- 27 Apr, 2017 6 commits
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Rabin Vincent authored
commit fc280fe8 upstream. Commit 6afcf8ef ("mm, compaction: fix NR_ISOLATED_* stats for pfn based migration") moved the dec_node_page_state() call (along with the page_is_file_cache() call) to after putback_lru_page(). But page_is_file_cache() can change after putback_lru_page() is called, so it should be called before putback_lru_page(), as it was before that patch, to prevent NR_ISOLATE_* stats from going negative. Without this fix, non-CONFIG_SMP kernels end up hanging in the while(too_many_isolated()) { congestion_wait() } loop in shrink_active_list() due to the negative stats. Mem-Info: active_anon:32567 inactive_anon:121 isolated_anon:1 active_file:6066 inactive_file:6639 isolated_file:4294967295 ^^^^^^^^^^ unevictable:0 dirty:115 writeback:0 unstable:0 slab_reclaimable:2086 slab_unreclaimable:3167 mapped:3398 shmem:18366 pagetables:1145 bounce:0 free:1798 free_pcp:13 free_cma:0 Fixes: 6afcf8ef ("mm, compaction: fix NR_ISOLATED_* stats for pfn based migration") Link: http://lkml.kernel.org/r/1492683865-27549-1-git-send-email-rabin.vincent@axis.comSigned-off-by:
Rabin Vincent <rabinv@axis.com> Acked-by:
Michal Hocko <mhocko@suse.com> Cc: Ming Ling <ming.ling@spreadtrum.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Steven Rostedt (VMware) authored
commit 78f7a45d upstream. I noticed that reading the snapshot file when it is empty no longer gives a status. It suppose to show the status of the snapshot buffer as well as how to allocate and use it. For example: ># cat snapshot # tracer: nop # # # * Snapshot is allocated * # # Snapshot commands: # echo 0 > snapshot : Clears and frees snapshot buffer # echo 1 > snapshot : Allocates snapshot buffer, if not already allocated. # Takes a snapshot of the main buffer. # echo 2 > snapshot : Clears snapshot buffer (but does not allocate or free) # (Doesn't have to be '2' works with any number that # is not a '0' or '1') But instead it just showed an empty buffer: ># cat snapshot # tracer: nop # # entries-in-buffer/entries-written: 0/0 #P:4 # # _-----=> irqs-off # / _----=> need-resched # | / _---=> hardirq/softirq # || / _--=> preempt-depth # ||| / delay # TASK-PID CPU# |||| TIMESTAMP FUNCTION # | | | |||| | | What happened was that it was using the ring_buffer_iter_empty() function to see if it was empty, and if it was, it showed the status. But that function was returning false when it was empty. The reason was that the iter header page was on the reader page, and the reader page was empty, but so was the buffer itself. The check only tested to see if the iter was on the commit page, but the commit page was no longer pointing to the reader page, but as all pages were empty, the buffer is also. Fixes: 651e22f2 ("ring-buffer: Always reset iterator to reader page") Signed-off-by:
Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by:
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Steven Rostedt (VMware) authored
commit df62db5b upstream. Currently the snapshot trigger enables the probe and then allocates the snapshot. If the probe triggers before the allocation, it could cause the snapshot to fail and turn tracing off. It's best to allocate the snapshot buffer first, and then enable the trigger. If something goes wrong in the enabling of the trigger, the snapshot buffer is still allocated, but it can also be freed by the user by writting zero into the snapshot buffer file. Also add a check of the return status of alloc_snapshot(). Fixes: 77fd5c15 ("tracing: Add snapshot trigger to function probes") Signed-off-by:
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Eric Biggers authored
commit c9f838d1 upstream. This fixes CVE-2017-7472. Running the following program as an unprivileged user exhausts kernel memory by leaking thread keyrings: #include <keyutils.h> int main() { for (;;) keyctl_set_reqkey_keyring(KEY_REQKEY_DEFL_THREAD_KEYRING); } Fix it by only creating a new thread keyring if there wasn't one before. To make things more consistent, make install_thread_keyring_to_cred() and install_process_keyring_to_cred() both return 0 if the corresponding keyring is already present. Fixes: d84f4f99 ("CRED: Inaugurate COW credentials") Signed-off-by:
Eric Biggers <ebiggers@google.com> Signed-off-by:
David Howells <dhowells@redhat.com> Signed-off-by:
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David Howells authored
commit c1644fe0 upstream. This fixes CVE-2017-6951. Userspace should not be able to do things with the "dead" key type as it doesn't have some of the helper functions set upon it that the kernel needs. Attempting to use it may cause the kernel to crash. Fix this by changing the name of the type to ".dead" so that it's rejected up front on userspace syscalls by key_get_type_from_user(). Though this doesn't seem to affect recent kernels, it does affect older ones, certainly those prior to: commit c06cfb08 Author: David Howells <dhowells@redhat.com> Date: Tue Sep 16 17:36:06 2014 +0100 KEYS: Remove key_type::match in favour of overriding default by match_preparse which went in before 3.18-rc1. Signed-off-by:
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David Howells authored
commit ee8f844e upstream. This fixes CVE-2016-9604. Keyrings whose name begin with a '.' are special internal keyrings and so userspace isn't allowed to create keyrings by this name to prevent shadowing. However, the patch that added the guard didn't fix KEYCTL_JOIN_SESSION_KEYRING. Not only can that create dot-named keyrings, it can also subscribe to them as a session keyring if they grant SEARCH permission to the user. This, for example, allows a root process to set .builtin_trusted_keys as its session keyring, at which point it has full access because now the possessor permissions are added. This permits root to add extra public keys, thereby bypassing module verification. This also affects kexec and IMA. This can be tested by (as root): keyctl session .builtin_trusted_keys keyctl add user a a @s keyctl list @s which on my test box gives me: 2 keys in keyring: 180010936: ---lswrv 0 0 asymmetric: Build time autogenerated kernel key: ae3d4a31b82daa8e1a75b49dc2bba949fd992a05 801382539: --alswrv 0 0 user: a Fix this by rejecting names beginning with a '.' in the keyctl. Signed-off-by:
Mimi Zohar <zohar@linux.vnet.ibm.com> cc: linux-ima-devel@lists.sourceforge.net Signed-off-by:
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- 21 Apr, 2017 34 commits
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Greg Kroah-Hartman authored
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Marcelo Ricardo Leitner authored
commit dfcb9f4f upstream. commit 2dcab598 ("sctp: avoid BUG_ON on sctp_wait_for_sndbuf") attempted to avoid a BUG_ON call when the association being used for a sendmsg() is blocked waiting for more sndbuf and another thread did a peeloff operation on such asoc, moving it to another socket. As Ben Hutchings noticed, then in such case it would return without locking back the socket and would cause two unlocks in a row. Further analysis also revealed that it could allow a double free if the application managed to peeloff the asoc that is created during the sendmsg call, because then sctp_sendmsg() would try to free the asoc that was created only for that call. This patch takes another approach. It will deny the peeloff operation if there is a thread sleeping on the asoc, so this situation doesn't exist anymore. This avoids the issues described above and also honors the syscalls that are already being handled (it can be multiple sendmsg calls). Joint work with Xin Long. Fixes: 2dcab598 ("sctp: avoid BUG_ON on sctp_wait_for_sndbuf") Cc: Alexander Popov <alex.popov@linux.com> Cc: Ben Hutchings <ben@decadent.org.uk> Signed-off-by:
Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by:
Xin Long <lucien.xin@gmail.com> Signed-off-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
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Mantas M authored
commit c2ed1880 upstream. The protocol field is checked when deleting IPv4 routes, but ignored for IPv6, which causes problems with routing daemons accidentally deleting externally set routes (observed by multiple bird6 users). This can be verified using `ip -6 route del <prefix> proto something`. Signed-off-by:
Mantas Mikulėnas <grawity@gmail.com> Signed-off-by:
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Omar Sandoval authored
commit c4baad50 upstream. put_chars() stuffs the buffer it gets into an sg, but that buffer may be on the stack. This breaks with CONFIG_VMAP_STACK=y (for me, it manifested as printks getting turned into NUL bytes). Signed-off-by:
Omar Sandoval <osandov@fb.com> Signed-off-by:
Michael S. Tsirkin <mst@redhat.com> Reviewed-by:
Amit Shah <amit.shah@redhat.com> Cc: Ben Hutchings <ben@decadent.org.uk> Cc: Brad Spengler <spender@grsecurity.net> Signed-off-by:
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Stefan Brüns authored
commit 3f190e3a upstream. Commit 17ce039b ("[media] cxusb: don't do DMA on stack") added a kmalloc'ed bounce buffer for writes, but missed to do the same for reads. As the read only happens after the write is finished, we can reuse the same buffer. As dvb_usb_generic_rw handles a read length of 0 by itself, avoid calling it using the dvb_usb_generic_read wrapper function. Signed-off-by:
Stefan Brüns <stefan.bruens@rwth-aachen.de> Signed-off-by:
Mauro Carvalho Chehab <mchehab@s-opensource.com> Cc: Ben Hutchings <ben@decadent.org.uk> Cc: Brad Spengler <spender@grsecurity.net> Signed-off-by:
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Stefan Brüns authored
commit 67b0503d upstream. The buffer allocation for the firmware data was changed in commit 43fab979 ("[media] dvb-usb: don't use stack for firmware load") but the same applies for the reset value. Fixes: 43fab979 ("[media] dvb-usb: don't use stack for firmware load") Signed-off-by:
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Mauro Carvalho Chehab authored
commit 43fab979 upstream. As reported by Marc Duponcheel <marc@offline.be>, firmware load on dvb-usb is using the stack, with is not allowed anymore on default Kernel configurations: [ 1025.958836] dvb-usb: found a 'WideView WT-220U PenType Receiver (based on ZL353)' in cold state, will try to load a firmware [ 1025.958853] dvb-usb: downloading firmware from file 'dvb-usb-wt220u-zl0353-01.fw' [ 1025.958855] dvb-usb: could not stop the USB controller CPU. [ 1025.958856] dvb-usb: error while transferring firmware (transferred size: -11, block size: 3) [ 1025.958856] dvb-usb: firmware download failed at 8 with -22 [ 1025.958867] usbcore: registered new interface driver dvb_usb_dtt200u [ 2.789902] dvb-usb: downloading firmware from file 'dvb-usb-wt220u-zl0353-01.fw' [ 2.789905] ------------[ cut here ]------------ [ 2.789911] WARNING: CPU: 3 PID: 2196 at drivers/usb/core/hcd.c:1584 usb_hcd_map_urb_for_dma+0x430/0x560 [usbcore] [ 2.789912] transfer buffer not dma capable [ 2.789912] Modules linked in: btusb dvb_usb_dtt200u(+) dvb_usb_af9035(+) btrtl btbcm dvb_usb dvb_usb_v2 btintel dvb_core bluetooth rc_core rfkill x86_pkg_temp_thermal intel_powerclamp coretemp crc32_pclmul aesni_intel aes_x86_64 glue_helper lrw gf128mul ablk_helper cryptd drm_kms_helper syscopyarea sysfillrect pcspkr i2c_i801 sysimgblt fb_sys_fops drm i2c_smbus i2c_core r8169 lpc_ich mfd_core mii thermal fan rtc_cmos video button acpi_cpufreq processor snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hwdep snd_hda_core snd_pcm snd_timer snd crc32c_intel ahci libahci libata xhci_pci ehci_pci xhci_hcd ehci_hcd usbcore usb_common dm_mirror dm_region_hash dm_log dm_mod [ 2.789936] CPU: 3 PID: 2196 Comm: systemd-udevd Not tainted 4.9.0-gentoo #1 [ 2.789937] Hardware name: ASUS All Series/H81I-PLUS, BIOS 0401 07/23/2013 [ 2.789938] ffffc9000339b690 ffffffff812bd397 ffffc9000339b6e0 0000000000000000 [ 2.789939] ffffc9000339b6d0 ffffffff81055c86 000006300339b6a0 ffff880116c0c000 [ 2.789941] 0000000000000000 0000000000000000 0000000000000001 ffff880116c08000 [ 2.789942] Call Trace: [ 2.789945] [<ffffffff812bd397>] dump_stack+0x4d/0x66 [ 2.789947] [<ffffffff81055c86>] __warn+0xc6/0xe0 [ 2.789948] [<ffffffff81055cea>] warn_slowpath_fmt+0x4a/0x50 [ 2.789952] [<ffffffffa006d460>] usb_hcd_map_urb_for_dma+0x430/0x560 [usbcore] [ 2.789954] [<ffffffff814ed5a8>] ? io_schedule_timeout+0xd8/0x110 [ 2.789956] [<ffffffffa006e09c>] usb_hcd_submit_urb+0x9c/0x980 [usbcore] [ 2.789958] [<ffffffff812d0ebf>] ? copy_page_to_iter+0x14f/0x2b0 [ 2.789960] [<ffffffff81126818>] ? pagecache_get_page+0x28/0x240 [ 2.789962] [<ffffffff8118c2a0>] ? touch_atime+0x20/0xa0 [ 2.789964] [<ffffffffa006f7c4>] usb_submit_urb+0x2c4/0x520 [usbcore] [ 2.789967] [<ffffffffa006feca>] usb_start_wait_urb+0x5a/0xe0 [usbcore] [ 2.789969] [<ffffffffa007000c>] usb_control_msg+0xbc/0xf0 [usbcore] [ 2.789970] [<ffffffffa067903d>] usb_cypress_writemem+0x3d/0x40 [dvb_usb] [ 2.789972] [<ffffffffa06791cf>] usb_cypress_load_firmware+0x4f/0x130 [dvb_usb] [ 2.789973] [<ffffffff8109dbbe>] ? console_unlock+0x2fe/0x5d0 [ 2.789974] [<ffffffff8109e10c>] ? vprintk_emit+0x27c/0x410 [ 2.789975] [<ffffffff8109e40a>] ? vprintk_default+0x1a/0x20 [ 2.789976] [<ffffffff81124d76>] ? printk+0x43/0x4b [ 2.789977] [<ffffffffa0679310>] dvb_usb_download_firmware+0x60/0xd0 [dvb_usb] [ 2.789979] [<ffffffffa0679898>] dvb_usb_device_init+0x3d8/0x610 [dvb_usb] [ 2.789981] [<ffffffffa069e302>] dtt200u_usb_probe+0x92/0xd0 [dvb_usb_dtt200u] [ 2.789984] [<ffffffffa007420c>] usb_probe_interface+0xfc/0x270 [usbcore] [ 2.789985] [<ffffffff8138bf95>] driver_probe_device+0x215/0x2d0 [ 2.789986] [<ffffffff8138c0e6>] __driver_attach+0x96/0xa0 [ 2.789987] [<ffffffff8138c050>] ? driver_probe_device+0x2d0/0x2d0 [ 2.789988] [<ffffffff81389ffb>] bus_for_each_dev+0x5b/0x90 [ 2.789989] [<ffffffff8138b7b9>] driver_attach+0x19/0x20 [ 2.789990] [<ffffffff8138b33c>] bus_add_driver+0x11c/0x220 [ 2.789991] [<ffffffff8138c91b>] driver_register+0x5b/0xd0 [ 2.789994] [<ffffffffa0072f6c>] usb_register_driver+0x7c/0x130 [usbcore] [ 2.789994] [<ffffffffa06a5000>] ? 0xffffffffa06a5000 [ 2.789996] [<ffffffffa06a501e>] dtt200u_usb_driver_init+0x1e/0x20 [dvb_usb_dtt200u] [ 2.789997] [<ffffffff81000408>] do_one_initcall+0x38/0x140 [ 2.789998] [<ffffffff8116001c>] ? __vunmap+0x7c/0xc0 [ 2.789999] [<ffffffff81124fb0>] ? do_init_module+0x22/0x1d2 [ 2.790000] [<ffffffff81124fe8>] do_init_module+0x5a/0x1d2 [ 2.790002] [<ffffffff810c96b1>] load_module+0x1e11/0x2580 [ 2.790003] [<ffffffff810c68b0>] ? show_taint+0x30/0x30 [ 2.790004] [<ffffffff81177250>] ? kernel_read_file+0x100/0x190 [ 2.790005] [<ffffffff810c9ffa>] SyS_finit_module+0xba/0xc0 [ 2.790007] [<ffffffff814f13e0>] entry_SYSCALL_64_fastpath+0x13/0x94 [ 2.790008] ---[ end trace c78a74e78baec6fc ]--- So, allocate the structure dynamically. Signed-off-by:
Ben Hutchings <ben@decadent.org.uk> Signed-off-by:
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Kees Cook authored
commit a4866aa8 upstream. Under CONFIG_STRICT_DEVMEM, reading System RAM through /dev/mem is disallowed. However, on x86, the first 1MB was always allowed for BIOS and similar things, regardless of it actually being System RAM. It was possible for heap to end up getting allocated in low 1MB RAM, and then read by things like x86info or dd, which would trip hardened usercopy: usercopy: kernel memory exposure attempt detected from ffff880000090000 (dma-kmalloc-256) (4096 bytes) This changes the x86 exception for the low 1MB by reading back zeros for System RAM areas instead of blindly allowing them. More work is needed to extend this to mmap, but currently mmap doesn't go through usercopy, so hardened usercopy won't Oops the kernel. Reported-by:
Tommi Rantala <tommi.t.rantala@nokia.com> Tested-by:
Kees Cook <keescook@chromium.org> Cc: Brad Spengler <spender@grsecurity.net> Signed-off-by:
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Thierry Reding authored
commit 5fa40869 upstream. Accessing the registers of the RTC block on Tegra requires the module clock to be enabled. This only works because the RTC module clock will be enabled by default during early boot. However, because the clock is unused, the CCF will disable it at late_init time. This causes the RTC to become unusable afterwards. This can easily be reproduced by trying to use the RTC: $ hwclock --rtc /dev/rtc1 This will hang the system. I ran into this by following up on a report by Martin Michlmayr that reboot wasn't working on Tegra210 systems. It turns out that the rtc-tegra driver's ->shutdown() implementation will hang the CPU, because of the disabled clock, before the system can be rebooted. What confused me for a while is that the same driver is used on prior Tegra generations where the hang can not be observed. However, as Peter De Schrijver pointed out, this is because on 32-bit Tegra chips the RTC clock is enabled by the tegra20_timer.c clocksource driver, which uses the RTC to provide a persistent clock. This code is never enabled on 64-bit Tegra because the persistent clock infrastructure does not exist on 64-bit ARM. The proper fix for this is to add proper clock handling to the RTC driver in order to ensure that the clock is enabled when the driver requires it. All device trees contain the clock already, therefore no additional changes are required. Reported-by:
Martin Michlmayr <tbm@cyrius.com> Acked-By Peter De Schrijver <pdeschrijver@nvidia.com> Signed-off-by:
Thierry Reding <treding@nvidia.com> Signed-off-by:
Alexandre Belloni <alexandre.belloni@free-electrons.com> [bwh: Backported to 4.9: adjust context] Signed-off-by:
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Lv Zheng authored
commit c3a696b6 upstream. When GPE is not enabled, it is not efficient to use the wait polling mode as it introduces an unexpected scheduler delay. So before the GPE handler is installed, this patch uses busy polling mode for all EC(s) and the logic can be applied to non boot EC(s) during the suspend/resume process. Link: https://bugzilla.kernel.org/show_bug.cgi?id=191561Tested-by:
Jakobus Schurz <jakobus.schurz@gmail.com> Tested-by:
Chen Yu <yu.c.chen@intel.com> Signed-off-by:
Lv Zheng <lv.zheng@intel.com> Signed-off-by:
Rafael J. Wysocki <rafael.j.wysocki@intel.com> Cc: Ben Hutchings <ben@decadent.org.uk> Signed-off-by:
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Mohit Gambhir authored
commit cc272163 upstream. This patch fixes the following warning message seen when booting the kernel as Dom0 with Xen on Intel machines. [0.003000] [Firmware Bug]: CPU1: APIC id mismatch. Firmware: 0 APIC: 1] The code generating the warning in validate_apic_and_package_id() matches cpu_data(cpu).apicid (initialized in init_intel()-> detect_extended_topology() using cpuid) against the apicid returned from xen_apic_read(). Now, xen_apic_read() makes a hypercall to retrieve apicid for the boot cpu but returns 0 otherwise. Hence the warning gets thrown for all but the boot cpu. The idea behind xen_apic_read() returning 0 for apicid is that the guests (even Dom0) should not need to know what physical processor their vcpus are running on. This is because we currently do not have topology information in Xen and also because xen allows more vcpus than physical processors. However, boot cpu's apicid is required for loading xen-acpi-processor driver on AMD machines. Look at following patch for details: commit 558daa28 ("xen/apic: Return the APIC ID (and version) for CPU 0.") So to get rid of the warning, this patch modifies xen_cpu_present_to_apicid() to return cpu_data(cpu).apicid instead of calling xen_apic_read(). The warning is not seen on AMD machines because init_amd() populates cpu_data(cpu).apicid by calling hard_smp_processor_id()->xen_apic_read() as opposed to using apicid from cpuid as is done on Intel machines. Signed-off-by:
Mohit Gambhir <mohit.gambhir@oracle.com> Reviewed-by:
Juergen Gross <jgross@suse.com> Signed-off-by:
Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Ben Hutchings <ben@decadent.org.uk> Signed-off-by:
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Lee, Chun-Yi authored
commit 98d610c3 upstream. The accelerometer event relies on the ACERWMID_EVENT_GUID notify. So, this patch changes the codes to setup accelerometer input device when detected ACERWMID_EVENT_GUID. It avoids that the accel input device created on every Acer machines. In addition, patch adds a clearly parsing logic of accelerometer hid to acer_wmi_get_handle_cb callback function. It is positive matching the "SENR" name with "BST0001" device to avoid non-supported hardware. Reported-by:
Bjørn Mork <bjorn@mork.no> Cc: Darren Hart <dvhart@infradead.org> Signed-off-by:
Lee, Chun-Yi <jlee@suse.com> [andy: slightly massage commit message] Signed-off-by:
Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Ben Hutchings <ben@decadent.org.uk> Signed-off-by:
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Andy Shevchenko authored
commit ebf79091 upstream. Select DW_DMAC_CORE like the rest of glue drivers do, e.g. drivers/dma/dw/Kconfig. While here group selectors under SND_SOC_INTEL_HASWELL and SND_SOC_INTEL_BAYTRAIL. Make platforms, which are using a common SST firmware driver, to be dependent on DMADEVICES. Signed-off-by:
Liam Girdwood <liam.r.girdwood@linux.intel.com> Signed-off-by:
Mark Brown <broonie@kernel.org> Cc: Ben Hutchings <ben@decadent.org.uk> Signed-off-by:
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Jens Axboe authored
commit e88f72cb upstream. We have this: ERROR: "__aeabi_ldivmod" [drivers/block/nbd.ko] undefined! ERROR: "__divdi3" [drivers/block/nbd.ko] undefined! nbd.c:(.text+0x247c72): undefined reference to `__divdi3' due to a recent commit, that did 64-bit division. Use the proper divider function so that 32-bit compiles don't break. Fixes: ef77b515 ("nbd: use loff_t for blocksize and nbd_set_size args") Signed-off-by:
Jens Axboe <axboe@fb.com> Cc: Ben Hutchings <ben@decadent.org.uk> Signed-off-by:
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Josef Bacik authored
commit ef77b515 upstream. If we have large devices (say like the 40t drive I was trying to test with) we will end up overflowing the int arguments to nbd_set_size and not get the right size for our device. Fix this by using loff_t everywhere so I don't have to think about this again. Thanks, Signed-off-by:
Josef Bacik <jbacik@fb.com> Signed-off-by:
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Ben Skeggs authored
commit 7dfee682 upstream. The workaround appears to cause regressions on these boards, and from inspection of RM traces, NVIDIA don't appear to do it on them either. Signed-off-by:
Ben Skeggs <bskeggs@redhat.com> Tested-by:
Roy Spliet <nouveau@spliet.org> Cc: Ben Hutchings <ben@decadent.org.uk> Signed-off-by:
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Vladimir Davydov authored
commit 13583c3d upstream. Creating a lot of cgroups at the same time might stall all worker threads with kmem cache creation works, because kmem cache creation is done with the slab_mutex held. The problem was amplified by commits 801faf0d ("mm/slab: lockless decision to grow cache") in case of SLAB and 81ae6d03 ("mm/slub.c: replace kick_all_cpus_sync() with synchronize_sched() in kmem_cache_shrink()") in case of SLUB, which increased the maximal time the slab_mutex can be held. To prevent that from happening, let's use a special ordered single threaded workqueue for kmem cache creation. This shouldn't introduce any functional changes regarding how kmem caches are created, as the work function holds the global slab_mutex during its whole runtime anyway, making it impossible to run more than one work at a time. By using a single threaded workqueue, we just avoid creating a thread per each work. Ordering is required to avoid a situation when a cgroup's work is put off indefinitely because there are other cgroups to serve, in other words to guarantee fairness. Link: https://bugzilla.kernel.org/show_bug.cgi?id=172981 Link: http://lkml.kernel.org/r/20161004131417.GC1862@esperanzaSigned-off-by:
Vladimir Davydov <vdavydov.dev@gmail.com> Reported-by:
Doug Smythies <dsmythies@telus.net> Acked-by:
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Daeho Jeong authored
commit 05ac5aa1 upstream. We've fixed the race condition problem in calculating ext4 checksum value in commit b47820ed ("ext4: avoid modifying checksum fields directly during checksum veficationon"). However, by this change, when calculating the checksum value of inode whose i_extra_size is less than 4, we couldn't calculate the checksum value in a proper way. This problem was found and reported by Nix, Thank you. Reported-by:
Nix <nix@esperi.org.uk> Signed-off-by:
Daeho Jeong <daeho.jeong@samsung.com> Signed-off-by:
Youngjin Gil <youngjin.gil@samsung.com> Signed-off-by:
Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by:
Theodore Ts'o <tytso@mit.edu> Signed-off-by:
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Arnd Bergmann authored
commit 00514537 upstream. I ran into a stack frame size warning because of the on-stack copy of the USB device structure: drivers/media/usb/dvb-usb-v2/dvb_usb_core.c: In function 'dvb_usbv2_disconnect': drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:1029:1: error: the frame size of 1104 bytes is larger than 1024 bytes [-Werror=frame-larger-than=] Copying a device structure like this is wrong for a number of other reasons too aside from the possible stack overflow. One of them is that the dev_info() call will print the name of the device later, but AFAICT we have only copied a pointer to the name earlier and the actual name has been freed by the time it gets printed. This removes the on-stack copy of the device and instead copies the device name using kstrdup(). I'm ignoring the possible failure here as both printk() and kfree() are able to deal with NULL pointers. Signed-off-by:
Arnd Bergmann <arnd@arndb.de> Signed-off-by:
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Miaoqing Pan authored
commit 40bea976 upstream. relay_open() may return NULL, check the return value to avoid the crash. BUG: unable to handle kernel NULL pointer dereference at 0000000000000040 IP: [<ffffffffa01a95c5>] ath_cmn_process_fft+0xd5/0x700 [ath9k_common] PGD 41cf28067 PUD 41be92067 PMD 0 Oops: 0000 [#1] SMP CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.8.6+ #35 Hardware name: Hewlett-Packard h8-1080t/2A86, BIOS 6.15 07/04/2011 task: ffffffff81e0c4c0 task.stack: ffffffff81e00000 RIP: 0010:[<ffffffffa01a95c5>] [<ffffffffa01a95c5>] ath_cmn_process_fft+0xd5/0x700 [ath9k_common] RSP: 0018:ffff88041f203ca0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 000000000000059f RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000040 RDI: ffffffff81f0ca98 RBP: ffff88041f203dc8 R08: ffffffffffffffff R09: 00000000000000ff R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff81f0ca98 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88041f200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000040 CR3: 000000041b6ec000 CR4: 00000000000006f0 Stack: 0000000000000363 00000000000003f3 00000000000003f3 00000000000001f9 000000000000049a 0000000001252c04 ffff88041f203e44 ffff880417b4bfd0 0000000000000008 ffff88041785b9c0 0000000000000002 ffff88041613dc60 Call Trace: <IRQ> [<ffffffffa01b6441>] ath9k_tasklet+0x1b1/0x220 [ath9k] [<ffffffff8105d8dd>] tasklet_action+0x4d/0xf0 [<ffffffff8105dde2>] __do_softirq+0x92/0x2a0 Reported-by:
Devin Tuchsen <devin.tuchsen@gmail.com> Tested-by:
Miaoqing Pan <miaoqing@codeaurora.org> Signed-off-by:
Kalle Valo <kvalo@qca.qualcomm.com> Signed-off-by:
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Helge Deller authored
commit 3f795cef upstream. This fixes a bug in which the upper 32-bits of a 64-bit value which is read by get_user() was lost on a 32-bit kernel. While touching this code, split out pre-loading of %sr2 space register and clean up code indent. Signed-off-by:
Helge Deller <deller@gmx.de> Signed-off-by:
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Herbert Xu authored
commit ef0579b6 upstream. The ahash API modifies the request's callback function in order to clean up after itself in some corner cases (unaligned final and missing finup). When the request is complete ahash will restore the original callback and everything is fine. However, when the request gets an EBUSY on a full queue, an EINPROGRESS callback is made while the request is still ongoing. In this case the ahash API will incorrectly call its own callback. This patch fixes the problem by creating a temporary request object on the stack which is used to relay EINPROGRESS back to the original completion function. This patch also adds code to preserve the original flags value. Fixes: ab6bf4e5 ("crypto: hash - Fix the pointer voodoo in...") Reported-by:
Sabrina Dubroca <sd@queasysnail.net> Tested-by:
Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by:
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Herbert Xu authored
commit e6534aeb upstream. The algif_aead completion function tries to deduce the aead_request from the crypto_async_request argument. This is broken because the API does not guarantee that the same request will be pased to the completion function. Only the value of req->data can be used in the completion function. This patch fixes it by storing a pointer to sk in areq and using that instead of passing in sk through req->data. Fixes: 83094e5e ("crypto: af_alg - add async support to...") Signed-off-by:
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Namhyung Kim authored
commit d879d0b8 upstream. When function tracer has a pid filter, it adds a probe to sched_switch to track if current task can be ignored. The probe checks the ftrace_ignore_pid from current tr to filter tasks. But it misses to delete the probe when removing an instance so that it can cause a crash due to the invalid tr pointer (use-after-free). This is easily reproducible with the following: # cd /sys/kernel/debug/tracing # mkdir instances/buggy # echo $$ > instances/buggy/set_ftrace_pid # rmdir instances/buggy ============================================================================ BUG: KASAN: use-after-free in ftrace_filter_pid_sched_switch_probe+0x3d/0x90 Read of size 8 by task kworker/0:1/17 CPU: 0 PID: 17 Comm: kworker/0:1 Tainted: G B 4.11.0-rc3 #198 Call Trace: dump_stack+0x68/0x9f kasan_object_err+0x21/0x70 kasan_report.part.1+0x22b/0x500 ? ftrace_filter_pid_sched_switch_probe+0x3d/0x90 kasan_report+0x25/0x30 __asan_load8+0x5e/0x70 ftrace_filter_pid_sched_switch_probe+0x3d/0x90 ? fpid_start+0x130/0x130 __schedule+0x571/0xce0 ... To fix it, use ftrace_clear_pids() to unregister the probe. As instance_rmdir() already updated ftrace codes, it can just free the filter safely. Link: http://lkml.kernel.org/r/20170417024430.21194-2-namhyung@kernel.org Fixes: 0c8916c3 ("tracing: Add rmdir to remove multibuffer instances") Cc: Ingo Molnar <mingo@kernel.org> Reviewed-by:
Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by:
Namhyung Kim <namhyung@kernel.org> Signed-off-by:
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Minchan Kim authored
commit d72e9a7a upstream. The copy_page is optimized memcpy for page-alinged address. If it is used with non-page aligned address, it can corrupt memory which means system corruption. With zram, it can happen with 1. 64K architecture 2. partial IO 3. slub debug Partial IO need to allocate a page and zram allocates it via kmalloc. With slub debug, kmalloc(PAGE_SIZE) doesn't return page-size aligned address. And finally, copy_page(mem, cmem) corrupts memory. So, this patch changes it to memcpy. Actuaully, we don't need to change zram_bvec_write part because zsmalloc returns page-aligned address in case of PAGE_SIZE class but it's not good to rely on the internal of zsmalloc. Note: When this patch is merged to stable, clear_page should be fixed, too. Unfortunately, recent zram removes it by "same page merge" feature so it's hard to backport this patch to -stable tree. I will handle it when I receive the mail from stable tree maintainer to merge this patch to backport. Fixes: 42e99bd9 ("zram: optimize memory operations with clear_page()/copy_page()") Link: http://lkml.kernel.org/r/1492042622-12074-2-git-send-email-minchan@kernel.orgSigned-off-by:
Minchan Kim <minchan@kernel.org> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Signed-off-by:
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Paolo Bonzini authored
commit 06ce521a upstream. handle_vmon gets a reference on VMXON region page, but does not release it. Release the reference. Found by syzkaller; based on a patch by Dmitry. Reported-by:
Dmitry Vyukov <dvyukov@google.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com> [bwh: Backported to 3.16: use skip_emulated_instruction()] Signed-off-by:
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Greg Kroah-Hartman authored
This reverts commit 362721c4 which is commit 6c356eda upstream. It shouldn't have been included in a stable release. Reported-by:
Amit Pundir <amit.pundir@linaro.org> Cc: Felix Fietkau <nbd@nbd.name> Cc: John Crispin <john@phrozen.org> Cc: James Hogan <james.hogan@imgtec.com> Signed-off-by:
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Max Bires authored
commit f2cfa58b upstream. Without a bool string present, using "# CONFIG_DEVPORT is not set" in defconfig files would not actually unset devport. This esnured that /dev/port was always on, but there are reasons a user may wish to disable it (smaller kernel, attack surface reduction) if it's not being used. Adding a message here in order to make this user visible. Signed-off-by:
Max Bires <jbires@google.com> Acked-by:
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Steven Rostedt (VMware) authored
commit 82cc4fc2 upstream. When two function probes are added to set_ftrace_filter, and then one of them is removed, the update to the function locations is not performed, and the record keeping of the function states are corrupted, and causes an ftrace_bug() to occur. This is easily reproducable by adding two probes, removing one, and then adding it back again. # cd /sys/kernel/debug/tracing # echo schedule:traceoff > set_ftrace_filter # echo do_IRQ:traceoff > set_ftrace_filter # echo \!do_IRQ:traceoff > /debug/tracing/set_ftrace_filter # echo do_IRQ:traceoff > set_ftrace_filter Causes: ------------[ cut here ]------------ WARNING: CPU: 2 PID: 1098 at kernel/trace/ftrace.c:2369 ftrace_get_addr_curr+0x143/0x220 Modules linked in: [...] CPU: 2 PID: 1098 Comm: bash Not tainted 4.10.0-test+ #405 Hardware name: Hewlett-Packard HP Compaq Pro 6300 SFF/339A, BIOS K01 v02.05 05/07/2012 Call Trace: dump_stack+0x68/0x9f __warn+0x111/0x130 ? trace_irq_work_interrupt+0xa0/0xa0 warn_slowpath_null+0x1d/0x20 ftrace_get_addr_curr+0x143/0x220 ? __fentry__+0x10/0x10 ftrace_replace_code+0xe3/0x4f0 ? ftrace_int3_handler+0x90/0x90 ? printk+0x99/0xb5 ? 0xffffffff81000000 ftrace_modify_all_code+0x97/0x110 arch_ftrace_update_code+0x10/0x20 ftrace_run_update_code+0x1c/0x60 ftrace_run_modify_code.isra.48.constprop.62+0x8e/0xd0 register_ftrace_function_probe+0x4b6/0x590 ? ftrace_startup+0x310/0x310 ? debug_lockdep_rcu_enabled.part.4+0x1a/0x30 ? update_stack_state+0x88/0x110 ? ftrace_regex_write.isra.43.part.44+0x1d3/0x320 ? preempt_count_sub+0x18/0xd0 ? mutex_lock_nested+0x104/0x800 ? ftrace_regex_write.isra.43.part.44+0x1d3/0x320 ? __unwind_start+0x1c0/0x1c0 ? _mutex_lock_nest_lock+0x800/0x800 ftrace_trace_probe_callback.isra.3+0xc0/0x130 ? func_set_flag+0xe0/0xe0 ? __lock_acquire+0x642/0x1790 ? __might_fault+0x1e/0x20 ? trace_get_user+0x398/0x470 ? strcmp+0x35/0x60 ftrace_trace_onoff_callback+0x48/0x70 ftrace_regex_write.isra.43.part.44+0x251/0x320 ? match_records+0x420/0x420 ftrace_filter_write+0x2b/0x30 __vfs_write+0xd7/0x330 ? do_loop_readv_writev+0x120/0x120 ? locks_remove_posix+0x90/0x2f0 ? do_lock_file_wait+0x160/0x160 ? __lock_is_held+0x93/0x100 ? rcu_read_lock_sched_held+0x5c/0xb0 ? preempt_count_sub+0x18/0xd0 ? __sb_start_write+0x10a/0x230 ? vfs_write+0x222/0x240 vfs_write+0xef/0x240 SyS_write+0xab/0x130 ? SyS_read+0x130/0x130 ? trace_hardirqs_on_caller+0x182/0x280 ? trace_hardirqs_on_thunk+0x1a/0x1c entry_SYSCALL_64_fastpath+0x18/0xad RIP: 0033:0x7fe61c157c30 RSP: 002b:00007ffe87890258 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: ffffffff8114a410 RCX: 00007fe61c157c30 RDX: 0000000000000010 RSI: 000055814798f5e0 RDI: 0000000000000001 RBP: ffff8800c9027f98 R08: 00007fe61c422740 R09: 00007fe61ca53700 R10: 0000000000000073 R11: 0000000000000246 R12: 0000558147a36400 R13: 00007ffe8788f160 R14: 0000000000000024 R15: 00007ffe8788f15c ? trace_hardirqs_off_caller+0xc0/0x110 ---[ end trace 99fa09b3d9869c2c ]--- Bad trampoline accounting at: ffffffff81cc3b00 (do_IRQ+0x0/0x150) Fixes: 59df055f ("ftrace: trace different functions with a different tracer") Signed-off-by:
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Tyler Baker authored
commit 75eb5e1e upstream. The raw_spinlock in the IMX GPCV2 interupt chip is not initialized before usage. That results in a lockdep splat: INFO: trying to register non-static key. the code is fine but needs lockdep annotation. turning off the locking correctness validator. Add the missing raw_spin_lock_init() to the setup code. Fixes: e324c4dc ("irqchip/imx-gpcv2: IMX GPCv2 driver for wakeup sources") Signed-off-by:
Tyler Baker <tyler.baker@linaro.org> Reviewed-by:
Fabio Estevam <fabio.estevam@nxp.com> Cc: jason@lakedaemon.net Cc: marc.zyngier@arm.com Cc: shawnguo@kernel.org Cc: andrew.smirnov@gmail.com Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/20170413222731.5917-1-tyler.baker@linaro.orgSigned-off-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
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Chen Yu authored
commit c4a3fa26 upstream. There is a report that after commit 27622b06 ("cpufreq: Convert to hotplug state machine"), the normal CPU offline/online cycle fails on some platforms. According to the ftrace result, this problem was triggered on platforms using acpi-cpufreq as the default cpufreq driver, and due to the lack of some ACPI freq method (eg. _PCT), cpufreq_online() failed and returned a negative value, so the CPU hotplug state machine rolled back the CPU online process. Actually, from the user's perspective, the failure of cpufreq_online() should not prevent that CPU from being brought up, although cpufreq might not work on that CPU. BTW, during system startup cpufreq_online() is not invoked via CPU online but by the cpufreq device creation process, so the APs can be brought up even though cpufreq_online() fails in that stage. This patch ignores the return value of cpufreq_online/offline() and lets the cpufreq framework deal with the failure. cpufreq_online() itself will do a proper rollback in that case and if _PCT is missing, the ACPI cpufreq driver will print a warning if the corresponding debug options have been enabled. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=194581 Fixes: 27622b06 ("cpufreq: Convert to hotplug state machine") Reported-and-tested-by:
Tomasz Maciej Nowak <tmn505@gmail.com> Signed-off-by:
Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by:
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David Wu authored
commit a900152b upstream. If the PWM was not enabled at U-Boot loader, PWM could not work for clock always disabled at PWM driver. The PWM clock is enabled at beginning of pwm_apply(), but disabled at end of pwm_apply(). If the PWM was enabled at U-Boot loader, PWM clock is always enabled unless closed by ATF. The pwm-backlight might turn off the power at early suspend, should disable PWM clock for saving power consume. It is important to provide opportunity to enable/disable clock at PWM driver, the PWM consumer should ensure correct order to call PWM enable and disable, and PWM driver ensure state of PWM clock synchronized with PWM enabled state. Fixes: 2bf1c98a ("pwm: rockchip: Add support for atomic update") Signed-off-by:
David Wu <david.wu@rock-chips.com> Reviewed-by:
Boris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by:
Thierry Reding <thierry.reding@gmail.com> Signed-off-by:
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Markus Marb authored
commit 57c1d4c3 upstream. The incorrect offset was used when trying to read the RXSTCMD register. Signed-off-by:
Markus Marb <markus@marb.org> Signed-off-by:
Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by:
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Dan Williams authored
commit 0beb2012 upstream. Holding the reconfig_mutex over a potential userspace fault sets up a lockdep dependency chain between filesystem-DAX and the libnvdimm ioctl path. Move the user access outside of the lock. [ INFO: possible circular locking dependency detected ] 4.11.0-rc3+ #13 Tainted: G W O ------------------------------------------------------- fallocate/16656 is trying to acquire lock: (&nvdimm_bus->reconfig_mutex){+.+.+.}, at: [<ffffffffa00080b1>] nvdimm_bus_lock+0x21/0x30 [libnvdimm] but task is already holding lock: (jbd2_handle){++++..}, at: [<ffffffff813b4944>] start_this_handle+0x104/0x460 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (jbd2_handle){++++..}: lock_acquire+0xbd/0x200 start_this_handle+0x16a/0x460 jbd2__journal_start+0xe9/0x2d0 __ext4_journal_start_sb+0x89/0x1c0 ext4_dirty_inode+0x32/0x70 __mark_inode_dirty+0x235/0x670 generic_update_time+0x87/0xd0 touch_atime+0xa9/0xd0 ext4_file_mmap+0x90/0xb0 mmap_region+0x370/0x5b0 do_mmap+0x415/0x4f0 vm_mmap_pgoff+0xd7/0x120 SyS_mmap_pgoff+0x1c5/0x290 SyS_mmap+0x22/0x30 entry_SYSCALL_64_fastpath+0x1f/0xc2 -> #1 (&mm->mmap_sem){++++++}: lock_acquire+0xbd/0x200 __might_fault+0x70/0xa0 __nd_ioctl+0x683/0x720 [libnvdimm] nvdimm_ioctl+0x8b/0xe0 [libnvdimm] do_vfs_ioctl+0xa8/0x740 SyS_ioctl+0x79/0x90 do_syscall_64+0x6c/0x200 return_from_SYSCALL_64+0x0/0x7a -> #0 (&nvdimm_bus->reconfig_mutex){+.+.+.}: __lock_acquire+0x16b6/0x1730 lock_acquire+0xbd/0x200 __mutex_lock+0x88/0x9b0 mutex_lock_nested+0x1b/0x20 nvdimm_bus_lock+0x21/0x30 [libnvdimm] nvdimm_forget_poison+0x25/0x50 [libnvdimm] nvdimm_clear_poison+0x106/0x140 [libnvdimm] pmem_do_bvec+0x1c2/0x2b0 [nd_pmem] pmem_make_request+0xf9/0x270 [nd_pmem] generic_make_request+0x118/0x3b0 submit_bio+0x75/0x150 Fixes: 62232e45 ("libnvdimm: control (ioctl) messages for nvdimm_bus and nvdimm devices") Cc: Dave Jiang <dave.jiang@intel.com> Reported-by:
Vishal Verma <vishal.l.verma@intel.com> Signed-off-by:
Dan Williams <dan.j.williams@intel.com> Signed-off-by:
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