diff options
| author | Ben Segall <bsegall@google.com> | 2015-11-06 16:32:48 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-06 17:50:42 -0800 |
| commit | 8639b46139b0e4ea3b1ab1c274e410ee327f1d89 (patch) | |
| tree | ef62c65fa87b03133678a76aba7a6e50a24a2c0d /block | |
| parent | de90a6bcaede81f35e8caf4566d1006267230377 (diff) | |
pidns: fix set/getpriority and ioprio_set/get in PRIO_USER mode
setpriority(PRIO_USER, 0, x) will change the priority of tasks outside of
the current pid namespace. This is in contrast to both the other modes of
setpriority and the example of kill(-1). Fix this. getpriority and
ioprio have the same failure mode, fix them too.
Eric said:
: After some more thinking about it this patch sounds justifiable.
:
: My goal with namespaces is not to build perfect isolation mechanisms
: as that can get into ill defined territory, but to build well defined
: mechanisms. And to handle the corner cases so you can use only
: a single namespace with well defined results.
:
: In this case you have found the two interfaces I am aware of that
: identify processes by uid instead of by pid. Which quite frankly is
: weird. Unfortunately the weird unexpected cases are hard to handle
: in the usual way.
:
: I was hoping for a little more information. Changes like this one we
: have to be careful of because someone might be depending on the current
: behavior. I don't think they are and I do think this make sense as part
: of the pid namespace.
Signed-off-by: Ben Segall <bsegall@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Ambrose Feinstein <ambrose@google.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'block')
| -rw-r--r-- | block/ioprio.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/block/ioprio.c b/block/ioprio.c index 31666c92b46a..cc7800e9eb44 100644 --- a/block/ioprio.c +++ b/block/ioprio.c @@ -123,7 +123,8 @@ SYSCALL_DEFINE3(ioprio_set, int, which, int, who, int, ioprio) break; do_each_thread(g, p) { - if (!uid_eq(task_uid(p), uid)) + if (!uid_eq(task_uid(p), uid) || + !task_pid_vnr(p)) continue; ret = set_task_ioprio(p, ioprio); if (ret) @@ -220,7 +221,8 @@ SYSCALL_DEFINE2(ioprio_get, int, which, int, who) break; do_each_thread(g, p) { - if (!uid_eq(task_uid(p), user->uid)) + if (!uid_eq(task_uid(p), user->uid) || + !task_pid_vnr(p)) continue; tmpio = get_task_ioprio(p); if (tmpio < 0) |