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0)
.addr == p);
dm.addr = p;
return FinishMemory(p, size, prot, flags, fd, off, f, x, n, dm);
} else {
if (IsFreebsd()) {
f |= MAP_STACK_freebsd;

2
libc/sysv/consts.sh
View file

@ -77,7 +77,7 @@ syscon errno EPROTOTYPE 91 41 41 41 41 10041 # protocol wrong typ
syscon errno ENOPROTOOPT 92 42 42 42 42 10042 # protocol not available; bsd consensus; WSAENOPROTOOPT; raised by getsockopt(2), accept(2), ip(7)
syscon errno EPROTONOSUPPORT 93 43 43 43 43 10043 # protocol not supported; bsd consensus; WSAEPROTONOSUPPORT; raised by socket(2), socketpair(2), unix(7)
syscon errno ESOCKTNOSUPPORT 94 44 44 44 44 10044 # socket type not supported; bsd consensus; WSAESOCKTNOSUPPORT; raised by unix(7), ip(7)
syscon errno ENOTSUP 95 45 45 91 86 10045 # operation not supported; raised by chmod(2), clock_getres(2), clock_nanosleep(2), getxattr(2), listxattr(2), removexattr(2), setxattr(2), timer_create(2)
syscon errno ENOTSUP 95 45 45 91 86 10045 # operation not supported; raised by chmod(2), clock_getres(2), clock_nanosleep(2), getxattr(2), listxattr(2), removexattr(2), setxattr(2), timer_create(2), mmap(2)
syscon errno EOPNOTSUPP 95 102 45 45 45 10045 # socket operation not supported; raised by accept(2), fallocate(2), fanotify_mark(2), ioctl_ficlonerange(2), ioctl_fideduperange(2), ioctl_getfsmap(2), keyctl(2), listen(2), mmap(2), open_by_handle_at(2), pciconfig_read(2), perf_event_open(2), prctl(2), readv(2), s390_guarded_storage(2), s390_runtime_instr(2), s390_sthyi(2), send(2), socketpair(2), unix(7), ip(7)
syscon errno EPFNOSUPPORT 96 46 46 46 46 10046 # protocol family not supported; bsd consensus; WSAEPFNOSUPPORT
syscon errno EAFNOSUPPORT 97 47 47 47 47 10047 # address family not supported; bsd consensus; WSAEAFNOSUPPORT; raised by connect(2), socket(2), socketpair(2), tcp(7)