1. 05 Nov, 2008 1 commit
  2. 24 Jul, 2008 1 commit
  3. 09 Jul, 2008 1 commit
  4. 25 Jan, 2008 1 commit
  5. 02 Dec, 2007 1 commit
  6. 01 Nov, 2007 1 commit
  7. 19 Oct, 2007 1 commit
    • Serge E. Hallyn's avatar
      pid namespaces: define is_global_init() and is_container_init() · b460cbc5
      Serge E. Hallyn authored
      
      
      is_init() is an ambiguous name for the pid==1 check.  Split it into
      is_global_init() and is_container_init().
      
      A cgroup init has it's tsk->pid == 1.
      
      A global init also has it's tsk->pid == 1 and it's active pid namespace
      is the init_pid_ns.  But rather than check the active pid namespace,
      compare the task structure with 'init_pid_ns.child_reaper', which is
      initialized during boot to the /sbin/init process and never changes.
      
      Changelog:
      
      	2.6.22-rc4-mm2-pidns1:
      	- Use 'init_pid_ns.child_reaper' to determine if a given task is the
      	  global init (/sbin/init) process. This would improve performance
      	  and remove dependence on the task_pid().
      
      	2.6.21-mm2-pidns2:
      
      	- [Sukadev Bhattiprolu] Changed is_container_init() calls in {powerpc,
      	  ppc,avr32}/traps.c for the _exception() call to is_global_init().
      	  This way, we kill only the cgroup if the cgroup's init has a
      	  bug rather than force a kernel panic.
      
      [akpm@linux-foundation.org: fix comment]
      [sukadev@us.ibm.com: Use is_global_init() in arch/m32r/mm/fault.c]
      [bunk@stusta.de: kernel/pid.c: remove unused exports]
      [sukadev@us.ibm.com: Fix capability.c to work with threaded init]
      Signed-off-by: default avatarSerge E. Hallyn <serue@us.ibm.com>
      Signed-off-by: default avatarSukadev Bhattiprolu <sukadev@us.ibm.com>
      Acked-by: default avatarPavel Emelianov <xemul@openvz.org>
      Cc: Eric W. Biederman <ebiederm@xmission.com>
      Cc: Cedric Le Goater <clg@fr.ibm.com>
      Cc: Dave Hansen <haveblue@us.ibm.com>
      Cc: Herbert Poetzel <herbert@13thfloor.at>
      Cc: Kirill Korotaev <dev@sw.ru>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b460cbc5
  8. 22 Jul, 2007 1 commit
    • Paul Mackerras's avatar
      [POWERPC] Allow exec faults on readable areas on classic 32-bit PowerPC · 08ae6cc1
      Paul Mackerras authored
      Classic 32-bit PowerPC CPUs, and the early 64-bit PowerPC CPUs, don't
      provide a way to prevent execution from readable pages, that is, the
      MMU doesn't distinguish between data reads and instruction reads,
      although a different exception is taken for faults in data accesses
      and instruction accesses.
      
      Commit 9ba4ace3
      
      , in the course of
      fixing another bug, added a check that meant that a page fault due
      to an instruction access would fail if the vma did not have the
      VM_EXEC flag set.  This gives an inconsistent enforcement on these
      CPUs of the no-execute status of the vma (since reading from the page
      is sufficient to allow subsequent execution from it), and causes old
      versions of ppc32 glibc (2.2 and earlier) to fail, since they rely
      on executing the word before the GOT but don't have it marked
      executable.
      
      This fixes the problem by allowing execution from readable (or writable)
      areas on CPUs which do not provide separate control over data and
      instruction reads.
      Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
      Acked-by: default avatarJon Loeliger <jdl@freescale.com>
      08ae6cc1
  9. 19 Jul, 2007 1 commit
    • Nick Piggin's avatar
      mm: fault feedback #2 · 83c54070
      Nick Piggin authored
      
      
      This patch completes Linus's wish that the fault return codes be made into
      bit flags, which I agree makes everything nicer.  This requires requires
      all handle_mm_fault callers to be modified (possibly the modifications
      should go further and do things like fault accounting in handle_mm_fault --
      however that would be for another patch).
      
      [akpm@linux-foundation.org: fix alpha build]
      [akpm@linux-foundation.org: fix s390 build]
      [akpm@linux-foundation.org: fix sparc build]
      [akpm@linux-foundation.org: fix sparc64 build]
      [akpm@linux-foundation.org: fix ia64 build]
      Signed-off-by: default avatarNick Piggin <npiggin@suse.de>
      Cc: Richard Henderson <rth@twiddle.net>
      Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
      Cc: Russell King <rmk@arm.linux.org.uk>
      Cc: Ian Molton <spyro@f2s.com>
      Cc: Bryan Wu <bryan.wu@analog.com>
      Cc: Mikael Starvik <starvik@axis.com>
      Cc: David Howells <dhowells@redhat.com>
      Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
      Cc: "Luck, Tony" <tony.luck@intel.com>
      Cc: Hirokazu Takata <takata@linux-m32r.org>
      Cc: Geert Uytterhoeven <geert@linux-m68k.org>
      Cc: Roman Zippel <zippel@linux-m68k.org>
      Cc: Greg Ungerer <gerg@uclinux.org>
      Cc: Matthew Wilcox <willy@debian.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
      Cc: Richard Curnow <rc@rc0.org.uk>
      Cc: William Lee Irwin III <wli@holomorphy.com>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Jeff Dike <jdike@addtoit.com>
      Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
      Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp>
      Cc: Chris Zankel <chris@zankel.net>
      Acked-by: default avatarKyle McMartin <kyle@mcmartin.ca>
      Acked-by: default avatarHaavard Skinnemoen <hskinnemoen@atmel.com>
      Acked-by: default avatarRalf Baechle <ralf@linux-mips.org>
      Acked-by: default avatarAndi Kleen <ak@muc.de>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      [ Still apparently needs some ARM and PPC loving - Linus ]
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      83c54070
  10. 20 Jun, 2007 1 commit
  11. 14 Jun, 2007 1 commit
    • will schmidt's avatar
      [POWERPC] During VM oom condition, kill all threads in process group · effe24bd
      will schmidt authored
      
      
      We have had complaints where a threaded application is left in a bad state
      after one of it's threads is killed when we hit a VM: out_of_memory
      condition.
      
      Killing just one of the process threads can leave the application in a
      bad state, whereas killing the entire process group would allow for
      the application to restart, or be otherwise handled, and makes it very
      obvious that something has gone wrong.
      
      This change allows the entire process group to be taken down, rather than
      just the one thread.
      
      lightly tested on powerpc
      Signed-off-by: default avatarWill <will_schmidt@vnet.ibm.com>
      Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
      effe24bd
  12. 08 May, 2007 1 commit
    • Christoph Hellwig's avatar
      move die notifier handling to common code · 1eeb66a1
      Christoph Hellwig authored
      
      
      This patch moves the die notifier handling to common code.  Previous
      various architectures had exactly the same code for it.  Note that the new
      code is compiled unconditionally, this should be understood as an appel to
      the other architecture maintainer to implement support for it aswell (aka
      sprinkling a notify_die or two in the proper place)
      
      arm had a notifiy_die that did something totally different, I renamed it to
      arm_notify_die as part of the patch and made it static to the file it's
      declared and used at.  avr32 used to pass slightly less information through
      this interface and I brought it into line with the other architectures.
      
      [akpm@linux-foundation.org: build fix]
      [akpm@linux-foundation.org: fix vmalloc_sync_all bustage]
      [bryan.wu@analog.com: fix vmalloc_sync_all in nommu]
      Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      Cc: <linux-arch@vger.kernel.org>
      Cc: Russell King <rmk@arm.linux.org.uk>
      Signed-off-by: default avatarBryan Wu <bryan.wu@analog.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      1eeb66a1
  13. 02 May, 2007 1 commit
  14. 12 Nov, 2006 1 commit
  15. 29 Sep, 2006 2 commits
    • Sukadev Bhattiprolu's avatar
      [PATCH] pidspace: is_init() · f400e198
      Sukadev Bhattiprolu authored
      This is an updated version of Eric Biederman's is_init() patch.
      (http://lkml.org/lkml/2006/2/6/280
      
      ).  It applies cleanly to 2.6.18-rc3 and
      replaces a few more instances of ->pid == 1 with is_init().
      
      Further, is_init() checks pid and thus removes dependency on Eric's other
      patches for now.
      
      Eric's original description:
      
      	There are a lot of places in the kernel where we test for init
      	because we give it special properties.  Most  significantly init
      	must not die.  This results in code all over the kernel test
      	->pid == 1.
      
      	Introduce is_init to capture this case.
      
      	With multiple pid spaces for all of the cases affected we are
      	looking for only the first process on the system, not some other
      	process that has pid == 1.
      Signed-off-by: default avatarEric W. Biederman <ebiederm@xmission.com>
      Signed-off-by: default avatarSukadev Bhattiprolu <sukadev@us.ibm.com>
      Cc: Dave Hansen <haveblue@us.ibm.com>
      Cc: Serge Hallyn <serue@us.ibm.com>
      Cc: Cedric Le Goater <clg@fr.ibm.com>
      Cc: <lxc-devel@lists.sourceforge.net>
      Acked-by: default avatarPaul Mackerras <paulus@samba.org>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      f400e198
    • Jason Baron's avatar
      [PATCH] make PROT_WRITE imply PROT_READ · df67b3da
      Jason Baron authored
      
      
      Make PROT_WRITE imply PROT_READ for a number of architectures which don't
      support write only in hardware.
      
      While looking at this, I noticed that some architectures which do not
      support write only mappings already take the exact same approach.  For
      example, in arch/alpha/mm/fault.c:
      
      "
              if (cause < 0) {
                      if (!(vma->vm_flags & VM_EXEC))
                              goto bad_area;
              } else if (!cause) {
                      /* Allow reads even for write-only mappings */
                      if (!(vma->vm_flags & (VM_READ | VM_WRITE)))
                              goto bad_area;
              } else {
                      if (!(vma->vm_flags & VM_WRITE))
                              goto bad_area;
              }
      "
      
      Thus, this patch brings other architectures which do not support write only
      mappings in-line and consistent with the rest.  I've verified the patch on
      ia64, x86_64 and x86.
      
      Additional discussion:
      
      Several architectures, including x86, can not support write-only mappings.
      The pte for x86 reserves a single bit for protection and its two states are
      read only or read/write.  Thus, write only is not supported in h/w.
      
      Currently, if i 'mmap' a page write-only, the first read attempt on that page
      creates a page fault and will SEGV.  That check is enforced in
      arch/blah/mm/fault.c.  However, if i first write that page it will fault in
      and the pte will be set to read/write.  Thus, any subsequent reads to the page
      will succeed.  It is this inconsistency in behavior that this patch is
      attempting to address.  Furthermore, if the page is swapped out, and then
      brought back the first read will also cause a SEGV.  Thus, any arbitrary read
      on a page can potentially result in a SEGV.
      
      According to the SuSv3 spec, "if the application requests only PROT_WRITE, the
      implementation may also allow read access." Also as mentioned, some
      archtectures, such as alpha, shown above already take the approach that i am
      suggesting.
      
      The counter-argument to this raised by Arjan, is that the kernel is enforcing
      the write only mapping the best it can given the h/w limitations.  This is
      true, however Alan Cox, and myself would argue that the inconsitency in
      behavior, that is applications can sometimes work/sometimes fails is highly
      undesireable.  If you read through the thread, i think people, came to an
      agreement on the last patch i posted, as nobody has objected to it...
      Signed-off-by: default avatarJason Baron <jbaron@redhat.com>
      Cc: Russell King <rmk@arm.linux.org.uk>
      Cc: "Luck, Tony" <tony.luck@intel.com>
      Cc: Hugh Dickins <hugh@veritas.com>
      Cc: Roman Zippel <zippel@linux-m68k.org>
      Cc: Geert Uytterhoeven <geert@linux-m68k.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Acked-by: default avatarAndi Kleen <ak@muc.de>
      Acked-by: default avatarAlan Cox <alan@lxorguk.ukuu.org.uk>
      Cc: Arjan van de Ven <arjan@linux.intel.com>
      Acked-by: default avatarPaul Mundt <lethal@linux-sh.org>
      Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
      Cc: Ian Molton <spyro@f2s.com>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      df67b3da
  16. 30 Jun, 2006 1 commit
  17. 26 Jun, 2006 1 commit
  18. 01 Apr, 2006 1 commit
  19. 28 Mar, 2006 1 commit
  20. 09 Feb, 2006 1 commit
  21. 08 Jan, 2006 1 commit
  22. 06 Nov, 2005 1 commit
  23. 27 Oct, 2005 1 commit
  24. 26 Sep, 2005 1 commit
    • Paul Mackerras's avatar
      powerpc: Merge enough to start building in arch/powerpc. · 14cf11af
      Paul Mackerras authored
      
      
      This creates the directory structure under arch/powerpc and a bunch
      of Kconfig files.  It does a first-cut merge of arch/powerpc/mm,
      arch/powerpc/lib and arch/powerpc/platforms/powermac.  This is enough
      to build a 32-bit powermac kernel with ARCH=powerpc.
      
      For now we are getting some unmerged files from arch/ppc/kernel and
      arch/ppc/syslib, or arch/ppc64/kernel.  This makes some minor changes
      to files in those directories and files outside arch/powerpc.
      
      The boot directory is still not merged.  That's going to be interesting.
      Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
      14cf11af
  25. 17 Sep, 2005 1 commit
  26. 12 Sep, 2005 1 commit
  27. 07 Sep, 2005 1 commit
  28. 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!
      1da177e4