linux-stable.git/arch/um/os-Linux/process.c, branch linux-3.10.y

um: Implement probe_kernel_read()

2013-09-27T00:18:29+00:00

commit f75b1b1bedfb498cc43a992ce4d7ed8df3b1e770 upstream.

UML needs it's own probe_kernel_read() to handle kernel
mode faults correctly.
The implementation uses mincore() on the host side to detect
whether a page is owned by the UML kernel process.

This fixes also a possible crash when sysrq-t is used.
Starting with 3.10 sysrq-t calls probe_kernel_read() to
read details from the kernel workers. As kernel worker are
completely async pointers may turn NULL while reading them.

Signed-off-by: Richard Weinberger 
Cc: 
Cc: 
Signed-off-by: Greg Kroah-Hartman

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

2012-10-13T01:05:52+00:00

Pull third pile of kernel_execve() patches from Al Viro:
 "The last bits of infrastructure for kernel_thread() et.al., with
  alpha/arm/x86 use of those.  Plus sanitizing the asm glue and
  do_notify_resume() on alpha, fixing the "disabled irq while running
  task_work stuff" breakage there.

  At that point the rest of kernel_thread/kernel_execve/sys_execve work
  can be done independently for different architectures.  The only
  pending bits that do depend on having all architectures converted are
  restrictred to fs/* and kernel/* - that'll obviously have to wait for
  the next cycle.

  I thought we'd have to wait for all of them done before we start
  eliminating the longjump-style insanity in kernel_execve(), but it
  turned out there's a very simple way to do that without flagday-style
  changes."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal:
  alpha: switch to saner kernel_execve() semantics
  arm: switch to saner kernel_execve() semantics
  x86, um: convert to saner kernel_execve() semantics
  infrastructure for saner ret_from_kernel_thread semantics
  make sure that kernel_thread() callbacks call do_exit() themselves
  make sure that we always have a return path from kernel_execve()
  ppc: eeh_event should just use kthread_run()
  don't bother with kernel_thread/kernel_execve for launching linuxrc
  alpha: get rid of switch_stack argument of do_work_pending()
  alpha: don't bother passing switch_stack separately from regs
  alpha: take SIGPENDING/NOTIFY_RESUME loop into signal.c
  alpha: simplify TIF_NEED_RESCHED handling

x86, um: convert to saner kernel_execve() semantics

2012-10-12T17:35:22+00:00

Signed-off-by: Al Viro

um: get rid of pointless include "..." where include <...> will do

2012-10-09T20:28:45+00:00

Signed-off-by: Al Viro 
Signed-off-by: Richard Weinberger

um: shared/process.h is empty now; kill it

2011-11-02T13:15:00+00:00

Signed-off-by: Al Viro 
Signed-off-by: Richard Weinberger

um: fill the handlers array at build time

2011-11-02T13:14:57+00:00

Signed-off-by: Al Viro 
Signed-off-by: Richard Weinberger

um: simplify set_handler()

2011-11-02T13:14:56+00:00

For one thing, we always block the same signals (IRQ ones - IO, WINCH, VTALRM),
so there's no need to pass sa_mask elements in arguments.  For another, the
flags depend only on whether it's an IRQ signal or not (we add SA_RESTART
for them).

Signed-off-by: Al Viro 
Signed-off-by: Richard Weinberger

um: don't bother blocking SIGARLM and SIGUSR1

2011-11-02T13:14:55+00:00

We used to generate those, but we hadn't done that for a long
time.  No need to bother blocking them for signal handlers.

Signed-off-by: Al Viro 
Signed-off-by: Richard Weinberger

um: -include user.h for USER_OBJ, trim includes

2011-11-02T13:14:44+00:00

Signed-off-by: Al Viro 
Signed-off-by: Richard Weinberger

um: fix crash while os_dump_core()

2011-05-25T15:39:42+00:00

os_dump_core() emits SIGTERM to terminate all UML processes.  Kernel
threads have to exit on SIGTERM instead of calling last_ditch_exit().
Multiple calls to last_ditch_exit() can cause a crash.

Signed-off-by: Richard Weinberger 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds