Author: br
Date: Mon Nov 14 18:30:03 2016
New Revision: 308644
URL: https://svnweb.freebsd.org/changeset/base/308644
Log:
Check if L2 entry exists for the given VA before loading L3 entry.
This is a fix for a panic that was easy to reproduce executing
"(/bin/ls &)" in the shell.
Sponsored by: DARPA, AFRL
Modified:
head/sys/riscv/riscv/pmap.c
Modified: head/sys/riscv/riscv/pmap.c
==============================================================================
--- head/sys/riscv/riscv/pmap.c Mon Nov 14 17:19:03 2016 (r308643)
+++ head/sys/riscv/riscv/pmap.c Mon Nov 14 18:30:03 2016 (r308644)
@@ -1992,6 +1992,8 @@ pmap_protect(pmap_t pmap, vm_offset_t sv
l2 = pmap_l1_to_l2(l1, sva);
if (l2 == NULL)
continue;
+ if (pmap_load(l2) == 0)
+ continue;
if ((pmap_load(l2) & PTE_RX) != 0)
continue;
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