- 08 Jun, 2020 32 commits
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Vladis Dronov authored
BugLink: https://bugs.launchpad.net/bugs/1881356 commit a33121e5 upstream. In a case when a ptp chardev (like /dev/ptp0) is open but an underlying device is removed, closing this file leads to a race. This reproduces easily in a kvm virtual machine: ts# cat openptp0.c int main() { ... fp = fopen("/dev/ptp0", "r"); ... sleep(10); } ts# uname -r 5.5.0-rc3-46cf053e ts# cat /proc/cmdline ... slub_debug=FZP ts# modprobe ptp_kvm ts# ./openptp0 & [1] 670 opened /dev/ptp0, sleeping 10s... ts# rmmod ptp_kvm ts# ls /dev/ptp* ls: cannot access '/dev/ptp*': No such file or directory ts# ...woken up [ 48.010809] general protection fault: 0000 [#1] SMP [ 48.012502] CPU: 6 PID: 658 Comm: openptp0 Not tainted 5.5.0-rc3-46cf053e #25 [ 48.014624] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), ... [ 48.016270] RIP: 0010:module_put.part.0+0x7/0x80 [ 48.017939] RSP: 0018:ffffb3850073be00 EFLAGS: 00010202 [ 48.018339] RAX: 000000006b6b6b6b RBX: 6b6b6b6b6b6b6b6b RCX: ffff89a476c00ad0 [ 48.018936] RDX: fffff65a08d3ea08 RSI: 0000000000000247 RDI: 6b6b6b6b6b6b6b6b [ 48.019470] ... ^^^ a slub poison [ 48.023854] Call Trace: [ 48.024050] __fput+0x21f/0x240 [ 48.024288] task_work_run+0x79/0x90 [ 48.024555] do_exit+0x2af/0xab0 [ 48.024799] ? vfs_write+0x16a/0x190 [ 48.025082] do_group_exit+0x35/0x90 [ 48.025387] __x64_sys_exit_group+0xf/0x10 [ 48.025737] do_syscall_64+0x3d/0x130 [ 48.026056] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 48.026479] RIP: 0033:0x7f53b12082f6 [ 48.026792] ... [ 48.030945] Modules linked in: ptp i6300esb watchdog [last unloaded: ptp_kvm] [ 48.045001] Fixing recursive fault but reboot is needed! This happens in: static void __fput(struct file *file) { ... if (file->f_op->release) file->f_op->release(inode, file); <<< cdev is kfree'd here if (unlikely(S_ISCHR(inode->i_mode) && inode->i_cdev != NULL && !(mode & FMODE_PATH))) { cdev_put(inode->i_cdev); <<< cdev fields are accessed here Namely: __fput() posix_clock_release() kref_put(&clk->kref, delete_clock) <<< the last reference delete_clock() delete_ptp_clock() kfree(ptp) <<< cdev is embedded in ptp cdev_put module_put(p->owner) <<< *p is kfree'd, bang! Here cdev is embedded in posix_clock which is embedded in ptp_clock. The race happens because ptp_clock's lifetime is controlled by two refcounts: kref and cdev.kobj in posix_clock. This is wrong. Make ptp_clock's sysfs device a parent of cdev with cdev_device_add() created especially for such cases. This way the parent device with its ptp_clock is not released until all references to the cdev are released. This adds a requirement that an initialized but not exposed struct device should be provided to posix_clock_register() by a caller instead of a simple dev_t. This approach was adopted from the commit 72139dfa ("watchdog: Fix the race between the release of watchdog_core_data and cdev"). See details of the implementation in the commit 233ed09d ("chardev: add helper function to register char devs with a struct device"). Link: https://lore.kernel.org/linux-fsdevel/20191125125342.6189-1-vdronov@redhat.com/T/#uAnalyzed-by:
Stephen Johnston <sjohnsto@redhat.com> Analyzed-by:
Vern Lovejoy <vlovejoy@redhat.com> Signed-off-by:
Vladis Dronov <vdronov@redhat.com> Acked-by:
Richard Cochran <richardcochran@gmail.com> Signed-off-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
Ben Hutchings <ben.hutchings@codethink.co.uk> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by:
Ian May <ian.may@canonical.com> Signed-off-by:
Kelsey Skunberg <kelsey.skunberg@canonical.com>
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YueHaibing authored
BugLink: https://bugs.launchpad.net/bugs/1881356 commit aea0a897 upstream. Fix smatch warning: drivers/ptp/ptp_clock.c:298 ptp_clock_register() warn: passing zero to 'ERR_PTR' 'err' should be set while device_create_with_groups and pps_register_source fails Fixes: 85a66e55 ("ptp: create "pins" together with the rest of attributes") Signed-off-by:
YueHaibing <yuehaibing@huawei.com> Acked-by:
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Logan Gunthorpe authored
BugLink: https://bugs.launchpad.net/bugs/1881356 commit 233ed09d upstream. Credit for this patch goes is shared with Dan Williams [1]. I've taken things one step further to make the helper function more useful and clean up calling code. There's a common pattern in the kernel whereby a struct cdev is placed in a structure along side a struct device which manages the life-cycle of both. In the naive approach, the reference counting is broken and the struct device can free everything before the chardev code is entirely released. Many developers have solved this problem by linking the internal kobjs in this fashion: cdev.kobj.parent = &parent_dev.kobj; The cdev code explicitly gets and puts a reference to it's kobj parent. So this seems like it was intended to be used this way. Dmitrty Torokhov first put this in place in 2012 with this commit: 2f0157f1 char_dev: pin parent kobject and the first instance of the fix was then done in the input subsystem in the following commit: 4a215aad Input: fix use-after-free introduced with dynamic minor changes Subsequently over the years, however, this issue seems to have tripped up multiple developers independently. For example, see these commits: 0d5b7dae iio: Prevent race between IIO chardev opening and IIO device (by Lars-Peter Clausen in 2013) ba0ef854 tpm: Fix initialization of the cdev (by Jason Gunthorpe in 2015) 5b28dde5 [media] media: fix use-after-free in cdev_put() when app exits after driver unbind (by Shauh Khan in 2016) This technique is similarly done in at least 15 places within the kernel and probably should have been done so in another, at least, 5 places. The kobj line also looks very suspect in that one would not expect drivers to have to mess with kobject internals in this way. Even highly experienced kernel developers can be surprised by this code, as seen in [2]. To help alleviate this situation, and hopefully prevent future wasted effort on this problem, this patch introduces a helper function to register a char device along with its parent struct device. This creates a more regular API for tying a char device to its parent without the developer having to set members in the underlying kobject. This patch introduce cdev_device_add and cdev_device_del which replaces a common pattern including setting the kobj parent, calling cdev_add and then calling device_add. It also introduces cdev_set_parent for the few cases that set the kobject parent without using device_add. [1] https://lkml.org/lkml/2017/2/13/700 [2] https://lkml.org/lkml/2017/2/10/370Signed-off-by:
Logan Gunthorpe <logang@deltatee.com> Signed-off-by:
Dan Williams <dan.j.williams@intel.com> Reviewed-by:
Hans Verkuil <hans.verkuil@cisco.com> Reviewed-by:
Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by:
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Dmitry Torokhov authored
BugLink: https://bugs.launchpad.net/bugs/1881356 commit 85a66e55 upstream. Let's switch to using device_create_with_groups(), which will allow us to create "pins" attribute group together with the rest of ptp device attributes, and before userspace gets notified about ptp device creation. Signed-off-by:
Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by:
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Dmitry Torokhov authored
BugLink: https://bugs.launchpad.net/bugs/1881356 commit af59e717 upstream. Instead of creating selected attributes after the device is created (and after userspace potentially seen uevent), lets use attribute group is_visible() method to control which attributes are shown. This will allow us to create all attributes (except "pins" group, which will be taken care of later) before userspace gets notified about new ptp class device. Signed-off-by:
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Dmitry Torokhov authored
BugLink: https://bugs.launchpad.net/bugs/1881356 commit 882f312d upstream. We do not need explicitly call dev_set_drvdata(), as it is done for us by device_create(). Acked-by:
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Jens Axboe authored
BugLink: https://bugs.launchpad.net/bugs/1881356 commit 2967acbb upstream. A previous commit changed the locking around registration/cleanup, but direct callers of blk_trace_remove() were missed. This means that if we hit the error path in setup, we will deadlock on attempting to re-acquire the queue trace mutex. Fixes: 1f2cac10 ("blktrace: fix unlocked access to init/start-stop/teardown") Signed-off-by:
Jens Axboe <axboe@kernel.dk> Signed-off-by:
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Jens Axboe authored
BugLink: https://bugs.launchpad.net/bugs/1881356 commit 1f2cac10 upstream. sg.c calls into the blktrace functions without holding the proper queue mutex for doing setup, start/stop, or teardown. Add internal unlocked variants, and export the ones that do the proper locking. Fixes: 6da127ad ("blktrace: Add blktrace ioctls to SCSI generic devices") Tested-by:
Dmitry Vyukov <dvyukov@google.com> Signed-off-by:
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Waiman Long authored
BugLink: https://bugs.launchpad.net/bugs/1881356 commit 5acb3cc2 upstream. The lockdep code had reported the following unsafe locking scenario: CPU0 CPU1 ---- ---- lock(s_active#228); lock(&bdev->bd_mutex/1); lock(s_active#228); lock(&bdev->bd_mutex); *** DEADLOCK *** The deadlock may happen when one task (CPU1) is trying to delete a partition in a block device and another task (CPU0) is accessing tracing sysfs file (e.g. /sys/block/dm-1/trace/act_mask) in that partition. The s_active isn't an actual lock. It is a reference count (kn->count) on the sysfs (kernfs) file. Removal of a sysfs file, however, require a wait until all the references are gone. The reference count is treated like a rwsem using lockdep instrumentation code. The fact that a thread is in the sysfs callback method or in the ioctl call means there is a reference to the opended sysfs or device file. That should prevent the underlying block structure from being removed. Instead of using bd_mutex in the block_device structure, a new blk_trace_mutex is now added to the request_queue structure to protect access to the blk_trace structure. Suggested-by:
Christoph Hellwig <hch@infradead.org> Signed-off-by:
Waiman Long <longman@redhat.com> Acked-by:
Steven Rostedt (VMware) <rostedt@goodmis.org> Fix typo in patch subject line, and prune a comment detailing how the code used to work. Signed-off-by:
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Shijie Luo authored
BugLink: https://bugs.launchpad.net/bugs/1881356 commit af133ade upstream. When journal size is set too big by "mkfs.ext4 -J size=", or when we mount a crafted image to make journal inode->i_size too big, the loop, "while (i < num)", holds cpu too long. This could cause soft lockup. [ 529.357541] Call trace: [ 529.357551] dump_backtrace+0x0/0x198 [ 529.357555] show_stack+0x24/0x30 [ 529.357562] dump_stack+0xa4/0xcc [ 529.357568] watchdog_timer_fn+0x300/0x3e8 [ 529.357574] __hrtimer_run_queues+0x114/0x358 [ 529.357576] hrtimer_interrupt+0x104/0x2d8 [ 529.357580] arch_timer_handler_virt+0x38/0x58 [ 529.357584] handle_percpu_devid_irq+0x90/0x248 [ 529.357588] generic_handle_irq+0x34/0x50 [ 529.357590] __handle_domain_irq+0x68/0xc0 [ 529.357593] gic_handle_irq+0x6c/0x150 [ 529.357595] el1_irq+0xb8/0x140 [ 529.357599] __ll_sc_atomic_add_return_acquire+0x14/0x20 [ 529.357668] ext4_map_blocks+0x64/0x5c0 [ext4] [ 529.357693] ext4_setup_system_zone+0x330/0x458 [ext4] [ 529.357717] ext4_fill_super+0x2170/0x2ba8 [ext4] [ 529.357722] mount_bdev+0x1a8/0x1e8 [ 529.357746] ext4_mount+0x44/0x58 [ext4] [ 529.357748] mount_fs+0x50/0x170 [ 529.357752] vfs_kern_mount.part.9+0x54/0x188 [ 529.357755] do_mount+0x5ac/0xd78 [ 529.357758] ksys_mount+0x9c/0x118 [ 529.357760] __arm64_sys_mount+0x28/0x38 [ 529.357764] el0_svc_common+0x78/0x130 [ 529.357766] el0_svc_handler+0x38/0x78 [ 529.357769] el0_svc+0x8/0xc [ 541.356516] watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [mount:18674] Link: https://lore.kernel.org/r/20200211011752.29242-1-luoshijie1@huawei.comReviewed-by:
Jan Kara <jack@suse.cz> Signed-off-by:
Shijie Luo <luoshijie1@huawei.com> Signed-off-by:
Theodore Ts'o <tytso@mit.edu> Cc: stable@kernel.org Signed-off-by:
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Kees Cook authored
BugLink: https://bugs.launchpad.net/bugs/1881356 commit 7be3cb01 upstream. When brk was moved for binaries without an interpreter, it should have been limited to ET_DYN only. In other words, the special case was an ET_DYN that lacks an INTERP, not just an executable that lacks INTERP. The bug manifested for giant static executables, where the brk would end up in the middle of the text area on 32-bit architectures. Reported-and-tested-by:
Richard Kojedzinszky <richard@kojedz.in> Fixes: bbdc6076 ("binfmt_elf: move brk out of mmap when doing direct loader exec") Cc: stable@vger.kernel.org Signed-off-by:
Kees Cook <keescook@chromium.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org> Cc: Guenter Roeck <linux@roeck-us.net> Signed-off-by:
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Alexandre Belloni authored
BugLink: https://bugs.launchpad.net/bugs/1881356 [ Upstream commit f5aba91d ] At least on ksz8081, when getting back from power down, interrupts are disabled. ensure they are reenabled if they were previously enabled. This fixes resuming which is failing on the xplained boards from atmel since 321beec5 (net: phy: Use interrupts when available in NOLINK state) Fixes: 321beec5 (net: phy: Use interrupts when available in NOLINK state) Signed-off-by:
Sasha Levin <sashal@kernel.org> Signed-off-by:
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Ivan Delalande authored
BugLink: https://bugs.launchpad.net/bugs/1881356 commit e08df079 upstream. If the trapping instruction contains a ':', for a memory access through segment registers for example, the sed substitution will insert the '*' marker in the middle of the instruction instead of the line address: 2b: 65 48 0f c7 0f cmpxchg16b %gs:*(%rdi) <-- trapping instruction I started to think I had forgotten some quirk of the assembly syntax before noticing that it was actually coming from the script. Fix it to add the address marker at the right place for these instructions: 28: 49 8b 06 mov (%r14),%rax 2b:* 65 48 0f c7 0f cmpxchg16b %gs:(%rdi) <-- trapping instruction 30: 0f 94 c0 sete %al Fixes: 18ff44b1 ("scripts/decodecode: make faulting insn ptr more robust") Signed-off-by:
Ivan Delalande <colona@arista.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Reviewed-by:
Borislav Petkov <bp@suse.de> Link: http://lkml.kernel.org/r/20200419223653.GA31248@visorSigned-off-by:
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George Spelvin authored
BugLink: https://bugs.launchpad.net/bugs/1881356 commit fd0c42c4 upstream. and change to pseudorandom numbers, as this is a traffic dithering operation that doesn't need crypto-grade. The previous code operated in 4 steps: 1. Generate a random byte 0 <= rand_tq <= 255 2. Multiply it by BATADV_TQ_MAX_VALUE - tq 3. Divide by 255 (= BATADV_TQ_MAX_VALUE) 4. Return BATADV_TQ_MAX_VALUE - rand_tq This would apperar to scale (BATADV_TQ_MAX_VALUE - tq) by a random value between 0/255 and 255/255. But! The intermediate value between steps 3 and 4 is stored in a u8 variable. So it's truncated, and most of the time, is less than 255, after which the division produces 0. Specifically, if tq is odd, the product is always even, and can never be 255. If tq is even, there's exactly one random byte value that will produce a product byte of 255. Thus, the return value is 255 (511/512 of the time) or 254 (1/512 of the time). If we assume that the truncation is a bug, and the code is meant to scale the input, a simpler way of looking at it is that it's returning a random value between tq and BATADV_TQ_MAX_VALUE, inclusive. Well, we have an optimized function for doing just that. Fixes: 3c12de9a ("batman-adv: network coding - code and transmit packets if possible") Signed-off-by:
George Spelvin <lkml@sdf.org> Signed-off-by:
Sven Eckelmann <sven@narfation.org> Signed-off-by:
Simon Wunderlich <sw@simonwunderlich.de> Signed-off-by:
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Oliver Neukum authored
BugLink: https://bugs.launchpad.net/bugs/1881356 commit e9b3c610 upstream. We must not process packets shorter than a packet ID Signed-off-by:
Oliver Neukum <oneukum@suse.com> Reported-and-tested-by: syzbot+d29e9263e13ce0b9f4fd@syzkaller.appspotmail.com Fixes: 1da177e4 ("Linux-2.6.12-rc2") Cc: stable <stable@vger.kernel.org> Signed-off-by:
Johan Hovold <johan@kernel.org> Signed-off-by:
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Oliver Neukum authored
BugLink: https://bugs.launchpad.net/bugs/1881356 commit 9f04db23 upstream. This device needs US_FL_NO_REPORT_OPCODES to avoid going through prolonged error handling on enumeration. Signed-off-by:
Julian Groß <julian.g@posteo.de> Cc: stable <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20200429155218.7308-1-oneukum@suse.comSigned-off-by:
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Alex Estrin authored
BugLink: https://bugs.launchpad.net/bugs/1881356 commit 612601d0 upstream. commit 9a9b8112 will cause core to fail UD QP from being destroyed on ipoib unload, therefore cause resources leakage. On pkey change event above patch modifies mgid before calling underlying driver to detach it from QP. Drivers' detach_mcast() will fail to find modified mgid it was never given to attach in a first place. Core qp->usecnt will never go down, so ib_destroy_qp() will fail. IPoIB driver actually does take care of new broadcast mgid based on new pkey by destroying an old mcast object in ipoib_mcast_dev_flush()) .... if (priv->broadcast) { rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree); list_add_tail(&priv->broadcast->list, &remove_list); priv->broadcast = NULL; } ... then in restarted ipoib_macst_join_task() creating a new broadcast mcast object, sending join request and on completion tells the driver to attach to reinitialized QP: ... if (!priv->broadcast) { ... broadcast = ipoib_mcast_alloc(dev, 0); ... memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4, sizeof (union ib_gid)); priv->broadcast = broadcast; ... Fixes: 9a9b8112 ("IB/ipoib: Update broadcast object if PKey value was changed in index 0") Cc: stable@vger.kernel.org Reviewed-by:
Mike Marciniszyn <mike.marciniszyn@intel.com> Reviewed-by:
Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by:
Alex Estrin <alex.estrin@intel.com> Signed-off-by:
Feras Daoud <ferasda@mellanox.com> Signed-off-by:
Doug Ledford <dledford@redhat.com> Cc: Guenter Roeck <linux@roeck-us.net> Signed-off-by:
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Ville Syrjälä authored
BugLink: https://bugs.launchpad.net/bugs/1881356 commit 6f6060a5 upstream. APM_DO_POP_SEGS does not restore fs/gs which were zeroed by APM_DO_ZERO_SEGS. Trying to access __preempt_count with zeroed fs doesn't really work. Move the ibrs call outside the APM_DO_SAVE_SEGS/APM_DO_RESTORE_SEGS invocations so that fs is actually restored before calling preempt_enable(). Fixes the following sort of oopses: [ 0.313581] general protection fault: 0000 [#1] PREEMPT SMP [ 0.313803] Modules linked in: [ 0.314040] CPU: 0 PID: 268 Comm: kapmd Not tainted 4.16.0-rc1-triton-bisect-00090-gdd84441a #19 [ 0.316161] EIP: __apm_bios_call_simple+0xc8/0x170 [ 0.316161] EFLAGS: 00210016 CPU: 0 [ 0.316161] EAX: 00000102 EBX: 00000000 ECX: 00000102 EDX: 00000000 [ 0.316161] ESI: 0000530e EDI: dea95f64 EBP: dea95f18 ESP: dea95ef0 [ 0.316161] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 [ 0.316161] CR0: 80050033 CR2: 00000000 CR3: 015d3000 CR4: 000006d0 [ 0.316161] Call Trace: [ 0.316161] ? cpumask_weight.constprop.15+0x20/0x20 [ 0.316161] on_cpu0+0x44/0x70 [ 0.316161] apm+0x54e/0x720 [ 0.316161] ? __switch_to_asm+0x26/0x40 [ 0.316161] ? __schedule+0x17d/0x590 [ 0.316161] kthread+0xc0/0xf0 [ 0.316161] ? proc_apm_show+0x150/0x150 [ 0.316161] ? kthread_create_worker_on_cpu+0x20/0x20 [ 0.316161] ret_from_fork+0x2e/0x38 [ 0.316161] Code: da 8e c2 8e e2 8e ea 57 55 2e ff 1d e0 bb 5d b1 0f 92 c3 5d 5f 07 1f 89 47 0c 90 8d b4 26 00 00 00 00 90 8d b4 26 00 00 00 00 90 <64> ff 0d 84 16 5c b1 74 7f 8b 45 dc 8e e0 8b 45 d8 8e e8 8b 45 [ 0.316161] EIP: __apm_bios_call_simple+0xc8/0x170 SS:ESP: 0068:dea95ef0 [ 0.316161] ---[ end trace 656253db2deaa12c ]--- Fixes: dd84441a ("x86/speculation: Use IBRS if available before calling into firmware") Signed-off-by:
Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Cc: stable@vger.kernel.org Cc: David Woodhouse <dwmw@amazon.co.uk> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: x86@kernel.org Cc: David Woodhouse <dwmw@amazon.co.uk> Cc: "H. Peter Anvin" <hpa@zytor.com> Link: https://lkml.kernel.org/r/20180709133534.5963-1-ville.syrjala@linux.intel.com Cc: Guenter Roeck <linux@roeck-us.net> Signed-off-by:
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Kees Cook authored
BugLink: https://bugs.launchpad.net/bugs/1881356 commit bbdc6076 upstream. Commmit eab09532 ("binfmt_elf: use ELF_ET_DYN_BASE only for PIE"), made changes in the rare case when the ELF loader was directly invoked (e.g to set a non-inheritable LD_LIBRARY_PATH, testing new versions of the loader), by moving into the mmap region to avoid both ET_EXEC and PIE binaries. This had the effect of also moving the brk region into mmap, which could lead to the stack and brk being arbitrarily close to each other. An unlucky process wouldn't get its requested stack size and stack allocations could end up scribbling on the heap. This is illustrated here. In the case of using the loader directly, brk (so helpfully identified as "[heap]") is allocated with the _loader_ not the binary. For example, with ASLR entirely disabled, you can see this more clearly: $ /bin/cat /proc/self/maps 555555554000-55555555c000 r-xp 00000000 ... /bin/cat 55555575b000-55555575c000 r--p 00007000 ... /bin/cat 55555575c000-55555575d000 rw-p 00008000 ... /bin/cat 55555575d000-55555577e000 rw-p 00000000 ... [heap] ... 7ffff7ff7000-7ffff7ffa000 r--p 00000000 ... [vvar] 7ffff7ffa000-7ffff7ffc000 r-xp 00000000 ... [vdso] 7ffff7ffc000-7ffff7ffd000 r--p 00027000 ... /lib/x86_64-linux-gnu/ld-2.27.so 7ffff7ffd000-7ffff7ffe000 rw-p 00028000 ... /lib/x86_64-linux-gnu/ld-2.27.so 7ffff7ffe000-7ffff7fff000 rw-p 00000000 ... 7ffffffde000-7ffffffff000 rw-p 00000000 ... [stack] $ /lib/x86_64-linux-gnu/ld-2.27.so /bin/cat /proc/self/maps ... 7ffff7bcc000-7ffff7bd4000 r-xp 00000000 ... /bin/cat 7ffff7bd4000-7ffff7dd3000 ---p 00008000 ... /bin/cat 7ffff7dd3000-7ffff7dd4000 r--p 00007000 ... /bin/cat 7ffff7dd4000-7ffff7dd5000 rw-p 00008000 ... /bin/cat 7ffff7dd5000-7ffff7dfc000 r-xp 00000000 ... /lib/x86_64-linux-gnu/ld-2.27.so 7ffff7fb2000-7ffff7fd6000 rw-p 00000000 ... 7ffff7ff7000-7ffff7ffa000 r--p 00000000 ... [vvar] 7ffff7ffa000-7ffff7ffc000 r-xp 00000000 ... [vdso] 7ffff7ffc000-7ffff7ffd000 r--p 00027000 ... /lib/x86_64-linux-gnu/ld-2.27.so 7ffff7ffd000-7ffff7ffe000 rw-p 00028000 ... /lib/x86_64-linux-gnu/ld-2.27.so 7ffff7ffe000-7ffff8020000 rw-p 00000000 ... [heap] 7ffffffde000-7ffffffff000 rw-p 00000000 ... [stack] The solution is to move brk out of mmap and into ELF_ET_DYN_BASE since nothing is there in the direct loader case (and ET_EXEC is still far away at 0x400000). Anything that ran before should still work (i.e. the ultimately-launched binary already had the brk very far from its text, so this should be no different from a COMPAT_BRK standpoint). The only risk I see here is that if someone started to suddenly depend on the entire memory space lower than the mmap region being available when launching binaries via a direct loader execs which seems highly unlikely, I'd hope: this would mean a binary would _not_ work when exec()ed normally. (Note that this is only done under CONFIG_ARCH_HAS_ELF_RANDOMIZATION when randomization is turned on.) Link: http://lkml.kernel.org/r/20190422225727.GA21011@beast Link: https://lkml.kernel.org/r/CAGXu5jJ5sj3emOT2QPxQkNQk0qbU6zEfu9=Omfhx_p0nCKPSjA@mail.gmail.com Fixes: eab09532 ("binfmt_elf: use ELF_ET_DYN_BASE only for PIE") Signed-off-by:
Ali Saidi <alisaidi@amazon.com> Cc: Ali Saidi <alisaidi@amazon.com> Cc: Guenter Roeck <linux@roeck-us.net> Cc: Michal Hocko <mhocko@suse.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jann Horn <jannh@google.com> Signed-off-by:
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Sabrina Dubroca authored
BugLink: https://bugs.launchpad.net/bugs/1881356 commit afe49de4 upstream. Commit 15e66807 ("ipv6: reorder icmpv6_init() and ip6_mr_init()") moved the cleanup label for ipmr_fail, but should have changed the contents of the cleanup labels as well. Now we can end up cleaning up icmpv6 even though it hasn't been initialized (jump to icmp_fail or ipmr_fail). Simply undo things in the reverse order of their initialization. Example of panic (triggered by faking a failure of icmpv6_init): kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN PTI [...] RIP: 0010:__list_del_entry_valid+0x79/0x160 [...] Call Trace: ? lock_release+0x8a0/0x8a0 unregister_pernet_operations+0xd4/0x560 ? ops_free_list+0x480/0x480 ? down_write+0x91/0x130 ? unregister_pernet_subsys+0x15/0x30 ? down_read+0x1b0/0x1b0 ? up_read+0x110/0x110 ? kmem_cache_create_usercopy+0x1b4/0x240 unregister_pernet_subsys+0x1d/0x30 icmpv6_cleanup+0x1d/0x30 inet6_init+0x1b5/0x23f Fixes: 15e66807 ("ipv6: reorder icmpv6_init() and ip6_mr_init()") Signed-off-by:
Sabrina Dubroca <sd@queasysnail.net> Signed-off-by:
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Govindarajulu Varadarajan authored
BugLink: https://bugs.launchpad.net/bugs/1881356 commit 56f77227 upstream. In failure path, we overwrite err to what vnic_rq_disable() returns. In case it returns 0, enic_open() returns success in case of error. Reported-by:
Govindarajulu Varadarajan <gvaradar@cisco.com> Signed-off-by:
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Eric Dumazet authored
BugLink: https://bugs.launchpad.net/bugs/1881356 [ Upstream commit 8738c85c ] If choke_init() could not allocate q->tab, we would crash later in choke_reset(). BUG: KASAN: null-ptr-deref in memset include/linux/string.h:366 [inline] BUG: KASAN: null-ptr-deref in choke_reset+0x208/0x340 net/sched/sch_choke.c:326 Write of size 8 at addr 0000000000000000 by task syz-executor822/7022 CPU: 1 PID: 7022 Comm: syz-executor822 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 __kasan_report.cold+0x5/0x4d mm/kasan/report.c:515 kasan_report+0x33/0x50 mm/kasan/common.c:625 check_memory_region_inline mm/kasan/generic.c:187 [inline] check_memory_region+0x141/0x190 mm/kasan/generic.c:193 memset+0x20/0x40 mm/kasan/common.c:85 memset include/linux/string.h:366 [inline] choke_reset+0x208/0x340 net/sched/sch_choke.c:326 qdisc_reset+0x6b/0x520 net/sched/sch_generic.c:910 dev_deactivate_queue.constprop.0+0x13c/0x240 net/sched/sch_generic.c:1138 netdev_for_each_tx_queue include/linux/netdevice.h:2197 [inline] dev_deactivate_many+0xe2/0xba0 net/sched/sch_generic.c:1195 dev_deactivate+0xf8/0x1c0 net/sched/sch_generic.c:1233 qdisc_graft+0xd25/0x1120 net/sched/sch_api.c:1051 tc_modify_qdisc+0xbab/0x1a00 net/sched/sch_api.c:1670 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5454 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2469 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6bf/0x7e0 net/socket.c:2362 ___sys_sendmsg+0x100/0x170 net/socket.c:2416 __sys_sendmsg+0xec/0x1b0 net/socket.c:2449 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 Fixes: 77e62da6 ("sch_choke: drop all packets in queue during reset") Signed-off-by:
Eric Dumazet <edumazet@google.com> Reported-by:
syzbot <syzkaller@googlegroups.com> Cc: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by:
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Eric Dumazet authored
BugLink: https://bugs.launchpad.net/bugs/1881356 [ Upstream commit df4953e4 ] syzbot managed to set up sfq so that q->scaled_quantum was zero, triggering an infinite loop in sfq_dequeue() More generally, we must only accept quantum between 1 and 2^18 - 7, meaning scaled_quantum must be in [1, 0x7FFF] range. Otherwise, we also could have a loop in sfq_dequeue() if scaled_quantum happens to be 0x8000, since slot->allot could indefinitely switch between 0 and 0x8000. Fixes: eeaeb068 ("sch_sfq: allow big packets and be fair") Signed-off-by:
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Tariq Toukan authored
BugLink: https://bugs.launchpad.net/bugs/1881356 [ Upstream commit 40e47307 ] When ENOSPC is set the idx is still valid and gets set to the global MLX4_SINK_COUNTER_INDEX. However gcc's static analysis cannot tell that ENOSPC is impossible from mlx4_cmd_imm() and gives this warning: drivers/net/ethernet/mellanox/mlx4/main.c:2552:28: warning: 'idx' may be used uninitialized in this function [-Wmaybe-uninitialized] 2552 | priv->def_counter[port] = idx; Also, when ENOSPC is returned mlx4_allocate_default_counters should not fail. Fixes: 6de5f7f6 ("net/mlx4_core: Allocate default counter per port") Signed-off-by:
Jason Gunthorpe <jgg@mellanox.com> Signed-off-by:
Tariq Toukan <tariqt@mellanox.com> Signed-off-by:
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Julia Lawall authored
BugLink: https://bugs.launchpad.net/bugs/1881356 [ Upstream commit 86530837 ] In this code, it appears that phyter_clocks is a list head, based on the previous list_for_each, and that clock->list is intended to be a list element, given that it has just been initialized in dp83640_clock_init. Accordingly, switch the arguments to list_add_tail, which takes the list head as the second argument. Fixes: cb646e2b ("ptp: Added a clock driver for the National Semiconductor PHYTER.") Signed-off-by:
Julia Lawall <Julia.Lawall@inria.fr> Signed-off-by:
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Greg Kroah-Hartman authored
BugLink: https://bugs.launchpad.net/bugs/1881356 This reverts commit 0d1951fa23ba0d35a4c5498ff28d1c5206d6fcdd which was commit d5c3d846 upstream. Guillaume reports that this patch breaks booting on at91-sama5d4_xplained, so revert it for now. Reported-by:
"kernelci.org bot" <bot@kernelci.org> Reported-by:
Guillaume Tucker <guillaume.tucker@collabora.com> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: David S. Miller <davem@davemloft.net> Signed-off-by:
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Matt Jolly authored
BugLink: https://bugs.launchpad.net/bugs/1881356 commit 78d6de3c upstream. Add support for Dell Wireless 5816e to drivers/usb/serial/qcserial.c Signed-off-by:
Matt Jolly <Kangie@footclan.ninja> Cc: stable <stable@vger.kernel.org> Signed-off-by:
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Paolo Abeni authored
The cipso and calipso code can set the MLS_CAT attribute on successful parsing, even if the corresponding catmap has not been allocated, as per current configuration and external input. Later, selinux code tries to access the catmap if the MLS_CAT flag is present via netlbl_catmap_getlong(). That may cause null ptr dereference while processing incoming network traffic. Address the issue setting the MLS_CAT flag only if the catmap is really allocated. Additionally let netlbl_catmap_getlong() cope with NULL catmap. Reported-by:
Matthew Sheets <matthew.sheets@gd-ms.com> Fixes: 4b8feff2 ("netlabel: fix the horribly broken catmap functions") Fixes: ceba1832 ("calipso: Set the calipso socket label to match the secattr.") Signed-off-by:
Paolo Abeni <pabeni@redhat.com> Acked-by:
Paul Moore <paul@paul-moore.com> Signed-off-by:
Thadeu Lima de Souza Cascardo <cascardo@canonical.com> Acked-by:
Stefan Bader <stefan.bader@canonical.com> Acked-by:
Andrea Righi <andrea.righi@canonical.com> Signed-off-by:
Khalid Elmously <khalid.elmously@canonical.com>
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Kyungtae Kim authored
FuzzUSB (a variant of syzkaller) found an illegal array access using an incorrect index while binding a gadget with UDC. Reference: https://www.spinics.net/lists/linux-usb/msg194331.html This bug occurs when a size variable used for a buffer is misused to access its strcpy-ed buffer. Given a buffer along with its size variable (taken from user input), from which, a new buffer is created using kstrdup(). Due to the original buffer containing 0 value in the middle, the size of the kstrdup-ed buffer becomes smaller than that of the original. So accessing the kstrdup-ed buffer with the same size variable triggers memory access violation. The fix makes sure no zero value in the buffer, by comparing the strlen() of the orignal buffer with the size variable, so that the access to the kstrdup-ed buffer is safe. BUG: KASAN: slab-out-of-bounds in gadget_dev_desc_UDC_store+0x1ba/0x200 drivers/usb/gadget/configfs.c:266 Read of size 1 at addr ffff88806a55dd7e by task syz-executor.0/17208 CPU: 2 PID: 17208 Comm: syz-executor.0 Not tainted 5.6.8 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xce/0x128 lib/dump_stack.c:118 print_address_description.constprop.4+0x21/0x3c0 mm/kasan/report.c:374 __kasan_report+0x131/0x1b0 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:641 __asan_report_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:132 gadget_dev_desc_UDC_store+0x1ba/0x200 drivers/usb/gadget/configfs.c:266 flush_write_buffer fs/configfs/file.c:251 [inline] configfs_write_file+0x2f1/0x4c0 fs/configfs/file.c:283 __vfs_write+0x85/0x110 fs/read_write.c:494 vfs_write+0x1cd/0x510 fs/read_write.c:558 ksys_write+0x18a/0x220 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:620 do_syscall_64+0x9e/0x510 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe Signed-off-by:
Kyungtae Kim <kt0755@gmail.com> Reported-and-tested-by:
Kleber Souza <kleber.souza@canonical.com> Signed-off-by:
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Jan Kara authored
BugLink: https://bugs.launchpad.net/bugs/1880213 Fix a debug-only build error in ext2/xattr.c: When building without extra debugging, (and with another patch that uses no_printk() instead of <empty> for the ext2-xattr debug-print macros, this build error happens: ../fs/ext2/xattr.c: In function ‘ext2_xattr_cache_insert’: ../fs/ext2/xattr.c:869:18: error: ‘ext2_xattr_cache’ undeclared (first use in this function); did you mean ‘ext2_xattr_list’? atomic_read(&ext2_xattr_cache->c_entry_count)); Fix the problem by removing cached entry count from the debug message since otherwise we'd have to export the mbcache structure just for that. Fixes: be0726d3 ("ext2: convert to mbcache2") Reported-by:
Randy Dunlap <rdunlap@infradead.org> Signed-off-by:
Kamal Mostafa <kamal@canonical.com> Signed-off-by:
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Daniel Borkmann authored
BugLink: https://bugs.launchpad.net/bugs/1879752 After commit 636c2628 ("net: skbuff: Remove errornous length validation in skb_vlan_pop()") mentioned test case stopped working, throwing a -12 (ENOMEM) return code. The issue however is not due to 636c2628, but rather due to a buggy test case that got uncovered from the change in behaviour in 636c2628. The data_size of that test case for the skb was set to 1. In the bpf_fill_ld_abs_vlan_push_pop() handler bpf insns are generated that loop with: reading skb data, pushing 68 tags, reading skb data, popping 68 tags, reading skb data, etc, in order to force a skb expansion and thus trigger that JITs recache skb->data. Problem is that initial data_size is too small. While before 636c2628, the test silently bailed out due to the skb->len < VLAN_ETH_HLEN check with returning 0, and now throwing an error from failing skb_ensure_writable(). Set at least minimum of ETH_HLEN as an initial length so that on first push of data, equivalent pop will succeed. Fixes: 4d9c5c53 ("test_bpf: add bpf_skb_vlan_push/pop() tests") Signed-off-by:
Daniel Borkmann <daniel@iogearbox.net> Acked-by:
Alexei Starovoitov <ast@kernel.org> Signed-off-by:
Po-Hsu Lin <po-hsu.lin@canonical.com> Acked-by:
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Marcelo Henrique Cerri authored
Ignore: yes Signed-off-by:Marcelo Henrique Cerri <marcelo.cerri@canonical.com>
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- 03 Jun, 2020 7 commits
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Kleber Sacilotto de Souza authored
Signed-off-by: -
Josh Poimboeuf authored
Make the docs match the code. Signed-off-by:
Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by:
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Mark Gross authored
Add documentation for the SRBDS vulnerability and its mitigation. [ bp: Massage. jpoimboe: sysfs table strings. ] Signed-off-by:
Mark Gross <mgross@linux.intel.com> Signed-off-by:
Tony Luck <tony.luck@intel.com> Reviewed-by:
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Mark Gross authored
SRBDS is an MDS-like speculative side channel that can leak bits from the random number generator (RNG) across cores and threads. New microcode serializes the processor access during the execution of RDRAND and RDSEED. This ensures that the shared buffer is overwritten before it is released for reuse. While it is present on all affected CPU models, the microcode mitigation is not needed on models that enumerate ARCH_CAPABILITIES[MDS_NO] in the cases where TSX is not supported or has been disabled with TSX_CTRL. The mitigation is activated by default on affected processors and it increases latency for RDRAND and RDSEED instructions. Among other effects this will reduce throughput from /dev/urandom. * Enable administrator to configure the mitigation off when desired using either mitigations=off or srbds=off. * Export vulnerability status via sysfs * Rename file-scoped macros to apply for non-whitelist table initializations. [ bp: Massage, - s/VULNBL_INTEL_STEPPING/VULNBL_INTEL_STEPPINGS/g, - do not read arch cap MSR a second time in tsx_fused_off() - just pass it in, - flip check in cpu_set_bug_bits() to save an indentation level, - reflow comments. jpoimboe: s/Mitigated/Mitigation/ in user-visible strings tglx: Dropped the fused off magic for now ] Signed-off-by:
Pawan Gupta <pawan.kumar.gupta@linux.intel.com> Reviewed-by:
Neelima Krishnan <neelima.krishnan@intel.com> CVE-2020-0543 Signed-off-by:
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Mark Gross authored
To make cpu_matches() reusable for other matching tables, have it take a pointer to a x86_cpu_id table as an argument. [ bp: Flip arguments order. ] Signed-off-by:
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Mark Gross authored
Intel uses the same family/model for several CPUs. Sometimes the stepping must be checked to tell them apart. On x86 there can be at most 16 steppings. Add a steppings bitmask to x86_cpu_id and a X86_MATCH_VENDOR_FAMILY_MODEL_STEPPING_FEATURE macro and support for matching against family/model/stepping. [ bp: Massage. tglx: Lightweight variant for backporting ] Signed-off-by:
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Kleber Sacilotto de Souza authored
Ignore: yes Signed-off-by:
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- 29 May, 2020 1 commit
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Khalid Elmously authored
Signed-off-by:
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