Re: [PATCH 1/1] use more compatible code in special_mapping_restore

Quoting Serge E. Hallyn (serue@...):
> (Also remove some unused vars in my do_unmap helper)
> 
> Signed-off-by: Serge E. Hallyn <serue@...>

Please don't apply this.  It wasn't supposed to change behavior,
but it does, for the worse.

> ---
>  mm/mmap.c |   12 +++++-------
>  1 files changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/mm/mmap.c b/mm/mmap.c
> index 15afae6..468c8e2 100644
> --- a/mm/mmap.c
> +++ b/mm/mmap.c
>  <at>  <at>  -30,6 +30,7  <at>  <at> 
>  #include <linux/mmu_notifier.h>
>  #include <linux/perf_event.h>
>  #include <linux/checkpoint.h>
> +#include <linux/compat.h>
> 
>  #include <asm/uaccess.h>
>  #include <asm/cacheflush.h>
>  <at>  <at>  -1960,9 +1961,6  <at>  <at>  int do_munmap_nocheck(struct mm_struct *mm, unsigned long start, size_t len)
> 
>  int do_munmap(struct mm_struct *mm, unsigned long start, size_t len)
>  {
> -	unsigned long end;
> -	struct vm_area_struct *vma, *prev, *last;

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syphi lis  sofas  uncon necte d  freck ling  regul arize  planl essly
chart s  mania c  corru gatio n  seclu ding  charo llais  impar ity
expou nd  drive line  fille ts  rashe r  illyr ia  collo p  slue
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r  reson ating  hermo upoli s  opere ttist  highr oad  blemi shing
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ll  pasto ralis es  yacht sman  runag ate  aviem ore  conce ptual
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Kernel 2.6.33-rc6, 3 bugs container specific.

Hello,

        Tried 2.6.33-rc6 to check container, 3 bugs show up.
        (test done on x86_64, Pentium(R) Dual-Core CPU E5400)

        #1: Critical / fixed?:
        Already reported: system hang very badly if you start
        a container (clone) while cloneflag is set with at least 
        one of the set:
        CLONE_NEWNET|CLONE_NEWIPC|CLONE_NEWNS|CLONE_NEWPID|CLONE_NEWUTS.

        Bug is said fixed: 
        (commit  fabf318e5e4bda0aca2b0d617b191884fda62703),
        and is somewhere in queue, hopefully will be part of rc7.

        #2: Trouble  / can be override by sys_admin
         arping not working if HOST interface not named
         the same as in CONT. 

            Lets say you set the HOST "eth0" interface to be
            "fast" to met whatever your standard are and
            rename CONT veth to be eth0 using command:
            ip link set vth_name name eth0
            (within CONT) to allow very standard CONT template.

           directory HOST:/sys/class/net will report
           br0  fast lo  sit0 'to-vth'

           directory CONT:/sys/class/net will report
           exactly the same

[PATCH RFC] checkpoint: handle saved_sigmask

Each arch seems to have its own way of specifying that
current->saved_sigmask should contains the valid blocked
sigmask.  So provide an arch-specific hook for that test,
and, if true, then store saved_sigmask in place of blocked
in the checkpoint image.  None of the architectures currently
save these flags, so we don't need to do anything special
to unset them after restart.

If right after sys_restart the a signal needs to be handled
(which was sent during restart) then it will just do the right
thing (save blocked back to saved_sigmask and set
TIF_RESTORE_SIGMASK or whatever).

Thoughts?

Signed-off-by: Serge E. Hallyn <serue@...>
---
 arch/powerpc/kernel/signal.c  |    9 +++++++++
 arch/s390/kernel/checkpoint.c |    2 --
 arch/s390/kernel/signal.c     |    7 +++++++
 arch/x86/kernel/signal.c      |    6 ++++++
 checkpoint/signal.c           |    5 ++++-
 include/linux/signal.h        |    6 ++++++
 6 files changed, 32 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c
index 00b5078..4aa0128 100644
--- a/arch/powerpc/kernel/signal.c
+++ b/arch/powerpc/kernel/signal.c
 <at>  <at>  -188,6 +188,15  <at>  <at>  static int do_signal_pending(sigset_t *oldset, struct pt_regs *regs)

[PATCH][cr-tests]: eclone-1: Test basic functionality

From: Sukadev Bhattiprolu <sukadev@...>
Date: Sat, 30 Jan 2010 12:49:30 -0800
Subject: [PATCH 1/6] eclone-1: Test basic functionality

Verify that a child process gets the expected pid and arguments on stack
when it is created with eclone() system call.

NOTE:	The myclone() function in eclone-lib.c supports just x86 for now.
	Needs to be ported to other architectures.

Signed-off-by: Sukadev Bhattiprolu <sukadev@...>
---
 Makefile            |    2 +-
 eclone/Makefile     |   16 +++++++
 eclone/clone_args.h |   37 ++++++++++++++++
 eclone/eclone-1.c   |  121 +++++++++++++++++++++++++++++++++++++++++++++++++++
 eclone/eclone-lib.c |   85 ++++++++++++++++++++++++++++++++++++
 5 files changed, 260 insertions(+), 1 deletions(-)
 create mode 100644 eclone/Makefile
 create mode 100644 eclone/clone_args.h
 create mode 100644 eclone/eclone-1.c
 create mode 100644 eclone/eclone-lib.c

diff --git a/Makefile b/Makefile
index 95f8b6e..1d412b9 100644
--- a/Makefile
+++ b/Makefile
 <at>  <at>  -1,5 +1,5  <at>  <at> 
 SUBDIRS = libcrtest counterloop fileio simple userns ipc sleep \

[PATCH 2/6][cr-tests]: eclone-2: Fail if selected pid is in use

From: Sukadev Bhattiprolu <sukadev@...>
Date: Sat, 30 Jan 2010 12:51:23 -0800
Subject: [PATCH 2/6]: eclone-2: Fail if selected pid is in use

Ensure that eclone() system call fails with -EBUSY if selected pid is
in use.

Signed-off-by: Sukadev Bhattiprolu <sukadev@...>
---
 eclone/Makefile   |    2 +-
 eclone/eclone-2.c |  117 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 118 insertions(+), 1 deletions(-)
 create mode 100644 eclone/eclone-2.c

diff --git a/eclone/Makefile b/eclone/Makefile
index 43cef65..95633d1 100644
--- a/eclone/Makefile
+++ b/eclone/Makefile
 <at>  <at>  -3,7 +3,7  <at>  <at>  CFLAGS = -Wall

 LDFLAGS = 

-PROGS = eclone-1
+PROGS = eclone-1 eclone-2

 all: $(PROGS)

diff --git a/eclone/eclone-2.c b/eclone/eclone-2.c
new file mode 100644

[PATCH 3/6][cr-tests]: eclone-3: Fail if reserved fields are not 0

From: Sukadev Bhattiprolu <sukadev@...>
Date: Sat, 30 Jan 2010 12:53:04 -0800
Subject: [PATCH 3/6][cr-tests]: eclone-3: Fail if reserved fields are not 0.

To ensure future extendability, we want the unused fields to be 0.
Ensure eclone() fails if ->reserved0 field is non-0.

Signed-off-by: Sukadev Bhattiprolu <sukadev@...>
---
 eclone/Makefile   |    2 +-
 eclone/eclone-3.c |  117 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 118 insertions(+), 1 deletions(-)
 create mode 100644 eclone/eclone-3.c

diff --git a/eclone/Makefile b/eclone/Makefile
index 95633d1..ebe508d 100644
--- a/eclone/Makefile
+++ b/eclone/Makefile
 <at>  <at>  -3,7 +3,7  <at>  <at>  CFLAGS = -Wall

 LDFLAGS = 

-PROGS = eclone-1 eclone-2
+PROGS = eclone-1 eclone-2 eclone-3

 all: $(PROGS)

diff --git a/eclone/eclone-3.c b/eclone/eclone-3.c
new file mode 100644

[PATCH 4/6][cr-tests]: eclone-4: Fail if clone_flags_high is non-zero

From: Sukadev Bhattiprolu <sukadev@...>
Date: Mon, 1 Feb 2010 18:10:32 -0800
Subject: [PATCH 4/6][cr-tests]: eclone-4: Fail if clone_flags_high is non-zero

To ensure future extendability, we want the unused fields to be 0. Ensure
eclone() fails if ->clone_flags_high field is non-0.

Signed-off-by: Sukadev Bhattiprolu <sukadev@...>
---
 eclone/Makefile   |    2 +-
 eclone/eclone-4.c |  116 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 117 insertions(+), 1 deletions(-)
 create mode 100644 eclone/eclone-4.c

diff --git a/eclone/Makefile b/eclone/Makefile
index ebe508d..86ca859 100644
--- a/eclone/Makefile
+++ b/eclone/Makefile
 <at>  <at>  -3,7 +3,7  <at>  <at>  CFLAGS = -Wall

 LDFLAGS = 

-PROGS = eclone-1 eclone-2 eclone-3
+PROGS = eclone-1 eclone-2 eclone-3 eclone-4

 all: $(PROGS)

diff --git a/eclone/eclone-4.c b/eclone/eclone-4.c
new file mode 100644