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If %ss is loaded with a segment pointing to a non-present descriptor by the IRETD instruction, a kernel-mode #SS exception is generated. Resulting T_STKFLT trap must be checked against doreti_iret_fault location and handled, otherwise userspace may panic the kernel. Note that this is i386 variant of FreeBSD-SA-15:21.amd64, but unlike amd64, there is no swapgs on i386 and the issue is arguably not exploitable. Reported by: Maxime Villard <max@m00nbsd.net> Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week |
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acpica | ||
bios | ||
cloudabi32 | ||
conf | ||
i386 | ||
ibcs2 | ||
include | ||
isa | ||
linux | ||
pci | ||
xbox | ||
Makefile |