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From 982a3d6d0569bed08ee7d31380271abe69d836b4 Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Thu, 30 Apr 2015 10:31:57 +0200
Subject: [PATCH 1/4] seccomp: add timerfd_create and timerfd_settime to the
 whitelist

Message-id: <1430389917-29237-2-git-send-email-kraxel@redhat.com>
Patchwork-id: 64959
O-Subject: [RHEL-7.1 qemu-kvm PATCH 1/1] seccomp: add timerfd_create and timerfd_settime to the whitelist
Bugzilla: 1185737
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
RH-Acked-by: Markus Armbruster <armbru@redhat.com>

From: Felix Geyer <debfx@fobos.de>

libusb calls timerfd_create() and timerfd_settime() when it's built with
timerfd support.

Command to reproduce:

       -device usb-host,hostbus=1,hostaddr=3,id=hostdev0

Log messages:

audit(1390730418.924:135): auid=4294967295 uid=121 gid=103 ses=4294967295
                           pid=5232 comm="qemu-system-x86" sig=31 syscall=283
                           compat=0 ip=0x7f2b0f4e96a7 code=0x0
audit(1390733100.580:142): auid=4294967295 uid=121 gid=103 ses=4294967295
                           pid=16909 comm="qemu-system-x86" sig=31 syscall=286
                           compat=0 ip=0x7f03513a06da code=0x0

Reading a few hundred MB from a USB drive on x86_64 shows this syscall distribution.
Therefore the timerfd_settime priority is set to 242.

    calls  syscall
 --------- ----------------
   5303600 write
   2240554 read
   2167030 ppoll
   2134828 ioctl
    704023 timerfd_settime
    689105 poll
     83122 futex
       803 writev
       476 rt_sigprocmask
       287 recvmsg
       178 brk

Signed-off-by: Felix Geyer <debfx@fobos.de>
Signed-off-by: Eduardo Otubo <otubo@linux.vnet.ibm.com>
(cherry picked from commit 84397618529f920bea45d0bab22ec097766244fc)
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>

Conflicts:
	qemu-seccomp.c
---
 qemu-seccomp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
 qemu-seccomp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/qemu-seccomp.c b/qemu-seccomp.c
index 59cae8e..5e60fce 100644
--- a/qemu-seccomp.c
+++ b/qemu-seccomp.c
@@ -154,6 +154,7 @@ static const struct QemuSeccompSyscall seccomp_whitelist[] = {
     { SCMP_SYS(getsockname), 242 },
     { SCMP_SYS(getpeername), 242 },
     { SCMP_SYS(accept4), 242 },
+    { SCMP_SYS(timerfd_settime), 242 },
     { SCMP_SYS(newfstatat), 241 },
     { SCMP_SYS(shutdown), 241 },
     { SCMP_SYS(getsockopt), 241 },
@@ -246,7 +247,8 @@ static const struct QemuSeccompSyscall seccomp_whitelist[] = {
     { SCMP_SYS(shmctl), 240 },
     { SCMP_SYS(mlock), 240 },
     { SCMP_SYS(munlock), 240 },
-    { SCMP_SYS(semctl), 240 }
+    { SCMP_SYS(semctl), 240 },
+    { SCMP_SYS(timerfd_create), 240 },
 };
 
 int seccomp_start(void)
-- 
1.8.3.1