blob: 0db6a019873ce94bb004add15e688e7cbb1f51ab (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
semantic: 0.993
instruction: 0.952
graphic: 0.807
device: 0.700
assembly: 0.661
boot: 0.382
vnc: 0.341
socket: 0.314
network: 0.272
mistranslation: 0.272
other: 0.093
KVM: 0.044
x86 BZHI semantic bug
Description of problem:
The result of instruction BZHI is different from the CPU. The value of destination register and SF of EFLAGS are different.
Steps to reproduce:
1. Compile this code
```
void main() {
asm("mov rax, 0xb1aa9da2fe33fe3");
asm("mov rbx, 0x80000000ffffffff");
asm("mov rcx, 0xf3fce8829b99a5c6");
asm("bzhi rax, rbx, rcx");
}
```
2. Execute and compare the result with the CPU.
- CPU
- RAX = 0x0x80000000ffffffff
- SF = 1
- QEMU
- RAX = 0xffffffff
- SF = 0
Additional information:
This bug is discovered by research conducted by KAIST SoftSec.
|