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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/include/linux/pid_namespace.h
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@@ -12,14 +12,10 @@
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 #include <linux/ns_common.h>
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 #include <linux/idr.h>
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+/* MAX_PID_NS_LEVEL is needed for limiting size of 'struct pid' */
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+#define MAX_PID_NS_LEVEL 32
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 struct fs_pin;
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-
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-enum { /* definitions for pid_namespace's hide_pid field */
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-	HIDEPID_OFF	  = 0,
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-	HIDEPID_NO_ACCESS = 1,
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-	HIDEPID_INVISIBLE = 2,
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-};
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 struct pid_namespace {
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 	struct kref kref;
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@@ -30,19 +26,11 @@
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 	struct kmem_cache *pid_cachep;
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 	unsigned int level;
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 	struct pid_namespace *parent;
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-#ifdef CONFIG_PROC_FS
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-	struct vfsmount *proc_mnt;
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-	struct dentry *proc_self;
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-	struct dentry *proc_thread_self;
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-#endif
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 #ifdef CONFIG_BSD_PROCESS_ACCT
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 	struct fs_pin *bacct;
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 #endif
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 	struct user_namespace *user_ns;
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 	struct ucounts *ucounts;
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-	struct work_struct proc_work;
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-	kgid_t pid_gid;
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-	int hide_pid;
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 	int reboot;	/* group exit code if this pidns was rebooted */
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 	struct ns_common ns;
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 } __randomize_layout;