linux-kernel - [PATCH] syslog: check cap_syslog when dmesg

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Message-ID: <20101208151901.GA20557@mail.hallyn.com>
Date:	Wed, 8 Dec 2010 15:19:01 +0000
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	James Morris <jmorris@...ei.org>, Eric Paris <eparis@...hat.com>,
	Stephen Smalley <sds@...ho.nsa.gov>, dwalsh@...hat.com,
	Kees Cook <kees.cook@...onical.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] syslog: check cap_syslog when dmesg_restrict

Eric Paris pointed out that it doesn't make sense to require
both CAP_SYS_ADMIN and CAP_SYSLOG for certain syslog actions.
So require CAP_SYSLOG, not CAP_SYS_ADMIN, when dmesg_restrict
is set.

(I'm also consolidating the now common error path)

Signed-off-by: Serge E. Hallyn <serge.hallyn@...onical.com>
---
 Documentation/sysctl/kernel.txt |    2 +-
 kernel/printk.c                 |   20 ++++++++++----------
 2 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index 209e158..5740671 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -219,7 +219,7 @@ dmesg_restrict:
 This toggle indicates whether unprivileged users are prevented from using
 dmesg(8) to view messages from the kernel's log buffer.  When
 dmesg_restrict is set to (0) there are no restrictions.  When
-dmesg_restrict is set set to (1), users must have CAP_SYS_ADMIN to use
+dmesg_restrict is set set to (1), users must have CAP_SYSLOG to use
 dmesg(8).
 
 The kernel config option CONFIG_SECURITY_DMESG_RESTRICT sets the default
diff --git a/kernel/printk.c b/kernel/printk.c
index 0712380..0cecba0 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -279,18 +279,12 @@ int do_syslog(int type, char __user *buf, int len, bool from_file)
 	 * at open time.
 	 */
 	if (type == SYSLOG_ACTION_OPEN || !from_file) {
-		if (dmesg_restrict && !capable(CAP_SYS_ADMIN))
-			return -EPERM;
+		if (dmesg_restrict && !capable(CAP_SYSLOG))
+			goto warn; /* switch to return -EPERM after 2.6.39 */
 		if ((type != SYSLOG_ACTION_READ_ALL &&
 		     type != SYSLOG_ACTION_SIZE_BUFFER) &&
-		    !capable(CAP_SYSLOG)) {
-			/* remove after 2.6.38 */
-			if (capable(CAP_SYS_ADMIN))
-				WARN_ONCE(1, "Attempt to access syslog with "
-				  "CAP_SYS_ADMIN but no CAP_SYSLOG "
-				  "(deprecated and denied).\n");
-			return -EPERM;
-		}
+		    !capable(CAP_SYSLOG))
+			goto warn; /* switch to return -EPERM after 2.6.39 */
 	}
 
 	error = security_syslog(type);
@@ -434,6 +428,12 @@ int do_syslog(int type, char __user *buf, int len, bool from_file)
 	}
 out:
 	return error;
+warn:
+	/* remove after 2.6.39 */
+	if (capable(CAP_SYS_ADMIN))
+		WARN_ONCE(1, "Attempt to access syslog with CAP_SYS_ADMIN "
+		  "but no CAP_SYSLOG (deprecated and denied).\n");
+	return -EPERM;
 }
 
 SYSCALL_DEFINE3(syslog, int, type, char __user *, buf, int, len)
-- 
1.7.0.4

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