Revert "mm: oom_kill: reap memory of a task that receives SIGKILL"
This reverts commit 97bf2fb571
.
Reason to revert: The changes introduced in this commit are
causing an undesirable SELinux denial as a side-effect and
we do not enable the functionality that this commit adds.
Reverting the commit fixes the SELinux denial bug.
Bug: 152624411
Test: boot
Signed-off-by: Martin Liu <liumartin@google.com>
Change-Id: I149b66e6fa0e90e691436e1a83261ff1de233669
Signed-off-by: UtsavBalar1231 <utsavbalar1231@gmail.com>
This commit is contained in:
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@ -51,7 +51,6 @@ Currently, these files are in /proc/sys/vm:
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- nr_trim_pages (only if CONFIG_MMU=n)
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- numa_zonelist_order
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- oom_dump_tasks
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- reap_mem_on_sigkill
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- oom_kill_allocating_task
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- overcommit_kbytes
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- overcommit_memory
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@ -656,24 +655,6 @@ The default value is 1 (enabled).
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==============================================================
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reap_mem_on_sigkill
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This enables or disables the memory reaping for a SIGKILL received
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process and that the sending process must have the CAP_KILL capabilities.
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If this is set to 1, when a process receives SIGKILL from a process
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that has the capability, CAP_KILL, the process is added into the oom_reaper
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queue which can be picked up by the oom_reaper thread to reap the memory of
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that process. This reaps for the process which received SIGKILL through
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either sys_kill from user or kill_pid from kernel.
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If this is set to 0, we are not reaping memory of a SIGKILL, sent through
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either sys_kill from user or kill_pid from kernel, received process.
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The default value is 0 (disabled).
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==============================================================
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oom_kill_allocating_task
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This enables or disables killing the OOM-triggering task in
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@ -120,8 +120,4 @@ extern void dump_tasks(struct mem_cgroup *memcg,
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extern int sysctl_oom_dump_tasks;
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extern int sysctl_oom_kill_allocating_task;
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extern int sysctl_panic_on_oom;
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extern int sysctl_reap_mem_on_sigkill;
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/* calls for LMK reaper */
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extern void add_to_oom_reaper(struct task_struct *p);
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#endif /* _INCLUDE_LINUX_OOM_H */
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@ -43,8 +43,6 @@
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#include <linux/compiler.h>
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#include <linux/posix-timers.h>
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#include <linux/livepatch.h>
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#include <linux/oom.h>
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#include <linux/capability.h>
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#include <linux/cgroup.h>
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#define CREATE_TRACE_POINTS
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@ -1387,11 +1385,8 @@ int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p,
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ret = check_kill_permission(sig, info, p);
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rcu_read_unlock();
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if (!ret && sig) {
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if (!ret && sig)
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ret = do_send_sig_info(sig, info, p, type);
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if (capable(CAP_KILL) && sig == SIGKILL)
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add_to_oom_reaper(p);
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}
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return ret;
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}
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@ -1663,13 +1663,6 @@ static struct ctl_table vm_table[] = {
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "reap_mem_on_sigkill",
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.data = &sysctl_reap_mem_on_sigkill,
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.maxlen = sizeof(sysctl_reap_mem_on_sigkill),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "overcommit_ratio",
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.data = &sysctl_overcommit_ratio,
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@ -54,7 +54,6 @@
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int sysctl_panic_on_oom;
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int sysctl_oom_kill_allocating_task;
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int sysctl_oom_dump_tasks = 1;
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int sysctl_reap_mem_on_sigkill;
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/*
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* Serializes oom killer invocations (out_of_memory()) from all contexts to
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@ -642,21 +641,13 @@ static int oom_reaper(void *unused)
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static void wake_oom_reaper(struct task_struct *tsk)
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{
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/*
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* Move the lock here to avoid scenario of queuing
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* the same task by both OOM killer and any other SIGKILL
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* path.
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*/
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spin_lock(&oom_reaper_lock);
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/* mm is already queued? */
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if (test_and_set_bit(MMF_OOM_REAP_QUEUED, &tsk->signal->oom_mm->flags)) {
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spin_unlock(&oom_reaper_lock);
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if (test_and_set_bit(MMF_OOM_REAP_QUEUED, &tsk->signal->oom_mm->flags))
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return;
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}
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get_task_struct(tsk);
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spin_lock(&oom_reaper_lock);
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tsk->oom_reaper_list = oom_reaper_list;
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oom_reaper_list = tsk;
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spin_unlock(&oom_reaper_lock);
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@ -676,16 +667,6 @@ static inline void wake_oom_reaper(struct task_struct *tsk)
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}
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#endif /* CONFIG_MMU */
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static void __mark_oom_victim(struct task_struct *tsk)
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{
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struct mm_struct *mm = tsk->mm;
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if (!cmpxchg(&tsk->signal->oom_mm, NULL, mm)) {
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mmgrab(tsk->signal->oom_mm);
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set_bit(MMF_OOM_VICTIM, &mm->flags);
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}
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}
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/**
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* mark_oom_victim - mark the given task as OOM victim
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* @tsk: task to mark
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@ -698,13 +679,18 @@ static void __mark_oom_victim(struct task_struct *tsk)
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*/
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static void mark_oom_victim(struct task_struct *tsk)
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{
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struct mm_struct *mm = tsk->mm;
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WARN_ON(oom_killer_disabled);
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/* OOM killer might race with memcg OOM */
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if (test_and_set_tsk_thread_flag(tsk, TIF_MEMDIE))
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return;
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/* oom_mm is bound to the signal struct life time. */
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__mark_oom_victim(tsk);
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if (!cmpxchg(&tsk->signal->oom_mm, NULL, mm)) {
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mmgrab(tsk->signal->oom_mm);
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set_bit(MMF_OOM_VICTIM, &mm->flags);
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}
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/*
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* Make sure that the task is woken up from uninterruptible sleep
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@ -1179,21 +1165,3 @@ void pagefault_out_of_memory(void)
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if (__ratelimit(&pfoom_rs))
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pr_warn("Huh VM_FAULT_OOM leaked out to the #PF handler. Retrying PF\n");
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}
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void add_to_oom_reaper(struct task_struct *p)
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{
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if (!sysctl_reap_mem_on_sigkill)
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return;
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p = find_lock_task_mm(p);
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if (!p)
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return;
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get_task_struct(p);
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if (task_will_free_mem(p)) {
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__mark_oom_victim(p);
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wake_oom_reaper(p);
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}
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task_unlock(p);
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put_task_struct(p);
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}
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