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| author | Christian Krinitsin <mail@krinitsin.com> | 2025-07-05 20:00:38 +0200 |
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| committer | Christian Krinitsin <mail@krinitsin.com> | 2025-07-05 20:00:38 +0200 |
| commit | 96049c939b1916d80532630d63c14e04d5244f1d (patch) | |
| tree | 7fb9df428f074078e714f1e038210cdff887185a /results/classifier/user-mode-bugs/1372 | |
| parent | 40bbb77d4dfebff4f99c2f90b2c0db737b0ecc5a (diff) | |
| download | qemu-analysis-96049c939b1916d80532630d63c14e04d5244f1d.tar.gz qemu-analysis-96049c939b1916d80532630d63c14e04d5244f1d.zip | |
lock user-mode and semantic-bugs
Diffstat (limited to 'results/classifier/user-mode-bugs/1372')
| -rw-r--r-- | results/classifier/user-mode-bugs/1372 | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/results/classifier/user-mode-bugs/1372 b/results/classifier/user-mode-bugs/1372 new file mode 100644 index 000000000..44615f89a --- /dev/null +++ b/results/classifier/user-mode-bugs/1372 @@ -0,0 +1,22 @@ + + +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: +1. Compile this code +``` +void main() { + asm("mov rax, 0x17b3693f77fb6e9"); + asm("mov rbx, 0x8f635a775ad3b9b4"); + asm("mov rcx, 0xb717b75da9983018"); + asm("bextr eax, ebx, ecx"); +} +``` +2. 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. |