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| author | Christian Krinitsin <mail@krinitsin.com> | 2025-06-03 14:41:43 +0200 |
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| committer | Christian Krinitsin <mail@krinitsin.com> | 2025-06-03 14:41:43 +0200 |
| commit | d760c82f4244dc47f5413c3c88b640bb1f0f2d9e (patch) | |
| tree | ba963e9c548a5f19da2665005ce85946c601cd36 /results/scraper/gitlab/semantic_issues/gitlab_semantic_bextr | |
| parent | 256709d2eb3fd80d768a99964be5caa61effa2a0 (diff) | |
| download | emulator-bug-study-d760c82f4244dc47f5413c3c88b640bb1f0f2d9e.tar.gz emulator-bug-study-d760c82f4244dc47f5413c3c88b640bb1f0f2d9e.zip | |
move semantic_issues dir to results
Diffstat (limited to 'results/scraper/gitlab/semantic_issues/gitlab_semantic_bextr')
| -rw-r--r-- | results/scraper/gitlab/semantic_issues/gitlab_semantic_bextr | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/results/scraper/gitlab/semantic_issues/gitlab_semantic_bextr b/results/scraper/gitlab/semantic_issues/gitlab_semantic_bextr new file mode 100644 index 00000000..dabe16ac --- /dev/null +++ b/results/scraper/gitlab/semantic_issues/gitlab_semantic_bextr @@ -0,0 +1,25 @@ +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. |