The commit is pushed to "branch-rh9-5.14.0-162.18.1.vz9.19.x-ovz" and will
appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh9-5.14.0-162.18.1.vz9.19.6
------>
commit c3d4818f7955e20ba582e07f1e8c43b888f963fc
Author: Konstantin Khorenko <khore...@virtuozzo.com>
Date: Thu Apr 20 16:16:37 2023 +0300
Revert "mm/memflags/procfs: Allow userspace to set kernel memory allocation
flags"
This reverts commit 55d2e8ecb5d7b26b5bb8056f60c1ee99ae68a654.
We will add same functionality but via prctl interface.
https://jira.vzint.dev/browse/PSBM-141577
Signed-off-by: Konstantin Khorenko <khore...@virtuozzo.com>
---
fs/proc/base.c | 77 ----------------------------------------------------------
1 file changed, 77 deletions(-)
diff --git a/fs/proc/base.c b/fs/proc/base.c
index a2b4f09aaa56..0b900343aef6 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1360,81 +1360,6 @@ static const struct file_operations
proc_oom_score_adj_operations = {
.llseek = default_llseek,
};
-#define MEMALLOC_FLAGS_MASK (PF_MEMALLOC | PF_MEMALLOC_NOFS | \
- PF_MEMALLOC_NOIO | PF_MEMALLOC_PIN)
-
-static ssize_t memalloc_flags_read(struct file *file, char __user *buf,
- size_t count, loff_t *ppos)
-{
- struct task_struct *task = get_proc_task(file_inode(file));
- char buffer[PROC_NUMBUF];
- unsigned int pflags;
- size_t len;
-
- if (!task)
- return -ESRCH;
-
- pflags = READ_ONCE(task->flags) & MEMALLOC_FLAGS_MASK;
- put_task_struct(task);
- len = snprintf(buffer, sizeof(buffer), "%u\n", pflags);
- return simple_read_from_buffer(buf, count, ppos, buffer, len);
-}
-
-static ssize_t memalloc_flags_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- struct task_struct *task = get_proc_task(file_inode(file));
- char buffer[PROC_NUMBUF] = {0};
- int memalloc_flags;
- int err = -ESRCH;
- unsigned int pflags;
-
- if (!task)
- goto out;
-
- if (!ve_is_super(get_exec_env())) {
- err = -EPERM;
- goto out;
- }
- /*
- * Potential issue here if task != current
- * concurrent setting of flags need synchronization
- * but currently flags are expected to change only from
- * current process so there is none.
- */
- if (task != current) {
- err = -EINVAL;
- goto out;
- }
-
- count = min(count, sizeof(buffer) -1);
- if (copy_from_user(buffer, buf, count)) {
- err = -EFAULT;
- goto out;
- }
-
- err = kstrtoint(strstrip(buffer), 0, &memalloc_flags);
- if (err)
- goto out;
- if (memalloc_flags & ~MEMALLOC_FLAGS_MASK) {
- err = -EINVAL;
- goto out;
- }
-
- pflags = READ_ONCE(task->flags) & ~MEMALLOC_FLAGS_MASK;
- WRITE_ONCE(task->flags, pflags | memalloc_flags);
-out:
- if (task)
- put_task_struct(task);
- return err < 0 ? err : count;
-}
-
-static const struct file_operations proc_memalloc_flags_operations = {
- .read = memalloc_flags_read,
- .write = memalloc_flags_write,
- .llseek = default_llseek,
-};
-
#ifdef CONFIG_AUDIT
#define TMPBUFLEN 11
static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
@@ -3475,7 +3400,6 @@ static const struct pid_entry tgid_base_stuff[] = {
ONE("oom_score", S_IRUGO, proc_oom_score),
REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations),
REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
- REG("memalloc_flags", S_IRUGO|S_IWUSR, proc_memalloc_flags_operations),
#ifdef CONFIG_AUDIT
REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
REG("sessionid", S_IRUGO, proc_sessionid_operations),
@@ -3825,7 +3749,6 @@ static const struct pid_entry tid_base_stuff[] = {
ONE("oom_score", S_IRUGO, proc_oom_score),
REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations),
REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
- REG("memalloc_flags", S_IRUGO|S_IWUSR, proc_memalloc_flags_operations),
#ifdef CONFIG_AUDIT
REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
REG("sessionid", S_IRUGO, proc_sessionid_operations),
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