This bug was fixed in the package linux - 3.13.0-153.203 --------------- linux (3.13.0-153.203) trusty; urgency=medium
* linux: 3.13.0-153.203 -proposed tracker (LP: #1776819) * CVE-2018-3665 (x86) - x86/fpu: Print out whether we are doing lazy/eager FPU context switches - x86/fpu: Default eagerfpu=on on all CPUs - x86/fpu: Fix math emulation in eager fpu mode linux (3.13.0-152.202) trusty; urgency=medium * linux: 3.13.0-152.202 -proposed tracker (LP: #1776350) * CVE-2017-15265 - ALSA: seq: Fix use-after-free at creating a port * register on binfmt_misc may overflow and crash the system (LP: #1775856) - fs/binfmt_misc.c: do not allow offset overflow * CVE-2018-1130 - dccp: check sk for closed state in dccp_sendmsg() - ipv6: dccp: add missing bind_conflict to dccp_ipv6_mapped * add_key04 in LTP syscall test cause kernel oops (NULL pointer dereference) with T kernel (LP: #1775316) // CVE-2017-12193 - assoc_array: Fix a buggy node-splitting case * CVE-2017-12154 - kvm: nVMX: Don't allow L2 to access the hardware CR8 * CVE-2018-7757 - scsi: libsas: fix memory leak in sas_smp_get_phy_events() * CVE-2018-6927 - futex: Prevent overflow by strengthen input validation * FS-Cache: Assertion failed: FS-Cache: 6 == 5 is false (LP: #1774336) - SAUCE: CacheFiles: fix a read_waiter/read_copier race * CVE-2018-5803 - sctp: verify size of a new chunk in _sctp_make_chunk() * WARNING: CPU: 28 PID: 34085 at /build/linux- 90Gc2C/linux-3.13.0/net/core/dev.c:1433 dev_disable_lro+0x87/0x90() (LP: #1771480) - net/core: generic support for disabling netdev features down stack - SAUCE: Backport helper function netdev_upper_get_next_dev_rcu * CVE-2018-7755 - SAUCE: floppy: Do not copy a kernel pointer to user memory in FDGETPRM ioctl * CVE-2018-5750 - ACPI: sbshc: remove raw pointer from printk() message -- Stefan Bader <stefan.ba...@canonical.com> Thu, 14 Jun 2018 07:00:42 +0200 ** Changed in: linux (Ubuntu Bionic) Status: Fix Committed => Fix Released -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1775856 Title: register on binfmt_misc may overflow and crash the system Status in linux package in Ubuntu: Incomplete Status in linux source package in Precise: Incomplete Status in linux source package in Trusty: Fix Released Status in linux source package in Xenial: Fix Released Status in linux source package in Artful: Fix Released Status in linux source package in Bionic: Fix Released Status in linux source package in Cosmic: Incomplete Bug description: [Impact] When registering a new binfmt_misc handler, it is possible to overflow the offset to get a negative value, which might crash the system, or possibly leak kernel data. Here is a crash log when 2500000000 was used as an offset: BUG: unable to handle kernel paging request at ffff989cfd6edca0 IP: load_misc_binary+0x22b/0x470 [binfmt_misc] PGD 1ef3e067 P4D 1ef3e067 PUD 0 Oops: 0000 [#1] SMP NOPTI Modules linked in: binfmt_misc kvm_intel ppdev kvm irqbypass joydev input_leds serio_raw mac_hid parport_pc qemu_fw_cfg parpy CPU: 0 PID: 2499 Comm: bash Not tainted 4.15.0-22-generic #24-Ubuntu Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.1-1 04/01/2014 RIP: 0010:load_misc_binary+0x22b/0x470 [binfmt_misc] Call Trace: search_binary_handler+0x97/0x1d0 do_execveat_common.isra.34+0x667/0x810 SyS_execve+0x31/0x40 do_syscall_64+0x73/0x130 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 Use kstrtoint instead of simple_strtoul. It will work as the code already set the delimiter byte to '\0' and we only do it when the field is not empty. [Test Case] Tested with offsets -1, 2500000000, UINT_MAX and INT_MAX. Also tested with examples documented at Documentation/admin-guide/binfmt-misc.rst and other registrations from packages on Ubuntu. [Regression] Fail to register valid types. This was tested with a bionic kernel with the patch. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1775856/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp