diff options
Diffstat (limited to 'results/classifier/011/semantic/gitlab_semantic_bextr')
| -rw-r--r-- | results/classifier/011/semantic/gitlab_semantic_bextr | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/results/classifier/011/semantic/gitlab_semantic_bextr b/results/classifier/011/semantic/gitlab_semantic_bextr new file mode 100644 index 000000000..ae41ff1b0 --- /dev/null +++ b/results/classifier/011/semantic/gitlab_semantic_bextr @@ -0,0 +1,54 @@ +semantic: 0.694 +graphic: 0.050 +device: 0.049 +debug: 0.048 +other: 0.028 +permissions: 0.024 +vnc: 0.021 +boot: 0.016 +PID: 0.015 +performance: 0.014 +socket: 0.014 +files: 0.013 +network: 0.010 +KVM: 0.005 +semantic: 0.759 +debug: 0.145 +other: 0.020 +files: 0.017 +performance: 0.012 +PID: 0.009 +device: 0.008 +network: 0.007 +permissions: 0.004 +socket: 0.004 +KVM: 0.004 +graphic: 0.004 +boot: 0.004 +vnc: 0.003 + +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 + +Compile this code + +void main() { + asm("mov rax, 0x17b3693f77fb6e9"); + asm("mov rbx, 0x8f635a775ad3b9b4"); + asm("mov rcx, 0xb717b75da9983018"); + asm("bextr eax, ebx, ecx"); +} + +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. |