K 10
svn:author
V 6
kevans
K 8
svn:date
V 27
2020-01-05T03:15:16.746183Z
K 7
svn:log
V 429
shmfd/mmap: restrict maxprot with MAP_SHARED + F_SEAL_WRITE

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

END