linux-kernel - [PATCH] LoongArch: Increase COMMAND_LINE

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>] [day] [month] [year] [list]

Message-ID: <20250812122043.2462836-1-wangming01@loongson.cn>
Date: Tue, 12 Aug 2025 20:20:43 +0800
From: Ming Wang <wangming01@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>,
	WANG Xuerui <kernel@...0n.name>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Alexandre Ghiti <alex@...ti.fr>,
	Ming Wang <wangming01@...ngson.cn>,
	loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org
Cc: lixuefeng@...ngson.cn,
	chenhuacai@...ngson.cn,
	Huang Cun <cunhuang@...cent.com>
Subject: [PATCH] LoongArch: Increase COMMAND_LINE_SIZE to 4096

The default COMMAND_LINE_SIZE of 512, inherited from asm-generic, is
too small for modern use cases. For example, kdump configurations or
extensive debugging parameters can easily exceed this limit.

Therefore, increase the command line size to 4096 bytes, aligning
LoongArch with the MIPS architecture. This change follows a broader
trend among architectures to raise this limit to support modern needs;
for instance, PowerPC increased its value for similar reasons in
commit a5980d064fe2 ("powerpc: Bump COMMAND_LINE_SIZE to 2048").

Similar to the change made for RISC-V in commit 61fc1ee8be26
("riscv: Bump COMMAND_LINE_SIZE value to 1024"), this is considered
a safe change. The broader kernel community has reached a consensus
that modifying COMMAND_LINE_SIZE from UAPI headers does not
constitute a uABI breakage, as well-behaved userspace applications
should not rely on this macro.

Suggested-by: Huang Cun <cunhuang@...cent.com>
Signed-off-by: Ming Wang <wangming01@...ngson.cn>
---
 arch/loongarch/include/uapi/asm/setup.h | 8 ++++++++
 1 file changed, 8 insertions(+)
 create mode 100644 arch/loongarch/include/uapi/asm/setup.h

diff --git a/arch/loongarch/include/uapi/asm/setup.h b/arch/loongarch/include/uapi/asm/setup.h
new file mode 100644
index 000000000000..d46363ce3e02
--- /dev/null
+++ b/arch/loongarch/include/uapi/asm/setup.h
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+
+#ifndef _UAPI_ASM_LOONGARCH_SETUP_H
+#define _UAPI_ASM_LOONGARCH_SETUP_H
+
+#define COMMAND_LINE_SIZE	4096
+
+#endif /* _UAPI_ASM_LOONGARCH_SETUP_H */
-- 
2.43.0