Skip to content

cloud-kernel
cloud-kernel

openanolis / cloud-kernel
大约 1 年 前同步成功

通知 153
Star 36
Fork 7
cloud-kernel
cloud-kernel

体验新版 GitCode，发现更多精彩内容 >>

切换分支/标签
  1. 13 12月, 2008 2 次提交
    • O
      posix-timers: check ->it_signal instead of ->it_pid to validate the timer · 89992102
      由 Oleg Nesterov 提交于 
      Impact: clean up, speed up

->it_pid (was ->it_process) has also a special meaning: if it is NULL,
the timer is under deletion or it wasn't initialized yet. We can check
->it_signal != NULL instead, this way we can

	- simplify sys_timer_create() a bit

	- remove yet another check from lock_timer()

	- move put_pid(->it_pid) into release_posix_timer() which
	  runs outside of ->it_lock
Signed-off-by: NOleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
      89992102
    • O
      posix-timers: use "struct pid*" instead of "struct task_struct*" · 27af4245
      由 Oleg Nesterov 提交于 
      Impact: restructure, clean up code

k_itimer holds the ref to the ->it_process until sys_timer_delete(). This
allows to pin up to RLIMIT_SIGPENDING dead task_struct's. Change the code
to use "struct pid *" instead.

The patch doesn't kill ->it_process, it places ->it_pid into the union.
->it_process is still used by do_cpu_nanosleep() as before. It would be
trivial to change the nanosleep code as well, but since it uses it_process
in a special way I think it is better to keep this field for grep.

The patch bloats the kernel by 104 bytes and it also adds the new pointer,
->it_signal, to k_itimer. It is used by lock_timer() to verify that the
found timer was not created by another process. It is not clear why do we
use the global database (and thus the global idr_lock) for posix timers.
We still need the signal_struct->posix_timers which contains all useable
timers, perhaps it is better to use some form of per-process array
instead.
Signed-off-by: NOleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
      27af4245
  3. 11 12月, 2008 35 次提交
  5. 10 12月, 2008 3 次提交
    • H
      crypto: api - Disallow cryptomgr as a module if algorithms are built-in · 6a0fcbb4
      由 Herbert Xu 提交于 
      If we have at least one algorithm built-in then it no longer makes
sense to have the testing framework, and hence cryptomgr to be a
module.  It should be either on or off, i.e., built-in or disabled.

This just happens to stop a potential runaway modprobe loop that
seems to trigger on at least one distro.

With fixes from Evgeniy Polyakov.
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
      6a0fcbb4
    • S
      firewire: fw-ohci: fix IOMMU resource exhaustion · 1d1dc5e8
      由 Stefan Richter 提交于 
      There is a DMA map/ unmap imbalance whenever a block write request
packet is sent and then dequeued with ohci_cancel_packet.  The latter
may happen frequently if the AR resp tasklet is executed before the AT
req tasklet for the same transaction.

Add the missing dma_unmap_single.  This fixes
https://bugzilla.redhat.com/show_bug.cgi?id=475156

Reported-by: Emmanuel Kowalski
Tested-by: Emmanuel Kowalski
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>
      1d1dc5e8
    • R
      tracehook: exec double-reporting fix · 85f33466
      由 Roland McGrath 提交于 
      The patch 6341c393 "tracehook: exec" introduced a small regression in
2.6.27 regarding binfmt_misc exec event reporting.  Since the reporting
is now done in the common search_binary_handler() function, an exec
of a misc binary will result in two (or possibly multiple) exec events
being reported, instead of just a single one, because the misc handler
contains a recursive call to search_binary_handler.

To add to the confusion, if PTRACE_O_TRACEEXEC is not active, the multiple
SIGTRAP signals will in fact cause only a single ptrace intercept, as the
signals are not queued.  However, if PTRACE_O_TRACEEXEC is on, the debugger
will actually see multiple ptrace intercepts (PTRACE_EVENT_EXEC).

The test program included below demonstrates the problem.

This change fixes the bug by calling tracehook_report_exec() only in the
outermost search_binary_handler() call (bprm->recursion_depth == 0).

The additional change to restore bprm->recursion_depth after each binfmt
load_binary call is actually superfluous for this bug, since we test the
value saved on entry to search_binary_handler().  But it keeps the use of
of the depth count to its most obvious expected meaning.  Depending on what
binfmt handlers do in certain cases, there could have been false-positive
tests for recursion limits before this change.

    /* Test program using PTRACE_O_TRACEEXEC.
       This forks and exec's the first argument with the rest of the arguments,
       while ptrace'ing.  It expects to see one PTRACE_EVENT_EXEC stop and
       then a successful exit, with no other signals or events in between.

       Test for kernel doing two PTRACE_EVENT_EXEC stops for a binfmt_misc exec:

       $ gcc -g traceexec.c -o traceexec
       $ sudo sh -c 'echo :test:M::foobar::/bin/cat: > /proc/sys/fs/binfmt_misc/register'
       $ echo 'foobar test' > ./foobar
       $ chmod +x ./foobar
       $ ./traceexec ./foobar; echo $?
       ==> good <==
       foobar test
       0
       $
       ==> bad <==
       foobar test
       unexpected status 0x4057f != 0
       3
       $

    */

    #include <stdio.h>
    #include <sys/types.h>
    #include <sys/wait.h>
    #include <sys/ptrace.h>
    #include <unistd.h>
    #include <signal.h>
    #include <stdlib.h>

    static void
    wait_for (pid_t child, int expect)
    {
      int status;
      pid_t p = wait (&status);
      if (p != child)
	{
	  perror ("wait");
	  exit (2);
	}
      if (status != expect)
	{
	  fprintf (stderr, "unexpected status %#x != %#x\n", status, expect);
	  exit (3);
	}
    }

    int
    main (int argc, char **argv)
    {
      pid_t child = fork ();

      if (child < 0)
	{
	  perror ("fork");
	  return 127;
	}
      else if (child == 0)
	{
	  ptrace (PTRACE_TRACEME);
	  raise (SIGUSR1);
	  execv (argv[1], &argv[1]);
	  perror ("execve");
	  _exit (127);
	}

      wait_for (child, W_STOPCODE (SIGUSR1));

      if (ptrace (PTRACE_SETOPTIONS, child,
		  0L, (void *) (long) PTRACE_O_TRACEEXEC) != 0)
	{
	  perror ("PTRACE_SETOPTIONS");
	  return 4;
	}

      if (ptrace (PTRACE_CONT, child, 0L, 0L) != 0)
	{
	  perror ("PTRACE_CONT");
	  return 5;
	}

      wait_for (child, W_STOPCODE (SIGTRAP | (PTRACE_EVENT_EXEC << 8)));

      if (ptrace (PTRACE_CONT, child, 0L, 0L) != 0)
	{
	  perror ("PTRACE_CONT");
	  return 6;
	}

      wait_for (child, W_EXITCODE (0, 0));

      return 0;
    }
Reported-by: NArnd Bergmann <arnd@arndb.de>
CC: Ulrich Weigand <ulrich.weigand@de.ibm.com>
Signed-off-by: NRoland McGrath <roland@redhat.com>
      85f33466