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seccomp: add timerfd_create and timerfd_settime to the whitelist 

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>
This commit is contained in:
Felix Geyer 2014-01-30 21:28:17 +01:00 committed by Eduardo Otubo
parent 750036a848
commit 8439761852
1 changed files with 3 additions and 1 deletions
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4
qemu-seccomp.c
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@ -143,6 +143,7 @@ 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 },
@ -225,7 +226,8 @@ static const struct QemuSeccompSyscall seccomp_whitelist[] = {
{ SCMP_SYS(fchmod), 240 },
{ SCMP_SYS(shmget), 240 },
{ SCMP_SYS(shmat), 240 },
{ SCMP_SYS(shmdt), 240 }
{ SCMP_SYS(shmdt), 240 },
{ SCMP_SYS(timerfd_create), 240 }
};
int seccomp_start(void)