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Index: head/sys/kern/uipc_shm.c
===================================================================
--- head/sys/kern/uipc_shm.c
+++ head/sys/kern/uipc_shm.c
@@ -1116,7 +1116,13 @@
/* FREAD should always be set. */
if ((fp->f_flag & FREAD) != 0)
maxprot |= VM_PROT_EXECUTE | VM_PROT_READ;
- if ((fp->f_flag & FWRITE) != 0)
+
+ /*
+ * If FWRITE's set, we can allow VM_PROT_WRITE unless it's a shared
+ * mapping with a write seal applied.
+ */
+ if ((fp->f_flag & FWRITE) != 0 && ((flags & MAP_SHARED) == 0 ||
+ (shmfd->shm_seals & F_SEAL_WRITE) == 0))
maxprot |= VM_PROT_WRITE;
writecnt = (flags & MAP_SHARED) != 0 && (prot & VM_PROT_WRITE) != 0;

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