1. 27 Nov, 2018 5 commits
    • Liran Alon's avatar
      KVM: nVMX: Fix kernel info-leak when enabling KVM_CAP_HYPERV_ENLIGHTENED_VMCS more than once · 7f9ad1df
      Liran Alon authored
      Consider the case that userspace enables KVM_CAP_HYPERV_ENLIGHTENED_VMCS twice:
      1) kvm_vcpu_ioctl_enable_cap() is called to enable
      KVM_CAP_HYPERV_ENLIGHTENED_VMCS which calls nested_enable_evmcs().
      2) nested_enable_evmcs() sets enlightened_vmcs_enabled to true and fills
      vmcs_version which is then copied to userspace.
      3) kvm_vcpu_ioctl_enable_cap() is called again to enable
      KVM_CAP_HYPERV_ENLIGHTENED_VMCS which calls nested_enable_evmcs().
      4) This time nested_enable_evmcs() just returns 0 as
      enlightened_vmcs_enabled is already true. *Without filling
      vmcs_version*.
      5) kvm_vcpu_ioctl_enable_cap() continues as usual and copies
      *uninitialized* vmcs_version to userspace which leads to kernel info-leak.
      
      Fix this issue by simply changing nested_enable_evmcs() to always fill
      vmcs_version output argument. Even when enlightened_vmcs_enabled is
      already set to true.
      
      Note that SVM's nested_enable_evmcs() should not be modified because it
      always returns a non-zero value (-ENODEV) which results in
      kvm_vcpu_ioctl_enable_cap() skipping the copy of vmcs_version to
      userspace (as it should).
      
      Fixes: 57b119da ("KVM: nVMX: add KVM_CAP_HYPERV_ENLIGHTENED_VMCS capability")
      Reported-by: syzbot+cfbc368e283d381f8cef@syzkaller.appspotmail.com
      Reviewed-by: default avatarKrish Sadhukhan <krish.sadhukhan@oracle.com>
      Reviewed-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
      Signed-off-by: default avatarLiran Alon <liran.alon@oracle.com>
      Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
      7f9ad1df
    • Wei Wang's avatar
      svm: Add mutex_lock to protect apic_access_page_done on AMD systems · 30510387
      Wei Wang authored
      There is a race condition when accessing kvm->arch.apic_access_page_done.
      Due to it, x86_set_memory_region will fail when creating the second vcpu
      for a svm guest.
      
      Add a mutex_lock to serialize the accesses to apic_access_page_done.
      This lock is also used by vmx for the same purpose.
      Signed-off-by: default avatarWei Wang <wawei@amazon.de>
      Signed-off-by: default avatarAmadeusz Juskowiak <ajusk@amazon.de>
      Signed-off-by: default avatarJulian Stecklina <jsteckli@amazon.de>
      Signed-off-by: default avatarSuravee Suthikulpanit <suravee.suthikulpanit@amd.com>
      Reviewed-by: default avatarJoerg Roedel <jroedel@suse.de>
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
      30510387
    • Wanpeng Li's avatar
      KVM: X86: Fix scan ioapic use-before-initialization · e97f852f
      Wanpeng Li authored
      Reported by syzkaller:
      
       BUG: unable to handle kernel NULL pointer dereference at 00000000000001c8
       PGD 80000003ec4da067 P4D 80000003ec4da067 PUD 3f7bfa067 PMD 0
       Oops: 0000 [#1] PREEMPT SMP PTI
       CPU: 7 PID: 5059 Comm: debug Tainted: G           OE     4.19.0-rc5 #16
       RIP: 0010:__lock_acquire+0x1a6/0x1990
       Call Trace:
        lock_acquire+0xdb/0x210
        _raw_spin_lock+0x38/0x70
        kvm_ioapic_scan_entry+0x3e/0x110 [kvm]
        vcpu_enter_guest+0x167e/0x1910 [kvm]
        kvm_arch_vcpu_ioctl_run+0x35c/0x610 [kvm]
        kvm_vcpu_ioctl+0x3e9/0x6d0 [kvm]
        do_vfs_ioctl+0xa5/0x690
        ksys_ioctl+0x6d/0x80
        __x64_sys_ioctl+0x1a/0x20
        do_syscall_64+0x83/0x6e0
        entry_SYSCALL_64_after_hwframe+0x49/0xbe
      
      The reason is that the testcase writes hyperv synic HV_X64_MSR_SINT6 msr
      and triggers scan ioapic logic to load synic vectors into EOI exit bitmap.
      However, irqchip is not initialized by this simple testcase, ioapic/apic
      objects should not be accessed.
      This can be triggered by the following program:
      
          #define _GNU_SOURCE
      
          #include <endian.h>
          #include <stdint.h>
          #include <stdio.h>
          #include <stdlib.h>
          #include <string.h>
          #include <sys/syscall.h>
          #include <sys/types.h>
          #include <unistd.h>
      
          uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};
      
          int main(void)
          {
          	syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
          	long res = 0;
          	memcpy((void*)0x20000040, "/dev/kvm", 9);
          	res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000040, 0, 0);
          	if (res != -1)
          		r[0] = res;
          	res = syscall(__NR_ioctl, r[0], 0xae01, 0);
          	if (res != -1)
          		r[1] = res;
          	res = syscall(__NR_ioctl, r[1], 0xae41, 0);
          	if (res != -1)
          		r[2] = res;
          	memcpy(
          			(void*)0x20000080,
          			"\x01\x00\x00\x00\x00\x5b\x61\xbb\x96\x00\x00\x40\x00\x00\x00\x00\x01\x00"
          			"\x08\x00\x00\x00\x00\x00\x0b\x77\xd1\x78\x4d\xd8\x3a\xed\xb1\x5c\x2e\x43"
          			"\xaa\x43\x39\xd6\xff\xf5\xf0\xa8\x98\xf2\x3e\x37\x29\x89\xde\x88\xc6\x33"
          			"\xfc\x2a\xdb\xb7\xe1\x4c\xac\x28\x61\x7b\x9c\xa9\xbc\x0d\xa0\x63\xfe\xfe"
          			"\xe8\x75\xde\xdd\x19\x38\xdc\x34\xf5\xec\x05\xfd\xeb\x5d\xed\x2e\xaf\x22"
          			"\xfa\xab\xb7\xe4\x42\x67\xd0\xaf\x06\x1c\x6a\x35\x67\x10\x55\xcb",
          			106);
          	syscall(__NR_ioctl, r[2], 0x4008ae89, 0x20000080);
          	syscall(__NR_ioctl, r[2], 0xae80, 0);
          	return 0;
          }
      
      This patch fixes it by bailing out scan ioapic if ioapic is not initialized in
      kernel.
      Reported-by: default avatarWei Wu <ww9210@gmail.com>
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Cc: Radim Krčmář <rkrcmar@redhat.com>
      Cc: Wei Wu <ww9210@gmail.com>
      Signed-off-by: default avatarWanpeng Li <wanpengli@tencent.com>
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
      e97f852f
    • Wanpeng Li's avatar
      KVM: LAPIC: Fix pv ipis use-before-initialization · 38ab012f
      Wanpeng Li authored
      Reported by syzkaller:
      
       BUG: unable to handle kernel NULL pointer dereference at 0000000000000014
       PGD 800000040410c067 P4D 800000040410c067 PUD 40410d067 PMD 0
       Oops: 0000 [#1] PREEMPT SMP PTI
       CPU: 3 PID: 2567 Comm: poc Tainted: G           OE     4.19.0-rc5 #16
       RIP: 0010:kvm_pv_send_ipi+0x94/0x350 [kvm]
       Call Trace:
        kvm_emulate_hypercall+0x3cc/0x700 [kvm]
        handle_vmcall+0xe/0x10 [kvm_intel]
        vmx_handle_exit+0xc1/0x11b0 [kvm_intel]
        vcpu_enter_guest+0x9fb/0x1910 [kvm]
        kvm_arch_vcpu_ioctl_run+0x35c/0x610 [kvm]
        kvm_vcpu_ioctl+0x3e9/0x6d0 [kvm]
        do_vfs_ioctl+0xa5/0x690
        ksys_ioctl+0x6d/0x80
        __x64_sys_ioctl+0x1a/0x20
        do_syscall_64+0x83/0x6e0
        entry_SYSCALL_64_after_hwframe+0x49/0xbe
      
      The reason is that the apic map has not yet been initialized, the testcase
      triggers pv_send_ipi interface by vmcall which results in kvm->arch.apic_map
      is dereferenced. This patch fixes it by checking whether or not apic map is
      NULL and bailing out immediately if that is the case.
      
      Fixes: 4180bf1b (KVM: X86: Implement "send IPI" hypercall)
      Reported-by: default avatarWei Wu <ww9210@gmail.com>
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Cc: Radim Krčmář <rkrcmar@redhat.com>
      Cc: Wei Wu <ww9210@gmail.com>
      Signed-off-by: default avatarWanpeng Li <wanpengli@tencent.com>
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
      38ab012f
    • Luiz Capitulino's avatar
      KVM: VMX: re-add ple_gap module parameter · a87c99e6
      Luiz Capitulino authored
      Apparently, the ple_gap parameter was accidentally removed
      by commit c8e88717. Add it
      back.
      Signed-off-by: default avatarLuiz Capitulino <lcapitulino@redhat.com>
      Cc: stable@vger.kernel.org
      Fixes: c8e88717Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
      a87c99e6
  2. 25 Nov, 2018 1 commit
  3. 18 Nov, 2018 23 commits
  4. 16 Nov, 2018 9 commits
    • Linus Torvalds's avatar
      Merge tag 'fsnotify_for_v4.20-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs · 1ce80e0f
      Linus Torvalds authored
      Pull fsnotify fix from Jan Kara:
       "One small fsnotify fix for duplicate events"
      
      * tag 'fsnotify_for_v4.20-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
        fanotify: fix handling of events on child sub-directory
      1ce80e0f
    • Linus Torvalds's avatar
      Merge tag 'gfs2-4.20.fixes3' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2 · e6a2562f
      Linus Torvalds authored
      Pull bfs2 fixes from Andreas Gruenbacher:
       "Fix two bugs leading to leaked buffer head references:
      
         - gfs2: Put bitmap buffers in put_super
         - gfs2: Fix iomap buffer head reference counting bug
      
        And one bug leading to significant slow-downs when deleting large
        files:
      
         - gfs2: Fix metadata read-ahead during truncate (2)"
      
      * tag 'gfs2-4.20.fixes3' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2:
        gfs2: Fix iomap buffer head reference counting bug
        gfs2: Fix metadata read-ahead during truncate (2)
        gfs2: Put bitmap buffers in put_super
      e6a2562f
    • Andreas Gruenbacher's avatar
      gfs2: Fix iomap buffer head reference counting bug · c26b5aa8
      Andreas Gruenbacher authored
      GFS2 passes the inode buffer head (dibh) from gfs2_iomap_begin to
      gfs2_iomap_end in iomap->private.  It sets that private pointer in
      gfs2_iomap_get.  Users of gfs2_iomap_get other than gfs2_iomap_begin
      would have to release iomap->private, but this isn't done correctly,
      leading to a leak of buffer head references.
      
      To fix this, move the code for setting iomap->private from
      gfs2_iomap_get to gfs2_iomap_begin.
      
      Fixes: 64bc06bb ("gfs2: iomap buffered write support")
      Cc: stable@vger.kernel.org # v4.19+
      Signed-off-by: default avatarAndreas Gruenbacher <agruenba@redhat.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      c26b5aa8
    • Linus Torvalds's avatar
      Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 · 32e2524a
      Linus Torvalds authored
      Pull crypto fixes from Herbert Xu:
       "This fixes the following issues:
      
         - Potential memory overwrite in simd
      
         - Kernel info leaks in crypto_user
      
         - NULL dereference and use-after-free in hisilicon"
      
      * 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
        crypto: user - Zeroize whole structure given to user space
        crypto: user - fix leaking uninitialized memory to userspace
        crypto: simd - correctly take reqsize of wrapped skcipher into account
        crypto: hisilicon - Fix reference after free of memories on error path
        crypto: hisilicon - Fix NULL dereference for same dst and src
      32e2524a
    • Linus Torvalds's avatar
      Merge tag 'drm-fixes-2018-11-16' of git://anongit.freedesktop.org/drm/drm · 4efd3460
      Linus Torvalds authored
      Pull drm fixes from Dave Airlie:
       "Live from Vancouver, SoC maintainer talk, this weeks drm fixes pull
        for rc3:
      
        omapdrm:
         - regression fixes for the reordering bridge stuff that went into rc1
      
        i915:
         - incorrect EU count fix
         - HPD storm fix
         - MST fix
         - relocation fix for gen4/5
      
        amdgpu:
         - huge page handling fix
         - IH ring setup
         - XGMI aperture setup
         - watermark setup fix
      
        misc:
         - docs and MST fix"
      
      * tag 'drm-fixes-2018-11-16' of git://anongit.freedesktop.org/drm/drm: (23 commits)
        drm/i915: Account for scale factor when calculating initial phase
        drm/i915: Clean up skl_program_scaler()
        drm/i915: Move programming plane scaler to its own function.
        drm/i915/icl: Drop spurious register read from icl_dbuf_slices_update
        drm/i915: fix broadwell EU computation
        drm/amdgpu: fix huge page handling on Vega10
        drm/amd/pp: Fix truncated clock value when set watermark
        drm/amdgpu: fix bug with IH ring setup
        drm/meson: venc: dmt mode must use encp
        drm/amdgpu: set system aperture to cover whole FB region
        drm/i915: Fix hpd handling for pins with two encoders
        drm/i915/execlists: Force write serialisation into context image vs execution
        drm/i915/icl: Fix power well 2 wrt. DC-off toggling order
        drm/i915: Fix NULL deref when re-enabling HPD IRQs on systems with MST
        drm/i915: Fix possible race in intel_dp_add_mst_connector()
        drm/i915/ringbuffer: Delay after EMIT_INVALIDATE for gen4/gen5
        drm/omap: dsi: Fix missing of_platform_depopulate()
        drm/omap: Move DISPC runtime PM handling to omapdrm
        drm/omap: dsi: Ensure the device is active during probe
        drm/omap: hdmi4: Ensure the device is active during bind
        ...
      4efd3460
    • Linus Torvalds's avatar
      Merge tag 'powerpc-4.20-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux · ef268de1
      Linus Torvalds authored
      Pull powerpc fixes from Michael Ellerman:
       "Two weeks worth of fixes since rc1.
      
         - I broke 16-byte alignment of the stack when we moved PPR into
           pt_regs. Despite being required by the ABI this broke almost
           nothing, we eventually hit it in code where GCC does arithmetic on
           the stack pointer assuming the bottom 4 bits are clear. Fix it by
           padding the in-kernel pt_regs by 8 bytes.
      
         - A couple of commits fixing minor bugs in the recent SLB rewrite.
      
         - A build fix related to tracepoints in KVM in some configurations.
      
         - Our old "IO workarounds" code written for Cell couldn't coexist in
           a kernel that runs on Power9 with the Radix MMU, fix that.
      
         - Remove the NPU DMA ops, these just printed a warning and should
           never have been called.
      
         - Suppress an overly chatty message triggered by CPU hotplug in some
           configs.
      
         - Two small selftest fixes.
      
        Thanks to: Alistair Popple, Gustavo Romero, Nicholas Piggin, Satheesh
        Rajendran, Scott Wood"
      
      * tag 'powerpc-4.20-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
        selftests/powerpc: Adjust wild_bctr to build with old binutils
        powerpc/64: Fix kernel stack 16-byte alignment
        powerpc/numa: Suppress "VPHN is not supported" messages
        selftests/powerpc: Fix wild_bctr test to work on ppc64
        powerpc/io: Fix the IO workarounds code to work with Radix
        powerpc/mm/64s: Fix preempt warning in slb_allocate_kernel()
        KVM: PPC: Move and undef TRACE_INCLUDE_PATH/FILE
        powerpc/mm/64s: Only use slbfee on CPUs that support it
        powerpc/mm/64s: Use PPC_SLBFEE macro
        powerpc/mm/64s: Consolidate SLB assertions
        powerpc/powernv/npu: Remove NPU DMA ops
      ef268de1
    • Linus Torvalds's avatar
      Merge tag 'xtensa-20181115' of git://github.com/jcmvbkbc/linux-xtensa · 50d25bdc
      Linus Torvalds authored
      Pull Xtensa fixes from Max Filippov:
      
       - fix stack alignment for bFLT binaries.
      
       - fix physical-to-virtual address translation for boot parameters in
         MMUv3 256+256 and 512+512 virtual memory layouts.
      
      * tag 'xtensa-20181115' of git://github.com/jcmvbkbc/linux-xtensa:
        xtensa: fix boot parameters address translation
        xtensa: make sure bFLT stack is 16 byte aligned
      50d25bdc
    • Linus Torvalds's avatar
      Merge tag 'for-linus-20181115' of git://git.kernel.dk/linux-block · 59749c2d
      Linus Torvalds authored
      Pull block fixes from Jens Axboe:
      
       - Discard loop fix, caused by integer overflow (Dave)
      
       - Blacklist of Samsung drive that hangs with power management (Diego)
      
       - Copy bio priority when cloning it (Hannes)
      
       - Fix race condition exposed in floppy (me)
      
       - Fix SCSI queue cleanup regression. While elusive, it caused oopses in
         queue running (Ming)
      
       - Fix bad string copy in kyber tracing (Omar)
      
      * tag 'for-linus-20181115' of git://git.kernel.dk/linux-block:
        SCSI: fix queue cleanup race before queue initialization is done
        block: fix 32 bit overflow in __blkdev_issue_discard()
        libata: blacklist SAMSUNG MZ7TD256HAFV-000L9 SSD
        block: copy ioprio in __bio_clone_fast() and bounce
        kyber: fix wrong strlcpy() size in trace_kyber_latency()
        floppy: fix race condition in __floppy_read_block_0()
      59749c2d
    • Linus Torvalds's avatar
      Merge tag 'fuse-fixes-4.20-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse · 9b5f361a
      Linus Torvalds authored
      Pull fuse fixes from Miklos Szeredi:
       "A couple of fixes, all bound for -stable (i.e. not regressions in this
        cycle)"
      
      * tag 'fuse-fixes-4.20-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse:
        fuse: fix use-after-free in fuse_direct_IO()
        fuse: fix possibly missed wake-up after abort
        fuse: fix leaked notify reply
      9b5f361a
  5. 15 Nov, 2018 2 commits