Pull CIFS fix from Steve French:
"Fixes a regression in cifs in which a password which begins with a
comma is parsed incorrectly as a blank password"
* 'for-next' of git://git.samba.org/sfrench/cifs-2.6:
cifs: Allow passwords which begin with a delimitor
This contains a few small ASoC fixes (wm8903, wm5102, samsung-i2s,
tegra, and soc-compress) and an endian fix for NI USB-audio devices,
update for Mark's e-mail address.
No scary changes, AFAIS.
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Merge tag 'sound-3.9' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
Pull sound fixes from Takashi Iwai:
"This contains a few small ASoC fixes (wm8903, wm5102, samsung-i2s,
tegra, and soc-compress) and an endian fix for NI USB-audio devices,
update for Mark's e-mail address.
No scary changes, AFAIS."
* tag 'sound-3.9' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
MAINTAINERS: Update e-mail address
ASoC: wm5102: Correct lookup of arizona struct in SYSCLK event
ASoC: wm8903: Fix the bypass to HP/LINEOUT when no DAC or ADC is running
ALSA: usb-audio: fix endianness bug in snd_nativeinstruments_*
ASoC: tegra: Don't claim to support PCM pause and resume
ASoC: Samsung: set drvdata before adding secondary device
ASoC: Samsung: return error if drvdata is not set
ASoC: compress: Cancel delayed power down if needed
ASoC: core: Fix to check return value of snd_soc_update_bits_locked()
Update the e-mail address I use for subsystems.
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Merge tag 'asoc-maintainers-v3.9-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus
MAINTAINERS: Update e-mail address
Update the e-mail address I use for subsystems.
A few updates, more than I'd like, fixing some relatively small issues
but mostly driver specific ones. Nothing wildly exciting so if it
doesn't make v3.9 it won't be the end of the world but it'd be nice.
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Merge tag 'asoc-v3.9-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus
ASoC: Updates for v3.9
A few updates, more than I'd like, fixing some relatively small issues
but mostly driver specific ones. Nothing wildly exciting so if it
doesn't make v3.9 it won't be the end of the world but it'd be nice.
Pull slave-dmaengine fixes from Vinod Koul:
"The first one fixes issue in pl330 to check for DT compatible and
the second one fixes omap-dma to start without delay"
* 'fixes' of git://git.infradead.org/users/vkoul/slave-dma:
dmaengine: omap-dma: Start DMA without delay for cyclic channels
DMA: PL330: Add check if device tree compatible
- System reboot/halt fix related to CPU offline ordering
from Huacai Chen.
- intel_pstate driver fix for a delay time computation error
occasionally crashing systems using it from Dirk Brandewie.
/
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Merge tag 'pm-3.9-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull power management fixes from Rafael Wysocki:
- System reboot/halt fix related to CPU offline ordering from Huacai
Chen.
- intel_pstate driver fix for a delay time computation error
occasionally crashing systems using it from Dirk Brandewie.
* tag 'pm-3.9-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
PM / reboot: call syscore_shutdown() after disable_nonboot_cpus()
cpufreq / intel_pstate: Set timer timeout correctly
This reverts commit bc8ce4 (regmap: don't corrupt work buffer in
_regmap_raw_write()) since it turns out that it can cause issues when
taken in isolation from the other changes in -next that lead to its
discovery. On the basis that nobody noticed the problems for quite some
time without that subsequent work let's drop it from v3.9.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Merge tag 'regmap-v3.9-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap
Pull regmap revert from Mark Brown:
"regmap: Back out work buffer fix
This reverts commit bc8ce4 (regmap: don't corrupt work buffer in
_regmap_raw_write()) since it turns out that it can cause issues when
taken in isolation from the other changes in -next that lead to its
discovery. On the basis that nobody noticed the problems for quite
some time without that subsequent work let's drop it from v3.9."
* tag 'regmap-v3.9-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
regmap: Back out work buffer fix
Some important bug fixes that came in over the last 10 days,
mostly mvebu and imx:
- Multiple regressions on i.mx following the conversion of
the clock code, hopefully the last we are seeing of those.
- a regression in the mvebu irq handling code
- An incorrect register offset in the rewritten s3c24xx irq code.
- Two bugs in setting up the iomega_ix2_200 machine
- Turning on an extra bus clock on imx
- A MAINTAINERS file entry for Roland Stigge
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Merge tag 'arm-soc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC bug fixes from Arnd Bergmann:
"A little later during the week than the last few pull requests, since
there was very little that came in before 3.9-rc6. At least things
have calmed down again here.
Some important bug fixes that came in over the last 10 days, mostly
mvebu and imx:
- Multiple regressions on i.mx following the conversion of the clock
code, hopefully the last we are seeing of those.
- a regression in the mvebu irq handling code
- An incorrect register offset in the rewritten s3c24xx irq code.
- Two bugs in setting up the iomega_ix2_200 machine
- Turning on an extra bus clock on imx
- A MAINTAINERS file entry for Roland Stigge"
* tag 'arm-soc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
arm: mvebu: Fix the irq map function in SMP mode
Fix GE0/GE1 init on ix2-200 as GE0 has no PHY
ARM: S3C24XX: Fix interrupt pending register offset of the EINT controller
ARM: S3C24XX: Correct NR_IRQS definition for s3c2440
ARM i.MX6: Fix ldb_di clock selection
ARM: imx: provide twd clock lookup from device tree
ARM: imx35 Bugfix admux clock
ARM: clk-imx35: Bugfix iomux clock
ARM: mxs: Slow down the I2C clock speed
MAINTAINERS: Add maintainer for LPC32xx
ARM: Kirkwood: Fix typo in the definition of ix2-200 rebuild LED
We actually have to pass chip as the host_data parameter of
irq_domain_add_simple() as later on, it is used to initialize chip_data
in pca953x_gpio_irq_map(). Failing to do so is leading to a NULL pointer
dereference after calling irq_data_get_irq_chip_data() in
pca953x_irq_mask(), pca953x_irq_unmask(), pca953x_irq_bus_lock(),
pca953x_irq_bus_sync_unlock() and pca953x_irq_set_type().
Fixes regression introduced by commit
0e8f2fdacf (gpio: pca953x: use simple
irqdomain)
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
- Kirkwood
- a couple of small fixes for the Iomega ix2-200 board (ether and led)
- mvebu
- allow GPIO button to work on Mirabox when running SMP
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Merge tag 'mvebu_fixes_for_v3.9_round3' of git://git.infradead.org/users/jcooper/linux into fixes
From Jason Cooper <jason@lakedaemon.net>:
mvebu fixes for v3.9 round 3
- Kirkwood
- a couple of small fixes for the Iomega ix2-200 board (ether and led)
- mvebu
- allow GPIO button to work on Mirabox when running SMP
* tag 'mvebu_fixes_for_v3.9_round3' of git://git.infradead.org/users/jcooper/linux:
arm: mvebu: Fix the irq map function in SMP mode
Fix GE0/GE1 init on ix2-200 as GE0 has no PHY
ARM: Kirkwood: Fix typo in the definition of ix2-200 rebuild LED
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Here is a single Kconfig dependancy build fix for 3.9.
It's been in linux-next for a while, and fixes a problem that has been
reported multiple times.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'char-misc-3.9-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull char/misc fix from Greg Kroah-Hartman:
"Here is a single Kconfig dependancy build fix for 3.9.
It's been in linux-next for a while, and fixes a problem that has been
reported multiple times."
* tag 'char-misc-3.9-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
misc/vmw_vmci: Add dependency on CONFIG_NET
Here are 4 small tty/serial fixes for 3.9.
One fixes a bug where we broke the documentation build, and the others
fix reported problems in some serial drivers.
All have been in linux-next for a while.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'tty-3.9-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Pull tty/serial fixes from Greg Kroah-Hartman:
"Here are 4 small tty/serial fixes for 3.9.
One fixes a bug where we broke the documentation build, and the others
fix reported problems in some serial drivers.
All have been in linux-next for a while"
* tag 'tty-3.9-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
tty: mxser: fix cycle termination condition in mxser_probe() and mxser_module_init()
Revert "tty/8250_pnp: serial port detection regression since v3.7"
OMAP/serial: Revert bad fix of Rx FIFO threshold granularity
tty: Documentation: fix a path in a DocBook template
- Early bootup issue found on DL380 machines
- Fix for the timer interrupt not being processed right away.
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Merge tag 'stable/for-linus-3.9-rc6-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen
Pull Xen fixes from Konrad Rzeszutek Wilk:
"Two bug-fixes:
- Early bootup issue found on DL380 machines
- Fix for the timer interrupt not being processed right awaym leading
to quite delayed time skew on certain workloads"
* tag 'stable/for-linus-3.9-rc6-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
xen/mmu: On early bootup, flush the TLB when changing RO->RW bits Xen provided pagetables.
xen/events: Handle VIRQ_TIMER before any other hardirq in event loop.
If the function profiler fails to allocate memory for everything,
it will do a double free on the same pointer which can cause a panic.
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Merge tag 'trace-fixes-3.9-rc-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull tracing fix from Steven Rostedt:
"Namhyung Kim fixed a long standing bug that can cause a kernel panic.
If the function profiler fails to allocate memory for everything, it
will do a double free on the same pointer which can cause a panic"
* tag 'trace-fixes-3.9-rc-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
tracing: Fix double free when function profile init failed
Pull networking fixes from David Miller:
1) cfg80211_conn_scan() must be called with the sched_scan_mutex, fix
from Artem Savkov.
2) Fix regression in TCP ICMPv6 processing, we do not want to treat
redirects as socket errors, from Christoph Paasch.
3) Fix several recvmsg() msg_name kernel memory leaks into userspace,
in ATM, AX25, Bluetooth, CAIF, IRDA, s390 IUCV, L2TP, LLC, Netrom,
NFC, Rose, TIPC, and VSOCK. From Mathias Krause and Wei Yongjun.
4) Fix AF_IUCV handling of segmented SKBs in recvmsg(), from Ursula
Braun and Eric Dumazet.
5) CAN gw.c code does kfree() on SLAB cache memory, use
kmem_cache_free() instead. Fix from Wei Yongjun.
6) Fix LSM regression on TCP SYN/ACKs, some LSMs such as SELINUX want
an skb->sk socket context available for these packets, but nothing
else requires it. From Eric Dumazet and Paul Moore.
7) Fix ipv4 address lifetime processing so that we don't perform
sleepable acts inside of rcu_read_lock() sections, do them in an
rtnl_lock() section instead. From Jiri Pirko.
8) mvneta driver accidently sets HW features after device registry, it
should do so beforehand. Fix from Willy Tarreau.
9) Fix bonding unload races more correctly, from Nikolay Aleksandrov
and Veaceslav Falico.
10) rtnl_dump_ifinfo() and rtnl_calcit() invoke nlmsg_parse() with wrong
header size argument. Fix from Michael Riesch.
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (44 commits)
lsm: add the missing documentation for the security_skb_owned_by() hook
bnx2x: Prevent null pointer dereference in AFEX mode
e100: Add dma mapping error check
selinux: add a skb_owned_by() hook
can: gw: use kmem_cache_free() instead of kfree()
netrom: fix invalid use of sizeof in nr_recvmsg()
qeth: fix qeth_wait_for_threads() deadlock for OSN devices
af_iucv: fix recvmsg by replacing skb_pull() function
rtnetlink: Call nlmsg_parse() with correct header length
bonding: fix bonding_masters race condition in bond unloading
Revert "bonding: remove sysfs before removing devices"
net: mvneta: enable features before registering the driver
hyperv: Fix RNDIS send_completion code path
hyperv: Fix a kernel warning from netvsc_linkstatus_callback()
net: ipv4: fix schedule while atomic bug in check_lifetime()
net: ipv4: reset check_lifetime_work after changing lifetime
bnx2x: Fix KR2 rapid link flap
sctp: remove 'sridhar' from maintainers list
VSOCK: Fix missing msg_namelen update in vsock_stream_recvmsg()
VSOCK: vmci - fix possible info leak in vmci_transport_dgram_dequeue()
...
Fixes a regression in cifs_parse_mount_options where a password
which begins with a delimitor is parsed incorrectly as being a blank
password.
Signed-off-by: Sachin Prabhu <sprabhu@redhat.com>
Acked-by: Jeff Layton <jlayton@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Steve French <sfrench@us.ibm.com>
Unfortunately we didn't catch the missing comments earlier when the
patch was merged.
Signed-off-by: Paul Moore <pmoore@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
The cnic module is responsible for initializing various bnx2x structs
via callbacks provided by the bnx2x module.
One such struct is the queue object for the FCoE queue.
If a device is working in AFEX mode and its configuration allows FCoE yet
the cnic module is not loaded, it's very likely a null pointer dereference
will occur, as the bnx2x will erroneously access the FCoE's queue object.
Prevent said access until cnic properly registers itself.
Signed-off-by: Yuval Mintz <yuvalmin@broadcom.com>
Signed-off-by: Ariel Elior <ariele@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
- Fix a brain fart in nfs41_walk_client_list
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Merge tag 'nfs-for-3.9-5' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
Pull another nfs fixlet from Trond Myklebust:
"I suddenly noticed that a one-line issue that I _thought_ I had fixed
with the nfs41_walk_client_list patch was apparently still there in
the pull request I sent earlier today. I'm very sorry for not
catching that in time.
- Fix a brain fart in nfs41_walk_client_list"
* tag 'nfs-for-3.9-5' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
NFSv4: Doh! Typo in the fix to nfs41_walk_client_list
This patch fix the regression introduced by the commit 3202bf0157
"arm: mvebu: Improve the SMP support of the interrupt controller":
GPIO IRQ were no longer delivered to the CPUs.
To be delivered to a CPU an interrupt must be enabled at CPU level and
at interrupt source level. Before the offending patch, all the
interrupts were enabled at source level during map() function. Mask()
and unmask() was done by handling the per-CPU part. It was fine when
running in UP with only one CPU.
The offending patch added support for SMP, in this case mask() and
unmask() was done by handling the interrupt source level part. The
per-CPU level part was handled by the affinity API to select the CPU
which will receive the interrupt. (Due to some hardware limitation
only one CPU at a time can received a given interrupt).
For "normal" interrupt __setup_irq() was called when an irq was
registered. irq_set_affinity() is called from this function, which
enabled the interrupt on one of the CPUs. Whereas for GPIO IRQ which
were chained interrupts, the irq_set_affinity() was never called and
none of the CPUs was selected to receive the interrupt.
With this patch all the interrupt are enable on the current CPU during
map() function. Enabling the interrupts on a CPU doesn't depend
anymore on irq_set_affinity() and then the chained irq are not anymore
a special case. However the CPU which will receive the irq can still
be modify later using irq_set_affinity().
Tested with Mirabox (A370) and Openblocks AX3 (AXP), rootfs mounted
over NFS, compiled with CONFIG_SMP=y/N.
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Reported-by: Ryan Press <ryan@presslab.us>
Investigated-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Tested-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Tested-by: Ryan Press <ryan@presslab.us>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Make sure that we set the status to 0 on success. Missed in testing
because it never appears when doing multiple mounts to _different_
servers.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: <stable@vger.kernel.org> # 3.7.x: 7b1f1fd: NFSv4/4.1: Fix bugs in nfs4[01]_walk_client_list
- Stable fix for memory corruption issues in nfs4[01]_walk_client_list
- Stable fix for an Oopsable bug in rpc_clone_client
- Another state manager deadlock in the NFSv4 open code
- Memory leaks in nfs4_discover_server_trunking and rpc_new_client
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Merge tag 'nfs-for-3.9-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
Pull NFS client bugfixes from Trond Myklebust:
- fix for memory corruption issues in nfs4[01]_walk_client_list (stable)
- fix for an Oopsable bug in rpc_clone_client (stable)
- another state manager deadlock in the NFSv4 open code
- memory leaks in nfs4_discover_server_trunking and rpc_new_client
* tag 'nfs-for-3.9-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
NFSv4: Fix another potential state manager deadlock
SUNRPC: Fix a potential memory leak in rpc_new_client
NFSv4/4.1: Fix bugs in nfs4[01]_walk_client_list
NFSv4: Fix a memory leak in nfs4_discover_server_trunking
SUNRPC: Remove extra xprt_put()
cyclic DMA is only used by audio which needs DMA to be started without a
delay.
If the DMA for audio is started using the tasklet we experience random
channel switch (to be more precise: channel shift).
Reported-by: Peter Meerwald <pmeerw@pmeerw.net>
CC: stable@vger.kernel.org # v3.7+
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Pull crypto fixes from Herbert Xu:
"This fixes a GCM bug that breaks IPsec and a compile problem in
ux500."
* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
crypto: ux500 - add missing comma
crypto: gcm - fix assumption that assoc has one segment
Pull drm fixes from Dave Airlie:
"Just a spare semicolon in nouveau that caused some issues, and an
mgag200 fix"
* 'drm-fixes' of git://people.freedesktop.org/~airlied/linux:
drm/mgag200: Index 24 in extended CRTC registers is 24 in hex, not decimal.
drm/nouveau: fix unconditional return waiting on memory
This change properly enables the "requester" in G200ER cards that is
responsible for getting pixels out of memory and clocking them out to
the screen.
Signed-off-by: Christopher Harvey <charvey@matrox.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
On the failure path, stat->start and stat->pages will refer same page.
So it'll attempt to free the same page again and get kernel panic.
Link: http://lkml.kernel.org/r/1364820385-32027-1-git-send-email-namhyung@kernel.org
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: stable@vger.kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
arch_local_irq_save() and friends are required to act as compiler
memory barriers. This patch adds a "memory" clobber to the inline
asm code in arch_local_irq_restore() which is used as the building
block for other functions needing to set/clear the interrupt enable
in the CSR register.
Signed-off-by: Mark Salter <msalter@redhat.com>
Pull vfs fixes from Al Viro:
"A nasty bug in fs/namespace.c caught by Andrey + a couple of less
serious unpleasantness - ecryptfs misc device playing hopeless games
with try_module_get() and palinfo procfs support being... not quite
correctly done, to be polite."
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
mnt: release locks on error path in do_loopback
palinfo fixes
procfs: add proc_remove_subtree()
ecryptfs: close rmmod race
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Merge tag 'for-linus-20130409' of git://git.kernel.dk/linux-block
Pull block fixes from Jens Axboe:
"I've got a few smaller fixes queued up for 3.9 that should go in. The
major one is the loop regression, the others are nice fixes on their
own though. It contains:
- Fix for unitialized var in the block sysfs code, courtesy of Arnd
and gcc-4.8.
- Two fixes for mtip32xx, fixing probe and command timeout. Also a
debug measure that could have waited for 3.10, but it's driver
only, so I let it slip in.
- Revert the loop partition cleanup fix, it could cause a deadlock on
auto-teardown as part of umount. The fix is clear, but at this
point we just want to revert it and get a real fix in for 3.10."
* tag 'for-linus-20130409' of git://git.kernel.dk/linux-block:
Revert "loop: cleanup partitions when detaching loop device"
mtip32xx: fix two smatch warnings
mtip32xx: Add debugfs entry device_status
mtip32xx: return 0 from pci probe in case of rebuild
mtip32xx: recovery from command timeout
block: avoid using uninitialized value in from queue_var_store
do_loopback calls lock_mount(path) and forget to unlock_mount
if clone_mnt or copy_mnt fails.
[ 77.661566] ================================================
[ 77.662939] [ BUG: lock held when returning to user space! ]
[ 77.664104] 3.9.0-rc5+ #17 Not tainted
[ 77.664982] ------------------------------------------------
[ 77.666488] mount/514 is leaving the kernel with locks still held!
[ 77.668027] 2 locks held by mount/514:
[ 77.668817] #0: (&sb->s_type->i_mutex_key#7){+.+.+.}, at: [<ffffffff811cca22>] lock_mount+0x32/0xe0
[ 77.671755] #1: (&namespace_sem){+++++.}, at: [<ffffffff811cca3a>] lock_mount+0x4a/0xe0
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* check for proc_mkdir() failures
* fix buffer overrun - sizeof(format string) is *not* enough to
hold sprintf() result.
* use proc_remove_subtree(); life's much easier with it
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
just what it sounds like; do that only to procfs subtrees you've
created - doing that to something shared with another driver is
not only antisocial, but might cause interesting races with
proc_create() and its ilk.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
In UP and non-preempt respectively, the spinlocks and preemption
disable/enable points are stubbed out entirely, because there is no
regular code that can ever hit the kind of concurrency they are meant to
protect against.
However, while there is no regular code that can cause scheduling, we
_do_ end up having some exceptional (literally!) code that can do so,
and that we need to make sure does not ever get moved into the critical
region by the compiler.
In particular, get_user() and put_user() is generally implemented as
inline asm statements (even if the inline asm may then make a call
instruction to call out-of-line), and can obviously cause a page fault
and IO as a result. If that inline asm has been scheduled into the
middle of a preemption-safe (or spinlock-protected) code region, we
obviously lose.
Now, admittedly this is *very* unlikely to actually ever happen, and
we've not seen examples of actual bugs related to this. But partly
exactly because it's so hard to trigger and the resulting bug is so
subtle, we should be extra careful to get this right.
So make sure that even when preemption is disabled, and we don't have to
generate any actual *code* to explicitly tell the system that we are in
a preemption-disabled region, we need to at least tell the compiler not
to move things around the critical region.
This patch grew out of the same discussion that caused commits
79e5f05edc ("ARC: Add implicit compiler barrier to raw_local_irq*
functions") and 3e2e0d2c22 ("tile: comment assumption about
__insn_mtspr for <asm/irqflags.h>") to come about.
Note for stable: use discretion when/if applying this. As mentioned,
this bug may never have actually bitten anybody, and gcc may never have
done the required code motion for it to possibly ever trigger in
practice.
Cc: stable@vger.kernel.org
Cc: Steven Rostedt <srostedt@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Marc Kleine-Budde says:
====================
here's a fix for the v3.9 release cycle, if not too late:
Wei Yongjun contributes a patch for the can-gw protocoll. The patch fixes the
memory allocated with kmem_cache_alloc(), is now freed using kmem_cache_free(),
not kfree().
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Commit 90ba9b1986 (tcp: tcp_make_synack() can use alloc_skb())
broke certain SELinux/NetLabel configurations by no longer correctly
assigning the sock to the outgoing SYNACK packet.
Cost of atomic operations on the LISTEN socket is quite big,
and we would like it to happen only if really needed.
This patch introduces a new security_ops->skb_owned_by() method,
that is a void operation unless selinux is active.
Reported-by: Miroslav Vadkerti <mvadkert@redhat.com>
Diagnosed-by: Paul Moore <pmoore@redhat.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: linux-security-module@vger.kernel.org
Acked-by: James Morris <james.l.morris@oracle.com>
Tested-by: Paul Moore <pmoore@redhat.com>
Acked-by: Paul Moore <pmoore@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Don't hold the NFSv4 sequence id while we check for open permission.
The call to ACCESS may block due to reboot recovery.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
The arch_local_irq_save(), etc., routines are required to function
as compiler barriers. They do, but it's subtle and requires knowing
that the gcc builtin __insn_mtspr() is marked as a memory clobber.
Provide a comment explaining the assumption.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
[ This came about from me wondering about the synchronization rules of
__insn_mtspr() - Linus ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
