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merge revision(s) 54256: [Backport #12118]

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* thread_pthread.c (reserve_stack): fix reserving position where
	  the stack growing bottom to top. [Bug #12118]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@54430 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nagachika 2016-03-29 21:19:35 +00:00
parent 3f7ce08537
commit 2725eed1dc
3 changed files with 26 additions and 7 deletions
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26
thread_pthread.c
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@ -680,17 +680,31 @@ reserve_stack(volatile char *limit, size_t size)
const volatile char *end = buf + sizeof(buf);
limit += size;
if (limit > end) {
size = limit - end;
limit = alloca(size);
limit[stack_check_margin+size-1] = 0;
/* |<-bottom (=limit(a)) top->|
* | .. |<-buf 256B |<-end | stack check |
* | 256B | =size= | margin (4KB)|
* | =size= limit(b)->| 256B | |
* | | alloca(sz) | | |
* | .. |<-buf |<-limit(c) [sz-1]->0> | |
*/
size_t sz = limit - end;
limit = alloca(sz);
limit[sz-1] = 0;
}
}
else {
limit -= size;
if (buf > limit) {
limit = alloca(buf - limit);
limit[0] = 0; /* ensure alloca is called */
limit -= stack_check_margin;
/* |<-top (=limit(a)) bottom->|
* | .. | 256B buf->| | stack check |
* | 256B | =size= | margin (4KB)|
* | =size= limit(b)->| 256B | |
* | | alloca(sz) | | |
* | .. | buf->| limit(c)-><0> | |
*/
size_t sz = buf - limit;
limit = alloca(sz);
limit[0] = 0;
}
}
}