- 05 Jan, 2018 15 commits
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Hugh Dickins authored
There's a 0x1000 in various places, which looks better with a name. Signed-off-by:
Hugh Dickins <hughd@google.com> Acked-by:
Jiri Kosina <jkosina@suse.cz> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Hugh Dickins authored
While trying to get our gold link to work, four cleanups: matched the gdt_page declaration to its definition; in fiddling unsuccessfully with PERCPU_INPUT(), lined up backslashes; lined up the backslashes according to convention in percpu-defs.h; deleted the unused irq_stack_pointer addition to irq_stack_union. Sad to report that aligning backslashes does not appear to help gold align to 8192: but while these did not help, they are worth keeping. Signed-off-by:
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Hugh Dickins authored
When removing the bogus comment from kaiser_remove_mapping(), I really ought to have checked the extent of its bogosity: as Neel points out, there is nothing to stop unmap_pud_range_nofree() from continuing beyond the end of a pud (and starting in the wrong position on the next). Fix kaiser_remove_mapping() to constrain the extent and advance pgd pointer correctly: use pgd_addr_end() macro as used throughout base mm (but don't assume page-rounded start and size in this case). But this bug was very unlikely to trigger in this backport: since any buddy allocation is contained within a single pud extent, and we are not using vmapped stacks (and are only mapping one page of stack anyway): the only way to hit this bug here would be when freeing a large modified ldt. Signed-off-by:
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Hugh Dickins authored
Yes, unmap_pud_range_nofree()'s declaration ought to be in a header file really, but I'm not sure we want to use it anyway: so for now just declare it inside kaiser_remove_mapping(). And there doesn't seem to be such a thing as unmap_p4d_range(), even in a 5-level paging tree. Signed-off-by:
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Hugh Dickins authored
Mainly deleting a surfeit of blank lines, and reflowing header comment. Signed-off-by:
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Hugh Dickins authored
kaiser_add_user_map() took no notice when kaiser_pagetable_walk() failed. And avoid its might_sleep() when atomic (though atomic at present unused). Signed-off-by:
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Hugh Dickins authored
Avoid perf crashes: place debug_store in the user-mapped per-cpu area instead of allocating, and use page allocator plus kaiser_add_mapping() to keep the BTS and PEBS buffers user-mapped (that is, present in the user mapping, though visible only to kernel and hardware). The PEBS fixup buffer does not need this treatment. The need for a user-mapped struct debug_store showed up before doing any conscious perf testing: in a couple of kernel paging oopses on Westmere, implicating the debug_store offset of the per-cpu area. Signed-off-by:
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Hugh Dickins authored
pjt has observed that nmi's second (nmi_from_kernel) call to do_nmi() adjusted the %rdi regs arg, rightly when CONFIG_KAISER, but wrongly when not CONFIG_KAISER. Although the minimal change is to add an #ifdef CONFIG_KAISER around the addq line, that looks cluttered, and I prefer how the first call to do_nmi() handled it: prepare args in %rdi and %rsi before getting into the CONFIG_KAISER block, since it does not touch them at all. And while we're here, place the "#ifdef CONFIG_KAISER" that follows each, to enclose the "Unconditionally restore CR3" comment: matching how the "Unconditionally use kernel CR3" comment above is enclosed. Signed-off-by:
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Hugh Dickins authored
It is absurd that KAISER should depend on SMP, but apparently nobody has tried a UP build before: which breaks on implicit declaration of function 'per_cpu_offset' in arch/x86/mm/kaiser.c. Now, you would expect that to be trivially fixed up; but looking at the System.map when that block is #ifdef'ed out of kaiser_init(), I see that in a UP build __per_cpu_user_mapped_end is precisely at __per_cpu_user_mapped_start, and the items carefully gathered into that section for user-mapping on SMP, dispersed elsewhere on UP. So, some other kind of section assignment will be needed on UP, but implementing that is not a priority: just make KAISER depend on SMP for now. Also inserted a blank line before the option, tidied up the brief Kconfig help message, and added an "If unsure, Y". Signed-off-by:
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Hugh Dickins authored
Include linux/kaiser.h instead of asm/kaiser.h to build ldt.c without CONFIG_KAISER. kaiser_add_mapping() does already return an error code, so fix the FIXME. Signed-off-by:
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Hugh Dickins authored
Kaiser only needs to map one page of the stack; and kernel/fork.c did not build on powerpc (no __PAGE_KERNEL). It's all cleaner if linux/kaiser.h provides kaiser_map_thread_stack() and kaiser_unmap_thread_stack() wrappers around asm/kaiser.h's kaiser_add_mapping() and kaiser_remove_mapping(). And use linux/kaiser.h in init/main.c to avoid the #ifdefs there. Signed-off-by:
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Hugh Dickins authored
native_pgd_clear() uses native_set_pgd(), so native_set_pgd() must avoid setting the _PAGE_NX bit on an otherwise pgd_none() entry: usually that just generated a warning on exit, but sometimes more mysterious and damaging failures (our production machines could not complete booting). The original fix to this just avoided adding _PAGE_NX to an empty entry; but eventually more problems surfaced with kexec, and EFI mapping expected to be a problem too. So now instead change native_set_pgd() to update shadow only if _PAGE_USER: A few places (kernel/machine_kexec_64.c, platform/efi/efi_64.c for sure) use set_pgd() to set up a temporary internal virtual address space, with physical pages remapped at what Kaiser regards as userspace addresses: Kaiser then assumes a shadow pgd follows, which it will try to corrupt. This appears to be responsible for the recent kexec and kdump failures; though it's unclear how those did not manifest as a problem before. Ah, the shadow pgd will only be assumed to "follow" if the requested pgd is on an even-numbered page: so I suppose it was going wrong 50% of the time all along. What we need is a flag to set_pgd(), to tell it we're dealing with userspace. Er, isn't that what the pgd's _PAGE_USER bit is saying? Add a test for that. But we cannot do the same for pgd_clear() (which may be called to clear corrupted entries - set aside the question of "corrupt in which pgd?" until later), so there just rely on pgd_clear() not being called in the problematic cases - with a WARN_ON_ONCE() which should fire half the time if it is. But this is getting too big for an inline function: move it into arch/x86/mm/kaiser.c (which then demands a boot/compressed mod); and de-void and de-space native_get_shadow/normal_pgd() while here. Signed-off-by:
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Dave Hansen authored
Merged fixes and cleanups, rebased to 4.4.89 tree (no 5-level paging). Signed-off-by:
Dave Hansen <dave.hansen@linux.intel.com> Signed-off-by:
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Richard Fellner authored
This patch introduces our implementation of KAISER (Kernel Address Isolation to have Side-channels Efficiently Removed), a kernel isolation technique to close hardware side channels on kernel address information. More information about the patch can be found on: https://github.com/IAIK/KAISER From: Richard Fellner <richard.fellner@student.tugraz.at> From: Daniel Gruss <daniel.gruss@iaik.tugraz.at> X-Subject: [RFC, PATCH] x86_64: KAISER - do not map kernel in user mode Date: Thu, 4 May 2017 14:26:50 +0200 Link: http://marc.info/?l=linux-kernel&m=149390087310405&w=2 Kaiser-4.10-SHA1: c4b1831d44c6144d3762ccc72f0c4e71a0c713e5 To: <linux-kernel@vger.kernel.org> To: <kernel-hardening@lists.openwall.com> Cc: <clementine.maurice@iaik.tugraz.at> Cc: <moritz.lipp@iaik.tugraz.at> Cc: Michael Schwarz <michael.schwarz@iaik.tugraz.at> Cc: Richard Fellner <richard.fellner@student.tugraz.at> Cc: Ingo Molnar <mingo@kernel.org> Cc: <kirill.shutemov@linux.intel.com> Cc: <anders.fogh@gdata-adan.de> After several recent works [1,2,3] KASLR on x86_64 was basically considered dead by many researchers. We have been working on an efficient but effective fix for this problem and found that not mapping the kernel space when running in user mode is the solution to this problem [4] (the corresponding paper [5] will be presented at ESSoS17). With this RFC patch we allow anybody to configure their kernel with the flag CONFIG_KAISER to add our defense mechanism. If there are any questions we would love to answer them. We also appreciate any comments! Cheers, Daniel (+ the KAISER team from Graz University of Technology) [1] http://www.ieee-security.org/TC/SP2013/papers/4977a191.pdf [2] https://www.blackhat.com/docs/us-16/materials/us-16-Fogh-Using-Undocumented-CPU-Behaviour-To-See-Into-Kernel-Mode-And-Break-KASLR-In-The-Process.pdf [3] https://www.blackhat.com/docs/us-16/materials/us-16-Jang-Breaking-Kernel-Address-Space-Layout-Randomization-KASLR-With-Intel-TSX.pdf [4] https://github.com/IAIK/KAISER [5] https://gruss.cc/files/kaiser.pdf [patch based also on https://raw.githubusercontent.com/IAIK/KAISER/master/KAISER/0001-KAISER-Kernel-Address-Isolation.patch] Signed-off-by:Richard Fellner <richard.fellner@student.tugraz.at> Signed-off-by:
Moritz Lipp <moritz.lipp@iaik.tugraz.at> Signed-off-by:
Daniel Gruss <daniel.gruss@iaik.tugraz.at> Signed-off-by:
Michael Schwarz <michael.schwarz@iaik.tugraz.at> Acked-by:
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Tom Lendacky authored
commit e505371d upstream. Add a cmdline_find_option() function to look for cmdline options that take arguments. The argument is returned in a supplied buffer and the argument length (regardless of whether it fits in the supplied buffer) is returned, with -1 indicating not found. Signed-off-by:
Tom Lendacky <thomas.lendacky@amd.com> Reviewed-by:
Thomas Gleixner <tglx@linutronix.de> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brijesh Singh <brijesh.singh@amd.com> Cc: Dave Young <dyoung@redhat.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Larry Woodman <lwoodman@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Matt Fleming <matt@codeblueprint.co.uk> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: Rik van Riel <riel@redhat.com> Cc: Toshimitsu Kani <toshi.kani@hpe.com> Cc: kasan-dev@googlegroups.com Cc: kvm@vger.kernel.org Cc: linux-arch@vger.kernel.org Cc: linux-doc@vger.kernel.org Cc: linux-efi@vger.kernel.org Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/36b5f97492a9745dce27682305f990fc20e5cf8a.1500319216.git.thomas.lendacky@amd.comSigned-off-by:
Ingo Molnar <mingo@kernel.org> Signed-off-by:
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- 02 Jan, 2018 25 commits
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Greg Kroah-Hartman authored
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Andy Lutomirski authored
commit 5dd0b16c upstream. This fixes CONFIG_SMP=n, CONFIG_DEBUG_TLBFLUSH=y without introducing further #ifdef soup. Caught by a Kbuild bot randconfig build. Signed-off-by:
Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Fixes: ce4a4e56 ("x86/mm: Remove the UP asm/tlbflush.h code, always use the (formerly) SMP code") Link: http://lkml.kernel.org/r/76da9a3cc4415996f2ad2c905b93414add322021.1496673616.git.luto@kernel.orgSigned-off-by:
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Linus Torvalds authored
commit 966031f3 upstream. We added support for EXTPROC back in 2010 in commit 26df6d13 ("tty: Add EXTPROC support for LINEMODE") and the intent was to allow it to override some (all?) ICANON behavior. Quoting from that original commit message: There is a new bit in the termios local flag word, EXTPROC. When this bit is set, several aspects of the terminal driver are disabled. Input line editing, character echo, and mapping of signals are all disabled. This allows the telnetd to turn off these functions when in linemode, but still keep track of what state the user wants the terminal to be in. but the problem turns out that "several aspects of the terminal driver are disabled" is a bit ambiguous, and you can really confuse the n_tty layer by setting EXTPROC and then causing some of the ICANON invariants to no longer be maintained. This fixes at least one such case (TIOCINQ) becoming unhappy because of the confusion over whether ICANON really means ICANON when EXTPROC is set. This basically makes TIOCINQ match the case of read: if EXTPROC is set, we ignore ICANON. Also, make sure to reset the ICANON state ie EXTPROC changes, not just if ICANON changes. Fixes: 26df6d13 ("tty: Add EXTPROC support for LINEMODE") Reported-by:
Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Reported-by:
syzkaller <syzkaller@googlegroups.com> Cc: Jiri Slaby <jslaby@suse.com> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
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Thomas Gleixner authored
commit 322f8b8b upstream. smpboot_setup_warm_reset_vector() and smpboot_restore_warm_reset_vector() invoke local_flush_tlb() for no obvious reason. Digging in history revealed that the original code in the 2.1 era added those because the code manipulated a swapper_pg_dir pagetable entry. The pagetable manipulation was removed long ago in the 2.3 timeframe, but the TLB flush invocations stayed around forever. Remove them along with the pointless pr_debug()s which come from the same 2.1 change. Reported-by:
Dominik Brodowski <linux@dominikbrodowski.net> Signed-off-by:
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Thomas Gleixner authored
commit 5d62c183 upstream. The conditions in irq_exit() to invoke tick_nohz_irq_exit() which subsequently invokes tick_nohz_stop_sched_tick() are: if ((idle_cpu(cpu) && !need_resched()) || tick_nohz_full_cpu(cpu)) If need_resched() is not set, but a timer softirq is pending then this is an indication that the softirq code punted and delegated the execution to softirqd. need_resched() is not true because the current interrupted task takes precedence over softirqd. Invoking tick_nohz_irq_exit() in this case can cause an endless loop of timer interrupts because the timer wheel contains an expired timer, but softirqs are not yet executed. So it returns an immediate expiry request, which causes the timer to fire immediately again. Lather, rinse and repeat.... Prevent that by adding a check for a pending timer soft interrupt to the conditions in tick_nohz_stop_sched_tick() which avoid calling get_next_timer_interrupt(). That keeps the tick sched timer on the tick and prevents a repetitive programming of an already expired timer. Reported-by:
Sebastian Siewior <bigeasy@linutronix.d> Signed-off-by:
Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Paul McKenney <paulmck@linux.vnet.ibm.com> Cc: Anna-Maria Gleixner <anna-maria@linutronix.de> Cc: Sebastian Siewior <bigeasy@linutronix.de> Link: https://lkml.kernel.org/r/alpine.DEB.2.20.1712272156050.2431@nanosSigned-off-by:
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Daniel Thompson authored
commit da997066 upstream. When plugging in a USB webcam I see the following message: xhci_hcd 0000:04:00.0: WARN Successful completion on short TX: needs XHCI_TRUST_TX_LENGTH quirk? handle_tx_event: 913 callbacks suppressed All is quiet again with this patch (and I've done a fair but of soak testing with the camera since). Signed-off-by:
Daniel Thompson <daniel.thompson@linaro.org> Acked-by:
Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by:
Mathias Nyman <mathias.nyman@linux.intel.com> Signed-off-by:
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Mathias Nyman authored
commit 07b9f128 upstream. USB 3.1 devices are not detected as 3.1 capable since 4.15-rc3 due to a off by one in commit 81cf4a45 ("USB: core: Add type-specific length check of BOS descriptors") It uses USB_DT_USB_SSP_CAP_SIZE() to get SSP capability size which takes the zero based SSAC as argument, not the actual count of sublink speed attributes. USB3 spec 9.6.2.5 says "The number of Sublink Speed Attributes = SSAC + 1." The type-specific length check patch was added to stable and needs to be fixed there as well Fixes: 81cf4a45 ("USB: core: Add type-specific length check of BOS descriptors") CC: Masakazu Mokuno <masakazu.mokuno@gmail.com> Signed-off-by:
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Oliver Neukum authored
commit b9096d9f upstream. This modem needs this quirk to operate. It produces timeouts when resumed without reset. Signed-off-by:
Oliver Neukum <oneukum@suse.com> Signed-off-by:
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Dmitry Fleytman Dmitry Fleytman authored
commit 7f038d25 upstream. Commit e0429362 ("usb: Add device quirk for Logitech HD Pro Webcams C920 and C930e") introduced quirk to workaround an issue with some Logitech webcams. There is one more model that has the same issue - C925e, so applying the same quirk as well. See aforementioned commit message for detailed explanation of the problem. Signed-off-by:
Dmitry Fleytman <dmitry.fleytman@gmail.com> Signed-off-by:
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SZ Lin (林上智) authored
commit 3920bb71 upstream. This patch adds support for YUGA CLM920-NC5 PID 0x9625 USB modem to option driver. Interface layout: 0: QCDM/DIAG 1: ADB 2: MODEM 3: AT 4: RMNET Signed-off-by:
Taiyi Wu <taiyity.wu@moxa.com> Signed-off-by:
SZ Lin (林上智) <sz.lin@moxa.com> Signed-off-by:
Johan Hovold <johan@kernel.org> Signed-off-by:
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Daniele Palmas authored
commit 08933099 upstream. This patch adds support for PID 0x1101 of Telit ME910. Signed-off-by:
Daniele Palmas <dnlplm@gmail.com> Signed-off-by:
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Reinhard Speyerer authored
commit 92a18a65 upstream. Sierra Wireless EM7565 devices use the QCSERIAL_SWI layout for their serial ports T: Bus=01 Lev=03 Prnt=29 Port=01 Cnt=02 Dev#= 31 Spd=480 MxCh= 0 D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=1199 ProdID=9091 Rev= 0.06 S: Manufacturer=Sierra Wireless, Incorporated S: Product=Sierra Wireless EM7565 Qualcomm Snapdragon X16 LTE-A S: SerialNumber=xxxxxxxx C:* #Ifs= 4 Cfg#= 1 Atr=a0 MxPwr=500mA I:* If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=qcserial E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms E: Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms I:* If#= 2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=qcserial E: Ad=83(I) Atr=03(Int.) MxPS= 10 Ivl=32ms E: Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms I:* If#= 3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=qcserial E: Ad=85(I) Atr=03(Int.) MxPS= 10 Ivl=32ms E: Ad=84(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms E: Ad=03(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms I:* If#= 8 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=qmi_wwan E: Ad=86(I) Atr=03(Int.) MxPS= 8 Ivl=32ms E: Ad=8e(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms E: Ad=0f(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms but need sendsetup = true for the NMEA port to make it work properly. Simplify the patch compared to v1 as suggested by Bjørn Mork by taking advantage of the fact that existing devices work with sendsetup = true too. Use sendsetup = true for the NMEA interface of QCSERIAL_SWI and add DEVICE_SWI entries for the EM7565 PID 0x9091 and the EM7565 QDL PID 0x9090. Tests with several MC73xx/MC74xx/MC77xx devices have been performed in order to verify backward compatibility. Signed-off-by:
Reinhard Speyerer <rspmn@arcor.de> Signed-off-by:
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Max Schulze authored
commit c6a36ad3 upstream. Add AIRBUS_DS_P8GR device IDs to ftdi_sio driver. Signed-off-by:
Max Schulze <max.schulze@posteo.de> Signed-off-by:
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Shuah Khan authored
commit 8272d099 upstream. Remove and/or change debug, info. and error messages to not print kernel pointer addresses. Signed-off-by:
Shuah Khan <shuahkh@osg.samsung.com> Signed-off-by:
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Shuah Khan authored
commit 248a2204 upstream. Remove and/or change debug, info. and error messages to not print kernel pointer addresses. Signed-off-by:
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Juan Zea authored
commit 544c4605 upstream. usbip bind writes commands followed by random string when writing to match_busid attribute in sysfs, caused by using full variable size instead of string length. Signed-off-by:
Juan Zea <juan.zea@qindel.com> Acked-by:
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Willem de Bruijn authored
[ Upstream commit 35b99dff ] skb_complete_tx_timestamp must ingest the skb it is passed. Call kfree_skb if the skb cannot be enqueued. Fixes: b245be1f ("net-timestamp: no-payload only sysctl") Fixes: 9ac25fc0 ("net: fix socket refcounting in skb_complete_tx_timestamp()") Reported-by:
Richard Cochran <richardcochran@gmail.com> Signed-off-by:
Willem de Bruijn <willemb@google.com> Reviewed-by:
Eric Dumazet <edumazet@google.com> Signed-off-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
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Grygorii Strashko authored
[ Upstream commit c1a8d0a3 ] Under some circumstances driver will perform PHY reset in ksz9031_read_status() to fix autoneg failure case (idle error count = 0xFF). When this happens ksz9031 will not detect link status change any more when connecting to Netgear 1G switch (link can be recovered sometimes by restarting netdevice "ifconfig down up"). Reproduced with TI am572x board equipped with ksz9031 PHY while connecting to Netgear 1G switch. Fix the issue by reconfiguring autonegotiation after PHY reset in ksz9031_read_status(). Fixes: d2fd719b ("net/phy: micrel: Add workaround for bad autoneg") Signed-off-by:
Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by:
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Eric W. Biederman authored
[ Upstream commit 21b59443 ] (I can trivially verify that that idr_remove in cleanup_net happens after the network namespace count has dropped to zero --EWB) Function get_net_ns_by_id() does not check for net::count after it has found a peer in netns_ids idr. It may dereference a peer, after its count has already been finaly decremented. This leads to double free and memory corruption: put_net(peer) rtnl_lock() atomic_dec_and_test(&peer->count) [count=0] ... __put_net(peer) get_net_ns_by_id(net, id) spin_lock(&cleanup_list_lock) list_add(&net->cleanup_list, &cleanup_list) spin_unlock(&cleanup_list_lock) queue_work() peer = idr_find(&net->netns_ids, id) | get_net(peer) [count=1] | ... | (use after final put) v ... cleanup_net() ... spin_lock(&cleanup_list_lock) ... list_replace_init(&cleanup_list, ..) ... spin_unlock(&cleanup_list_lock) ... ... ... ... put_net(peer) ... atomic_dec_and_test(&peer->count) [count=0] ... spin_lock(&cleanup_list_lock) ... list_add(&net->cleanup_list, &cleanup_list) ... spin_unlock(&cleanup_list_lock) ... queue_work() ... rtnl_unlock() rtnl_lock() ... for_each_net(tmp) { ... id = __peernet2id(tmp, peer) ... spin_lock_irq(&tmp->nsid_lock) ... idr_remove(&tmp->netns_ids, id) ... ... ... net_drop_ns() ... net_free(peer) ... } ... | v cleanup_net() ... (Second free of peer) Also, put_net() on the right cpu may reorder with left's cpu list_replace_init(&cleanup_list, ..), and then cleanup_list will be corrupted. Since cleanup_net() is executed in worker thread, while put_net(peer) can happen everywhere, there should be enough time for concurrent get_net_ns_by_id() to pick the peer up, and the race does not seem to be unlikely. The patch fixes the problem in standard way. (Also, there is possible problem in peernet2id_alloc(), which requires check for net::count under nsid_lock and maybe_get_net(peer), but in current stable kernel it's used under rtnl_lock() and it has to be safe. Openswitch begun to use peernet2id_alloc(), and possibly it should be fixed too. While this is not in stable kernel yet, so I'll send a separate message to netdev@ later). Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by:
Kirill Tkhai <ktkhai@virtuozzo.com> Fixes: 0c7aecd4 "netns: add rtnl cmd to add and get peer netns ids" Reviewed-by:
Andrey Ryabinin <aryabinin@virtuozzo.com> Reviewed-by:
"Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by:
Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by:
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Nikolay Aleksandrov authored
[ Upstream commit 84aeb437 ] The early call to br_stp_change_bridge_id in bridge's newlink can cause a memory leak if an error occurs during the newlink because the fdb entries are not cleaned up if a different lladdr was specified, also another minor issue is that it generates fdb notifications with ifindex = 0. Another unrelated memory leak is the bridge sysfs entries which get added on NETDEV_REGISTER event, but are not cleaned up in the newlink error path. To remove this special case the call to br_stp_change_bridge_id is done after netdev register and we cleanup the bridge on changelink error via br_dev_delete to plug all leaks. This patch makes netlink bridge destruction on newlink error the same as dellink and ioctl del which is necessary since at that point we have a fully initialized bridge device. To reproduce the issue: $ ip l add br0 address 00:11:22:33:44:55 type bridge group_fwd_mask 1 RTNETLINK answers: Invalid argument $ rmmod bridge [ 1822.142525] ============================================================================= [ 1822.143640] BUG bridge_fdb_cache (Tainted: G O ): Objects remaining in bridge_fdb_cache on __kmem_cache_shutdown() [ 1822.144821] ----------------------------------------------------------------------------- [ 1822.145990] Disabling lock debugging due to kernel taint [ 1822.146732] INFO: Slab 0x0000000092a844b2 objects=32 used=2 fp=0x00000000fef011b0 flags=0x1ffff8000000100 [ 1822.147700] CPU: 2 PID: 13584 Comm: rmmod Tainted: G B O 4.15.0-rc2+ #87 [ 1822.148578] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014 [ 1822.150008] Call Trace: [ 1822.150510] dump_stack+0x78/0xa9 [ 1822.151156] slab_err+0xb1/0xd3 [ 1822.151834] ? __kmalloc+0x1bb/0x1ce [ 1822.152546] __kmem_cache_shutdown+0x151/0x28b [ 1822.153395] shutdown_cache+0x13/0x144 [ 1822.154126] kmem_cache_destroy+0x1c0/0x1fb [ 1822.154669] SyS_delete_module+0x194/0x244 [ 1822.155199] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 1822.155773] entry_SYSCALL_64_fastpath+0x23/0x9a [ 1822.156343] RIP: 0033:0x7f929bd38b17 [ 1822.156859] RSP: 002b:00007ffd160e9a98 EFLAGS: 00000202 ORIG_RAX: 00000000000000b0 [ 1822.157728] RAX: ffffffffffffffda RBX: 00005578316ba090 RCX: 00007f929bd38b17 [ 1822.158422] RDX: 00007f929bd9ec60 RSI: 0000000000000800 RDI: 00005578316ba0f0 [ 1822.159114] RBP: 0000000000000003 R08: 00007f929bff5f20 R09: 00007ffd160e8a11 [ 1822.159808] R10: 00007ffd160e9860 R11: 0000000000000202 R12: 00007ffd160e8a80 [ 1822.160513] R13: 0000000000000000 R14: 0000000000000000 R15: 00005578316ba090 [ 1822.161278] INFO: Object 0x000000007645de29 @offset=0 [ 1822.161666] INFO: Object 0x00000000d5df2ab5 @offset=128 Fixes: 30313a3d ("bridge: Handle IFLA_ADDRESS correctly when creating bridge device") Fixes: 5b8d5429 ("bridge: netlink: register netdevice before executing changelink") Signed-off-by:
Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by:
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Ido Schimmel authored
[ Upstream commit b4681c28 ] Since commit 0ddcf43d ("ipv4: FIB Local/MAIN table collapse") the local table uses the same trie allocated for the main table when custom rules are not in use. When a net namespace is dismantled, the main table is flushed and freed (via an RCU callback) before the local table. In case the callback is invoked before the local table is iterated, a use-after-free can occur. Fix this by iterating over the FIB tables in reverse order, so that the main table is always freed after the local table. v3: Reworded comment according to Alex's suggestion. v2: Add a comment to make the fix more explicit per Dave's and Alex's feedback. Fixes: 0ddcf43d ("ipv4: FIB Local/MAIN table collapse") Signed-off-by:
Ido Schimmel <idosch@mellanox.com> Reported-by:
Fengguang Wu <fengguang.wu@intel.com> Acked-by:
Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by:
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Tonghao Zhang authored
[ Upstream commit 8cb38a60 ] The patch(180d8cd9) replaces all uses of struct sock fields' memory_pressure, memory_allocated, sockets_allocated, and sysctl_mem to accessor macros. But the sockets_allocated field of sctp sock is not replaced at all. Then replace it now for unifying the code. Fixes: 180d8cd9 ("foundations of per-cgroup memory pressure controlling.") Cc: Glauber Costa <glommer@parallels.com> Signed-off-by:
Tonghao Zhang <zhangtonghao@didichuxing.com> Signed-off-by:
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Tobias Jordan authored
[ Upstream commit 589bf32f ] add appropriate calls to clk_disable_unprepare() by jumping to out_mdio in case orion_mdio_probe() returns -EPROBE_DEFER. Found by Linux Driver Verification project (linuxtesting.org). Fixes: 3d604da1 ("net: mvmdio: get and enable optional clock") Signed-off-by:
Tobias Jordan <Tobias.Jordan@elektrobit.com> Reviewed-by:
Andrew Lunn <andrew@lunn.ch> Signed-off-by:
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Mohamed Ghannam authored
[ Upstream commit 8f659a03 ] inet->hdrincl is racy, and could lead to uninitialized stack pointer usage, so its value should be read only once. Fixes: c008ba5b ("ipv4: Avoid reading user iov twice after raw_probe_proto_opt") Signed-off-by:
Mohamed Ghannam <simo.ghannam@gmail.com> Reviewed-by:
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Brian King authored
[ Upstream commit 748a240c ] This fixes a hang issue seen when changing the MTU size from 1500 MTU to 9000 MTU on both 5717 and 5719 chips. In discussion with Broadcom, they've indicated that these chipsets have the same phy as the 57766 chipset, so the same workarounds apply. This has been tested by IBM on both Power 8 and Power 9 systems as well as by Broadcom on x86 hardware and has been confirmed to resolve the hang issue. Signed-off-by:
Brian King <brking@linux.vnet.ibm.com> Signed-off-by:
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