The vmw_view_cmd_to_type() function returns vmw_view_max (3) on error.
It's one element beyond the end of the vmw_view_cotables[] table.
My read on this is that it's possible to hit this failure. header->id
comes from vmw_cmd_check() and it's a user controlled number between
1040 and 1225 so we can hit that error. But I don't have the hardware
to test this code.
Fixes: d80efd5cb3 ("drm/vmwgfx: Initial DX support")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Cc: <stable@vger.kernel.org>
Buffer objects need to be either pinned or reserved while a map is active,
that's not the case here, so avoid caching the framebuffer map.
This will cause increasing mapping activity mainly when we don't do
page flipping.
This fixes occasional garbage filled screens when the framebuffer has been
evicted after the map.
Since in-kernel mapping of whole buffer objects is error-prone on 32-bit
architectures and also quite inefficient, we will revisit this later.
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
Cc: <stable@vger.kernel.org>
Pull parisc fixes from Helge Deller:
- Many small fixes to show the real physical addresses of devices
instead of hashed addresses.
- One important fix to unbreak 32-bit SMP support: We forgot to 16-byte
align the spinlocks in the assembler code.
- Qemu support: The host will get a chance to sleep when the parisc
guest is idle. We use the same mechanism as the power architecture by
overlaying the "or %r10,%r10,%r10" instruction which is simply a nop
on real hardware.
* 'parisc-4.15-3' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
parisc: qemu idle sleep support
parisc: Fix alignment of pa_tlb_lock in assembly on 32-bit SMP kernel
parisc: Show unhashed EISA EEPROM address
parisc: Show unhashed HPA of Dino chip
parisc: Show initial kernel memory layout unhashed
parisc: Show unhashed hardware inventory
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Merge tag 'apparmor-pr-2018-01-07' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor
Pull apparmor fix from John Johansen:
"This fixes a regression when the kernel feature set is reported as
supporting mount and policy is pinned to a feature set that does not
support mount mediation"
* tag 'apparmor-pr-2018-01-07' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor:
apparmor: fix regression in mount mediation when feature set is pinned
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Merge tag 'led_fixes_for_4.15-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds
Pull LED fix from Jacek Anaszewski:
"The commit 2b83ff96f5 for 4.15-rc6, which was fixing LED brightness
setting after clearing delay_off broke the behavior on any alteration
of delay_on{off} properties, due to use of a LED core helper that does
too much for this particular case"
* tag 'led_fixes_for_4.15-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds:
leds: core: Fix regression caused by commit 2b83ff96f5
Commit 2b83ff96f5 ("led: core: Fix brightness setting when setting delay_off=0")
replaced del_timer_sync(&led_cdev->blink_timer) with led_stop_software_blink()
in led_blink_set(), which additionally clears LED_BLINK_SW flag as well as
zeroes blink_delay_on and blink_delay_off properties of the struct led_classdev.
Cleansing of the latter ones wasn't required to fix the original issue but
wasn't considered harmful. It nonetheless turned out to be so in case when
pointer to one or both props is passed to led_blink_set() like in the
ledtrig-timer.c. In such cases zeroes are passed later in delay_on and/or
delay_off arguments to led_blink_setup(), which results either in stopping
the software blinking or setting blinking frequency always to 1Hz.
Avoid using led_stop_software_blink() and add a single call required
to clear LED_BLINK_SW flag, which was the only needed modification to
fix the original issue.
Fixes 2b83ff96f5 ("led: core: Fix brightness setting when setting delay_off=0")
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Pull vfs fixes from Al Viro:
- untangle sys_close() abuses in xt_bpf
- deal with register_shrinker() failures in sget()
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
fix "netfilter: xt_bpf: Fix XT_BPF_MODE_FD_PINNED mode of 'xt_bpf_info_v1'"
sget(): handle failures of register_shrinker()
mm,vmscan: Make unregister_shrinker() no-op if register_shrinker() failed.
s390:
* Two fixes for potential bitmap overruns in the cmma migration code
x86:
* Clear guest provided GPRs to defeat the Project Zero PoC for CVE
2017-5715
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull KVM fixes from Radim Krčmář:
"s390:
- Two fixes for potential bitmap overruns in the cmma migration code
x86:
- Clear guest provided GPRs to defeat the Project Zero PoC for CVE
2017-5715"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
kvm: vmx: Scrub hardware GPRs at VM-exit
KVM: s390: prevent buffer overrun on memory hotplug during migration
KVM: s390: fix cmma migration for multiple memory slots
In the current driver, OOB bytes are accessed in raw mode, and when a
page access is done with NDCR_SPARE_EN set and NDCR_ECC_EN cleared, the
driver must read the whole spare area (64 bytes in case of a 2k page,
16 bytes for a 512 page). The driver was only reading the free OOB
bytes, which was leaving some unread data in the FIFO and was somehow
leading to a timeout.
We could patch the driver to read ->spare_size + ->ecc_size instead of
just ->spare_size when READOOB is requested, but we'd better make
in-band and OOB accesses consistent.
Since the driver is always accessing in-band data in non-raw mode (with
the ECC engine enabled), we should also access OOB data in this mode.
That's particularly useful when using the BCH engine because in this
mode the free OOB bytes are also ECC protected.
Fixes: 43bcfd2bb2 ("mtd: nand: pxa3xx: Add driver-specific ECC BCH support")
Cc: stable@vger.kernel.org
Reported-by: Sean Nyekjær <sean.nyekjaer@prevas.dk>
Tested-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Tested-by: Sean Nyekjaer <sean.nyekjaer@prevas.dk>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Richard Weinberger <richard@nod.at>
Just one fix to correctly return SEGV_ACCERR when we take a SEGV on a mapped
region. The bug was introduced in the refactoring of the page fault handler we
did in the previous release.
Thanks to:
John Sperbeck.
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Merge tag 'powerpc-4.15-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc fix from Michael Ellerman:
"Just one fix to correctly return SEGV_ACCERR when we take a SEGV on a
mapped region. The bug was introduced in the refactoring of the page
fault handler we did in the previous release.
Thanks to John Sperbeck"
* tag 'powerpc-4.15-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
powerpc/mm: Fix SEGV on mapped region to return SEGV_ACCERR
Add qemu idle sleep support when running under qemu with SeaBIOS PDC
firmware.
Like the power architecture we use the "or" assembler instructions,
which translate to nops on real hardware, to indicate that qemu shall
idle sleep.
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: Richard Henderson <rth@twiddle.net>
CC: stable@vger.kernel.org # v4.9+
Pull input fixes from Dmitry Torokhov:
"Just a few driver fixups, nothing exciting"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
Input: xen-kbdfront - do not advertise multi-touch pressure support
Input: hideep - fix compile error due to missing include file
Input: elants_i2c - do not clobber interrupt trigger on x86
Input: joystick/analog - riscv has get_cycles()
Input: elantech - add new icbody type 15
Input: ims-pcu - fix typo in the error message
When the mount code was refactored for Labels it was not correctly
updated to check whether policy supported mediation of the mount
class. This causes a regression when the kernel feature set is
reported as supporting mount and policy is pinned to a feature set
that does not support mount mediation.
BugLink: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=882697#41
Fixes: 2ea3ffb778 ("apparmor: add mount mediation")
Reported-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
Cc: Stable <stable@vger.kernel.org>
Signed-off-by: John Johansen <john.johansen@canonical.com>
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Merge tag 'for-4.15-rc7-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
Pull btrfs fixes from David Sterba:
"We have two more fixes for 4.15, both aimed for stable.
The leak fix is obvious, the second patch fixes a bug revealed by the
refcount API, when it behaves differently than previous atomic_t and
reports refs going from 0 to 1 in one case"
* tag 'for-4.15-rc7-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
btrfs: fix refcount_t usage when deleting btrfs_delayed_nodes
btrfs: Fix flush bio leak
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Merge tag 'mfd-fixes-4.15-1' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd
Pull MFD fix from Lee Jones:
"Late bugfix to plug a leak in rtsx_pcr"
* tag 'mfd-fixes-4.15-1' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd:
mfd: rtsx: Release IRQ during shutdown
Pull more x86 pti fixes from Thomas Gleixner:
"Another small stash of fixes for fallout from the PTI work:
- Fix the modules vs. KASAN breakage which was caused by making
MODULES_END depend of the fixmap size. That was done when the cpu
entry area moved into the fixmap, but now that we have a separate
map space for that this is causing more issues than it solves.
- Use the proper cache flush methods for the debugstore buffers as
they are mapped/unmapped during runtime and not statically mapped
at boot time like the rest of the cpu entry area.
- Make the map layout of the cpu_entry_area consistent for 4 and 5
level paging and fix the KASLR vaddr_end wreckage.
- Use PER_CPU_EXPORT for per cpu variable and while at it unbreak
nvidia gfx drivers by dropping the GPL export. The subject line of
the commit tells it the other way around, but I noticed that too
late.
- Fix the ASM alternative macros so they can be used in the middle of
an inline asm block.
- Rename the BUG_CPU_INSECURE flag to BUG_CPU_MELTDOWN so the attack
vector is properly identified. The Spectre mitigations will come
with their own bug bits later"
* 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/pti: Rename BUG_CPU_INSECURE to BUG_CPU_MELTDOWN
x86/alternatives: Add missing '\n' at end of ALTERNATIVE inline asm
x86/tlb: Drop the _GPL from the cpu_tlbstate export
x86/events/intel/ds: Use the proper cache flush method for mapping ds buffers
x86/kaslr: Fix the vaddr_end mess
x86/mm: Map cpu_entry_area at the same place on 4/5 level
x86/mm: Set MODULES_END to 0xffffffffff000000
Pull EFI updates from Thomas Gleixner:
- A fix for a add_efi_memmap parameter regression which ensures that
the parameter is parsed before it is used.
- Reinstate the virtual capsule mapping as the cached copy turned out
to break Quark and other things
- Remove Matt Fleming as EFI co-maintainer. He stepped back a few days
ago. Thanks Matt for all your great work!
* 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
MAINTAINERS: Remove Matt Fleming as EFI co-maintainer
efi/capsule-loader: Reinstate virtual capsule mapping
x86/efi: Fix kernel param add_efi_memmap regression
Pull s390 fixes from Martin Schwidefsky:
"Four bug fixes"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
s390/dasd: fix wrongly assigned configuration data
s390: fix preemption race in disable_sacf_uaccess
s390/sclp: disable FORTIFY_SOURCE for early sclp code
s390/pci: handle insufficient resources during dma tlb flush
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Merge tag 'for-linus-4.15-rc7-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen fix from Juergen Gross:
"One minor fix adjusting the kmalloc flags in the new pvcalls driver
added in rc1"
* tag 'for-linus-4.15-rc7-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
xen/pvcalls: use GFP_ATOMIC under spin lock
Pull crypto fixes from Herbert Xu:
"This fixes the following issues:
- racy use of ctx->rcvused in af_alg
- algif_aead crash in chacha20poly1305
- freeing bogus pointer in pcrypt
- build error on MIPS in mpi
- memory leak in inside-secure
- memory overwrite in inside-secure
- NULL pointer dereference in inside-secure
- state corruption in inside-secure
- build error without CRYPTO_GF128MUL in chelsio
- use after free in n2"
* 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
crypto: inside-secure - do not use areq->result for partial results
crypto: inside-secure - fix request allocations in invalidation path
crypto: inside-secure - free requests even if their handling failed
crypto: inside-secure - per request invalidation
lib/mpi: Fix umul_ppmm() for MIPS64r6
crypto: pcrypt - fix freeing pcrypt instances
crypto: n2 - cure use after free
crypto: af_alg - Fix race around ctx->rcvused by making it atomic_t
crypto: chacha20poly1305 - validate the digest size
crypto: chelsio - select CRYPTO_GF128MUL
Merge misc fixes from Andrew Morton:
"9 fixes"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
mailmap: update Mark Yao's email address
userfaultfd: clear the vma->vm_userfaultfd_ctx if UFFD_EVENT_FORK fails
mm/sparse.c: wrong allocation for mem_section
mm/zsmalloc.c: include fs.h
mm/debug.c: provide useful debugging information for VM_BUG
kernel/exit.c: export abort() to modules
mm/mprotect: add a cond_resched() inside change_pmd_range()
kernel/acct.c: fix the acct->needcheck check in check_free_space()
mm: check pfn_valid first in zero_resv_unavail
Descriptor table is a shared object; it's not a place where you can
stick temporary references to files, especially when we don't need
an opened file at all.
Cc: stable@vger.kernel.org # v4.14
Fixes: 98589a0998 ("netfilter: xt_bpf: Fix XT_BPF_MODE_FD_PINNED mode of 'xt_bpf_info_v1'")
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Guest GPR values are live in the hardware GPRs at VM-exit. Do not
leave any guest values in hardware GPRs after the guest GPR values are
saved to the vcpu_vmx structure.
This is a partial mitigation for CVE 2017-5715 and CVE 2017-5753.
Specifically, it defeats the Project Zero PoC for CVE 2017-5715.
Suggested-by: Eric Northup <digitaleric@google.com>
Signed-off-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Eric Northup <digitaleric@google.com>
Reviewed-by: Benjamin Serebrin <serebrin@google.com>
Reviewed-by: Andrew Honig <ahonig@google.com>
[Paolo: Add AMD bits, Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Use the name associated with the particular attack which needs page table
isolation for mitigation.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: David Woodhouse <dwmw@amazon.co.uk>
Cc: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
Cc: Jiri Koshina <jikos@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Andi Lutomirski <luto@amacapital.net>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Paul Turner <pjt@google.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Greg KH <gregkh@linux-foundation.org>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Kees Cook <keescook@google.com>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/alpine.DEB.2.20.1801051525300.1724@nanos
Where an ALTERNATIVE is used in the middle of an inline asm block, this
would otherwise lead to the following instruction being appended directly
to the trailing ".popsection", and a failed compile.
Fixes: 9cebed423c ("x86, alternative: Use .pushsection/.popsection")
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: gnomes@lxorguk.ukuu.org.uk
Cc: Rik van Riel <riel@redhat.com>
Cc: ak@linux.intel.com
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Paul Turner <pjt@google.com>
Cc: Jiri Kosina <jikos@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Kees Cook <keescook@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linux-foundation.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20180104143710.8961-8-dwmw@amazon.co.uk
'Commit cc27b735ad ("PCI/portdrv: Turn off PCIe services during
shutdown")' revealed a resource leak in rtsx_pci driver during shutdown.
Issue shows up as a warning during shutdown as follows:
remove_proc_entry: removing non-empty directory 'irq/17', leaking at least
'rtsx_pci'
WARNING: CPU: 0 PID: 1578 at fs/proc/generic.c:572
remove_proc_entry+0x11d/0x130
Modules linked in <long list but none that are out-of-tree>
...
Call Trace:
unregister_irq_proc
free_desc
irq_free_descs
mp_unmap_irq
acpi_unregister_gsi_apic
acpi_pci_irq_disable
do_pci_disable_device
pci_disable_device
device_shutdown
kernel_restart
Sys_reboot
Even though rtsx_pci driver implements a shutdown callback, it is not
releasing the interrupt that it registered during probe. This is causing
the ACPI layer to complain that the shared IRQ is in use while freeing
IRQ.
This code releases the IRQ to prevent resource leak and eliminate the
warning.
Fixes: cc27b735ad ("PCI/portdrv: Turn off PCIe services during shutdown")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=198141
Reported-by: Chris Clayton <chris2553@googlemail.com>
Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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Merge tag 'drm-fixes-for-v4.15-rc7' of git://people.freedesktop.org/~airlied/linux
Pull drm fixes from Dave Airlie:
"Just collecting some fixes to finish my hoildays :-).
A few fixes for i915 (one documentation build fix), one ttm fix, one
AMD display fix, one omapdrm fix, and a set of armada fixes from
Russell.
All seem pretty small, you can now return to your latest security news
site"
* tag 'drm-fixes-for-v4.15-rc7' of git://people.freedesktop.org/~airlied/linux:
drm/i915: Apply Display WA #1183 on skl, kbl, and cfl
drm/ttm: check the return value of kzalloc
drm/amd/display: call set csc_default if enable adjustment is false
docs: fix, intel_guc_loader.c has been moved to intel_guc_fw.c
omapdrm/dss/hdmi4_cec: fix interrupt handling
documentation/gpu/i915: fix docs build error after file rename
drm/i915: Put all non-blocking modesets onto an ordered wq
drm/i915: Disable DC states around GMBUS on GLK
drm/i915/psr: Fix register name mess up.
drm/armada: fix YUV planar format framebuffer offsets
drm/armada: improve efficiency of armada_drm_plane_calc_addrs()
drm/armada: fix UV swap code
drm/armada: fix SRAM powerdown
drm/armada: fix leak of crtc structure
Change the previous employers email addresses to the current email
address.
Link: http://lkml.kernel.org/r/20171229121726.31589-1-jeffy.chen@rock-chips.com
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Acked-by: Martin Kepplinger <martink@posteo.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The previous fix in commit 384632e67e ("userfaultfd: non-cooperative:
fix fork use after free") corrected the refcounting in case of
UFFD_EVENT_FORK failure for the fork userfault paths.
That still didn't clear the vma->vm_userfaultfd_ctx of the vmas that
were set to point to the aborted new uffd ctx earlier in
dup_userfaultfd.
Link: http://lkml.kernel.org/r/20171223002505.593-2-aarcange@redhat.com
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Reviewed-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
In commit 83e3c48729 ("mm/sparsemem: Allocate mem_section at runtime
for CONFIG_SPARSEMEM_EXTREME=y") mem_section is allocated at runtime to
save memory.
It allocates the first dimension of array with sizeof(struct mem_section).
It costs extra memory, should be sizeof(struct mem_section *).
Fix it.
Link: http://lkml.kernel.org/r/1513932498-20350-1-git-send-email-bhe@redhat.com
Fixes: 83e3c48729 ("mm/sparsemem: Allocate mem_section at runtime for CONFIG_SPARSEMEM_EXTREME=y")
Signed-off-by: Baoquan He <bhe@redhat.com>
Tested-by: Dave Young <dyoung@redhat.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Atsushi Kumagai <ats-kumagai@wm.jp.nec.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
`struct file_system_type' and alloc_anon_inode() function are defined in
fs.h, include it directly.
Link: http://lkml.kernel.org/r/20171219104219.3017-1-sergey.senozhatsky@gmail.com
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
With the recent addition of hashed kernel pointers, places which need to
produce useful debug output have to specify %px, not %p. This patch
fixes all the VM debug to use %px. This is appropriate because it's
debug output that the user should never be able to trigger, and kernel
developers need to see the actual pointers.
Link: http://lkml.kernel.org/r/20171219133236.GE13680@bombadil.infradead.org
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: "Tobin C. Harding" <me@tobin.cc>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
As Tsukada explains, the time_is_before_jiffies(acct->needcheck) check
is very wrong, we need time_is_after_jiffies() to make sys_acct() work.
Ignoring the overflows, the code should "goto out" if needcheck >
jiffies, while currently it checks "needcheck < jiffies" and thus in the
likely case check_free_space() does nothing until jiffies overflow.
In particular this means that sys_acct() is simply broken, acct_on()
sets acct->needcheck = jiffies and expects that check_free_space()
should set acct->active = 1 after the free-space check, but this won't
happen if jiffies increments in between.
This was broken by commit 32dc730860 ("get rid of timer in
kern/acct.c") in 2011, then another (correct) commit 795a2f22a8
("acct() should honour the limits from the very beginning") made the
problem more visible.
Link: http://lkml.kernel.org/r/20171213133940.GA6554@redhat.com
Fixes: 32dc730860 ("get rid of timer in kern/acct.c")
Reported-by: TSUKADA Koutaro <tsukada@ascade.co.jp>
Suggested-by: TSUKADA Koutaro <tsukada@ascade.co.jp>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
With latest kernel I get below bug while testing kdump:
BUG: unable to handle kernel paging request at ffffea00034b1040
IP: zero_resv_unavail+0xbd/0x126
PGD 37b98067 P4D 37b98067 PUD 37b97067 PMD 0
Oops: 0002 [#1] SMP
Modules linked in:
CPU: 0 PID: 0 Comm: swapper Not tainted 4.15.0-rc1+ #316
Hardware name: LENOVO 20ARS1BJ02/20ARS1BJ02, BIOS GJET92WW (2.42 ) 03/03/2017
task: ffffffff81a0e4c0 task.stack: ffffffff81a00000
RIP: 0010:zero_resv_unavail+0xbd/0x126
RSP: 0000:ffffffff81a03d88 EFLAGS: 00010006
RAX: 0000000000000000 RBX: ffffea00034b1040 RCX: 0000000000000010
RDX: 0000000000000000 RSI: 0000000000000092 RDI: ffffea00034b1040
RBP: 00000000000d2c41 R08: 00000000000000c0 R09: 0000000000000a0d
R10: 0000000000000002 R11: 0000000000007f01 R12: ffffffff81a03d90
R13: ffffea0000000000 R14: 0000000000000063 R15: 0000000000000062
FS: 0000000000000000(0000) GS:ffffffff81c73000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffea00034b1040 CR3: 0000000037609000 CR4: 00000000000606b0
Call Trace:
? free_area_init_nodes+0x640/0x664
? zone_sizes_init+0x58/0x72
? setup_arch+0xb50/0xc6c
? start_kernel+0x64/0x43d
? secondary_startup_64+0xa5/0xb0
Code: c1 e8 0c 48 39 d8 76 27 48 89 de 48 c1 e3 06 48 c7 c7 7a 87 79 81 e8 b0 c0 3e ff 4c 01 eb b9 10 00 00 00 31 c0 48 89 df 49 ff c6 <f3> ab eb bc 6a 00 49 c7 c0 f0 93 d1 81 31 d2 83 ce ff 41 54 49
RIP: zero_resv_unavail+0xbd/0x126 RSP: ffffffff81a03d88
CR2: ffffea00034b1040
---[ end trace f5ba9e8f73c7ee26 ]---
This is introduced by commit a4a3ede213 ("mm: zero reserved and
unavailable struct pages").
The reason is some efi reserved boot ranges is not reported in E820 ram.
In my case it is a bgrt buffer:
efi: mem00: [Boot Data |RUN| | | | | | | |WB|WT|WC|UC] range=[0x00000000d2c41000-0x00000000d2c85fff] (0MB)
Use "add_efi_memmap" can workaround the problem with another fix:
http://lkml.kernel.org/r/20171130052327.GA3500@dhcp-128-65.nay.redhat.com
In zero_resv_unavail it would be better to check pfn_valid first before
zero the page struct. This fixes the problem and potential other
similar problems. Also as Pavel Tatashin suggested checks pfn_valid at
the beginning of the section.
The range is backed by real memory. The memory range is efi "Boot
Service Data", that means after ExitBootServices() these ranges can be
used as system ram. But some of them need to be reserved, for example
the bgrt image address in an acpi table, if the image memory is freed
then kexec reboot will fail because kexec inherit same acpi table to
initialize the driver.
Link: http://lkml.kernel.org/r/20171201095048.GA3084@dhcp-128-65.nay.redhat.com
Fixes: a4a3ede213 ("mm: zero reserved and unavailable struct pages")
Signed-off-by: Dave Young <dyoung@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Pavel Tatashin <pasha.tatashin@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The recent changes for PTI touch cpu_tlbstate from various tlb_flush
inlines. cpu_tlbstate is exported as GPL symbol, so this causes a
regression when building out of tree drivers for certain graphics cards.
Aside of that the export was wrong since it was introduced as it should
have been EXPORT_PER_CPU_SYMBOL_GPL().
Use the correct PER_CPU export and drop the _GPL to restore the previous
state which allows users to utilize the cards they payed for.
As always I'm really thrilled to make this kind of change to support the
#friends (or however the hot hashtag of today is spelled) from that closet
sauce graphics corp.
Fixes: 1e02ce4ccc ("x86: Store a per-cpu shadow copy of CR4")
Fixes: 6fd166aae7 ("x86/mm: Use/Fix PCID to optimize user/kernel switches")
Reported-by: Kees Cook <keescook@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: stable@vger.kernel.org
Thomas reported the following warning:
BUG: using smp_processor_id() in preemptible [00000000] code: ovsdb-server/4498
caller is native_flush_tlb_single+0x57/0xc0
native_flush_tlb_single+0x57/0xc0
__set_pte_vaddr+0x2d/0x40
set_pte_vaddr+0x2f/0x40
cea_set_pte+0x30/0x40
ds_update_cea.constprop.4+0x4d/0x70
reserve_ds_buffers+0x159/0x410
x86_reserve_hardware+0x150/0x160
x86_pmu_event_init+0x3e/0x1f0
perf_try_init_event+0x69/0x80
perf_event_alloc+0x652/0x740
SyS_perf_event_open+0x3f6/0xd60
do_syscall_64+0x5c/0x190
set_pte_vaddr is used to map the ds buffers into the cpu entry area, but
there are two problems with that:
1) The resulting flush is not supposed to be called in preemptible context
2) The cpu entry area is supposed to be per CPU, but the debug store
buffers are mapped for all CPUs so these mappings need to be flushed
globally.
Add the necessary preemption protection across the mapping code and flush
TLBs globally.
Fixes: c1961a4631 ("x86/events/intel/ds: Map debug buffers in cpu_entry_area")
Reported-by: Thomas Zeitlhofer <thomas.zeitlhofer+lkml@ze-it.at>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Thomas Zeitlhofer <thomas.zeitlhofer+lkml@ze-it.at>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20180104170712.GB3040@hirez.programming.kicks-ass.net
vaddr_end for KASLR is only documented in the KASLR code itself and is
adjusted depending on config options. So it's not surprising that a change
of the memory layout causes KASLR to have the wrong vaddr_end. This can map
arbitrary stuff into other areas causing hard to understand problems.
Remove the whole ifdef magic and define the start of the cpu_entry_area to
be the end of the KASLR vaddr range.
Add documentation to that effect.
Fixes: 92a0f81d89 ("x86/cpu_entry_area: Move it out of the fixmap")
Reported-by: Benjamin Gilbert <benjamin.gilbert@coreos.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Benjamin Gilbert <benjamin.gilbert@coreos.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: stable <stable@vger.kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Garnier <thgarnie@google.com>,
Cc: Alexander Kuleshov <kuleshovmail@gmail.com>
Link: https://lkml.kernel.org/r/alpine.DEB.2.20.1801041320360.1771@nanos
- couple of documentation build fixes
- serialize non-blocking modesets
- prevent DMC from messing up GMBUS transfers
- PSR regression fix
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Merge tag 'drm-intel-fixes-2018-01-04' of git://anongit.freedesktop.org/drm/drm-intel into drm-fixes
drm/i915 fixes for v4.15-rc7
- couple of documentation build fixes
- serialize non-blocking modesets
- prevent DMC from messing up GMBUS transfers
- PSR regression fix
* tag 'drm-intel-fixes-2018-01-04' of git://anongit.freedesktop.org/drm/drm-intel:
drm/i915: Apply Display WA #1183 on skl, kbl, and cfl
docs: fix, intel_guc_loader.c has been moved to intel_guc_fw.c
documentation/gpu/i915: fix docs build error after file rename
drm/i915: Put all non-blocking modesets onto an ordered wq
drm/i915: Disable DC states around GMBUS on GLK
drm/i915/psr: Fix register name mess up.
- backport of a DC change which fixes a greenish tint on some RV hw
- properly handle kzalloc fail in ttm
* 'drm-fixes-4.15' of git://people.freedesktop.org/~agd5f/linux:
drm/ttm: check the return value of kzalloc
drm/amd/display: call set csc_default if enable adjustment is false
