linux-hardening - [PATCH] kheaders: Use array declaration instead of char

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-Id: <20230302224946.never.243-kees@kernel.org>
Date:   Thu,  2 Mar 2023 14:49:50 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Joel Fernandes <joel@...lfernandes.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Jakub Kicinski <kuba@...nel.org>, stable@...r.kernel.org,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: [PATCH] kheaders: Use array declaration instead of char

Under CONFIG_FORTIFY_SOURCE, memcpy() will check the size of destination
and source buffers. Defining kernel_headers_data as "char" would trip
this check. Since these addresses are treated as byte arrays, define
them as arrays (as done everywhere else).

This was seen with:

  $ cat /sys/kernel/kheaders.tar.xz >> /dev/null

  detected buffer overflow in memcpy
  kernel BUG at lib/string_helpers.c:1027!
  ...
  RIP: 0010:fortify_panic+0xf/0x20
  [...]
  Call Trace:
   <TASK>
   ikheaders_read+0x45/0x50 [kheaders]
   kernfs_fop_read_iter+0x1a4/0x2f0
  ...

Reported-by: Jakub Kicinski <kuba@...nel.org>
Link: https://lore.kernel.org/bpf/20230302112130.6e402a98@kernel.org/
Tested-by: Jakub Kicinski <kuba@...nel.org>
Fixes: 43d8ce9d65a5 ("Provide in-kernel headers to make extending kernel easier")
Cc: Joel Fernandes (Google) <joel@...lfernandes.org>
Cc: stable@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 kernel/kheaders.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/kheaders.c b/kernel/kheaders.c
index 8f69772af77b..42163c9e94e5 100644
--- a/kernel/kheaders.c
+++ b/kernel/kheaders.c
@@ -26,15 +26,15 @@ asm (
 "	.popsection				\n"
 );
 
-extern char kernel_headers_data;
-extern char kernel_headers_data_end;
+extern char kernel_headers_data[];
+extern char kernel_headers_data_end[];
 
 static ssize_t
 ikheaders_read(struct file *file,  struct kobject *kobj,
 	       struct bin_attribute *bin_attr,
 	       char *buf, loff_t off, size_t len)
 {
-	memcpy(buf, &kernel_headers_data + off, len);
+	memcpy(buf, &kernel_headers_data[off], len);
 	return len;
 }
 
@@ -48,8 +48,8 @@ static struct bin_attribute kheaders_attr __ro_after_init = {
 
 static int __init ikheaders_init(void)
 {
-	kheaders_attr.size = (&kernel_headers_data_end -
-			      &kernel_headers_data);
+	kheaders_attr.size = (kernel_headers_data_end -
+			      kernel_headers_data);
 	return sysfs_create_bin_file(kernel_kobj, &kheaders_attr);
 }
 
-- 
2.34.1