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Dan Williams efda1b5d87 acpi, nfit, libnvdimm: fix / harden ars_status output length handling 
Given ambiguities in the ACPI 6.1 definition of the "Output (Size)"
field of the ARS (Address Range Scrub) Status command, a firmware
implementation may in practice return 0, 4, or 8 to indicate that there
is no output payload to process.

The specification states "Size of Output Buffer in bytes, including this
field.". However, 'Output Buffer' is also the name of the entire
payload, and earlier in the specification it states "Max Query ARS
Status Output Buffer Size: Maximum size of buffer (including the Status
and Extended Status fields)".

Without this fix if the BIOS happens to return 0 it causes memory
corruption as evidenced by this result from the acpi_nfit_ctl() unit
test.

 ars_status00000000: 00020000 00000000                    ........
 BUG: stack guard page was hit at ffffc90001750000 (stack is ffffc9000174c000..ffffc9000174ffff)
 kernel stack overflow (page fault): 0000 [#1] SMP DEBUG_PAGEALLOC
 task: ffff8803332d2ec0 task.stack: ffffc9000174c000
 RIP: 0010:[<ffffffff814cfe72>]  [<ffffffff814cfe72>] __memcpy+0x12/0x20
 RSP: 0018:ffffc9000174f9a8  EFLAGS: 00010246
 RAX: ffffc9000174fab8 RBX: 0000000000000000 RCX: 000000001fffff56
 RDX: 0000000000000000 RSI: ffff8803231f5a08 RDI: ffffc90001750000
 RBP: ffffc9000174fa88 R08: ffffc9000174fab0 R09: ffff8803231f54b8
 R10: 0000000000000008 R11: 0000000000000001 R12: 0000000000000000
 R13: 0000000000000000 R14: 0000000000000003 R15: ffff8803231f54a0
 FS:  00007f3a611af640(0000) GS:ffff88033ed00000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: ffffc90001750000 CR3: 0000000325b20000 CR4: 00000000000406e0
 Stack:
  ffffffffa00bc60d 0000000000000008 ffffc90000000001 ffffc9000174faac
  0000000000000292 ffffffffa00c24e4 ffffffffa00c2914 0000000000000000
  0000000000000000 ffffffff00000003 ffff880331ae8ad0 0000000800000246
 Call Trace:
  [<ffffffffa00bc60d>] ? acpi_nfit_ctl+0x49d/0x750 [nfit]
  [<ffffffffa01f4fe0>] nfit_test_probe+0x670/0xb1b [nfit_test]

Cc: <stable@vger.kernel.org>
Fixes: 747ffe11b4 ("libnvdimm, tools/testing/nvdimm: fix 'ars_status' output buffer sizing")
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
 		2016-12-06 16:08:10 -08:00
..
acpi Merge branches 'acpica-fixes', 'acpi-cppc-fixes' and 'acpi-tools-fixes' 2016-11-18 21:34:42 +01:00
asm-generic default exported asm symbols to zero 2016-12-02 08:51:22 -08:00
clocksource
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crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2016-10-10 11:19:47 +08:00
drm drm: Don't force all planes to be added to the state due to zpos 2016-10-26 18:48:05 +02:00
dt-bindings Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux 2016-10-12 11:05:23 -07:00
keys
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kvm ARM: KVM: Support vgic-v3 2016-09-22 13:22:21 +02:00
linux acpi, nfit, libnvdimm: fix / harden ars_status output length handling 2016-12-06 16:08:10 -08:00
math-emu
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media Linux 4.8 2016-10-05 16:43:53 -03:00
memory
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misc
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net Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf 2016-12-01 11:04:41 -05:00
pcmcia
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ras
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rdma Merge of primary rdma-core code for 4.9 2016-10-09 17:04:33 -07:00
rxrpc rxrpc: Add tracepoint for ACK proposal 2016-09-23 15:49:19 +01:00
scsi Merge remote-tracking branch 'mkp-scsi/4.8/scsi-fixes' into fixes 2016-09-27 22:30:51 -07:00
soc powerpc updates for 4.9 #2 2016-10-14 11:07:42 -07:00
sound ASoC: Updates for v4.9 2016-09-30 18:40:40 +02:00
target target: Make EXTENDED_COPY 0xe4 failure return COPY TARGET DEVICE NOT REACHABLE 2016-10-19 21:22:32 -07:00
trace Merge branch 'for-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup 2016-10-14 12:18:50 -07:00
uapi Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-12-02 11:45:27 -08:00
video fbdev changes for 4.9 2016-10-12 11:01:37 -07:00
xen xen: features and fixes for 4.9-rc0 2016-10-06 11:19:10 -07:00
Kbuild
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