linux-hardening - [PATCH] scripts/dtc: Replace 0-length arrays with flexible arrays

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]

Date:   Fri, 27 Jan 2023 14:41:02 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Frank Rowand <frowand.list@...il.com>,
        devicetree@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: [PATCH] scripts/dtc: Replace 0-length arrays with flexible arrays

Replace the 0-length array with a C99 flexible array. Seen with GCC 13
under -fstrict-flex-arrays:

In file included from ../lib/fdt_ro.c:2:
../lib/../scripts/dtc/libfdt/fdt_ro.c: In function 'fdt_get_name':
../lib/../scripts/dtc/libfdt/fdt_ro.c:319:24: warning: 'strrchr' reading 1 or more bytes from a region of size 0 [-Wstringop-overread]
  319 |                 leaf = strrchr(nameptr, '/');
      |                        ^~~~~~~~~~~~~~~~~~~~~

Cc: Rob Herring <robh+dt@...nel.org>
Cc: Frank Rowand <frowand.list@...il.com>
Cc: devicetree@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 scripts/dtc/libfdt/fdt.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/scripts/dtc/libfdt/fdt.h b/scripts/dtc/libfdt/fdt.h
index f2e68807f277..0c91aa7f67b5 100644
--- a/scripts/dtc/libfdt/fdt.h
+++ b/scripts/dtc/libfdt/fdt.h
@@ -35,14 +35,14 @@ struct fdt_reserve_entry {
 
 struct fdt_node_header {
 	fdt32_t tag;
-	char name[0];
+	char name[];
 };
 
 struct fdt_property {
 	fdt32_t tag;
 	fdt32_t len;
 	fdt32_t nameoff;
-	char data[0];
+	char data[];
 };
 
 #endif /* !__ASSEMBLY */
-- 
2.34.1