It looks that the root cause affects multiple packages.
Observations: programs like lvchange have a similar problem:
# lvresize -L +1M /dev/mapper/vg-home
SELinux context reset: setfscreatecon failed: Invalid argument
SELinux context reset: setfscreatecon failed: Invalid argument
...
It looks that the problem might be in the libselinux (procattr.c
setprocattrcon_raw):
ret = write(fd, NULL, 0); /* clear */
This always returns 'Invalid argument'.
I was not able to reproduce this with standard system tools (echo, cat, tee,
...).
Therefore I wrote some lines of C (attached):
root@ubuntu:~# strace -f ./w2
...
openat(AT_FDCWD, "/proc/thread-self/attr/fscreate", O_RDWR|O_CLOEXEC) = 3
write(3, NULL, 0) = -1 EINVAL (Invalid argument)
dup(2) = 4
fcntl(4, F_GETFL) = 0x2 (flags O_RDWR)
brk(NULL) = 0x55af7b32a000
brk(0x55af7b34b000) = 0x55af7b34b000
fstat(4, {st_mode=S_IFCHR|0600, st_rdev=makedev(136, 0), ...}) = 0
write(4, "write: Invalid argument\n", 24write: Invalid argument
) = 24
close(4) = 0
rt_sigprocmask(SIG_UNBLOCK, [ABRT], NULL, 8) = 0
rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1], [], 8) = 0
getpid() = 10408
gettid() = 10408
tgkill(10408, 10408, SIGABRT) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
--- SIGABRT {si_signo=SIGABRT, si_code=SI_TKILL, si_pid=10408, si_uid=0} ---
+++ killed by SIGABRT +++
Aborted
I have no idea if this write(fd, NULL, 0) should work to reset the
attribute (then it might be a kernel /proc problem) or if the library
needs to use another mechanism to reset the content.
** Attachment added: "w2.c"
https://bugs.launchpad.net/ubuntu/+source/shadow/+bug/1769301/+attachment/5134236/+files/w2.c
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https://bugs.launchpad.net/bugs/1769301
Title:
resetting /proc/thread-self/attr/fscreate results in 'Invalid
Argument'
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