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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: "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 14:28:46 +0000
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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)=
);
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erif" size=3D"3" color=3D"black" style=3D"font-family:sans-serif,Calibri,He=
lvetica,serif,"EmojiFont""><span id=3D"x_x_divtagdefaultwrapper" =
style=3D"font-size:12pt">
<div style=3D"margin-top:0; margin-bottom:0">Additionally from the <a href=
=3D"https://docs.oracle.com/cd/E19683-01/817-1983/6mhm6r4es/index.html"; tar=
get=3D"_blank" rel=3D"noopener noreferrer" id=3D"LPlnk641889">
<span id=3D"LPlnk641889">https://docs.oracle.com/cd/E19683-01/817-1983/6mhm=
6r4es/index.html</span></a> :<br>
</div>
<div>"If an object contains both <font face=3D"Courier New" style=3D"f=
ont-family:serif,Courier New,serif,"EmojiFont"">
.init</font> and <font face=3D"Courier New" style=3D"font-family:serif,Cour=
ier New,serif,"EmojiFont"">
.init_array</font> sections, the <font face=3D"Courier New" style=3D"font-f=
amily:serif,Courier New,serif,"EmojiFont"">
.init</font> section is processed before the functions defined by the <font=
face=3D"Courier New" style=3D"font-family:serif,Courier New,serif,"Em=
ojiFont"">
.init_array</font> 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>
</div>
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