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From: "siddhesh at sourceware dot org" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug libc/29141] _FORTIFY_SOURCE=3 fail for gcc 12/glibc 2.35
Date: Fri, 13 May 2022 04:02:17 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29141

--- Comment #6 from Siddhesh Poyarekar <siddhesh at sourceware dot org> ---
(In reply to Petr Ovtchenkov from comment #5)
> Hmm. c8ee1c8 not correspond to diff you show above.

Ah, sorry no, they're two different things that I formatted very badly maki=
ng
it seem like it's one thing.  The commit that introduced the regression:

commit c8ee1c85c07b3c9eaef46355cb1095300855e8fa
Author: Joan Bruguera <joanbrugueram@gmail.com>
Date:   Mon Apr 11 19:49:56 2022 +0200

    misc: Fix rare fortify crash on wchar funcs. [BZ 29030]

and then the one line fix for it that I'm about to post:

diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
index f1faf8292c..1c2b044a0d 100644
--- a/misc/sys/cdefs.h
+++ b/misc/sys/cdefs.h
@@ -164,7 +164,7 @@
 /* Length is known to be safe at compile time if the __L * __S <=3D __OBJSZ
    condition can be folded to a constant and if it is true, or unknown (-1=
) */
 #define __glibc_safe_or_unknown_len(__l, __s, __osz) \
-  ((__osz) =3D=3D (__SIZE_TYPE__) -1                                      =
       \
+  ((__builtin_constant_p (__osz) && (__osz) =3D=3D (__SIZE_TYPE__) -1)    =
       \
    || (__glibc_unsigned_or_positive (__l)                                 =
   \
        && __builtin_constant_p (__glibc_safe_len_cond ((__SIZE_TYPE__) (__=
l),
\
                                                       (__s), (__osz)))    =
   \

--=20
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