For fine-grained debugging and usercopy protection.

Signed-off-by: Alexey Dobriyan <adobri...@gmail.com>
---

 fs/seq_file.c            |   12 ++++++++++--
 include/linux/seq_file.h |    1 +
 init/main.c              |    1 +
 3 files changed, 12 insertions(+), 2 deletions(-)

--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -6,6 +6,7 @@
  * initial implementation -- AV, Oct 2001.
  */
 
+#include <linux/cache.h>
 #include <linux/fs.h>
 #include <linux/export.h>
 #include <linux/seq_file.h>
@@ -19,6 +20,8 @@
 #include <linux/uaccess.h>
 #include <asm/page.h>
 
+static struct kmem_cache *seq_file_cache __ro_after_init;
+
 static void seq_set_overflow(struct seq_file *m)
 {
        m->count = m->size;
@@ -51,7 +54,7 @@ int seq_open(struct file *file, const struct seq_operations 
*op)
 
        WARN_ON(file->private_data);
 
-       p = kzalloc(sizeof(*p), GFP_KERNEL);
+       p = kmem_cache_zalloc(seq_file_cache, GFP_KERNEL);
        if (!p)
                return -ENOMEM;
 
@@ -366,7 +369,7 @@ int seq_release(struct inode *inode, struct file *file)
 {
        struct seq_file *m = file->private_data;
        kvfree(m->buf);
-       kfree(m);
+       kmem_cache_free(seq_file_cache, m);
        return 0;
 }
 EXPORT_SYMBOL(seq_release);
@@ -1106,3 +1109,8 @@ seq_hlist_next_percpu(void *v, struct hlist_head __percpu 
*head,
        return NULL;
 }
 EXPORT_SYMBOL(seq_hlist_next_percpu);
+
+void __init seq_file_init(void)
+{
+       seq_file_cache = KMEM_CACHE(seq_file, SLAB_PANIC);
+}
--- a/include/linux/seq_file.h
+++ b/include/linux/seq_file.h
@@ -240,4 +240,5 @@ extern struct hlist_node *seq_hlist_start_percpu(struct 
hlist_head __percpu *hea
 
 extern struct hlist_node *seq_hlist_next_percpu(void *v, struct hlist_head 
__percpu *head, int *cpu, loff_t *pos);
 
+void seq_file_init(void);
 #endif
--- a/init/main.c
+++ b/init/main.c
@@ -696,6 +696,7 @@ asmlinkage __visible void __init start_kernel(void)
        vfs_caches_init();
        pagecache_init();
        signals_init();
+       seq_file_init();
        proc_root_init();
        nsfs_init();
        cpuset_init();

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