Date: Thu, 6 Aug 2020 16:20:21 +0000 (UTC) From: Brooks Davis <brooks@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r363966 - head/sys/vm Message-ID: <202008061620.076GKLoa047657@repo.freebsd.org>
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Author: brooks Date: Thu Aug 6 16:20:20 2020 New Revision: 363966 URL: https://svnweb.freebsd.org/changeset/base/363966 Log: Preserve ASLR vm_map flags across fork In the most common case (fork+execve) this doesn't matter, but further attempts to apply entropy would fail in (e.g.) a pre-fork server. Reported by: Alfredo Mazzinghi Reviewed by: kib, markj Obtained from: CheriBSD MFC after: 3 days Differential Revision: https://reviews.freebsd.org/D25966 Modified: head/sys/vm/vm_map.c Modified: head/sys/vm/vm_map.c ============================================================================== --- head/sys/vm/vm_map.c Thu Aug 6 16:14:43 2020 (r363965) +++ head/sys/vm/vm_map.c Thu Aug 6 16:20:20 2020 (r363966) @@ -4109,6 +4109,7 @@ vmspace_fork(struct vmspace *vm1, vm_ooffset_t *fork_c } new_map->anon_loc = old_map->anon_loc; + new_map->flags |= old_map->flags & (MAP_ASLR | MAP_ASLR_IGNSTART); VM_MAP_ENTRY_FOREACH(old_entry, old_map) { if ((old_entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0)
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