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Merge "proc: prevent stacking filesystems on top"

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Linux Build Service Account 2016-09-30 18:23:28 -07:00 • committed by Gerrit - the friendly Code Review server
commit 187b791db4
1 changed files with 7 additions and 0 deletions
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7
fs/proc/root.c
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@ -121,6 +121,13 @@ static struct dentry *proc_mount(struct file_system_type *fs_type,
if (IS_ERR(sb))
return ERR_CAST(sb);
/*
* procfs isn't actually a stacking filesystem; however, there is
* too much magic going on inside it to permit stacking things on
* top of it
*/
sb->s_stack_depth = FILESYSTEM_MAX_STACK_DEPTH;
if (!proc_parse_options(options, ns)) {
deactivate_locked_super(sb);
return ERR_PTR(-EINVAL);