linux-kernel - [PATCH 2/5] [v2] acpi: disable -Wstringop-truncation

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Date: Tue,  9 Apr 2024 16:00:55 +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
Subject: [PATCH 2/5] [v2] acpi: disable -Wstringop-truncation

From: Arnd Bergmann <arnd@...db.de>

gcc -Wstringop-truncation warns about copying a string that results in a
missing nul termination:

drivers/acpi/acpica/tbfind.c: In function 'acpi_tb_find_table':
drivers/acpi/acpica/tbfind.c:60:9: error: 'strncpy' specified bound 6 equals destination size [-Werror=stringop-truncation]
   60 |         strncpy(header.oem_id, oem_id, ACPI_OEM_ID_SIZE);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/acpi/acpica/tbfind.c:61:9: error: 'strncpy' specified bound 8 equals destination size [-Werror=stringop-truncation]
   61 |         strncpy(header.oem_table_id, oem_table_id, ACPI_OEM_TABLE_ID_SIZE);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The code works as intended, and the warning could be addressed by using
a memcpy(), but turning the warning off for this file works equally well
and may be easir to merge.

Fixes: 47c08729bf1c ("ACPICA: Fix for LoadTable operator, input strings")
Link: https://lore.kernel.org/lkml/CAJZ5v0hoUfv54KW7y4223Mn9E7D4xvR7whRFNLTBqCZMUxT50Q@mail.gmail.com/#t
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/acpi/acpica/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/acpi/acpica/Makefile b/drivers/acpi/acpica/Makefile
index 30f3fc13c29d..8d18af396de9 100644
--- a/drivers/acpi/acpica/Makefile
+++ b/drivers/acpi/acpica/Makefile
@@ -5,6 +5,7 @@
 
 ccflags-y			:= -D_LINUX -DBUILDING_ACPICA
 ccflags-$(CONFIG_ACPI_DEBUG)	+= -DACPI_DEBUG_OUTPUT
+CFLAGS_tbfind.o 		+= $(call cc-disable-warning, stringop-truncation)
 
 # use acpi.o to put all files here into acpi.o modparam namespace
 obj-y	+= acpi.o
-- 
2.39.2