1. 18 Nov, 2017 1 commit
  2. 14 Jan, 2017 1 commit
    • Peter Zijlstra's avatar
      locking/atomic, kref: Add KREF_INIT() · 1e24edca
      Peter Zijlstra authored
      Since we need to change the implementation, stop exposing internals.
      Provide KREF_INIT() to allow static initialization of struct kref.
      Signed-off-by: 's avatarPeter Zijlstra (Intel) <peterz@infradead.org>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: linux-kernel@vger.kernel.org
      Signed-off-by: 's avatarIngo Molnar <mingo@kernel.org>
  3. 04 Dec, 2014 2 commits
  4. 01 May, 2013 1 commit
  5. 20 Nov, 2012 1 commit
    • Eric W. Biederman's avatar
      proc: Usable inode numbers for the namespace file descriptors. · 98f842e6
      Eric W. Biederman authored
      Assign a unique proc inode to each namespace, and use that
      inode number to ensure we only allocate at most one proc
      inode for every namespace in proc.
      A single proc inode per namespace allows userspace to test
      to see if two processes are in the same namespace.
      This has been a long requested feature and only blocked because
      a naive implementation would put the id in a global space and
      would ultimately require having a namespace for the names of
      namespaces, making migration and certain virtualization tricks
      We still don't have per superblock inode numbers for proc, which
      appears necessary for application unaware checkpoint/restart and
      migrations (if the application is using namespace file descriptors)
      but that is now allowd by the design if it becomes important.
      I have preallocated the ipc and uts initial proc inode numbers so
      their structures can be statically initialized.
      Signed-off-by: 's avatarEric W. Biederman <ebiederm@xmission.com>
  6. 24 Mar, 2011 1 commit
    • Serge E. Hallyn's avatar
      userns: add a user_namespace as creator/owner of uts_namespace · 59607db3
      Serge E. Hallyn authored
      The expected course of development for user namespaces targeted
      capabilities is laid out at https://wiki.ubuntu.com/UserNamespace.
      - 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
        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
        - 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
      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
      	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: 's avatarSerge E. Hallyn <serge.hallyn@canonical.com>
      Acked-by: 's avatar"Eric W. Biederman" <ebiederm@xmission.com>
      Acked-by: 's avatarDaniel Lezcano <daniel.lezcano@free.fr>
      Acked-by: 's avatarDavid Howells <dhowells@redhat.com>
      Cc: James Morris <jmorris@namei.org>
      Signed-off-by: 's avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: 's avatarLinus Torvalds <torvalds@linux-foundation.org>
  7. 12 Dec, 2009 2 commits
  8. 25 Jul, 2008 2 commits
  9. 14 Feb, 2007 1 commit
    • Tim Schmielau's avatar
      [PATCH] remove many unneeded #includes of sched.h · cd354f1a
      Tim Schmielau authored
      After Al Viro (finally) succeeded in removing the sched.h #include in module.h
      recently, it makes sense again to remove other superfluous sched.h includes.
      There are quite a lot of files which include it but don't actually need
      anything defined in there.  Presumably these includes were once needed for
      macros that used to live in sched.h, but moved to other header files in the
      course of cleaning it up.
      To ease the pain, this time I did not fiddle with any header files and only
      removed #includes from .c-files, which tend to cause less trouble.
      Compile tested against 2.6.20-rc2 and 2.6.20-rc2-mm2 (with offsets) on alpha,
      arm, i386, ia64, mips, powerpc, and x86_64 with allnoconfig, defconfig,
      allmodconfig, and allyesconfig as well as a few randconfigs on x86_64 and all
      configs in arch/arm/configs on arm.  I also checked that no new warnings were
      introduced by the patch (actually, some warnings are removed that were emitted
      by unnecessarily included header files).
      Signed-off-by: 's avatarTim Schmielau <tim@physik3.uni-rostock.de>
      Acked-by: 's avatarRussell King <rmk+kernel@arm.linux.org.uk>
      Signed-off-by: 's avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: 's avatarLinus Torvalds <torvalds@linux-foundation.org>
  10. 12 Jan, 2007 1 commit
    • Linus Torvalds's avatar
      Don't put "linux_banner" in the .init section · c71551ad
      Linus Torvalds authored
      It might save a few bytes after bootup, but it causes the string to be
      linked in at the end of the final vmlinux image, which defeats the whole
      point of doing all this, namely allowing some broken user-space binaries
      to search for the kernel version string in the kernel binary.
      So just remove the __init specifier.
      Cc: Olaf Hering <olaf@aepfle.de>
      Cc: Jean Delvare <khali@linux-fr.org>
      Cc: Roman Zippel <zippel@linux-m68k.org>
      Cc: Andrey Borzenkov <arvidjaar@mail.ru>
      Cc: Andrew Morton <akpm@osdl.org>
      Acked-by: 's avatarAndy Whitcroft <apw@shadowen.org>
      Signed-off-by: 's avatarLinus Torvalds <torvalds@osdl.org>
  11. 10 Jan, 2007 1 commit
  12. 11 Dec, 2006 1 commit
    • Linus Torvalds's avatar
      Make SLES9 "get_kernel_version" work on the kernel binary again · 8993780a
      Linus Torvalds authored
      As reported by Andy Whitcroft, at least the SLES9 initrd build process
      depends on getting the kernel version from the kernel binary.  It does
      that by simply trawling the binary and looking for the signature of the
      "linux_banner" string (the string "Linux version " to be exact. Which
      is really broken in itself, but whatever..)
      That got broken when the string was changed to allow /proc/version to
      change the UTS release information dynamically, and "get_kernel_version"
      thus returned "%s" (see commit a2ee8649:
      "[PATCH] Fix linux banner utsname information").
      This just restores "linux_banner" as a static string, which should fix
      the version finding.  And /proc/version simply uses a different string.
      To avoid wasting even that miniscule amount of memory, the early boot
      string should really be marked __initdata, but that just causes the same
      bug in SLES9 to re-appear, since it will then find other occurrences of
      "Linux version " first.
      Cc: Andy Whitcroft <apw@shadowen.org>
      Acked-by: 's avatarHerbert Poetzl <herbert@13thfloor.at>
      Cc: Andi Kleen <ak@suse.de>
      Cc: Andrew Morton <akpm@osdl.org>
      Cc: Steve Fox <drfickle@us.ibm.com>
      Acked-by: 's avatarOlaf Hering <olaf@aepfle.de>
      Signed-off-by: 's avatarLinus Torvalds <torvalds@osdl.org>
  13. 08 Dec, 2006 1 commit
  14. 02 Oct, 2006 1 commit
  15. 03 Jul, 2006 1 commit
    • Sam Ravnborg's avatar
      kbuild: introduce utsrelease.h · 63104eec
      Sam Ravnborg authored
      include/linux/version.h contained both actual KERNEL version
      and UTS_RELEASE that contains a subset from git SHA1 for when
      kernel was compiled as part of a git repository.
      This had the unfortunate side-effect that all files including version.h
      would be recompiled when some git changes was made due to changes SHA1.
      Split it out so we keep independent parts in separate files.
      Also update checkversion.pl script to no longer check for UTS_RELEASE.
      Signed-off-by: 's avatarSam Ravnborg <sam@ravnborg.org>
  16. 16 Apr, 2005 1 commit
    • Linus Torvalds's avatar
      Linux-2.6.12-rc2 · 1da177e4
      Linus Torvalds authored
      Initial git repository build. I'm not bothering with the full history,
      even though we have it. We can create a separate "historical" git
      archive of that later if we want to, and in the meantime it's about
      3.2GB when imported into git - space that would just make the early
      git days unnecessarily complicated, when we don't have a lot of good
      infrastructure for it.
      Let it rip!