Eric Lee / smarc-fsl-linux-kernel

31 Oct, 2011

1 commit

  • 9984de1a5   kernel: Map most files to use export.h instead of module.h ... Browse Code »

    The changed files were only including linux/module.h for the
    EXPORT_SYMBOL infrastructure, and nothing else. Revector them
    onto the isolated export header for faster compile times.

    Nothing to see here but a whole lot of instances of:

    -#include
    +#include

    This commit is only changing the kernel dir; next targets
    will probably be mm, fs, the arch dirs, etc.

    Signed-off-by: Paul Gortmaker

    Paul Gortmaker
     

11 May, 2011

1 commit

24 Mar, 2011

2 commits

  • bb96a6f50   userns: allow sethostname in a container ... Browse Code »

    Changelog:
    Feb 23: let clone_uts_ns() handle setting uts->user_ns
    To do so we need to pass in the task_struct who'll
    get the utsname, so we can get its user_ns.
    Feb 23: As per Oleg's coment, just pass in tsk, instead of two
    of its members.

    Signed-off-by: Serge E. Hallyn
    Acked-by: "Eric W. Biederman"
    Acked-by: Daniel Lezcano
    Acked-by: David Howells
    Cc: James Morris
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Serge E. Hallyn
     
  • 59607db36   userns: add a user_namespace as creator/owner of uts_namespace ... Browse Code »

    The expected course of development for user namespaces targeted
    capabilities is laid out at https://wiki.ubuntu.com/UserNamespace.

    Goals:

    - Make it safe for an unprivileged user to unshare namespaces. They
    will be privileged with respect to the new namespace, but this should
    only include resources which the unprivileged user already owns.

    - Provide separate limits and accounting for userids in different
    namespaces.

    Status:

    Currently (as of 2.6.38) you can clone with the CLONE_NEWUSER flag to
    get a new user namespace if you have the CAP_SYS_ADMIN, CAP_SETUID, and
    CAP_SETGID capabilities. What this gets you is a whole new set of
    userids, meaning that user 500 will have a different 'struct user' in
    your namespace than in other namespaces. So any accounting information
    stored in struct user will be unique to your namespace.

    However, throughout the kernel there are checks which

    - simply check for a capability. Since root in a child namespace
    has all capabilities, this means that a child namespace is not
    constrained.

    - simply compare uid1 == uid2. Since these are the integer uids,
    uid 500 in namespace 1 will be said to be equal to uid 500 in
    namespace 2.

    As a result, the lxc implementation at lxc.sf.net does not use user
    namespaces. This is actually helpful because it leaves us free to
    develop user namespaces in such a way that, for some time, user
    namespaces may be unuseful.

    Bugs aside, this patchset is supposed to not at all affect systems which
    are not actively using user namespaces, and only restrict what tasks in
    child user namespace can do. They begin to limit privilege to a user
    namespace, so that root in a container cannot kill or ptrace tasks in the
    parent user namespace, and can only get world access rights to files.
    Since all files currently belong to the initila user namespace, that means
    that child user namespaces can only get world access rights to *all*
    files. While this temporarily makes user namespaces bad for system
    containers, it starts to get useful for some sandboxing.

    I've run the 'runltplite.sh' with and without this patchset and found no
    difference.

    This patch:

    copy_process() handles CLONE_NEWUSER before the rest of the namespaces.
    So in the case of clone(CLONE_NEWUSER|CLONE_NEWUTS) the new uts namespace
    will have the new user namespace as its owner. That is what we want,
    since we want root in that new userns to be able to have privilege over
    it.

    Changelog:
    Feb 15: don't set uts_ns->user_ns if we didn't create
    a new uts_ns.
    Feb 23: Move extern init_user_ns declaration from
    init/version.c to utsname.h.

    Signed-off-by: Serge E. Hallyn
    Acked-by: "Eric W. Biederman"
    Acked-by: Daniel Lezcano
    Acked-by: David Howells
    Cc: James Morris
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Serge E. Hallyn
     

19 Jun, 2009

1 commit

24 Aug, 2008

1 commit

29 Apr, 2008

1 commit

20 Sep, 2007

1 commit

  • efc63c4fb   Fix UTS corruption during clone(CLONE_NEWUTS) ... Browse Code »

    struct utsname is copied from master one without any exclusion.

    Here is sample output from one proggie doing

    sethostname("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
    sethostname("bbbbbbbbbbbbbbbbbbbbbbbbbbbbbb");

    and another

    clone(,, CLONE_NEWUTS, ...)
    uname()

    hostname = 'aaaaaaaaaaaaaaaaaaaaaaaaabbbbb'
    hostname = 'bbbaaaaaaaaaaaaaaaaaaaaaaaaaaa'
    hostname = 'aaaaaaaabbbbbbbbbbbbbbbbbbbbbb'
    hostname = 'aaaaaaaaaaaaaaaaaaaaaaaaaabbbb'
    hostname = 'aaaaaaaaaaaaaaaaaaaaaaaaaaaabb'
    hostname = 'aaabbbbbbbbbbbbbbbbbbbbbbbbbbb'
    hostname = 'bbbbbbbbbbbbbbbbaaaaaaaaaaaaaa'

    Hostname is sometimes corrupted.

    Yes, even _the_ simplest namespace activity had bug in it. :-(

    Signed-off-by: Alexey Dobriyan
    Acked-by: Serge Hallyn
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Alexey Dobriyan
     

17 Jul, 2007

2 commits

  • 213dd266d   namespace: ensure clone_flags are always stored in an unsigned long ... Browse Code »

    While working on unshare support for the network namespace I noticed we
    were putting clone flags in an int. Which is weird because the syscall
    uses unsigned long and we at least need an unsigned to properly hold all of
    the unshare flags.

    So to make the code consistent, this patch updates the code to use
    unsigned long instead of int for the clone flags in those places
    where we get it wrong today.

    Signed-off-by: Eric W. Biederman
    Acked-by: Cedric Le Goater
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Eric W. Biederman
     
  • 467e9f4b5   fix create_new_namespaces() return value ... Browse Code »

    dup_mnt_ns() and clone_uts_ns() return NULL on failure. This is wrong,
    create_new_namespaces() uses ERR_PTR() to catch an error. This means that the
    subsequent create_new_namespaces() will hit BUG_ON() in copy_mnt_ns() or
    copy_utsname().

    Modify create_new_namespaces() to also use the errors returned by the
    copy_*_ns routines and not to systematically return ENOMEM.

    [oleg@tv-sign.ru: better changelog]
    Signed-off-by: Cedric Le Goater
    Cc: Serge E. Hallyn
    Cc: Badari Pulavarty
    Cc: Pavel Emelianov
    Cc: Herbert Poetzl
    Cc: Eric W. Biederman
    Cc: Oleg Nesterov
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Cedric Le Goater
     

09 May, 2007

1 commit

  • e3222c4ec   Merge sys_clone()/sys_unshare() nsproxy and namespace handling ... Browse Code »

    sys_clone() and sys_unshare() both makes copies of nsproxy and its associated
    namespaces. But they have different code paths.

    This patch merges all the nsproxy and its associated namespace copy/clone
    handling (as much as possible). Posted on container list earlier for
    feedback.

    - Create a new nsproxy and its associated namespaces and pass it back to
    caller to attach it to right process.

    - Changed all copy_*_ns() routines to return a new copy of namespace
    instead of attaching it to task->nsproxy.

    - Moved the CAP_SYS_ADMIN checks out of copy_*_ns() routines.

    - Removed unnessary !ns checks from copy_*_ns() and added BUG_ON()
    just incase.

    - Get rid of all individual unshare_*_ns() routines and make use of
    copy_*_ns() instead.

    [akpm@osdl.org: cleanups, warning fix]
    [clg@fr.ibm.com: remove dup_namespaces() declaration]
    [serue@us.ibm.com: fix CONFIG_IPC_NS=n, clone(CLONE_NEWIPC) retval]
    [akpm@linux-foundation.org: fix build with CONFIG_SYSVIPC=n]
    Signed-off-by: Badari Pulavarty
    Signed-off-by: Serge Hallyn
    Cc: Cedric Le Goater
    Cc: "Eric W. Biederman"
    Cc:
    Signed-off-by: Cedric Le Goater
    Cc: Oleg Nesterov
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Badari Pulavarty
     

02 Oct, 2006

2 commits

  • 071df104f   [PATCH] namespaces: utsname: implement CLONE_NEWUTS flag ... Browse Code »

    Implement a CLONE_NEWUTS flag, and use it at clone and sys_unshare.

    [clg@fr.ibm.com: IPC unshare fix]
    [bunk@stusta.de: cleanup]
    Signed-off-by: Serge Hallyn
    Cc: Kirill Korotaev
    Cc: "Eric W. Biederman"
    Cc: Herbert Poetzl
    Cc: Andrey Savochkin
    Signed-off-by: Adrian Bunk
    Signed-off-by: Cedric Le Goater
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Serge E. Hallyn
     
  • 4865ecf13   [PATCH] namespaces: utsname: implement utsname namespaces ... Browse Code »

    This patch defines the uts namespace and some manipulators.
    Adds the uts namespace to task_struct, and initializes a
    system-wide init namespace.

    It leaves a #define for system_utsname so sysctl will compile.
    This define will be removed in a separate patch.

    [akpm@osdl.org: build fix, cleanup]
    Signed-off-by: Serge Hallyn
    Cc: Kirill Korotaev
    Cc: "Eric W. Biederman"
    Cc: Herbert Poetzl
    Cc: Andrey Savochkin
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Serge E. Hallyn