check: check PTRACE_{GET,SET}SIGMASK

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-check.c

@@ -468,6 +468,7 @@ int check_ptrace_peeksiginfo()
 	struct ptrace_peeksiginfo_args arg;
 	siginfo_t siginfo;
 	pid_t pid, ret = 0;
+	k_rtsigset_t mask;
 
 	pid = fork();
 	if (pid < 0)
@@ -492,6 +493,11 @@ int check_ptrace_peeksiginfo()
 		ret = -1;
 	}
 
+	if (ptrace(PTRACE_GETSIGMASK, pid, sizeof(mask), &mask) != 0) {
+		pr_perror("Unable to dump signal blocking mask");
+		ret = -1;
+	}
+
 	ptrace(PTRACE_KILL, pid, NULL, NULL);
 
 	return ret;

include/ptrace.h

@@ -27,6 +27,9 @@ struct ptrace_peeksiginfo_args {
 #define PTRACE_PEEKSIGINFO_SHARED       (1 << 0)
 #endif
 
+#define PTRACE_GETSIGMASK	0x420a
+#define PTRACE_SETSIGMASK	0x420b
+
 #define PTRACE_SEIZE_DEVEL	0x80000000
 
 #define PTRACE_EVENT_FORK	1