[Pkg-samba-maint] Bug#739004: samba: can't save into a write-only directory
Michael Gold
mgold at qnx.com
Fri Feb 14 20:17:42 UTC 2014
Package: samba
Version: 2:4.0.11+dfsg-1
Samba clients used to be able to copy files into write-only directories,
but at some point in the last year this stopped working.
To reproduce, create a write-only directory on the Samba server:
mkdir -m 733 writeonly
Then mount it from a client and try to write into it:
echo x > /in/writeonly/test
/bin/sh: cannot create /in/writeonly/test: Permission denied
I have no trouble creating a file locally:
su -s /bin/sh -c 'echo x > ~mgold/shared/inbox/writeonly/local' smbd
The strace output on the server shows that smbd is trying to open the
write-only directory:
stat("writeonly/test", 0x7fff53c91a40) = -1 ENOENT (No such file or directory)
stat("writeonly", {st_mode=S_IFDIR|S_ISGID|0733, st_size=4096, ...}) = 0
stat("writeonly/test", 0x7fff53c91a40) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "writeonly", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = -1 EACCES (Permission denied)
I'm guessing it wants the FD so it can pass that to another openat call
with the filename. If so, the directory should be opened with O_SEARCH
(POSIX) or O_PATH (Linux) so read permission is not required.
- Michael
-- System Information:
Debian Release: jessie/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 3.12-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_CA.UTF-8, LC_CTYPE=en_CA.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages samba depends on:
ii adduser 3.113+nmu3
ii dpkg 1.17.5
ii libbsd0 0.6.0-1
ii libc6 2.17-97
ii libldb1 1:1.1.16-1
ii libpam-modules 1.1.3-9
ii libpam-runtime 1.1.3-9
ii libpopt0 1.16-8
ii libroken18-heimdal 1.6~git20131117+dfsg-3
ii libtalloc2 2.1.0-1
ii libtdb1 1.2.12-1
ii libtevent0 0.9.19-1
ii lsb-base 4.1+Debian12
ii procps 1:3.3.4-2
ii python 2.7.5-5
ii python-dnspython 1.11.1-1
ii python-samba 2:4.0.11+dfsg-1
pn python2.7:any <none>
ii samba-common 2:4.0.11+dfsg-1
ii samba-common-bin 2:4.0.11+dfsg-1
ii samba-dsdb-modules 2:4.0.11+dfsg-1
ii samba-libs 2:4.0.11+dfsg-1
ii tdb-tools 1.2.12-1
ii update-inetd 4.43
Versions of packages samba recommends:
ii attr 1:2.4.47-1
ii logrotate 3.8.6-1
Versions of packages samba suggests:
pn bind9 <none>
pn bind9utils <none>
pn ctdb <none>
pn ldb-tools <none>
ii ntp 1:4.2.6.p5+dfsg-3
pn smbldap-tools <none>
pn winbind <none>
-- debconf information:
samba-common/title:
samba/run_mode: daemons
samba/generate_smbpasswd: true
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