kernel: synchronize with the latest 'scope-minimized manual hooks'

-v1.5
__backslashxx/KernelSU#5
____kernel_compat: remove cond. check against ksu_access_ok in ksu_copy_from_user_retry; remove comment

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Description addendum:
kernel: ksud: migrate ksud execution to security_bprm_check (tiann/KernelSU#2653)
backslashxx/KernelSU@1e5994d

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References:
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- old version2 backslashxx/KernelSU@37d5938
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This now provides a small helper function, ksu_copy_from_user_retry, which explains
itself. First we attempt a _nofault copy, if that fails, we try plain.

While using strncpy_from_user_nofault was considered, this wont do, this will
only copy up to the first \0.

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Stale: tiann/KernelSU#2653

Signed-off-by: backslashxx <[email protected]>

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-https://gitlab.com/pershoot/susfs4ksu/-/tree/gki-android14-6.1-dev

Author: pershoot

kernel/kernel_compat.h

@@ -50,15 +50,11 @@ __attribute__((hot))
 static long ksu_copy_from_user_retry(void *to,
 		const void __user *from, unsigned long count)
 {
-	// _nofault does access_ok by itself already
 	long ret = ksu_copy_from_user_nofault(to, from, count);
 	if (likely(!ret))
 		return ret;
 
 	// we faulted! fallback to slow path
-	if (unlikely(!ksu_access_ok(from, count)))
-		return -EFAULT;
-
 	return copy_from_user(to, from, count);
 }