lock user-mode and semantic-bugs

1 files changed, 13 insertions, 0 deletions

diff --git a/results/classifier/user-mode-bugs/1095857 b/results/classifier/user-mode-bugs/1095857
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+
+
+incorrect handling of [r32] address (long mode)
+
+while executing in Long Mode (x86-64) instructions such as
+
+mov eax,[r15d]
+
+end up executing as
+
+mov eax,[r15]
+
+according to x86 programmer manuals the behavior of using the Address-Size override (in long mode) is supposed to ignore the high 32bits of the register. I use this fact in my operating system to reduce register usage (the high 32 bits of r15 holds other data). consequently a general protection exception occurs since the memory address isn't "canonical". this error doesn't always appear since the high 32 bits might not be zero in those conditions.
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