** Also affects: zfs-linux (Ubuntu Impish)
Importance: Medium
Assignee: Colin Ian King (colin-king)
Status: In Progress
** Also affects: zfs-linux (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Changed in: zfs-linux (Ubuntu Hirsute)
Assignee: (unassigned) => Colin Ian King (colin-king)
** Changed in: zfs-linux (Ubuntu Hirsute)
Status: New => In Progress
** Changed in: zfs-linux (Ubuntu Hirsute)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1942991
Title:
zfs: can't read /proc/sys/kernel/spl/hostid
Status in zfs-linux package in Ubuntu:
In Progress
Status in zfs-linux source package in Hirsute:
In Progress
Status in zfs-linux source package in Impish:
In Progress
Bug description:
Reading /proc/sys/kernel/spl/hostid no longer works in 5.7+ kernels
upwards.
The Fix:
commit 7de4c88b39473f358add601e8c227ca9002b1bee
Author: наб <[email protected]>
Date: Sun Apr 11 01:18:40 2021 +0200
linux/spl: base proc_dohostid() on proc_dostring()
This fixes /proc/sys/kernel/spl/hostid on kernels with mainline commit
32927393dc1ccd60fb2bdc05b9e8e88753761469 ("sysctl: pass kernel pointers
to ->proc_handler") ‒ 5.7-rc1 and up
The access_ok() check in copy_to_user() in proc_copyout_string() would
always fail, so all userspace reads and writes would fail with EINVAL
proc_dostring() strips only the final new-line,
but simple_strtoul() doesn't actually need a back-trimmed string ‒
writing "012345678 \n" is still allowed, as is "012345678zupsko", &c.
This alters what happens when an invalid value is written ‒
previously it'd get set to what-ever simple_strtoul() returned
(probably 0, thereby resetting it to default), now it does nothing
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Ahelenia Ziemiańska <[email protected]>
Closes #11878
Closes #11879
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