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  1. Oct 03, 2016
    • Xie XiuQi's avatar
      ipmi: fix crash on reading version from proc after unregisted bmc · bd85f4b3
      Xie XiuQi authored 
      

I meet a crash, which could be reproduce:
1) while true; do cat /proc/ipmi/0/version; done
2) modprobe -rv ipmi_si ipmi_msghandler ipmi_devintf

[82761.021137] IPMI BT: req2rsp=5 secs retries=2
[82761.034524] ipmi device interface
[82761.222218] ipmi_si ipmi_si.0: Found new BMC (man_id: 0x0007db, prod_id: 0x0001, dev_id: 0x01)
[82761.222230] ipmi_si ipmi_si.0: IPMI bt interface initialized
[82903.922740] BUG: unable to handle kernel NULL pointer dereference at 00000000000002d4
[82903.930952] IP: [<ffffffffa030d9e8>] smi_version_proc_show+0x18/0x40 [ipmi_msghandler]
[82903.939220] PGD 86693a067 PUD 865304067 PMD 0
[82903.943893] Thread overran stack, or stack corrupted
[82903.949034] Oops: 0000 [#1] SMP
[82903.983091] Modules linked in: ipmi_si(-) ipmi_msghandler binfmt_misc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter
...
[82904.057285]  pps_core scsi_transport_sas dm_mod vfio_iommu_type1 vfio xt_sctp nf_conntrack_proto_sctp nf_nat_proto_sctp
                nf_nat nf_conntrack sctp libcrc32c [last unloaded: ipmi_devintf]
[82904.073169] CPU: 37 PID: 28089 Comm: cat Tainted: GF          O   ---- -------   3.10.0-327.28.3.el7.x86_64 #1
[82904.083373] Hardware name: Huawei RH2288H V3/BC11HGSA0, BIOS 3.22 05/16/2016
[82904.090592] task: ffff880101cc2e00 ti: ffff880369c54000 task.ti: ffff880369c54000
[82904.098414] RIP: 0010:[<ffffffffa030d9e8>]  [<ffffffffa030d9e8>] smi_version_proc_show+0x18/0x40 [ipmi_msghandler]
[82904.109124] RSP: 0018:ffff880369c57e70  EFLAGS: 00010203
[82904.114608] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000024688470
[82904.121912] RDX: fffffffffffffff4 RSI: ffffffffa0313404 RDI: ffff8808670ce200
[82904.129218] RBP: ffff880369c57e70 R08: 0000000000019720 R09: ffffffff81204a27
[82904.136521] R10: ffff88046f803300 R11: 0000000000000246 R12: ffff880662399700
[82904.143828] R13: 0000000000000001 R14: ffff880369c57f48 R15: ffff8808670ce200
[82904.151128] FS:  00007fb70c9ca740(0000) GS:ffff88086e340000(0000) knlGS:0000000000000000
[82904.159557] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[82904.165473] CR2: 00000000000002d4 CR3: 0000000864c0c000 CR4: 00000000003407e0
[82904.172778] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[82904.180084] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[82904.187385] Stack:
[82904.189573]  ffff880369c57ee0 ffffffff81204f1a 00000000122a2427 0000000001426000
[82904.197392]  ffff8808670ce238 0000000000010000 0000000000000000 0000000000000fff
[82904.205198]  00000000122a2427 ffff880862079600 0000000001426000 ffff880369c57f48
[82904.212962] Call Trace:
[82904.219667]  [<ffffffff81204f1a>] seq_read+0xfa/0x3a0
[82904.224893]  [<ffffffff8124ce2d>] proc_reg_read+0x3d/0x80
[82904.230468]  [<ffffffff811e102c>] vfs_read+0x9c/0x170
[82904.235689]  [<ffffffff811e1b7f>] SyS_read+0x7f/0xe0
[82904.240816]  [<ffffffff81649209>] system_call_fastpath+0x16/0x1b
[82904.246991] Code: 30 a0 e8 0c 6f ef e0 5b 5d c3 66 0f 1f 84 00 00 00 00 00 0f 1f
               44 00 00 48 8b 47 78 55 48 c7 c6 04 34 31 a0 48 89 e5 48 8b 40 50 <0f>
	       b6 90 d4 02 00 00 31 c0 89 d1 83 e2 0f c0 e9 04 0f b6 c9 e8
[82904.267710] RIP  [<ffffffffa030d9e8>] smi_version_proc_show+0x18/0x40 [ipmi_msghandler]
[82904.276079]  RSP <ffff880369c57e70>
[82904.279734] CR2: 00000000000002d4
[82904.283731] ---[ end trace a69e4328b49dd7c4 ]---
[82904.328118] Kernel panic - not syncing: Fatal exception

Reading versin from /proc need bmc device struct available. So in this patch
we move add/remove_proc_entries between ipmi_bmc_register and ipmi_bmc_unregister.

Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: default avatarXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: default avatarCorey Minyard <cminyard@mvista.com>
      bd85f4b3
  3. Sep 30, 2016
    • Wei Yongjun's avatar
      ipmi/bt-bmc: remove redundant return value check of platform_get_resource() · d94655b4
      Wei Yongjun authored 
      

Remove unneeded error handling on the result of a call
to platform_get_resource() when the value is passed to
devm_ioremap_resource().

Signed-off-by: default avatarWei Yongjun <weiyongjun1@huawei.com>
Acked-by: default avatarCédric Le Goater <clg@kaod.org>
Signed-off-by: default avatarCorey Minyard <cminyard@mvista.com>
      d94655b4
    • Cédric Le Goater's avatar
      ipmi/bt-bmc: add a dependency on ARCH_ASPEED · a3e6061b
      Cédric Le Goater authored 
      

Signed-off-by: default avatarCédric Le Goater <clg@kaod.org>
Signed-off-by: default avatarCorey Minyard <cminyard@mvista.com>
      a3e6061b
    • Joel Stanley's avatar
      ipmi: Fix ioremap error handling in bt-bmc · 1a377a79
      Joel Stanley authored 
      

devm_ioremap_resource returns ERR_PTR so we can't check for NULL.

Signed-off-by: default avatarJoel Stanley <joel@jms.id.au>
Acked-by: default avatarCédric Le Goater <clg@kaod.org>
Signed-off-by: default avatarCorey Minyard <cminyard@mvista.com>
      1a377a79
    • Alistair Popple's avatar
      ipmi: add an Aspeed BT IPMI BMC driver · 54f9c4d0
      Alistair Popple authored 
      

This patch adds a simple device driver to expose the iBT interface on
Aspeed SOCs (AST2400 and AST2500) as a character device. Such SOCs are
commonly used as BMCs (BaseBoard Management Controllers) and this
driver implements the BMC side of the BT interface.

The BT (Block Transfer) interface is used to perform in-band IPMI
communication between a host and its BMC. Entire messages are buffered
before sending a notification to the other end, host or BMC, that
there is data to be read. Usually, the host emits requests and the BMC
responses but the specification provides a mean for the BMC to send
SMS Attention (BMC-to-Host attention or System Management Software
attention) messages.

For this purpose, the driver introduces a specific ioctl on the
device: 'BT_BMC_IOCTL_SMS_ATN' that can be used by the system running
on the BMC to signal the host of such an event.

The device name defaults to '/dev/ipmi-bt-host'

Signed-off-by: default avatarAlistair Popple <alistair@popple.id.au>
Signed-off-by: default avatarJeremy Kerr <jk@ozlabs.org>
Signed-off-by: default avatarJoel Stanley <joel@jms.id.au>
[clg: - checkpatch fixes
      - added a devicetree binding documentation
      - replace 'bt_host' by 'bt_bmc' to reflect that the driver is
        the BMC side of the IPMI BT interface
      - renamed the device to 'ipmi-bt-host'
      - introduced a temporary buffer to copy_{to,from}_user
      - used platform_get_irq()
      - moved the driver under drivers/char/ipmi/ but kept it as a misc
        device
      - changed the compatible cell to "aspeed,ast2400-bt-bmc"
]
Signed-off-by: default avatarCédric Le Goater <clg@kaod.org>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
[clg: - checkpatch --strict fixes
      - removed the use of devm_iounmap, devm_kfree in cleanup paths
      - introduced an atomic-t to limit opens to 1
      - introduced a mutex to protect write/read operations]
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarCédric Le Goater <clg@kaod.org>
Signed-off-by: default avatarCorey Minyard <cminyard@mvista.com>
      54f9c4d0
    • Linus Torvalds's avatar
      Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm · c6169de7
      Linus Torvalds authored 
      Pull libnvdimm fixes from Dan Williams:

 - Four fixes for "flush hint" support.

   Flush hints are addresses advertised by the ACPI 6+ NFIT (NVDIMM
   Firmware Interface Table) that when written and fenced guarantee that
   writes pending in platform write buffers (outside the cpu) have been
   flushed to media.  They might also be used by hypervisors as a
   trigger condition to flush guest-persistent memory ranges to storage.

    Fix a potential data corruption issue, a broken definition of the
    hint array, a wrong allocation size for the unit test implementation
    of the flush hint table, and missing NULL check in an error path.

    The unit test, while it did not prevent these bugs from being
    merged, at least triggered occasional crashes in advance of
    production usages.

 - Fix handling of ACPI DSM error status results.  The DSM mechanism
   allows communication with platform and memory device firmware.  We
   correctly parse known errors, but were silently ignoring others.

   Fix it to consistently fail any command with a non-zero status return
   that we otherwise do not interpret / handle.

* 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  libnvdimm, region: fix flush hint table thinko
  nfit: fail DSMs that return non-zero status by default
  libnvdimm: fix devm_nvdimm_memremap() error path
  tools/testing/nvdimm: fix allocation range for mock flush hint tables
  nvdimm: fix PHYS_PFN/PFN_PHYS mixup
      c6169de7
  5. Sep 29, 2016
  7. Sep 28, 2016
  9. Sep 26, 2016
    • Linus Torvalds's avatar
      Linux 4.8-rc8 · 08895a8b
      Linus Torvalds authored
      08895a8b
    • Linus Torvalds's avatar
      Merge tag 'trace-v4.8-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace · 4c04b4b5
      Linus Torvalds authored 
      Pull tracefs fixes from Steven Rostedt:
 "Al Viro has been looking at the tracefs code, and has pointed out some
  issues.  This contains one fix by me and one by Al.  I'm sure that
  he'll come up with more but for now I tested these patches and they
  don't appear to have any negative impact on tracing"

* tag 'trace-v4.8-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  fix memory leaks in tracing_buffers_splice_read()
  tracing: Move mutex to protect against resetting of seq data
      4c04b4b5
    • Dave Chinner's avatar
      fault_in_multipages_readable() throws set-but-unused error · 90b75db6
      Dave Chinner authored 
      When building XFS with -Werror, it now fails with:

  include/linux/pagemap.h: In function 'fault_in_multipages_readable':
  include/linux/pagemap.h:602:16: error: variable 'c' set but not used [-Werror=unused-but-set-variable]
    volatile char c;
                  ^

This is a regression caused by commit e23d4159

 ("fix
fault_in_multipages_...() on architectures with no-op access_ok()").
Fix it by re-adding the "(void)c" trick taht was previously used to make
the compiler think the variable is used.

Signed-off-by: default avatarDave Chinner <dchinner@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      90b75db6
    • Lorenzo Stoakes's avatar
      mm: check VMA flags to avoid invalid PROT_NONE NUMA balancing · 38e08854
      Lorenzo Stoakes authored 
      The NUMA balancing logic uses an arch-specific PROT_NONE page table flag
defined by pte_protnone() or pmd_protnone() to mark PTEs or huge page
PMDs respectively as requiring balancing upon a subsequent page fault.
User-defined PROT_NONE memory regions which also have this flag set will
not normally invoke the NUMA balancing code as do_page_fault() will send
a segfault to the process before handle_mm_fault() is even called.

However if access_remote_vm() is invoked to access a PROT_NONE region of
memory, handle_mm_fault() is called via faultin_page() and
__get_user_pages() without any access checks being performed, meaning
the NUMA balancing logic is incorrectly invoked on a non-NUMA memory
region.

A simple means of triggering this problem is to access PROT_NONE mmap'd
memory using /proc/self/mem which reliably results in the NUMA handling
functions being invoked when CONFIG_NUMA_BALANCING is set.

This issue was reported in bugzilla (issue 99101) which includes some
simple repro code.

There are BUG_ON() checks in do_numa_page() and do_huge_pmd_numa_page()
added at commit c0e7cad9 to avoid accidentally provoking strange
behaviour by attempting to apply NUMA balancing to pages that are in
fact PROT_NONE.  The BUG_ON()'s are consistently triggered by the repro.

This patch moves the PROT_NONE check into mm/memory.c rather than
invoking BUG_ON() as faulting in these pages via faultin_page() is a
valid reason for reaching the NUMA check with the PROT_NONE page table
flag set and is therefore not always a bug.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=99101


Reported-by: default avatarTrevor Saunders <tbsaunde@tbsaunde.org>
Signed-off-by: default avatarLorenzo Stoakes <lstoakes@gmail.com>
Acked-by: default avatarRik van Riel <riel@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      38e08854
    • Linus Torvalds's avatar
      Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus · 831e45d8
      Linus Torvalds authored 
      Pull MIPS fixes from Ralf Baechle:
 "A round of 4.8 fixes:

  MIPS generic code:
   - Add a missing ".set pop" in an early commit
   - Fix memory regions reaching top of physical
   - MAAR: Fix address alignment
   - vDSO: Fix Malta EVA mapping to vDSO page structs
   - uprobes: fix incorrect uprobe brk handling
   - uprobes: select HAVE_REGS_AND_STACK_ACCESS_API
   - Avoid a BUG warning during PR_SET_FP_MODE prctl
   - SMP: Fix possibility of deadlock when bringing CPUs online
   - R6: Remove compact branch policy Kconfig entries
   - Fix size calc when avoiding IPIs for small icache flushes
   - Fix pre-r6 emulation FPU initialisation
   - Fix delay slot emulation count in debugfs

  ATH79:
   - Fix test for error return of clk_register_fixed_factor.

  Octeon:
   - Fix kernel header to work for VDSO build.
   - Fix initialization of platform device probing.

  paravirt:
   - Fix undefined reference to smp_bootstrap"

* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
  MIPS: Fix delay slot emulation count in debugfs
  MIPS: SMP: Fix possibility of deadlock when bringing CPUs online
  MIPS: Fix pre-r6 emulation FPU initialisation
  MIPS: vDSO: Fix Malta EVA mapping to vDSO page structs
  MIPS: Select HAVE_REGS_AND_STACK_ACCESS_API
  MIPS: Octeon: Fix platform bus probing
  MIPS: Octeon: mangle-port: fix build failure with VDSO code
  MIPS: Avoid a BUG warning during prctl(PR_SET_FP_MODE, ...)
  MIPS: c-r4k: Fix size calc when avoiding IPIs for small icache flushes
  MIPS: Add a missing ".set pop" in an early commit
  MIPS: paravirt: Fix undefined reference to smp_bootstrap
  MIPS: Remove compact branch policy Kconfig entries
  MIPS: MAAR: Fix address alignment
  MIPS: Fix memory regions reaching top of physical
  MIPS: uprobes: fix incorrect uprobe brk handling
  MIPS: ath79: Fix test for error return of clk_register_fixed_factor().
      831e45d8
    • Linus Torvalds's avatar
      Merge tag 'powerpc-4.8-7' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux · 751b9a5d
      Linus Torvalds authored 
      Pull one more powerpc fix from Michael Ellerman:
 "powernv/pci: Fix m64 checks for SR-IOV and window alignment from
  Russell Currey"

* tag 'powerpc-4.8-7' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/powernv/pci: Fix m64 checks for SR-IOV and window alignment
      751b9a5d
    • Linus Torvalds's avatar
      radix tree: fix sibling entry handling in radix_tree_descend() · 8d2c0d36
      Linus Torvalds authored 
      The fixes to the radix tree test suite show that the multi-order case is
broken.  The basic reason is that the radix tree code uses tagged
pointers with the "internal" bit in the low bits, and calculating the
pointer indices was supposed to mask off those bits.  But gcc will
notice that we then use the index to re-create the pointer, and will
avoid doing the arithmetic and use the tagged pointer directly.

This cleans the code up, using the existing is_sibling_entry() helper to
validate the sibling pointer range (instead of open-coding it), and
using entry_to_node() to mask off the low tag bit from the pointer.  And
once you do that, you might as well just use the now cleaned-up pointer
directly.

[ Side note: the multi-order code isn't actually ever used in the kernel
  right now, and the only reason I didn't just delete all that code is
  that Kirill Shutemov piped up and said:

    "Well, my ext4-with-huge-pages patchset[1] uses multi-order entries.
     It also converts shmem-with-huge-pages and hugetlb to them.

     I'm okay with converting it to other mechanism, but I need
     something.  (I looked into Konstantin's RFC patchset[2].  It looks
     okay, but I don't feel myself qualified to review it as I don't
     know much about radix-tree internals.)"

  [1] http://lkml.kernel.org/r/20160915115523.29737-1-kirill.shutemov@linux.intel.com
  [2] http://lkml.kernel.org/r/147230727479.9957.1087787722571077339.stgit@zurg

 ]

Reported-by: default avatarMatthew Wilcox <mawilcox@microsoft.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Cedric Blancher <cedric.blancher@gmail.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      8d2c0d36
    • Matthew Wilcox's avatar
      radix tree test suite: Test radix_tree_replace_slot() for multiorder entries · 62fd5258
      Matthew Wilcox authored 
      

When we replace a multiorder entry, check that all indices reflect the
new value.

Also, compile the test suite with -O2, which shows other problems with
the code due to some dodgy pointer operations in the radix tree code.

Signed-off-by: default avatarMatthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      62fd5258
    • Al Viro's avatar
      fix memory leaks in tracing_buffers_splice_read() · 1ae2293d
      Al Viro authored 
      

Cc: stable@vger.kernel.org
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      1ae2293d
  11. Sep 25, 2016
  13. Sep 24, 2016