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
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
kvm
linux	acpi, nfit, libnvdimm: fix / harden ars_status output length handling	2016-12-06 16:08:10 -08:00
math-emu
media	Linux 4.8	2016-10-05 16:43:53 -03:00
memory
misc
net	Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf	2016-12-01 11:04:41 -05:00
pcmcia
ras
rdma	Merge of primary rdma-core code for 4.9	2016-10-09 17:04:33 -07:00
rxrpc
scsi
soc	powerpc updates for 4.9 #2	2016-10-14 11:07:42 -07:00
sound
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