security: let security modules use PTRACE_MODE_* with bitmasks

It looks like smack and yama weren't aware that the ptrace mode
can have flags ORed into it - PTRACE_MODE_NOAUDIT until now, but
only for /proc/$pid/stat, and with the PTRACE_MODE_*CREDS patch,
all modes have flags ORed into them.

Signed-off-by: Jann Horn <jann@thejh.net>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Morris <james.l.morris@oracle.com>
Cc: "Serge E. Hallyn" <serge.hallyn@ubuntu.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 8d85435..2d6e9bd 100644 (file)
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -398,12 +398,10 @@ static int smk_copy_relabel(struct list_head *nhead, struct list_head *ohead,
  */
 static inline unsigned int smk_ptrace_mode(unsigned int mode)
 {
-       switch (mode) {
-       case PTRACE_MODE_READ:
-               return MAY_READ;
-       case PTRACE_MODE_ATTACH:
+       if (mode & PTRACE_MODE_ATTACH)
                return MAY_READWRITE;
-       }
+       if (mode & PTRACE_MODE_READ)
+               return MAY_READ;
 
        return 0;
 }

diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c
index d3c19c9..cb6ed10 100644 (file)
--- a/security/yama/yama_lsm.c
+++ b/security/yama/yama_lsm.c
@@ -281,7 +281,7 @@ static int yama_ptrace_access_check(struct task_struct *child,
        int rc = 0;
 
        /* require ptrace target be a child of ptracer on attach */
-       if (mode == PTRACE_MODE_ATTACH) {
+       if (mode & PTRACE_MODE_ATTACH) {
                switch (ptrace_scope) {
                case YAMA_SCOPE_DISABLED:
                        /* No additional restrictions. */
@@ -307,7 +307,7 @@ static int yama_ptrace_access_check(struct task_struct *child,
                }
        }
 
-       if (rc) {
+       if (rc && (mode & PTRACE_MODE_NOAUDIT) == 0) {
                printk_ratelimited(KERN_NOTICE
                        "ptrace of pid %d was attempted by: %s (pid %d)\n",
                        child->pid, current->comm, current->pid);