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Revert "cgroup/cpuset: Prevent UAF in proc_cpuset_show()"

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This reverts commit 106a2662b1.
This commit is contained in:
Ksawlii 2024-11-24 00:23:50 +01:00
parent 6ab3af7f42
commit 9947944ca2
1 changed files with 4 additions and 9 deletions
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13
kernel/cgroup/cpuset.c
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@ -22,7 +22,6 @@
* distribution for more details. * distribution for more details.
*/ */
#include "cgroup-internal.h"
#include <linux/cpu.h> #include <linux/cpu.h>
#include <linux/cpumask.h> #include <linux/cpumask.h>
#include <linux/cpuset.h> #include <linux/cpuset.h>
@ -3780,14 +3779,10 @@ int proc_cpuset_show(struct seq_file *m, struct pid_namespace *ns,
if (!buf) if (!buf)
goto out; goto out;
rcu_read_lock(); css = task_get_css(tsk, cpuset_cgrp_id);
spin_lock_irq(&css_set_lock); retval = cgroup_path_ns(css->cgroup, buf, PATH_MAX,
css = task_css(tsk, cpuset_cgrp_id); current->nsproxy->cgroup_ns);
retval = cgroup_path_ns_locked(css->cgroup, buf, PATH_MAX, css_put(css);
current->nsproxy->cgroup_ns);
spin_unlock_irq(&css_set_lock);
rcu_read_unlock();
if (retval >= PATH_MAX) if (retval >= PATH_MAX)
retval = -ENAMETOOLONG; retval = -ENAMETOOLONG;
if (retval < 0) if (retval < 0)