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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: Gregory Price <gregory.price@memverge.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Link: https://lore.kernel.org/r/20230407171834.3558-2-gregory.price@memverge.com
This commit is contained in:
Gregory Price 2023-04-07 13:18:31 -04:00 committed by Thomas Gleixner
parent 09a9639e56
commit 4336068632
1 changed files with 15 additions and 8 deletions
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23
kernel/entry/syscall_user_dispatch.c
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@ -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);
}