[PATCH v2 3/3] liveupdate: block outgoing session mutations

[Pratyush Yadav]

On Wed, May 06 2026, Pasha Tatashin wrote:

> During the reboot() syscall, user processes may still be running
> concurrently and attempting to mutate sessions (e.g., adding files or
> closing sessions). To prevent this, hold the session header's rwsem and
> each session's mutex indefinitely on successful serialization.
>
> If serialization succeeds, these locks will never be released as the
> system transitions to the new kernel, effectively blocking any
> concurrent task attempting to modify or release a session. If
> liveupdate_reboot() fails, the locks are released in the error path,
> allowing normal operation to resume.
>
> Fixes: 0153094d03df ("liveupdate: luo_session: add sessions support")
> Reported-by: Oskar Gerlicz Kowalczuk <oskar at gerlicz.space>
> Signed-off-by: Pasha Tatashin <pasha.tatashin at soleen.com>

Reviewed-by: Pratyush Yadav (Google) <pratyush at kernel.org>

[...]

-- 
Regards,
Pratyush Yadav