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runtime: impose stack size limit

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The goal is to stop only those programs that would keep
going and run the machine out of memory, but before they do that.
1 GB on 64-bit, 250 MB on 32-bit.
That seems implausibly large, and it can be adjusted.

Fixes #2556.
Fixes #4494.
Fixes #5173.

R=khr, r, dvyukov
CC=golang-dev
https://golang.org/cl/12541052
This commit is contained in:
Russ Cox 2013-08-15 22:34:06 -04:00
parent 205329aaf2
commit 757e0de89f
6 changed files with 80 additions and 11 deletions
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19
src/pkg/runtime/stack.c
View file

@ -176,13 +176,17 @@ runtime·oldstack(void)
gp->stackguard = top->stackguard;
gp->stackguard0 = gp->stackguard;
if(top->free != 0)
if(top->free != 0) {
gp->stacksize -= top->free;
runtime·stackfree(old, top->free);
}
gp->status = oldstatus;
runtime·gogo(&gp->sched);
}
uintptr runtime·maxstacksize = 1<<20; // enough until runtime.main sets it for real
// Called from runtime·newstackcall or from runtime·morestack when a new
// stack segment is needed. Allocate a new stack big enough for
// m->moreframesize bytes, copy m->moreargsize bytes to the new frame,
@ -285,6 +289,11 @@ runtime·newstack(void)
if(framesize < StackMin)
framesize = StackMin;
framesize += StackSystem;
gp->stacksize += framesize;
if(gp->stacksize > runtime·maxstacksize) {
runtime·printf("runtime: goroutine stack exceeds %D-byte limit\n", (uint64)runtime·maxstacksize);
runtime·throw("stack overflow");
}
stk = runtime·stackalloc(framesize);
top = (Stktop*)(stk+framesize-sizeof(*top));
free = framesize;
@ -353,3 +362,11 @@ runtime·gostartcallfn(Gobuf *gobuf, FuncVal *fv)
{
runtime·gostartcall(gobuf, fv->fn, fv);
}
void
runtime∕debug·setMaxStack(intgo in, intgo out)
{
out = runtime·maxstacksize;
runtime·maxstacksize = in;
FLUSH(&out);
}