linux-kernel - [PATCH v2 2/7] kallsyms: Fix address-checks for kernel related range

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20210728081320.20394-3-wangkefeng.wang@huawei.com>
Date:   Wed, 28 Jul 2021 16:13:15 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     <arnd@...db.de>, <linux-arch@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>,
        <rostedt@...dmis.org>, <mingo@...hat.com>, <davem@...emloft.net>,
        <ast@...nel.org>, <ryabinin.a.a@...il.com>
CC:     <mpe@...erman.id.au>, <benh@...nel.crashing.org>,
        <paulus@...ba.org>, Kefeng Wang <wangkefeng.wang@...wei.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Petr Mladek <pmladek@...e.com>,
        "Sergey Senozhatsky" <senozhatsky@...omium.org>
Subject: [PATCH v2 2/7] 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, the issue exists since Linux v2.6.12.

Cc: Arnd Bergmann <arnd@...db.de>
Cc: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc: Petr Mladek <pmladek@...e.com>
Acked-by: Sergey Senozhatsky <senozhatsky@...omium.org>
Reviewed-by: Petr Mladek <pmladek@...e.com>
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 2a241e3f063f..b016c62f30a6 100644
--- a/include/linux/kallsyms.h
+++ b/include/linux/kallsyms.h
@@ -27,21 +27,21 @@ 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