AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-11-24 15:20:58 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

sched/autogroup: Fix race with task_groups list

Browse Source 
In autogroup_create(), a tg is allocated and added to the task_groups
list. If CONFIG_RT_GROUP_SCHED is set, this tg is then modified while on
the list, without locking. This can race with someone walking the list,
like __enable_runtime() during CPU unplug, and result in a use-after-free
bug.

To fix this, move sched_online_group(), which adds the tg to the list,
to the end of the autogroup_create() function after the modification.

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1369411669-46971-2-git-send-email-gerald.schaefer@de.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Gerald Schaefer 2013-05-24 18:07:49 +02:00 committed by Ingo Molnar
parent d07e75a6e0
commit 41261b6a83
1 changed files with 1 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
kernel/sched/auto_group.c
View File

@ -77,8 +77,6 @@ static inline struct autogroup *autogroup_create(void)
if (IS_ERR(tg))
goto out_free;
sched_online_group(tg, &root_task_group);
kref_init(&ag->kref);
init_rwsem(&ag->lock);
ag->id = atomic_inc_return(&autogroup_seq_nr);
@ -98,6 +96,7 @@ static inline struct autogroup *autogroup_create(void)
#endif
tg->autogroup = ag;
sched_online_group(tg, &root_task_group);
return ag;
out_free: