diff options
Diffstat (limited to 'results/classifier/zero-shot-user-mode/instruction/1372')
| -rw-r--r-- | results/classifier/zero-shot-user-mode/instruction/1372 | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/results/classifier/zero-shot-user-mode/instruction/1372 b/results/classifier/zero-shot-user-mode/instruction/1372 new file mode 100644 index 000000000..bb22b6c3e --- /dev/null +++ b/results/classifier/zero-shot-user-mode/instruction/1372 @@ -0,0 +1,26 @@ +instruction: 0.835 +runtime: 0.112 +syscall: 0.053 + + + +x86 BEXTR semantic bug +Description of problem: +The result of instruction BEXTR is different with from the CPU. The value of destination register is different. I think QEMU does not consider the operand size limit. +Steps to reproduce: +1. Compile this code +``` +void main() { + asm("mov rax, 0x17b3693f77fb6e9"); + asm("mov rbx, 0x8f635a775ad3b9b4"); + asm("mov rcx, 0xb717b75da9983018"); + asm("bextr eax, ebx, ecx"); +} +``` +2. Execute and compare the result with the CPU. + - CPU + - RAX = 0x5a + - QEMU + - RAX = 0x635a775a +Additional information: +This bug is discovered by research conducted by KAIST SoftSec. |