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| author | Christian Krinitsin <mail@krinitsin.com> | 2025-06-05 14:16:30 +0000 |
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| committer | Christian Krinitsin <mail@krinitsin.com> | 2025-06-05 14:16:30 +0000 |
| commit | 140a79ffee69434ba0fbfde4cefb9fe5e82d93b4 (patch) | |
| tree | 6b9607b2cea6e5fdf90e8964ea1affed408314ca /results/classifier/010/semantic/gitlab_semantic_bextr | |
| parent | ee1d992c43e7c9b321bdb14e9a8d15371d9bfda7 (diff) | |
| download | qemu-analysis-140a79ffee69434ba0fbfde4cefb9fe5e82d93b4.tar.gz qemu-analysis-140a79ffee69434ba0fbfde4cefb9fe5e82d93b4.zip | |
add results
Diffstat (limited to 'results/classifier/010/semantic/gitlab_semantic_bextr')
| -rw-r--r-- | results/classifier/010/semantic/gitlab_semantic_bextr | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/results/classifier/010/semantic/gitlab_semantic_bextr b/results/classifier/010/semantic/gitlab_semantic_bextr new file mode 100644 index 000000000..ff13d5385 --- /dev/null +++ b/results/classifier/010/semantic/gitlab_semantic_bextr @@ -0,0 +1,54 @@ +semantic: 0.993 +graphic: 0.790 +device: 0.717 +debug: 0.603 +boot: 0.516 +vnc: 0.471 +socket: 0.397 +PID: 0.234 +performance: 0.233 +network: 0.219 +permissions: 0.188 +other: 0.099 +files: 0.099 +KVM: 0.091 +semantic: 0.982 +debug: 0.687 +other: 0.037 +files: 0.029 +performance: 0.017 +PID: 0.008 +device: 0.007 +network: 0.006 +permissions: 0.002 +socket: 0.002 +KVM: 0.002 +graphic: 0.002 +boot: 0.002 +vnc: 0.001 + +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. |