Disabled due to https:/github.com/dynup/kpatch/issues/940

---

diff -Nupr src/fs/proc/array.c src/fs/proc/array.c

--- src/fs/proc/array.c	2020-03-11 11:23:26.874602392 +0000

+++ src/fs/proc/array.c	2020-03-11 11:48:34.514964309 +0000

@@ -370,12 +370,19 @@ static inline void task_seccomp(struct s

 	seq_putc(m, '\n');

 }

+#include <linux/livepatch.h>

 static inline void task_context_switch_counts(struct seq_file *m,

 						struct task_struct *p)

 {

+	int *newpid;

+

 	seq_put_decimal_ull(m, "voluntary_ctxt_switches:\t", p->nvcsw);

 	seq_put_decimal_ull(m, "\nnonvoluntary_ctxt_switches:\t", p->nivcsw);

 	seq_putc(m, '\n');

+

+	newpid = klp_shadow_get(p, 0);

+	if (newpid)

+		seq_printf(m, "newpid:\t%d\n", *newpid);

 }

 static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)

diff -Nupr src/kernel/exit.c src/kernel/exit.c

--- src/kernel/exit.c	2020-03-11 11:23:30.434682812 +0000

+++ src/kernel/exit.c	2020-03-11 11:48:34.514964309 +0000

@@ -762,6 +762,7 @@ static void check_stack_usage(void)

 static inline void check_stack_usage(void) {}

 #endif

+#include <linux/livepatch.h>

 void __noreturn do_exit(long code)

 {

 	struct task_struct *tsk = current;

@@ -868,6 +869,8 @@ void __noreturn do_exit(long code)

 	exit_thread(tsk);

 	exit_umh(tsk);

+	klp_shadow_free(tsk, 0, NULL);

+

 	/*

 	 * Flush inherited counters to the parent - before the parent

 	 * gets woken up by child-exit notifications.

diff -Nupr src/kernel/fork.c src/kernel/fork.c

--- src/kernel/fork.c	2020-03-11 11:23:30.438682903 +0000

+++ src/kernel/fork.c	2020-03-11 11:48:34.514964309 +0000

@@ -2210,6 +2210,7 @@ struct task_struct *fork_idle(int cpu)

  * It copies the process, and if successful kick-starts

  * it and waits for it to finish using the VM if required.

  */

+#include <linux/livepatch.h>

 long _do_fork(unsigned long clone_flags,

 	      unsigned long stack_start,

 	      unsigned long stack_size,

@@ -2222,6 +2223,8 @@ long _do_fork(unsigned long clone_flags,

 	struct task_struct *p;

 	int trace = 0;

 	long nr;

+	int *newpid;

+	static int ctr = 0;

 	/*

 	 * Determine whether and which event to report to ptracer.  When

@@ -2248,6 +2251,11 @@ long _do_fork(unsigned long clone_flags,

 	if (IS_ERR(p))

 		return PTR_ERR(p);

+	newpid = klp_shadow_get_or_alloc(p, 0, sizeof(*newpid), GFP_KERNEL,

+					 NULL, NULL);

+	if (newpid)

+		*newpid = ctr++;

+

 	/*

 	 * Do this prior waking up the new thread - the thread pointer

 	 * might get invalid after that point, if the thread exits quickly.