cgroup: Fix scanning V1 mount options

The validation in cgroup_find_ctrl did not take into consideration how
we scan V1 mounts. For V1 we try using each mount option as if it is a
controller name. Some mount options contain characters which would be
invalid in a controller name.

This commit ignores errors when scanning V1 mount options.

Ideally we would have a place where we can read the subsys name
knowing that only subsys names will be read from that location. Such
as with V2. One possibility is /proc/cgroups which contains a numeric
value for the hierarchy. However it would require more investigation.

Fixes: #1093
Fixes: 5292c46e5 "cgroup: Handle trailing new line in cgroup.controllers"
Signed-off-by: Richard Palethorpe <rpalethorpe@suse.com>
Reviewed-by: Cyril Hrubis <chrubis@suse.cz>
(cherry picked from commit 6e86277cc5440f781282f8fb982a810b7a5e5a5d)
Test: N/A
Signed-off-by: Edward Liaw <edliaw@google.com>
(cherry picked from https://android-review.googlesource.com/q/commit:22ab8b7c2f44bf29435b14435da3597aedd163d0)
Bug: 305297408
Change-Id: I11e47073bcdafda0a847ddf95bb52a889f498c6b
Merged-In: I11e47073bcdafda0a847ddf95bb52a889f498c6b

0 files changed, 0 insertions, 0 deletions