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| author | Qian Cai <cai@lca.pw> | 2020-02-23 22:00:07 -0500 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2020-03-04 11:15:58 -0500 |
| commit | 190ecb190a9cd8c0599d8499b901e3c32e87966a (patch) | |
| tree | 2893bb1920caa0d2912bc1bdc415333f4ce3aad0 /lib/zlib_deflate | |
| parent | 9c974c77246460fa6a92c18554c3311c8c83c160 (diff) | |
| download | lwn-190ecb190a9cd8c0599d8499b901e3c32e87966a.tar.gz lwn-190ecb190a9cd8c0599d8499b901e3c32e87966a.zip | |
cgroup: fix psi_show() crash on 32bit ino archs
Similar to the commit d7495343228f ("cgroup: fix incorrect
WARN_ON_ONCE() in cgroup_setup_root()"), cgroup_id(root_cgrp) does not
equal to 1 on 32bit ino archs which triggers all sorts of issues with
psi_show() on s390x. For example,
BUG: KASAN: slab-out-of-bounds in collect_percpu_times+0x2d0/
Read of size 4 at addr 000000001e0ce000 by task read_all/3667
collect_percpu_times+0x2d0/0x798
psi_show+0x7c/0x2a8
seq_read+0x2ac/0x830
vfs_read+0x92/0x150
ksys_read+0xe2/0x188
system_call+0xd8/0x2b4
Fix it by using cgroup_ino().
Fixes: 743210386c03 ("cgroup: use cgrp->kn->id as the cgroup ID")
Signed-off-by: Qian Cai <cai@lca.pw>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org # v5.5
Diffstat (limited to 'lib/zlib_deflate')
0 files changed, 0 insertions, 0 deletions