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add new instruction attribute called leaf

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An instruction is leaf if it has no rb_funcall inside.  In order to
check this property, we introduce stack canary which is a random
number collected at runtime.  Stack top is always filled with this
number and checked for stack smashing operations, when VM_CHECK_MODE.
[GH-1947]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64677 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
shyouhei 2018-09-11 09:48:58 +00:00
parent ecda2d23d5
commit c2bfb4e93c
10 changed files with 279 additions and 1 deletions
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2
random.c
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@ -573,7 +573,7 @@ fill_random_bytes_syscall(void *seed, size_t size, int need_secure)
# define fill_random_bytes_syscall(seed, size, need_secure) -1
#endif
static int
int
fill_random_bytes(void *seed, size_t size, int need_secure)
{
int ret = fill_random_bytes_syscall(seed, size, need_secure);