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syslog: distinguish between /proc/kmsg and syscalls

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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 <[email protected]>
Acked-by: Serge Hallyn <[email protected]>
Acked-by: John Johansen <[email protected]>
Signed-off-by: James Morris <[email protected]>
This commit is contained in:
Kees Cook 2010-02-03 15:36:43 -08:00 • committed by James Morris
commit 002345925e
8 changed files with 59 additions and 22 deletions
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4
security/smack/smack_lsm.c
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@ -157,12 +157,12 @@ static int smack_ptrace_traceme(struct task_struct *ptp)
*
* Returns 0 on success, error code otherwise.
*/
static int smack_syslog(int type)
static int smack_syslog(int type, bool from_file)
{
int rc;
char *sp = current_security();
rc = cap_syslog(type);
rc = cap_syslog(type, from_file);
if (rc != 0)
return rc;