seq_file: allocate seq_file from kmem_cache
For fine-grained debugging and usercopy protection. Link: http://lkml.kernel.org/r/20180310085027.GA17121@avx2 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Glauber Costa <glommer@gmail.com> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -6,6 +6,7 @@
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* initial implementation -- AV, Oct 2001.
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*/
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#include <linux/cache.h>
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#include <linux/fs.h>
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#include <linux/export.h>
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#include <linux/seq_file.h>
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@ -19,6 +20,8 @@
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#include <linux/uaccess.h>
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#include <asm/page.h>
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static struct kmem_cache *seq_file_cache __ro_after_init;
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static void seq_set_overflow(struct seq_file *m)
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{
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m->count = m->size;
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@ -51,7 +54,7 @@ int seq_open(struct file *file, const struct seq_operations *op)
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WARN_ON(file->private_data);
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p = kzalloc(sizeof(*p), GFP_KERNEL);
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p = kmem_cache_zalloc(seq_file_cache, GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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@ -366,7 +369,7 @@ int seq_release(struct inode *inode, struct file *file)
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{
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struct seq_file *m = file->private_data;
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kvfree(m->buf);
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kfree(m);
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kmem_cache_free(seq_file_cache, m);
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return 0;
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}
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EXPORT_SYMBOL(seq_release);
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@ -1106,3 +1109,8 @@ seq_hlist_next_percpu(void *v, struct hlist_head __percpu *head,
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return NULL;
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}
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EXPORT_SYMBOL(seq_hlist_next_percpu);
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void __init seq_file_init(void)
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{
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seq_file_cache = KMEM_CACHE(seq_file, SLAB_PANIC);
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}
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@ -240,4 +240,5 @@ extern struct hlist_node *seq_hlist_start_percpu(struct hlist_head __percpu *hea
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extern struct hlist_node *seq_hlist_next_percpu(void *v, struct hlist_head __percpu *head, int *cpu, loff_t *pos);
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void seq_file_init(void);
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#endif
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@ -715,6 +715,7 @@ asmlinkage __visible void __init start_kernel(void)
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vfs_caches_init();
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pagecache_init();
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signals_init();
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seq_file_init();
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proc_root_init();
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nsfs_init();
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cpuset_init();
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