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| author | Christian Krinitsin <mail@krinitsin.com> | 2025-05-30 15:56:20 +0200 |
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| committer | Christian Krinitsin <mail@krinitsin.com> | 2025-05-30 15:56:20 +0200 |
| commit | 904141bfb8d5385b75eb3b7afec1dcda89af65a7 (patch) | |
| tree | c8b5e69b944c9f8b96dbb5afad6214d0406537b2 /classification/test_input/gitlab_semantic_bextr | |
| parent | 712310482c3dbef91c3eb6458d1bff82a275fa52 (diff) | |
| download | qemu-analysis-904141bfb8d5385b75eb3b7afec1dcda89af65a7.tar.gz qemu-analysis-904141bfb8d5385b75eb3b7afec1dcda89af65a7.zip | |
add tests and include results
Diffstat (limited to 'classification/test_input/gitlab_semantic_bextr')
| -rw-r--r-- | classification/test_input/gitlab_semantic_bextr | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/classification/test_input/gitlab_semantic_bextr b/classification/test_input/gitlab_semantic_bextr new file mode 100644 index 000000000..dabe16acf --- /dev/null +++ b/classification/test_input/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. |