Date: Tue, 7 Aug 2018 17:45:50 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r337429 - stable/11/sys/vm Message-ID: <201808071745.w77Hjoc4061987@repo.freebsd.org>
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Author: kib Date: Tue Aug 7 17:45:49 2018 New Revision: 337429 URL: https://svnweb.freebsd.org/changeset/base/337429 Log: MFC r336987: For compat32, emulate the same wraparound check as occurs on the real ILP32 system. PR: 230162 Modified: stable/11/sys/vm/vm_mmap.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/vm/vm_mmap.c ============================================================================== --- stable/11/sys/vm/vm_mmap.c Tue Aug 7 17:44:36 2018 (r337428) +++ stable/11/sys/vm/vm_mmap.c Tue Aug 7 17:45:49 2018 (r337429) @@ -596,6 +596,12 @@ kern_mprotect(struct thread *td, uintptr_t addr0, size addr -= pageoff; size += pageoff; size = (vm_size_t) round_page(size); +#ifdef COMPAT_FREEBSD32 + if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { + if (((addr + size) & 0xffffffff) < addr) + return (EINVAL); + } else +#endif if (addr + size < addr) return (EINVAL);
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