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Kyle Evans authored
If a write seal is set on a shared mapping, we must exclude VM_PROT_WRITE as the fd is effectively read-only. This was discovered by running devel/linux-ltp, which mmap's with acceptable protections specified then attempts to raise to PROT_READ|PROT_WRITE with mprotect(2), which we allowed. Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D22978
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