From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/lib/strnlen_user.c | 12 +++---------
1 files changed, 3 insertions(+), 9 deletions(-)
diff --git a/kernel/lib/strnlen_user.c b/kernel/lib/strnlen_user.c
index 37628e7..1616710 100644
--- a/kernel/lib/strnlen_user.c
+++ b/kernel/lib/strnlen_user.c
@@ -3,15 +3,9 @@
#include <linux/export.h>
#include <linux/uaccess.h>
#include <linux/mm.h>
+#include <linux/bitops.h>
#include <asm/word-at-a-time.h>
-
-/* Set bits in the first 'n' bytes when loaded from memory */
-#ifdef __LITTLE_ENDIAN
-# define aligned_byte_mask(n) ((1ul << 8*(n))-1)
-#else
-# define aligned_byte_mask(n) (~0xfful << (BITS_PER_LONG - 8 - 8*(n)))
-#endif
/*
* Do a strnlen, return length of string *with* final '\0'.
@@ -115,9 +109,9 @@
if (max > count)
max = count;
- if (user_access_begin(VERIFY_READ, str, max)) {
+ if (user_read_access_begin(str, max)) {
retval = do_strnlen_user(str, count, max);
- user_access_end();
+ user_read_access_end();
return retval;
}
}
--
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