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eval_intern.h: jmpbuf must be accessible

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* eval_intern.h (TH_PUSH_TAG): ensure jmpbuf to be accessible before
  pushing tag to get rid of unaccessible tag by stack overflow.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40791 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2013-05-17 02:07:00 +00:00
parent de03518cc7
commit f7624d984b
2 changed files with 16 additions and 0 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
Fri May 17 11:06:48 2013 Nobuyoshi Nakada <nobu@ruby-lang.org>
* eval_intern.h (TH_PUSH_TAG): ensure jmpbuf to be accessible before
pushing tag to get rid of unaccessible tag by stack overflow.
Thu May 16 17:15:32 2013 NARUSE, Yui <naruse@ruby-lang.org>
* vm_eval.c (rb_catch_obj): add volatile to tag to prevent crash

11
eval_intern.h
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@ -91,9 +91,20 @@ extern int select_large_fdset(int, fd_set *, fd_set *, fd_set *, struct timeval
rb_fiber_start(); \
} while (0)
/*
ensure tag to be accessible, `buf' is at the beginning.
the end is `prev' which is written in TH_PUSH_TAG().
*/
#if defined(__GNUC__) && __GNUC__ >= 4
/* suppress -Wstrict-aliasing, and should be inlined */
# define ENSURE_TAG_WRITABLE(tag) MEMZERO((tag).buf, int, 1)
#else
# define ENSURE_TAG_WRITABLE(tag) (*(volatile int *)(tag).buf = 0)
#endif
#define TH_PUSH_TAG(th) do { \
rb_thread_t * const _th = (th); \
struct rb_vm_tag _tag; \
ENSURE_TAG_WRITABLE(_tag); \
_tag.tag = 0; \
_tag.prev = _th->tag; \
_th->tag = &_tag;