Date: Mon, 14 Nov 2016 18:30:03 +0000 (UTC) From: Ruslan Bukin <br@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r308644 - head/sys/riscv/riscv Message-ID: <201611141830.uAEIU35P020976@repo.freebsd.org>
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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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