mm: compaction: Use async migration for __GFP_NO_KSWAPD and enforce no writeback

[mv-sheeva.git] / kernel / signal.c

diff --git a/kernel/signal.c b/kernel/signal.c
index 4e3cff10fdceda165e8e9f22c0e9b861dba918d8..31751868de8856cbe4ee909ef09915e6a9a9c679 100644 (file)
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2421,9 +2421,13 @@ SYSCALL_DEFINE3(rt_sigqueueinfo, pid_t, pid, int, sig,
                return -EFAULT;
 
        /* Not even root can pretend to send signals from the kernel.
-          Nor can they impersonate a kill(), which adds source info.  */
-       if (info.si_code >= 0)
+        * Nor can they impersonate a kill()/tgkill(), which adds source info.
+        */
+       if (info.si_code != SI_QUEUE) {
+               /* We used to allow any < 0 si_code */
+               WARN_ON_ONCE(info.si_code < 0);
                return -EPERM;
+       }
        info.si_signo = sig;
 
        /* POSIX.1b doesn't mention process groups.  */
@@ -2437,9 +2441,13 @@ long do_rt_tgsigqueueinfo(pid_t tgid, pid_t pid, int sig, siginfo_t *info)
                return -EINVAL;
 
        /* Not even root can pretend to send signals from the kernel.
-          Nor can they impersonate a kill(), which adds source info.  */
-       if (info->si_code >= 0)
+        * Nor can they impersonate a kill()/tgkill(), which adds source info.
+        */
+       if (info->si_code != SI_QUEUE) {
+               /* We used to allow any < 0 si_code */
+               WARN_ON_ONCE(info->si_code < 0);
                return -EPERM;
+       }
        info->si_signo = sig;
 
        return do_send_specific(tgid, pid, sig, info);