- May 11, 2019
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Ben Hutchings authored
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Matteo Croce authored
commit 00206a69 upstream. Since commit ad67b74d ("printk: hash addresses printed with %p"), at boot "____ptrval____" is printed instead of actual addresses: percpu: Embedded 38 pages/cpu @(____ptrval____) s124376 r0 d31272 u524288 Instead of changing the print to "%px", and leaking kernel addresses, just remove the print completely, cfr. e.g. commit 071929db ("arm64: Stop printing the virtual memory layout"). Signed-off-by:
Matteo Croce <mcroce@redhat.com> Signed-off-by:
Dennis Zhou <dennis@kernel.org> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> [bwh: Backported to 3.16: adjust context] Signed-off-by:
Ben Hutchings <ben@decadent.org.uk>
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Ben Hutchings authored
The timer_stats facility should filter and translate PIDs if opened from a non-initial PID namespace, to avoid leaking information about the wider system. It should also not show kernel virtual addresses. Unfortunately it has now been removed upstream (as redundant) instead of being fixed. For stable, fix the leak by restricting access to root only. A similar change was already made for the /proc/timer_list file. Signed-off-by: -
David Herrmann authored
commit 7b558513 upstream. This changes the fork(2) syscall to record the process start_time after initializing the basic task structure but still before making the new process visible to user-space. Technically, we could record the start_time anytime during fork(2). But this might lead to scenarios where a start_time is recorded long before a process becomes visible to user-space. For instance, with userfaultfd(2) and TLS, user-space can delay the execution of fork(2) for an indefinite amount of time (and will, if this causes network access, or similar). By recording the start_time late, it much closer reflects the point in time where the process becomes live and can be observed by other processes. Lastly, this makes it much harder for user-space to predict and control the start_time they get assigned. Previously, user-space could fork a process and stall it in copy_thread_tls() before its pid is allocated, but after its start_time is recorded. This can be misused to later-on cycle through PIDs and resume the stalled fork(2) yielding a process that has the same pid and start_time as a process that existed before. This can be used to circumvent security systems that identify processes by their pid+start_time combination. Even though user-space was always aware that start_time recording is flaky (but several projects are known to still rely on start_time-based identification), changing the start_time to be recorded late will help mitigate existing attacks and make it much harder for user-space to control the start_time a process gets assigned. Reported-by:
Jann Horn <jannh@google.com> Signed-off-by:
Tom Gundersen <teg@jklm.no> Signed-off-by:
David Herrmann <dh.herrmann@gmail.com> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org> [bwh: Backported to 3.16: start_time initialisation code is different] Signed-off-by:
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Joerg Roedel authored
The stable backport of upstream commit 904e14fb KVM: VMX: make MSR bitmaps per-VCPU has a bug in vmx_msr_bitmap_mode(). It enables the x2apic MSR-bitmap when the kernel emulates x2apic for the guest in software. The upstream version of the commit checkes whether the hardware has virtualization enabled for x2apic emulation. Since KVM emulates x2apic for guests even when the host does not support x2apic in hardware, this causes the intercept of at least the X2APIC_TASKPRI MSR to be disabled on machines not supporting that MSR. The result is undefined behavior, on some machines (Intel Westmere based) it causes a crash of the guest kernel when it tries to access that MSR. Change the check in vmx_msr_bitmap_mode() to match the upstream code. This fixes the guest crashes observed with stable kernels starting with v4.4.168 through v4.4.175. Signed-off-by:
Joerg Roedel <jroedel@suse.de> Signed-off-by:
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Eric Dumazet authored
commit caa41527 upstream. nh_exceptions is effectively used under rcu, but lacks proper barriers. Between kzalloc() and setting of nh->nh_exceptions(), we need a proper memory barrier. Signed-off-by:
Eric Dumazet <edumazet@google.com> Fixes: 4895c771 ("ipv4: Add FIB nexthop exceptions.") Signed-off-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
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Ben Hutchings authored
In this version of the driver, VNIs are consistently kept in host order. However vxlan_fdb_create() erroneously declares its vni parameter as __be32, which sparse warns about. Change it to __u32. This was resolved upstream by commit 54bfd872 "vxlan: keep flags and vni in network byte order". Signed-off-by:
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Nick Krause authored
commit 9f5b8b4f upstream. Remove unused definition which cause the following warnings drivers/spi/spi-omap-100k.c:73:0: warning: "WRITE" redefined [enabled by default] include/linux/fs.h:193:0: note: this is the location of the previous definition drivers/spi/spi-omap-100k.c:74:0: warning: "READ" redefined [enabled by default] include/linux/fs.h:192:0: note: this is the location of the previous definition Signed-off-by:
Nick Krause <xerofoiffy@gmail.com> Acked-by:
Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by:
Mark Brown <broonie@linaro.org> Signed-off-by:
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Amit Klein authored
Commit 355b9855 ("netns: provide pure entropy for net_hash_mix()") makes net_hash_mix() return a true 32 bits of entropy. When used in the IP ID generation algorithm, this has the effect of extending the IP ID generation key from 32 bits to 64 bits. However, net_hash_mix() is only used for IP ID generation starting with kernel version 4.1. Therefore, earlier kernels remain with 32-bit key no matter what the net_hash_mix() return value is. This change addresses the issue by explicitly extending the key to 64 bits for kernels older than 4.1. Signed-off-by:
Amit Klein <aksecurity@gmail.com> Signed-off-by:
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Arend Van Spriel authored
commit 4835f37e upstream. Assure the event data buffer is long enough to hold the array of netinfo items and that SSID length does not exceed the maximum of 32 characters as per 802.11 spec. Reviewed-by:
Hante Meuleman <hante.meuleman@broadcom.com> Reviewed-by:
Pieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com> Reviewed-by:
Franky Lin <franky.lin@broadcom.com> Signed-off-by:
Arend van Spriel <arend.vanspriel@broadcom.com> Signed-off-by:
Kalle Valo <kvalo@codeaurora.org> [bwh: Backported to 3.16: - Move the assignment to "data" along with the assignment to "netinfo_start" that depends on it - Adjust filename, context, indentation] Signed-off-by:
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Ben Hutchings authored
This reverts commit 9657f3ab, which was similar to commit 1b5e2423 upstream. The function fixed upstream doesn't exist in 3.16 and the similar bug that does exist here needs a different fix. Signed-off-by:
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- May 02, 2019
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Ben Hutchings authored
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Greg Kroah-Hartman authored
commit c7084edc upstream. The n_r3964 line discipline driver was written in a different time, when SMP machines were rare, and users were trusted to do the right thing. Since then, the world has moved on but not this code, it has stayed rooted in the past with its lovely hand-crafted list structures and loads of "interesting" race conditions all over the place. After attempting to clean up most of the issues, I just gave up and am now marking the driver as BROKEN so that hopefully someone who has this hardware will show up out of the woodwork (I know you are out there!) and will help with debugging a raft of changes that I had laying around for the code, but was too afraid to commit as odds are they would break things. Many thanks to Jann and Linus for pointing out the initial problems in this codebase, as well as many reviews of my attempts to fix the issues. It was a case of whack-a-mole, and as you can see, the mole won. Reported-by:
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John Johansen authored
commit 34c426ac upstream. Commit 9f834ec1 ("binfmt_elf: switch to new creds when switching to new mm") changed when the creds are installed by the binfmt_elf handler. This affects which creds are used to mmap the executable into the address space. Which can have an affect on apparmor policy. Add a flag to apparmor at /sys/kernel/security/apparmor/features/domain/fix_binfmt_elf_mmap to make it possible to detect this semantic change so that the userspace tools and the regression test suite can correctly deal with the change. BugLink: http://bugs.launchpad.net/bugs/1630069 Signed-off-by:
John Johansen <john.johansen@canonical.com> Signed-off-by:
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Linus Torvalds authored
commit 9f834ec1 upstream. We used to delay switching to the new credentials until after we had mapped the executable (and possible elf interpreter). That was kind of odd to begin with, since the new executable will actually then _run_ with the new creds, but whatever. The bigger problem was that we also want to make sure that we turn off prof events and tracing before we start mapping the new executable state. So while this is a cleanup, it's also a fix for a possible information leak. Reported-by:
Robert Święcki <robert@swiecki.net> Tested-by:
Peter Zijlstra <peterz@infradead.org> Acked-by:
David Howells <dhowells@redhat.com> Acked-by:
Oleg Nesterov <oleg@redhat.com> Acked-by:
Andy Lutomirski <luto@amacapital.net> Acked-by:
Eric W. Biederman <ebiederm@xmission.com> Cc: Willy Tarreau <w@1wt.eu> Cc: Kees Cook <keescook@chromium.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by:
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Ben Hutchings authored
Commit ea08dc51 "fs/binfmt_elf.c: fix bug in loading of PIE binaries", which was a backport of commit a87938b2 upstream, added a new failure path to load_elf_binary(). Before commit 19d860a1 "handle suicide on late failure exits in execve() in search_binary_handler()", load_elf_binary() wass responsible for sending a fatal signal to the task in case of an error after flushing the old executable. Add that to the new failure path. Signed-off-by:
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Arend van Spriel authored
commit a4176ec3 upstream. For USB there is no separate channel being used to pass events from firmware to the host driver and as such are passed over the data path. In order to detect mock event messages an additional check is needed on event subtype. This check is added conditionally using unlikely() keyword. Reviewed-by:
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Arend van Spriel authored
commit 9c349892 upstream. Move event handling out of brcmf_netif_rx() avoiding the need to pass a flag. This flag is only ever true for USB hosts as other interface use separate brcmf_rx_event() function. Reviewed-by:
Arend van Spriel <arend@broadcom.com> Signed-off-by:
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Gavin Li authored
commit 8e290cec upstream. brcmf_sdio_fromevntchan() was being called on the the data frame rather than the software header, causing some frames to be mischaracterized as on the event channel rather than the data channel. This fixes a major performance regression (due to dropped packets). With this patch the download speed jumped from 1Mbit/s back up to 40MBit/s due to the sheer amount of packets being incorrectly processed. Fixes: c56caa9d ("brcmfmac: screening firmware event packet") Signed-off-by:
Gavin Li <git@thegavinli.com> Acked-by:
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Franky Lin authored
commit c56caa9d upstream. Firmware uses asynchronized events as a communication method to the host. The event packets are marked as ETH_P_LINK_CTL protocol type. For SDIO and PCIe bus, this kind of packets are delivered through virtual event channel not data channel. This patch adds a screening logic to make sure the event handler only processes the events coming from the correct channel. Reviewed-by:
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Arend van Spriel authored
commit 796cfb65 upstream. Avoid spreading the ifidx in the driver, but have it return the struct brcmf_if instance. Reviewed-by:
Hante Meuleman <meuleman@broadcom.com> Reviewed-by:
Franky (Zhenhui) Lin <frankyl@broadcom.com> Reviewed-by:
Pieter-Paul Giesberts <pieterpg@broadcom.com> Signed-off-by:
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Arend van Spriel authored
commit 75effb03 upstream. In rx path the firmware provide an interface index which is used to map to a struct brcmf_if instance. However, this involves some trick that is done in two places. This is changed by having driver core providing brcmf_get_ifp() function. Reviewed-by:
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Arend van Spriel authored
commit 1b5e2423 upstream. The SSID length as received from firmware should not exceed IEEE80211_MAX_SSID_LEN as that would result in heap overflow. Reviewed-by:
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Peter Zijlstra authored
commit 79c9ce57 upstream. Jann reported that the ptrace_may_access() check in find_lively_task_by_vpid() is racy against exec(). Specifically: perf_event_open() execve() ptrace_may_access() commit_creds() ... if (get_dumpable() != SUID_DUMP_USER) perf_event_exit_task(); perf_install_in_context() would result in installing a counter across the creds boundary. Fix this by wrapping lots of perf_event_open() in cred_guard_mutex. This should be fine as perf_event_exit_task() is already called with cred_guard_mutex held, so all perf locks already nest inside it. Reported-by:
Ingo Molnar <mingo@kernel.org> [bwh: Backported to 3.16: - Update another failure path in perf_event_open() - Adjust context] Signed-off-by:
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Andrea Arcangeli authored
commit 04f5866e upstream. The core dumping code has always run without holding the mmap_sem for writing, despite that is the only way to ensure that the entire vma layout will not change from under it. Only using some signal serialization on the processes belonging to the mm is not nearly enough. This was pointed out earlier. For example in Hugh's post from Jul 2017: https://lkml.kernel.org/r/alpine.LSU.2.11.1707191716030.2055@eggly.anvils "Not strictly relevant here, but a related note: I was very surprised to discover, only quite recently, how handle_mm_fault() may be called without down_read(mmap_sem) - when core dumping. That seems a misguided optimization to me, which would also be nice to correct" In particular because the growsdown and growsup can move the vm_start/vm_end the various loops the core dump does around the vma will not be consistent if page faults can happen concurrently. Pretty much all users calling mmget_not_zero()/get_task_mm() and then taking the mmap_sem had the potential to introduce unexpected side effects in the core dumping code. Adding mmap_sem for writing around the ->core_dump invocation is a viable long term fix, but it requires removing all copy user and page faults and to replace them with get_dump_page() for all binary formats which is not suitable as a short term fix. For the time being this solution manually covers the places that can confuse the core dump either by altering the vma layout or the vma flags while it runs. Once ->core_dump runs under mmap_sem for writing the function mmget_still_valid() can be dropped. Allowing mmap_sem protected sections to run in parallel with the coredump provides some minor parallelism advantage to the swapoff code (which seems to be safe enough by never mangling any vma field and can keep doing swapins in parallel to the core dumping) and to some other corner case. In order to facilitate the backporting I added "Fixes: 86039bd3" however the side effect of this same race condition in /proc/pid/mem should be reproducible since before 2.6.12-rc2 so I couldn't add any other "Fixes:" because there's no hash beyond the git genesis commit. Because find_extend_vma() is the only location outside of the process context that could modify the "mm" structures under mmap_sem for reading, by adding the mmget_still_valid() check to it, all other cases that take the mmap_sem for reading don't need the new check after mmget_not_zero()/get_task_mm(). The expand_stack() in page fault context also doesn't need the new check, because all tasks under core dumping are frozen. Link: http://lkml.kernel.org/r/20190325224949.11068-1-aarcange@redhat.com Fixes: 86039bd3 ("userfaultfd: add new syscall to provide memory externalization") Signed-off-by:
Andrea Arcangeli <aarcange@redhat.com> Reported-by:
Peter Xu <peterx@redhat.com> Reviewed-by:
Mike Rapoport <rppt@linux.ibm.com> Reviewed-by:
Jason Gunthorpe <jgg@mellanox.com> Acked-by:
Michal Hocko <mhocko@suse.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
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Alex Williamson authored
commit 49285593 upstream. Memory backed DMA mappings are accounted against a user's locked memory limit, including multiple mappings of the same memory. This accounting bounds the number of such mappings that a user can create. However, DMA mappings that are not backed by memory, such as DMA mappings of device MMIO via mmaps, do not make use of page pinning and therefore do not count against the user's locked memory limit. These mappings still consume memory, but the memory is not well associated to the process for the purpose of oom killing a task. To add bounding on this use case, we introduce a limit to the total number of concurrent DMA mappings that a user is allowed to create. This limit is exposed as a tunable module option where the default value of 64K is expected to be well in excess of any reasonable use case (a large virtual machine configuration would typically only make use of tens of concurrent mappings). This fixes CVE-2019-3882. Reviewed-by:
Eric Auger <eric.auger@redhat.com> Tested-by:
Cornelia Huck <cohuck@redhat.com> Signed-off-by:
Alex Williamson <alex.williamson@redhat.com> [bwh: Backported to 3.16: - Add the out_unlock label in vfio_dma_do_map() - Adjust context] Signed-off-by:
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Marcel Holtmann authored
commit af3d5d1c upstream. When doing option parsing for standard type values of 1, 2 or 4 octets, the value is converted directly into a variable instead of a pointer. To avoid being tricked into being a pointer, check that for these option types that sizes actually match. In L2CAP every option is fixed size and thus it is prudent anyway to ensure that the remote side sends us the right option size along with option paramters. If the option size is not matching the option type, then that option is silently ignored. It is a protocol violation and instead of trying to give the remote attacker any further hints just pretend that option is not present and proceed with the default values. Implementation following the specification and its qualification procedures will always use the correct size and thus not being impacted here. To keep the code readable and consistent accross all options, a few cosmetic changes were also required. Signed-off-by:
Marcel Holtmann <marcel@holtmann.org> Reviewed-by:
Johan Hedberg <johan.hedberg@intel.com> [bwh: Backported to 3.16: adjust context] Signed-off-by:
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Marcel Holtmann authored
commit 7c9cbd0b upstream. The function l2cap_get_conf_opt will return L2CAP_CONF_OPT_SIZE + opt->len as length value. The opt->len however is in control over the remote user and can be used by an attacker to gain access beyond the bounds of the actual packet. To prevent any potential leak of heap memory, it is enough to check that the resulting len calculation after calling l2cap_get_conf_opt is not below zero. A well formed packet will always return >= 0 here and will end with the length value being zero after the last option has been parsed. In case of malformed packets messing with the opt->len field the length value will become negative. If that is the case, then just abort and ignore the option. In case an attacker uses a too short opt->len value, then garbage will be parsed, but that is protected by the unknown option handling and also the option parameter size checks. Signed-off-by:
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Matthias Schwarzott authored
commit 910b0797 upstream. Fix bug by moving the i2c_unregister_device calls after deregistration of dvb frontend. The new style i2c drivers already destroys the frontend object at i2c_unregister_device time. When the dvb frontend is unregistered afterwards it leads to this oops: [ 6058.866459] BUG: unable to handle kernel NULL pointer dereference at 00000000000001f8 [ 6058.866578] IP: dvb_frontend_stop+0x30/0xd0 [dvb_core] [ 6058.866644] PGD 0 [ 6058.866646] P4D 0 [ 6058.866726] Oops: 0000 [#1] SMP [ 6058.866768] Modules linked in: rc_pinnacle_pctv_hd(O) em28xx_rc(O) si2157(O) si2168(O) em28xx_dvb(O) em28xx(O) si2165(O) a8293(O) tda10071(O) tea5767(O) tuner(O) cx23885(O) tda18271(O) videobuf2_dvb(O) videobuf2_dma_sg(O) m88ds3103(O) tveeprom(O) cx2341x(O) v4l2_common(O) dvb_core(O) rc_core(O) videobuf2_memops(O) videobuf2_v4l2(O) videobuf2_core(O) videodev(O) media(O) bluetooth ecdh_generic ums_realtek uas rtl8192cu rtl_usb rtl8192c_common rtlwifi usb_storage snd_hda_codec_realtek snd_hda_codec_hdmi snd_hda_codec_generic i2c_mux snd_hda_intel snd_hda_codec snd_hwdep x86_pkg_temp_thermal snd_hda_core kvm_intel kvm irqbypass [last unloaded: videobuf2_memops] [ 6058.867497] CPU: 2 PID: 7349 Comm: kworker/2:0 Tainted: G W O 4.13.9-gentoo #1 [ 6058.867595] Hardware name: MEDION E2050 2391/H81H3-EM2, BIOS H81EM2W08.308 08/25/2014 [ 6058.867692] Workqueue: usb_hub_wq hub_event [ 6058.867746] task: ffff88011a15e040 task.stack: ffffc90003074000 [ 6058.867825] RIP: 0010:dvb_frontend_stop+0x30/0xd0 [dvb_core] [ 6058.867896] RSP: 0018:ffffc90003077b58 EFLAGS: 00010293 [ 6058.867964] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000010040001f [ 6058.868056] RDX: ffff88011a15e040 RSI: ffffea000464e400 RDI: ffff88001cbe3028 [ 6058.868150] RBP: ffffc90003077b68 R08: ffff880119390380 R09: 000000010040001f [ 6058.868241] R10: ffffc90003077b18 R11: 000000000001e200 R12: ffff88001cbe3028 [ 6058.868330] R13: ffff88001cbe68d0 R14: ffff8800cf734000 R15: ffff8800cf734098 [ 6058.868419] FS: 0000000000000000(0000) GS:ffff88011fb00000(0000) knlGS:0000000000000000 [ 6058.868511] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 6058.868578] CR2: 00000000000001f8 CR3: 00000001113c5000 CR4: 00000000001406e0 [ 6058.868662] Call Trace: [ 6058.868705] dvb_unregister_frontend+0x2a/0x80 [dvb_core] [ 6058.868774] em28xx_dvb_fini+0x132/0x220 [em28xx_dvb] [ 6058.868840] em28xx_close_extension+0x34/0x90 [em28xx] [ 6058.868902] em28xx_usb_disconnect+0x4e/0x70 [em28xx] [ 6058.868968] usb_unbind_interface+0x6d/0x260 [ 6058.869025] device_release_driver_internal+0x150/0x210 [ 6058.869094] device_release_driver+0xd/0x10 [ 6058.869150] bus_remove_device+0xe4/0x160 [ 6058.869204] device_del+0x1ce/0x2f0 [ 6058.869253] usb_disable_device+0x99/0x270 [ 6058.869306] usb_disconnect+0x8d/0x260 [ 6058.869359] hub_event+0x93d/0x1520 [ 6058.869408] ? dequeue_task_fair+0xae5/0xd20 [ 6058.869467] process_one_work+0x1d9/0x3e0 [ 6058.869522] worker_thread+0x43/0x3e0 [ 6058.869576] kthread+0x104/0x140 [ 6058.869602] ? trace_event_raw_event_workqueue_work+0x80/0x80 [ 6058.869640] ? kthread_create_on_node+0x40/0x40 [ 6058.869673] ret_from_fork+0x22/0x30 [ 6058.869698] Code: 54 49 89 fc 53 48 8b 9f 18 03 00 00 0f 1f 44 00 00 41 83 bc 24 04 05 00 00 02 74 0c 41 c7 84 24 04 05 00 00 01 00 00 00 0f ae f0 <48> 8b bb f8 01 00 00 48 85 ff 74 5c e8 df 40 f0 e0 48 8b 93 f8 [ 6058.869850] RIP: dvb_frontend_stop+0x30/0xd0 [dvb_core] RSP: ffffc90003077b58 [ 6058.869894] CR2: 00000000000001f8 [ 6058.875880] ---[ end trace 717eecf7193b3fc6 ]--- Signed-off-by:
Matthias Schwarzott <zzam@gentoo.org> Signed-off-by:
Mauro Carvalho Chehab <mchehab@s-opensource.com> [bwh: Backported to 3.16: adjust context] Signed-off-by:
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Shuah Khan authored
commit 6eb5e339 upstream. em28xx_dvb_resume() unregisters i2c tuner, i2c demod, and dvb. This erroneous cleanup results in i2c tuner, i2c demod, and dvb devices unregistered and removed during resume. This error is a result of merge conflict between two patches that went into 3.15. Signed-off-by:
Shuah Khan <shuah.kh@samsung.com> Reviewed-by:
Antti Palosaari <crope@iki.fi> Signed-off-by:
Mauro Carvalho Chehab <m.chehab@samsung.com> Signed-off-by:
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Eric W. Biederman authored
commit 2236d4d3 upstream. The 0day kernel test build report reported an oops: > > IP: put_pid+0x22/0x5c > PGD 19efa067 P4D 19efa067 PUD 0 > Oops: 0000 [#1] > CPU: 0 PID: 727 Comm: trinity Not tainted 4.16.0-rc2-00010-g98f929b #1 > RIP: 0010:put_pid+0x22/0x5c > RSP: 0018:ffff986719f73e48 EFLAGS: 00010202 > RAX: 00000006d765f710 RBX: ffff98671a4fa4d0 RCX: ffff986719f73d40 > RDX: 000000006f6e6125 RSI: 0000000000000000 RDI: ffffffffa01e6d21 > RBP: ffffffffa0955fe0 R08: 0000000000000020 R09: 0000000000000000 > R10: 0000000000000078 R11: ffff986719f73e76 R12: 0000000000001000 > R13: 00000000ffffffea R14: 0000000054000fb0 R15: 0000000000000000 > FS: 00000000028c2880(0000) GS:ffffffffa06ad000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000677846439 CR3: 0000000019fc1005 CR4: 00000000000606b0 > Call Trace: > ? ipc_update_pid+0x36/0x3e > ? newseg+0x34c/0x3a6 > ? ipcget+0x5d/0x528 > ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 > ? SyS_shmget+0x5a/0x84 > ? do_syscall_64+0x194/0x1b3 > ? entry_SYSCALL_64_after_hwframe+0x42/0xb7 > Code: ff 05 e7 20 9b 03 58 c9 c3 48 ff 05 85 21 9b 03 48 85 ff 74 4f 8b 47 04 8b 17 48 ff 05 7c 21 9b 03 48 83 c0 03 48 c1 e0 04 ff ca <48> 8b 44 07 08 74 1f 48 ff 05 6c 21 9b 03 ff 0f 0f 94 c2 48 ff > RIP: put_pid+0x22/0x5c RSP: ffff986719f73e48 > CR2: 0000000677846439 > ---[ end trace ab8c5cb4389d37c5 ]--- > Kernel panic - not syncing: Fatal exception In newseg when changing shm_cprid and shm_lprid from pid_t to struct pid* I misread the kvmalloc as kvzalloc and thought shp was initialized to 0. As that is not the case it is not safe to for the error handling to address shm_cprid and shm_lprid before they are initialized. Therefore move the cleanup of shm_cprid and shm_lprid from the no_file error cleanup path to the no_id error cleanup path. Ensuring that an early error exit won't cause the oops above. Reported-by:
kernel test robot <fengguang.wu@intel.com> Reviewed-by:
Nagarathnam Muthusamy <nagarathnam.muthusamy@oracle.com> Signed-off-by:
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Sheng Lan authored
commit 5845f706 upstream. It can be reproduced by following steps: 1. virtio_net NIC is configured with gso/tso on 2. configure nginx as http server with an index file bigger than 1M bytes 3. use tc netem to produce duplicate packets and delay: tc qdisc add dev eth0 root netem delay 100ms 10ms 30% duplicate 90% 4. continually curl the nginx http server to get index file on client 5. BUG_ON is seen quickly [10258690.371129] kernel BUG at net/core/skbuff.c:4028! [10258690.371748] invalid opcode: 0000 [#1] SMP PTI [10258690.372094] CPU: 5 PID: 0 Comm: swapper/5 Tainted: G W 5.0.0-rc6 #2 [10258690.372094] RSP: 0018:ffffa05797b43da0 EFLAGS: 00010202 [10258690.372094] RBP: 00000000000005ea R08: 0000000000000000 R09: 00000000000005ea [10258690.372094] R10: ffffa0579334d800 R11: 00000000000002c0 R12: 0000000000000002 [10258690.372094] R13: 0000000000000000 R14: ffffa05793122900 R15: ffffa0578f7cb028 [10258690.372094] FS: 0000000000000000(0000) GS:ffffa05797b40000(0000) knlGS:0000000000000000 [10258690.372094] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [10258690.372094] CR2: 00007f1a6dc00868 CR3: 000000001000e000 CR4: 00000000000006e0 [10258690.372094] Call Trace: [10258690.372094] <IRQ> [10258690.372094] skb_to_sgvec+0x11/0x40 [10258690.372094] start_xmit+0x38c/0x520 [virtio_net] [10258690.372094] dev_hard_start_xmit+0x9b/0x200 [10258690.372094] sch_direct_xmit+0xff/0x260 [10258690.372094] __qdisc_run+0x15e/0x4e0 [10258690.372094] net_tx_action+0x137/0x210 [10258690.372094] __do_softirq+0xd6/0x2a9 [10258690.372094] irq_exit+0xde/0xf0 [10258690.372094] smp_apic_timer_interrupt+0x74/0x140 [10258690.372094] apic_timer_interrupt+0xf/0x20 [10258690.372094] </IRQ> In __skb_to_sgvec(), the skb->len is not equal to the sum of the skb's linear data size and nonlinear data size, thus BUG_ON triggered. Because the skb is cloned and a part of nonlinear data is split off. Duplicate packet is cloned in netem_enqueue() and may be delayed some time in qdisc. When qdisc len reached the limit and returns NET_XMIT_DROP, the skb will be retransmit later in write queue. the skb will be fragmented by tso_fragment(), the limit size that depends on cwnd and mss decrease, the skb's nonlinear data will be split off. The length of the skb cloned by netem will not be updated. When we use virtio_net NIC and invoke skb_to_sgvec(), the BUG_ON trigger. To fix it, netem returns NET_XMIT_SUCCESS to upper stack when it clones a duplicate packet. Fixes: 35d889d1 ("sch_netem: fix skb leak in netem_enqueue()") Signed-off-by:
Sheng Lan <lansheng@huawei.com> Reported-by:
Qin Ji <jiqin.ji@huawei.com> Suggested-by:
Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by:
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Paul Moore authored
commit 5578de48 upstream. There are two array out-of-bounds memory accesses, one in cipso_v4_map_lvl_valid(), the other in netlbl_bitmap_walk(). Both errors are embarassingly simple, and the fixes are straightforward. As a FYI for anyone backporting this patch to kernels prior to v4.8, you'll want to apply the netlbl_bitmap_walk() patch to cipso_v4_bitmap_walk() as netlbl_bitmap_walk() doesn't exist before Linux v4.8. Reported-by:
Paul Moore <paul@paul-moore.com> Signed-off-by:
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Jann Horn authored
commit 0a1d5299 upstream. security_mmap_addr() does a capability check with current_cred(), but we can reach this code from contexts like a VFS write handler where current_cred() must not be used. This can be abused on systems without SMAP to make NULL pointer dereferences exploitable again. Fixes: 8869477a ("security: protect from stack expansion into low vm addresses") Signed-off-by:
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Oleg Nesterov authored
commit 32e4e6d5 upstream. expand_stack(vma) fails if address < stack_guard_gap even if there is no vma->vm_prev. I don't think this makes sense, and we didn't do this before the recent commit 1be7107f ("mm: larger stack guard gap, between vmas"). We do not need a gap in this case, any address is fine as long as security_mmap_addr() doesn't object. This also simplifies the code, we know that address >= prev->vm_end and thus underflow is not possible. Link: http://lkml.kernel.org/r/20170628175258.GA24881@redhat.com Signed-off-by:
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YueHaibing authored
commit 58bdd544 upstream. KASAN report this: BUG: KASAN: null-ptr-deref in nfc_llcp_build_gb+0x37f/0x540 [nfc] Read of size 3 at addr 0000000000000000 by task syz-executor.0/5401 CPU: 0 PID: 5401 Comm: syz-executor.0 Not tainted 5.0.0-rc7+ #45 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xfa/0x1ce lib/dump_stack.c:113 kasan_report+0x171/0x18d mm/kasan/report.c:321 memcpy+0x1f/0x50 mm/kasan/common.c:130 nfc_llcp_build_gb+0x37f/0x540 [nfc] nfc_llcp_register_device+0x6eb/0xb50 [nfc] nfc_register_device+0x50/0x1d0 [nfc] nfcsim_device_new+0x394/0x67d [nfcsim] ? 0xffffffffc1080000 nfcsim_init+0x6b/0x1000 [nfcsim] do_one_initcall+0xfa/0x5ca init/main.c:887 do_init_module+0x204/0x5f6 kernel/module.c:3460 load_module+0x66b2/0x8570 kernel/module.c:3808 __do_sys_finit_module+0x238/0x2a0 kernel/module.c:3902 do_syscall_64+0x147/0x600 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x462e99 Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9cb79dcc58 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 RAX: ffffffffffffffda RBX: 000000000073bf00 RCX: 0000000000462e99 RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000000000003 RBP: 00007f9cb79dcc70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9cb79dd6bc R13: 00000000004bcefb R14: 00000000006f7030 R15: 0000000000000004 nfc_llcp_build_tlv will return NULL on fails, caller should check it, otherwise will trigger a NULL dereference. Reported-by:
Hulk Robot <hulkci@huawei.com> Fixes: eda21f16 ("NFC: Set MIU and RW values from CONNECT and CC LLCP frames") Fixes: d646960f ("NFC: Initial LLCP support") Signed-off-by:
YueHaibing <yuehaibing@huawei.com> Signed-off-by:
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Rajasingh Thavamani authored
commit 232ba3a5 upstream. With Micrel KSZ8061 PHY, the link may occasionally not come up after Ethernet cable connect. The vendor's (Microchip, former Micrel) errata sheet 80000688A.pdf descripes the problem and possible workarounds in detail, see below. The batch implements workaround 1, which permanently fixes the issue. DESCRIPTION Link-up may not occur properly when the Ethernet cable is initially connected. This issue occurs more commonly when the cable is connected slowly, but it may occur any time a cable is connected. This issue occurs in the auto-negotiation circuit, and will not occur if auto-negotiation is disabled (which requires that the two link partners be set to the same speed and duplex). END USER IMPLICATIONS When this issue occurs, link is not established. Subsequent cable plug/unplaug cycle will not correct the issue. WORk AROUND There are four approaches to work around this issue: 1. This issue can be prevented by setting bit 15 in MMD device address 1, register 2, prior to connecting the cable or prior to setting the Restart Auto-negotiation bit in register 0h. The MMD registers are accessed via the indirect access registers Dh and Eh, or via the Micrel EthUtil utility as shown here: . if using the EthUtil utility (usually with a Micrel KSZ8061 Evaluation Board), type the following commands: > address 1 > mmd 1 > iw 2 b61a . Alternatively, write the following registers to write to the indirect MMD register: Write register Dh, data 0001h Write register Eh, data 0002h Write register Dh, data 4001h Write register Eh, data B61Ah 2. The issue can be avoided by disabling auto-negotiation in the KSZ8061, either by the strapping option, or by clearing bit 12 in register 0h. Care must be taken to ensure that the KSZ8061 and the link partner will link with the same speed and duplex. Note that the KSZ8061 defaults to full-duplex when auto-negotiation is off, but other devices may default to half-duplex in the event of failed auto-negotiation. 3. The issue can be avoided by connecting the cable prior to powering-up or resetting the KSZ8061, and leaving it plugged in thereafter. 4. If the above measures are not taken and the problem occurs, link can be recovered by setting the Restart Auto-Negotiation bit in register 0h, or by resetting or power cycling the device. Reset may be either hardware reset or software reset (register 0h, bit 15). PLAN This errata will not be corrected in the future revision. Fixes: 7ab59dc1 ("drivers/net/phy/micrel_phy: Add support for new PHYs") Signed-off-by:
Alexander Onnasch <alexander.onnasch@landisgyr.com> Signed-off-by:
Rajasingh Thavamani <T.Rajasingh@landisgyr.com> Reviewed-by:
Andrew Lunn <andrew@lunn.ch> Signed-off-by:
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Darrick J. Wong authored
commit 29b00e60 upstream. When we made the shmem_reserve_inode call in shmem_link conditional, we forgot to update the declaration for ret so that it always has a known value. Dan Carpenter pointed out this deficiency in the original patch. Fixes: 1062af92 ("tmpfs: fix link accounting when a tmpfile is linked in") Reported-by:
Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by:
Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by:
Hugh Dickins <hughd@google.com> Cc: Matej Kupljen <matej.kupljen@gmail.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
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Andy Lutomirski authored
commit 2a418cf3 upstream. When calling __put_user(foo(), ptr), the __put_user() macro would call foo() in between __uaccess_begin() and __uaccess_end(). If that code were buggy, then those bugs would be run without SMAP protection. Fortunately, there seem to be few instances of the problem in the kernel. Nevertheless, __put_user() should be fixed to avoid doing this. Therefore, evaluate __put_user()'s argument before setting AC. This issue was noticed when an objtool hack by Peter Zijlstra complained about genregs_get() and I compared the assembly output to the C source. [ bp: Massage commit message and fixed up whitespace. ] Fixes: 11f1a4b9 ("x86: reorganize SMAP handling in user space accesses") Signed-off-by:
Andy Lutomirski <luto@kernel.org> Signed-off-by:
Borislav Petkov <bp@suse.de> Acked-by:
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Sergei Shtylyov authored
commit 5c27ff5d upstream. I have encountered an interrupt storm during the eMMC chip probing (and the chip finally didn't get detected). It turned out that U-Boot left the DMAC interrupts enabled while the Linux driver didn't use those. The SDHI driver's interrupt handler somehow assumes that, even if an SDIO interrupt didn't happen, it should return IRQ_HANDLED. I think that if none of the enabled interrupts happened and got handled, we should return IRQ_NONE -- that way the kernel IRQ code recoginizes a spurious interrupt and masks it off pretty quickly... Fixes: 7729c7a2 ("mmc: tmio: Provide separate interrupt handlers") Signed-off-by:
Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Reviewed-by:
Wolfram Sang <wsa+renesas@sang-engineering.com> Tested-by:
Simon Horman <horms+renesas@verge.net.au> Signed-off-by:
Ulf Hansson <ulf.hansson@linaro.org> [bwh: Backported to 3.16: - tmio_mmc_sdio_irq() can be used directly as an interrupt handler, so make it return IRQ_NONE for unhandled interrupts - Adjust filename] Signed-off-by:
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