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How do operator/wheel groups work on FreeBSD?
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 23, 2019 at 00:00UTC (8:00pm US/Eastern)
2019 Community Moderator Election Results
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On FreeBSD 12.0-RELEASE-p3 ls -l /dev/ada1 gives me:
crw-r----- 1 root operator [skipped] /dev/ada1
If I use the command gpart recover /dev/ada1 from a non-root user account, who is in the group operator (and wheel), gpart does the recovery. It definitely writes on the disk.
But why does the non-root user not just have read permissions for the disk? The group operator has only read permissions for /dev/ada1!
The sudoers file only consists of:
% grep -v '^#' /usr/local/etc/sudoers | grep -v '^$'
root ALL=(ALL) ALL
permissions freebsd
edited 3 hours ago
mosvy
10.3k11238
asked 6 hours ago
wolf-revo-catswolf-revo-cats
9021036
add a comment |
On FreeBSD 12.0-RELEASE-p3 ls -l /dev/ada1 gives me:
crw-r----- 1 root operator [skipped] /dev/ada1
If I use the command gpart recover /dev/ada1 from a non-root user account, who is in the group operator (and wheel), gpart does the recovery. It definitely writes on the disk.
But why does the non-root user not just have read permissions for the disk? The group operator has only read permissions for /dev/ada1!
The sudoers file only consists of:
% grep -v '^#' /usr/local/etc/sudoers | grep -v '^$'
root ALL=(ALL) ALL
permissions freebsd
edited 3 hours ago
mosvy
10.3k11238
asked 6 hours ago
wolf-revo-catswolf-revo-cats
9021036
Check /usr/local/etc/sudoers
– Vladimir Botka
5 hours ago
2
@VladimirBotka I don't see how this can be the reason…
– wolf-revo-cats
5 hours ago
add a comment |
On FreeBSD 12.0-RELEASE-p3 ls -l /dev/ada1 gives me:
crw-r----- 1 root operator [skipped] /dev/ada1
If I use the command gpart recover /dev/ada1 from a non-root user account, who is in the group operator (and wheel), gpart does the recovery. It definitely writes on the disk.
But why does the non-root user not just have read permissions for the disk? The group operator has only read permissions for /dev/ada1!
The sudoers file only consists of:
% grep -v '^#' /usr/local/etc/sudoers | grep -v '^$'
root ALL=(ALL) ALL
permissions freebsd
edited 3 hours ago
mosvy
10.3k11238
asked 6 hours ago
wolf-revo-catswolf-revo-cats
9021036
On FreeBSD 12.0-RELEASE-p3 ls -l /dev/ada1 gives me:
crw-r----- 1 root operator [skipped] /dev/ada1
If I use the command gpart recover /dev/ada1 from a non-root user account, who is in the group operator (and wheel), gpart does the recovery. It definitely writes on the disk.
But why does the non-root user not just have read permissions for the disk? The group operator has only read permissions for /dev/ada1!
The sudoers file only consists of:
% grep -v '^#' /usr/local/etc/sudoers | grep -v '^$'
root ALL=(ALL) ALL
permissions freebsd
permissions freebsd
edited 3 hours ago
mosvy
10.3k11238
asked 6 hours ago
wolf-revo-catswolf-revo-cats
9021036
edited 3 hours ago
mosvy
10.3k11238
asked 6 hours ago
wolf-revo-catswolf-revo-cats
9021036
edited 3 hours ago
mosvy
10.3k11238
edited 3 hours ago
mosvy
10.3k11238
edited 3 hours ago
mosvy
10.3k11238
10.3k11238
asked 6 hours ago
wolf-revo-catswolf-revo-cats
9021036
asked 6 hours ago
wolf-revo-catswolf-revo-cats
9021036
asked 6 hours ago
wolf-revo-catswolf-revo-cats
9021036
9021036
Check /usr/local/etc/sudoers
– Vladimir Botka
5 hours ago
2
@VladimirBotka I don't see how this can be the reason…
– wolf-revo-cats
5 hours ago
add a comment |
Check /usr/local/etc/sudoers
– Vladimir Botka
5 hours ago
2
@VladimirBotka I don't see how this can be the reason…
– wolf-revo-cats
5 hours ago
Check /usr/local/etc/sudoers
– Vladimir Botka
5 hours ago
Check /usr/local/etc/sudoers
– Vladimir Botka
5 hours ago
2
2
@VladimirBotka I don't see how this can be the reason…
– wolf-revo-cats
5 hours ago
@VladimirBotka I don't see how this can be the reason…
– wolf-revo-cats
5 hours ago
add a comment |
1 Answer
1
active
oldest
votes
The gpart(1) program doesn't write anything to /dev/ada1.
It does all its operations by issuing GEOM_CTL ioctls on /dev/geom.ctl. In order to use ioctl(2) on a device file, you don't need write permissions to it; you only need to be able to open() it in read-only mode. And the operator group has read permissions on /dev/geom.ctl.
answered 3 hours ago
mosvymosvy
10.3k11238
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
The gpart(1) program doesn't write anything to /dev/ada1.
It does all its operations by issuing GEOM_CTL ioctls on /dev/geom.ctl. In order to use ioctl(2) on a device file, you don't need write permissions to it; you only need to be able to open() it in read-only mode. And the operator group has read permissions on /dev/geom.ctl.
answered 3 hours ago
mosvymosvy
10.3k11238
add a comment |
The gpart(1) program doesn't write anything to /dev/ada1.
It does all its operations by issuing GEOM_CTL ioctls on /dev/geom.ctl. In order to use ioctl(2) on a device file, you don't need write permissions to it; you only need to be able to open() it in read-only mode. And the operator group has read permissions on /dev/geom.ctl.
answered 3 hours ago
mosvymosvy
10.3k11238
add a comment |
The gpart(1) program doesn't write anything to /dev/ada1.
It does all its operations by issuing GEOM_CTL ioctls on /dev/geom.ctl. In order to use ioctl(2) on a device file, you don't need write permissions to it; you only need to be able to open() it in read-only mode. And the operator group has read permissions on /dev/geom.ctl.
answered 3 hours ago
mosvymosvy
10.3k11238
The gpart(1) program doesn't write anything to /dev/ada1.
It does all its operations by issuing GEOM_CTL ioctls on /dev/geom.ctl. In order to use ioctl(2) on a device file, you don't need write permissions to it; you only need to be able to open() it in read-only mode. And the operator group has read permissions on /dev/geom.ctl.
answered 3 hours ago
mosvymosvy
10.3k11238
edited 3 hours ago
answered 3 hours ago
mosvymosvy
10.3k11238
answered 3 hours ago
mosvymosvy
10.3k11238
answered 3 hours ago
mosvymosvy
10.3k11238
10.3k11238
add a comment |
add a comment |
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Check /usr/local/etc/sudoers
– Vladimir Botka
5 hours ago
2
@VladimirBotka I don't see how this can be the reason…
– wolf-revo-cats
5 hours ago