1. 10 Sep, 2015 1 commit
    • Dave Young's avatar
      kexec: split kexec_load syscall from kexec core code · 2965faa5
      Dave Young authored
      There are two kexec load syscalls, kexec_load another and kexec_file_load.
       kexec_file_load has been splited as kernel/kexec_file.c.  In this patch I
      split kexec_load syscall code to kernel/kexec.c.
      
      And add a new kconfig option KEXEC_CORE, so we can disable kexec_load and
      use kexec_file_load only, or vice verse.
      
      The original requirement is from Ted Ts'o, he want kexec kernel signature
      being checked with CONFIG_KEXEC_VERIFY_SIG enabled.  But kexec-tools use
      kexec_load syscall can bypass the checking.
      
      Vivek Goyal proposed to create a common kconfig option so user can compile
      in only one syscall for loading kexec kernel.  KEXEC/KEXEC_FILE selects
      KEXEC_CORE so that old config files still work.
      
      Because there's general code need CONFIG_KEXEC_CORE, so I updated all the
      architecture Kconfig with a new option KEXEC_CORE, and let KEXEC selects
      KEXEC_CORE in arch Kconfig.  Also updated general kernel code with to
      kexec_load syscall.
      
      [akpm@linux-foundation.org: coding-style fixes]
      Signed-off-by: default avatarDave Young <dyoung@redhat.com>
      Cc: Eric W. Biederman <ebiederm@xmission.com>
      Cc: Vivek Goyal <vgoyal@redhat.com>
      Cc: Petr Tesarik <ptesarik@suse.cz>
      Cc: Theodore Ts'o <tytso@mit.edu>
      Cc: Josh Boyer <jwboyer@fedoraproject.org>
      Cc: David Howells <dhowells@redhat.com>
      Cc: Geert Uytterhoeven <geert@linux-m68k.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      2965faa5
  2. 13 Oct, 2014 1 commit
  3. 08 Aug, 2014 3 commits
    • David Engraf's avatar
      initramfs: add write error checks · 9687fd91
      David Engraf authored
      On a system with low memory extracting the initramfs may fail.  If this
      happens the user gets "Failed to execute /init" instead of an initramfs
      error.
      
      Check return value of sys_write and call error() when the write was
      incomplete or failed.
      Signed-off-by: default avatarDavid Engraf <david.engraf@sysgo.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      9687fd91
    • Yinghai Lu's avatar
      initramfs: support initramfs that is bigger than 2GiB · d97b07c5
      Yinghai Lu authored
      Now with 64bit bzImage and kexec tools, we support ramdisk that size is
      bigger than 2g, as we could put it above 4G.
      
      Found compressed initramfs image could not be decompressed properly.  It
      turns out that image length is int during decompress detection, and it
      will become < 0 when length is more than 2G.  Furthermore, during
      decompressing len as int is used for inbuf count, that has problem too.
      
      Change len to long, that should be ok as on 32 bit platform long is
      32bits.
      
      Tested with following compressed initramfs image as root with kexec.
      	gzip, bzip2, xz, lzma, lzop, lz4.
      run time for populate_rootfs():
         size        name       Nehalem-EX  Westmere-EX  Ivybridge-EX
       9034400256 root_img     :   26s           24s          30s
       3561095057 root_img.lz4 :   28s           27s          27s
       3459554629 root_img.lzo :   29s           29s          28s
       3219399480 root_img.gz  :   64s           62s          49s
       2251594592 root_img.xz  :  262s          260s         183s
       2226366598 root_img.lzma:  386s          376s         277s
       2901482513 root_img.bz2 :  635s          599s
      Signed-off-by: default avatarYinghai Lu <yinghai@kernel.org>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Rashika Kheria <rashika.kheria@gmail.com>
      Cc: Josh Triplett <josh@joshtriplett.org>
      Cc: Kyungsik Lee <kyungsik.lee@lge.com>
      Cc: P J P <ppandit@redhat.com>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
      Cc: "Daniel M. Weeks" <dan@danweeks.net>
      Cc: Alexandre Courbot <acourbot@nvidia.com>
      Cc: Jan Beulich <JBeulich@suse.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      d97b07c5
    • Yinghai Lu's avatar
      initramfs: support initrd that is bigger than 2GiB · 38747439
      Yinghai Lu authored
      When initrd (compressed or not) is used, kernel report data corrupted with
      /dev/ram0.
      
      The root cause:
      During initramfs checking, if it is initrd, it will be transferred to
      /initrd.image with sys_write.
      sys_write only support 2G-4K write, so if the initrd ram is more than
      that, /initrd.image will not complete at all.
      
      Add local xwrite to loop calling sys_write to workaround the problem.
      
      Also need to use xwrite in write_buffer() to handle:
      image is uncompressed cpio and there is one big file (>2G) in it.
         unpack_to_rootfs ===> write_buffer ===> actions[]/do_copy
      
      At the same time, we don't need to worry about sys_read/sys_write in
      do_mounts_rd.c::crd_load.  As decompressor will have fill/flush and local
      buffer that is smaller than 2G.
      
      Test with uncompressed initrd, and compressed ones with gz, bz2, lzma,xz,
      lzop.
      Signed-off-by: default avatarYinghai Lu <yinghai@kernel.org>
      Acked-by: default avatarH. Peter Anvin <hpa@zytor.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Geert Uytterhoeven <geert@linux-m68k.org>
      Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
      Cc: "Daniel M. Weeks" <dan@danweeks.net>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      38747439
  4. 07 Apr, 2014 1 commit
  5. 23 Jan, 2014 1 commit
  6. 18 Jan, 2013 1 commit
    • Tejun Heo's avatar
      init, block: try to load default elevator module early during boot · bb813f4c
      Tejun Heo authored
      This patch adds default module loading and uses it to load the default
      block elevator.  During boot, it's called right after initramfs or
      initrd is made available and right before control is passed to
      userland.  This ensures that as long as the modules are available in
      the usual places in initramfs, initrd or the root filesystem, the
      default modules are loaded as soon as possible.
      
      This will replace the on-demand elevator module loading from elevator
      init path.
      
      v2: Fixed build breakage when !CONFIG_BLOCK.  Reported by kbuild test
          robot.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Cc: Jens Axboe <axboe@kernel.dk>
      Cc: Arjan van de Ven <arjan@linux.intel.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Alex Riesen <raa.lkml@gmail.com>
      Cc: Fengguang We <fengguang.wu@intel.com>
      bb813f4c
  7. 31 May, 2012 1 commit
  8. 03 Jan, 2012 1 commit
  9. 26 Oct, 2010 1 commit
  10. 29 Sep, 2010 1 commit
    • Hendrik Brueckner's avatar
      initramfs: fix initramfs size calculation · ffe8018c
      Hendrik Brueckner authored
      The size of a built-in initramfs is calculated in init/initramfs.c by
      "__initramfs_end - __initramfs_start".  Those symbols are defined in the
      linker script include/asm-generic/vmlinux.lds.h:
      
      #define INIT_RAM_FS                                                     \
              . = ALIGN(PAGE_SIZE);                                           \
              VMLINUX_SYMBOL(__initramfs_start) = .;                          \
              *(.init.ramfs)                                                  \
              VMLINUX_SYMBOL(__initramfs_end) = .;
      
      If the initramfs file has an odd number of bytes, the "__initramfs_end"
      symbol points to an odd address, for example, the symbols in the
      System.map might look like:
      
          0000000000572000 T __initramfs_start
          00000000005bcd05 T __initramfs_end	  <-- odd address
      
      At least on s390 this causes a problem:
      
      Certain s390 instructions, especially instructions for loading addresses
      (larl) or branch addresses must be on even addresses.  The compiler loads
      the symbol addresses with the "larl" instruction.  This instruction sets
      the last bit to 0 and, therefore, for odd size files, the calculated size
      is one byte less than it should be:
      
          0000000000540a9c <populate_rootfs>:
            540a9c:     eb cf f0 78 00 24       stmg    %r12,%r15,120(%r15),
            540aa2:     c0 10 00 01 8a af       larl    %r1,572000 <__initramfs_start>
            540aa8:     c0 c0 00 03 e1 2e       larl    %r12,5bcd04 <initramfs_end>
                                                        (Instead of  5bcd05)
            ...
            540abe:     1b c1                   sr      %r12,%r1
      
      To fix the problem, this patch introduces the global variable
      __initramfs_size, which is calculated in the "usr/initramfs_data.S" file.
      The populate_rootfs() function can then use the start marker of the
      .init.ramfs section and the value of __initramfs_size for loading the
      initramfs.  Because the start marker and size is sufficient, the
      __initramfs_end symbol is no longer needed and is removed.
      Signed-off-by: default avatarMichael Holzheu <holzheu@linux.vnet.ibm.com>
      Signed-off-by: default avatarHendrik Brueckner <brueckner@linux.vnet.ibm.com>
      Reviewed-by: default avatarWANG Cong <xiyou.wangcong@gmail.com>
      Acked-by: default avatarMichal Marek <mmarek@suse.cz>
      Acked-by: default avatar"H. Peter Anvin" <hpa@zytor.com>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarMichal Marek <mmarek@suse.cz>
      ffe8018c
  11. 24 Apr, 2010 1 commit
  12. 06 Mar, 2010 1 commit
  13. 15 Dec, 2009 1 commit
  14. 06 May, 2009 1 commit
  15. 13 Apr, 2009 2 commits
  16. 02 Apr, 2009 1 commit
  17. 28 Mar, 2009 1 commit
  18. 14 Jan, 2009 1 commit
    • H. Peter Anvin's avatar
      init: make initrd/initramfs decompression failure a KERN_EMERG event · 73310a16
      H. Peter Anvin authored
      Impact: More consistent behaviour, avoid policy in the kernel
      
      Upgrade/downgrade initrd/initramfs decompression failure from
      inconsistently a panic or a KERN_ALERT message to a KERN_EMERG event.
      It is, however, possible do design a system which can recover from
      this (using the kernel builtin code and/or the internal initramfs),
      which means this is policy, not a technical necessity.
      
      A good way to handle this would be to have a panic-level=X option, to
      force a panic on a printk above a certain level.  That is a separate
      patch, however.
      Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
      73310a16
  19. 12 Jan, 2009 1 commit
  20. 10 Jan, 2009 1 commit
    • Ingo Molnar's avatar
      bzip2/lzma: make flush_buffer() unconditional · 736f9323
      Ingo Molnar authored
      Impact: build fix
      
      flush_buffer() is used unconditionally:
      
        init/initramfs.c:456: error: 'flush_buffer' undeclared (first use in this function)
        init/initramfs.c:456: error: (Each undeclared identifier is reported only once
        init/initramfs.c:456: error: for each function it appears in.)
      
      So remove the decompressor #ifdefs from around it.
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      736f9323
  21. 08 Jan, 2009 2 commits
    • H. Peter Anvin's avatar
      bzip2/lzma: centralize format detection · 889c92d2
      H. Peter Anvin authored
      Centralize the compression format detection to a common routine in the
      lib directory, and use it for both initramfs and initrd.
      Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
      889c92d2
    • David Howells's avatar
      NOMMU: Support XIP on initramfs · cb6ff208
      David Howells authored
      Support XIP on files unpacked from the initramfs image on NOMMU systems.  This
      simply requires the length of the file to be preset so that the ramfs fs can
      attempt to garner sufficient contiguous storage to store the file (NOMMU mmap
      can only map contiguous RAM).
      
      All the other bits to do XIP on initramfs files are present:
      
       (1) ramfs's truncate attempts to allocate a contiguous run of pages when a
           file is truncated upwards from nothing.
      
       (2) ramfs sets BDI on its files to indicate direct mapping is possible, and
           that its files can be mapped for read, write and exec.
      
       (3) NOMMU mmap() will use the above bits to determine that it can do XIP.
           Possibly this needs better controls, because it will _always_ try and do
           XIP.
      
      One disadvantage of this very simplistic approach is that sufficient space
      will be allocated to store the whole file, and not just the bit that would be
      XIP'd.  To deal with this, though, the initramfs unpacker would have to be
      able to parse the file contents.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Acked-by: default avatarPaul Mundt <lethal@linux-sh.org>
      cb6ff208
  22. 07 Jan, 2009 1 commit
    • Alain Knaff's avatar
      bzip2/lzma: fix built-in initramfs vs CONFIG_RD_GZIP · a26ee60f
      Alain Knaff authored
      Impact: Resolves build failures in some configurations
      
      Makes it possible to disable CONFIG_RD_GZIP . In that case, the
      built-in initramfs will be compressed by whatever compressor is
      available (bzip2 or lzma) or left uncompressed if none is available.
      
      It also removes a couple of warnings which occur when no ramdisk
      compression at all is chosen.
      
      It also restores the select ZLIB_INFLATE in drivers/block/Kconfig
      which somehow came missing. This is needed to activate compilation of
      the stuff in zlib_deflate.
      Signed-off-by: default avatarAlain Knaff <alain@knaff.lu>
      Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
      a26ee60f
  23. 04 Jan, 2009 1 commit
    • Alain Knaff's avatar
      bzip2/lzma: config and initramfs support for bzip2/lzma decompression · 30d65dbf
      Alain Knaff authored
      Impact: New code for initramfs decompression, new features
      
      This is the second part of the bzip2/lzma patch
      
      The bzip patch is based on an idea by Christian Ludwig, includes support for
      compressing the kernel with bzip2 or lzma rather than gzip. Both
      compressors give smaller sizes than gzip.  Lzma's decompresses faster
      than bzip2.
      
      It also supports ramdisks and initramfs' compressed using these two
      compressors.
      
      The functionality has been successfully used for a couple of years by
      the udpcast project
      
      This version applies to "tip" kernel 2.6.28
      
      This part contains:
      - support for new compressions (bzip2 and lzma) in initramfs and
      old-style ramdisk
      - config dialog for kernel compression (but new kernel compressions
      not yet supported)
      Signed-off-by: default avatarAlain Knaff <alain@knaff.lu>
      Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
      30d65dbf
  24. 16 Oct, 2008 1 commit
    • Nye Liu's avatar
      initramfs: add option to preserve mtime from initramfs cpio images · 889d51a1
      Nye Liu authored
      When unpacking the cpio into the initramfs, mtimes are not preserved by
      default.  This patch adds an INITRAMFS_PRESERVE_MTIME option that allows
      mtimes stored in the cpio image to be used when constructing the
      initramfs.
      
      For embedded applications that run exclusively out of the initramfs, this
      is invaluable:
      
      When building embedded application initramfs images, its nice to know when
      the files were actually created during the build process - that makes it
      easier to see what files were modified when so we can compare the files
      that are being used on the image with the files used during the build
      process.  This might help (for example) to determine if the target system
      has all the updated files you expect to see w/o having to check MD5s etc.
      
      In our environment, the whole system runs off the initramfs partition, and
      seeing the modified times of the shared libraries (for example) helps us
      find bugs that may have been introduced by the build system incorrectly
      propogating outdated shared libraries into the image.
      
      Similarly, many of the initializion/configuration files in /etc might be
      dynamically built by the build system, and knowing when they were modified
      helps us sanity check whether the target system has the "latest" files
      etc.
      
      Finally, we might use last modified times to determine whether a hot fix
      should be applied or not to the running ramfs.
      Signed-off-by: default avatarNye Liu <nyet@nyet.org>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      889d51a1
  25. 25 Jul, 2008 1 commit
    • Thomas Petazzoni's avatar
      inflate: refactor inflate malloc code · 2d6ffcca
      Thomas Petazzoni authored
      Inflate requires some dynamic memory allocation very early in the boot
      process and this is provided with a set of four functions:
      malloc/free/gzip_mark/gzip_release.
      
      The old inflate code used a mark/release strategy rather than implement
      free.  This new version instead keeps a count on the number of outstanding
      allocations and when it hits zero, it resets the malloc arena.
      
      This allows removing all the mark and release implementations and unifying
      all the malloc/free implementations.
      
      The architecture-dependent code must define two addresses:
       - free_mem_ptr, the address of the beginning of the area in which
         allocations should be made
       - free_mem_end_ptr, the address of the end of the area in which
         allocations should be made. If set to 0, then no check is made on
         the number of allocations, it just grows as much as needed
      
      The architecture-dependent code can also provide an arch_decomp_wdog()
      function call.  This function will be called several times during the
      decompression process, and allow to notify the watchdog that the system is
      still running.  If an architecture provides such a call, then it must
      define ARCH_HAS_DECOMP_WDOG so that the generic inflate code calls
      arch_decomp_wdog().
      
      Work initially done by Matt Mackall, updated to a recent version of the
      kernel and improved by me.
      
      [akpm@linux-foundation.org: coding-style fixes]
      Signed-off-by: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
      Cc: Matt Mackall <mpm@selenic.com>
      Cc: Richard Henderson <rth@twiddle.net>
      Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
      Cc: Mikael Starvik <mikael.starvik@axis.com>
      Cc: Jesper Nilsson <jesper.nilsson@axis.com>
      Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
      Cc: David Howells <dhowells@redhat.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Acked-by: default avatarPaul Mundt <lethal@linux-sh.org>
      Acked-by: default avatarYoshinori Sato <ysato@users.sourceforge.jp>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      2d6ffcca
  26. 29 Apr, 2008 1 commit
  27. 15 Mar, 2008 1 commit
    • Linus Torvalds's avatar
      ACPI: Remove ACPI_CUSTOM_DSDT_INITRD option · 9a9e0d68
      Linus Torvalds authored
      This essentially reverts commit 71fc47a9
      ("ACPI: basic initramfs DSDT override support"), because the code simply
      isn't ready.
      
      It did ugly things to the init sequence to populate the rootfs image
      early, but that just ended up showing other problems with the whole
      approach.  The fact is, the VFS layer simply isn't initialized this
      early, and the relevant ACPI code should either run much later, or this
      shouldn't be done at all.
      
      For 2.6.25, we'll just pick the latter option.  We can revisit this
      concept later if necessary.
      
      Cc: Dave Hansen <haveblue@us.ibm.com>
      Cc: Tilman Schmidt <tilman@imap.cc>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Thomas Renninger <trenn@suse.de>
      Cc: Eric Piel <eric.piel@tremplin-utc.net>
      Cc: Len Brown <len.brown@intel.com>
      Cc: Christoph Hellwig <hch@infradead.org>
      Cc: Markus Gaugusch <dsdt@gaugusch.at>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      9a9e0d68
  28. 06 Feb, 2008 2 commits
  29. 26 Jul, 2007 1 commit
  30. 11 Feb, 2007 1 commit
  31. 11 Dec, 2006 1 commit
  32. 07 Dec, 2006 1 commit
  33. 26 Jun, 2006 1 commit
  34. 15 May, 2006 1 commit
  35. 26 Mar, 2006 1 commit