Implement compatibility with new hw_features for dev_disable_lro().
This is a transition path - dev_disable_lro() should be later
integrated into netdev_fix_features() after all drivers are converted.
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Simon Horman <horms@verge.net.au>
Cc: Julian Anastasov <ja@ssi.bg>
Acked-by: Simon Horman <horms@verge.net.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Commit 44540960 "veth: move loopback logic to common location" introduced
a bug in the packet counters. I don't understand why that happened as it
is not explained in the comments and the mut check in dev_forward_skb
retains the assumption that skb->len is the total length of the packet.
I just measured this emperically by setting up a veth pair between two
noop network namespaces setting and attempting a telnet connection between
the two. I saw three packets in each direction and the byte counters were
exactly 14*3 = 42 bytes high in each direction. I got the actual
packet lengths with tcpdump.
So remove the extra ETH_HLEN from the veth byte count totals.
Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
When I was fixing issues with unregisgtering tables under /proc/sys/net/ipv6/neigh
by adding a mount point it appears I missed a critical ordering issue, in the
ipv6 initialization. I had not realized that ipv6_sysctl_register is called
at the very end of the ipv6 initialization and in particular after we call
neigh_sysctl_register from ndisc_init.
"neigh" needs to be initialized in ipv6_static_sysctl_register which is
the first ipv6 table to initialized, and definitely before ndisc_init.
This removes the weirdness of duplicate tables while still providing a
"neigh" mount point which prevents races in sysctl unregistering.
This was initially reported at https://bugzilla.kernel.org/show_bug.cgi?id=31232
Reported-by: sunkan@zappa.cx
Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
When the macvlan driver was extended to call unregisgter_netdevice_queue
in 23289a37e2, a use after free of struct
macvlan_port was introduced. The code in dellink relied on unregister_netdevice
actually unregistering the net device so it would be safe to free macvlan_port.
Since unregister_netdevice_queue can just queue up the unregister instead of
performing the unregiser immediately we free the macvlan_port too soon and
then the code in macvlan_stop removes the macaddress for the set of macaddress
to listen for and uses memory that has already been freed.
To fix this add a reference count to track when it is safe to free the macvlan_port
and move the call of macvlan_port_destroy into macvlan_uninit which is guaranteed
to be called after the final macvlan_port_close.
Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
It was pointed out to me recently that my spelling could be better :)
Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
I ran into some trouble while testing the SocketCAN driver for the BOSCH
C_CAN controller. The interface is not correctly initialized, if I put
some CAN traffic on the line, _while_ the interface is being started
(which means: the interface doesn't come up correcty, if there's some RX
traffic while doing 'ifconfig can0 up').
The current implementation enables the controller interrupts _before_
doing the basic c_can configuration. I think, this should be done the
other way round.
The patch below fixes things for me.
Signed-off-by: Jan Altenberg <jan@linutronix.de>
Acked-by: Kurt Van Dijck <kurt.van.dijck@eia.be>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
The BKL removal in appletalk introduced a use-after-free problem,
where atalk_destroy_socket frees a sock, but we still release
the socket lock on it.
An easy fix is to take an extra reference on the sock and sock_put
it when returning from atalk_release.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Commit b0d0d915d1 (remove the BKL) added a regression, because
sock_put() can free memory while we are going to use it later.
Fix is to delay sock_put() _after_ release_sock().
Reported-by: Ingo Molnar <mingo@elte.hu>
Tested-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
We dont need to test if we run from softirq context, we definitely are.
This saves few instructions in ip_rcv() & ip_rcv_finish()
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
A struct used in the l2tp_eth driver for registering network namespace
ops was incorrectly marked as __net_initdata, leading to oops when
module unloaded.
BUG: unable to handle kernel paging request at ffffffffa00ec098
IP: [<ffffffff8123dbd8>] ops_exit_list+0x7/0x4b
PGD 142d067 PUD 1431063 PMD 195da8067 PTE 0
Oops: 0000 [#1] SMP
last sysfs file: /sys/module/l2tp_eth/refcnt
Call Trace:
[<ffffffff8123dc94>] ? unregister_pernet_operations+0x32/0x93
[<ffffffff8123dd20>] ? unregister_pernet_device+0x2b/0x38
[<ffffffff81068b6e>] ? sys_delete_module+0x1b8/0x222
[<ffffffff810c7300>] ? do_munmap+0x254/0x318
[<ffffffff812c64e5>] ? page_fault+0x25/0x30
[<ffffffff812c6952>] ? system_call_fastpath+0x16/0x1b
Signed-off-by: James Chapman <jchapman@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
'buffer' string is copied from userspace. It is not checked whether it is
zero terminated. This may lead to overflow inside of simple_strtoul().
Changli Gao suggested to copy not more than user supplied 'size' bytes.
It was introduced before the git epoch. Files "ipt_CLUSTERIP/*" are
root writable only by default, however, on some setups permissions might be
relaxed to e.g. network admin user.
Signed-off-by: Vasiliy Kulikov <segoon@openwall.com>
Acked-by: Changli Gao <xiaosuo@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
commit f3c5c1bfd4 (make ip_tables reentrant) introduced a race in
handling the stackptr restore, at the end of ipt_do_table()
We should do it before the call to xt_info_rdunlock_bh(), or we allow
cpu preemption and another cpu overwrites stackptr of original one.
A second fix is to change the underflow test to check the origptr value
instead of 0 to detect underflow, or else we allow a jump from different
hooks.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
The revision of the set type was not checked at the create command: if the
userspace sent a valid set type but with not supported revision number,
it'd create a loop.
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Patrick McHardy <kaber@trash.net>
The hash:*port* types with IPv4 silently ignored when address ranges
with non TCP/UDP were added/deleted from the set and used the first
address from the range only.
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Patrick McHardy <kaber@trash.net>
When the OF device driver bits were converted over to the platform
device infrastructure in commit 74888760d4
("dt/net: Eliminate users of of_platform_{,un}register_driver") we
inadvertantly created probing problems in the OF case.
The NIU driver creates a dummy platform device to represent the
board that contains one or more child NIU devices. Unfortunately
we use the same name, "niu", as the OF device driver itself uses.
The result is that we try to probe the dummy "niu" parent device we
create, and since it has a NULL ofdevice pointer etc. everything
explodes:
[783019.128243] niu: niu.c:v1.1 (Apr 22, 2010)
[783019.128810] Unable to handle kernel NULL pointer dereference
[783019.128949] tsk->{mm,active_mm}->context = 000000000000039e
[783019.129078] tsk->{mm,active_mm}->pgd = fffff803afc5a000
[783019.129206] \|/ ____ \|/
[783019.129213] "@'/ .. \`@"
[783019.129220] /_| \__/ |_\
[783019.129226] \__U_/
[783019.129378] modprobe(2004): Oops [#1]
[783019.129423] TSTATE: 0000000011001602 TPC: 0000000010052ff8 TNPC: 000000000061bbb4 Y: 00000000 Not tainted
[783019.129542] TPC: <niu_of_probe+0x3c/0x2dc [niu]>
[783019.129624] g0: 8080000000000000 g1: 0000000000000000 g2: 0000000010056000 g3: 0000000000000002
[783019.129733] g4: fffff803fc1da0c0 g5: fffff800441e2000 g6: fffff803fba84000 g7: 0000000000000000
[783019.129842] o0: fffff803fe7df010 o1: 0000000010055700 o2: 0000000000000000 o3: fffff803fbacaca0
[783019.129951] o4: 0000000000000080 o5: 0000000000777908 sp: fffff803fba866e1 ret_pc: 0000000010052ff4
[783019.130083] RPC: <niu_of_probe+0x38/0x2dc [niu]>
[783019.130165] l0: fffff803fe7df010 l1: fffff803fbacafc0 l2: fffff803fbacaca0 l3: ffffffffffffffed
[783019.130273] l4: 0000000000000000 l5: 000000007fffffff l6: fffff803fba86f40 l7: 0000000000000001
[783019.130382] i0: fffff803fe7df000 i1: fffff803fc20aba0 i2: 0000000000000000 i3: 0000000000000001
[783019.130490] i4: 0000000000000000 i5: 0000000000000000 i6: fffff803fba867a1 i7: 000000000062038c
[783019.130614] I7: <platform_drv_probe+0xc/0x20>
Fix by simply renaming the parent device to "niu-board".
Signed-off-by: David S. Miller <davem@davemloft.net>
commit 54405cde76 (r8169: support control of advertising.)
introduced a bug in rtl8169_init_phy()
Reported-by: Piotr Hosowicz <piotr@hosowicz.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Oliver Neukum <oliver@neukum.org>
Cc: Francois Romieu <romieu@fr.zoreil.com>
Tested-by: Anca Emanuel <anca.emanuel@gmail.com>
Tested-by: Piotr Hosowicz <piotr@hosowicz.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
The calculation is off-by-one. It should be "end - start + 1". This
patch fixes it to use resource_size() instead. Oddly, the code already
uses resource size correctly a couple lines earlier when it calls
request_mem_region() for this memory.
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Now that we finally have __aligned_xx exported to userspace, convert
the headers that get exported over to the proper type.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Whenever we enter the IP stack proper from bridge netfilter we
need to ensure that the skb is in a form the IP stack expects
it to be in.
The entry point on NF_FORWARD did not meet the requirements of
the IP stack, therefore leading to potential crashes/panics.
This patch fixes the problem.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Commit c95b819ad7 (gre: Use needed_headroom)
made gre use needed_headroom instead of hard_header_len
This uncover a bug in vlan code.
We should make sure vlan devices take into account their
real_dev->needed_headroom or we risk a crash in ipgre_header(), because
we dont have enough room to push IP header in skb.
Reported-by: Diddi Oscarsson <diddi@diddi.se>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Patrick McHardy <kaber@trash.net>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This structure was accidentally defined such that its layout can
differ between 32-bit and 64-bit processes. Add compat structure
definitions and an ioctl wrapper function.
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Acked-by: Alexander Duyck <alexander.h.duyck@intel.com>
Cc: stable@kernel.org [2.6.30+]
Signed-off-by: David S. Miller <davem@davemloft.net>
__ethtool_set_sg does not check if dev->ethtool_ops->set_sg is defined
which can result in a NULL pointer dereference when ethtool is used to
change SG settings for drivers without SG support.
Signed-off-by: Roger Luethi <rl@hellgate.ch>
Reviewed-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
struct aunhdr has 4 padding bytes between 'pad' and 'handle' fields on
x86_64. These bytes are not initialized in the variable 'ah' before
sending 'ah' to the network. This leads to 4 bytes kernel stack
infoleak.
This bug was introduced before the git epoch.
Signed-off-by: Vasiliy Kulikov <segoon@openwall.com>
Acked-by: Phil Blundell <philb@gnu.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
As specified by errata eTSEC49 of MPC8548 and errata eTSEC12 of MPC83xx,
older revisions of gianfar controllers will be unable to calculate a TCP/UDP
packet checksum for some alignments of the appropriate FCB. This patch checks
for FCB alignment on such controllers and falls back to software checksumming
if the alignment is known to be bad.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
* 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6:
PCI: label: remove #include of ACPI header to avoid warnings
PCI: label: Fix compilation error when CONFIG_ACPI is unset
PCI: pre-allocate additional resources to devices only after successful allocation of essential resources.
PCI: introduce reset_resource()
PCI: data structure agnostic free list function
PCI: refactor io size calculation code
PCI: do not create quirk I/O regions below PCIBIOS_MIN_IO for ICH
PCI hotplug: acpiphp: set current_state to D0 in register_slot
PCI: Export ACPI _DSM provided firmware instance number and string name to sysfs
PCI: add more checking to ICH region quirks
PCI: aer-inject: Override PCIe AER Mask Registers
PCI: fix tlan build when CONFIG_PCI is not enabled
PCI: remove quirk for pre-production systems
PCI: Avoid potential NULL pointer dereference in pci_scan_bridge
PCI/lpc: irq and pci_ids patch for Intel DH89xxCC DeviceIDs
PCI: sysfs: Fix failure path for addition of "vpd" attribute
* 'spi/next' of git://git.secretlab.ca/git/linux-2.6: (34 commits)
spi/dw_spi: move dw_spi.h into drivers/spi
spi/dw_spi: Fix missing header
gpio/langwell: Clear edge bit before handling
gpio/langwell: Simplify demux loop
gpio/langwell: Convert irq name space
gpio/langwell: Fix broken irq_eoi change.
gpio; Make Intel chipset gpio drivers depend on x86
gpio/cs5535-gpio: Fix section mismatch
spi/rtc-{ds1390,ds3234,m41t94}: Use spi_get_drvdata() for SPI devices
spi/davinci: Support DMA transfers larger than 65535 words
spi/davinci: Use correct length parameter to dma_map_single calls
gpio: Use __devexit at necessary places
gpio: add MODULE_DEVICE_TABLE to pch_gpio and ml_ioh_gpio
gpio/mcp23s08: support mcp23s17 variant
of_mmc_spi: add card detect irq support
spi/omap_mcspi: catch xfers of non-multiple SPI word size
spi/omap_mcspi: Off-by-one error in finding the right divisor
gpio/pca953x: Fix wrong pointer type
spi/pl022: rid dangling labels
spi: add support for SuperH SPI
...
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm:
dlm: use alloc_workqueue function
dlm: increase default hash table sizes
dlm: record full callback state
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6:
fs: call security_d_instantiate in d_obtain_alias V2
lose 'mounting_here' argument in ->d_manage()
don't pass 'mounting_here' flag to follow_down()
change the locking order for namespace_sem
fix deadlock in pivot_root()
vfs: split off vfsmount-related parts of vfs_kern_mount()
Some fixes for pstore
kill simple_set_mnt()
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/bcopeland/omfs:
omfs: make readdir stop when filldir says so
omfs: merge unlink() and rmdir(), close leak in rename()
omfs: stop playing silly buggers with omfs_unlink() in ->rename()
omfs: rename() needs to mark old_inode dirty after ctime update
* 'linux-next' of git://git.infradead.org/ubifs-2.6: (25 commits)
UBIFS: clean-up commentaries
UBIFS: save 128KiB or more RAM
UBIFS: allocate orphans scan buffer on demand
UBIFS: allocate lpt dump buffer on demand
UBIFS: allocate ltab checking buffer on demand
UBIFS: allocate scanning buffer on demand
UBIFS: allocate dump buffer on demand
UBIFS: do not check data crc by default
UBIFS: simplify UBIFS Kconfig menu
UBIFS: print max. index node size
UBIFS: handle allocation failures in UBIFS write path
UBIFS: use max_write_size during recovery
UBIFS: use max_write_size for write-buffers
UBIFS: introduce write-buffer size field
UBI: incorporate LEB offset information
UBIFS: incorporate maximum write size
UBI: provide LEB offset information
UBI: incorporate maximum write size
UBIFS: fix LEB number in printk
UBIFS: restrict world-writable debugfs files
...
* 'linux-next' of git://git.infradead.org/ubi-2.6:
UBI: make tests modes dynamic
UBI: make self-checks dynamic
UBI: make debugging messages dynamic
UBI: remove UBI_IO_DEBUG macro
UBI: kill debugging buffer
UBI: allocate erase checking buffer on demand
UBI: allocate write checking buffer on demand
UBI: always re-read in case of read failures
UBI: cleanup comments about corrupted PEBs
UBI: add slab cache for ubi_scan_leb objects
UBI: use raw mtd read function in debugging code
UBI: try to reveal buggy MTD drivers
UBI: add a commentary about allocating VID header buffer on stack
UBI: cleanup LEB start calculations
UBI: fix NOR erase preparation quirk
* 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
x86: Flush TLB if PGD entry is changed in i386 PAE mode
x86, dumpstack: Correct stack dump info when frame pointer is available
x86: Clean up csum-copy_64.S a bit
x86: Fix common misspellings
x86: Fix misspelling and align params
x86: Use PentiumPro-optimized partial_csum() on VIA C7
* 'irq-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
genirq: Fix incorrect unlock in __setup_irq()
cris: Use generic show_interrupts()
genirq: show_interrupts: Check desc->name before printing it blindly
cris: Use accessor functions to set IRQ_PER_CPU flag
cris: Fix irq conversion fallout
* 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
sched, kernel-doc: Fix runqueue_is_locked() description
* 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (30 commits)
trace, filters: Initialize the match variable in process_ops() properly
trace, documentation: Fix branch profiling location in debugfs
oprofile, s390: Cleanups
oprofile, s390: Remove hwsampler_files.c and merge it into init.c
perf: Fix tear-down of inherited group events
perf: Reorder & optimize perf_event_context to remove alignment padding on 64 bit builds
perf: Handle stopped state with tracepoints
perf: Fix the software events state check
perf, powerpc: Handle events that raise an exception without overflowing
perf, x86: Use INTEL_*_CONSTRAINT() for all PEBS event constraints
perf, x86: Clean up SandyBridge PEBS events
perf lock: Fix sorting by wait_min
perf tools: Version incorrect with some versions of grep
perf evlist: New command to list the names of events present in a perf.data file
perf script: Add support for H/W and S/W events
perf script: Add support for dumping symbols
perf script: Support custom field selection for output
perf script: Move printing of 'common' data from print_event and rename
perf tracing: Remove print_graph_cpu and print_graph_proc from trace-event-parse
perf script: Change process_event prototype
...
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (47 commits)
doc: CONFIG_UNEVICTABLE_LRU doesn't exist anymore
Update cpuset info & webiste for cgroups
dcdbas: force SMI to happen when expected
arch/arm/Kconfig: remove one to many l's in the word.
asm-generic/user.h: Fix spelling in comment
drm: fix printk typo 'sracth'
Remove one to many n's in a word
Documentation/filesystems/romfs.txt: fixing link to genromfs
drivers:scsi Change printk typo initate -> initiate
serial, pch uart: Remove duplicate inclusion of linux/pci.h header
fs/eventpoll.c: fix spelling
mm: Fix out-of-date comments which refers non-existent functions
drm: Fix printk typo 'failled'
coh901318.c: Change initate to initiate.
mbox-db5500.c Change initate to initiate.
edac: correct i82975x error-info reported
edac: correct i82975x mci initialisation
edac: correct commented info
fs: update comments to point correct document
target: remove duplicate include of target/target_core_device.h from drivers/target/target_core_hba.c
...
Trivial conflict in fs/eventpoll.c (spelling vs addition)
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid: (48 commits)
HID: add support for Logitech Driving Force Pro wheel
HID: hid-ortek: remove spurious reference
HID: add support for Ortek PKB-1700
HID: roccat-koneplus: vorrect mode of sysfs attr 'sensor'
HID: hid-ntrig: init settle and mode check
HID: merge hid-egalax into hid-multitouch
HID: hid-multitouch: Send events per slot if CONTACTCOUNT is missing
HID: ntrig remove if and drop an indent
HID: ACRUX - activate the device immediately after binding
HID: ntrig: apply NO_INIT_REPORTS quirk
HID: hid-magicmouse: Correct touch orientation direction
HID: ntrig don't dereference unclaimed hidinput
HID: Do not create input devices for feature reports
HID: bt hidp: send Output reports using SET_REPORT on the Control channel
HID: hid-sony.c: Fix sending Output reports to the Sixaxis
HID: add support for Keytouch IEC 60945
HID: Add HID Report Descriptor to sysfs
HID: add IRTOUCH infrared USB to hid_have_special_driver
HID: kernel oops in out_cleanup in function hidinput_connect
HID: Add teletext/color keys - gyration remote - EU version (GYAR3101CKDE)
...
include/linux/dw_spi.h only includes driver internal data. It doesn't
expose a platform_data configuration structure or similar (at least
nothing in-tree). This patch moves the header into drivers/spi so
that the scope is limited to only the dw_spi_*.c driver files
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Cc: Feng Tang <feng.tang@intel.com>
Cc: spi-devel-general@lists.sourceforge.net
Currently, build on PPC dies with:
In file included from drivers/spi/dw_spi_mmio.c:16:
include/linux/spi/dw_spi.h:147: error: field ‘tx_sgl’ has incomplete type
include/linux/spi/dw_spi.h:149: error: field ‘rx_sgl’ has incomplete type
Add linux/scatterlist.h include to dw_spi.h, because we need to know
the contents of the structure.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
While trying to track down some NFS problems with BTRFS, I kept noticing I was
getting -EACCESS for no apparent reason. Eric Paris and printk() helped me
figure out that it was SELinux that was giving me grief, with the following
denial
type=AVC msg=audit(1290013638.413:95): avc: denied { 0x800000 } for pid=1772
comm="nfsd" name="" dev=sda1 ino=256 scontext=system_u:system_r:kernel_t:s0
tcontext=system_u:object_r:unlabeled_t:s0 tclass=file
Turns out this is because in d_obtain_alias if we can't find an alias we create
one and do all the normal instantiation stuff, but we don't do the
security_d_instantiate.
Usually we are protected from getting a hashed dentry that hasn't yet run
security_d_instantiate() by the parent's i_mutex, but obviously this isn't an
option there, so in order to deal with the case that a second thread comes in
and finds our new dentry before we get to run security_d_instantiate(), we go
ahead and call it if we find a dentry already. Eric assures me that this is ok
as the code checks to see if the dentry has been initialized already so calling
security_d_instantiate() against the same dentry multiple times is ok. With
this patch I'm no longer getting errant -EACCESS values.
Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Make sure the 'match' variable always has a value.
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
