Searched hist:319203 (Results 1 - 2 of 2) sorted by relevance
| /freebsd-11-stable/sys/arm64/include/ | ||
| H A D | pte.h | diff 319203 Tue May 30 12:56:55 MDT 2017 andrew MFC r316734, r316761: Support Execute-Never bit in the arm64 pmap. r316734: Start to use the User and Privileged execute-never bits in the arm64 pagetables. This sets both bits when entering an address we know shouldn't be executed. I expect we could mark all userspace pages as Privileged execute-never to ensure the kernel doesn't branch to one of these addresses. While here add the ARMv8.1 upper attributes. r316761: Set the arm64 Execute-never bits in more places. We need to set the Execute-never bits when mapping device memory as the hardware may perform speculative instruction fetches. Set the Privileged Execute-ever bit on userspace memory to stop the kernel if it is tricked into executing it. |
| /freebsd-11-stable/sys/arm64/arm64/ | ||
| H A D | pmap.c | diff 319203 Tue May 30 12:56:55 MDT 2017 andrew MFC r316734, r316761: Support Execute-Never bit in the arm64 pmap. r316734: Start to use the User and Privileged execute-never bits in the arm64 pagetables. This sets both bits when entering an address we know shouldn't be executed. I expect we could mark all userspace pages as Privileged execute-never to ensure the kernel doesn't branch to one of these addresses. While here add the ARMv8.1 upper attributes. r316761: Set the arm64 Execute-never bits in more places. We need to set the Execute-never bits when mapping device memory as the hardware may perform speculative instruction fetches. Set the Privileged Execute-ever bit on userspace memory to stop the kernel if it is tricked into executing it. |
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