NetBSD-Bugs archive
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]
Re: lib/57756: Incorrect order of .fini_array indirect functions calling
The following reply was made to PR lib/57756; it has been noted by GNATS.
From: Dmitry Chestnykh <Dmitry.Chestnykh%kaspersky.com@localhost>
To: "lib-bug-people%netbsd.org@localhost" <lib-bug-people%netbsd.org@localhost>,
"gnats-admin%netbsd.org@localhost" <gnats-admin%netbsd.org@localhost>, "netbsd-bugs%netbsd.org@localhost"
<netbsd-bugs%netbsd.org@localhost>, "gnats-bugs%netbsd.org@localhost" <gnats-bugs%netbsd.org@localhost>
Cc:
Subject: Re: lib/57756: Incorrect order of .fini_array indirect functions
calling
Date: Wed, 6 Dec 2023 14:08:25 +0000
--_000_ffd77eb00ec643c1b1065de2fd4adfa3kasperskycom_
Content-Type: text/plain; charset="koi8-r"
Content-Transfer-Encoding: quoted-printable
Additionally from the https://docs.oracle.com/cd/E19683-01/817-1983/6mhm6r4=
es/index.html :
"If an object contains both .init and .init_array sections, the .init secti=
on is processed before the functions defined by the .init_array section for=
that object."
So we also have incorrect order of _init() and _initarray() inside crt0-com=
mon.c. _init() has to be called before _initarray(); glibc does the same
Updated patch:
diff -Naur lib/csu/common.orig/crt0-common.c lib/csu/common/crt0-common.c
--- a/lib/csu/common/crt0-common.c 2023-12-05 23:04:36.330759078 +0300
+++ b/lib/csu/common/crt0-common.c 2023-12-06 17:08:43.037463722 +0300
@@ -121,8 +121,9 @@
static void
_finiarray(void)
{
- for (const fptr_t *f =3D __fini_array_start; f < __fini_array_end; =
f++) {
- (*f)();
+ size_t i =3D __fini_array_end - __fini_array_start;
+ while (i-- > 0) {
+ (*__fini_array_start[i])();
}
}
@@ -340,11 +341,13 @@
#endif
atexit(_finiarray);
+#ifndef HAVE_INITFINI_ARRAY
+ _init();
+#endif
_initarray();
#ifndef HAVE_INITFINI_ARRAY
atexit(_fini);
- _init();
#endif
exit(main(ps_strings->ps_nargvstr, ps_strings->ps_argvstr, environ)=
);
________________________________
From: Valery Ushakov <uwe%stderr.spb.ru@localhost>
Sent: Wednesday, December 6, 2023 4:35:01 PM
To: lib-bug-people%netbsd.org@localhost; gnats-admin%netbsd.org@localhost; netbsd-bugs@netbsd.o=
rg; Dmitry Chestnykh
Subject: Re: lib/57756: Incorrect order of .fini_array indirect functions c=
alling
Caution: This is an external email. Be cautious while opening links or atta=
chments.
The following reply was made to PR lib/57756; it has been noted by GNATS.
From: Valery Ushakov <uwe%stderr.spb.ru@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc:
Subject: Re: lib/57756: Incorrect order of .fini_array indirect functions
calling
Date: Wed, 6 Dec 2023 16:30:13 +0300
To provide chapter and verse:
https://docs.oracle.com/cd/E19683-01/817-1983/6mhm6r4es/index.html
The runtime linker executes functions whose addresses are contained in
the .fini_array section. These functions are executed in the reverse
order in which their addresses appear in the array. The runtime
linker executes a .fini section as an individual function. If an
object contains both .fini and .fini_array sections, the functions
defined by the .fini_array section are processed before the .fini
section for that object.
--_000_ffd77eb00ec643c1b1065de2fd4adfa3kasperskycom_
Content-Type: text/html; charset="koi8-r"
Content-Transfer-Encoding: quoted-printable
<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dkoi8-r">
<meta name=3D"Generator" content=3D"Microsoft Exchange Server">
<!-- converted from text --><style><!-- .EmailQuote { margin-left: 1pt; pad=
ding-left: 4pt; border-left: #800000 2px solid; } --></style>
</head>
<body>
<meta content=3D"text/html; charset=3DUTF-8">
<style type=3D"text/css" style=3D"">
<!--
p
{margin-top:0;
margin-bottom:0}
-->
</style>
<div dir=3D"ltr">
<div id=3D"x_divtagdefaultwrapper" dir=3D"ltr" style=3D"font-size:12pt; col=
or:#000000; font-family:Calibri,Helvetica,sans-serif">
<p>Additionally from the <a href=3D"https://docs.oracle.com/cd/E19683-01/81=
7-1983/6mhm6r4es/index.html" class=3D"x_OWAAutoLink" id=3D"LPlnk641889">
https://docs.oracle.com/cd/E19683-01/817-1983/6mhm6r4es/index.html</a> :<br=
>
</p>
<div>"If an object contains both <tt>.init</tt> and <tt>.init_array</t=
t> sections, the
<tt>.init</tt> section is processed before the functions defined by the <tt=
>.init_array</tt> section for that object."<br>
<br>
So we also have incorrect order of _init() and _initarray() inside crt0-com=
mon.c. _init() has to be called before _initarray(); glibc does the same<br=
>
</div>
<div><br>
Updated patch:<br>
<div>diff -Naur lib/csu/common.orig/crt0-common.c lib/csu/common/crt0-commo=
n.c <br>
--- a/lib/csu/common/crt0-common.c 2023-12-05=
23:04:36.330759078 +0300 <br>
+++ b/lib/csu/common/crt0-common.c  =
; 2023-12-06 17:08:43.037463722 +0300 <br>
@@ -121,8 +121,9 @@ <br>
static void <br>
_finiarray(void) <br>
{ <br>
- for (const fptr_t *f =3D __fini_array=
_start; f < __fini_array_end; f++) { <br>
- &n=
bsp; (*f)(); <br>
+ size_t i =3D __fini_array_end - _=
_fini_array_start; <br>
+ while (i-- > 0) { <br>
+ &nbs=
p; (*__fini_array_start[i])(); <br>
} <br>
} <br>
<br>
@@ -340,11 +341,13 @@ <br>
#endif <br>
<br>
atexit(_finiarray); <br>
+#ifndef HAVE_INITFINI_ARRAY <br>
+ _init(); <br>
+#endif <br>
_initarray(); <br>
<br>
#ifndef HAVE_INITFINI_ARRAY <br>
atexit(_fini); <br>
- _init(); <br>
#endif <br>
<br>
exit(main(ps_strings->ps_narg=
vstr, ps_strings->ps_argvstr, environ));</div>
<br>
</div>
<br>
<p></p>
</div>
<hr tabindex=3D"-1" style=3D"display:inline-block; width:98%">
<div id=3D"x_divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" =
color=3D"#000000" style=3D"font-size:11pt"><b>From:</b> Valery Ushakov <=
uwe%stderr.spb.ru@localhost><br>
<b>Sent:</b> Wednesday, December 6, 2023 4:35:01 PM<br>
<b>To:</b> lib-bug-people%netbsd.org@localhost; gnats-admin%netbsd.org@localhost; netbsd-bugs@n=
etbsd.org; Dmitry Chestnykh<br>
<b>Subject:</b> Re: lib/57756: Incorrect order of .fini_array indirect func=
tions calling</font>
<div> </div>
</div>
</div>
<font size=3D"2"><span style=3D"font-size:10pt;">
<div class=3D"PlainText">Caution: This is an external email. Be cautious wh=
ile opening links or attachments.<br>
<br>
<br>
<br>
The following reply was made to PR lib/57756; it has been noted by GNATS.<b=
r>
<br>
From: Valery Ushakov <uwe%stderr.spb.ru@localhost><br>
To: gnats-bugs%netbsd.org@localhost<br>
Cc:<br>
Subject: Re: lib/57756: Incorrect order of .fini_array indirect functions<b=
r>
calling<br>
Date: Wed, 6 Dec 2023 16:30:13 +0300<br>
<br>
To provide chapter and verse:<br>
<br>
<a href=3D"https://docs.oracle.com/cd/E19683-01/817-1983/6mhm6r4es/in=
dex.html">https://docs.oracle.com/cd/E19683-01/817-1983/6mhm6r4es/index.htm=
l</a><br>
<br>
The runtime linker executes functions whose addresses are contained i=
n<br>
the .fini_array section. These functions are executed in the re=
verse<br>
order in which their addresses appear in the array. The runtime=
<br>
linker executes a .fini section as an individual function. If a=
n<br>
object contains both .fini and .fini_array sections, the functions<br=
>
defined by the .fini_array section are processed before the .fini<br>
section for that object.<br>
<br>
</div>
</span></font>
</body>
</html>
--_000_ffd77eb00ec643c1b1065de2fd4adfa3kasperskycom_--
Home |
Main Index |
Thread Index |
Old Index