Import the chapter about high level design from the on-disk format wiki
page into the kernel documentation.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Create the basic structure of the "new" data structures & algorithms
book to be ported over from the on-disk format wiki, and then start by
pulling in the introductory information.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Convert the existing ext4 documentation into rst format and link it in
with the rest of the kernel documentation.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Move Documentation/filesystems/ext4.txt into
Documentation/filesystems/ext4/ext4.rst in preparation for adding more
ext4 documentation.
Note that the documentation isn't in rst format yet, but as it's not
linked from anywhere it won't cause build errors.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Commit 8844618d8a: "ext4: only look at the bg_flags field if it is
valid" will complain if block group zero does not have the
EXT4_BG_INODE_ZEROED flag set. Unfortunately, this is not correct,
since a freshly created file system has this flag cleared. It gets
almost immediately after the file system is mounted read-write --- but
the following somewhat unlikely sequence will end up triggering a
false positive report of a corrupted file system:
mkfs.ext4 /dev/vdc
mount -o ro /dev/vdc /vdc
mount -o remount,rw /dev/vdc
Instead, when initializing the inode table for block group zero, test
to make sure that itable_unused count is not too large, since that is
the case that will result in some or all of the reserved inodes
getting cleared.
This fixes the failures reported by Eric Whiteney when running
generic/230 and generic/231 in the the nojournal test case.
Fixes: 8844618d8a ("ext4: only look at the bg_flags field if it is valid")
Reported-by: Eric Whitney <enwlinux@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
With commit 044e6e3d74: "ext4: don't update checksum of new
initialized bitmaps" the buffer valid bit will get set without
actually setting up the checksum for the allocation bitmap, since the
checksum will get calculated once we actually allocate an inode or
block.
If we are doing this, then we need to (re-)check the verified bit
after we take the block group lock. Otherwise, we could race with
another process reading and verifying the bitmap, which would then
complain about the checksum being invalid.
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1780137
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
The inline data code was updating the raw inode directly; this is
problematic since if metadata checksums are enabled,
ext4_mark_inode_dirty() must be called to update the inode's checksum.
In addition, the jbd2 layer requires that get_write_access() be called
before the metadata buffer is modified. Fix both of these problems.
https://bugzilla.kernel.org/show_bug.cgi?id=200443
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
Previously, when an MMP-protected file system is remounted read-only,
the kmmpd thread would exit the next time it woke up (a few seconds
later), without resetting the MMP sequence number back to
EXT4_MMP_SEQ_CLEAN.
Fix this by explicitly killing the MMP thread when the file system is
remounted read-only.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: Andreas Dilger <adilger@dilger.ca>
Ext4_check_descriptors() was getting called before s_gdb_count was
initialized. So for file systems w/o the meta_bg feature, allocation
bitmaps could overlap the block group descriptors and ext4 wouldn't
notice.
For file systems with the meta_bg feature enabled, there was a
fencepost error which would cause the ext4_check_descriptors() to
incorrectly believe that the block allocation bitmap overlaps with the
block group descriptor blocks, and it would reject the mount.
Fix both of these problems.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
A small collection of fixes, sort of the usual at this point, all for
i.MX or OMAP:
- Enable ULPI drivers on i.MX to avoid a hang
- Pinctrl fix for touchscreen on i.MX51 ZII RDU1
- Fixes for ethernet clock references on am3517
- mmc0 write protect detection fix for am335x
- kzalloc->kcalloc conversion in an OMAP driver
- USB metastability fix for USB on dra7
- Fix touchscreen wakeup on am437x
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Merge tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC fixes from Olof Johansson:
"A small collection of fixes, sort of the usual at this point, all for
i.MX or OMAP:
- Enable ULPI drivers on i.MX to avoid a hang
- Pinctrl fix for touchscreen on i.MX51 ZII RDU1
- Fixes for ethernet clock references on am3517
- mmc0 write protect detection fix for am335x
- kzalloc->kcalloc conversion in an OMAP driver
- USB metastability fix for USB on dra7
- Fix touchscreen wakeup on am437x"
* tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
ARM: imx_v4_v5_defconfig: Select ULPI support
ARM: imx_v6_v7_defconfig: Select ULPI support
ARM: dts: omap3: Fix am3517 mdio and emac clock references
ARM: dts: am335x-bone-common: Fix mmc0 Write Protect
bus: ti-sysc: Use 2-factor allocator arguments
ARM: dts: dra7: Disable metastability workaround for USB2
ARM: dts: imx51-zii-rdu1: fix touchscreen pinctrl
ARM: dts: am437x: make edt-ft5x06 a wakeup source
Pull x86/pti updates from Thomas Gleixner:
"Two small fixes correcting the handling of SSB mitigations on AMD
processors"
* 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/bugs: Fix the AMD SSBD usage of the SPEC_CTRL MSR
x86/bugs: Update when to check for the LS_CFG SSBD mitigation
Pull x86 fixes from Thomas Gleixner:
- Prevent an out-of-bounds access in mtrr_write()
- Break a circular dependency in the new hyperv IPI acceleration code
- Address the build breakage related to inline functions by enforcing
gnu_inline and explicitly bringing native_save_fl() out of line,
which also adds a set of _ARM_ARG macros which provide 32/64bit
safety.
- Initialize the shadow CR4 per cpu variable before using it.
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/mtrr: Don't copy out-of-bounds data in mtrr_write
x86/hyper-v: Fix the circular dependency in IPI enlightenment
x86/paravirt: Make native_save_fl() extern inline
x86/asm: Add _ASM_ARG* constants for argument registers to <asm/asm.h>
compiler-gcc.h: Add __attribute__((gnu_inline)) to all inline declarations
x86/mm/32: Initialize the CR4 shadow before __flush_tlb_all()
Pull scheduler fixes from Thomas Gleixner:
- The hopefully final fix for the reported race problems in
kthread_parkme(). The previous attempt still left a hole and was
partially wrong.
- Plug a race in the remote tick mechanism which triggers a warning
about updates not being done correctly. That's a false positive if
the race condition is hit as the remote CPU is idle. Plug it by
checking the condition again when holding run queue lock.
- Fix a bug in the utilization estimation of a run queue which causes
the estimation to be 0 when a run queue is throttled.
- Advance the global expiration of the period timer when the timer is
restarted after a idle period. Otherwise the expiry time is stale and
the timer fires prematurely.
- Cure the drift between the bandwidth timer and the runqueue
accounting, which leads to bogus throttling of runqueues
- Place the call to cpufreq_update_util() correctly so the function
will observe the correct number of running RT tasks and not a stale
one.
* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
kthread, sched/core: Fix kthread_parkme() (again...)
sched/util_est: Fix util_est_dequeue() for throttled cfs_rq
sched/fair: Advance global expiration when period timer is restarted
sched/fair: Fix bandwidth timer clock drift condition
sched/rt: Fix call to cpufreq_update_util()
sched/nohz: Skip remote tick on idle task entirely
Pull objtool fix from Thomas Gleixner:
"A single fix for objtool to address a bug in handling the cold
subfunction detection for aliased functions which was added recently.
The bug causes objtool to enter an infinite loop"
* 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
objtool: Support GCC 8 '-fnoreorder-functions'
Pull crypto fixes from Herbert Xu:
- add missing RETs in x86 aegis/morus
- fix build error in arm speck
* 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
crypto: x86 - Add missing RETs
crypto: arm/speck - fix building in Thumb2 mode
maliciously crafted file system image can result in a kernel OOPS or
hang. At least one fix addresses an inline data bug could be
triggered by userspace without the need of a crafted file system
(although it does require that the inline data feature be enabled).
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Merge tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
Pull ext4 bugfixes from Ted Ts'o:
"Bug fixes for ext4; most of which relate to vulnerabilities where a
maliciously crafted file system image can result in a kernel OOPS or
hang.
At least one fix addresses an inline data bug could be triggered by
userspace without the need of a crafted file system (although it does
require that the inline data feature be enabled)"
* tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
ext4: check superblock mapped prior to committing
ext4: add more mount time checks of the superblock
ext4: add more inode number paranoia checks
ext4: avoid running out of journal credits when appending to an inline file
jbd2: don't mark block as modified if the handle is out of credits
ext4: never move the system.data xattr out of the inode body
ext4: clear i_data in ext4_inode_info when removing inline data
ext4: include the illegal physical block in the bad map ext4_error msg
ext4: verify the depth of extent tree in ext4_find_extent()
ext4: only look at the bg_flags field if it is valid
ext4: make sure bitmaps and the inode table don't overlap with bg descriptors
ext4: always check block group bounds in ext4_init_block_bitmap()
ext4: always verify the magic number in xattr blocks
ext4: add corruption check in ext4_xattr_set_entry()
ext4: add warn_on_error mount option
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Merge tag 'pci-v4.18-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
Pull PCI fixes from Bjorn Helgaas:
- Fix a use-after-free in the endpoint code (Dan Carpenter)
- Stop defaulting CONFIG_PCIE_DW_PLAT_HOST to yes (Geert Uytterhoeven)
- Fix an nfp regression caused by a change in how we limit the number
of VFs we can enable (Jakub Kicinski)
- Fix failure path cleanup issues in the new R-Car gen3 PHY support
(Marek Vasut)
- Fix leaks of OF nodes in faraday, xilinx-nwl, xilinx (Nicholas Mc
Guire)
* tag 'pci-v4.18-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
nfp: stop limiting VFs to 0
PCI/IOV: Reset total_VFs limit after detaching PF driver
PCI: faraday: Add missing of_node_put()
PCI: xilinx-nwl: Add missing of_node_put()
PCI: xilinx: Add missing of_node_put()
PCI: endpoint: Use after free in pci_epf_unregister_driver()
PCI: controller: dwc: Do not let PCIE_DW_PLAT_HOST default to yes
PCI: rcar: Clean up PHY init on failure
PCI: rcar: Shut the PHY down in failpath
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Merge tag '4.18-rc3-smb3fixes' of git://git.samba.org/sfrench/cifs-2.6
Pull cifs fixes from Steve French:
"Five smb3/cifs fixes for stable (including for some leaks and memory
overwrites) and also a few fixes for recent regressions in packet
signing.
Additional testing at the recent SMB3 test event, and some good work
by Paulo and others spotted the issues fixed here. In addition to my
xfstest runs on these, Aurelien and Stefano did additional test runs
to verify this set"
* tag '4.18-rc3-smb3fixes' of git://git.samba.org/sfrench/cifs-2.6:
cifs: Fix stack out-of-bounds in smb{2,3}_create_lease_buf()
cifs: Fix infinite loop when using hard mount option
cifs: Fix slab-out-of-bounds in send_set_info() on SMB2 ACE setting
cifs: Fix memory leak in smb2_set_ea()
cifs: fix SMB1 breakage
cifs: Fix validation of signed data in smb2
cifs: Fix validation of signed data in smb3+
cifs: Fix use after free of a mid_q_entry
- Driver fixes for k3dma (off by one), pl330 (burst residue granularity)
and omap-dma (incorrect residue_granularity)
- Sinan's email update
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Merge tag 'dmaengine-fix-4.18-rc4' of git://git.infradead.org/users/vkoul/slave-dma
Pull dmaengine fixes from Vinod Koul:
"We have few odd driver fixes and one email update change for you this
time:
- Driver fixes for k3dma (off by one), pl330 (burst residue
granularity) and omap-dma (incorrect residue_granularity)
- Sinan's email update"
* tag 'dmaengine-fix-4.18-rc4' of git://git.infradead.org/users/vkoul/slave-dma:
dmaengine: k3dma: Off by one in k3_of_dma_simple_xlate()
dmaengine: pl330: report BURST residue granularity
MAINTAINERS: Update email-id of Sinan Kaya
dmaengine: ti: omap-dma: Fix OMAP1510 incorrect residue_granularity
an interrupt issue, and one oops fix if init fails in a certain
way on the client driver.
-corey
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Merge tag 'for-linus-4.18-2' of git://github.com/cminyard/linux-ipmi
Pull IPMI fixes from Corey Minyard:
"A couple of small fixes: one to the BMC side of things that fixes an
interrupt issue, and one oops fix if init fails in a certain way on
the client driver"
* tag 'for-linus-4.18-2' of git://github.com/cminyard/linux-ipmi:
ipmi: kcs_bmc: fix IRQ exception if the channel is not open
ipmi: Cleanup oops on initialization failure
Don't access the provided buffer out of bounds - this can cause a kernel
out-of-bounds read when invoked through sys_splice() or other things that
use kernel_write()/__kernel_write().
Fixes: 7f8ec5a4f0 ("x86/mtrr: Convert to use strncpy_from_user() helper")
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20180706215003.156702-1-jannh@google.com
This is two minor bug fixes (aacraid, target) and a fix for a
potential exploit in the way sg handles teardown.
Signed-off-by: James E.J. Bottomley <jejb@linux.vnet.ibm.com>
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Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Pull SCSI fixes from James Bottomley:
"This is two minor bug fixes (aacraid, target) and a fix for a
potential exploit in the way sg handles teardown"
* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
scsi: sg: mitigate read/write abuse
scsi: aacraid: Fix PD performance regression over incorrect qd being set
scsi: target: Fix truncated PR-in ReadKeys response
- Build cleanup/fix for the sunxi makefile that tried to save size
but failed and prevented dead code elimination from working
- Two Davinci clk driver fixes for a typo causing build failures
in different configurations and an error check that checks
the wrong variable.
- Undo the DT ABI breaking imx6ul binding header shuffle that got
merged this cycle.
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Merge tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux
Pull clk fixes from Stephen Boyd:
"The usual collection of driver fixlets:
- build cleanup/fix for the sunxi makefile that tried to save size
but failed and prevented dead code elimination from working
- two Davinci clk driver fixes for a typo causing build failures in
different configurations and an error check that checks the wrong
variable.
- undo the DT ABI breaking imx6ul binding header shuffle that got
merged this cycle"
* tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux:
dt-bindings: clock: imx6ul: Do not change the clock definition order
clk: davinci: fix a typo (which leads to build failures)
clk: davinci: cfgchip: testing the wrong variable
clk: sunxi-ng: replace lib-y with obj-y
Pull s390 fixes from Martin Schwidefsky:
"A few more changes for v4.18:
- wire up the two new system calls io_pgetevents and rseq
- fix a register corruption in the expolines code for machines
without EXRL
- drastically reduce the memory utilization of the dasd driver
- fix reference counting for KVM page table pages"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
s390: wire up rseq system call
s390: wire up io_pgetevents system call
s390/mm: fix refcount usage for 4K pgste
s390/dasd: reduce the default queue depth and nr of hardware queues
s390: Correct register corruption in critical section cleanup
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Merge tag 'drm-fixes-2018-07-06' of git://anongit.freedesktop.org/drm/drm
Pull drm fixes from Dave Airlie:
"This is the drm fixes for rc4.
It's a bit larger than I'd like but the exynos cleanups are pretty
mechanical, and I'd rather have them in sooner rather than later so we
can avoid too much conflicts around them. The non-mechanincal exynos
changes are mostly fixes for new feature recently introduced.
Apart from the exynos updates, we have:
i915:
- GVT and GGTT mapping fixes
amdgpu:
- fix HDMI2.0 4K@60 Hz regression
- Hotplug fixes for dual-GPU laptops to make power management better
- misc vega12 bios fixes, a race fix and some typos.
sii8620 bridge:
- small fixes around mode setting
core:
- use kvzalloc to allocate blob property memory"
* tag 'drm-fixes-2018-07-06' of git://anongit.freedesktop.org/drm/drm: (34 commits)
drm/amd/display: add a check for display depth validity
drm/amd/display: adding ycbcr420 pixel encoding for hdmi
drm/udl: fix display corruption of the last line
drm/bridge/sii8620: Fix link mode selection
drm/bridge/sii8620: Fix display of packed pixel modes
drm/bridge/sii8620: Send AVI infoframe in all MHL versions
drm/amdgpu: fix user fence write race condition
drm/i915: Try GGTT mmapping whole object as partial
drm/amdgpu/pm: fix display count in non-DC path
drm/amdgpu: fix swapped emit_ib_size in vce3
drm: Use kvzalloc for allocating blob property memory
drm/i915/gvt: changed DDI mode emulation type
drm/i915/gvt: fix a bug of partially write ggtt enties
drm/exynos: Replace drm_dev_unref with drm_dev_put
drm/exynos: Replace drm_gem_object_unreference_unlocked with put function
drm/exynos: Replace drm_framebuffer_{un/reference} with put,get functions
drm/exynos: ipp: use correct enum type
drm/exynos: decon5433: Fix WINCONx reset value
drm/exynos: decon5433: Fix per-plane global alpha for XRGB modes
drm/exynos: fimc: Use real buffer width for configuring the hardware
...
in the noise. These are minor bug fixes and clean ups. Those include:
- Avoiding a string overflow
- Code that didn't match the comment (but should)
- A small code optimization (use of a conditional)
- Quieting printf warnings
- Nuking unused code
- Fixing function graph interrupt annotation
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Merge tag 'trace-v4.18-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull tracing fixes and cleanups from Steven Rostedt:
"While cleaning out my INBOX, I found a few patches that were lost in
the noise. These are minor bug fixes and clean ups. Those include:
- avoid a string overflow
- code that didn't match the comment (but should)
- a small code optimization (use of a conditional)
- quiet printf warnings
- nuke unused code
- fix function graph interrupt annotation"
* tag 'trace-v4.18-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
tracing: Fix missing return symbol in function_graph output
ftrace: Nuke clear_ftrace_function
tracing: Use __printf markup to silence compiler
tracing: Optimize trace_buffer_iter() logic
tracing: Make create_filter() code match the comments
tracing: Avoid string overflow
- Fix several problems to IPPv2 merged to mainline recentely.
. An align problem of width size that IPP driver incorrectly
calculated the real buffer size.
. Horizontal and vertical flip problem.
. Per-plane global alpha for XRGB modes.
. Incorrect variant of the YUV modes.
- Fix plane overlapping problem.
. The stange order of overlapping planes on XRGB modes
by setting global alpha value to maximum value.
Cleanup
- Rename a enum type, drm_ipp_size_id, to one specific to Exynos,
drm_exynos_ipp_limit_type.
- Replace {un/reference} with {put,get} functions.
. it replaces several reference/unreference functions with Linux
kernel nameing standard.
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Merge tag 'exynos-drm-fixes-for-v4.18-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/daeinki/drm-exynos into drm-fixes
Fixups
- Fix several problems to IPPv2 merged to mainline recentely.
. An align problem of width size that IPP driver incorrectly
calculated the real buffer size.
. Horizontal and vertical flip problem.
. Per-plane global alpha for XRGB modes.
. Incorrect variant of the YUV modes.
- Fix plane overlapping problem.
. The stange order of overlapping planes on XRGB modes
by setting global alpha value to maximum value.
Cleanup
- Rename a enum type, drm_ipp_size_id, to one specific to Exynos,
drm_exynos_ipp_limit_type.
- Replace {un/reference} with {put,get} functions.
. it replaces several reference/unreference functions with Linux
kernel nameing standard.
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1530512041-21392-1-git-send-email-inki.dae@samsung.com
- A few small fixes for the sii8620 bridge.
- Allocate blob property memory using kvzalloc instead of kmalloc.
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Merge tag 'drm-misc-fixes-2018-07-05' of git://anongit.freedesktop.org/drm/drm-misc into drm-fixes
Fixes for v4.18-rc4:
- A few small fixes for the sii8620 bridge.
- Allocate blob property memory using kvzalloc instead of kmalloc.
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/4267636e-bb7c-8f69-eeff-12e045b3e7e1@linux.intel.com
Few dts fixes for regressions for various SoCs and
devices for touchscreen wake, dra7 USB quirk, pinmux
for beaglebone mmc, and emac clock.
Also included is a change for ti-sysc to use kcalloc
that Kees wanted to get into v4.18 as that's the last
one he wanted to fix for improved defense against
allocation overflows.
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Merge tag 'omap-for-v4.18/fixes-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into fixes
Fixes for omap for v4.18-rc cycle
Few dts fixes for regressions for various SoCs and
devices for touchscreen wake, dra7 USB quirk, pinmux
for beaglebone mmc, and emac clock.
Also included is a change for ti-sysc to use kcalloc
that Kees wanted to get into v4.18 as that's the last
one he wanted to fix for improved defense against
allocation overflows.
* tag 'omap-for-v4.18/fixes-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
ARM: dts: omap3: Fix am3517 mdio and emac clock references
ARM: dts: am335x-bone-common: Fix mmc0 Write Protect
bus: ti-sysc: Use 2-factor allocator arguments
ARM: dts: dra7: Disable metastability workaround for USB2
ARM: dts: am437x: make edt-ft5x06 a wakeup source
Signed-off-by: Olof Johansson <olof@lixom.net>
sgid directories have special semantics, making newly created files in
the directory belong to the group of the directory, and newly created
subdirectories will also become sgid. This is historically used for
group-shared directories.
But group directories writable by non-group members should not imply
that such non-group members can magically join the group, so make sure
to clear the sgid bit on non-directories for non-members (but remember
that sgid without group execute means "mandatory locking", just to
confuse things even more).
Reported-by: Jann Horn <jannh@google.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit may cause a less than required dma mask to be used for
some allocations, which apparently leads to module load failures for
iwlwifi sometimes.
This reverts commit d657c5c73c.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Fabio Coatti <fabio.coatti@gmail.com>
Tested-by: Fabio Coatti <fabio.coatti@gmail.com>
For every request we send, whether it is SMB1 or SMB2+, we attempt to
reconnect tcon (cifs_reconnect_tcon or smb2_reconnect) before carrying
out the request.
So, while server->tcpStatus != CifsNeedReconnect, we wait for the
reconnection to succeed on wait_event_interruptible_timeout(). If it
returns, that means that either the condition was evaluated to true, or
timeout elapsed, or it was interrupted by a signal.
Since we're not handling the case where the process woke up due to a
received signal (-ERESTARTSYS), the next call to
wait_event_interruptible_timeout() will _always_ fail and we end up
looping forever inside either cifs_reconnect_tcon() or smb2_reconnect().
Here's an example of how to trigger that:
$ mount.cifs //foo/share /mnt/test -o
username=foo,password=foo,vers=1.0,hard
(break connection to server before executing bellow cmd)
$ stat -f /mnt/test & sleep 140
[1] 2511
$ ps -aux -q 2511
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 2511 0.0 0.0 12892 1008 pts/0 S 12:24 0:00 stat -f
/mnt/test
$ kill -9 2511
(wait for a while; process is stuck in the kernel)
$ ps -aux -q 2511
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 2511 83.2 0.0 12892 1008 pts/0 R 12:24 30:01 stat -f
/mnt/test
By using 'hard' mount point means that cifs.ko will keep retrying
indefinitely, however we must allow the process to be killed otherwise
it would hang the system.
Signed-off-by: Paulo Alcantara <palcantara@suse.de>
Cc: stable@vger.kernel.org
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This patch fixes a memory leak when doing a setxattr(2) in SMB2+.
Signed-off-by: Paulo Alcantara <palcantara@suse.de>
Cc: stable@vger.kernel.org
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
SMB1 mounting broke in commit 35e2cc1ba7
("cifs: Use correct packet length in SMB2_TRANSFORM header")
Fix it and also rename smb2_rqst_len to smb_rqst_len
to make it less unobvious that the function is also called from
CIFS/SMB1
Good job by Paulo reviewing and cleaning up Ronnie's original patch.
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Reviewed-by: Paulo Alcantara <palcantara@suse.de>
Signed-off-by: Steve French <stfrench@microsoft.com>
Fixes: c713c8770f ("cifs: push rfc1002 generation down the stack")
We failed to validate signed data returned by the server because
__cifs_calc_signature() now expects to sign the actual data in iov but
we were also passing down the rfc1002 length.
Fix smb3_calc_signature() to calculate signature of rfc1002 length prior
to passing only the actual data iov[1-N] to __cifs_calc_signature(). In
addition, there are a few cases where no rfc1002 length is passed so we
make sure there's one (iov_len == 4).
Signed-off-by: Paulo Alcantara <palcantara@suse.de>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Fixes: c713c8770f ("cifs: push rfc1002 generation down the stack")
We failed to validate signed data returned by the server because
__cifs_calc_signature() now expects to sign the actual data in iov but
we were also passing down the rfc1002 length.
Fix smb3_calc_signature() to calculate signature of rfc1002 length prior
to passing only the actual data iov[1-N] to __cifs_calc_signature(). In
addition, there are a few cases where no rfc1002 length is passed so we
make sure there's one (iov_len == 4).
Signed-off-by: Paulo Alcantara <palcantara@suse.de>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
With protocol version 2.0 mounts we have seen crashes with corrupt mid
entries. Either the server->pending_mid_q list becomes corrupt with a
cyclic reference in one element or a mid object fetched by the
demultiplexer thread becomes overwritten during use.
Code review identified a race between the demultiplexer thread and the
request issuing thread. The demultiplexer thread seems to be written
with the assumption that it is the sole user of the mid object until
it calls the mid callback which either wakes the issuer task or
deletes the mid.
This assumption is not true because the issuer task can be woken up
earlier by a signal. If the demultiplexer thread has proceeded as far
as setting the mid_state to MID_RESPONSE_RECEIVED then the issuer
thread will happily end up calling cifs_delete_mid while the
demultiplexer thread still is using the mid object.
Inserting a delay in the cifs demultiplexer thread widens the race
window and makes reproduction of the race very easy:
if (server->large_buf)
buf = server->bigbuf;
+ usleep_range(500, 4000);
server->lstrp = jiffies;
To resolve this I think the proper solution involves putting a
reference count on the mid object. This patch makes sure that the
demultiplexer thread holds a reference until it has finished
processing the transaction.
Cc: stable@vger.kernel.org
Signed-off-by: Lars Persson <larper@axis.com>
Acked-by: Paulo Alcantara <palcantara@suse.de>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
It turns out that systemd has a bug: it wants to load the autofs module
early because of some initialization ordering with udev, and it doesn't
do that correctly. Everywhere else it does the proper "look up module
name" that does the proper alias resolution, but in that early code, it
just uses a hardcoded "autofs4" for the module name.
The result of that is that as of commit a2225d931f ("autofs: remove
left-over autofs4 stubs"), you get
systemd[1]: Failed to insert module 'autofs4': No such file or directory
in the system logs, and a lack of module loading. All this despite the
fact that we had very clearly marked 'autofs4' as an alias for this
module.
What's so ridiculous about this is that literally everything else does
the module alias handling correctly, including really old versions of
systemd (that just used 'modprobe' to do this), and even all the other
systemd module loading code.
Only that special systemd early module load code is broken, hardcoding
the module names for not just 'autofs4', but also "ipv6", "unix",
"ip_tables" and "virtio_rng". Very annoying.
Instead of creating an _additional_ separate compatibility 'autofs4'
module, just rely on the fact that everybody else gets this right, and
just call the module 'autofs4' for compatibility reasons, with 'autofs'
as the alias name.
That will allow the systemd people to fix their bugs, adding the proper
alias handling, and maybe even fix the name of the module to be just
"autofs" (so that they can _test_ the alias handling). And eventually,
we can revert this silly compatibility hack.
See also
https://github.com/systemd/systemd/issues/9501https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=902946
for the systemd bug reports upstream and in the Debian bug tracker
respectively.
Fixes: a2225d931f ("autofs: remove left-over autofs4 stubs")
Reported-by: Ben Hutchings <ben@decadent.org.uk>
Reported-by: Michael Biebl <biebl@debian.org>
Cc: Ian Kent <raven@themaw.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Linking the ARM64 defconfig kernel with LLVM lld fails with the error:
ld.lld: error: unknown argument: -p
Makefile:1015: recipe for target 'vmlinux' failed
Without this flag, the ARM64 defconfig kernel successfully links with
lld and boots on Dragonboard 410c.
After digging through binutils source and changelogs, it turns out that
-p is only relevant to ancient binutils installations targeting 32-bit
ARM. binutils accepts -p for AArch64 too, but it's always been
undocumented and silently ignored. A comment in
ld/emultempl/aarch64elf.em explains that it's "Only here for backwards
compatibility".
Since this flag is a no-op on ARM64, we can safely drop it.
Acked-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Greg Hackmann <ghackmann@google.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
- Revert part of a recent ACPICA regression fix that added leading
newlines to ACPICA error messages and made the kernel log look
broken (Rafael Wysocki).
- Fix an ACPI battery driver regression introduced during the 4.17
cycle due to incorrect error handling that made Thinkpad 13
laptops crash on boot (Jouke Witteveen).
- Fix up the recently added PPTT ACPI table support by covering
the case when a PPTT structure represents a processors group
correctly (Sudeep Holla).
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Merge tag 'acpi-4.18-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull ACPI fixes from Rafael Wysocki:
"These fix a recent ACPICA regression, fix a battery driver regression
introduced during the 4.17 cycle and fix up the recently added support
for the PPTT ACPI table.
Specifics:
- Revert part of a recent ACPICA regression fix that added leading
newlines to ACPICA error messages and made the kernel log look
broken (Rafael Wysocki).
- Fix an ACPI battery driver regression introduced during the 4.17
cycle due to incorrect error handling that made Thinkpad 13 laptops
crash on boot (Jouke Witteveen).
- Fix up the recently added PPTT ACPI table support by covering the
case when a PPTT structure represents a processors group correctly
(Sudeep Holla)"
* tag 'acpi-4.18-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
ACPI / battery: Safe unregistering of hooks
ACPI / PPTT: use ACPI ID whenever ACPI_PPTT_ACPI_PROCESSOR_ID_VALID is set
ACPICA: Drop leading newlines from error messages
