linux-kernel - [PATCH 2/9] kallsyms: Fix address-checks for kernel related range

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Date:   Sat, 26 Jun 2021 15:34:32 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Arnd Bergmann <arnd@...db.de>, <linux-arch@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     Kefeng Wang <wangkefeng.wang@...wei.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Petr Mladek <pmladek@...e.com>
Subject: [PATCH 2/9] kallsyms: Fix address-checks for kernel related range

The is_kernel_inittext/is_kernel_text/is_kernel function should not
include the end address(the labels _einittext, _etext and _end) when
check the address range.

Cc: Arnd Bergmann <arnd@...db.de>
Cc: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc: Petr Mladek <pmladek@...e.com>
Fixes: 04b8eb7a4ccd ("symbol lookup: introduce dereference_symbol_descriptor()")
Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 include/linux/kallsyms.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/kallsyms.h b/include/linux/kallsyms.h
index d773732cc8eb..c44c26977805 100644
--- a/include/linux/kallsyms.h
+++ b/include/linux/kallsyms.h
@@ -26,21 +26,21 @@ struct module;
 static inline int is_kernel_inittext(unsigned long addr)
 {
 	if (addr >= (unsigned long)_sinittext
-	    && addr <= (unsigned long)_einittext)
+	    && addr < (unsigned long)_einittext)
 		return 1;
 	return 0;
 }
 
 static inline int is_kernel_text(unsigned long addr)
 {
-	if ((addr >= (unsigned long)_stext && addr <= (unsigned long)_etext))
+	if ((addr >= (unsigned long)_stext && addr < (unsigned long)_etext))
 		return 1;
 	return in_gate_area_no_mm(addr);
 }
 
 static inline int is_kernel(unsigned long addr)
 {
-	if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end)
+	if (addr >= (unsigned long)_stext && addr < (unsigned long)_end)
 		return 1;
 	return in_gate_area_no_mm(addr);
 }
-- 
2.26.2