diff options
author | Davidlohr Bueso <dave@stgolabs.net> | 2021-12-10 10:20:58 -0800 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-12-14 10:16:55 +0100 |
commit | 00be34f856c3d7f19cd7a5cd0e84aa4939677186 (patch) | |
tree | ac3f834bb146fbe4f249fc5acc67b32e9a1d51db /block | |
parent | bc6d64c4307a5e7aaa06beea76c81199ba69dbfe (diff) |
block: fix ioprio_get(IOPRIO_WHO_PGRP) vs setuid(2)
commit e6a59aac8a8713f335a37d762db0dbe80e7f6d38 upstream.
do_each_pid_thread(PIDTYPE_PGID) can race with a concurrent
change_pid(PIDTYPE_PGID) that can move the task from one hlist
to another while iterating. Serialize ioprio_get to take
the tasklist_lock in this case, just like it's set counterpart.
Fixes: d69b78ba1de (ioprio: grab rcu_read_lock in sys_ioprio_{set,get}())
Acked-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Link: https://lore.kernel.org/r/20211210182058.43417-1-dave@stgolabs.net
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'block')
-rw-r--r-- | block/ioprio.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/block/ioprio.c b/block/ioprio.c index 6f5d0b6625e3..35bbbcae68f8 100644 --- a/block/ioprio.c +++ b/block/ioprio.c @@ -196,6 +196,7 @@ SYSCALL_DEFINE2(ioprio_get, int, which, int, who) pgrp = task_pgrp(current); else pgrp = find_vpid(who); + read_lock(&tasklist_lock); do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { tmpio = get_task_ioprio(p); if (tmpio < 0) @@ -205,6 +206,8 @@ SYSCALL_DEFINE2(ioprio_get, int, which, int, who) else ret = ioprio_best(ret, tmpio); } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); + read_unlock(&tasklist_lock); + break; case IOPRIO_WHO_USER: uid = make_kuid(current_user_ns(), who); |