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| author | Kees Cook <kees.cook@canonical.com> | 2010-02-03 15:36:43 -0800 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2010-02-04 14:20:12 +1100 |
| commit | 002345925e6c45861f60db6f4fc6236713fd8847 (patch) | |
| tree | d7849eafe1755116597166bbebf43e2bee86cb76 /fs/proc | |
| parent | 0719aaf5ead7555b7b7a4a080ebf2826a871384e (diff) | |
| download | kernel-common-002345925e6c45861f60db6f4fc6236713fd8847.tar.gz kernel-common-002345925e6c45861f60db6f4fc6236713fd8847.tar.bz2 kernel-common-002345925e6c45861f60db6f4fc6236713fd8847.zip | |
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 'fs/proc')
| -rw-r--r-- | fs/proc/kmsg.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/fs/proc/kmsg.c b/fs/proc/kmsg.c index 7ca78346d3f0..6a3d843a1088 100644 --- a/fs/proc/kmsg.c +++ b/fs/proc/kmsg.c @@ -12,37 +12,37 @@ #include <linux/poll.h> #include <linux/proc_fs.h> #include <linux/fs.h> +#include <linux/syslog.h> #include <asm/uaccess.h> #include <asm/io.h> extern wait_queue_head_t log_wait; -extern int do_syslog(int type, char __user *bug, int count); - static int kmsg_open(struct inode * inode, struct file * file) { - return do_syslog(1,NULL,0); + return do_syslog(1, NULL, 0, SYSLOG_FROM_FILE); } static int kmsg_release(struct inode * inode, struct file * file) { - (void) do_syslog(0,NULL,0); + (void) do_syslog(0, NULL, 0, SYSLOG_FROM_FILE); return 0; } static ssize_t kmsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { - if ((file->f_flags & O_NONBLOCK) && !do_syslog(9, NULL, 0)) + if ((file->f_flags & O_NONBLOCK) && + !do_syslog(9, NULL, 0, SYSLOG_FROM_FILE)) return -EAGAIN; - return do_syslog(2, buf, count); + return do_syslog(2, buf, count, SYSLOG_FROM_FILE); } static unsigned int kmsg_poll(struct file *file, poll_table *wait) { poll_wait(file, &log_wait, wait); - if (do_syslog(9, NULL, 0)) + if (do_syslog(9, NULL, 0, SYSLOG_FROM_FILE)) return POLLIN | POLLRDNORM; return 0; } |