Enrico Scholz <[email protected]> writes:
> Seen on scarthgap bc793fa9d1fe24c102d91e97b7002b6e637cbfa5 and it seems
> to be very reproducible (both the failure on ubuntu-20.04 and the success
> on fedora-39).
Can be reproduced manually by setting the PSEUDO environment and
invoking
| pseudo useradd -R `pwd`/rootfs bar1
| pseudo ls -la rootfs/home/bar1
Problem is somewhere in the interpretation of the fstatat() result in
4.14.2/shadow-4.14.2/lib/copydir.c
| 443 if (fstatat(dst->dirfd, dst->name, &sb, AT_SYMLINK_NOFOLLOW) !=
-1) {
| return 0;
| }
|
| + printf("fstatat(%d, %s) -> dev=%d, ino=%d, mode=%o\n",
| + dst->dirfd, dst->name, (int)sb.st_dev, (int)sb.st_ino,
sb.st_mode);
Shows here (content is from /etc/skel)
| fstatat(5, .profile) -> dev=64514, ino=1787061952, mode=15241063300
| fstatat(5, .bashrc) -> dev=64514, ino=1787061952, mode=15241063300
While
| $ stat rootfs/etc/skel/.
| File: rootfs/etc/skel/.bashrc
| Size: 410 Blocks: 8 IO Block: 4096 regular file
| Device: 252,2 Inode: 19552578 Links: 1
is expected.
Pseudo log shows for this call
1914825: wrapper called: __fxstatat
1914825: __fxstatat - signals blocked, obtaining lock
1914825: paes: newpath .../rootfs/etc/skel, element list <.bashrc>
1914825: element to add: '.bashrc'
1914825: pae: '.../rootfs/etc/skel', + '.bashrc', is_dir 1
1914825: paes: append_element gave us '.../rootfs/etc/skel/.bashrc', current ''
1914825: .../rootfs/etc/skel + .bashrc => <.../rootfs/etc/skel/.bashrc>
1914825: base_path[nofollow]: .../rootfs/etc/skel</>.bashrc =>
.../rootfs/etc/skel/.bashrc
1914825: root_path [__fxstatat, 235]: '.../rootfs/etc/skel/.bashrc' from
'.bashrc'
1914825: statat .../rootfs/etc/skel/.bashrc (+buf) (0100755): processing
request [ino 19552578]
1914825: sending request [ino 19552578]
1914825: sending a message: ino 19552578
1914825: msg type 3 (stat), external path .../rootfs/etc/skel/.bashrc, mode
0100755
1914825: wrote 182 bytes
1914825: sent!
Enrico
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