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fs/proc/base.c: use ns_capable instead of capable for timerslack_ns

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Access to timerslack_ns is controlled by a process having CAP_SYS_NICE
in its effective capability set, but the current check looks in the root
namespace instead of the process' user namespace.  Since a process is
allowed to do other activities controlled by CAP_SYS_NICE inside a
namespace, it should also be able to adjust timerslack_ns.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Benjamin Gordon <[email protected]>
Acked-by: "Eric W. Biederman" <[email protected]>
Cc: John Stultz <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: "Serge E. Hallyn" <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Arjan van de Ven <[email protected]>
Cc: Oren Laadan <[email protected]>
Cc: Ruchi Kandoi <[email protected]>
Cc: Rom Lemarchand <[email protected]>
Cc: Todd Kjos <[email protected]>
Cc: Colin Cross <[email protected]>
Cc: Nick Kralevich <[email protected]>
Cc: Dmitry Shmidt <[email protected]>
Cc: Elliott Hughes <[email protected]>
Cc: Alexey Dobriyan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Benjamin Gordon 2019-01-03 15:25:56 -08:00 • committed by Linus Torvalds
commit 8da0b4f692
1 changed files with 9 additions and 3 deletions
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12
fs/proc/base.c
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@ -2356,10 +2356,13 @@ static ssize_t timerslack_ns_write(struct file *file, const char __user *buf,
return -ESRCH;
if (p != current) {
if (!capable(CAP_SYS_NICE)) {
rcu_read_lock();
if (!ns_capable(__task_cred(p)->user_ns, CAP_SYS_NICE)) {
rcu_read_unlock();
count = -EPERM;
goto out;
}
rcu_read_unlock();
err = security_task_setscheduler(p);
if (err) {
@ -2392,11 +2395,14 @@ static int timerslack_ns_show(struct seq_file *m, void *v)
return -ESRCH;
if (p != current) {
if (!capable(CAP_SYS_NICE)) {
rcu_read_lock();
if (!ns_capable(__task_cred(p)->user_ns, CAP_SYS_NICE)) {
rcu_read_unlock();
err = -EPERM;
goto out;
}
rcu_read_unlock();
err = security_task_getscheduler(p);
if (err)
goto out;