Can you test the following kernels and report back? We are looking for the first kernel version that exhibits this bug:
For 4.14 and earlier kernels, install the linux-image and linux-image-extra .deb packages: 4.14.0-11: https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/bootstrap/+build/13813977 4.14.0-16: https://launchpad.net/~canonical-kernel-security- team/+archive/ubuntu/ppa2/+build/14223014 4.15.0-9: https://launchpad.net/ubuntu/+source/linux/4.15.0-9.10/+build/14326410 4.15.0-20: https://launchpad.net/ubuntu/+source/linux/4.15.0-20.21/+build/14791489 You don't have to test every kernel, just up until the kernel that first has this bug. Thanks in advance! -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1794067 Title: Bug in selinux on ubuntu 16.04 with kernel 4.15.0-34 Status in linux package in Ubuntu: In Progress Status in linux source package in Bionic: In Progress Bug description: Hello, just found a bug in selinux. Whats going wrong: Copy a link with "-a" option while selinux is on. steps to reproduce: ~$ mkdir -p a/b ~$ ln -s b a/c ~$ cp -a a b cp: failed to restore the default file creation context: Invalid argument Results of my investigation: The "cp" of coreutils is calling "setfscreatecon (NULL)" to restore the default file creation context (coreutils-8.30/src/copy.c:1771) as it is stated in the selinux api (/libselinux/include/selinux/selinux.h:71). As we see in the result of strace below, the kernel returns an -1 on try to restore the default file creation context. So in my opinion is the bug has to be in the selinux_setprocattr method in the security/selinux/hooks.c file. Part of "strace cp -a a b" lgetxattr("a/c", "security.selinux", "system_u:object_r:user_home_dir_t:s0", 255) = 37 readlink("a/c", "b", 2) = 1 symlink("b", "b/a/c") = 0 open("/proc/self/task/2136/attr/fscreate", O_RDWR|O_CLOEXEC) = 3 write(3, NULL, 0) = -1 EINVAL (Invalid argument) close(3) = 0 open("/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=2995, ...}) = 0 read(3, "# Locale name alias data base.\n#"..., 4096) = 2995 read(3, "", 4096) = 0 close(3) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1794067/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
