1. 06 Jul, 2016 3 commits
  2. 15 Jun, 2016 1 commit
  3. 13 Jun, 2016 2 commits
    • Jaegeuk Kim's avatar
      f2fs: fix deadlock in add_link failure · c92737ce
      Jaegeuk Kim authored
      mkdir                        sync_dirty_inode
       - init_inode_metadata
         - lock_page(node)
         - make_empty_dir
                                   - filemap_fdatawrite()
                                    - do_writepages
                                    - lock_page(data)
                                    - write_page(data)
                                     - lock_page(node)
         - f2fs_init_acl
          - error
         - truncate_inode_pages
          - lock_page(data)
      
      So, we don't need to truncate data pages in this error case, which will
      be done by f2fs_evict_inode.
      Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
      c92737ce
    • Jaegeuk Kim's avatar
      f2fs: introduce mode=lfs mount option · 36abef4e
      Jaegeuk Kim authored
      This mount option is to enable original log-structured filesystem forcefully.
      So, there should be no random writes for main area.
      
      Especially, this supports host-managed SMR device.
      Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
      36abef4e
  4. 08 Jun, 2016 4 commits
  5. 07 Jun, 2016 6 commits
  6. 03 Jun, 2016 20 commits
  7. 02 Jun, 2016 4 commits
    • Linus Torvalds's avatar
      Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm · 4340fa55
      Linus Torvalds authored
      Pull KVM fixes from Radim Krčmář:
       "ARM:
         - two fixes for 4.6 vgic [Christoffer] (cc stable)
      
         - six fixes for 4.7 vgic [Marc]
      
        x86:
         - six fixes from syzkaller reports [Paolo] (two of them cc stable)
      
         - allow OS X to boot [Dmitry]
      
         - don't trust compilers [Nadav]"
      
      * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
        KVM: x86: fix OOPS after invalid KVM_SET_DEBUGREGS
        KVM: x86: avoid vmalloc(0) in the KVM_SET_CPUID
        KVM: irqfd: fix NULL pointer dereference in kvm_irq_map_gsi
        KVM: fail KVM_SET_VCPU_EVENTS with invalid exception number
        KVM: x86: avoid vmalloc(0) in the KVM_SET_CPUID
        kvm: x86: avoid warning on repeated KVM_SET_TSS_ADDR
        KVM: Handle MSR_IA32_PERF_CTL
        KVM: x86: avoid write-tearing of TDP
        KVM: arm/arm64: vgic-new: Removel harmful BUG_ON
        arm64: KVM: vgic-v3: Relax synchronization when SRE==1
        arm64: KVM: vgic-v3: Prevent the guest from messing with ICC_SRE_EL1
        arm64: KVM: Make ICC_SRE_EL1 access return the configured SRE value
        KVM: arm/arm64: vgic-v3: Always resample level interrupts
        KVM: arm/arm64: vgic-v2: Always resample level interrupts
        KVM: arm/arm64: vgic-v3: Clear all dirty LRs
        KVM: arm/arm64: vgic-v2: Clear all dirty LRs
      4340fa55
    • Paolo Bonzini's avatar
      KVM: x86: fix OOPS after invalid KVM_SET_DEBUGREGS · d14bdb55
      Paolo Bonzini authored
      MOV to DR6 or DR7 causes a #GP if an attempt is made to write a 1 to
      any of bits 63:32.  However, this is not detected at KVM_SET_DEBUGREGS
      time, and the next KVM_RUN oopses:
      
         general protection fault: 0000 [#1] SMP
         CPU: 2 PID: 14987 Comm: a.out Not tainted 4.4.9-300.fc23.x86_64 #1
         Hardware name: LENOVO 2325F51/2325F51, BIOS G2ET32WW (1.12 ) 05/30/2012
         [...]
         Call Trace:
          [<ffffffffa072c93d>] kvm_arch_vcpu_ioctl_run+0x141d/0x14e0 [kvm]
          [<ffffffffa071405d>] kvm_vcpu_ioctl+0x33d/0x620 [kvm]
          [<ffffffff81241648>] do_vfs_ioctl+0x298/0x480
          [<ffffffff812418a9>] SyS_ioctl+0x79/0x90
          [<ffffffff817a0f2e>] entry_SYSCALL_64_fastpath+0x12/0x71
         Code: 55 83 ff 07 48 89 e5 77 27 89 ff ff 24 fd 90 87 80 81 0f 23 fe 5d c3 0f 23 c6 5d c3 0f 23 ce 5d c3 0f 23 d6 5d c3 0f 23 de 5d c3 <0f> 23 f6 5d c3 0f 0b 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00
         RIP  [<ffffffff810639eb>] native_set_debugreg+0x2b/0x40
          RSP <ffff88005836bd50>
      
      Testcase (beautified/reduced from syzkaller output):
      
          #include <unistd.h>
          #include <sys/syscall.h>
          #include <string.h>
          #include <stdint.h>
          #include <linux/kvm.h>
          #include <fcntl.h>
          #include <sys/ioctl.h>
      
          long r[8];
      
          int main()
          {
              struct kvm_debugregs dr = { 0 };
      
              r[2] = open("/dev/kvm", O_RDONLY);
              r[3] = ioctl(r[2], KVM_CREATE_VM, 0);
              r[4] = ioctl(r[3], KVM_CREATE_VCPU, 7);
      
              memcpy(&dr,
                     "\x5d\x6a\x6b\xe8\x57\x3b\x4b\x7e\xcf\x0d\xa1\x72"
                     "\xa3\x4a\x29\x0c\xfc\x6d\x44\x00\xa7\x52\xc7\xd8"
                     "\x00\xdb\x89\x9d\x78\xb5\x54\x6b\x6b\x13\x1c\xe9"
                     "\x5e\xd3\x0e\x40\x6f\xb4\x66\xf7\x5b\xe3\x36\xcb",
                     48);
              r[7] = ioctl(r[4], KVM_SET_DEBUGREGS, &dr);
              r[6] = ioctl(r[4], KVM_RUN, 0);
          }
      Reported-by: default avatarDmitry Vyukov <dvyukov@google.com>
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
      Signed-off-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
      d14bdb55
    • Paolo Bonzini's avatar
      KVM: x86: avoid vmalloc(0) in the KVM_SET_CPUID · f8c1b85b
      Paolo Bonzini authored
      This causes an ugly dmesg splat.  Beautified syzkaller testcase:
      
          #include <unistd.h>
          #include <sys/syscall.h>
          #include <sys/ioctl.h>
          #include <fcntl.h>
          #include <linux/kvm.h>
      
          long r[8];
      
          int main()
          {
              struct kvm_irq_routing ir = { 0 };
              r[2] = open("/dev/kvm", O_RDWR);
              r[3] = ioctl(r[2], KVM_CREATE_VM, 0);
              r[4] = ioctl(r[3], KVM_SET_GSI_ROUTING, &ir);
              return 0;
          }
      Reported-by: default avatarDmitry Vyukov <dvyukov@google.com>
      Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
      Signed-off-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
      f8c1b85b
    • Paolo Bonzini's avatar
      KVM: irqfd: fix NULL pointer dereference in kvm_irq_map_gsi · c622a3c2
      Paolo Bonzini authored
      Found by syzkaller:
      
          BUG: unable to handle kernel NULL pointer dereference at 0000000000000120
          IP: [<ffffffffa0797202>] kvm_irq_map_gsi+0x12/0x90 [kvm]
          PGD 6f80b067 PUD b6535067 PMD 0
          Oops: 0000 [#1] SMP
          CPU: 3 PID: 4988 Comm: a.out Not tainted 4.4.9-300.fc23.x86_64 #1
          [...]
          Call Trace:
           [<ffffffffa0795f62>] irqfd_update+0x32/0xc0 [kvm]
           [<ffffffffa0796c7c>] kvm_irqfd+0x3dc/0x5b0 [kvm]
           [<ffffffffa07943f4>] kvm_vm_ioctl+0x164/0x6f0 [kvm]
           [<ffffffff81241648>] do_vfs_ioctl+0x298/0x480
           [<ffffffff812418a9>] SyS_ioctl+0x79/0x90
           [<ffffffff817a1062>] tracesys_phase2+0x84/0x89
          Code: b5 71 a7 e0 5b 41 5c 41 5d 5d f3 c3 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 8b 8f 10 2e 00 00 31 c0 48 89 e5 <39> 91 20 01 00 00 76 6a 48 63 d2 48 8b 94 d1 28 01 00 00 48 85
          RIP  [<ffffffffa0797202>] kvm_irq_map_gsi+0x12/0x90 [kvm]
           RSP <ffff8800926cbca8>
          CR2: 0000000000000120
      
      Testcase:
      
          #include <unistd.h>
          #include <sys/syscall.h>
          #include <string.h>
          #include <stdint.h>
          #include <linux/kvm.h>
          #include <fcntl.h>
          #include <sys/ioctl.h>
      
          long r[26];
      
          int main()
          {
              memset(r, -1, sizeof(r));
              r[2] = open("/dev/kvm", 0);
              r[3] = ioctl(r[2], KVM_CREATE_VM, 0);
      
              struct kvm_irqfd ifd;
              ifd.fd = syscall(SYS_eventfd2, 5, 0);
              ifd.gsi = 3;
              ifd.flags = 2;
              ifd.resamplefd = ifd.fd;
              r[25] = ioctl(r[3], KVM_IRQFD, &ifd);
              return 0;
          }
      Reported-by: default avatarDmitry Vyukov <dvyukov@google.com>
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
      Signed-off-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
      c622a3c2