GNU bug report logs - #79194
Segfault with 0 byte symbol

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: a aa <lgray3420 <at> gmail.com>
Subject: bug#79194: closed (bug#79194: Segfault with 0 byte symbol)
Date: Wed, 13 Aug 2025 12:08:02 +0000

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Your bug report

#79194: Segfault with 0 byte symbol

which was filed against the guile package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 79194 <at> debbugs.gnu.org.

-- 
79194: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=79194
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Tomas Volf <~@wolfsden.cz>
To: 79194-done <at> debbugs.gnu.org
Subject: bug#79194: Segfault with 0 byte symbol
Date: Wed, 13 Aug 2025 14:07:17 +0200

Was fixed in 35f13806af653ef9ed656708dddcd1d2c8f8da9e.

Closing.

-- 
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

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From: a aa <lgray3420 <at> gmail.com>
To: bug-guile <at> gnu.org
Subject: Segfault with 0 byte symbol
Date: Thu, 7 Aug 2025 13:35:20 -0400

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Hello,

how to reproduce:
cc main.c `pkg-config --libs --cflags guile-3.0` && ./a.out

incorrect behaviour:
The second parameter for scm_from_utf8_symboln should be how many bytes are
pointed to by the pointer however the pointer still gets read if the length
is zero. Being able to handle 0 byte strings is expected since replacing
the call from scm_from_utf8_symboln to scm_from_utf8_stringn will not have
a segfault and the documentation for this function does not mention being
unable to handle 0 byte strings.

version: 3.0.10 (built from source via gentoo ebuild)

config.guess:
x86_64-pc-linux-gnu

config.status:
--prefix=/usr --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share
--sysconfdir=/etc --localstatedir=/var/lib --datarootdir=/usr/share
--disable-dependency-tracking --disable-silent-rules --disable-static
--docdir=/usr/share/doc/guile-3.0.10-r103
--htmldir=/usr/share/doc/guile-3.0.10-r103/html --with-sysroot=/
--libdir=/usr/lib64 --program-suffix=-3.0
--infodir=/usr/share/guile-data/3.0/info
--with-pkgconfigdir=/usr/share/guile-data/3.0/pkgconfig
--disable-error-on-warning --disable-rpath --disable-lto --enable-posix
--without-libgmp-prefix --without-libiconv-prefix --without-libintl-prefix
--without-libreadline-prefix --without-libunistring-prefix
--disable-guile-debug --disable-debug-malloc --enable-deprecated
--enable-jit --enable-networking --disable-nls --enable-regex
--with-threads build_alias=x86_64-pc-linux-gnu
host_alias=x86_64-pc-linux-gnu CC=gcc 'CFLAGS=-O2 -march=native -pipe
-std=gnu17' LDFLAGS=-fuse-ld=mold
PKG_CONFIG_PATH=/usr/share/guile-data/3.0/pkgconfig

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