From d96e86c7415ead4d5330715cc4afa3989e4861e0 Mon Sep 17 00:00:00 2001
From: Jan Kiszka <jan.kiszka@siemens.com>
Date: Thu, 10 May 2012 10:04:36 -0300
Subject: [PATCH] --- yaml --- r: 300131 b: refs/heads/master c:
 b7dafa0ef3145c31d7753be0a08b3cbda51f0209 h: refs/heads/master i:   300129:
 216dad50b0cb7a590016cc42460eca01d119cd29   300127:
 92bd6e5c1201cd25f59c3f66c4f890cd5f8a832e v: v3

---
 [refs]                |  2 +-
 trunk/kernel/compat.c | 63 +++++++++++++++++++++++++++++++------------
 2 files changed, 47 insertions(+), 18 deletions(-)

diff --git a/[refs] b/[refs]
index 7ff8fcda2e4d..b09d177c5f5e 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 7ee94d97aafacf5a019b3578e0eae6daa2e2bcd5
+refs/heads/master: b7dafa0ef3145c31d7753be0a08b3cbda51f0209
diff --git a/trunk/kernel/compat.c b/trunk/kernel/compat.c
index 74ff8498809a..d2c67aa49ae6 100644
--- a/trunk/kernel/compat.c
+++ b/trunk/kernel/compat.c
@@ -372,25 +372,54 @@ asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
 
 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 
-asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
-		compat_old_sigset_t __user *oset)
+/*
+ * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
+ * blocked set of signals to the supplied signal set
+ */
+static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
 {
-	old_sigset_t s;
-	long ret;
-	mm_segment_t old_fs;
+	memcpy(blocked->sig, &set, sizeof(set));
+}
 
-	if (set && get_user(s, set))
-		return -EFAULT;
-	old_fs = get_fs();
-	set_fs(KERNEL_DS);
-	ret = sys_sigprocmask(how,
-			      set ? (old_sigset_t __user *) &s : NULL,
-			      oset ? (old_sigset_t __user *) &s : NULL);
-	set_fs(old_fs);
-	if (ret == 0)
-		if (oset)
-			ret = put_user(s, oset);
-	return ret;
+asmlinkage long compat_sys_sigprocmask(int how,
+				       compat_old_sigset_t __user *nset,
+				       compat_old_sigset_t __user *oset)
+{
+	old_sigset_t old_set, new_set;
+	sigset_t new_blocked;
+
+	old_set = current->blocked.sig[0];
+
+	if (nset) {
+		if (get_user(new_set, nset))
+			return -EFAULT;
+		new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
+
+		new_blocked = current->blocked;
+
+		switch (how) {
+		case SIG_BLOCK:
+			sigaddsetmask(&new_blocked, new_set);
+			break;
+		case SIG_UNBLOCK:
+			sigdelsetmask(&new_blocked, new_set);
+			break;
+		case SIG_SETMASK:
+			compat_sig_setmask(&new_blocked, new_set);
+			break;
+		default:
+			return -EINVAL;
+		}
+
+		set_current_blocked(&new_blocked);
+	}
+
+	if (oset) {
+		if (put_user(old_set, oset))
+			return -EFAULT;
+	}
+
+	return 0;
 }
 
 #endif