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authorKees Cook <kees.cook@canonical.com>2010-02-03 15:36:43 -0800
committerJames Morris <jmorris@namei.org>2010-02-04 14:20:12 +1100
commit002345925e6c45861f60db6f4fc6236713fd8847 (patch)
treed7849eafe1755116597166bbebf43e2bee86cb76 /kernel/printk.c
parent0719aaf5ead7555b7b7a4a080ebf2826a871384e (diff)
syslog: distinguish between /proc/kmsg and syscalls
This allows the LSM to distinguish between syslog functions originating from /proc/kmsg access and direct syscalls. By default, the commoncaps will now no longer require CAP_SYS_ADMIN to read an opened /proc/kmsg file descriptor. For example the kernel syslog reader can now drop privileges after opening /proc/kmsg, instead of staying privileged with CAP_SYS_ADMIN. MAC systems that implement security_syslog have unchanged behavior. Signed-off-by: Kees Cook <kees.cook@canonical.com> Acked-by: Serge Hallyn <serue@us.ibm.com> Acked-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'kernel/printk.c')
-rw-r--r--kernel/printk.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/kernel/printk.c b/kernel/printk.c
index 17463ca2e22..809cf9a258a 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -35,6 +35,7 @@
#include <linux/kexec.h>
#include <linux/ratelimit.h>
#include <linux/kmsg_dump.h>
+#include <linux/syslog.h>
#include <asm/uaccess.h>
@@ -273,14 +274,14 @@ static inline void boot_delay_msec(void)
* 9 -- Return number of unread characters in the log buffer
* 10 -- Return size of the log buffer
*/
-int do_syslog(int type, char __user *buf, int len)
+int do_syslog(int type, char __user *buf, int len, bool from_file)
{
unsigned i, j, limit, count;
int do_clear = 0;
char c;
int error = 0;
- error = security_syslog(type);
+ error = security_syslog(type, from_file);
if (error)
return error;
@@ -417,7 +418,7 @@ out:
SYSCALL_DEFINE3(syslog, int, type, char __user *, buf, int, len)
{
- return do_syslog(type, buf, len);
+ return do_syslog(type, buf, len, SYSLOG_FROM_CALL);
}
/*