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authorChristian Krinitsin <mail@krinitsin.com>2025-06-04 20:55:58 +0000
committerChristian Krinitsin <mail@krinitsin.com>2025-06-04 20:55:58 +0000
commit45cde517004371146f7533c59c8005b8b2629291 (patch)
tree94d550cdbb053c271101d9cc07e5dddc0a0c7edb /results/classifier/007/semantic/gitlab_semantic_bzhi
parent0ffbcc8b5f9f084a14fa6e4b93095758b63c465d (diff)
downloadqemu-analysis-45cde517004371146f7533c59c8005b8b2629291.tar.gz
qemu-analysis-45cde517004371146f7533c59c8005b8b2629291.zip
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+semantic: 0.920
+graphic: 0.652
+device: 0.589
+vnc: 0.287
+debug: 0.256
+boot: 0.220
+network: 0.203
+socket: 0.198
+performance: 0.165
+PID: 0.130
+permissions: 0.069
+other: 0.064
+KVM: 0.064
+files: 0.051
+
+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
+
+Compile this code
+
+
+void main() {
+    asm("mov rax, 0xb1aa9da2fe33fe3");
+    asm("mov rbx, 0x80000000ffffffff");
+    asm("mov rcx, 0xf3fce8829b99a5c6");
+    asm("bzhi rax, rbx, rcx");
+}
+
+
+
+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.