Source: glibc Version: 2.34-1 Severity: normal X-Debbugs-Cc: jo...@debian.org Control: affects -1 + fakechroot mmdebstrap
Hi, ultimately this probably needs to be fixed in fakechroot but I need some help solving this problem from somebody who understands glibc. Since the upload of glibc 2.34, getpwnam (and friends) under fakechroot are not wrapped anymore. This means that instead of accessing /etc/passwd from the chroot, the version from the host will be accessed, leading to incorrect behaviour. Since mmdebstrap uses fakechroot, this problem affects mmdebstrap as well and breaks its autopkgtest. There was a similar problem in the past. See https://bugs.debian.org/993946 which in the end was fixed by letting fakechroot wrap __nss_files_fopen. I bisected glibc from git between 2.33 and 2.34 and found out, that this fix broke again in this commit: https://sourceware.org/git/?p=glibc.git;a=commit;h=6212bb67f4695962748a5981e1b9fea105af74f6 Do you have any idea why this commit is responsible and what fakechroot could do to fix it? Attached the script I used to setup a minimal chroot to bisect glibc git (this is for future-me in case I need to do this ever again in the future). Thanks! cheers, josch #!/bin/sh set -e rm -rf /install ./* /glibc/configure --prefix=/usr && make -j wget -c http://snapshot.debian.org/archive/debian/20211216T150239Z/pool/main/f/fakechroot/fakechroot_2.20.1%2Bds-2_all.deb wget -c http://snapshot.debian.org/archive/debian/20211216T150239Z/pool/main/f/fakechroot/libfakechroot_2.20.1%2Bds-2_amd64.deb mkdir -p /install/bin /install/lib /install/lib64 /install/dev /install/usr/lib ln -s ../lib/ld.so /install/lib64/ld-linux-x86-64.so.2 ln -s ../../lib64 /install/usr/lib/x86_64-linux-gnu ln -s ../bin /install/usr/bin cp /bin/dash /install/bin/sh cp ./elf/ldconfig /install/bin/ cp /usr/bin/seq /usr/bin/env /bin/bash /usr/bin/tr /usr/bin/basename /usr/bin/getopt /usr/sbin/chroot /bin/echo /install/bin/ cp -a /lib/x86_64-linux-gnu/libtinfo.so.6.2 /install/lib64 ln -s libtinfo.so.6.2 /install/lib64/libtinfo.so.6 cp ./elf/ld.so /install/lib find -name '*.so' -or -name '*.so.*' | xargs -I'{}' cp '{}' /install/lib64 dpkg-deb --fsys-tarfile fakechroot_2.20.1+ds-2_all.deb | tar -C /install --keep-directory-symlink -x dpkg-deb --fsys-tarfile libfakechroot_2.20.1+ds-2_amd64.deb | tar -C /install --keep-directory-symlink -x cp /fakechroot/test/src/test-nss_files_fopen /install/bin/ cp -a /install /chroot mv /chroot /install/chroot echo "user:x:1337:1337:user:/home/user:/bin/bash" > /install/chroot/etc/passwd chroot /install fakechroot --lib /usr/lib/x86_64-linux-gnu/fakechroot/libfakechroot.so /bin/chroot /chroot /bin/test-nss_files_fopen user
