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Message-Id: <20240409140059.3806717-2-arnd@kernel.org>
Date: Tue, 9 Apr 2024 16:00:54 +0200
From: Arnd Bergmann <arnd@...nel.org>
To: linux-kbuild@...r.kernel.org
Cc: Arnd Bergmann <arnd@...db.de>,
"Richard Russon" <ldm@...tcap.org>,
Jens Axboe <axboe@...nel.dk>,
Robert Moore <robert.moore@...el.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
Len Brown <lenb@...nel.org>,
Steven Rostedt <rostedt@...dmis.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Masahiro Yamada <masahiroy@...nel.org>,
Nathan Chancellor <nathan@...nel.org>,
Nicolas Schier <nicolas@...sle.eu>,
Lin Ming <ming.m.lin@...el.com>,
Alexey Starikovskiy <astarikovskiy@...e.de>,
linux-ntfs-dev@...ts.sourceforge.net,
linux-block@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-acpi@...r.kernel.org,
acpica-devel@...ts.linux.dev,
linux-trace-kernel@...r.kernel.org,
Justin Stitt <justinstitt@...gle.com>
Subject: [PATCH 1/5] [v2] test_hexdump: avoid string truncation warning
From: Arnd Bergmann <arnd@...db.de>
gcc can warn when a string is too long to fit into the strncpy()
destination buffer, as it is here depending on the function
arguments:
inlined from 'test_hexdump_prepare_test.constprop' at /home/arnd/arm-soc/lib/test_hexdump.c:116:3:
include/linux/fortify-string.h:108:33: error: '__builtin_strncpy' output truncated copying between 0 and 32 bytes from a string of length 32 [-Werror=stringop-truncation]
108 | #define __underlying_strncpy __builtin_strncpy
| ^
include/linux/fortify-string.h:187:16: note: in expansion of macro '__underlying_strncpy'
187 | return __underlying_strncpy(p, q, size);
| ^~~~~~~~~~~~~~~~~~~~
The intention here is to copy exactly 'l' bytes without any padding or
NUL-termination, so the most logical change is to use memcpy(), just as
a previous change adapted the other output from strncpy() to memcpy().
Cc: Justin Stitt <justinstitt@...gle.com>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
---
lib/test_hexdump.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/test_hexdump.c b/lib/test_hexdump.c
index b916801f23a8..fe2682bb21e6 100644
--- a/lib/test_hexdump.c
+++ b/lib/test_hexdump.c
@@ -113,7 +113,7 @@ static void __init test_hexdump_prepare_test(size_t len, int rowsize,
*p++ = ' ';
} while (p < test + rs * 2 + rs / gs + 1);
- strncpy(p, data_a, l);
+ memcpy(p, data_a, l);
p += l;
}
--
2.39.2
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