The kernel in FreeBSD 6.3 up to and including 7.0 on amd64 platforms can make an extra swapgs call after a General Protection Fault (GPF), which allows local users to gain privileges by triggering a GPF during the kernel's return from (1) an interrupt, (2) a trap, or (3) a system call.
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freebsd freebsd 6.3 |
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freebsd freebsd 7.0 |