user/sven/linux.git/ipc, branch v3.8

ipc: add more comments to message copying related code

2013-01-05T00:11:46Z

Signed-off-by: Stanislav Kinsbursky Cc: "Eric W. Biederman" Cc: James Morris Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ipc: simplify message copying

2013-01-05T00:11:46Z

Remove the redundant and confusing fill_copy(). Also add copy_msg() check for error. In this case exit from the function have to be done instead of break, because further code interprets any error as EAGAIN. Also define copy_msg() for the case when CONFIG_CHECKPOINT_RESTORE is disabled. Signed-off-by: Stanislav Kinsbursky Cc: "Eric W. Biederman" Cc: James Morris Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ipc: convert prepare_copy() from macro to function

2013-01-05T00:11:46Z

This code works if CONFIG_CHECKPOINT_RESTORE is disabled. [akpm@linux-foundation.org: remove __maybe_unused] Signed-off-by: Stanislav Kinsbursky Cc: "Eric W. Biederman" Cc: James Morris Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ipc: simplify free_copy() call

2013-01-05T00:11:45Z

Passing and checking of msgflg to free_copy() is redundant. This patch sets copy to NULL on declaration instead and checks for non-NULL in free_copy(). Note: in case of copy allocation failure, error is returned immediately. So no need to check for IS_ERR() in free_copy(). Signed-off-by: Stanislav Kinsbursky Cc: "Eric W. Biederman" Cc: James Morris Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

selftests: IPC message queue copy feature test

2013-01-05T00:11:45Z

This test can be used to check wheither kernel supports IPC message queue copy and restore features (required by CRIU project). Signed-off-by: Stanislav Kinsbursky Cc: Serge Hallyn Cc: "Eric W. Biederman" Cc: Pavel Emelyanov Cc: Al Viro Cc: KOSAKI Motohiro Cc: Michael Kerrisk Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ipc: introduce message queue copy feature

2013-01-05T00:11:45Z

This patch is required for checkpoint/restore in userspace. c/r requires some way to get all pending IPC messages without deleting them from the queue (checkpoint can fail and in this case tasks will be resumed, so queue have to be valid). To achive this, new operation flag MSG_COPY for sys_msgrcv() system call was introduced. If this flag was specified, then mtype is interpreted as number of the message to copy. If MSG_COPY is set, then kernel will allocate dummy message with passed size, and then use new copy_msg() helper function to copy desired message (instead of unlinking it from the queue). Notes: 1) Return -ENOSYS if MSG_COPY is specified, but CONFIG_CHECKPOINT_RESTORE is not set. Signed-off-by: Stanislav Kinsbursky Cc: Serge Hallyn Cc: "Eric W. Biederman" Cc: Pavel Emelyanov Cc: Al Viro Cc: KOSAKI Motohiro Cc: Michael Kerrisk Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ipc: message queue receive cleanup

2013-01-05T00:11:45Z

Move all message related manipulation into one function msg_fill(). Actually, two functions because of the compat one. [akpm@linux-foundation.org: checkpatch fixes] Signed-off-by: Stanislav Kinsbursky Cc: Serge Hallyn Cc: "Eric W. Biederman" Cc: Pavel Emelyanov Cc: Al Viro Cc: KOSAKI Motohiro Cc: Michael Kerrisk Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ipc: add sysctl to specify desired next object id

2013-01-05T00:11:45Z

Add 3 new variables and sysctls to tune them (by one "next_id" variable for messages, semaphores and shared memory respectively). This variable can be used to set desired id for next allocated IPC object. By default it's equal to -1 and old behaviour is preserved. If this variable is non-negative, then desired idr will be extracted from it and used as a start value to search for free IDR slot. Notes: 1) this patch doesn't guarantee that the new object will have desired id. So it's up to user space how to handle new object with wrong id. 2) After a sucessful id allocation attempt, "next_id" will be set back to -1 (if it was non-negative). [akpm@linux-foundation.org: checkpatch fixes] Signed-off-by: Stanislav Kinsbursky Cc: Serge Hallyn Cc: "Eric W. Biederman" Cc: Pavel Emelyanov Cc: Al Viro Cc: KOSAKI Motohiro Cc: Michael Kerrisk Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ipc: remove forced assignment of selected message

2013-01-05T00:11:45Z

This is a cleanup patch. The assignment is redundant. Signed-off-by: Stanislav Kinsbursky Cc: Serge Hallyn Cc: "Eric W. Biederman" Cc: Pavel Emelyanov Cc: Al Viro Cc: KOSAKI Motohiro Cc: Michael Kerrisk Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2012-12-18T18:55:28Z

Pull (again) user namespace infrastructure changes from Eric Biederman: "Those bugs, those darn embarrasing bugs just want don't want to get fixed. Linus I just updated my mirror of your kernel.org tree and it appears you successfully pulled everything except the last 4 commits that fix those embarrasing bugs. When you get a chance can you please repull my branch" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: userns: Fix typo in description of the limitation of userns_install userns: Add a more complete capability subset test to commit_creds userns: Require CAP_SYS_ADMIN for most uses of setns. Fix cap_capable to only allow owners in the parent user namespace to have caps.