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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/1376 | |
| 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/1376')
| -rw-r--r-- | results/classifier/user-mode-bugs/1376 | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/results/classifier/user-mode-bugs/1376 b/results/classifier/user-mode-bugs/1376 new file mode 100644 index 000000000..9d2743a7f --- /dev/null +++ b/results/classifier/user-mode-bugs/1376 @@ -0,0 +1,17 @@ + + +x86 LSL and LAR fault +Description of problem: +From the description of LSL and LAR instructions in manual, `If the segment descriptor cannot be accessed or is an invalid type for the instruction, the ZF flag is cleared and no value is loaded in the destination operand.`. When it happens at the CPU, it seems they do nothing (nop). However, in QEMU, it crashes. +Steps to reproduce: +1. Compile this code +``` +void main() { + asm("mov rax, 0xa02e698e741f5a6a"); + asm("mov rbx, 0x20959ddd7a0aef"); + asm("lsl ax, bx"); +} +``` +2. Execute. QEMU crashes but CPU does not. This problem happens with LAR, too. +Additional information: +This bug is discovered by research conducted by KAIST SoftSec. |