From: DJ Delorie <dj@redhat.com>
To: Anthony Green <green@redhat.com>
Cc: libffi-discuss@sourceware.org, fweimer@redhat.com
Subject: Re: segfault in ffi_data_to_code_pointer
Date: Wed, 03 Jul 2019 22:54:00 -0000 [thread overview]
Message-ID: <xnftnmsp9x.fsf@greed.delorie.com> (raw)
In-Reply-To: <875zoirazv.fsf@laptop.atgreen.org> (message from Anthony Green on Wed, 03 Jul 2019 18:47:48 -0400)
Anthony Green <green@redhat.com> writes:
> No, they should be using ffi_closure_alloc().
>
> Can you point me at the ruby code that does this?
ruby 2.6.3
ext/fiddle/closure.c
In the failing case, USE_FFI_CLOSURE_ALLOC is not set
static VALUE
allocate(VALUE klass)
{
fiddle_closure * closure;
VALUE i = TypedData_Make_Struct(klass, fiddle_closure,
&closure_data_type, closure);
fprintf (stderr, "DJ: allocate\n");
#if USE_FFI_CLOSURE_ALLOC
closure->pcl = ffi_closure_alloc(sizeof(ffi_closure), &closure->code);
#else
closure->pcl = mmap(NULL, sizeof(ffi_closure), PROT_READ | PROT_WRITE,
MAP_ANON | MAP_PRIVATE, -1, 0);
#endif
return i;
}
initialize()
{
. . .
#if USE_FFI_CLOSURE_ALLOC
result = ffi_prep_closure_loc(pcl, cif, callback,
(void *)self, cl->code);
#else
result = ffi_prep_closure(pcl, cif, callback, (void *)self);
cl->code = (void *)pcl;
i = mprotect(pcl, sizeof(*pcl), PROT_READ | PROT_EXEC);
if (i) {
rb_sys_fail("mprotect");
}
#endif
. . .
}
next prev parent reply other threads:[~2019-07-03 22:54 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-26 20:55 DJ Delorie
2019-06-30 11:46 ` Anthony Green
2019-07-02 23:47 ` DJ Delorie
2019-07-03 22:28 ` DJ Delorie
2019-07-03 22:47 ` Anthony Green
2019-07-03 22:54 ` DJ Delorie [this message]
2019-07-03 23:14 ` Anthony Green
2019-07-04 0:19 ` DJ Delorie
2019-07-04 12:35 ` Florian Weimer
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