Commit c5febea0 authored by Eric W. Biederman's avatar Eric W. Biederman
Browse files

fork: Pass struct kernel_clone_args into copy_thread 

With io_uring we have started supporting tasks that are for most
purposes user space tasks that exclusively run code in kernel mode.

The kernel task that exec's init and tasks that exec user mode
helpers are also user mode tasks that just run kernel code
until they call kernel execve.

Pass kernel_clone_args into copy_thread so these oddball
tasks can be supported more cleanly and easily.

v2: Fix spelling of kenrel_clone_args on h8300
Link: https://lkml.kernel.org/r/20220506141512.516114-2-ebiederm@xmission.com


Signed-off-by: default avatar"Eric W. Biederman" <ebiederm@xmission.com>
parent 343f4c49

arch/alpha/kernel/process.c

+5 −3
Original line number Diff line number Diff line
@@ -233,10 +233,12 @@ release_thread(struct task_struct *dead_task) 
/*

 * Copy architecture-specific thread state

 */

int copy_thread(unsigned long clone_flags, unsigned long usp,

		unsigned long kthread_arg, struct task_struct *p,

		unsigned long tls)

int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)

{

	unsigned long clone_flags = args->flags;

	unsigned long usp = args->stack;

	unsigned long kthread_arg = args->stack_size;

	unsigned long tls = args->tls;

	extern void ret_from_fork(void);

	extern void ret_from_kernel_thread(void);

arch/arc/kernel/process.c

+5 −3
Original line number Diff line number Diff line
@@ -162,10 +162,12 @@ asmlinkage void ret_from_fork(void); 
 * |    user_r25    |

 * ------------------  <===== END of PAGE

 */

int copy_thread(unsigned long clone_flags, unsigned long usp,

		unsigned long kthread_arg, struct task_struct *p,

		unsigned long tls)

int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)

{

	unsigned long clone_flags = args->flags;

	unsigned long usp = args->stack;

	unsigned long kthread_arg = args->stack_size;

	unsigned long tls = args->tls;

	struct pt_regs *c_regs;        /* child's pt_regs */

	unsigned long *childksp;       /* to unwind out of __switch_to() */

	struct callee_regs *c_callee;  /* child's callee regs */

arch/arm/kernel/process.c

+5 −2
Original line number Diff line number Diff line
@@ -238,9 +238,12 @@ void release_thread(struct task_struct *dead_task) 


asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");



int copy_thread(unsigned long clone_flags, unsigned long stack_start,

		unsigned long stk_sz, struct task_struct *p, unsigned long tls)

int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)

{

	unsigned long clone_flags = args->flags;

	unsigned long stack_start = args->stack;

	unsigned long stk_sz = args->stack_size;

	unsigned long tls = args->tls;

	struct thread_info *thread = task_thread_info(p);

	struct pt_regs *childregs = task_pt_regs(p);

arch/arm64/kernel/process.c

+5 −2
Original line number Diff line number Diff line
@@ -316,9 +316,12 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) 


asmlinkage void ret_from_fork(void) asm("ret_from_fork");



int copy_thread(unsigned long clone_flags, unsigned long stack_start,

		unsigned long stk_sz, struct task_struct *p, unsigned long tls)

int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)

{

	unsigned long clone_flags = args->flags;

	unsigned long stack_start = args->stack;

	unsigned long stk_sz = args->stack_size;

	unsigned long tls = args->tls;

	struct pt_regs *childregs = task_pt_regs(p);



	memset(&p->thread.cpu_context, 0, sizeof(struct cpu_context));

arch/csky/kernel/process.c

+5 −5
Original line number Diff line number Diff line
@@ -30,12 +30,12 @@ asmlinkage void ret_from_kernel_thread(void); 
 */

void flush_thread(void){}



int copy_thread(unsigned long clone_flags,

		unsigned long usp,

		unsigned long kthread_arg,

		struct task_struct *p,

		unsigned long tls)

int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)

{

	unsigned long clone_flags = args->flags;

	unsigned long usp = args->stack;

	unsigned long kthread_arg = args->stack_size;

	unsigned long tls = args->tls;

	struct switch_stack *childstack;

	struct pt_regs *childregs = task_pt_regs(p);