Commit 43360686 authored by Gregory Price's avatar Gregory Price Committed by Thomas Gleixner
Browse files

syscall_user_dispatch: Split up set_syscall_user_dispatch() 



syscall user dispatch configuration is not covered by checkpoint/restore.

To prepare for ptrace access to the syscall user dispatch configuration,
move the inner working of set_syscall_user_dispatch() into a helper
function. Make the helper function task pointer based and let
set_syscall_user_dispatch() invoke it with task=current.

No functional change.

Signed-off-by: default avatarGregory Price <gregory.price@memverge.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Reviewed-by: default avatarOleg Nesterov <oleg@redhat.com>
Link: https://lore.kernel.org/r/20230407171834.3558-2-gregory.price@memverge.com
parent 09a9639e

kernel/entry/syscall_user_dispatch.c

+15 −8
Original line number Diff line number Diff line
@@ -68,8 +68,9 @@ bool syscall_user_dispatch(struct pt_regs *regs) 
	return true;

}



int set_syscall_user_dispatch(unsigned long mode, unsigned long offset,

			      unsigned long len, char __user *selector)

static int task_set_syscall_user_dispatch(struct task_struct *task, unsigned long mode,

					  unsigned long offset, unsigned long len,

					  char __user *selector)

{

	switch (mode) {

	case PR_SYS_DISPATCH_OFF:
@@ -94,15 +95,21 @@ int set_syscall_user_dispatch(unsigned long mode, unsigned long offset, 
		return -EINVAL;

	}



	current->syscall_dispatch.selector = selector;

	current->syscall_dispatch.offset = offset;

	current->syscall_dispatch.len = len;

	current->syscall_dispatch.on_dispatch = false;

	task->syscall_dispatch.selector = selector;

	task->syscall_dispatch.offset = offset;

	task->syscall_dispatch.len = len;

	task->syscall_dispatch.on_dispatch = false;



	if (mode == PR_SYS_DISPATCH_ON)

		set_syscall_work(SYSCALL_USER_DISPATCH);

		set_task_syscall_work(task, SYSCALL_USER_DISPATCH);

	else

		clear_syscall_work(SYSCALL_USER_DISPATCH);

		clear_task_syscall_work(task, SYSCALL_USER_DISPATCH);



	return 0;

}



int set_syscall_user_dispatch(unsigned long mode, unsigned long offset,

			      unsigned long len, char __user *selector)

{

	return task_set_syscall_user_dispatch(current, mode, offset, len, selector);

}