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authorChristian Krinitsin <mail@krinitsin.com>2025-06-01 21:19:55 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-06-01 21:19:55 +0200
commite5634e2806195bee44407853c4bf8776f7abfa4f (patch)
tree6c6e2503f2cd56c0edf08a55d5c8fcb3832fabd0 /classification_output/01/semantic/gitlab_semantic_bextr
parent05ed9b00104b3da2e9cb0d541b5c5bbceb027fde (diff)
downloadqemu-analysis-e5634e2806195bee44407853c4bf8776f7abfa4f.tar.gz
qemu-analysis-e5634e2806195bee44407853c4bf8776f7abfa4f.zip
add the outputs of the first five revisions of the classifier
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+semantic: 0.993
+instruction: 0.944
+mistranslation: 0.337
+other: 0.099
+
+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.