linux-kernel - [PATCH 1/2] um: Set secure access mode for temporary file

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Message-Id: <1448746350-19998-2-git-send-email-mic@digikod.net>
Date:	Sat, 28 Nov 2015 22:32:29 +0100
From:	Mickaël Salaün <mic@...ikod.net>
To:	linux-kernel@...r.kernel.org
Cc:	Mickaël Salaün <mic@...ikod.net>,
	Jeff Dike <jdike@...toit.com>,
	Richard Weinberger <richard@....at>,
	Tristan Schmelcher <tschmelcher@...gle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	user-mode-linux-devel@...ts.sourceforge.net,
	user-mode-linux-user@...ts.sourceforge.net
Subject: [PATCH 1/2] um: Set secure access mode for temporary file

Replace the default insecure mode 0777 with 0700 for temporary file.

Prohibit other users to change the executable mapped code.

Signed-off-by: Mickaël Salaün <mic@...ikod.net>
---
 arch/um/os-Linux/mem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/um/os-Linux/mem.c b/arch/um/os-Linux/mem.c
index 897e9ad..798aeb4 100644
--- a/arch/um/os-Linux/mem.c
+++ b/arch/um/os-Linux/mem.c
@@ -142,7 +142,7 @@ static int __init create_tmp_file(unsigned long long len)
 	if (fd < 0)
 		exit(1);
 
-	err = fchmod(fd, 0777);
+	err = fchmod(fd, 0700);
 	if (err < 0) {
 		perror("fchmod");
 		exit(1);
-- 
2.6.2

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