Fix CVE-2017-17741 (rhbz 1527112 1527113)
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@ -673,6 +673,9 @@ Patch628: HID-rmi-Check-that-a-device-is-a-RMI-device-before-c.patch
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# CVE-2017-17712 rhbz 1526427 1526933
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Patch629: net-ipv4-fix-for-a-race-condition-in-raw_sendmsg.patch
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# CVE-2017-17741 rhbz 1527112 1527113
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Patch630: v4-KVM-Fix-stack-out-of-bounds-read-in-write_mmio.patch
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# END OF PATCH DEFINITIONS
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%endif
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@ -2227,6 +2230,9 @@ fi
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#
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#
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%changelog
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* Tue Dec 19 2017 Justin M. Forbes <jforbes@fedoraproject.org>
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- Fix CVE-2017-17741 (rhbz 1527112 1527113)
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* Mon Dec 18 2017 Justin M. Forbes <jforbes@fedoraproject.org> - 4.14.7-300
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- Linux v4.14.7
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- Fix CVE-2017-17712 (rhbz 1526427 1526933)
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@ -0,0 +1,215 @@
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From patchwork Fri Dec 15 01:40:50 2017
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Content-Type: text/plain; charset="utf-8"
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MIME-Version: 1.0
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Content-Transfer-Encoding: 8bit
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Subject: [v4] KVM: Fix stack-out-of-bounds read in write_mmio
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From: Wanpeng Li <kernellwp@gmail.com>
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X-Patchwork-Id: 10113513
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Message-Id: <1513302050-14253-1-git-send-email-wanpeng.li@hotmail.com>
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To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
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Cc: Paolo Bonzini <pbonzini@redhat.com>,
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=?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= <rkrcmar@redhat.com>,
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Wanpeng Li <wanpeng.li@hotmail.com>, Marc Zyngier <marc.zyngier@arm.com>,
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Christoffer Dall <christoffer.dall@linaro.org>
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Date: Thu, 14 Dec 2017 17:40:50 -0800
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From: Wanpeng Li <wanpeng.li@hotmail.com>
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Reported by syzkaller:
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BUG: KASAN: stack-out-of-bounds in write_mmio+0x11e/0x270 [kvm]
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Read of size 8 at addr ffff8803259df7f8 by task syz-executor/32298
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CPU: 6 PID: 32298 Comm: syz-executor Tainted: G OE 4.15.0-rc2+ #18
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Hardware name: LENOVO ThinkCentre M8500t-N000/SHARKBAY, BIOS FBKTC1AUS 02/16/2016
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Call Trace:
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dump_stack+0xab/0xe1
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print_address_description+0x6b/0x290
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kasan_report+0x28a/0x370
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write_mmio+0x11e/0x270 [kvm]
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emulator_read_write_onepage+0x311/0x600 [kvm]
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emulator_read_write+0xef/0x240 [kvm]
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emulator_fix_hypercall+0x105/0x150 [kvm]
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em_hypercall+0x2b/0x80 [kvm]
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x86_emulate_insn+0x2b1/0x1640 [kvm]
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x86_emulate_instruction+0x39a/0xb90 [kvm]
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handle_exception+0x1b4/0x4d0 [kvm_intel]
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vcpu_enter_guest+0x15a0/0x2640 [kvm]
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kvm_arch_vcpu_ioctl_run+0x549/0x7d0 [kvm]
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kvm_vcpu_ioctl+0x479/0x880 [kvm]
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do_vfs_ioctl+0x142/0x9a0
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SyS_ioctl+0x74/0x80
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entry_SYSCALL_64_fastpath+0x23/0x9a
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The path of patched vmmcall will patch 3 bytes opcode 0F 01 C1(vmcall)
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to the guest memory, however, write_mmio tracepoint always prints 8 bytes
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through *(u64 *)val since kvm splits the mmio access into 8 bytes. This
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can result in stack-out-of-bounds read due to access the extra 5 bytes.
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This patch fixes it by just accessing the bytes which we operates on.
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Before patch:
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syz-executor-5567 [007] .... 51370.561696: kvm_mmio: mmio write len 3 gpa 0x10 val 0x1ffff10077c1010f
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After patch:
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syz-executor-13416 [002] .... 51302.299573: kvm_mmio: mmio write len 3 gpa 0x10 val 0xc1010f
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Reported-by: Dmitry Vyukov <dvyukov@google.com>
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Cc: Paolo Bonzini <pbonzini@redhat.com>
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Cc: Radim Krčmář <rkrcmar@redhat.com>
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Cc: Marc Zyngier <marc.zyngier@arm.com>
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Cc: Christoffer Dall <christoffer.dall@linaro.org>
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Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
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Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
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Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
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Tested-by: Marc Zyngier <marc.zyngier@arm.com>
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---
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v3 -> v4:
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* fix the arm tracepoint
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v2 -> v3:
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* fix sparse warning
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v1 -> v2:
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* do the memcpy in kvm_mmio tracepoint
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arch/x86/kvm/x86.c | 8 ++++----
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include/trace/events/kvm.h | 6 ++++--
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virt/kvm/arm/mmio.c | 6 +++---
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3 files changed, 11 insertions(+), 9 deletions(-)
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diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
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index 0f82e2c..c7071e7 100644
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--- a/arch/x86/kvm/x86.c
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+++ b/arch/x86/kvm/x86.c
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@@ -4456,7 +4456,7 @@ static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v)
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addr, n, v))
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&& kvm_io_bus_read(vcpu, KVM_MMIO_BUS, addr, n, v))
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break;
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- trace_kvm_mmio(KVM_TRACE_MMIO_READ, n, addr, *(u64 *)v);
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+ trace_kvm_mmio(KVM_TRACE_MMIO_READ, n, addr, v);
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handled += n;
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addr += n;
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len -= n;
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@@ -4715,7 +4715,7 @@ static int read_prepare(struct kvm_vcpu *vcpu, void *val, int bytes)
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{
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if (vcpu->mmio_read_completed) {
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trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes,
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- vcpu->mmio_fragments[0].gpa, *(u64 *)val);
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+ vcpu->mmio_fragments[0].gpa, val);
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vcpu->mmio_read_completed = 0;
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return 1;
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}
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@@ -4737,14 +4737,14 @@ static int write_emulate(struct kvm_vcpu *vcpu, gpa_t gpa,
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static int write_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes, void *val)
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{
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- trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, bytes, gpa, *(u64 *)val);
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+ trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, bytes, gpa, val);
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return vcpu_mmio_write(vcpu, gpa, bytes, val);
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}
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static int read_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa,
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void *val, int bytes)
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{
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- trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, 0);
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+ trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, NULL);
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return X86EMUL_IO_NEEDED;
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}
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diff --git a/include/trace/events/kvm.h b/include/trace/events/kvm.h
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index e4b0b8e..dfd2170 100644
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--- a/include/trace/events/kvm.h
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+++ b/include/trace/events/kvm.h
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@@ -211,7 +211,7 @@ TRACE_EVENT(kvm_ack_irq,
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{ KVM_TRACE_MMIO_WRITE, "write" }
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TRACE_EVENT(kvm_mmio,
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- TP_PROTO(int type, int len, u64 gpa, u64 val),
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+ TP_PROTO(int type, int len, u64 gpa, void *val),
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TP_ARGS(type, len, gpa, val),
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TP_STRUCT__entry(
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@@ -225,7 +225,9 @@ TRACE_EVENT(kvm_mmio,
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__entry->type = type;
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__entry->len = len;
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__entry->gpa = gpa;
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- __entry->val = val;
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+ __entry->val = 0;
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+ if (val)
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+ memcpy(&__entry->val, val, min(8, len));
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),
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TP_printk("mmio %s len %u gpa 0x%llx val 0x%llx",
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diff --git a/virt/kvm/arm/mmio.c b/virt/kvm/arm/mmio.c
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index b6e715f..dac7ceb 100644
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--- a/virt/kvm/arm/mmio.c
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+++ b/virt/kvm/arm/mmio.c
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@@ -112,7 +112,7 @@ int kvm_handle_mmio_return(struct kvm_vcpu *vcpu, struct kvm_run *run)
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}
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trace_kvm_mmio(KVM_TRACE_MMIO_READ, len, run->mmio.phys_addr,
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- data);
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+ &data);
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data = vcpu_data_host_to_guest(vcpu, data, len);
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vcpu_set_reg(vcpu, vcpu->arch.mmio_decode.rt, data);
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}
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@@ -182,14 +182,14 @@ int io_mem_abort(struct kvm_vcpu *vcpu, struct kvm_run *run,
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data = vcpu_data_guest_to_host(vcpu, vcpu_get_reg(vcpu, rt),
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len);
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- trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, len, fault_ipa, data);
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+ trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, len, fault_ipa, &data);
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kvm_mmio_write_buf(data_buf, len, data);
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ret = kvm_io_bus_write(vcpu, KVM_MMIO_BUS, fault_ipa, len,
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data_buf);
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} else {
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trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, len,
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- fault_ipa, 0);
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+ fault_ipa, NULL);
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ret = kvm_io_bus_read(vcpu, KVM_MMIO_BUS, fault_ipa, len,
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data_buf);
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From patchwork Mon Dec 18 11:55:05 2017
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Content-Type: text/plain; charset="utf-8"
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MIME-Version: 1.0
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Content-Transfer-Encoding: 7bit
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Subject: [v4] KVM: Fix stack-out-of-bounds read in write_mmio
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From: Paolo Bonzini <pbonzini@redhat.com>
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X-Patchwork-Id: 10118879
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Message-Id: <17d27b8d-908b-a740-1d2d-e92a8507f25b@redhat.com>
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To: Marc Zyngier <marc.zyngier@arm.com>,
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Wanpeng Li <kernellwp@gmail.com>, linux-kernel@vger.kernel.org,
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kvm@vger.kernel.org
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Cc: =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= <rkrcmar@redhat.com>,
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Wanpeng Li <wanpeng.li@hotmail.com>,
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Christoffer Dall <christoffer.dall@linaro.org>
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Date: Mon, 18 Dec 2017 12:55:05 +0100
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On 15/12/2017 12:06, Marc Zyngier wrote:
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> Assuming you address the above:
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>
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> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
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> Tested-by: Marc Zyngier <marc.zyngier@arm.com>
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Done as follows:
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Thanks,
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Paolo
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diff --git a/include/trace/events/kvm.h b/include/trace/events/kvm.h
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index dfd21708694f..0a016bd14c2d 100644
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--- a/include/trace/events/kvm.h
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+++ b/include/trace/events/kvm.h
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@@ -227,7 +227,8 @@
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__entry->gpa = gpa;
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__entry->val = 0;
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if (val)
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- memcpy(&__entry->val, val, min(8, len));
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+ memcpy(&__entry->val, val,
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+ min_t(u32, sizeof(__entry->val), len));
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),
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TP_printk("mmio %s len %u gpa 0x%llx val 0x%llx",
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