Hello,
On 2018-11-15 17:39, Christoph Pleger wrote:
Unfortunately - though these UIDs are all set to 0 - lvcreate still
does not work for me. That is, it does work when I call my
setuid-binary as a non-root user from the command line, but it does
not work when I call my setuid-binary from PAM module pam_exec - and
that is what I need my program for. I let my program send lvcreate
output to a file and that file has the following content:
device-mapper: version ioctl on failed: Permission denied
Incompatible libdevmapper 1.02.137 (2016-11-30) and kernel driver
(unknown version).
striped: Required device-mapper target(s) not detected in your
kernel.
Run `lvcreate --help' for more information.
What might be the problem here so that lvcreate gives these errors
though all UIDs are 0?
No matter if I use that setuid-mechanism in the end or not, I would
still like to know why it does not work as-is with lvcreate. :-)
I guess that the error message "device-mapper: version ioctl on failed:
Permission denied" comes from the following lines in LVM's
libdm/ioctl/libdm-iface.c:
if (_log_suppress || dmt->ioctl_errno == EINTR)
log_verbose("device-mapper: %s ioctl on %s%s%s%.0d%s%.0d%s%s "
"failed: %s",
_cmd_data_v4[dmt->type].name,
dmi->name, dmi->uuid,
dmt->major > 0 ? "(" : "",
dmt->major > 0 ? dmt->major : 0,
dmt->major > 0 ? ":" : "",
dmt->minor > 0 ? dmt->minor : 0,
dmt->major > 0 && dmt->minor == 0 ? "0" : "",
dmt->major > 0 ? ")" : "",
strerror(dmt->ioctl_errno));
else
log_error("device-mapper: %s ioctl on %s%s%s%.0d%s%.0d%s%s "
"failed: %s",
_cmd_data_v4[dmt->type].name,
dmi->name, dmi->uuid,
dmt->major > 0 ? "(" : "",
dmt->major > 0 ? dmt->major : 0,
dmt->major > 0 ? ":" : "",
dmt->minor > 0 ? dmt->minor : 0,
dmt->major > 0 && dmt->minor == 0 ? "0" : "",
dmt->major > 0 ? ")" : "",
strerror(dmt->ioctl_errno));
But somehow, the values are empty ...
Regards
Christoph
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