- 09 May, 2017 40 commits
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Jiri Slaby authored
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Josh Poimboeuf authored
commit 34a477e5 upstream. On x86-32, with CONFIG_FIRMWARE and multiple CPUs, if you enable function graph tracing and then suspend to RAM, it will triple fault and reboot when it resumes. The first fault happens when booting a secondary CPU: startup_32_smp() load_ucode_ap() prepare_ftrace_return() ftrace_graph_is_dead() (accesses 'kill_ftrace_graph') The early head_32.S code calls into load_ucode_ap(), which has an an ftrace hook, so it calls prepare_ftrace_return(), which calls ftrace_graph_is_dead(), which tries to access the global 'kill_ftrace_graph' variable with a virtual address, causing a fault because the CPU is still in real mode. The fix is to add a check in prepare_ftrace_return() to make sure it's running in protected mode before continuing. The check makes sure the stack pointer is a virtual kernel address. It's a bit of a hack, but it's not very intrusive and it works well enough. For reference, here are a few other (more difficult) ways this could have potentially been fixed: - Move startup_32_smp()'s call to load_ucode_ap() down to *after* paging is enabled. (No idea what that would break.) - Track down load_ucode_ap()'s entire callee tree and mark all the functions 'notrace'. (Probably not realistic.) - Pause graph tracing in ftrace_suspend_notifier_call() or bringup_cpu() or __cpu_up(), and ensure that the pause facility can be queried from real mode. Reported-by:
Paul Menzel <pmenzel@molgen.mpg.de> Signed-off-by:
Josh Poimboeuf <jpoimboe@redhat.com> Tested-by:
Steven Rostedt (VMware) <rostedt@goodmis.org> Cc: "Rafael J . Wysocki" <rjw@rjwysocki.net> Cc: linux-acpi@vger.kernel.org Cc: Borislav Petkov <bp@alien8.de> Cc: Len Brown <lenb@kernel.org> Link: http://lkml.kernel.org/r/5c1272269a580660703ed2eccf44308e790c7a98.1492123841.git.jpoimboe@redhat.comSigned-off-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
Jiri Slaby <jslaby@suse.cz>
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J. Bruce Fields authored
commit e6838a29 upstream. A client can append random data to the end of an NFSv2 or NFSv3 RPC call without our complaining; we'll just stop parsing at the end of the expected data and ignore the rest. Encoded arguments and replies are stored together in an array of pages, and if a call is too large it could leave inadequate space for the reply. This is normally OK because NFS RPC's typically have either short arguments and long replies (like READ) or long arguments and short replies (like WRITE). But a client that sends an incorrectly long reply can violate those assumptions. This was observed to cause crashes. Also, several operations increment rq_next_page in the decode routine before checking the argument size, which can leave rq_next_page pointing well past the end of the page array, causing trouble later in svc_free_pages. So, following a suggestion from Neil Brown, add a central check to enforce our expectation that no NFSv2/v3 call has both a large call and a large reply. As followup we may also want to rewrite the encoding routines to check more carefully that they aren't running off the end of the page array. We may also consider rejecting calls that have any extra garbage appended. That would be safer, and within our rights by spec, but given the age of our server and the NFS protocol, and the fact that we've never enforced this before, we may need to balance that against the possibility of breaking some oddball client. Reported-by:
Tuomas Haanpää <thaan@synopsys.com> Reported-by:
Ari Kauppi <ari@synopsys.com> Reviewed-by:
NeilBrown <neilb@suse.com> Signed-off-by:
J. Bruce Fields <bfields@redhat.com> Signed-off-by:
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Dmitry Torokhov authored
commit 7c5bb4ac upstream. Clevo P650RS and other similar devices require i8042 to be reset in order to detect Synaptics touchpad. Reported-by:
Paweł Bylica <chfast@gmail.com> Tested-by:
Ed Bordin <edbordin@gmail.com> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=190301Signed-off-by:
Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by:
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Al Viro authored
commit 71d6ad08 upstream. Don't assume that server is sane and won't return more data than asked for. Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk> Signed-off-by:
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James Hogan authored
commit 162b270c upstream. KGDB is a kernel debug stub and it can't be used to debug userland as it can only safely access kernel memory. On MIPS however KGDB has always got the register state of sleeping processes from the userland register context at the beginning of the kernel stack. This is meaningless for kernel threads (which never enter userland), and for user threads it prevents the user seeing what it is doing while in the kernel: (gdb) info threads Id Target Id Frame ... 3 Thread 2 (kthreadd) 0x0000000000000000 in ?? () 2 Thread 1 (init) 0x000000007705c4b4 in ?? () 1 Thread -2 (shadowCPU0) 0xffffffff8012524c in arch_kgdb_breakpoint () at arch/mips/kernel/kgdb.c:201 Get the register state instead from the (partial) kernel register context stored in the task's thread_struct for resume() to restore. All threads now correctly appear to be in context_switch(): (gdb) info threads Id Target Id Frame ... 3 Thread 2 (kthreadd) context_switch (rq=<optimized out>, cookie=..., next=<optimized out>, prev=0x0) at kernel/sched/core.c:2903 2 Thread 1 (init) context_switch (rq=<optimized out>, cookie=..., next=<optimized out>, prev=0x0) at kernel/sched/core.c:2903 1 Thread -2 (shadowCPU0) 0xffffffff8012524c in arch_kgdb_breakpoint () at arch/mips/kernel/kgdb.c:201 Call clobbered registers which aren't saved and exception registers (BadVAddr & Cause) which can't be easily determined without stack unwinding are reported as 0. The PC is taken from the return address, such that the state presented matches that found immediately after returning from resume(). Fixes: 88547001 ("[MIPS] kgdb: add arch support for the kernel's kgdb core") Signed-off-by:
James Hogan <james.hogan@imgtec.com> Cc: Jason Wessel <jason.wessel@windriver.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/15829/Signed-off-by:
Ralf Baechle <ralf@linux-mips.org> Signed-off-by:
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Takashi Iwai authored
commit 4e7655fd upstream. The snd_use_lock_sync() (thus its implementation snd_use_lock_sync_helper()) has the 5 seconds timeout to break out of the sync loop. It was introduced from the beginning, just to be "safer", in terms of avoiding the stupid bugs. However, as Ben Hutchings suggested, this timeout rather introduces a potential leak or use-after-free that was apparently fixed by the commit 2d7d5400 ("ALSA: seq: Fix race during FIFO resize"): for example, snd_seq_fifo_event_in() -> snd_seq_event_dup() -> copy_from_user() could block for a long time, and snd_use_lock_sync() goes timeout and still leaves the cell at releasing the pool. For fixing such a problem, we remove the break by the timeout while still keeping the warning. Suggested-by:
Ben Hutchings <ben.hutchings@codethink.co.uk> Signed-off-by:
Takashi Iwai <tiwai@suse.de> Signed-off-by:
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Stefano Stabellini authored
commit c06b6d70 upstream. On slow platforms with unreliable TSC, such as QEMU emulated machines, it is possible for the kernel to request the next event in the past. In that case, in the current implementation of xen_vcpuop_clockevent, we simply return -ETIME. To be precise the Xen returns -ETIME and we pass it on. However the result of this is a missed event, which simply causes the kernel to hang. Instead it is better to always ask the hypervisor for a timer event, even if the timeout is in the past. That way there are no lost interrupts and the kernel survives. To do that, remove the VCPU_SSHOTTMR_future flag. Signed-off-by:
Stefano Stabellini <sstabellini@kernel.org> Acked-by:
Juergen Gross <jgross@suse.com> Cc: Julia Lawall <julia.lawall@lip6.fr> Signed-off-by:
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santosh.shilimkar@oracle.com authored
commit e47db94e upstream. Two different threads with different rds sockets may be in rds_recv_rcvbuf_delta() via receive path. If their ports both map to the same word in the congestion map, then using non-atomic ops to update it could cause the map to be incorrect. Lets use atomics to avoid such an issue. Full credit to Wengang <wen.gang.wang@oracle.com> for finding the issue, analysing it and also pointing out to offending code with spin lock based fix. Reviewed-by:
Leon Romanovsky <leon@leon.nu> Signed-off-by:
Wengang Wang <wen.gang.wang@oracle.com> Signed-off-by:
Santosh Shilimkar <santosh.shilimkar@oracle.com> Signed-off-by:
David S. Miller <davem@davemloft.net> Cc: Julia Lawall <julia.lawall@lip6.fr> Signed-off-by:
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Corey Minyard authored
commit c80e1b62 upstream. As part of handling a crash on an SMP system, an IPI is send to all other CPUs to save their current registers and stop. It was using task_pt_regs(current) to get the registers, but that will only be accurate if the CPU was interrupted running in userland. Instead allow the architecture to pass in the registers (all pass NULL now, but allow for the future) and then use get_irq_regs() which should be accurate as we are in an interrupt. Fall back to task_pt_regs(current) if nothing else is available. Signed-off-by:
Corey Minyard <cminyard@mvista.com> Cc: David Daney <ddaney@caviumnetworks.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/13050/Signed-off-by:
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Wei Fang authored
commit 816b0acf upstream. If first_bad == this_sector when we get the WriteMostly disk in read_balance(), valid disk will be returned with zero max_sectors. It'll lead to a dead loop in make_request(), and OOM will happen because of endless allocation of struct bio. Since we can't get data from this disk in this case, so continue for another disk. Signed-off-by:
Wei Fang <fangwei1@huawei.com> Signed-off-by:
Shaohua Li <shli@fb.com> Cc: Julia Lawall <julia.lawall@lip6.fr> Signed-off-by:
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Theodore Ts'o authored
commit 9e92f48c upstream. We aren't checking to see if the in-inode extended attribute is corrupted before we try to expand the inode's extra isize fields. This can lead to potential crashes caused by the BUG_ON() check in ext4_xattr_shift_entries(). [js] use EIO instead of undefined EFSCORRUPTED in 3.12 Signed-off-by:
Theodore Ts'o <tytso@mit.edu> Cc: Julia Lawall <julia.lawall@lip6.fr> Signed-off-by:
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Jamie Bainbridge authored
[ Upstream commit 105f5528 ] In situations where an skb is paged, the transport header pointer and tail pointer can be the same because the skb contents are in frags. This results in ioctl(SIOCINQ/FIONREAD) incorrectly returning a length of 0 when the length to receive is actually greater than zero. skb->len is already correctly set in ip6_input_finish() with pskb_pull(), so use skb->len as it always returns the correct result for both linear and paged data. Signed-off-by:
Jamie Bainbridge <jbainbri@redhat.com> Signed-off-by:
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Nikolay Aleksandrov authored
[ Upstream commit 723b929c ] Andrey Konovalov reported a BUG caused by the ip6mr code which is caused because we call unregister_netdevice_many for a device that is already being destroyed. In IPv4's ipmr that has been resolved by two commits long time ago by introducing the "notify" parameter to the delete function and avoiding the unregister when called from a notifier, so let's do the same for ip6mr. The trace from Andrey: ------------[ cut here ]------------ kernel BUG at net/core/dev.c:6813! invalid opcode: 0000 [#1] SMP KASAN Modules linked in: CPU: 1 PID: 1165 Comm: kworker/u4:3 Not tainted 4.11.0-rc7+ #251 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Workqueue: netns cleanup_net task: ffff880069208000 task.stack: ffff8800692d8000 RIP: 0010:rollback_registered_many+0x348/0xeb0 net/core/dev.c:6813 RSP: 0018:ffff8800692de7f0 EFLAGS: 00010297 RAX: ffff880069208000 RBX: 0000000000000002 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88006af90569 RBP: ffff8800692de9f0 R08: ffff8800692dec60 R09: 0000000000000000 R10: 0000000000000006 R11: 0000000000000000 R12: ffff88006af90070 R13: ffff8800692debf0 R14: dffffc0000000000 R15: ffff88006af90000 FS: 0000000000000000(0000) GS:ffff88006cb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe7e897d870 CR3: 00000000657e7000 CR4: 00000000000006e0 Call Trace: unregister_netdevice_many.part.105+0x87/0x440 net/core/dev.c:7881 unregister_netdevice_many+0xc8/0x120 net/core/dev.c:7880 ip6mr_device_event+0x362/0x3f0 net/ipv6/ip6mr.c:1346 notifier_call_chain+0x145/0x2f0 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x51/0x90 net/core/dev.c:1647 call_netdevice_notifiers net/core/dev.c:1663 rollback_registered_many+0x919/0xeb0 net/core/dev.c:6841 unregister_netdevice_many.part.105+0x87/0x440 net/core/dev.c:7881 unregister_netdevice_many net/core/dev.c:7880 default_device_exit_batch+0x4fa/0x640 net/core/dev.c:8333 ops_exit_list.isra.4+0x100/0x150 net/core/net_namespace.c:144 cleanup_net+0x5a8/0xb40 net/core/net_namespace.c:463 process_one_work+0xc04/0x1c10 kernel/workqueue.c:2097 worker_thread+0x223/0x19c0 kernel/workqueue.c:2231 kthread+0x35e/0x430 kernel/kthread.c:231 ret_from_fork+0x31/0x40 arch/x86/entry/entry_64.S:430 Code: 3c 32 00 0f 85 70 0b 00 00 48 b8 00 02 00 00 00 00 ad de 49 89 47 78 e9 93 fe ff ff 49 8d 57 70 49 8d 5f 78 eb 9e e8 88 7a 14 fe <0f> 0b 48 8b 9d 28 fe ff ff e8 7a 7a 14 fe 48 b8 00 00 00 00 00 RIP: rollback_registered_many+0x348/0xeb0 RSP: ffff8800692de7f0 ---[ end trace e0b29c57e9b3292c ]--- Reported-by:
Andrey Konovalov <andreyknvl@google.com> Signed-off-by:
Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Tested-by:
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Xin Long authored
[ Upstream commit 34b2789f ] Now sctp doesn't check sock's state before listening on it. It could even cause changing a sock with any state to become a listening sock when doing sctp_listen. This patch is to fix it by checking sock's state in sctp_listen, so that it will listen on the sock with right state. Reported-by:
Xin Long <lucien.xin@gmail.com> Acked-by:
Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by:
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Guillaume Nault authored
[ Upstream commit e08293a4 ] Take a reference on the sessions returned by l2tp_session_find_nth() (and rename it l2tp_session_get_nth() to reflect this change), so that caller is assured that the session isn't going to disappear while processing it. For procfs and debugfs handlers, the session is held in the .start() callback and dropped in .show(). Given that pppol2tp_seq_session_show() dereferences the associated PPPoL2TP socket and that l2tp_dfs_seq_session_show() might call pppol2tp_show(), we also need to call the session's .ref() callback to prevent the socket from going away from under us. Fixes: fd558d18 ("l2tp: Split pppol2tp patch into separate l2tp and ppp parts") Fixes: 0ad66140 ("l2tp: Add debugfs files for dumping l2tp debug info") Fixes: 309795f4 ("l2tp: Add netlink control API for L2TP") Signed-off-by:
Guillaume Nault <g.nault@alphalink.fr> Signed-off-by:
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Nathan Sullivan authored
[ Upstream commit 49d52e81 ] If the PHY is halted on stop, then do not set the state to PHY_UP. This ensures the phy will be restarted later in phy_start when the machine is started again. Fixes: 00db8189 ("This patch adds a PHY Abstraction Layer to the Linux Kernel, enabling ethernet drivers to remain as ignorant as is reasonable of the connected PHY's design and operation details.") Signed-off-by:
Nathan Sullivan <nathan.sullivan@ni.com> Signed-off-by:
Brad Mouring <brad.mouring@ni.com> Acked-by:
Xander Huff <xander.huff@ni.com> Acked-by:
Kyle Roeschley <kyle.roeschley@ni.com> Reviewed-by:
Florian Fainelli <f.fainelli@gmail.com> Signed-off-by:
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Eric Dumazet authored
[ Upstream commit 48481c8f ] Dmitry posted a nice reproducer of a bug triggering in neigh_probe() when dereferencing a NULL neigh->ops->solicit method. This can happen for arp_direct_ops/ndisc_direct_ops and similar, which can be used for NUD_NOARP neighbours (created when dev->header_ops is NULL). Admin can then force changing nud_state to some other state that would fire neigh timer. Signed-off-by:
Eric Dumazet <edumazet@google.com> Reported-by:
Dmitry Vyukov <dvyukov@google.com> Signed-off-by:
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Arnd Bergmann authored
commit 67893f12 upstream. We get a bogus warning about a potential uninitialized variable use in gfs2, because the compiler does not figure out that we never use the leaf number if get_leaf_nr() returns an error: fs/gfs2/dir.c: In function 'get_first_leaf': fs/gfs2/dir.c:802:9: warning: 'leaf_no' may be used uninitialized in this function [-Wmaybe-uninitialized] fs/gfs2/dir.c: In function 'dir_split_leaf': fs/gfs2/dir.c:1021:8: warning: 'leaf_no' may be used uninitialized in this function [-Wmaybe-uninitialized] Changing the 'if (!error)' to 'if (!IS_ERR_VALUE(error))' is sufficient to let gcc understand that this is exactly the same condition as in IS_ERR() so it can optimize the code path enough to understand it. Signed-off-by:
Arnd Bergmann <arnd@arndb.de> Signed-off-by:
Bob Peterson <rpeterso@redhat.com> Signed-off-by:
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Arnd Bergmann authored
commit 48dc5fb3 upstream. The driver reads a value from hfa384x_from_bap(), which may fail, and then assigns the value to a local variable. gcc detects that in in the failure case, the 'rlen' variable now contains uninitialized data: In file included from ../drivers/net/wireless/intersil/hostap/hostap_pci.c:220:0: drivers/net/wireless/intersil/hostap/hostap_hw.c: In function 'hfa384x_get_rid': drivers/net/wireless/intersil/hostap/hostap_hw.c:842:5: warning: 'rec' may be used uninitialized in this function [-Wmaybe-uninitialized] if (le16_to_cpu(rec.len) == 0) { This restructures the function as suggested by Russell King, to make it more readable and get more reliable error handling, by handling each failure mode using a goto. Signed-off-by:
Kalle Valo <kvalo@codeaurora.org> Signed-off-by:
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Arnd Bergmann authored
commit a4f642a8 upstream. The nozomi wireless data driver has its own helper function to transfer data from a FIFO, doing an extra byte swap on big-endian architectures, presumably to bring the data back into byte-serial order after readw() or readl() perform their implicit byteswap. This helper function is used in the receive_data() function to first read the length into a 32-bit variable, which causes a compile-time warning: drivers/tty/nozomi.c: In function 'receive_data': drivers/tty/nozomi.c:857:9: warning: 'size' may be used uninitialized in this function [-Wmaybe-uninitialized] The problem is that gcc is unsure whether the data was actually read or not. We know that it is at this point, so we can replace it with a single readl() to shut up that warning. I am leaving the byteswap in there, to preserve the existing behavior, even though this seems fishy: Reading the length of the data into a cpu-endian variable should normally not use a second byteswap on big-endian systems, unless the hardware is aware of the CPU endianess. There appears to be a lot more confusion about endianess in this driver, so it probably has not worked on big-endian systems in a long time, if ever, and I have no way to test it. It's well possible that this driver has not been used by anyone in a while, the last patch that looks like it was tested on the hardware is from 2008. Signed-off-by:
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Hongxu Jia authored
commit 17a49cd5 upstream. Since 09d96860 ("netfilter: x_tables: do compat validation via translate_table"), it used compatr structure to assign newinfo structure. In translate_compat_table of ip_tables.c and ip6_tables.c, it used compatr->hook_entry to replace info->hook_entry and compatr->underflow to replace info->underflow, but not do the same replacement in arp_tables.c. It caused invoking 32-bit "arptbale -P INPUT ACCEPT" failed in 64bit kernel. -------------------------------------- root@qemux86-64:~# arptables -P INPUT ACCEPT root@qemux86-64:~# arptables -P INPUT ACCEPT ERROR: Policy for `INPUT' offset 448 != underflow 0 arptables: Incompatible with this kernel -------------------------------------- Fixes: 09d96860 ("netfilter: x_tables: do compat validation via translate_table") Signed-off-by:
Hongxu Jia <hongxu.jia@windriver.com> Acked-by:
Florian Westphal <fw@strlen.de> Signed-off-by:
Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by:
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Andrey Konovalov authored
commit bcc5364b upstream. When calculating po->tp_hdrlen + po->tp_reserve the result can overflow. Fix by checking that tp_reserve <= INT_MAX on assign. Signed-off-by:
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Andrey Konovalov authored
commit 8f8d28e4 upstream. When calculating rb->frames_per_block * req->tp_block_nr the result can overflow. Add a check that tp_block_size * tp_block_nr <= UINT_MAX. Since frames_per_block <= tp_block_size, the expression would never overflow. Signed-off-by:
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Eric Dumazet authored
commit 43a66845 upstream. We got a report of yet another bug in ping http://www.openwall.com/lists/oss-security/2017/03/24/6 ->disconnect() is not called with socket lock held. Fix this by acquiring ping rwlock earlier. Thanks to Daniel, Alexander and Andrey for letting us know this problem. Fixes: c319b4d7 ("net: ipv4: add IPPROTO_ICMP socket kind") Signed-off-by:
Daniel Jiang <danieljiang0415@gmail.com> Reported-by:
Solar Designer <solar@openwall.com> Reported-by:
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Michael Ellerman authored
commit 60e065f7 upstream. There is a bug in binutils 2.24 which causes miscompilation if we're building little endian and using weak symbols (which the kernel does). It is fixed in binutils commit 57fa7b8c7e59 "Correct elf_merge_st_other arguments for weak symbols", which is in binutils 2.25 and has been backported to the binutils 2.24 branch and has been picked up by most distros it seems. However if we're running stock 2.24 (no extra version) then the bug is present, so check for that and bail. Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Signed-off-by:
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Dan Williams authored
commit ac34f15e upstream. When tearing down a block device early in its lifetime, userspace may still be performing discovery actions like blkdev_ioctl() to re-read partitions. The nvdimm_revalidate_disk() implementation depends on disk->driverfs_dev to be valid at entry. However, it is set to NULL in del_gendisk() and fatally this is happening *before* the disk device is deleted from userspace view. There's no reason for del_gendisk() to clear ->driverfs_dev. That device is the parent of the disk. It is guaranteed to not be freed until the disk, as a child, drops its ->parent reference. We could also fix this issue locally in nvdimm_revalidate_disk() by using disk_to_dev(disk)->parent, but lets fix it globally since ->driverfs_dev follows the lifetime of the parent. Longer term we should probably just add a @parent parameter to add_disk(), and stop carrying this pointer in the gendisk. BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<ffffffffa00340a8>] nvdimm_revalidate_disk+0x18/0x90 [libnvdimm] CPU: 2 PID: 538 Comm: systemd-udevd Tainted: G O 4.4.0-rc5 #2257 [..] Call Trace: [<ffffffff8143e5c7>] rescan_partitions+0x87/0x2c0 [<ffffffff810f37f9>] ? __lock_is_held+0x49/0x70 [<ffffffff81438c62>] __blkdev_reread_part+0x72/0xb0 [<ffffffff81438cc5>] blkdev_reread_part+0x25/0x40 [<ffffffff8143982d>] blkdev_ioctl+0x4fd/0x9c0 [<ffffffff811246c9>] ? current_kernel_time64+0x69/0xd0 [<ffffffff812916dd>] block_ioctl+0x3d/0x50 [<ffffffff81264c38>] do_vfs_ioctl+0x308/0x560 [<ffffffff8115dbd1>] ? __audit_syscall_entry+0xb1/0x100 [<ffffffff810031d6>] ? do_audit_syscall_entry+0x66/0x70 [<ffffffff81264f09>] SyS_ioctl+0x79/0x90 [<ffffffff81902672>] entry_SYSCALL_64_fastpath+0x12/0x76 Cc: Jan Kara <jack@suse.cz> Cc: Jens Axboe <axboe@fb.com> Reported-by:
Robert Hu <robert.hu@intel.com> Signed-off-by:
Dan Williams <dan.j.williams@intel.com> Signed-off-by:
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Suzuki K Poulose authored
commit 8b3405e3 upstream. In kvm_free_stage2_pgd() we don't hold the kvm->mmu_lock while calling unmap_stage2_range() on the entire memory range for the guest. This could cause problems with other callers (e.g, munmap on a memslot) trying to unmap a range. And since we have to unmap the entire Guest memory range holding a spinlock, make sure we yield the lock if necessary, after we unmap each PUD range. [skp] provided backport for 3.12 Fixes: commit d5d8184d ("KVM: ARM: Memory virtualization setup") Cc: Paolo Bonzini <pbonzin@redhat.com> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Christoffer Dall <christoffer.dall@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Signed-off-by:
Suzuki K Poulose <suzuki.poulose@arm.com> [ Avoid vCPU starvation and lockup detector warnings ] Signed-off-by:
Marc Zyngier <marc.zyngier@arm.com> Signed-off-by:
Christoffer Dall <cdall@linaro.org> Signed-off-by:
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Yazen Ghannam authored
commit 29f72ce3 upstream. MCA bank 3 is reserved on systems pre-Fam17h, so it didn't have a name. However, MCA bank 3 is defined on Fam17h systems and can be accessed using legacy MSRs. Without a name we get a stack trace on Fam17h systems when trying to register sysfs files for bank 3 on kernels that don't recognize Scalable MCA. Call MCA bank 3 "decode_unit" since this is what it represents on Fam17h. This will allow kernels without SMCA support to see this bank on Fam17h+ and prevent the stack trace. This will not affect older systems since this bank is reserved on them, i.e. it'll be ignored. Tested on AMD Fam15h and Fam17h systems. WARNING: CPU: 26 PID: 1 at lib/kobject.c:210 kobject_add_internal kobject: (ffff88085bb256c0): attempted to be registered with empty name! ... Call Trace: kobject_add_internal kobject_add kobject_create_and_add threshold_create_device threshold_init_device Signed-off-by:
Yazen Ghannam <yazen.ghannam@amd.com> Signed-off-by:
Borislav Petkov <bp@suse.de> Link: http://lkml.kernel.org/r/1490102285-3659-1-git-send-email-Yazen.Ghannam@amd.comSigned-off-by:
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Sebastian Siewior authored
commit 9cd9a21c upstream. In commit 6afaf8a4 ("UBI: flush wl before clearing update marker") I managed to trigger and fix a similar bug. Now here is another version of which I assumed it wouldn't matter back then but it turns out UBI has a check for it and will error out like this: |ubi0 warning: validate_vid_hdr: inconsistent used_ebs |ubi0 error: validate_vid_hdr: inconsistent VID header at PEB 592 All you need to trigger this is? "ubiupdatevol /dev/ubi0_0 file" + a powercut in the middle of the operation. ubi_start_update() sets the update-marker and puts all EBs on the erase list. After that userland can proceed to write new data while the old EB aren't erased completely. A powercut at this point is usually not that much of a tragedy. UBI won't give read access to the static volume because it has the update marker. It will most likely set the corrupted flag because it misses some EBs. So we are all good. Unless the size of the image that has been written differs from the old image in the magnitude of at least one EB. In that case UBI will find two different values for `used_ebs' and refuse to attach the image with the error message mentioned above. So in order not to get in the situation, the patch will ensure that we wait until everything is removed before it tries to write any data. The alternative would be to detect such a case and remove all EBs at the attached time after we processed the volume-table and see the update-marker set. The patch looks bigger and I doubt it is worth it since usually the write() will wait from time to time for a new EB since usually there not that many spare EB that can be used. Signed-off-by:
Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by:
Richard Weinberger <richard@nod.at> Signed-off-by:
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Arnd Bergmann authored
commit fe8c470a upstream. gcc -O2 cannot always prove that the loop in acpi_power_get_inferred_state() is enterered at least once, so it assumes that cur_state might not get initialized: drivers/acpi/power.c: In function 'acpi_power_get_inferred_state': drivers/acpi/power.c:222:9: error: 'cur_state' may be used uninitialized in this function [-Werror=maybe-uninitialized] This sets the variable to zero at the start of the loop, to ensure that there is well-defined behavior even for an empty list. This gets rid of the warning. The warning first showed up when the -Os flag got removed in a bug fix patch in linux-4.11-rc5. I would suggest merging this addon patch on top of that bug fix to avoid introducing a new warning in the stable kernels. Fixes: 61b79e16 (ACPI: Fix incompatibility with mcount-based function graph tracing) Signed-off-by:
Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by:
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Thorsten Leemhuis authored
commit 704de489 upstream. Temporary got a Lifebook E547 into my hands and noticed the touchpad only works after running: echo "1" > /sys/devices/platform/i8042/serio2/crc_enabled Add it to the list of machines that need this workaround. Signed-off-by:
Thorsten Leemhuis <linux@leemhuis.info> Reviewed-by:
Ulrik De Bie <ulrik.debie-os@e2big.org> Signed-off-by:
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Vitaly Kuznetsov authored
commit 396e287f upstream. vmbus_teardown_gpadl() can result in infinite wait when it is called on 5 second timeout in vmbus_open(). The issue is caused by the fact that gpadl teardown operation won't ever succeed for an opened channel and the timeout isn't always enough. As a guest, we can always trust the host to respond to our request (and there is nothing we can do if it doesn't). Signed-off-by:
Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by:
K. Y. Srinivasan <kys@microsoft.com> Signed-off-by:
Sumit Semwal <sumit.semwal@linaro.org> Signed-off-by:
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Vitaly Kuznetsov authored
commit 7cc80c98 upstream. In some cases create_gpadl_header() allocates submessages but we never free them. [sumits] Note for stable: Upstream commit 4d637632: (Drivers: hv: get rid of redundant messagecount in create_gpadl_header()) changes the list usage to initialize list header in all cases; that patch isn't added to stable, so the current patch is modified a little bit from the upstream commit to check if the list is valid or not. Signed-off-by:
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Germano Percossi authored
commit a0918f1c upstream. STATUS_BAD_NETWORK_NAME can be received during node failover, causing the flag to be set and making the reconnect thread always unsuccessful, thereafter. Once the only place where it is set is removed, the remaining bits are rendered moot. Removing it does not prevent "mount" from failing when a non existent share is passed. What happens when the share really ceases to exist while the share is mounted is undefined now as much as it was before. Signed-off-by:
Germano Percossi <germano.percossi@citrix.com> Reviewed-by:
Pavel Shilovsky <pshilov@microsoft.com> Signed-off-by:
Steve French <smfrench@gmail.com> Signed-off-by:
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Sachin Prabhu authored
commit 62a6cfdd upstream. commit 4fcd1813 ("Fix reconnect to not defer smb3 session reconnect long after socket reconnect") added support for Negotiate requests to be initiated by echo calls. To avoid delays in calling echo after a reconnect, I added the patch introduced by the commit b8c60012 ("Call echo service immediately after socket reconnect"). This has however caused a regression with cifs shares which do not have support for echo calls to trigger Negotiate requests. On connections which need to call Negotiation, the echo calls trigger an error which triggers a reconnect which in turn triggers another echo call. This results in a loop which is only broken when an operation is performed on the cifs share. For an idle share, it can DOS a server. The patch uses the smb_operation can_echo() for cifs so that it is called only if connection has been already been setup. kernel bz: 194531 Signed-off-by:
Sachin Prabhu <sprabhu@redhat.com> Tested-by:
Jonathan Liu <net147@gmail.com> Acked-by:
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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:
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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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