linux-kernel - [PATCH] execve: argument list space enlargement

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Date: Wed,  3 Jan 2024 21:07:22 +0800
From: alexs@...nel.org
To: Eric Biederman <ebiederm@...ssion.com>,
	Kees Cook <keescook@...omium.org>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc: Alex Shi <alexsshi@...cent.com>,
	curlinhuang@...cent.com
Subject: [PATCH] execve: argument list space enlargement

From: Alex Shi <alexsshi@...cent.com>

Wechat using too long gcc parameters, then get a strace complain:
  execve(...) = -1 E2BIG (Argument list too long)
Have to increase the parameter space for this, stack has enough
space for this enlargement.

Signed-off-by: Alex Shi <alexsshi@...cent.com>
Cc: Alex Shi <alexsshi@...cent.com>
To: linux-kernel@...r.kernel.org
To: linux-mm@...ck.org
To: Kees Cook <keescook@...omium.org>
To: Eric Biederman <ebiederm@...ssion.com>
---
 include/uapi/linux/binfmts.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/uapi/linux/binfmts.h b/include/uapi/linux/binfmts.h
index c6f9450efc12..717f6cafe8dd 100644
--- a/include/uapi/linux/binfmts.h
+++ b/include/uapi/linux/binfmts.h
@@ -12,7 +12,7 @@ struct pt_regs;
  * prevent the kernel from being unduly impacted by misaddressed pointers.
  * MAX_ARG_STRINGS is chosen to fit in a signed 32-bit integer.
  */
-#define MAX_ARG_STRLEN (PAGE_SIZE * 32)
+#define MAX_ARG_STRLEN (PAGE_SIZE * 128)
 #define MAX_ARG_STRINGS 0x7FFFFFFF
 
 /* sizeof(linux_binprm->buf) */
-- 
2.43.0