linux-stable.git/kernel/signal.c, branch v3.7.4

signals: sys_ssetmask() uses uninitialized newmask

2013-01-11T17:18:53+00:00

commit 5ba53ff648e785445a32ba39112ed07e4cf588d0 upstream.

Commit 77097ae503b1 ("most of set_current_blocked() callers want
SIGKILL/SIGSTOP removed from set") removed the initialization of newmask
by accident, causing ltp to complain like this:

  ssetmask01    1  TFAIL  :  sgetmask() failed: TEST_ERRNO=???(0): Success

Restore the proper initialization.

Reported-and-tested-by: CAI Qian 
Signed-off-by: Oleg Nesterov 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

coredump: pass siginfo_t* to do_coredump() and below, not merely signr

2012-10-05T18:05:16+00:00

This is a preparatory patch for the introduction of NT_SIGINFO elf note.

With this patch we pass "siginfo_t *siginfo" instead of "int signr" to
do_coredump() and put it into coredump_params.  It will be used by the
next patch.  Most changes are simple s/signr/siginfo->si_signo/.

Signed-off-by: Denys Vlasenko 
Reviewed-by: Oleg Nesterov 
Cc: Amerigo Wang 
Cc: "Jonathan M. Foote" 
Cc: Roland McGrath 
Cc: Pedro Alves 
Cc: Fengguang Wu 
Cc: Stephen Rothwell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

coredump: update coredump-related headers

2012-10-05T18:05:15+00:00

Create a new header file, fs/coredump.h, which contains functions only
used by the new coredump.c.  It also moves do_coredump to the
include/linux/coredump.h header file, for consistency.

Signed-off-by: Alex Kelly 
Reviewed-by: Josh Triplett 
Acked-by: Serge Hallyn 
Acked-by: Kees Cook 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

task_work: Simplify the usage in ptrace_notify() and get_signal_to_deliver()

2012-09-13T14:47:37+00:00

ptrace_notify() and get_signal_to_deliver() do unnecessary things
before task_work_run():

1. smp_mb__after_clear_bit() is not needed, test_and_clear_bit()
   implies mb().

2. And we do not need the barrier at all, in this case we only
   care about the "synchronous" works added by the task itself.

3. No need to clear TIF_NOTIFY_RESUME, and we should not assume
   task_works is the only user of this flag.

Signed-off-by: Oleg Nesterov 
Signed-off-by: Peter Zijlstra 
Cc: Al Viro 
Cc: Linus Torvalds 
Cc: Andrew Morton 
Cc: Thomas Gleixner 
Link: http://lkml.kernel.org/r/20120826191217.GA4238@redhat.com
Signed-off-by: Ingo Molnar

signal: make sure we don't get stopped with pending task_work

2012-07-22T19:57:54+00:00

Signed-off-by: Al Viro

new helper: signal_delivered()

2012-06-01T16:58:52+00:00

Does block_sigmask() + tracehook_signal_handler();  called when
sigframe has been successfully built.  All architectures converted
to it; block_sigmask() itself is gone now (merged into this one).

I'm still not too happy with the signature, but that's a separate
story (IMO we need a structure that would contain signal number +
siginfo + k_sigaction, so that get_signal_to_deliver() would fill one,
signal_delivered(), handle_signal() and probably setup...frame() -
take one).

Signed-off-by: Al Viro

most of set_current_blocked() callers want SIGKILL/SIGSTOP removed from set

2012-06-01T16:58:51+00:00

Only 3 out of 63 do not.  Renamed the current variant to __set_current_blocked(),
added set_current_blocked() that will exclude unblockable signals, switched
open-coded instances to it.

Signed-off-by: Al Viro

pull clearing RESTORE_SIGMASK into block_sigmask()

2012-06-01T16:58:49+00:00

Signed-off-by: Al Viro

HAVE_RESTORE_SIGMASK is defined on all architectures now

2012-06-01T16:58:46+00:00

Everyone either defines it in arch thread_info.h or has TIF_RESTORE_SIGMASK
and picks default set_restore_sigmask() in linux/thread_info.h.  Kill the
ifdefs, slap #error in linux/thread_info.h to catch breakage when new ones
get merged.

Signed-off-by: Al Viro

pidns: use task_active_pid_ns in do_notify_parent

2012-06-01T00:49:31+00:00

Using task_active_pid_ns is more robust because it works even after we
have called exit_namespaces.  This change allows us to have parent
processes that are zombies.  Normally a zombie parent processes is crazy
and the last thing you would want to have but in the case of not letting
the init process of a pid namespace be reaped until all of it's children
are dead and reaped a zombie parent process is exactly what we want.

Signed-off-by: Eric W. Biederman 
Cc: Oleg Nesterov 
Cc: Pavel Emelyanov 
Cc: Cyrill Gorcunov 
Cc: Louis Rilling 
Cc: Mike Galbraith 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds