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authorChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
commitdee4dcba78baf712cab403d47d9db319ab7f95d6 (patch)
tree418478faf06786701a56268672f73d6b0b4eb239 /results/classifier/108/semantic/1375
parent4d9e26c0333abd39bdbd039dcdb30ed429c475ba (diff)
downloademulator-bug-study-dee4dcba78baf712cab403d47d9db319ab7f95d6.tar.gz
emulator-bug-study-dee4dcba78baf712cab403d47d9db319ab7f95d6.zip
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-semantic: 0.988
-graphic: 0.792
-device: 0.739
-other: 0.687
-performance: 0.586
-vnc: 0.520
-permissions: 0.509
-debug: 0.468
-network: 0.458
-boot: 0.413
-socket: 0.407
-PID: 0.343
-KVM: 0.247
-files: 0.241
-
-x86 SSE/SSE2/SSE3 instruction semantic bugs with NaN
-Description of problem:
-The result of SSE/SSE2/SSE3 instructions with NaN is different from the CPU. From Intel manual Volume 1 Appendix D.4.2.2, they defined the behavior of such instructions with NaN. But I think QEMU did not implement this semantic exactly because the byte result is different.
-Steps to reproduce:
-1. Compile this code
-```
-void main() {
- asm("mov rax, 0x000000007fffffff; push rax; mov rax, 0x00000000ffffffff; push rax; movdqu XMM1, [rsp];");
- asm("mov rax, 0x2e711de7aa46af1a; push rax; mov rax, 0x7fffffff7fffffff; push rax; movdqu XMM2, [rsp];");
- asm("addsubps xmm1, xmm2");
-}
-```
-2. Execute and compare the result with the CPU. This problem happens with other SSE/SSE2/SSE3 instructions specified in the manual, Volume 1 Appendix D.4.2.2.
- - CPU
- - xmm1[3] = 0xffffffff
- - QEMU
- - xmm1[3] = 0x7fffffff
-Additional information:
-This bug is discovered by research conducted by KAIST SoftSec.